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CN120511162A - On-load tap-changer transition circuit and voltage regulating method - Google Patents

On-load tap-changer transition circuit and voltage regulating method

Info

Publication number
CN120511162A
CN120511162A CN202510610350.8A CN202510610350A CN120511162A CN 120511162 A CN120511162 A CN 120511162A CN 202510610350 A CN202510610350 A CN 202510610350A CN 120511162 A CN120511162 A CN 120511162A
Authority
CN
China
Prior art keywords
switching element
state
main contact
tap
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202510610350.8A
Other languages
Chinese (zh)
Inventor
曹燕明
董弘川
武炬臻
王楠
贺康航
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Economic and Technological Research Institute Co Ltd
Original Assignee
State Grid Economic and Technological Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Economic and Technological Research Institute Co Ltd filed Critical State Grid Economic and Technological Research Institute Co Ltd
Priority to CN202510610350.8A priority Critical patent/CN120511162A/en
Publication of CN120511162A publication Critical patent/CN120511162A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0016—Contact arrangements for tap changers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0038—Tap change devices making use of vacuum switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/52—Cooling of switch parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Keying Circuit Devices (AREA)

Abstract

The invention discloses a transition circuit and a voltage regulating method of an on-load tap changer, wherein a first tap position of a transformer voltage regulating winding of the transition circuit is respectively connected with a first main contact, a first transition resistor and a first moving contact of a change-over switch, a second tap position of the transformer voltage regulating winding is respectively connected with a second transition resistor, a first switching element and a second main contact, the other end of the first transition resistor is connected with one end of the second switching element, one end of a third switching element is respectively connected with the first switching element and the change-over switch, the other end of the second transition resistor is connected with the second moving contact of the change-over switch, and the other ends of the first main contact, the second switching element and the third switching element are all connected with a neutral point leading-out end of the on-load tap changer. According to the on-load tap-changer transition circuit and the voltage regulating method provided by the embodiment of the invention, the vacuum contacts take charge of the switching task in turn, so that the fault probability is reduced, and the safety of a power system is improved.

Description

On-load tap-changer transition circuit and voltage regulating method
Technical Field
The invention relates to the technical field of power systems, in particular to an on-load tap-changer transition circuit and a voltage regulating method.
Background
The on-load tap-changer is a key component in the power transformer, can be operated in a transformer excitation or load state, and can change a plurality of taps led out from a transformer winding to change the effective turns ratio, so as to realize the regulation of output voltage without interrupting load current. The topology of the transition circuit, which serves as the core of the on-load tap changer, directly affects the reliability, failure rate and electrical life of the switching process.
However, the existing on-load tap-changer transition circuit is unreasonable in design, so that electric arcs are easy to generate when mechanical contacts are separated and closed under the condition of high voltage or high current, and the mechanical contacts and switching elements are easy to wear in frequent switching, so that the safety of a power system is seriously affected.
Therefore, how to optimally design the on-load tap-changer transition circuit to improve the safety of the power system has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides an on-load tap-changer transition circuit and a voltage regulating method, which are used for solving the technical problems that the existing on-load tap-changer transition circuit is unreasonable in design, electric arcs are easy to generate when mechanical contacts are separated and closed under the condition of high voltage or high current, and mechanical contacts and switching elements are easy to wear in frequent switching, so that the safety of a power system is seriously affected.
In order to solve the technical problems, an embodiment of the present invention provides an on-load tap-changer transition circuit, which includes a first main contact, a second main contact, a first switching element, a second switching element, a third switching element, a transfer switch, a first transition resistor and a second transition resistor;
The first tapping gear of the transformer voltage regulating winding is respectively connected with the first main contact, the first transition resistor and the first moving contact of the change-over switch; the second branch gear of the voltage regulating winding of the transformer is respectively connected with the second transition resistor, the first switching element and the second main contact;
The other end of the first transition resistor is connected with one end of the second switching element, and one end of the third switching element is respectively connected with the first switching element and the change-over switch;
The other ends of the first main contact, the second switching element and the third switching element are all connected with a neutral point leading-out end of the on-load tap-changer.
As one preferable scheme, when the first main contact, the third switch element and the second switch element are in a conducting state, the first switch element and the second switch element are in a disconnecting state, and the change-over switch is conducted with the first moving contact, a tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the first main contact;
when the second main contact, the first switch element and the third switch element are in a conducting state, the first main contact and the second switch element are in a disconnecting state, and the change-over switch is conducted with the second movable contact, a tapping selector of the on-load tapping switch is connected with the second tapping gear, and load current flows out from the neutral point leading-out end through the second main contact.
As one preferable scheme, when the first main contact, the second main contact and the first switch element are in an off state, the second switch element and the third switch element are in an on state, and the change-over switch is conducted with the first moving contact, a tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the change-over switch and the third switch element in sequence;
When the first switch element and the third switch element are in a conducting state, the first main contact, the second main contact and the second switch element are in a disconnecting state, and the change-over switch is conducted with the second moving contact, a tapping selector of the on-load tapping switch is connected with the second tapping gear, and load current flows out from the neutral point leading-out end through the first switch element and the third switch element in sequence.
As one preferable scheme, when the first main contact, the second main contact, the first switching element and the third switching element are all in an off state, the second switching element is in an off state, and the change-over switch is conducted with the first moving contact, a tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the first transition resistor and the second switching element in sequence;
when the third switch element is in a conducting state, the first main contact, the second main contact, the first switch element and the second switch element are all in a disconnecting state, and when the change-over switch is conducted with the second moving contact, a tapping selector of the on-load tapping switch is connected with the second tapping gear, and load current flows out from the neutral point leading-out end through the second transition resistor and the third switch element in sequence.
As one preferable scheme, when the first main contact, the second main contact, the first switching element and the third switching element are all in an off state, the second switching element is in an on state, and the change-over switch is conducted with the second moving contact, a tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the first transition resistor and the second switching element in sequence;
When the second switch element and the third switch element are in a conducting state, the first main contact, the second main contact and the first switch element are in a disconnecting state, and the change-over switch is conducted with the second movable contact, a tapping selector of the on-load tapping switch is respectively connected with the first tapping gear and the second tapping gear, and load current flows out from the neutral point leading-out end through a first passage and a second passage respectively, wherein the first passage sequentially passes through the first transition resistor and the second switch element, and the second passage sequentially passes through the second transition resistor, the change-over switch and the third switch element.
As one preferable scheme, when the first main contact, the second main contact and the first switch element are in an off state, the second switch element and the third switch element are in an on state, and the change-over switch is conducted with the second moving contact, a tapping selector of the on-load tapping switch is respectively connected with the first tapping gear and the second tapping gear, and load current flows out of the neutral point leading-out end through a first passage and a second passage respectively, wherein the first passage sequentially passes through the first transition resistor and the second switch element, and the second passage sequentially passes through the second transition resistor, the change-over switch and the third switch element;
when the first main contact, the second main contact, the first switch element and the third switch element are all in an off state, the second switch element is in an on state, and the change-over switch is conducted with the second movable contact, a tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the first transition resistor and the second switch element in sequence.
As one preferable scheme, when the first main contact, the second main contact, the first switch element and the second switch element are all in an off state, the third switch element is in an on state, and the change-over switch is conducted with the second moving contact, a tapping selector of the on-load tapping switch is connected with the second tapping gear, and load current flows out from the neutral point leading-out end through the second transition resistor, the change-over switch and the third switch element in sequence;
when the first main contact, the second main contact, the first switch element and the third switch element are all in an off state, the second switch element is in an on state, and the change-over switch is conducted with the first moving contact, a tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the first transition resistor and the second switch element in sequence.
As one preferable scheme, when the first main contact, the second main contact and the second switch element are all in an off state, the first switch element and the third switch element are all in an on state, and the change-over switch is conducted with the second movable contact, a tapping selector of the on-load tapping switch is connected with the second tapping gear, and load current sequentially flows out from the neutral point leading-out end through the first switch element and the third switch element;
When the first main contact, the second main contact and the first switch element are in an off state, the second switch element and the third switch element are in an on state, and the change-over switch is conducted with the first moving contact, a tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the change-over switch and the third switch element in sequence.
As one preferable scheme, when the first main contact and the second switch element are in an off state, the first switch element, the second main contact and the third switch element are in an on state, and the change-over switch is conducted with the second movable contact, a tapping selector of the on-load tapping switch is connected with the second tapping gear, and load current flows out from the neutral point leading-out end through the second main contact;
When the first switch element and the second main contact are in an off state, the first main contact, the second switch element and the third switch element are in an on state, and the change-over switch is conducted with the first movable contact, a tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the first main contact.
Still another embodiment of the present invention provides a voltage regulation method for an on-load tap-changer, which is applied to a transition circuit of an on-load tap-changer as described above, and includes:
When the transition circuit is in a first tapping state, a first main contact is disconnected and a third switch element is disconnected in sequence, a control change-over switch is disconnected from a first moving contact and is connected with a second moving contact, the third switch element is disconnected, the second switch element is disconnected, the first switch element is connected, the second main contact is connected, so that the on-load tapping switch is switched from a first tapping gear to a second tapping gear, wherein the first tapping state is that the first main contact, the third switch element and the second switch element are all in a conducting state, the first switch element and the second main contact are all in a disconnecting state, and the change-over switch is connected with the first moving contact;
When the transition circuit is in a second tapping position, the first switch element is turned off, the second switch element is turned on, the third switch element is turned off, the control change-over switch is turned off from the second moving contact and is turned on from the first moving contact, the third switch element is turned on, and the first main contact is turned on in turn, so that the on-load tapping switch is switched from the second tapping position to the first tapping position, wherein the second tapping position is that the first main contact and the second switch element are both in an off state, the first switch element, the second main contact and the third switch element are both in an on state, and the change-over switch is turned on from the second moving contact.
Compared with the prior art, the embodiment of the invention has the beneficial effects that at least one of the following points is adopted:
When the transition circuit is in a first tapping state, the first main contact is disconnected and the third switching element is disconnected in sequence; the control change-over switch is disconnected with the first moving contact and is conducted with the second moving contact; sequentially switching on the third switching element, switching off the second switching element, switching on the first switching element and switching on the second main contact, so that the on-load tap changer is switched from the first tap position to the second tap position; wherein the first tapping state is that the first main contact, the third switching element and the second switching element are all in the conducting state, the first switching element and the second main contact are all in the disconnecting state, the change-over switch is conducted with the first moving contact, when the transition circuit is in the second tapping state, the first switching element is sequentially disconnected, the second switching element is conducted, the third switching element is disconnected, the change-over switch is controlled to be disconnected with the second moving contact and to be conducted with the first moving contact, the third switching element is sequentially conducted, the first main contact is conducted, so that the on-load tapping switch is switched from the second tapping gear to the first tapping gear, wherein the second tapping state is that the first main contact and the second switching element are in the disconnecting state, the switching task is alternately born by the vacuum contacts, the excessive abrasion of a single contact is avoided, the safety of the power system is improved, the service life of the equipment is prolonged, the use of two transition resistance currents is reduced, the heating value of a single resistor is reduced, the time for arc burning in the vacuum contacts is provided, the arc process is reduced, the damage to the contacts is reduced, the contact is gradually reduced, the abrupt change of the arc current and the switching system is avoided, the abrupt change of the voltage is ensured, the switching system is stable, the safety of the power system is further improved.
Drawings
Fig. 1 to 8 are schematic diagrams illustrating a positive sequence switching process of an on-load tap-changer transition circuit from a first tap-changer state to a second tap-changer state according to one embodiment of the invention;
FIG. 9 is a schematic diagram of a switching element of an on-load tap-changer transition circuit according to one embodiment of the invention;
FIG. 10 is a schematic diagram of a switching element of an on-load tap-changer transition circuit according to one embodiment of the invention as a double-break vacuum contact;
FIG. 11 is a timing diagram illustrating a switch on-off positive sequence switching control for an on-load tap changer voltage regulation method according to one embodiment of the present invention;
Fig. 12 is a timing chart of a switch on-off reverse switching control method of an on-load tap changer according to one embodiment of the invention.
Reference numerals:
The switching device comprises MC1, a first main contact, MC2, a second main contact, V1, a first switching element, V2, a second switching element, V3, a third switching element, T1, a change-over switch, R1, a first transition resistor, R2, a second transition resistor, 11, a first moving contact of the change-over switch T1, 12, a second moving contact of the change-over switch T1, N, a first tapping gear, N+1 and a second tapping gear.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention, and the purpose of these embodiments is to provide a more thorough and complete disclosure of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", "a third", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and the like are used herein for descriptive purposes only and not to indicate or imply that the apparatus or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the description of the present application, it should be noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless defined otherwise. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application, as the particular meaning of the terms described above in the present application will be understood to those of ordinary skill in the art in the detailed description of the application.
An embodiment of the invention provides an on-load tap-changer transition circuit, which comprises a first main contact, a second main contact, a first switching element, a second switching element, a third switching element, a change-over switch, a first transition resistor and a second transition resistor.
The first tapping gear of the transformer voltage regulating winding is respectively connected with a first main contact, a first transition resistor and a first moving contact of a change-over switch, the second tapping gear of the transformer voltage regulating winding is respectively connected with a second transition resistor, a first switching element and a second main contact, the other end of the first transition resistor is connected with one end of the second switching element, one end of a third switching element is respectively connected with the first switching element and the change-over switch, the other end of the second transition resistor is connected with the second moving contact of the change-over switch, and the other ends of the first main contact, the second switching element and the third switching element are all connected with a neutral point leading-out end of the on-load tapping switch.
Specifically, referring to fig. 1 to 8, fig. 1 to 8 are schematic diagrams illustrating a positive sequence switching process of an on-load tap changer transition circuit from a first tap state to a second tap state according to one embodiment of the invention. Wherein, MC1 is first main contact, MC2 is the second main contact, V1 is first switching element, V2 is second switching element, V3 is third switching element, T1 is the change over switch, R1 is first transition resistance, R2 is second transition resistance, 11 is the first moving contact of change over switch T1, 12 is the second moving contact of change over switch T1, N is first tapping gear, N+1 is second tapping gear.
It should be noted that, the on-load tap-changer transition circuit provided by the embodiment has the advantages that the vacuum contacts take on the switching tasks in turn, the fault probability is reduced, two transition resistors are used in the transition circuit, the heating of a single resistor is reduced, and the design and the installation are convenient, and the insulation distance is ensured.
In an embodiment, the positive sequence switching process for switching from the first tap state to the second tap state includes first positive sequence switching process to eighth positive sequence switching process.
When the transition circuit is in a first positive sequence switching process of switching from a first tapping state to a second tapping state, referring to fig. 1, the first main contact, the third switch element and the second switch element are all in on states, the first switch element and the second main contact are all in off states, the transfer switch is conducted with the first moving contact, the tapping selector of the on-load tapping switch is connected with a first tapping gear, and load current flows out from the neutral point leading-out end through the first main contact.
When the transition circuit is in a second positive sequence switching process from the first tapping state to the second tapping state, referring to fig. 2, the first main contact, the second main contact and the first switching element are all in an off state, the second switching element and the third switching element are all in an on state, the transfer switch is conducted with the first moving contact, the tapping selector of the on-load tapping switch is connected with the first tapping gear, and the load current flows out from the neutral point leading-out end through the transfer switch and the third switching element in sequence.
When the transition circuit is in a third positive sequence switching process of switching from the first tapping state to the second tapping state, referring to fig. 3, the first main contact, the second main contact, the first switching element and the third switching element are all in an off state, the second switching element is all in an off state, the transfer switch is conducted with the first moving contact, the tapping selector of the on-load tapping switch is connected with the first tapping gear, and the load current flows out from the neutral point leading-out end through the first transition resistor and the second switching element in sequence.
When the transition circuit is in a fourth positive sequence switching process from the first tapping state to the second tapping state, referring to fig. 4, the first main contact, the second main contact, the first switching element and the third switching element are all in an off state, the second switching element is in an on state, the transfer switch is conducted with the second moving contact, the tapping selector of the on-load tapping switch is connected with the first tapping gear, and the load current flows out from the neutral point leading-out end through the first transition resistor and the second switching element in sequence.
When the transition circuit is in a fifth positive sequence switching process of switching from the first tapping state to the second tapping state, referring to fig. 5, the first main contact, the second main contact and the first switch element are all in an off state, the second switch element and the third switch element are all in an on state, the transfer switch is conducted with the second moving contact, the tapping selector of the on-load tapping switch is respectively connected with the first tapping gear and the second tapping gear, and the load current flows out from the neutral point leading-out end through the first path and the second path respectively, wherein the first path sequentially passes through the first transition resistor and the second switch element, and the second path sequentially passes through the second transition resistor, the transfer switch and the third switch element.
When the transition circuit is in a sixth positive sequence switching process from the first tapping state to the second tapping state, referring to fig. 6, the first main contact, the second main contact, the first switching element and the second switching element are all in an off state, the third switching element is in an on state, the change-over switch is connected with the second moving contact, the tapping selector of the on-load tapping switch is connected with the second tapping position, and the load current flows out from the neutral point leading-out end sequentially through the second transition resistor, the change-over switch and the third switching element.
When the transition circuit is in a seventh positive sequence switching process of switching from the first tapping state to the second tapping state, referring to fig. 7, the first main contact, the second main contact and the second switching element are all in an off state, the first switching element and the third switching element are all in an on state, the transfer switch is conducted with the second moving contact, the tapping selector of the on-load tapping switch is connected with the second tapping position, and the load current flows out from the neutral point leading-out end sequentially through the first switching element and the third switching element.
When the transition circuit is in the eighth positive sequence switching process of switching from the first tapping state to the second tapping state, please refer to fig. 8, the first main contact and the second switch element are in the off state, the first switch element, the second main contact and the third switch element are in the on state, the transfer switch is conducted with the second moving contact, the tapping selector of the on-load tapping switch is connected with the second tapping position, and the load current flows out from the neutral point leading-out end through the second main contact.
In an embodiment, the reverse order switching process from the second tap state to the first tap state includes a first reverse order switching process to an eighth reverse order switching process.
When the transition circuit is in a first reverse sequence switching process of switching from a second tapping state to a first tapping state, the second main contact, the first switching element and the third switching element are in a conducting state, the first main contact and the second switching element are in a disconnecting state, the change-over switch is conducted with the second moving contact, the tapping selector of the on-load tapping switch is connected with a second tapping gear, and load current flows out from a neutral point leading-out end through the second main contact.
When the transition circuit is in a second reverse sequence switching process of switching from a second tapping state to a first tapping state, the first switch element and the third switch element are in a conducting state, the first main contact, the second main contact and the second switch element are in a disconnecting state, the change-over switch is conducted with the second moving contact, the tapping selector of the on-load tapping switch is connected with a second tapping gear, and load current flows out from a neutral point leading-out end through the first switch element and the third switch element in sequence.
When the transition circuit is in a third reverse sequence switching process of switching from the second tapping state to the first tapping state, the third switching element is in a conducting state, the first main contact, the second main contact, the first switching element and the second switching element are all in a disconnecting state, the change-over switch is conducted with the second moving contact, the tapping selector of the on-load tapping switch is connected with the second tapping position, and load current flows out from the neutral point leading-out end through the second transition resistor and the third switching element in sequence.
When the transition circuit is in a fourth reverse sequence switching process of switching from a second tapping state to a first tapping state, the second switch element and the third switch element are in a conducting state, the first main contact, the second main contact and the first switch element are in a disconnecting state, the change-over switch is conducted with the second moving contact, the tapping selector of the on-load tapping switch is respectively connected with a first tapping gear and a second tapping gear, and load current flows out of a neutral point leading-out end through a first passage and a second passage respectively, wherein the first passage sequentially passes through the first transition resistor and the second switch element, and the second passage sequentially passes through the second transition resistor, the change-over switch and the third switch element.
When the transition circuit is in a fifth reverse sequence switching process of switching from the second tapping state to the first tapping state, the first main contact, the second main contact, the first switching element and the third switching element are all in an off state, the second switching element is in an on state, the change-over switch is conducted with the second moving contact, the tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the first transition resistor and the second switching element in sequence.
When the transition circuit is in a sixth reverse sequence switching process of switching from the second tapping state to the first tapping state, the first main contact, the second main contact, the first switching element and the third switching element are all in an off state, the second switching element is in an on state, the change-over switch is conducted with the first moving contact, the tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the first transition resistor and the second switching element in sequence.
When the transition circuit is in a seventh reverse sequence switching process of switching from the second tapping state to the first tapping state, the first main contact, the second main contact and the first switch element are in an off state, the second switch element and the third switch element are in an on state, the change-over switch is conducted with the first moving contact, the tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the change-over switch and the third switch element in sequence.
When the transition circuit is in an eighth reverse sequence switching process of switching from the second tapping state to the first tapping state, the first switch element and the second main contact are in an off state, the first main contact, the second switch element and the third switch element are in an on state, the change-over switch is conducted with the first moving contact, the tapping selector of the on-load tapping switch is connected with the first tapping gear, and load current flows out from the neutral point leading-out end through the first main contact.
The first switching element, the second switching element and the third switching element are at least one of a single-break vacuum contact, a double-break vacuum contact or a power electronic element with a controllable on-off function. The power electronic element with the controllable on-off function is an I GBT or MOSFET, etc.
In an embodiment, the first switching element, the second switching element and the third switching element are all power electronic elements, and in particular, referring to fig. 9, fig. 9 is a schematic diagram illustrating a switching element of an on-load tap-changer transition circuit according to an embodiment of the invention as a power electronic element. Wherein, MC1 is first main contact, MC2 is the second main contact, V1 is first switching element, V2 is second switching element, V3 is third switching element, T1 is the change over switch, R1 is first transition resistance, R2 is second transition resistance, 11 is the first moving contact of change over switch T1, 12 is the second moving contact of change over switch T1, N is first tapping gear, N+1 is second tapping gear.
In another embodiment, the first switching element, the second switching element and the third switching element are all dual-port vacuum contacts, and in particular, referring to fig. 10, fig. 10 is a schematic diagram illustrating a switching element of an on-load tap-changer transition circuit according to one embodiment of the present invention as a dual-port vacuum contact. Wherein, MC1 is first main contact, MC2 is the second main contact, V1 is first switching element, V2 is second switching element, V3 is third switching element, T1 is the change over switch, R1 is first transition resistance, R2 is second transition resistance, 11 is the first moving contact of change over switch T1, 12 is the second moving contact of change over switch T1, N is first tapping gear, N+1 is second tapping gear.
Still another embodiment of the present invention provides a voltage regulating method for an on-load tap changer, which is applied to a transition circuit of an on-load tap changer as described above, and in particular, please refer to fig. 11 to fig. 12, fig. 11 shows a switch on-off positive sequence switching control timing chart of the voltage regulating method for an on-load tap changer in one embodiment of the present invention, that is, a switch on-off timing control for controlling the transition circuit to switch from a first tap state to a second tap state, and fig. 12 shows a switch on-off reverse sequence switching control timing chart of the voltage regulating method for an on-load tap changer in one embodiment of the present invention, that is, a switch on-off timing control for controlling the transition circuit to switch from the first tap state to the second tap state. Wherein MC1 is first main contact, MC2 is the second main contact, V1 is first switching element, V2 is second switching element, V3 is third switching element, T1 is change-over switch.
The voltage regulating method of the on-load tap changer provided by the embodiment comprises the following steps:
When the transition circuit is in a first tapping state, the first main contact is disconnected and the third switch element is disconnected in sequence, the control change-over switch is disconnected from the first moving contact and is connected with the second moving contact, the third switch element is connected in sequence, the second switch element is disconnected, the first switch element is connected, the second main contact is connected, so that the on-load tapping switch is switched from a first tapping gear to a second tapping gear, wherein the first tapping state is that the first main contact, the third switch element and the second switch element are in a conducting state, the first switch element and the second main contact are in an disconnecting state, and the change-over switch is connected with the first moving contact;
When the transition circuit is in a second tapping position, the first switching element is turned off, the second switching element is turned on, the third switching element is turned off, the control change-over switch is turned off from the second moving contact and is turned on from the first moving contact, the third switching element is turned on, and the first main contact is turned on in turn, so that the on-load tapping switch is switched from the second tapping position to the first tapping position, wherein the second tapping position is that the first main contact and the second switching element are both in an off state, the first switching element, the second main contact and the third switching element are both in an on state, and the change-over switch is turned on from the second moving contact.
Preferably, an isolating switch is additionally arranged on the circuit where the existing vacuum contact is positioned so as to play a role in electrical isolation and protection.
Compared with the prior art, the on-load tap-changer transition circuit and the voltage regulating method provided by the embodiment of the invention have the beneficial effects that:
When the transition circuit is in a first tapping state, the first main contact is disconnected and the third switching element is disconnected in sequence; the control change-over switch is disconnected with the first moving contact and is conducted with the second moving contact; sequentially switching on the third switching element, switching off the second switching element, switching on the first switching element and switching on the second main contact, so that the on-load tap changer is switched from the first tap position to the second tap position; wherein the first tapping state is that the first main contact, the third switching element and the second switching element are all in the conducting state, the first switching element and the second main contact are all in the disconnecting state, the change-over switch is conducted with the first moving contact, when the transition circuit is in the second tapping state, the first switching element is sequentially disconnected, the second switching element is conducted, the third switching element is disconnected, the change-over switch is controlled to be disconnected with the second moving contact and to be conducted with the first moving contact, the third switching element is sequentially conducted, the first main contact is conducted, so that the on-load tapping switch is switched from the second tapping gear to the first tapping gear, wherein the second tapping state is that the first main contact and the second switching element are in the disconnecting state, the switching task is alternately born by the vacuum contacts, the excessive abrasion of a single contact is avoided, the safety of the power system is improved, the service life of the equipment is prolonged, the use of two transition resistance currents is reduced, the heating value of a single resistor is reduced, the time for arc burning in the vacuum contacts is provided, the arc process is reduced, the damage to the contacts is reduced, the contact is gradually reduced, the abrupt change of the arc current and the switching system is avoided, the abrupt change of the voltage is ensured, the switching system is stable, the safety of the power system is further improved.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1.一种有载分接开关过渡电路，其特征在于，包括第一主触头、第二主触头、第一开关元件、第二开关元件、第三开关元件、转换开关、第一过渡电阻和第二过渡电阻；1. An on-load tap changer transition circuit, comprising a first main contact, a second main contact, a first switching element, a second switching element, a third switching element, a transfer switch, a first transition resistor, and a second transition resistor; 其中，变压器调压绕组的第一分接档位分别和所述第一主触头、所述第一过渡电阻、所述转换开关的第一动触头三者连接；变压器调压绕组的第二分接档位分别和所述第二过渡电阻、所述第一开关元件、所述第二主触头三者连接；The first tap position of the transformer voltage regulating winding is respectively connected to the first main contact, the first transition resistor, and the first moving contact of the transfer switch; the second tap position of the transformer voltage regulating winding is respectively connected to the second transition resistor, the first switch element, and the second main contact; 所述第一过渡电阻的另一端和所述第二开关元件的一端连接，所述第三开关元件的一端分别和所述第一开关元件、所述转换开关二者连接；所述第二过渡电阻的另一端和所述转换开关的第二动触头连接；The other end of the first transition resistor is connected to one end of the second switching element, and one end of the third switching element is connected to the first switching element and the transfer switch respectively; the other end of the second transition resistor is connected to the second moving contact of the transfer switch; 所述第一主触头、所述第二主触头、所述第二开关元件、所述第三开关元件的另一端均和有载分接开关的中性点引出端连接。The other ends of the first main contact, the second main contact, the second switching element, and the third switching element are all connected to the neutral point lead-out terminal of the on-load tap changer. 2.根据权利要求1所述的一种有载分接开关过渡电路，其特征在于，当所述第一主触头、所述第三开关元件和所述第二开关元件均处于导通状态，所述第一开关元件和所述第二主触头均处于断开状态，所述转换开关与所述第一动触头导通时，有载分接开关的分接选择器与所述第一分接档位相连接，负载电流经过所述第一主触头从所述中性点引出端流出；2. The on-load tap changer transition circuit according to claim 1, characterized in that when the first main contact, the third switching element, and the second switching element are all in the on state, the first switching element and the second main contact are both in the off state, and the transfer switch is in conduction with the first moving contact, the tap selector of the on-load tap changer is connected to the first tap position, and the load current flows out of the neutral point lead-out terminal through the first main contact; 当所述第二主触头、所述第一开关元件、所述第三开关元件均处于导通状态，所述第一主触头、所述第二开关元件均处于断开状态，所述转换开关与所述第二动触头导通时，有载分接开关的分接选择器与所述第二分接档位相连接，负载电流经过所述第二主触头从所述中性点引出端流出。When the second main contact, the first switching element, and the third switching element are all in the on state, and the first main contact and the second switching element are all in the off state, and the transfer switch is connected to the second moving contact, the tap selector of the on-load tap changer is connected to the second tap position, and the load current flows out from the neutral point lead-out terminal through the second main contact. 3.根据权利要求1所述的一种有载分接开关过渡电路，其特征在于，当所述第一主触头、所述第二主触头和所述第一开关元件均处于断开状态，所述第二开关元件和所述第三开关元件均处于导通状态，所述转换开关与所述第一动触头导通时，有载分接开关的分接选择器与所述第一分接档位相连接，负载电流依次经过所述转换开关和所述第三开关元件从所述中性点引出端流出；3. The on-load tap changer transition circuit according to claim 1, characterized in that when the first main contact, the second main contact, and the first switching element are all in the off state, the second switching element and the third switching element are both in the on state, and the transfer switch is conductively connected to the first moving contact, the tap selector of the on-load tap changer is connected to the first tap position, and the load current sequentially flows through the transfer switch and the third switching element and out of the neutral point lead-out terminal; 当所述第一开关元件、所述第三开关元件均处于导通状态，所述第一主触头、所述第二主触头、所述第二开关元件均处于断开状态，所述转换开关与所述第二动触头导通时，有载分接开关的分接选择器与所述第二分接档位相连接，负载电流依次经过所述第一开关元件和所述第三开关元件从所述中性点引出端流出。When the first switching element and the third switching element are both in the on state, the first main contact, the second main contact, and the second switching element are all in the off state, and the transfer switch is connected to the second moving contact, the tap selector of the on-load tap changer is connected to the second tap position, and the load current sequentially passes through the first switching element and the third switching element and flows out of the neutral point lead-out terminal. 4.根据权利要求1所述的一种有载分接开关过渡电路，其特征在于，当所述第一主触头、所述第二主触头、所述第一开关元件和所述第三开关元件均处于断开状态，所述第二开关元件处于均处于断开状态，所述转换开关与所述第一动触头导通时，有载分接开关的分接选择器与所述第一分接档位相连接，负载电流依次经过所述第一过渡电阻和所述第二开关元件从所述中性点引出端流出；4. The on-load tap changer transition circuit according to claim 1, characterized in that when the first main contact, the second main contact, the first switching element, and the third switching element are all in the off state, and the second switching element is all in the off state, and the transfer switch is conductively connected to the first moving contact, the tap selector of the on-load tap changer is connected to the first tap position, and the load current sequentially flows through the first transition resistor and the second switching element and out of the neutral point lead-out terminal; 当所述第三开关元件处于导通状态，所述第一主触头、所述第二主触头、所述第一开关元件和所述第二开关元件均处于断开状态，所述转换开关与所述第二动触头导通时，有载分接开关的分接选择器与所述第二分接档位相连接，负载电流依次经过所述第二过渡电阻和所述第三开关元件从所述中性点引出端流出。When the third switching element is in the on state, the first main contact, the second main contact, the first switching element, and the second switching element are all in the off state, and when the transfer switch is connected to the second moving contact, the tap selector of the on-load tap changer is connected to the second tap position, and the load current flows out of the neutral point lead-out terminal through the second transition resistor and the third switching element in sequence. 5.根据权利要求1所述的一种有载分接开关过渡电路，其特征在于，当所述第一主触头、所述第二主触头、所述第一开关元件和所述第三开关元件均处于断开状态，所述第二开关元件处于导通状态，所述转换开关与所述第二动触头导通时，有载分接开关的分接选择器与所述第一分接档位相连接，负载电流依次经过所述第一过渡电阻和所述第二开关元件从所述中性点引出端流出；5. The on-load tap changer transition circuit according to claim 1, characterized in that when the first main contact, the second main contact, the first switching element, and the third switching element are all in the off state, the second switching element is in the on state, and the transfer switch is in conduction with the second moving contact, the tap selector of the on-load tap changer is connected to the first tap position, and the load current sequentially flows through the first transition resistor and the second switching element and out of the neutral point lead-out terminal; 当所述第二开关元件和所述第三开关元件均处于导通状态，所述第一主触头、所述第二主触头和所述第一开关元件均处于断开状态，所述转换开关与所述第二动触头导通时，有载分接开关的分接选择器分别与所述第一分接档位、所述第二分接档位相连接，负载电流分别经第一通路和第二通路从所述中性点引出端流出；其中，所述第一通路依次经过所述第一过渡电阻和所述第二开关元件，所述第二通路依次经过所述第二过渡电阻、所述转换开关和所述第三开关元件。When the second switching element and the third switching element are both in the on state, the first main contact, the second main contact, and the first switching element are all in the off state, and the transfer switch is in conduction with the second moving contact, the tap selector of the on-load tap changer is connected to the first tap position and the second tap position, respectively, and the load current flows out of the neutral point lead-out terminal through the first path and the second path, respectively; wherein the first path passes through the first transition resistor and the second switching element in sequence, and the second path passes through the second transition resistor, the transfer switch, and the third switching element in sequence. 6.根据权利要求1所述的一种有载分接开关过渡电路，其特征在于，当所述第一主触头、所述第二主触头、所述第一开关元件均处于断开状态，所述第二开关元件和所述第三开关元件均处于导通状态，所述转换开关与所述第二动触头导通时，有载分接开关的分接选择器分别与所述第一分接档位、所述第二分接档位相连接，负载电流分别经第一通路和第二通路从所述中性点引出端流出；其中，所述第一通路依次经过所述第一过渡电阻和所述第二开关元件，所述第二通路依次经过所述第二过渡电阻、所述转换开关和所述第三开关元件；6. The on-load tap changer transition circuit according to claim 1, characterized in that when the first main contact, the second main contact, and the first switching element are all in the off state, the second switching element and the third switching element are both in the on state, and the transfer switch is in conduction with the second moving contact, the tap selector of the on-load tap changer is connected to the first tap position and the second tap position, respectively, and the load current flows out of the neutral point lead-out terminal through a first path and a second path, respectively; wherein the first path sequentially passes through the first transition resistor and the second switching element, and the second path sequentially passes through the second transition resistor, the transfer switch, and the third switching element; 当所述第一主触头、所述第二主触头、所述第一开关元件和所述第三开关元件均处于断开状态，所述第二开关元件处于导通状态，所述转换开关与所述第二动触头导通时，有载分接开关的分接选择器与所述第一分接档位相连接，负载电流依次经过所述第一过渡电阻和所述第二开关元件从所述中性点引出端流出。When the first main contact, the second main contact, the first switching element, and the third switching element are all in the disconnected state, the second switching element is in the on state, and the transfer switch is conductively connected to the second moving contact, the tap selector of the on-load tap changer is connected to the first tap position, and the load current sequentially flows through the first transition resistor and the second switching element and out of the neutral point lead-out terminal. 7.根据权利要求1所述的一种有载分接开关过渡电路，其特征在于，当所述第一主触头、所述第二主触头、所述第一开关元件和所述第二开关元件均处于断开状态，所述第三开关元件处于导通状态，所述转换开关与所述第二动触头导通时，有载分接开关的分接选择器与所述第二分接档位相连接，负载电流依次经过所述第二过渡电阻、所述转换开关和所述第三开关元件从所述中性点引出端流出；7. The on-load tap changer transition circuit according to claim 1, characterized in that when the first main contact, the second main contact, the first switching element, and the second switching element are all in the off state, the third switching element is in the on state, and the transfer switch is conductively connected to the second moving contact, the tap selector of the on-load tap changer is connected to the second tapping position, and the load current sequentially flows through the second transition resistor, the transfer switch, and the third switching element and out of the neutral point lead-out terminal; 当所述第一主触头、所述第二主触头、所述第一开关元件和所述第三开关元件均处于断开状态，所述第二开关元件处于导通状态，所述转换开关与所述第一动触头导通时，有载分接开关的分接选择器与所述第一分接档位相连接，负载电流依次经过所述第一过渡电阻和所述第二开关元件从所述中性点引出端流出。When the first main contact, the second main contact, the first switching element, and the third switching element are all in the disconnected state, the second switching element is in the on state, and the transfer switch is conductively connected to the first moving contact, the tap selector of the on-load tap changer is connected to the first tap position, and the load current sequentially flows through the first transition resistor and the second switching element and out of the neutral point lead-out terminal. 8.根据权利要求1所述的一种有载分接开关过渡电路，其特征在于，当所述第一主触头、所述第二主触头和所述第二开关元件均处于断开状态，所述第一开关元件和所述第三开关元件均处于导通状态，所述转换开关与所述第二动触头导通时，有载分接开关的分接选择器与所述第二分接档位相连接，负载电流依次经过所述第一开关元件和所述第三开关元件从所述中性点引出端流出；8. The on-load tap changer transition circuit according to claim 1, characterized in that when the first main contact, the second main contact, and the second switching element are all in the off state, the first switching element and the third switching element are both in the on state, and the transfer switch is conductively connected to the second moving contact, the tap selector of the on-load tap changer is connected to the second tapping position, and the load current sequentially flows through the first switching element and the third switching element and out of the neutral point lead-out terminal; 当所述第一主触头、所述第二主触头和所述第一开关元件均处于断开状态，所述第二开关元件和所述第三开关元件均处于导通状态，所述转换开关与所述第一动触头导通时，有载分接开关的分接选择器与所述第一分接档位相连接，负载电流依次经过所述转换开关和所述第三开关元件从所述中性点引出端流出。When the first main contact, the second main contact, and the first switching element are all in the disconnected state, the second switching element and the third switching element are both in the on state, and the transfer switch is conductively connected to the first moving contact, the tap selector of the on-load tap changer is connected to the first tap position, and the load current sequentially passes through the transfer switch and the third switching element and flows out of the neutral point lead-out terminal. 9.根据权利要求1所述的一种有载分接开关过渡电路，其特征在于，当所述第一主触头和所述第二开关元件均处于断开状态，所述第一开关元件、所述第二主触头和所述第三开关元件均处于导通状态，所述转换开关与所述第二动触头导通时，有载分接开关的分接选择器与所述第二分接档位相连接，负载电流经过所述第二主触头从所述中性点引出端流出；9. The on-load tap changer transition circuit according to claim 1, characterized in that when the first main contact and the second switching element are both in the off state, the first switching element, the second main contact, and the third switching element are all in the on state, and the transfer switch is in conduction with the second moving contact, the tap selector of the on-load tap changer is connected to the second tapping position, and the load current flows out of the neutral point lead-out terminal through the second main contact; 当所述第一开关元件和所述第二主触头均处于断开状态，所述第一主触头、所述第二开关元件和所述第三开关元件均处于导通状态，所述转换开关与所述第一动触头导通时，有载分接开关的分接选择器与所述第一分接档位相连接，负载电流经过所述第一主触头从所述中性点引出端流出。When the first switching element and the second main contact are both in the disconnected state, the first main contact, the second switching element, and the third switching element are all in the on state, and the transfer switch is connected to the first moving contact, the tap selector of the on-load tap changer is connected to the first tap position, and the load current flows out of the neutral point lead-out terminal through the first main contact. 10.一种有载分接开关调压方法，应用于如权利要求1-9中任一项所述的一种有载分接开关过渡电路，其特征在于，所述方法包括：10. A method for regulating voltage of an on-load tap changer, applied to an on-load tap changer transition circuit according to any one of claims 1 to 9, characterized in that the method comprises: 当所述过渡电路处于第一分接状态时，则依次将第一主触头断开、将第三开关元件断开；控制转换开关与第一动触头断开、与第二动触头导通；依次将第三开关元件导通、将第二开关元件断开、将第一开关元件导通、将第二主触头导通，以使得有载分接开关从第一分接档位切换到第二分接档位；其中，所述第一分接状态为所述第一主触头、所述第三开关元件和所述第二开关元件均处于导通状态，所述第一开关元件和所述第二主触头均处于断开状态，所述转换开关与所述第一动触头导通；When the transition circuit is in the first tap state, the first main contact and the third switch element are disconnected in sequence; the transfer switch is controlled to disconnect from the first moving contact and connect with the second moving contact; the third switch element is connected, the second switch element is disconnected, the first switch element is connected, and the second main contact is connected in sequence, so that the on-load tap changer switches from the first tap position to the second tap position; wherein the first tap state is that the first main contact, the third switch element, and the second switch element are all in the on state, the first switch element and the second main contact are both in the off state, and the transfer switch is connected to the first moving contact; 当所述过渡电路处于第二分接状态时，则依次将第一开关元件断开、将第二开关元件导通、将第三开关元件断开，控制转换开关与第二动触头断开、与第一动触头导通，依次将第三开关元件导通、将第一主触头导通，以使得有载分接开关从第二分接档位切换到第一分接档位；其中，所述第二分接状态为所述第一主触头和所述第二开关元件均处于断开状态，所述第一开关元件、所述第二主触头和所述第三开关元件均处于导通状态，所述转换开关与所述第二动触头导通。When the transition circuit is in the second tap state, the first switching element is disconnected, the second switching element is turned on, and the third switching element is disconnected in sequence, the transfer switch is controlled to disconnect from the second moving contact and to be connected to the first moving contact, the third switching element is turned on in sequence, and the first main contact is turned on, so that the on-load tap changer switches from the second tap position to the first tap position; wherein, the second tap state is that the first main contact and the second switching element are both in the disconnected state, the first switching element, the second main contact, and the third switching element are all in the on state, and the transfer switch is connected to the second moving contact.
CN202510610350.8A 2025-05-13 2025-05-13 On-load tap-changer transition circuit and voltage regulating method Pending CN120511162A (en)

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