CN106129887B - GIS prepared separations, outside line enlargement method and GIS device - Google Patents

Abstract

The invention relates to a GIS reserved interval, an external line expansion method and GIS equipment. The GIS equipment is internally provided with a GIS reserved interval, and the reserved interval includes a first bus bar, a second bus bar, a first isolating switch and a second isolating switch, The isolating switch for expansion and the expansion interface, the first bus bar is connected to one end of the first isolating switch, the second bus bar is connected to one end of the second isolating switch, the other end of the first isolating switch and the second isolating switch are connected through a connecting conductor, and the isolating switch for expansion One end of the switch is connected to the connecting conductor, and the other end is connected to the expansion interface; the above seven parts are respectively arranged in seven independent air chambers. During construction, reduce the air pressure in the air chamber where the isolating switch for expansion is located to a set value, control the air pressure in the air chamber where the expansion interface is located to atmospheric pressure, and then carry out the subsequent operation of expanding the external line. This method can avoid large-scale power outages and ensure the overall safety, reliability and convenience of the expansion work.

Description

GIS Reserved Interval, External Line Expansion Method and GIS Equipment

technical field

The invention relates to the field of GIS application technology or the field of power transmission technology, and in particular to a GIS reserved interval, a method for expanding external lines and GIS equipment.

Background technique

In some large-scale GIS projects, for individual circuit breaker intervals that have not yet been put into operation, in order to reduce the safety risk caused by the long-term non-operation of the equipment and reduce the initial project budget, in the substation design, generally in the first phase During the construction period, only the main bus isolation grounding switch in this interval will be in place, and the equipment components in this interval, such as circuit breakers, line isolation earthing switches and current transformers, will be reserved as future projects. This interval is generally called " Circuit breakers reserve expansion intervals".

As shown in Figure 1, it is a schematic diagram of the primary main wiring we are currently using. The structure of the reserved interval is shown in the figure. Among them, 1M is 1M main bus, 2M is 2M main bus, and DS/ES1 is 1M main bus Three-position isolating/grounding switch, DS2 is a 2M main busbar isolating switch. As shown in Figure 2, it is a structural schematic diagram of the reserved interval, including 1M main busbar ①, 2M main busbar ②, main busbar isolating switch③, and main busbar isolating grounding switch④. When the existing reserved interval needs to be put into operation, the expansion docking work shall be carried out on the reserved interval site. For the conventional reserved space design structure, since the live main busbar and the expansion interface are only electrically isolated by the main busbar isolating switch, in this case, in order to ensure the safety of the operating equipment, the docking work needs to be completed on the main busbar. In the state of power outage (equivalent to the power outage of the whole station), it will affect the power supply plan of the entire substation project and related power systems, cause a large-scale power outage, reduce the overall safety, reliability and convenience of the expansion work, and cannot Meet the requirements of the actual project for the uninterrupted docking function of reserved expansion intervals.

Moreover, the existing reservation interval also has the following problems:

1. The safety of on-site expansion workers. During on-site expansion construction, docking operators will inevitably move around the docking interface. However, since the expansion construction is carried out under the condition of normal operation of the main equipment, there is a huge air pressure difference on both sides of the gas-tight insulator at the docking interface. How to ensure It is an urgent problem to be solved urgently for operators to work safely under this working condition.

2. The impact of on-site pressure test at reserved intervals on the first-phase equipment. After the docking work of the expansion is completed, it is necessary to conduct on-site pressure tests on the expanded equipment. How to implement a complete pressure test on the expanded equipment without affecting the operation of the first phase of the project is an urgent problem that needs to be solved.

3. Reserve intervals to deal with emergencies during expansion.

Contents of the invention

The purpose of the present invention is to provide a GIS reserved interval, which is used to solve the problem that the current GIS reserved interval cannot meet the functional requirements of the reserved expansion interval for non-power-off docking in actual projects. The invention simultaneously provides a GIS reserved interval external line expansion method and a GIS device.

In order to achieve the above object, the solution of the present invention includes a GIS reserved interval, including a first bus bar, a second bus bar, a first isolating switch and a second isolating switch, and the first bus bar is connected to one end of the first isolating switch , the second bus bar is connected to one end of the second isolating switch, the other end of the first isolating switch is connected to the other end of the second isolating switch through a connecting conductor, and the GIS reserved interval also includes An isolating switch and an expansion interface for connecting with an external expansion circuit, one end of the isolating switch for expansion is connected to the connecting conductor, and the other end is connected to the expansion interface; the first bus bar is arranged in the first air chamber, and the The second bus bar is arranged in the second air chamber, the first isolating switch is arranged in the third air chamber, the second isolating switch is arranged in the fourth air chamber, and the connecting conductor is arranged in the fifth air chamber In the above, the isolating switch for expansion is arranged in the sixth air chamber, and the expansion interface is arranged in the seventh air chamber.

The sixth air chamber and the seventh air chamber are connected through a gas-tight pot insulator.

The moving contact of the isolating switch for expansion is connected to the connecting conductor, and the static contact is connected to the expansion interface.

The seventh air chamber includes a housing, and a cover detachably assembled with the housing.

A GIS device, comprising a GIS reserved interval, the GIS reserved interval includes a first bus bar, a second bus bar, a first isolating switch and a second isolating switch, and the first bus bar is connected to one end of the first isolating switch , the second bus bar is connected to one end of the second isolating switch, the other end of the first isolating switch is connected to the other end of the second isolating switch through a connecting conductor, and the GIS reserved interval also includes An isolating switch and an expansion interface for connecting with an external expansion circuit, one end of the isolating switch for expansion is connected to the connecting conductor, and the other end is connected to the expansion interface; the first bus bar is arranged in the first air chamber, and the The second bus bar is arranged in the second air chamber, the first isolating switch is arranged in the third air chamber, the second isolating switch is arranged in the fourth air chamber, and the connecting conductor is arranged in the fifth air chamber In the above, the isolating switch for expansion is arranged in the sixth air chamber, and the expansion interface is arranged in the seventh air chamber.

The sixth air chamber and the seventh air chamber are connected through a gas-tight pot insulator.

The moving contact of the isolating switch for expansion is connected to the connecting conductor, and the static contact is connected to the expansion interface.

The seventh air chamber includes a housing, and a cover detachably assembled with the housing.

A method for expanding external lines with GIS reserved intervals. During construction, reduce the air pressure in the air chamber where the isolation switch for expansion is located to a set value, control the air pressure in the air chamber where the expansion interface is located to atmospheric pressure, and then carry out subsequent external expansion. operation of the line.

In the reserved interval provided by the present invention, not only the main bus isolating switch (the first isolating switch and the second isolating switch) is electrically isolated between the live main bus and the expansion interface, but also an expansion isolating switch is used for electrical isolation , in this case, when the power line is being expanded, the isolating switch for expansion is in the off state, and due to the electrical isolation of the isolating switch for expansion, the docking work can be carried out under the normal operation of the main bus, without the need to control the main bus for complete power failure , which will not affect the power supply plan of the entire substation project and related power systems, avoiding large-scale power outages, ensuring the overall safety, reliability and convenience of the expansion work, and satisfying the need for uninterrupted power supply during reserved expansion intervals in actual projects Docking function requirements. Moreover, the air chamber corresponding to the connecting conductor is a transitional air chamber, which can play a transitional buffer role in the first phase of the project and the reserved expansion project, and has a good ability to deal with unexpected accidents that may occur during the docking work of the reserved interval expansion.

Moreover, when carrying out external expansion, by reducing the gas pressure in the sixth air chamber to a certain value, the seventh air chamber is put at atmospheric pressure, so as to reduce the insulator between the sixth air chamber and the seventh air chamber. The pressure difference between the two sides ensures that the operators can work safely under this working condition.

In addition, by setting the isolating switch for expansion, the test voltage is applied from one side of the expansion line, and the test range stops when the static contact of the isolating switch for expansion stops. All the expansion equipment is within the scope of the field withstand voltage test. Fully inspect the insulation performance to ensure the reliability of interval power transmission, and implement a complete withstand voltage test on the expansion equipment without affecting the operation of the first phase of the project.

Description of drawings

Figure 1 is a schematic diagram of the existing primary main wiring;

FIG. 2 is a schematic structural diagram of an existing reserved interval;

Fig. 3 is a schematic circuit diagram of a reserved interval provided by the present invention;

Fig. 4 is a schematic structural diagram of a reserved interval provided by the present invention;

Fig. 5 is the schematic circuit diagram of the GIS equipment based on the reserved interval provided by the present invention;

Fig. 6 is a schematic circuit diagram of an embodiment of a complete interval after expansion;

Fig. 7 is a structural schematic diagram of an embodiment of a complete compartment after expansion.

Detailed ways

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

The GIS reserved interval provided by the invention can realize the safe expansion work of the main bus without power failure. As shown in Figure 3, the GIS reserved interval includes 1M main busbar ①, 2M main busbar ②, main busbar isolation switch DS2③, main busbar isolation and earthing switch DS/ES1④, connecting conductor ⑤, expansion isolation switch DS3⑥, expansion interface ⑦ (This embodiment takes expanding the docking interface as an example).

In the GIS reserved interval circuit, the 1M main busbar ① is connected to the above-mentioned connecting conductor ⑤ through the main busbar isolating switch DS/ES1④, and the 2M main busbar ② is also connected to the above-mentioned connecting conductor ⑤ through the main busbar isolating switch DS2③, that is, the main busbar isolating switch DS2③ One end of the isolating and earthing switch DS/ES1④ is connected to the above connecting conductor ⑤, and the connecting conductor ⑤ is connected to the expansion docking interface ⑦ through the isolating switch DS3⑥ for expansion.

Seven components in the GIS reserved interval: 1M main busbar ①, 2M main busbar ②, main busbar isolating switch DS2③, main busbar isolating and earthing switch DS/ES1④, connecting conductor ⑤, expansion isolating switch DS3⑥, expansion docking interface ⑦ They are arranged in seven independent air chambers respectively, and these seven air chambers are named as the first air chamber to the seventh air chamber in turn. Then, the 1M main busbar ① is arranged in the first air chamber, and the 2M main busbar ② is arranged in the second air chamber. In the second air chamber, the main busbar isolating switch DS2③ is set in the fourth air chamber, the main busbar isolation and grounding switch DS/ES1④ is set in the third air chamber, the connecting conductor ⑤ is set in the fifth air chamber, and the expansion disconnector DS3⑥ It is arranged in the sixth air chamber, and the expansion docking interface ⑦ is arranged in the seventh air chamber. In this embodiment, among the seven independent air chambers, any two adjacent air chambers are provided with gas-tight type insulators, and taking the gas-tight type pot insulators as an example, for example: the sixth air chamber and the seventh Gas-tight pot insulators are installed between the air chambers . In addition, under normal conditions, the seven chambers are all filled with SF6 gas.

Moreover, in this embodiment, the connecting conductor ⑤ is connected to the moving contact of the expansion disconnector DS3 ⑥, and the static contact of the expansion disconnector DS3 ⑥ is connected to the expansion docking interface ⑦. Of course, as other embodiments, the connecting conductor ⑤ can also be connected to the static contact of the expansion disconnector DS3 ⑥, and the moving contact of the expansion disconnector DS3 ⑥ is connected to the expansion docking interface ⑦.

Figure 4 shows the structure of the reserved interval. The above seven components are installed in place with the first phase of the project. Among them, 1M main busbar ① and 2M main busbar ② are used to connect other compartments of GIS equipment to form a GIS equipment. The main busbar isolating switch DS2③ and the main busbar isolating and grounding switch DS/ES1④ are used to electrically isolate the main busbar from the extension docking interface ⑦. The fifth air chamber corresponding to the connecting conductor ⑤ is a transitional air chamber, which acts as a transitional buffer in the first phase of the project and the reserved expansion project, and when an accident occurs in the expansion docking and on-site pressure work, this air chamber can buffer the failure The scope of influence is to ensure the normal operation of live equipment. The air chamber corresponding to the isolation switch DS3⑥ for expansion can not only play the role of electrical isolation, but also play the role of transitional buffer during the expansion docking work. The expansion docking of the reserved interval is carried out at the expansion docking interface ⑦.

The GIS reserve interval adopts a brand-new product structure, the 1M main busbar ① and 2M main busbar ② and the expansion docking interface ⑦ can be completely independent in terms of electrical performance and air chamber division, connecting conductor ⑤, expansion isolation switch DS3 ⑥ and expansion The setting of the air chamber at the docking interface ⑦ has a good ability to deal with unexpected accidents that may occur during the expansion of the docking work with reserved intervals.

Fig. 5 is a schematic circuit diagram of a GIS device based on the reserved interval.

In actual engineering operation, 1M main busbar ① and 2M main busbar ② are continuously powered on, and in the third and fourth air chambers, the main busbar isolating switch DS2③ and the main busbar isolating and grounding switch DS/ES1④ are in the off state. For any one of the two isolating switches, the upper isolating switch static contact is electrically connected to the main busbar and is in a live state, and the lower moving contact is at zero potential. Moreover, the third air chamber and the fourth air chamber are filled with SF6 gas of rated design pressure to realize electrical insulation between dynamic and static fractures, thereby realizing electrical isolation from the main busbar.

When the on-site expansion docking work starts, firstly ensure that the main bus isolation switch DS2③ and the main bus isolation grounding switch DS/ES1④ are in the disconnected state to isolate the electrical connection between the main bus and the expansion interface, and then the sixth air chamber The gas pressure is reduced by half, and the seventh air chamber is put at atmospheric pressure, thereby lowering the insulator Differential pressure on both sides, insulator It is an insulator between the sixth air chamber and the seventh air chamber.

When performing docking, the cover and shell of the seventh air chamber need to be removed first, and the docking work is performed on the insulator. Since the pressure in the sixth air chamber has been reduced to half pressure, it can largely avoid the connection between the butt conductor and the insulator. When the electrical connection is matched, due to the insulator The possibility of insulator rupture and gas leakage caused by uneven stress also provides a favorable guarantee for the personal safety of operators.

In this embodiment, a complete interval after expansion is given, as shown in Figure 6 and Figure 7, wherein the expanded line includes a circuit breaker GCB⑧, a current transformer CT, and a three-position isolating grounding switch on the line side in sequence DS/ES4⑨ and fast earthing switch H-ES, circuit breaker GCB⑧ and current transformer CT are set in the eighth air chamber, three-position isolating earthing switch DS/ES4⑨ on the line side and fast earthing switch H-ES are set in the ninth air chamber In the chamber, a gas-tight insulator is also arranged between the two air chambers.

After the expansion is completed, on-site pressure test is required for the expansion equipment. Before the test, the gas pressure in the sixth air chamber should be restored to the rated design pressure. The isolation switch ⑥ for expansion should be in the disconnected state, and the test voltage should be isolated and grounded by the three stations on the line side. The switch DS/ES4⑨ side is applied (the lightning-like arrow in Figure 7 indicates the position where the test voltage is applied), and the test range stops at the isolation fracture of the isolating switch ⑥ for expansion. All the expansion equipment is within the scope of the on-site withstand voltage test. The assembly quality and insulation performance of the expansion work shall be fully inspected to ensure the reliability of interval power transmission.

Since the expansion docking work is carried out on site, the operating environment and construction equipment are relatively simple, and there is the possibility of accidents during the expansion docking and on-site voltage withstand work (such as damage to product parts caused by improper docking operations and discharge during the on-site voltage withstand test) Accidents, etc.), when an accident occurs, it is first necessary to ensure the safe operation of the equipment put into operation in the first phase. In this case, the setting of the sixth air chamber and the seventh air chamber can well ensure the normal operation of the live equipment.

In the case of component damage due to docking operations, it occurs in the insulator It is more likely to expand the docking part, if the insulator If damaged, the isolation fracture of the isolation switch ⑥ for expansion will fail accordingly. At this time, the expansion docking work should be stopped. In order to ensure the normal operation of live equipment, the insulator can be removed. Assemble (the static contacts of the isolating switch ⑥ for expansion are removed together), and use the seventh air chamber cover to seal the expansion docking interface ⑦, and wait for the parts to be repaired before re-implementing the expansion work.

For discharge accidents caused by on-site withstand voltage tests, the probability of them occurring in the sixth and eighth gas chambers is relatively high (there is a large potential difference at the isolation fracture of the isolating switch ⑥ for expansion during the withstand voltage test, and the eighth The air chamber is a docking air chamber, and there may be docking foreign objects remaining in the air chamber). If the accident occurs in the sixth gas chamber, the arc decomposition products generated by the discharge will cover the entire inner wall of the gas chamber, including the gas-stop insulators on both sides of the gas chamber. The cover blocks the port of the fifth air chamber.

If the accident occurs in the ninth air chamber, it can be dealt with according to the plan for parts damaged during the docking operation, and the expansion operation can be carried out again after the parts are repaired.

In addition, in Figures 2, 4 and 7, the 1M main busbar ① and the main busbar isolating switch DS2③ are on the side of the isolating switch DS3⑤ for expansion, and the 2M main busbar ② and the main busbar isolation and grounding switch DS/ES1④ are on the side of the isolating switch DS3⑤ for expansion On the other side, this only indicates a positional relationship, and does not mean that the 1M main bus ① is connected to the main bus disconnector DS2③, and the 2M main bus ② is connected to the main bus disconnector DS/ES1④.

In the above embodiment, the isolating switch for expansion and the expansion interface are arranged in different air chambers. By adjusting the air pressure in the two air chambers respectively, the huge air pressure difference on both sides of the insulator between the two air chambers can be reduced. This method can ensure the safe operation of the operators during construction. Of course, this is only an optimized implementation. As other embodiments, the expansion disconnector and the expansion interface can also be set in the same air chamber. At this time Just do not have above-mentioned technical effect.

In the above-mentioned embodiment, when the GIS reserves an interval for expansion construction, first reduce the air pressure of the air chamber where the isolating switch is located for expansion (i.e. the sixth air chamber) to a set value, and control the air chamber where the expansion interface is located (i.e. the seventh air chamber) The air pressure in ) is atmospheric pressure, and then carry out the subsequent operation of expanding the external line. The construction method is based on seven independent air chambers in the GIS reserved interval, among which, the connecting conductor ⑤, the expansion disconnector DS3⑥ and the expansion docking interface ⑦ are respectively set in the independent air chambers. Since the above method is based on the expansion isolation switch The air chamber where DS3 ⑥ is located and the air chamber where the expansion docking interface ⑦ is located are described. Therefore, whether the connecting conductor ⑤ is separately arranged in an independent air chamber will not affect the above construction method. Therefore, as other embodiments, the connection The conductor ⑤ can also be set in the same air chamber as the expansion disconnector DS3 ⑥.

The specific implementation is given above, which includes a specific complete interval circuit structure and the processing means required when several kinds of faults occur, but the present invention is not limited to the described implementation. The basic ideas and inventive points of the present invention lie in the structure of the above-mentioned reserved intervals, and the changes, modifications, replacements and modifications to the implementations without departing from the principle and spirit of the present invention still fall within the protection scope of the present invention.

Claims (9)

1. a kind of GIS prepared separations, including the first bus, the second bus, the first disconnecting switch and the second disconnecting switch, described One bus connects one end of first disconnecting switch, and second bus connects one end of second disconnecting switch, described The other end of first disconnecting switch and the other end of second disconnecting switch are connected by connecting conductor, it is characterised in that institute Stating GIS prepared separations also includes enlarging disconnecting switch and for the enlarging interface with outside enlarging connection, the enlarging The connection conductor is connected with one end of disconnecting switch, the other end connects the enlarging interface；First bus is arranged on In one air chamber, second bus is arranged in the second air chamber, and first disconnecting switch is arranged in the 3rd air chamber, and described Two disconnecting switch are arranged in the 4th air chamber, and the connection conductor is arranged in the 5th air chamber, and the enlarging is set with disconnecting switch Put in the 6th air chamber, the enlarging interface is arranged in the 7th air chamber；When carrying out power circuit enlarging, main bus-bar is kept apart Close and be similarly off-state with disconnecting switch for off-state, enlarging, and because main bus-bar disconnecting switch and enlarging are isolated The dual electrical isolation effect of switch, mating operation can be carried out under main bus-bar normal operation, without controlling main bus-bar complete Have a power failure；Accident generation will cover whole air chamber inwall in the 6th air chamber, then electric arc analyte caused by electric discharge, now the 6th air chamber Overall pulling down, and the 5th air chamber port is blocked using the capping of the 7th air chamber.

2. GIS prepared separations according to claim 1, it is characterised in that lead between the 6th air chamber and the 7th air chamber Cross the connection of gas-stopping type disc insulator.

3. GIS prepared separations according to claim 1, it is characterised in that the moving contact of the enlarging disconnecting switch connects The connection conductor is connect, static contact connects the enlarging interface.

4. GIS prepared separations according to claim 1, it is characterised in that the 7th air chamber includes housing, and and shell The capping that body detachably assembles.

5. a kind of GIS device, including GIS prepared separations, the GIS prepared separations include the first bus, the second bus, first every Pass and the second disconnecting switch are left, first bus connects one end of first disconnecting switch, the second bus connection The other end of one end of second disconnecting switch, the other end of first disconnecting switch and second disconnecting switch passes through Connect conductor connection, it is characterised in that the GIS prepared separations also include enlarging disconnecting switch and for extending line with outside The enlarging interface of road connection, one end of the enlarging disconnecting switch connect the connection conductor, and the other end connects the enlarging Interface；First bus is arranged in the first air chamber, and second bus is arranged in the second air chamber, and described first keeps apart Pass is arranged in the 3rd air chamber, and second disconnecting switch is arranged in the 4th air chamber, and the connection conductor is arranged on the 5th gas In room, the enlarging is arranged in the 6th air chamber with disconnecting switch, and the enlarging interface is arranged in the 7th air chamber；Carrying out electricity When line of force road is extended, main bus-bar disconnecting switch is off-state, and enlarging is similarly off-state with disconnecting switch, and due to master The dual electrical isolation of bus isolating switch and enlarging disconnecting switch acts on, and mating operation can be under main bus-bar normal operation Carry out, without controlling main bus-bar to have a power failure completely；Accident generation will cover whole in the 6th air chamber, then electric arc analyte caused by electric discharge Individual air chamber inwall, now the 6th air chamber overall pulling down, and being blocked using the capping of the 7th air chamber to the 5th air chamber port.

6. GIS device according to claim 5, it is characterised in that by only between the 6th air chamber and the 7th air chamber Gas formula disc insulator connects.

7. GIS device according to claim 5, it is characterised in that the moving contact connection institute of the enlarging disconnecting switch Connection conductor is stated, static contact connects the enlarging interface.

8. GIS device according to claim 5, it is characterised in that the 7th air chamber includes housing, and can with housing Dismantle the capping of assembling.

9. a kind of outside line enlargement method using GIS prepared separations as claimed in claim 1, it is characterised in that applying The air pressure in the air chamber of interface place is extended in man-hour, the air pressure of air chamber where reducing enlarging disconnecting switch a to setting value, control For atmospheric pressure, the operation of follow-up enlarging outside line is then carried out.