CN110703133A - Outdoor signal source device - Google Patents
Outdoor signal source device Download PDFInfo
- Publication number
- CN110703133A CN110703133A CN201910976726.1A CN201910976726A CN110703133A CN 110703133 A CN110703133 A CN 110703133A CN 201910976726 A CN201910976726 A CN 201910976726A CN 110703133 A CN110703133 A CN 110703133A
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- box body
- signal source
- voltage
- source device
- fault
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- 229910018503 SF6 Inorganic materials 0.000 claims description 4
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 4
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 4
- 239000010963 304 stainless steel Substances 0.000 claims description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 3
- 230000008033 biological extinction Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009421 internal insulation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides an outdoor signal source device. The outdoor signal source device is arranged on an outdoor transformer substation or a distribution line, and comprises an electrical element and a mechanical structure; the electric elements comprise a controller, a vacuum contactor, a high-voltage resistor, a voltage sensor and a current sensor; the controller is used for judging a line fault area of the system and controlling the vacuum contactor to inject a characteristic coding current signal into the line fault area through the high-voltage resistor; the mechanical structure comprises a box body, and the electric elements are arranged on the box body. The signal source device can judge and identify a fault phase and a fault section when a single-phase earth fault occurs in a system; automatically injecting characteristic coding current signals into a fault section of a fault phase line by controlling the action of the vacuum contactor; when the special zero sequence CT installed on the circuit detects the characteristic coding current signal, the controller drives the fault indicator to display a fault and drives the electronic switch to act at the same time.
Description
Technical Field
The invention relates to a ring main unit, in particular to an outdoor signal source device.
Background
In the electric power system of China, two grounding modes are available: the neutral point direct grounding mode and the neutral point indirect grounding mode. The 6-66 kV power distribution network adopts a mode that a neutral point is not directly grounded, and in a system adopting the grounding mode, when a single-phase grounding fault occurs, grounding short-circuit current is very small, so that the system is called a low-current grounding system.
Among various faults of the power distribution network, the probability of single-phase earth faults of the power distribution network is the highest, and can account for about 80% of total faults. When single-phase earth fault occurs, the power supply can still ensure the symmetry of line voltage, and because the fault current is small, the continuous power supply to the load is not influenced, so that the load does not need to be tripped immediately and can continue to operate for 1-2 hours according to the preset rule. When the single-phase grounding of the power distribution network occurs, relay protection is generally required to select a line with a grounding fault and send a signal in time.
At present, a small-current grounding system is mostly adopted in a power distribution network, and when a single-phase grounding fault occurs in the system, the fault point is very difficult to find due to the fact that fault current is small and fault characteristics are complex.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an outdoor signal source device.
The invention provides an outdoor signal source device, which adopts the technical scheme that:
an outdoor signal source device comprises an electrical element and a mechanical structure;
the electric elements comprise a controller, a vacuum contactor, a high-voltage resistor, a voltage sensor and a current sensor; the controller is used for judging a line fault area of a system and controlling the vacuum contactor to inject characteristic coded current signals into the line fault area through the high-voltage resistor, the voltage sensor is used for detecting voltage in the system, and the current sensor is used for detecting current in the system;
the mechanical structure comprises a box body, and the vacuum contactor, the high-voltage resistor, the voltage sensor and the current sensor are all installed on the box body.
The outdoor signal source device provided by the invention also comprises the following auxiliary technical scheme:
the voltage sensor is arranged on the outer side of the box body, and the current sensor is arranged on the inner side of the box body.
The box body is provided with a secondary cable control interface, and the secondary cable control interface is provided with an aviation connector.
The outer side of the box body is provided with an insulating sleeve, the insulating sleeve comprises a grounding sleeve and a wire inlet sleeve, the grounding sleeve is used as a grounding end, and the wire inlet sleeve is used as a high-voltage wiring terminal.
The grounding sleeve is arranged on the rear side of the box body, and the wire inlet sleeve is arranged on the front side of the box body.
Wherein, an explosion-proof pressure relief device is arranged on the box body.
The rated voltage of the controller is alternating current voltage, the voltage value of the controller is 187-253V, and the resistance value of the high-voltage resistor is 665-735 omega.
Wherein, the outside bottom of box is provided with the support or the cross arm that are used for fixing the box.
Wherein, sulfur hexafluoride gas with absolute pressure of 0.10-0.16MPa is filled in the box body; the vacuum contactor adopts vacuum arc extinction.
The box body is made of a 304 stainless steel plate, and the surface of the box body is polished or subjected to plastic spraying treatment; the thickness of the box body is not less than 2.5 mm.
The implementation of the invention comprises the following technical effects:
the outdoor signal source device provided by the invention can judge and identify a fault phase and a fault section when a single-phase earth fault occurs in a system; automatically injecting characteristic coding current signals into a fault section of a fault phase line by controlling the action of the vacuum contactor; when the special zero sequence CT installed on the circuit detects the characteristic coding current signal, the controller drives the fault indicator to display a fault and drives the electronic switch to act at the same time.
The outdoor signal source device is based on a small current grounding fault signal injection diagnosis method, combines the characteristics of single-phase grounding faults of a small current grounding system, and realizes fault line selection and fault point positioning by detecting injected characteristic coding current signals. Specifically, when a single-phase earth fault occurs at any point on a line, after a signal source arranged on a transformer substation or a distribution line detects fault information, a fault phase is judged firstly, then a characteristic coded current signal is applied to the fault phase, a probe arranged on an overhead line detects the characteristic coded current signal flowing through the line, if the characteristic coded current signal meets the fault characteristic, namely the voltage of the fault phase is reduced and the zero sequence voltage is increased, the probe is started to give a red warning, and a special zero sequence CT arranged on a cable line detects the characteristic coded current signal, so that a fault indicator is driven to display, and an electronic switch is driven to act at the same time.
Drawings
Fig. 1 is a perspective view of an outdoor signal source device according to the present invention.
Fig. 2 is a front view of an outdoor signal source apparatus of the present invention.
Fig. 3 is a side view of an outdoor signal source apparatus of the present invention.
Fig. 4 is a top view of an outdoor signal source apparatus according to the present invention.
Fig. 5 is a circuit diagram of an outdoor signal source apparatus according to the present invention.
Fig. 6 is a pulse diagram of an outdoor signal source apparatus according to the present invention.
In the figure, 1-box, 2-vacuum contactor, 3-high voltage resistor, 4-voltage sensor, 5-current sensor, 6-aviation connector, 7-grounding sleeve, 8-incoming sleeve, 9-bracket or cross arm, 21-electromagnetic voltage transformer, 22-electronic voltage transformer, 23-vacuum contactor, 24-high voltage resistor, 25-current transformer, 26-signal source.
Detailed Description
The present invention will be described in detail below with reference to embodiments and drawings, it being noted that the described embodiments are only intended to facilitate the understanding of the present invention, and do not limit it in any way.
The orientations described in the present application, such as up, down, left, right, and left, are convenient to use and described with reference to the drawings, and do not limit the scope of protection.
The outdoor signal source device provided by the invention, as shown in fig. 1-4, comprises an electrical element and a mechanical structure;
the electric elements comprise a controller, a vacuum contactor 2, a high-voltage resistor 3, a voltage sensor 4 and a current sensor 5; the controller is used for judging a line fault area of a system and controlling the vacuum contactor 2 to inject characteristic coded current signals into the line fault area through the high-voltage resistor 3, the voltage sensor 4 is used for detecting voltage in the system, and the current sensor 5 is used for detecting current in the system;
the mechanical structure comprises a box body 1, wherein the vacuum contactor 2, the high-voltage resistor 3, the voltage sensor 4 and the current sensor 5 are all arranged on the box body.
The outdoor signal source device provided by the invention can judge and identify a fault phase and a fault section when a single-phase earth fault occurs in a system; automatically injecting characteristic coding current signals into a fault section of a fault phase line by controlling the action of the vacuum contactor; when the special zero sequence CT installed on the circuit detects the characteristic coding current signal, the controller drives the fault indicator to display a fault and drives the electronic switch to act at the same time.
The outdoor signal source device is based on a small current grounding fault signal injection diagnosis method, combines the characteristics of single-phase grounding faults of a small current grounding system, and realizes fault line selection and fault point positioning by detecting injected characteristic coding current signals.
Fig. 5 is a circuit diagram of the present application, and as shown in fig. 5, an electromagnetic voltage transformer 21 is provided on a main line, one end of an electronic voltage transformer 22 is connected to the main line, the other end is connected to one end of a vacuum contactor 23, the other end of the vacuum contactor 23 is connected to one end of a high-voltage resistor 24, the other end of the high-voltage resistor is connected to a current transformer 25 for measuring current, and the other end of the current transformer is connected to a signal source 26.
Specifically, as shown in fig. 5, when a single-phase ground fault occurs at any point on a line, after a signal source installed on a substation or a distribution line detects fault information, a fault phase is determined first, then a characteristic coded current signal is applied to the fault phase, a probe installed on an overhead line detects the characteristic coded current signal flowing through the line, if the characteristic coded current signal satisfies a fault characteristic, i.e., the voltage of the fault phase is reduced, and the zero sequence voltage is increased, the probe is started to give a red warning, and a special CT installed on a cable line detects the characteristic coded current signal, so as to drive a fault indicator to display, and drive an electronic switch to operate.
As shown in fig. 6, when a ground fault occurs, the signal source device in this embodiment injects a regular pulse sequence in the ground fault region; in fig. 6, Δ t1 is a contactor pull-in time, and Δ t2 and Δ t3 are contactor open times.
Where Δ t1 is set to 120 ms; Δ t2 is set to 680 ms; Δ t3 is set to 880 ms.
The rated voltage of the controller is alternating current voltage, the voltage value is 220V +/-15%, and the controller is installed at an outdoor terminal, so that the controller is required to be compact and small in structural design and has the requirements of dust prevention and rain prevention, and the protection grade is not lower than the IP65 specified in GB 4208; the resistance value of the high-voltage resistor is 700 omega +/-5%, the ground insulation resistance of a primary loop of the high-voltage resistor is larger than 10M omega, the high-voltage resistor can work under short-time rated current, and the resistance wire is free of loosening and local overheating.
Alternatively, as shown in fig. 1, the voltage sensor 4 is disposed outside the case 1, and the current sensor 5 is disposed inside the case 1. In the embodiment, the voltage sensor is insulated by air, has larger volume and is arranged outside the box body; and the current transformer is small in size, so that the current transformer can be installed in the box body under the condition that the internal insulation distance is enough.
Optionally, as shown in fig. 3, a secondary cable control interface is provided on the box body 1, and an aviation connector 6 is provided on the secondary cable control interface. In this embodiment, since the box 1 is sealed by gas, the secondary cable inside the box must be connected to an external controller through the secondary cable control interface 6.
As shown in fig. 1 to 4, an insulating sleeve is arranged on the outer side of the box body 1, the insulating sleeve includes a grounding sleeve 7 and a wire inlet sleeve 8, the grounding sleeve 7 is used as a grounding terminal, and the wire inlet sleeve 8 is used as a high-voltage wiring terminal.
The insulating sleeve is made of a porcelain material, so that the dirt resistance, ageing resistance and corrosion resistance of the insulating sleeve are improved.
Optionally, the grounding sleeve 7 is disposed at the rear side of the box body 1, and the wire inlet sleeve 8 is disposed at the front side of the box body 1.
Optionally, an explosion-proof pressure relief device is arranged on the box body 1.
Preferably, a bracket or a cross arm 9 for fixing the box body is arranged at the bottom of the outer side of the box body 1, so that the box body can be firmly installed on an outdoor substation or a distribution line.
Preferably, the box body 1 is filled with sulfur hexafluoride gas with the absolute pressure of 0.10-0.16 MPa; the vacuum contactor adopts vacuum arc extinction.
More preferably, the box body 1 is filled with sulfur hexafluoride gas with an absolute pressure of 0.13 MPa.
The box body 1 is made of a 304 stainless steel plate, and the surface of the box body is polished or subjected to plastic spraying treatment; the thickness of the box body 1 is not less than 2.5 mm. The case in this embodiment has sufficient rigidity and good rust prevention performance.
It should be noted that the zero sequence CT described in the present application, which is a zero sequence current transformer, is also called a residual current transformer, a ground current transformer or a leakage current transformer, is used for detecting a neutral unbalanced current, and is generally used in cooperation with a relay protection device; when the zero sequence grounding current is generated by the power system, the zero sequence current transformer is matched with a relay protection device or a signal for use, so that the device element acts, and the protection or the monitoring is realized.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. An outdoor signal source device is arranged on an outdoor transformer substation or a distribution line, and is characterized by comprising an electric element and a mechanical structure;
the electric elements comprise a controller, a vacuum contactor, a high-voltage resistor, a voltage sensor and a current sensor; the controller is used for judging a line fault area of a system and controlling the vacuum contactor to inject characteristic coded current signals into the line fault area through the high-voltage resistor, the voltage sensor is used for detecting voltage in the system, and the current sensor is used for detecting current in the system;
the mechanical structure comprises a box body, and the vacuum contactor, the high-voltage resistor, the voltage sensor and the current sensor are all installed on the box body.
2. An outdoor signal source device according to claim 1, wherein: the voltage sensor is arranged on the outer side of the box body, and the current sensor is arranged on the inner side of the box body.
3. An outdoor signal source device according to claim 1 or 2, characterized in that: the box body is provided with a secondary cable control interface, and the secondary cable control interface is provided with an aviation connector.
4. An outdoor signal source device according to claim 1 or 2, characterized in that: the outside of box is provided with insulation support, insulation support includes ground sleeve and inlet wire sleeve, ground sleeve is used for as the earthing terminal, the inlet wire sleeve is used for as high voltage binding post.
5. An outdoor signal source device according to claim 4, wherein: the grounding sleeve is arranged on the rear side of the box body, and the wire inlet sleeve is arranged on the front side of the box body.
6. An outdoor signal source device according to claim 1 or 2, characterized in that: an explosion-proof pressure relief device is arranged on the box body.
7. An outdoor signal source device according to claim 1 or 2, characterized in that: the rated voltage of the controller is alternating current voltage, the voltage value of the controller is 187-253V, and the resistance value of the high-voltage resistor is 665-735 omega.
8. An outdoor signal source device according to claim 1 or 2, characterized in that: and a bracket or a cross arm for fixing the box body is arranged at the bottom of the outer side of the box body.
9. An outdoor signal source device according to claim 1 or 2, characterized in that: sulfur hexafluoride gas with absolute pressure of 0.10-0.16MPa is filled in the box body; the vacuum contactor adopts vacuum arc extinction.
10. An outdoor signal source device according to claim 1 or 2, characterized in that: the box body is made of a 304 stainless steel plate, and the surface of the box body is polished or sprayed with plastic; the thickness of the box body is not less than 2.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910976726.1A CN110703133A (en) | 2019-10-15 | 2019-10-15 | Outdoor signal source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910976726.1A CN110703133A (en) | 2019-10-15 | 2019-10-15 | Outdoor signal source device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110703133A true CN110703133A (en) | 2020-01-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910976726.1A Pending CN110703133A (en) | 2019-10-15 | 2019-10-15 | Outdoor signal source device |
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| Country | Link |
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| CN (1) | CN110703133A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731057A (en) * | 2020-12-21 | 2021-04-30 | 青岛鼎信通讯股份有限公司 | Offline low-voltage cable ground fault positioning device based on pulse coding |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5341268A (en) * | 1991-12-16 | 1994-08-23 | Kabushiki Kaisha Toshiba | Method of and system for disconnecting faulty distribution line section from power distribution line |
| CN101975911A (en) * | 2010-10-12 | 2011-02-16 | 思源电气股份有限公司 | Earth fault judging method for overhead line fault indicator |
| CN204462750U (en) * | 2015-03-25 | 2015-07-08 | 威胜电气有限公司 | Ground signalling source |
| CN105807187A (en) * | 2016-04-28 | 2016-07-27 | 云南电力试验研究院(集团)有限公司 | Single-phase ground-fault assist detection device |
| CN106124926A (en) * | 2016-06-15 | 2016-11-16 | 北京科锐博实电气设备有限公司 | Outdoor signal source device on a kind of post |
| CN106908686A (en) * | 2017-04-21 | 2017-06-30 | 国网安徽省电力公司淮北供电公司 | Single-phase grounded malfunction in grounded system of low current reliability judgment means based on asymmetric method |
| CN211179940U (en) * | 2019-10-15 | 2020-08-04 | 郑州空港科锐电力设备有限公司 | Outdoor signal source device |
-
2019
- 2019-10-15 CN CN201910976726.1A patent/CN110703133A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5341268A (en) * | 1991-12-16 | 1994-08-23 | Kabushiki Kaisha Toshiba | Method of and system for disconnecting faulty distribution line section from power distribution line |
| CN101975911A (en) * | 2010-10-12 | 2011-02-16 | 思源电气股份有限公司 | Earth fault judging method for overhead line fault indicator |
| CN204462750U (en) * | 2015-03-25 | 2015-07-08 | 威胜电气有限公司 | Ground signalling source |
| CN105807187A (en) * | 2016-04-28 | 2016-07-27 | 云南电力试验研究院(集团)有限公司 | Single-phase ground-fault assist detection device |
| CN106124926A (en) * | 2016-06-15 | 2016-11-16 | 北京科锐博实电气设备有限公司 | Outdoor signal source device on a kind of post |
| CN106908686A (en) * | 2017-04-21 | 2017-06-30 | 国网安徽省电力公司淮北供电公司 | Single-phase grounded malfunction in grounded system of low current reliability judgment means based on asymmetric method |
| CN211179940U (en) * | 2019-10-15 | 2020-08-04 | 郑州空港科锐电力设备有限公司 | Outdoor signal source device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731057A (en) * | 2020-12-21 | 2021-04-30 | 青岛鼎信通讯股份有限公司 | Offline low-voltage cable ground fault positioning device based on pulse coding |
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Application publication date: 20200117 |