CN105048330B - A kind of new arrangement structure of gas-insulated switchgear device - Google Patents

Abstract

The invention relates to a new layout structure of gas insulated switchgear, which includes several complete strings, each complete string includes: six main busbars, the first main busbar, the second main busbar and the third main busbar respectively represent A and B , C three-phase, the fourth main bus, the fifth main bus and the sixth main bus respectively represent three phases A, B and C; three branch circuits, each of which includes three circuit breakers and six isolating switches; each The three circuit breakers in one branch are arranged vertically with respect to the main bus bar, and the three circuit breakers are connected in series in sequence, and a disconnector is connected in series at both ends of each circuit breaker, and the disconnectors located at the two ends of the three branch circuits respectively Correspondingly connect the three phases A, B, and C of the six main buses; on each branch, a pair of adjacent isolating switches connected in series is connected to the outgoing line or incoming line, and the other pair is adjacent and connected in series. The branch between the two isolating switches connected in series is connected to the incoming line or the outgoing line accordingly. The present invention can effectively save floor space and improve economic benefits under the condition that the number of incoming lines and outgoing lines is equal.

Description

A New Arrangement Structure of Gas Insulated Switchgear

technical field

The invention relates to the field of electric power engineering, in particular to a novel arrangement structure of a gas insulated switchgear.

Background technique

At present, gas-insulated switchgear is widely used in substations in the electric power industry. Gas-insulated switchgear is to completely or partially enclose high-voltage electrical appliances such as busbars, circuit breakers, isolating switches, voltage transformers, current transformers, lightning arresters, and busbar grounding switches. Assemblies in metal pressure-tight containers containing an insulating gas at a pressure higher than atmospheric pressure. In general, gas insulated switchgear uses sulfur hexafluoride gas with excellent insulation performance and arc extinguishing performance as the insulating gas and arc extinguishing medium. The bus bar is the conductor that connects the current-carrying branch circuits in the gas insulated switchgear. The charging current of the gas insulated switchgear; the circuit breaker used in the gas insulated switchgear is usually a high voltage circuit breaker. The high voltage circuit breaker is the main power control device in the gas insulated switchgear. Connect the no-load and load current of the line and various electrical devices; when the system fails, it can quickly cut off the fault current to prevent the expansion of the scope of the accident.

Compared with the traditional open power distribution device, the gas insulated switchgear has the advantages of small footprint, all components are sealed without environmental interference, high operational reliability, convenient operation, long maintenance cycle, small maintenance workload, Quick installation, low operating costs, no electromagnetic interference and other advantages. In order to achieve a wider range of optimal allocation of resources, promote efficient energy development and utilization, and promote sustainable economic and social development, my country has accelerated research on UHV power transmission and transformation technology and constructed UHV power transmission and transformation projects. The existing 1000kV GIS (Gas-insulated Metal-enclosed Switchgear, gas-insulated switchgear) layout adopts a straight line layout, that is, the circuit breaker is parallel to the busbar and is arranged in a straight line, but the number of incoming and outgoing lines is equal. Under normal circumstances, the lateral width of the 1000kV power distribution device area is difficult to match with the 1000kV outgoing line structure, which makes it difficult to meet the requirements of the general layout, which in turn causes problems such as excessively large occupied areas to varying degrees and poor economic benefits.

Contents of the invention

In view of the above problems, the purpose of the present invention is to provide a new layout structure of gas insulated switchgear that can effectively save floor space and improve economic benefits when the number of incoming and outgoing lines is equal.

In order to achieve the above technical purpose, the present invention adopts the following technical solutions: a new layout structure of gas insulated switchgear, the layout structure includes several complete strings connected in series, and each complete string includes: six horizontally arranged main busbars , the six main buses are respectively the first to sixth main buses, wherein, the first main bus, the second main bus and the third main bus represent three phases A, B and C respectively, and the fourth main bus , the fifth main bus and the sixth main bus represent three phases of A, B and C respectively; three branch circuits, each of which includes three circuit breakers and six isolating switches; The three circuit breakers are arranged vertically relative to the main bus bar respectively, and the three circuit breakers are connected in series in sequence, and each of the two ends of the circuit breaker is connected in series with a disconnector, which are respectively located in the three lines. The isolating switches at both ends of the branch are correspondingly connected to the three phases A, B, and C of the six main buses; each branch includes two pairs of adjacent isolating switches connected in series, one of which is Connect the outgoing line or incoming line to the branch between the two adjacent isolating switches connected in series, and connect the branch between the other two adjacent and in series isolating switches accordingly The incoming line or the outgoing line.

Each of the circuit breakers is arranged in a single row on one side of the incoming line.

Due to the adoption of the above technical solutions, the present invention has the following advantages: 1. Since the present invention arranges each circuit breaker vertically with the main bus bar, the occupied area can be effectively saved when the number of incoming and outgoing lines is equal. Improve economic efficiency. 2. The invention arranges the circuit breakers in a single row on the incoming line side, which not only facilitates installation and maintenance, but also effectively improves the flexibility of the outgoing line direction and saves the length of the branch bus. The invention occupies a small area and has low cost, and can be widely used in the arrangement structures of various insulating switches.

Description of drawings

Fig. 1 is a schematic plan view of the internal arrangement of the present invention.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the novel layout structure of the gas insulated switchgear provided by the present invention includes several complete strings 1 connected in series, wherein the number of complete strings 1 is determined according to actual needs, and is not limited here; each The complete string 1 includes six main buses and three branches arranged horizontally;

The six main busbars are the first main busbar 11, the second main busbar 12, the third main busbar 13, the fourth main busbar 14, the fifth main busbar 15 and the sixth main busbar 16, wherein the first main busbar 11, the sixth main busbar The second main bus 12 and the third main bus 13 respectively represent the three phases A, B and C, and the fourth main bus 14, the fifth main bus 15 and the sixth main bus 16 represent the three phases A, B and C respectively;

The three branches are respectively the first branch 21, the second branch 22 and the third branch 23, and each branch includes three circuit breakers 3 and six disconnectors 4; three circuit breakers in each branch The breakers 3 are arranged vertically relative to the main bus bar respectively, and the three circuit breakers 3 are connected in series sequentially, and a disconnector 4 is connected in series at both ends of each circuit breaker 3, and each branch includes two pairs of adjacent and connected in series The isolating switch 4 together, wherein, the branch between a pair of adjacent and serially connected isolating switches 4 is connected to the outgoing line 5 or incoming line 6, and the other pair of adjacent and serially connected together The branches between the isolating switches 4 are correspondingly connected to the incoming line 6 or the outgoing line 5;

The isolating switches 4 located at both ends of the first branch 21 are respectively connected to the first main bus 11 and the fourth bus 14; the isolating switches 4 located at both ends of the second branch 22 are respectively connected to the second main bus 12 and the fifth main bus 15 ; The disconnectors 4 located at both ends of the third branch 23 are respectively connected to the third main bus 13 and the sixth main bus 16 .

In a preferred embodiment, in order to improve the flexibility of the outgoing line direction, save the length of the branch busbar, and facilitate installation and maintenance, each circuit breaker 3 is arranged on one side of the incoming line 6 in a single row; each circuit breaker 3 Horizontal fracture type circuit breakers can be used.

In a preferred embodiment, each isolating switch 4 can be a vertical or horizontal break type isolating switch.

The floor area savings of the new layout structure of the gas insulated switchgear of the present invention will be described in detail below through specific embodiments:

Taking a typical 1000kV substation as an example, the 1000kV power distribution device of the substation needs to be equipped with six sets of incoming lines 6 and six sets of outgoing lines 5, so six complete strings 1 need to be set;

If the conventional one-shaped layout structure in the prior art is adopted, the maximum total length of the gas insulated switchgear is 74.5×6=447m, the total length of the outlet frame is 51×6+16=322m, and the length of the distribution device area The larger of the two needs to be considered, which is 447m, and the width of the power distribution device area is 57m, so the area occupied by the power distribution device is about 2.5479 hectares;

If the novel layout structure of the gas insulated switchgear of the present invention is adopted, the total length of the gas insulated switchgear is 54×6=324m, the total length of the outlet frame is 51×6+16=322m, and the length of the power distribution device area needs to be It is the larger of the two, which is 324m, and the width of the power distribution device area is 60m, so the area occupied by the power distribution device is about 1.944 hectares. It is obvious that the novel layout structure of the gas insulated switchgear of the present invention effectively saves the occupied area and saves the economic cost.

The foregoing embodiments are only used to illustrate the present invention, wherein the structure, connection mode and manufacturing process of each component can be changed to some extent, and any equivalent transformation and improvement carried out on the basis of the technical solution of the present invention should not be excluded. Outside the protection scope of the present invention.

Claims (1)

1. A novel layout structure of a gas insulated switchgear, characterized in that: the layout structure includes a number of complete strings connected in series, and each of the complete strings includes: Six horizontally arranged main buses, the six main buses are respectively the first to sixth main buses, wherein the first main bus, the second main bus and the third main bus respectively represent three phases A, B and C, The fourth main bus, the fifth main bus and the sixth main bus respectively represent three phases of A, B and C; Three branch circuits, each of which includes three circuit breakers and six isolating switches; three circuit breakers in each of the branch circuits are vertically arranged relative to the main bus, and three The circuit breakers are sequentially connected in series, and the two ends of each circuit breaker are connected in series with one of the isolating switches, and the isolating switches located at the two ends of the three branches are respectively connected to the A and B of the six main buses. , C three-phase; each branch includes two pairs of adjacent isolating switches connected in series, wherein the branch between a pair of adjacent isolating switches connected in series Connect the outgoing line or the incoming line, and the branch between the two adjacent isolating switches connected in series connects the incoming line or the outgoing line accordingly; each of the circuit breakers is arranged in a single row on the side of the incoming line.