CN110729635A - A gas-insulated metal-enclosed switchgear - Google Patents

Abstract

The invention relates to a gas-insulated metal-enclosed switchgear, comprising three GIS single-phases, and the main busbars of each GIS single-phase include a first main busbar and a second main busbar extending in the left-right direction, and the first main busbar is powered on. A first branch busbar is connected, and a second branch busbar is electrically connected to the second main busbar. The first branch busbar and the second branch busbar are respectively provided with a first outlet end and a second outlet end. A first circuit breaker is arranged between the outlet ends, a second circuit breaker is arranged between the second main busbar and the second outlet end, the first circuit breakers of each GIS single-phase are arranged side by side along the left-right direction, and each GIS single-phase is arranged in parallel. The first circuit breaker of each GIS is located on the front or rear side of each main bus; the second circuit breakers of each GIS single-phase are arranged side by side in the left-right direction, and the second circuit breaker of each GIS single-phase is located on the front or rear of each main bus. rear side. The invention solves the problem that the corresponding circuit breakers between the three phases are distributed and arranged along the main busbar in the prior art, resulting in a larger overall width of the GIS.

Description

A gas-insulated metal-enclosed switchgear

technical field

The present invention relates to gas-insulated metal-enclosed switchgear in the field of power transmission.

Background technique

The 330kV substation is generally responsible for multiple tasks such as collecting electric energy, redistributing loads, and transmitting power in the northwest power grid system, and its status in the northwest power grid transmission system is very critical. At the same time, as the unique voltage level of the Northwest Power Grid, it undertakes the important task of power transmission from the west to the east, which is related to the smooth operation of the entire Northwest Power Grid. At present, the main wiring form used by 330kV GIS (ie, gas-insulated metal-enclosed switchgear) is mostly double-bus connection. Although the double bus connection can repair the bus system through the switch-off operation without affecting the power supply, it is easy to cause serious consequences due to misoperation. At the same time, when a group of busbars fails or is overhauled, half of the circuit power supply will be interrupted, which is not allowed for large-capacity power plants and hub substations.

The current 3/2 wiring form can solve this problem very well. This wiring form is as disclosed in the Chinese patent CN103633567B, "the wiring arrangement structure of the GIS power distribution device". The wiring arrangement structure includes three GIS single Each GIS single-phase includes a first main busbar and a second main busbar, a branch busbar is connected between the first main busbar and the second main busbar, and three circuit breakers are arranged on the branch busbar at intervals, two adjacent to each other. Outgoing terminals are arranged between the circuit breakers for connection with the corresponding power supply circuit. In this way, during normal operation, two sets of busbars are running at the same time. When any busbar or circuit breaker needs to be repaired, as long as the corresponding busbar is disconnected, each power supply circuit will still work normally, ensuring that no power supply circuit is interrupted. However, the existing GIS still has the following problems. The layout of the components in each GIS single-phase is unreasonable. For each corresponding two main busbars, six main busbars need to be set for the three-phase, and the main busbars are arranged side by side. As a result, the layout of the main bus takes up a lot of space. In addition, the circuit breakers corresponding to each branch bus are arranged parallel to the main bus, which will also increase the occupied width of the entire GIS; in addition, the setting position of the outlet end is relatively simple. , can not meet the requirements of various use environments; the air chamber of the branch busbar is directly connected to the air chamber of the main busbar, and the air chamber of the main busbar may be affected during the maintenance of the branch busbar or the long-term equipment expansion.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a gas-insulated metal-enclosed switchgear, so as to solve the problem that the existing three groups of circuit breakers are all arranged parallel to the main busbar, resulting in a larger overall width of the GIS.

In order to solve the above problems, the technical scheme of the gas-insulated metal-enclosed switchgear provided by the present invention is:

A gas-insulated metal-enclosed switchgear includes three GIS single-phases, the main busbars of each GIS single-phase include a first main busbar and a second main busbar extending in the left-right direction, and a second main busbar is electrically connected to the first main busbar. a branch bus, the second main bus is electrically connected to the second branch bus, the first branch bus is provided with a first outlet end, the second branch bus is provided with a second outlet end, and the first branch bus is connected to the first main bus A first circuit breaker is arranged between the busbar and the first outlet end, and a second circuit breaker is arranged between the second main busbar and the second outlet end on the second branch busbar. The directions are arranged side by side, the first circuit breaker of each GIS single-phase is located on the front side or the rear side of each main bus; Circuit breakers are located on the front or rear of each main bus.

The first circuit breaker of each GIS single-phase and the second circuit breaker of each GIS single-phase are located on the same side of each main bus, and the second circuit breaker of each GIS single-phase is located on the right side of the first circuit breaker of each GIS single-phase , the first circuit breaker and the second circuit breaker are vertical circuit breakers arranged in parallel.

Each GIS single-phase further includes a third circuit breaker connected in series between the first branch busbar and the second branch busbar, the third circuit breaker is located between the first outlet end and the second outlet end of the corresponding GIS single phase, each GIS The third single-phase circuit breakers are arranged side by side in the left-right direction, the third circuit breakers of each GIS single-phase are located on the right side of the first circuit breaker of each GIS single-phase, and the second circuit breaker of each GIS single-phase is on the right side. On the left, the third circuit breaker is a vertical circuit breaker arranged in parallel.

A first branch gas barrier insulator is arranged at the connection between the first main busbar and the first branch busbar, and a second branch gas barrier insulator is arranged at the connection between the second main busbar and the second branch busbar.

The upper end of the first circuit breaker is provided with a first isolation grounding device, the lower end of the first circuit breaker is provided with a second isolation grounding device; the lower end of the third circuit breaker is provided with a third isolation grounding device, and the upper end of the third circuit breaker is provided with a third isolation grounding device. the fourth isolation grounding device; the upper end of the second circuit breaker is provided with a fifth isolation grounding device, the lower end of the second circuit breaker is provided with a sixth isolation grounding device, and the first branch busbar includes a connection between the first main busbar and the first isolation grounding device. The first connection part of the first branch busbar between the devices and the second connection part of the first branch busbar extending in the left-right direction between the second isolation grounding device and the third isolation grounding device; The first connection part of the second branch busbar between the second main busbar and the sixth isolation grounding device and the second connection of the second branch busbar extending in the left-right direction connected between the fourth isolation grounding device and the fifth isolation grounding device part.

The first outlet end is arranged on the second connection portion of the first branch bus bar, and the second outlet end is arranged on the second connection portion of the second branch bus bar.

The first outlet end is connected to the right end of the third isolation grounding device; the second outlet end is connected to the left end of the fourth isolation grounding device.

The first outlet end is connected to the left end of the second isolation grounding device; the second outlet end is connected to the right end of the fifth isolation grounding device.

The first main busbar and the second main busbar of each GIS single-phase are arranged side by side at intervals up and down, and the main busbars of each GIS single-phase are arranged side by side at intervals along the front-rear direction.

In the height direction, the first branch busbar, the second branch busbar, the first circuit breaker, and the second circuit breaker of each GIS single-phase are located between the first main busbar and the second main busbar.

The beneficial effects of the present invention are as follows: in the present invention, the first circuit breakers of each GIS are arranged side by side along the left and right directions on the front side or the rear side of each main bus, and the second circuit breakers of each GIS are arranged side by side along the left and right directions. On the front side or rear side of each main busbar, the circuit breaker is arranged on one side of the main busbar, so that the circuit breaker is not affected by other equipment, which can facilitate the maintenance of the circuit breaker, and the arrangement direction of the first circuit breaker of each GIS Consistent with the direction of the main busbar, this avoids the problem that the overall width of the GIS is too large due to the arrangement of circuit breakers corresponding to each phase.

At the same time, the first branch busbar and the second branch busbar are connected through a breaking device with a third circuit breaker, so that when one of the main busbars or the circuit breaker is to be overhauled, the first and second outgoing lines are routed through the other main busbar. To ensure the normal use of the two power supply circuits and avoid the problem of partial power supply circuit power failure.

Description of drawings

1 is a schematic structural diagram of Embodiment 1 of a gas-insulated metal-enclosed switchgear in the present invention;

Fig. 2 is the layout schematic diagram of the first main busbar, the second main busbar and each isolation grounding device of the GIS single-phase in Fig. 1;

Fig. 3 is the electrical schematic diagram of GIS single-phase in embodiment 1 of gas-insulated metal-enclosed switchgear;

4 is a schematic structural diagram of Embodiment 2 of the gas-insulated metal-enclosed switchgear in the present invention;

5 is a schematic diagram of the layout of the first main busbar, the second main busbar and each isolation grounding device of the GIS single-phase in FIG. 4;

6 is a schematic structural diagram of Embodiment 3 of the gas-insulated metal-enclosed switchgear in the present invention;

FIG. 7 is a schematic diagram of the arrangement of the first main busbar, the second main busbar and each isolation grounding device of the GIS single-phase in FIG. 6 .

Detailed ways

Example 1 of gas-insulated metal-enclosed switchgear:

As shown in Figures 1 to 3: the gas-insulated metal-enclosed switchgear in this embodiment is 330kV GIS, and GIS is the abbreviation of gas-insulated metal-enclosed switchgear. The GIS includes three GIS single-phase, and the main bus of each GIS single-phase is Both include a first main bus bar 1 and a second main bus bar 8 arranged side by side at an upper and lower interval, and both the first main bus bar 1 and the second main bus bar 8 extend in the left-right direction.

Between the first main bus bar 1 and the second main bus bar 8 are arranged a first branch bus bar whose upper end is electrically connected to the first main bus bar and a second branch bus bar whose lower end is electrically connected to the second main bus bar. The branch busbars are connected in series by a breaking device with a third circuit breaker 18. The first branch busbar and the second branch busbar are respectively provided with a first outlet end 6 and a second outlet end 11 for connecting with the corresponding power supply circuit, A first circuit breaker 17 is arranged between the first main bus 1 and the first outlet end 6 on the first branch bus, and a second circuit breaker 17 is arranged between the second main bus 8 and the second outlet end 11 on the second branch bus. The circuit breakers 19 , the first circuit breaker 17 , the second circuit breaker 19 and the third circuit breaker 18 are all vertical circuit breakers arranged in parallel, and the so-called vertical circuit breakers refer to vertically placed circuit breakers.

The first circuit breakers 17 of each GIS single-phase are arranged in a line in the left-right direction, the second circuit breakers 19 of each GIS single-phase are arranged in a line in the left-right direction, and the third circuit breakers 18 of each GIS single-phase are arranged in a line in the left-right direction. The characters are arranged side by side, and the first circuit breaker, the second circuit breaker and the third circuit breaker of each GIS single-phase are located on the front side of each main bus.

The third circuit breaker 18 of each GIS single-phase is located directly to the right of the first circuit breaker 17 of each GIS single-phase, and the second circuit breaker 19 of each GIS single-phase is located directly to the right of the third circuit breaker 18 of each GIS single-phase. side, that is, the axes of the circuit breakers are in the same vertical plane.

And in the up-down direction, the first circuit breaker, the second circuit breaker and the third circuit breaker are located between the first main busbar 1 and the second main busbar 8, that is, the first circuit breaker, the second circuit breaker and the third circuit breaker. The highest position of the circuit breaker is lower than the first main busbar, and the lowest positions of the first circuit breaker, the second circuit breaker and the third circuit breaker are higher than the second main busbar.

The upper end of the first circuit breaker is provided with a first isolation and grounding device 3, the lower end of the first circuit breaker is provided with a second isolation and grounding device 5; the lower end of the third circuit breaker is provided with a third isolation and grounding device 9, The upper end is provided with a fourth isolation and grounding device 10 ; the upper end of the second circuit breaker is provided with a fifth isolation and grounding device 15 , and the lower end of the second circuit breaker is provided with a sixth isolation and grounding device 14 .

The first branch busbar includes a first branch busbar first connecting part 4 connected between the first main busbar 1 and the first isolation grounding device 3 and a first connecting part 4 connected between the second isolation grounding device 5 and the third isolation grounding device 9 . The second connecting portion 7 of the first branch bus bar extending in the left-right direction.

The second branch busbar includes a first connection portion 16 of the second branch busbar connected between the second main busbar 8 and the sixth isolation grounding device 14 and a first connection portion 16 connected between the fourth isolation grounding device 10 and the fifth isolation grounding device 15 The second connecting portion 13 of the second branch bus bar extending in the left-right direction, in this embodiment, each isolating grounding device includes an isolating switch and a grounding switch. In Figures 1 and 2, item 12 represents a power supply loop connected to the first outlet.

A part of the busbar conductors of the branch busbar is located in the corresponding isolating switch, so the position of the outlet end can be flexibly arranged, the use of the branch busbar is reduced, and the cost is saved. For example, in this embodiment, the first outlet end 6 is arranged on the second connection of the first branch busbar On the part 7, the second outlet end 11 is arranged on the second connecting part 13 of the second branch bus bar. A first branch gas-insulating insulator is provided at the branch position where the first main busbar is connected to the first branch busbar and at the connection position between the isolation switch of the first isolating grounding device and the first branch busbar. A first transition air chamber 2 is formed between, and a second branch gas insulating insulator is provided at the branch position where the second main busbar is connected with the second branch busbar and at the connection position between the isolating switch of the sixth isolation grounding device and the second branch busbar , A second transition air chamber is formed between the two second branch gas barrier insulators. The gas barrier insulator is a common insulator, which includes an insulating body and a center conductor sealed on the insulating body. The center conductor runs through the insulating body. The insulating body can be sealingly matched with the corresponding cylinder. Current transformers 20 are also provided on both sides of each circuit breaker.

The present invention adopts the 3/2 wiring form, when one bus fails, the two power supply circuits do not need to be powered off. For example, when the first main bus fails, the first circuit breaker is tripped, and the second main bus The first outlet and the second outlet are powered, the two power supply circuits do not need to be powered off, and the substation can still operate normally. The two main busbars are arranged up and down, the entire GIS is neatly arranged and beautiful, and the space usage in the front and rear directions is saved. By setting the transition air chamber, the air chambers of the first and second main busbars will not be affected during the maintenance of the disconnector or the long-term equipment expansion, thereby reducing the workload on site and saving on-site operation time; the use of vertical circuit breakers is convenient for each The arrangement of the phase circuit breakers is also more in line with the busbar arrangement of the upper and lower arrangement.

Example 2 of gas-insulated metal-enclosed switchgear:

As shown in Figure 4 and Figure 5: the electrical principle of Embodiment 2 is the same as that of Embodiment 1. The difference between Embodiment 2 and Embodiment 1 is that the lead wires can be easily connected from the corresponding isolation switch, so the setting form of the outlet end is more flexible. Alternatively, the first outlet terminal 6 is directly connected to the right end of the isolation switch of the third isolation and grounding device 9 , and the second outlet terminal 11 is directly connected to the left end of the isolation switch of the fourth isolation and grounding device 10 . Item 17 in the figure represents the first circuit breaker; item 18 represents the third circuit breaker; item 19 represents the second circuit breaker; item 1 represents the first main bus; item 12 represents the power supply circuit;

Example 3 of gas-insulated metal-enclosed switchgear:

As shown in FIGS. 6 and 7 : the electrical principle of Embodiment 3 is the same as that of Embodiment 1, and the difference between Embodiment 3 and Embodiment 1 is that the first outlet terminal 6 is connected to the left end of the isolation switch of the second isolation grounding device 5 , the second outlet terminal 11 is connected to the right end of the isolation switch of the fifth isolation grounding device 10 . Item 17 in the figure represents the first circuit breaker; item 18 represents the third circuit breaker; item 19 represents the second circuit breaker; item 1 represents the first main bus; item 12 represents the power supply circuit;

In the above three embodiments, the first circuit breaker of each GIS single-phase is located on the front side of each main busbar, and the second circuit breaker of each GIS single-phase is located on the front side of each main busbar. The one-way first and second circuit breakers may also be located on the rear side of each main bus. Of course, correspondingly, the third circuit breaker of each GIS can also be located on the same side in the front-rear direction of the corresponding main busbar as the first circuit breaker and the second circuit breaker.

Claims (10)

1. A gas-insulated metal-enclosed switchgear, comprising three GIS single-phases, and the main busbars of each GIS single-phase include a first main busbar and a second main busbar extending in the left-right direction, and the first main busbar is electrically connected. There is a first branch busbar, a second branch busbar is electrically connected to the second main busbar, a first outlet wire end is arranged on the first branch busbar, a second outlet wire end is arranged on the second branch busbar, and the first branch busbar is connected to the first branch busbar. A first circuit breaker is arranged between a main busbar and the first outlet end, and a second circuit breaker is arranged between the second main busbar and the second outlet end on the second branch busbar. The first circuit breakers are arranged side by side along the left and right directions, the first circuit breakers of each GIS single-phase are located on the front side or the rear side of each main bus; the second circuit breakers of each GIS single phase are arranged side by side along the left and right directions, and each The second circuit breaker of the GIS single-phase is located on the front side or the rear side of each main bus. 2. The gas-insulated metal-enclosed switchgear according to claim 1, wherein the first circuit breaker of each GIS single-phase and the second circuit breaker of each GIS single-phase are located on the same side of each main bus, and each GIS single-phase circuit breaker is located on the same side of each main bus. The second circuit breaker of the phase is located on the right side of the first circuit breaker of each GIS single-phase, and the first circuit breaker and the second circuit breaker are vertical circuit breakers arranged in parallel. 3. The gas-insulated metal-enclosed switchgear according to claim 2, wherein each GIS single-phase further comprises a third circuit breaker connected in series between the first branch busbar and the second branch busbar, the third circuit breaker It is located between the first outlet end and the second outlet end of the corresponding GIS single-phase. The right side of the first circuit breaker, the right side of the second circuit breaker of each GIS single-phase, and the third circuit breaker are vertical circuit breakers arranged in parallel. 4. The gas-insulated metal-enclosed switchgear according to claim 1, wherein a first branch gas-insulating insulator is provided at the connection between the first main busbar and the first branch busbar, and the second main busbar and the second branch busbar A second branch gas barrier insulator is arranged at the connection. 5. The gas-insulated metal-enclosed switchgear according to claim 3, wherein the upper end of the first circuit breaker is provided with a first isolation grounding device, and the lower end of the first circuit breaker is provided with a second isolation and grounding device; The lower end of the circuit breaker is provided with a third isolation and grounding device, the upper end of the third circuit breaker is provided with a fourth isolation and grounding device; the upper end of the second circuit breaker is provided with a fifth isolation and grounding device, and the lower end of the second circuit breaker is provided with a sixth isolation and grounding device. The isolation grounding device, the first branch busbar comprises a first connection part of the first branch busbar connected between the first main busbar and the first isolation grounding device, and a ridge connected between the second isolation grounding device and the third isolation grounding device The second connection part of the first branch busbar extending in the left-right direction, the second branch busbar comprises a first connection part of the second branch busbar connected between the second main busbar and the sixth isolation grounding device, and a first connection part of the second branch busbar connected between the fourth isolation grounding device and the sixth isolation grounding device. The second connection portion of the second branch busbar extending in the left-right direction between the fifth isolation grounding devices. 6 . The gas-insulated metal-enclosed switchgear according to claim 5 , wherein the first outlet end is arranged on the second connection part of the first branch bus bar, and the second outlet end is arranged on the second branch bus bar. 7 . on the second connecting part. 7 . The gas-insulated metal-enclosed switchgear according to claim 5 , wherein the first outlet end is connected to the right end of the third isolation grounding device; the second outlet end is connected to the fourth isolation grounding device. 8 . left end. 8 . The gas-insulated metal-enclosed switchgear according to claim 5 , wherein the first outlet end is connected to the left end of the second isolation grounding device; the second outlet end is connected to the right end of the fifth isolation grounding device. 9 . 9. The gas-insulated metal-enclosed switchgear according to any one of claims 1 to 8, wherein the first main busbar and the second main busbar of each GIS single-phase are arranged side by side at an upper and lower interval, and each GIS single-phase The main busbars are arranged side by side at intervals along the front and rear directions. 10. The gas-insulated metal-enclosed switchgear according to claim 9, characterized in that: in the height direction, the first branch busbar, the second branch busbar, the first circuit breaker, and the second circuit breaker of each GIS single-phase are in the height direction. between the first main busbar and the second main busbar.

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