WO2017107744A1 - Main circuit of solid insulated switchgear and solid insulated switchgear using the main circuit - Google Patents

Abstract

Disclosed are a main circuit (1) of a solid insulated switchgear and a solid insulated switchgear using the main circuit (1). The main circuit (1) of a solid insulated switchgear comprises a three-phase single-electrode structure. The single-electrode structure of each phase is configured to expand horizontally. The three-phase single-electrode structure is arranged vertically. The three-phase single-electrode structure of main circuit (1) expands horizontally and is arranged vertically, so that the width of the solid insulated switchgear can be reduced, thereby resolving a problem of a large width of a conventional solid insulated switchgear.

Description

Main circuit of solid insulated cabinet and solid insulated cabinet using same Technical field

The invention relates to the field of switchgear, in particular to a main circuit of a solid insulated cabinet and a solid insulated cabinet using the same.

Background technique

At present, in the distribution switch market, solid insulated switchgear is widely used as a green environmental protection switch product. However, the main circuit structure in the current switchgear cabinet generally adopts a horizontal layout structure, resulting in a cabinet size that is too large. The station switch is vacuum or air insulated, which is not reliable and is susceptible to the external environment. The main circuit structure of the commonly used solid insulated cabinet generally adopts a unipolar structure longitudinally and a three-pole structure is arranged laterally. For example, a three-station solid insulated switchgear disclosed in the publication No. CN103346504A published on 20131009, including A which is assembled side by side. , B, C phase main circuit box, the three-pole main circuit box body monopole structure is longitudinally unfolded, A, B, C phase main circuit box is horizontally arranged, resulting in a large cabinet width, disassembly and commissioning inconvenient.

Summary of the invention

The purpose of embodiments of the present invention is to provide a main circuit of a solid insulated cabinet to solve the problem of the current wide size of the solid insulated cabinet.

In addition, it is an object of embodiments of the present invention to provide a solid insulated cabinet using the main circuit of the solid insulated cabinet described above.

The technical solution of the embodiment of the present invention is:

A first aspect of an embodiment of the present invention provides a main circuit of a solid insulated cabinet, wherein the main circuit includes a three-phase monopole structure, the monopolar structures of the phases are laterally expanded, and the three-phase monopole structure is vertically arranged. .

In the above solution, the single-pole structure of each phase comprises a busbar module, a three-station module, an inlet and outlet module, and a breaking module for opening and closing loads and short-circuit currents from the top to the bottom.

In the above solution, the three-station module has a coaxial cylindrical electrode structure that seals the air cavity.

In the above solution, the three-station module includes an isolated static contact, a conductive contact, a grounded static contact, a movable contact, and the movable contact respectively separates the isolated static contact, the conductive contact, and the grounded static contact The movable conductive connection, the isolated static contact, the conductive contact, and the grounded static contact are fixedly connected by the cast insulating sleeve, and the movable contact is disposed inside the insulating sleeve and is electrically connected with the conductive contact, and the movable contact is connected. Under the driving of the three-station operating mechanism, the moving contact is driven up and down in a straight line to complete the gear rack structure with three states of isolation, conduction and grounding.

In the above solution, the main circuit is encapsulated by an insulating material, and the outer casing of the insulating material is coated with a ground layer.

In the above solution, the inlet and outlet line module comprises an insulating plug, a sealing rubber pad, and a main circuit phase sequence for distributing the busbar side from the front to the rear to convert the phase sequence structure from left to right as seen from the front of the cabinet body. The copper cable, the in-out copper cable and the conductive contact form an electrical connection.

The embodiment of the invention also discloses a solid insulation cabinet, comprising a cabinet body and a main circuit, wherein the main circuit comprises a three-phase monopole structure, and the monopolar structures of the phases are laterally unfolded, and the three-phase monopole structure is Arrange vertically.

In the above solution, each phase monopolar structure comprises a bus bar module, a three-station module with a coaxial cylindrical electrode structure with a sealed air cavity, an inlet and outlet module, and a breaking module for opening and closing loads and short-circuit currents. The busbar module, the breaking module, the three-station module, and the incoming and outgoing line modules are laterally deployed from top to bottom.

In the above solution, the inlet and outlet line module comprises an insulating plug, a sealing rubber pad, and a main circuit phase sequence for distributing the busbar side from the front to the rear to convert the phase sequence structure from left to right as seen from the front of the cabinet body. The copper cable, the in-out copper cable and the conductive contact form an electrical connection.

In the above solution, the cabinet includes a pressure relief passage, a main circuit compartment, a cable compartment, and a mechanism Room and instrument room, the main circuit is fixed in the main circuit compartment, the pressure relief channel is fixed on the left side of the main circuit compartment, and the instrument room, the mechanism room and the cable room are arranged from the top to the bottom in the longitudinal direction of the main circuit compartment. Right.

The main circuit of the solid insulation cabinet according to the embodiment of the invention comprises a three-phase monopole structure, the monopolar structures of the phases are laterally unfolded, and the three-phase monopole structure is arranged longitudinally, by making the three-phase monopole of the main circuit The structure is laterally unfolded and arranged longitudinally, which can reduce the cabinet width of the solid insulated cabinet, and solves the problem of the current wide size of the solid insulated cabinet.

DRAWINGS

Figure 1 is a general structural view of an embodiment of a solid insulated cabinet of the present invention;

Figure 2 is a detailed structural view of the main circuit of Figure 1;

Figure 3 is a cross-sectional view showing the structure of the three-position switch module of Figure 2;

Figure 4 is a top plan view of the structure of the solid inlet and outlet module of Figure 2;

Figure 5 is a cross-sectional view taken along line A-A of Figure 4;

Figure 6 is a perspective side view of an embodiment of a solid insulated cabinet of the present invention.

detailed description

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

A specific embodiment of a solid insulated cabinet according to the present invention, as shown in FIGS. 1 to 6, the solid insulated cabinet is mainly composed of a main circuit 1 and a cabinet 2, wherein the main circuit 1 includes a bus bar module 11 and is broken. The module 12, the three-station module 13 and the incoming and outgoing line module 14 have four sub-modules, and the main circuit 1 component adopts a coaxial cylindrical shape to avoid electric field concentration.

The busbar module 11 serves as a busbar system of the solid insulated cabinet 2 for collecting and distributing a primary current, and is electrically connected to the breaking module 12 and the busbar module of the adjacent cabinet by means of interface insulation; the breaking module 12 may be a vacuum load switch or Circuit breaker for opening and closing load, short circuit current, and arc extinguishing The chamber is encapsulated by a solid insulating material; the three-station module 13 is a coaxial cylindrical electrode structure having a sealed air cavity, and the breaking module 12 and the three-station module 13 are connected by interface insulation.

3 is a specific structure of a three-position switch module. The three-station module 13 includes an isolated static contact 131, a movable contact 135, a grounding bar 138, a grounding static contact 139, an insulating sleeve 1311, and a transmission rack and pinion structure 1312. The conduction contact 1313, the sealing rubber pad 1314, the sealing plug 1315, the isolated static contact shielding ring 132 and the isolation floating shielding ring 133 disposed at the isolation fracture, and the conduction contact shielding ring 134 disposed at the conduction fracture And a conductive contact shielding ring 136, a ground floating shielding ring 137 and a grounding static contact shielding ring 1310 disposed at the grounding fracture. The isolation static contact 131, the ground static contact 139 and the conduction contact 1313 are respectively sleeved and connected with the movable contact 135, and are fixed by the insulating sleeve 1311 cast by the solid insulating material after the casting mold is positioned, and the solid after casting is formed. The three-position block module has a cylindrical shape and is provided with a cylindrical inner cavity. The two ends of the cylindrical inner cavity are respectively an isolated static contact 131 and a grounded static contact 139. The movable contact 135 is a circular tube structure, and the mating ends of the isolation static contact 131 and the ground static contact 139 and the movable contact 135 are both sleeve structures, and the movable contact 135 is sleeved to cooperate with the conductive, and the movable contact 135 is external. The tube wall is provided with a gear extending along the linear movement direction of the movable contact, and the solid-sealed three-station module is provided with a gear which cooperates with the rack to form the rack-and-pinion structure 1312, and the movable contact 135 and the transmission rack-and-pinion structure 1312 are installed. In the solid-sealed three-station module after casting, the movable contact 135 and the conduction contact 1313 are connected by spring fingers to form a dynamic conductive connection, and the transmission rack and pinion structure 1312 is driven by the three-station operating mechanism. The contact 135 moves up and down in a linear direction to complete switching of three working states of isolation, conduction and grounding. The sealing cover 1315 is used to block the solid-sealed three-position switch from the outside conduction to form a closed air cavity, so that the insulation level of the three-station module fracture is not affected by the external environment such as condensation and dust, and the three workers are improved. The reliability of the bit module. The grounding static contact 139 is electrically connected to the grounding bar 138 by bolting and is finally connected to the main grounding circuit of the cabinet 2.

By providing a high voltage, low voltage and floating potential shielding element conducting contact shielding ring 134, conducting contact shielding ring 136, grounding floating shielding ring 137, grounding static contact shielding ring 1310 to make the main circuit The high electric field strength region of the high voltage component to the ground is limited to the inside of the insulating sleeve 1311 with good dielectric properties to reduce the electric field strength assumed by the air, thereby satisfying the requirement of insulation performance with a small fracture distance, the coaxial cylindrical electrode and the shielding component. The use also improves the concentrated distribution of the electric field in the junction area of air, conductor and solid insulating material, thereby limiting the amount of partial discharge. The solid insulating materials described in this embodiment are all epoxy resins, and the surface of the solid insulating material is covered with an aluminum or semi-conductive coating by an electrophoretic coating technique, and is reliably grounded.

The incoming and outgoing line module 14 connects the current conducted from the busbar module 11 to the high voltage cable and accessories. 4 is a specific structure of the solid-sealed inlet and outlet module. The inlet and outlet module 14 is mainly composed of an insulating plug 141, a sealing rubber pad 142, a C phase in and out of the copper wire 143, a B phase in and out of the copper wire 144, and an A phase in and out of the copper wire. 145 is constructed of a solid insulating material 146. It can be seen from FIG. 4 that the A phase in and out copper bus line 145, the B phase in and out copper bus line 144, and the C phase in and out copper bus line 143 are encapsulated by a solid insulating material 146, and are guided by a bolt connection and a three-position switch. The through contact 1313 forms an electrically conductive connection, and converts the main circuit phase sequence of the busbar side from front to back to a phase sequence structure from left to right when viewed from the front of the cabinet, which is in accordance with the current use of the ring network power distribution switch device in the market. habit. In order to achieve full-sealing and full insulation, the insulating plug 141 and the sealing rubber pad 142 are used to block the exposed portion of the incoming and outgoing wire conductors, and the air should be discharged as much as possible during the sealing process, and a green grounding coating is applied on the outside of the insulating plug 141. Layer to achieve safe and reliable grounding of the enclosure.

As can be seen from FIG. 2, the breaking module 12 is connected below the bus bar module 11, the pole of the bus bar module 11 is located on the left side of the bus bar module 11, and the conduction contact 1313 of the three-station module 13 includes horizontal horizontal segments and vertical In the straight section, one end of the horizontal transverse section is sleeve-fitted with the movable contact, and the other end is connected with the vertical section. The breaking module 12 is located above the horizontal lateral section of the conduction contact 1313, and the vertical section of the conduction contact 1313 The lower extension is connected to the outlet module 14 located below the three-station module 12. By arranging the unipolar structure of the main circuit 1 from the bus bar module 11, the breaking module 12, the three-station module 13 and the incoming and outgoing line module 14 from top to bottom, from left to right, A, B, C three-phase poles The longitudinal arrangement from front to back makes the main circuit 1 compact, effectively reducing the width of the solid insulation cabinet and occupying the ground. product.

The cabinet 2 includes a pressure relief passage 21, a main circuit compartment 22, a cable compartment 23, a mechanism chamber 24, and an instrument room 25. The five functional compartments support and protect the corresponding main circuit, the main circuit is fixed in the main circuit compartment 22, and the pressure relief passage 21 is fixed on the left side in the longitudinal direction of the main circuit compartment 22, the instrument room 25, The mechanism chamber 24 and the cable chamber 23 are arranged on the right side in the longitudinal direction of the main circuit compartment from top to bottom, and the upper and lower longitudinal stacking structures are used between the functional compartments, and the functional compartments of the solid insulated cabinet are vertically arranged vertically. The cabinet width of the solid insulated cabinet is reduced to a greater extent, and the outer shell support and protection system of the solid insulated cabinet is formed from the bottom.

It can be seen from FIG. 1 that the main circuit structure of the switchgear cabinet is located in the main circuit compartment after being modularized as a whole, and the problem that the main circuit structure of the switchgear cabinet is located in a plurality of different compartments causes the structure of the main circuit to be not compact, the cabinet body is solved. Both the main circuit and the main circuit adopt a modular design. At the same time, the cabinet and the main circuit are arranged in a longitudinal direction, which effectively reduces the width of the solid insulated cabinet, and is convenient for assembly, debugging and maintenance, more compact structure, high modularity and integration. Saves floor space.

In other embodiments of the present invention, the main circuit may not adopt a modular design, and only the single-pole structures of each phase are laterally deployed, and the three-phase monopole structure is longitudinally arranged; the spring finger may also be The strap is a finger; the solid insulating material may also be an insulating rubber; the rack may also be disposed on the inner wall of the movable contact, and the gear is disposed in the movable contact, and is disposed on the movable contact There is a guiding hole for connecting the three-station transmission mechanism with the gear; the three-station module can also adopt a screw nut mechanism to drive the moving contact; the three-station module can also adopt other shapes of the coaxial motor When the rack is disposed on the movable contact, such as a square or the like, the movable contact may also be a flat shape, and the shape of the static contact and the conductive contact is adapted to the shape of the movable contact.

An embodiment of the main circuit of the fixed insulated cabinet: the structure of the main circuit of the fixed insulated cabinet is the same as that of the main circuit described in the embodiment of the solid insulated cabinet described above, and details are not described herein.

Thus, the main circuit of the solid insulated cabinet according to the embodiment of the present invention includes a three-phase unipolar structure, and the monopolar structures of the respective phases are laterally expanded, and the three-phase unipolar structure is vertically arranged, and the main circuit is The three-phase monopole structure of the road is laterally deployed and longitudinally arranged, which can reduce the cabinet width of the solid insulated cabinet, and solves the problem of the current wide size of the solid insulated cabinet.

Moreover, the single-pole structure of each phase comprises a busbar module, a three-station module, an inlet and outlet module, and a breaking module for opening and closing loads and short-circuit currents, which are laterally unfolded from top to bottom, and the modules are self-contained. The top-down lateral unfolding arrangement makes the main circuit compact, reduces the size and footprint of the solid insulation cabinet, and is convenient for disassembly and assembly. The three-station module has a coaxial cylindrical electrode structure for sealing the air cavity, which improves the reliability and stability of the air dielectric medium of the three-station switch fracture. The main circuit is encapsulated by an insulating material, and the outer shell of the insulating material is coated with a grounding layer, which reduces phase-to-phase and short-circuit faults to the ground, and is safe and reliable. The inlet and outlet line module comprises an insulating plug, a sealing rubber pad, and a main circuit phase sequence for distributing the busbar side from the front to the rear to convert the copper wire into and out of the phase sequence structure from the left to the right when viewed from the front of the cabinet. The incoming and outgoing copper cable is electrically connected to the conductive contact through the bolt, and the converted main circuit phase sequence conforms to the usage habit of the incoming and outgoing lines of the ring network power distribution switch device on the market. The cabinet comprises a pressure relief channel, a main circuit compartment, a cable room, a mechanism room and an instrument room, the main circuit is fixed in the main circuit compartment, and the pressure relief channel is fixed on the left side of the main circuit compartment in the longitudinal direction, the instrument room The mechanism room and the cable room are arranged on the right side of the main circuit compartment from the top to the bottom. By vertically arranging the functional compartments of the solid insulated cabinet body up and down, the cabinet width of the solid insulation cabinet is reduced to a greater extent. Dimensions, while bottom-up, form the housing support and protection system for solid insulated cabinets.

Industrial applicability

The main circuit of the solid insulation cabinet according to the embodiment of the invention comprises a three-phase monopole structure, the monopolar structures of the phases are laterally unfolded, and the three-phase monopole structure is arranged longitudinally, by making the three-phase monopole of the main circuit The structure is laterally unfolded and arranged longitudinally, which can reduce the cabinet width of the solid insulated cabinet, and solves the problem of the current wide size of the solid insulated cabinet.

Claims (10)

A main circuit of a solid insulated cabinet, the main circuit comprising a three-phase monopole structure, the single-pole structures of each phase are laterally expanded, and the three-phase monopole structure is longitudinally arranged. The solid insulated cabinet main circuit according to claim 1, wherein: said single-pole structure of each phase comprises a busbar module, a three-station module, an inlet and outlet module, and an opening and exiting module for top-down laterally unfolding, and for opening and closing loads, Breaking module for short circuit current. The main circuit of a solid insulated cabinet according to claim 2, wherein: said three-station module has a coaxial cylindrical electrode structure that seals the air chamber. The main circuit of the solid insulated cabinet according to claim 2 or 3, wherein: the three-station module comprises an isolated static contact, a conductive contact, a grounded static contact, a movable contact, and a movable contact respectively The isolated static contact, the conductive contact, the ground static contact dynamic conductive connection, the isolated static contact, the conductive contact, the ground static contact are fixedly connected by the cast insulating sleeve, and the movable contact is disposed inside the insulating sleeve and The conduction contact is electrically conductively connected, and the gear contact structure is connected to the movable contact for driving the movable contact to move up and down in a straight line to complete isolation, conduction and grounding under the driving of the three-station operating mechanism. A main circuit of a solid insulated cabinet according to any one of claims 1 to 3, wherein: said main circuit is encapsulated with an insulating material, and an outer casing of the insulating material is coated with a ground layer. A main circuit of a solid insulated cabinet according to any one of claims 1 to 3, wherein: said inlet and outlet line module comprises an insulating plug, a sealing rubber pad, and a main circuit phase sequence for distributing the busbar side from front to back. It is converted into an incoming and outgoing copper cable from the left to the right phase sequence structure viewed from the front of the cabinet body, and the incoming and outgoing copper wires are electrically connected with the conduction contacts. A solid insulated cabinet comprises a cabinet body and a main circuit, the main circuit comprises a three-phase monopole structure, the single-pole structures of each phase are laterally unfolded, and the three-phase monopole structure is arranged in a longitudinal direction. The solid insulated cabinet according to claim 7, wherein: each of the phase monopole structures comprises a bus bar module, a three-station module having a coaxial cylindrical electrode structure with a sealed air cavity, and an inlet and outlet line. The module and the breaking module for opening and closing the load and the short-circuit current, the bus bar module, the breaking module, the three-station module and the incoming and outgoing line module are laterally expanded from top to bottom. The solid insulated cabinet according to claim 7 or 8, wherein: said inlet and outlet module comprises an insulating plug, a sealing rubber pad, and a main circuit phase sequence for distributing the busbar side from front to back to be converted from the front of the cabinet. Looking at the copper wire from the left-to-right phase sequence structure, the copper wire and the inlet and outlet wires form an electrically conductive connection with the conduction contacts. The solid insulated cabinet according to claim 7 or 8, wherein: said cabinet comprises a pressure relief passage, a main circuit compartment, a cable compartment, a mechanism chamber and an instrument room, and the main circuit is fixed in the main circuit compartment, and the pressure is released. The channel is fixed to the left side in the longitudinal direction of the main circuit compartment, and the instrument room, the mechanism room, and the cable room are arranged from the top to the bottom in the longitudinal direction of the main circuit compartment.

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