CN107910801A - A kind of 220kV cable outlets HGIS devices - Google Patents

Abstract

The invention relates to a 220kV cable outgoing line HGIS device, which includes: an incoming line bushing, an inspection grounding switch, a disconnecting switch, a quick grounding switch, a three-position switch and cables arranged in a sulfur hexafluoride gas chamber and arranged from left to right Terminal parts; the incoming line end of the incoming line bushing is connected to the external AIS device, and the outgoing line end is respectively connected to the three-position switch through the maintenance grounding switch, isolating switch, and quick grounding switch; the three-position switch is also connected to the cable terminal part ; The cable terminal parts are respectively connected to the outlet ends of different groups of busbars in the station through 220kV cables. A 220kV cable outlet HGIS device proposed by the invention satisfies flexible requirements for outlets.

Description

A 220kV cable outlet HGIS device

technical field

The invention relates to a 220kV cable outlet HGIS device.

Background technique

At present, when the number of incoming and outgoing circuits of 220kV power distribution equipment in my country is greater than or equal to 15 or when the system requires it, double-busbar double-section wiring is basically used. Through the summary of the general design of the State Grid power transmission and transformation project, the layout types of the 220kV power distribution device include GIS equipment single row, HGIS equipment suspension pipe mother double row, AIS equipment support pipe mother double row, AIS equipment support pipe mother three row, AIS equipment There are 5 types of double rows of pipe nuts for equipment suspension. Except for the three rows of pipe nuts supported by AIS equipment, which can realize two directions of outgoing lines, the rest of the layout methods are one direction of outgoing lines. All layout types adopt herringbone column steel structure.

With the improvement of the safety requirements of the power grid, the wiring of most 500kV substations and 220kV substations for 220kV power distribution devices needs to consider that a group of 220kV busbars will be caused by a busbar failure during maintenance or failure of the other busbar (I/IIM is a group of busbars, III/IVM is a group of busbars) under the fault mode of complete stop (N-2 fault), to avoid the occurrence of serious accidents in which the 220kV ring network is completely lost, it is required that the 220kV lines with the same name should be arranged in different groups of busbars as much as possible.

At present, the layout scheme of the 220kV power distribution device has two sets of busbars, except that the AIS equipment supports the three-column layout of the tube busbars, and the rest are one-word extended layouts. It is required that 220kV lines with the same name are arranged on different busbars. The commonly used method is to use the 220kV cable crossover scheme for 220kV lines with the same name to meet the flexible outgoing requirements for 220kV lines with the same name to be arranged on different busbars. Since most of the original AIS intervals use overhead cables, the solution of adding cable terminals and cable channels directly outside the original AIS equipment needs to occupy a lot of space in the station, and if the space in the reconstruction station is insufficient, this solution cannot be realized.

Contents of the invention

The purpose of the present invention is to provide a 220kV cable outlet HGIS device to overcome the defects in the prior art.

In order to achieve the above object, the technical solution of the present invention is: a 220kV cable outlet HGIS device, which includes: the inlet bushing, the maintenance grounding switch, the isolating switch, the fast grounding switch, three-position switch, and cable terminal parts; the incoming line end of the incoming line sleeve is connected to the external AIS device, and the outgoing line end is respectively connected to the grounding switch, the isolation switch, and the quick grounding switch The three-position switch; the three-position switch is also connected to the cable terminal part; the cable terminal part is respectively connected to the outlet terminals of different groups of busbars in the station through 220kV cables arranged in the cable channel.

In an embodiment of the present invention, the three-position switch is also respectively connected to a voltage transformer and a lightning arrester arranged on a base from left to right and located at the lower end of the three-position switch; the voltage transformer and the lightning arrester are both Set in the sulfur hexafluoride gas chamber.

In an embodiment of the present invention, it also includes a high-voltage charging display device arranged on the base.

Compared with the prior art, the present invention has the following beneficial effects:

1) Multiple lines with the same name can be arranged on different sides of the section, which can be a good solution to the current 500kV substation when two bus sections of the 220kV four-section busbars are faulty or one section of the busbar is overhauled and the other section of the busbar is faulty (N-2 fault). There are hidden dangers that multiple 220kV substations will stop completely or the lines will be seriously overloaded, which will cause large-scale power outages.

2) To connect the line with the same name to the opposite side of the segment by using the scheme of adding cable terminals, it is necessary to add a cable terminal and the corresponding cable tunnel space, which cannot meet the requirements when the space in the original AIS station is insufficient, and the 220kV cable applied for by this patent is adopted To get out of the HGIS, the corresponding AIS equipment in the original AIS interval can be removed, and the HGIS equipment and cable tunnel can be placed. The HGIS equipment has the characteristics of small footprint, which can reduce the 10.5m under the original AIS scheme to within 5m under the HGIS scheme. Compared with the cable terminal scheme, the footprint is reduced by more than 50%.

3) The modified device does not involve the circuit breaker and current transformer close to the busbar in the original compartment, and the cost is reduced by more than 60% compared with the full compartment HGIS equipment; The impact of equipment in the station can be reduced to a minimum.

4) Cable outlets are used, which is more flexible than conventional overhead casing-type outlets for HGIS equipment, and has lower requirements for the station site, which is conducive to the adjustment of outlets in the station.

5) The overall equipment is neat, symmetrical, and beautiful, and the layout of equipment and wires is more concise and clear. The road design is reasonable and can meet the requirements of transportation, operation, maintenance, inspection, etc. The original layout plan is slightly changed, and only 220kVHGIS equipment is added The cost and the dismantling cost of the original AIS equipment will not increase the land used in the substation.

Description of drawings

Fig. 1 is a schematic structural diagram of a 220kV cable outlet HGIS device in an embodiment of the present invention.

Fig. 2 is an electrical connection diagram of a 220kV cable outlet HGIS device in an embodiment of the present invention.

Detailed ways

The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

The present invention provides a 220kV cable outlet HGIS device, as shown in Fig. 1 to Fig. 2, which includes: a line inlet bushing 1, an inspection grounding switch 2, an isolator 3 off, fast grounding switch 4, three-position switch 5 and cable terminal part 9; the incoming line end of the incoming line bushing 1 is connected to the external AIS device, and the outgoing line end is respectively inspected by the grounding switch 2, the isolating switch 3, and the fast grounding switch 4 is connected to the three-position switch 5; the three-position switch is also connected to the cable terminal part 9; the cable terminal part is respectively connected to the outlets of different groups of busbars in the station through the 220kV cables set in the cable channel.

Further, in this embodiment, the three-position switch is also connected to the voltage transformer 6 and the lightning arrester 7 which are sequentially arranged on a base 10 from left to right and located at the lower end of the three-position switch; the voltage transformer and the lightning arrester are both Set in the sulfur hexafluoride gas chamber. A three-position isolating grounding switch is installed in front of the surge arrester and voltage transformer to save floor space.

Further, in this embodiment, a high-voltage charging display device 8 provided on the base is also included.

Furthermore, in this embodiment, it also includes a control cabinet matching the HGIS device and related framework components.

Further, in this embodiment, sulfur hexafluoride gas is used as the insulating medium, and the electrically connected components are enclosed in the gas chamber of the insulating gas.

Further, in this embodiment, the external AIS device is connected to the wire inlet bushing through flexible wires, and the external AIS device is a current transformer.

The above are the preferred embodiments of the present invention, and all changes made according to the technical solution of the present invention, when the functional effect produced does not exceed the scope of the technical solution of the present invention, all belong to the protection scope of the present invention.

Claims (3)

1. a kind of 220kV cable outlets HGIS devices, it is characterised in that including being arranged in sulfur hexafluoride air cell and from left to right Set：Entrance bushing, inspection earthing switch, disconnecting switch, high speed grounding switch, three-station and cable termination portion Part；The end of incoming cables of the entrance bushing is connected with outside AIS devices, leading-out terminal respectively through the inspection earthing switch, it is described every Leave pass, the high speed grounding switch is connected to the three-station；The three-station also with the cable termination portion Part is connected；The configured 220kV cables in cable passage of the cable termination component connect respectively is connected to different group mothers in station The leading-out terminal of line.

A kind of 2. 220kV cable outlets HGIS devices according to claim 1, it is characterised in that the three-station Also respectively with being set in turn in from left to right on a base and positioned at the voltage transformer and arrester of three-station lower end It is connected；The voltage transformer and arrester may be contained within the sulfur hexafluoride air cell.

3. a kind of 220kV cable outlets HGIS devices according to claim 2, it is characterised in that further include and be arranged at institute State the high voltage display device on base.