CN205657374U - Solid insulation boundary switch cabinet - Google Patents

Abstract

The utility model discloses a solid insulation boundary switchgear, which comprises a vacuum circuit breaker unit, a voltage transformer unit, a zero-sequence current transformer, end sealing plates on both sides, and a boundary controller installed on the voltage transformer unit. The voltage transformer unit and the vacuum circuit breaker unit are electrically connected with the busbar. All devices in the voltage transformer unit and the vacuum circuit breaker unit are fixed and insulated, and all plugs are shielded and touchable plugs. Both the vacuum circuit breaker unit and the vacuum circuit breaker unit are solid-insulated, and the two units are also electrically connected by a solid-insulated busbar. The whole set of switchgear has no exposed charged body, which has better insulation performance and resistance to harsh environments; at the same time, the voltage transformer adopts The hoisting method expands the cable connection space, enables the voltage transformer and the first three-position isolating switch to be installed in the same switch cabinet, and reduces the volume of the switch cabinet.

Description

A solid insulation boundary switch cabinet

technical field

The utility model relates to the field of power grid power distribution systems, in particular to a solid insulation boundary switch cabinet.

Background technique

With the new requirements of the smart grid power distribution system for the urban network, some living quarters, commercial areas, and areas with large power loads must be equipped with user boundary switch equipment. For the 10kV cable network power distribution system, it is mainly The purpose of installing various user boundary switch cabinets is to protect the normal power supply of various places and not affect the power consumption of adjacent areas under the premise of failure; domestic boundary switch cabinet equipment mainly includes vacuum circuit breakers, isolating switches, and current transformers Most of the electrical components such as voltage transformers and boundary controllers are air-insulated, and the size of the cabinet is relatively large, and the charged body is exposed, which is eroded by air and dust, which may easily cause corrosion of the charged body, reduce the insulation level, and shorten the service life. , which has a great hidden danger to the operation of the equipment. At present, there are also boundary switchgears that use SF6 gas insulation, but SF6 gas is a greenhouse gas. Due to environmental protection requirements, its application is being more and more restricted; at the same time, the use of SF6 gas insulation equipment also involves sealing The leakage of the box affects the reliability of the equipment.

Contents of the invention

In order to overcome the disadvantages of the above-mentioned prior art, the utility model provides a boundary switchgear adopting solid full insulation.

In order to achieve the above object, the technical solution adopted by the utility model is:

A solid insulation boundary switchgear, comprising a vacuum circuit breaker unit, a voltage transformer unit, end sealing plates on both sides, and a boundary controller installed on the voltage transformer unit, the voltage transformer unit and the vacuum circuit breaker unit pass through The electrical connection of the busbar is characterized in that all devices in the voltage transformer unit and the vacuum circuit breaker unit are solid insulating structures, and all plugs are shielded and touchable plugs.

As a further improvement of the above solution, the voltage transformer unit includes a cabinet, a first three-position isolating switch, a voltage transformer and a zero-sequence current transformer, and the first three-position isolating switch has an incoming line end and an outgoing line end A European-style cable bushing is provided, and the outlet end of the first three-position isolating switch is electrically connected to the bus-bar connector of the vacuum circuit breaker unit through the bus joint and bus connector in the European-style cable bushing; the incoming line ends are respectively passed through the European-style cable The front plug of the first European cable in the bushing and the PT connecting cable are electrically connected to the voltage transformer, and connected to the high voltage cable through the rear plug of the first European cable in the European cable bushing.

As a further improvement of the above solution, the voltage transformer is hoisted in the cabinet through a bracket.

As a further improvement of the above solution, the voltage transformer is a fully insulating structure casted by epoxy resin.

As a further improvement of the above scheme, the high-voltage primary live side of the voltage transformer is provided with an American-style cable bushing, and the American-style cable bushing is provided with a high-voltage exposed charged body and a high-voltage fuse. American elbow-shaped cable plug joint, the high-voltage exposed charged body is connected to the high-voltage cable through a high-voltage fuse.

As a further improvement of the above scheme, the vacuum circuit breaker unit includes a cabinet body, a vacuum circuit breaker, a current transformer and a second three-position isolating switch, and the inlet and outlet ends of the vacuum circuit breaker are provided with European-style cable bushings , the incoming line end is electrically connected to the bus bar connector of the voltage transformer unit through the busbar connector in the European-style cable bushing; the outgoing line end is connected to the high-voltage cable through the second European-style cable in the cable bushing. on high voltage cables.

As a further improvement of the above solution, the zero-sequence current transformer is installed at the bottom of the voltage transformer cabinet, and the zero-sequence current transformer is sleeved on the high-voltage cable.

As a further improvement of the above solution, the vacuum circuit breaker adopts solid insulation.

The beneficial effects of the utility model:

The solid insulation boundary switchgear of the utility model adopts solid insulation through the voltage transformer unit and the vacuum circuit breaker unit, and the solid insulation busbar is also used for electrical connection between the two units. The whole set of switchgear has no exposed charged body and has better performance Excellent insulation performance and resistance to harsh environments. At the same time, the voltage transformer adopts hoisting method, which expands the cable connection space, enables the voltage transformer and three-position isolating switch to be installed in the same switch cabinet, and reduces the volume of the switch cabinet.

Description of drawings

Fig. 1 is the structural representation of the preferred embodiment of the utility model;

Fig. 2 is the structural representation of the voltage transformer unit of the preferred embodiment of the utility model;

Fig. 3 is a schematic structural diagram of a vacuum circuit breaker in a preferred embodiment of the present invention.

detailed description

Below in conjunction with accompanying drawing and preferred embodiment of the present utility model, the utility model is further described:

Referring to Figure 1, a solid insulation boundary switchgear includes a vacuum circuit breaker unit 1, a voltage transformer unit 2, end sealing plates 4 on both sides, and a boundary controller 3 installed on the voltage transformer unit. Unit 2 and vacuum circuit breaker unit 1 are electrically connected through a busbar. All devices in voltage transformer unit 2 and vacuum circuit breaker unit 1 are of fixed insulation structure, and all plugs are shielded and touchable plugs.

Fig. 2 is a structural schematic diagram of a voltage transformer unit, which includes a cabinet body 213, a first three-position isolating switch 29, a voltage transformer 27 and a zero-sequence current transformer 26, and the first three-position isolating switch European-style cable bushings 22 and 23 are provided at the inlet and outlet ends on 29, and the outlet terminals of the first three-position isolating switch 29 pass through the busbar joint 211 and busbar connector 212 in the European-style cable bushing and the busbar of vacuum circuit breaker unit 1 in sequence. The joints are electrically connected; the incoming line ends are electrically connected to the voltage transformer 2 through the first European cable front plug 22 and the PT connecting cable in the European cable casing, and are connected to the high voltage through the first European cable rear plug 23 in the European cable casing. Incoming cable 24, the voltage transformer 2 is hoisted into the cabinet through the bracket, which expands the cable connection space, enables the voltage transformer 2 and the first three-position isolating switch 29 to be installed in the same switch cabinet, and reduces the size of the switch cabinet volume of. The first three-position isolating switch 29 includes an observation window, which is used to observe the position state of the isolating switch, and the observation window can be provided with an LED spotlight.

The voltage transformer 2 is poured with epoxy resin to form a fully insulating structure. The voltage transformer 2 is provided with an American-style cable bushing on the high-voltage primary live side, and the American-style cable bushing is provided with a high-voltage exposed charged body and a high-voltage fuse. , the high-voltage exposed charged body is connected to the high-voltage cable 14 through a high-voltage fuse.

Referring further to Fig. 3, the vacuum circuit breaker unit 1 includes a cabinet body 110, a solid-insulated vacuum circuit breaker, a current transformer 15 and a second three-position isolating switch, and the inlet and outlet ends of the vacuum circuit breaker are provided with European-style cable sleeves The incoming line end is electrically connected to the bus bar connector of the voltage transformer unit 2 through the busbar connector in the European-style cable casing; the outgoing line end is connected to the high-voltage cable through the second European-style cable front plug 12 in the cable casing, and the current transformer 15 sleeves are set on the high voltage cable.

The zero-sequence current transformer 25 is installed at the bottom of the voltage transformer cabinet 213 and installed on the cable bushing, and the high-voltage cable passes through the opening of the zero-sequence current transformer 26 . The first three-position isolating switch 29, the second three-position isolating switch and the vacuum circuit breaker 1 adopt solid insulation. All cable plugs are shielding touchable type, and the first and second European cable front plugs 12, 22, the first European cable rear plug 23 and the American elbow cable plug 25 are all shielding touchable plugs.

The voltage transformer unit 2 and the vacuum circuit breaker unit 1 both adopt solid insulation, and the two units are also electrically connected by a solid insulating busbar. The whole set of switchgear has no exposed charged body, and has better insulation performance and resistance to harsh environments. At the same time, the voltage transformer 2 is hoisted, which expands the cable connection space, enables the voltage transformer and the first three-position isolating switch to be installed in the same switch cabinet, and reduces the volume of the switch cabinet. The boundary controller 3 collects the voltage signal from the voltage transformer 2 and obtains the operating power, collects the current signal from the current transformer 15 and the zero-sequence current transformer 26, and performs status monitoring and fault judgment, and executes commands through the vacuum circuit breaker Operation to realize the monitoring and protection function of the system.

The above is a specific description of the preferred embodiments of the present utility model, but the utility model creation is not limited to the described embodiments, and those skilled in the art can also make various equivalents without violating the spirit of the present utility model. Modifications or replacements, these equivalent modifications or replacements are all included within the scope defined by the claims of the present application.

Claims (8)

1. a solid insulation demarcation switch cabinet, including vacuum circuit breaker unit, voltage transformer unit, the end-plate of both sides and the boundary controller being arranged on voltage transformer unit, described voltage transformer unit is electrically connected with by bus with vacuum circuit breaker unit, it is characterized in that: in voltage transformer unit and vacuum circuit breaker unit, all devices are all solid insulation structures, all plugs are all shielding tangible plug.

A kind of solid insulation demarcation switch cabinet the most according to claim 1, it is characterized in that: described voltage transformer unit includes cabinet, the first tri-station isolating switch, voltage transformer and zero sequence current mutual inductor, described first tri-station isolating switch end of incoming cables and leading-out terminal are provided with European cable sleeve, and described first tri-station isolating switch leading-out terminal passes sequentially through the busbar joint electric connection of the busbar joint in European cable sleeve and bus tie and vacuum circuit breaker unit；End of incoming cables connects cable by plug before the first European cable in European cable sleeve and PT respectively and is electrically connected with voltage transformer, is connected with high tension cable by plug after the European cable of first in European cable sleeve.

A kind of solid insulation demarcation switch cabinet the most according to claim 2, it is characterised in that: described voltage transformer is by support lifting and cabinet.

A kind of solid insulation demarcation switch cabinet the most according to claim 2, it is characterised in that: described voltage transformer is all insulation structure that poured with epoxy resin becomes.

A kind of solid insulation demarcation switch cabinet the most according to claim 2, it is characterized in that: the described the most charged side of voltage transformer high pressure is provided with American cable sleeve, the exposed electrical body of high pressure and high-tension fuse it is provided with in described American cable sleeve, being arranged with American elbow cable connector head on described American cable sleeve, the exposed electrical body of described high pressure is connected with high tension cable by high-tension fuse.

A kind of solid insulation demarcation switch cabinet the most according to claim 1, it is characterized in that: described vacuum circuit breaker unit includes cabinet, vacuum circuit breaker, current transformer and the second tri-station isolating switch, described vacuum circuit breaker end of incoming cables and leading-out terminal are provided with European cable sleeve, and end of incoming cables is electrically connected with by the busbar joint of the bus tie in European cable sleeve with voltage transformer unit；Leading-out terminal is connected with high tension cable by inserting before the second European cable in cable sleeve, and described current transformer is set on high tension cable.

A kind of solid insulation demarcation switch cabinet the most according to claim 2, it is characterised in that: described zero sequence current mutual inductor is arranged on bottom voltage transformer cabinet, and described zero sequence current mutual inductor is set on high tension cable.

A kind of solid insulation demarcation switch cabinet the most according to claim 6, it is characterised in that: described vacuum circuit breaker uses solid insulation.