CN116260066B - A high-voltage GIS double busbar connection device and substation for uninterrupted power supply expansion - Google Patents

Abstract

This invention discloses a high-voltage GIS double busbar connection device and substation for uninterrupted power supply expansion. The device includes a first working busbar, a first disconnecting switch, a standby working busbar, a second disconnecting switch, a grounding switch, a gas gap insulation unit, a circuit breaker, a current transformer, a three-position switch, a fast grounding switch, and an expansion port. The first disconnecting switch is connected to the output terminal of the first working busbar to form a first series output branch. The second disconnecting switch is connected to the output terminal of the standby working busbar to form a second series output branch. The second series output branch is connected in parallel with the first series output branch to form a first parallel output branch. One end of the grounding switch is connected to the first parallel output, and the other end is grounded. The first parallel output is connected in series with the gas gap insulation unit, circuit breaker, current transformer, three-position switch, and fast grounding switch to form a third series output branch. This device allows for expansion without power outages while ensuring safety.

Description

Uninterrupted power supply is expanded with two bus connection devices of high voltage GIS and transformer substation

Technical Field

The invention relates to the technical field of substations, in particular to a high-voltage GIS double-bus wiring device for uninterrupted extension and a substation.

Background

High voltage GIS (GasInsulatedSwitchgear) has been widely used in power systems, but more and more high voltage GIS projects need to be built in stages.

In the prior art, when a high-voltage GIS is expanded or a standby interval handover withstand voltage test is carried out, power failure treatment is carried out on an original operation bus to prevent reverse superposition of overvoltage at two ends of an isolation fracture during the handover test, as the overvoltage possibly causes fracture discharge breakdown, and further power grid accidents are caused, for an operation unit, power failure of the substation bus is coordinated, and delay of engineering progress, waste of manpower and material resources and direct or indirect economic loss caused by power failure are meant.

Disclosure of Invention

The invention aims to solve the technical problems of the prior art, and provides a high-voltage GIS double-bus wiring device for uninterrupted power extension and a transformer substation, so as to solve the problem that power is still required to be cut off during uninterrupted power extension on the premise of ensuring safety.

In a first aspect, the present invention provides a high voltage GIS double bus wiring device for uninterrupted extension, including:

the first isolating switch is connected with the output end of the first working bus to form a first series output branch;

The second isolating switch is connected with the output end of the standby working bus to form a second serial output branch, and the second serial output branch is connected with the first serial output branch in parallel to form a first parallel output branch;

One end of the grounding switch is connected with the first parallel output branch, and the other end of the grounding switch is grounded;

The extension protection assembly comprises a gas gap insulation unit, a circuit breaker, a current transformer, a three-station switch and a quick grounding switch, wherein the quick grounding switch is used for opening or closing a quick grounding switch of an output line, the three-station switch is used for isolating the line on the outlet side from the line and grounding the line, the current transformer is used for measuring the current on the outlet side and protecting the current, the circuit breaker is used for opening and closing the output line, and the gas gap insulation unit is used for insulating the first parallel output and the circuit breaker;

The first parallel output branch is sequentially connected with the gas gap insulation unit, the circuit breaker, the current transformer, the three-station switch and the fast grounding switch in series to form a third serial output branch;

and the extension port is connected with the output end of the third serial output branch.

Further, the gas gap insulation unit is an insulation shell and a long gas insulation gap formed by insulation gas in the insulation shell, one end of the insulation shell is connected with the first parallel output branch and used for insulating the first parallel output branch, and the other end of the insulation shell is connected with the circuit breaker and used for insulating the circuit breaker.

Further, the insulating shell is made of mica, asbestos or glass, and the insulating gas in the insulating shell is clean air, nitrogen or sulfur hexafluoride.

Further, the breaker is one of an oil breaker, a sulfur hexafluoride breaker, a vacuum breaker and a compressed air breaker.

Further, the three-position switch is a three-position load switch.

In a second aspect, the invention provides a transformer substation, which comprises high-voltage GIS power distribution equipment, high-voltage GIS equipment to be expanded, and the high-voltage GIS double-bus wiring device for uninterrupted expansion in the first aspect,

The input end of the high-voltage GIS double-bus wiring device for uninterrupted power expansion is connected with the high-voltage GIS power distribution equipment, and the output end of the high-voltage GIS double-bus wiring device for uninterrupted power expansion is connected with the high-voltage GIS equipment to be expanded.

The beneficial effects are realized:

In the uninterrupted power-off extension high-voltage GIS double-bus wiring device, the extension protection assembly is formed by the extension gas gap insulation unit, the circuit breaker, the current transformer, the three-station switch and the quick grounding switch, so that power off is not required during extension on the premise of ensuring safety, and meanwhile, the operation reliability after extension is improved by arranging the first working bus and the standby working bus.

Drawings

FIG. 1 is a schematic diagram of a high-voltage GIS double bus wiring for uninterrupted power extension in an embodiment of the invention;

FIG. 2 is a schematic diagram of a long gas gap in an embodiment of the invention;

FIG. 3 is a schematic diagram of a long gas gap to conductor coupling in an embodiment of the invention;

FIG. 4 is a double bus wire single wire version in an embodiment of the invention;

fig. 5 is a single line diagram of a reserved extension interval of a double bus connection in an embodiment of the present invention.

The high-voltage power supply comprises 10 parts of a first working bus, 11 parts of a first isolating switch, 20 parts of a standby working bus, 21 parts of a second isolating switch, 30 parts of a grounding switch, 40 parts of an air gap insulating unit, 50 parts of a circuit breaker, 60 parts of a current transformer, 70 parts of a three-station switch, 80 parts of a quick grounding switch, 100 parts of an extension port and 200 parts of an extension protection assembly.

Detailed Description

In order to make the technical scheme of the present invention better understood by those skilled in the art, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings.

It is to be understood that the specific embodiments and figures described herein are merely illustrative of the invention, and are not limiting of the invention.

It is to be understood that the various embodiments of the invention and the features of the embodiments may be combined with each other without conflict.

It is to be understood that only the portions relevant to the present invention are shown in the drawings for convenience of description, and the portions irrelevant to the present invention are not shown in the drawings.

It should be understood that each unit and module in the embodiments of the present invention may correspond to only one physical structure, may be formed by a plurality of physical structures, or may be integrated into one physical structure.

It will be appreciated that, without conflict, the functions and steps noted in the flowcharts and block diagrams of the present invention may occur out of the order noted in the figures.

It is to be understood that the flowcharts and block diagrams of the present invention illustrate the architecture, functionality, and operation of possible implementations of systems, apparatuses, devices, methods according to various embodiments of the present invention. Where each block in the flowchart or block diagrams may represent a unit, module, segment, code, or the like, which comprises executable instructions for implementing the specified functions. Moreover, each block or combination of blocks in the block diagrams and flowchart illustrations can be implemented by hardware-based systems that perform the specified functions, or by combinations of hardware and computer instructions.

It should be understood that the units and modules related in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, for example, the units and modules may be located in a processor.

The inventor provides that when the application is used, research is carried out on single-line type double-bus wiring, single-line type double-bus wiring reserved extension interval single-line and double-fracture isolation adopted by a bus isolating switch:

example 1:

The implementation provides a high-voltage GIS double-bus wiring device for uninterrupted power extension, which comprises a first working bus 10, a first isolating switch 11, a standby working bus 20, a second isolating switch 21, a grounding switch 30, an extension port 100 and an extension protection assembly 200, wherein the extension protection assembly 200 comprises a gas gap insulating unit 40, a circuit breaker 50, a current transformer 60, a three-station switch 70 and a quick grounding switch 80;

The first isolating switch 11 is connected with the output end of the first working bus 11 to form a first series output branch;

The second isolating switch 21 is connected with the output end of the standby working bus 20 to form a second serial output branch, and the second serial output is connected with the first serial output in parallel to form a first parallel output branch;

one end of the grounding switch 30 is connected with the first parallel output branch circuit, and the other end of the grounding switch is grounded;

The first parallel output branch is sequentially connected with the gas gap insulation unit 40, the circuit breaker 50, the current transformer 60, the three-position switch 70 and the quick grounding switch 80 in series to form a third serial output branch, wherein the quick grounding switch 80 is used for opening or closing the quick grounding switch of an output line, the three-position switch 70 is used for line isolation and line grounding of an outgoing line side, the outgoing line side current transformer 60 is used for current measurement and current protection of the outgoing line side, the circuit breaker 50 is used for opening and closing an output line, and the gas gap insulation unit 40 is used for insulating the first parallel output and the circuit breaker 50;

extension port 100 is connected to the third serial output branch.

Specifically, the gas gap insulating unit 40 is an insulating housing and a long gas gap formed by insulating gas in the insulating housing, one end of the insulating housing is connected with the first parallel output and used for insulating the first parallel output, and the other end of the insulating housing is connected with a circuit breaker and used for insulating the circuit breaker. Wherein, the material of the insulating shell is mica, asbestos or glass, and the insulating gas in the insulating shell is clean air, nitrogen or sulfur hexafluoride. After the extension and power frequency withstand voltage handover test is finished, the gas gap insulation unit is modified into a conductor connection mode.

Specifically, the circuit breaker 50 is one of an oil circuit breaker, a sulfur hexafluoride circuit breaker, a vacuum circuit breaker, and a compressed air circuit breaker, the three-position switch 70 is a three-position load switch, and the fast grounding switch is a fast grounding switch with a switch action time of less than 0.15 s.

In particular embodiments, the gas gap insulating unit 40 may be a gas gap switch, in which clean air, nitrogen, or sulfur hexafluoride is used as an insulating medium between the first parallel output and the circuit breaker 50. When the gas gap switch is on, there is a gas gap between the first parallel output and the circuit breaker 50, and when the gas gap switch is off, the first parallel output and the circuit breaker 50 are directly connected, equivalent to a conductor connection.

In order to further realize uninterrupted power extension, the uninterrupted power extension high-voltage GIS double-bus wiring device further comprises a controller, wherein the controller is respectively connected with the first isolating switch 11, the second isolating switch 21, the grounding switch 30, the gas gap insulating unit 40, the circuit breaker 50, the current transformer 60, the three-position switch 70 and the quick grounding switch 80 and is used for controlling the first isolating switch 11, the second isolating switch 21, the grounding switch 30, the gas gap insulating unit 40, the circuit breaker 50, the current transformer 60, the three-position switch 70 and the quick grounding switch 80. In particular, the controller may be an STM32 controller or an ATmega328 controller, which are popular in the market.

As shown in fig. 1, the specific process of implementing uninterrupted extension in this embodiment is as follows:

In the first stage, the first working bus 10, the standby working bus 20, the first isolating switch 11, the second isolating switch 21, the grounding switch 30, the high-insulation-performance long gas gap 40 for extension and other elements are installed and put into operation, wherein the I bus isolating switch 11 is in a switching-off state, the II bus isolating switch 21 is in a switching-off position, the grounding switch 30 is in a switching-off position, and the gas gap insulating unit 40 (i.e., the high-insulation-performance long gas gap for extension) is in a switching-off position, and the specific high-insulation-performance long gas gap for extension is shown in fig. 2.

And in the second stage, long-term engineering extension is carried out, and extension equipment is installed and debugged. Circuit breaker 50, current transformer 60, three-position switch (three-position switch for isolating ground combination) 70, fast ground switch 80. When the extension starts, the grounding switch 30 is switched on, so that the personal safety of the installer is electrically ensured. And installing extension equipment sequentially. After the basic debugging of the extension equipment is finished, the voltage withstand test is ready to be performed, at this time, the gas gap insulating unit 40 (i.e., the extension high-insulation long gas gap) is in the opening position, the circuit breaker 50 is in the closing state, the three-position switch 70 is in the isolating closing state, the grounding switch is in the opening state, and the quick grounding switch 80 is in the opening state.

And thirdly, long-term engineering extension, and carrying out power frequency withstand voltage handover test on extension equipment. And carrying out power frequency withstand voltage handover test on the extension interval from the extension side. In the industrial frequency withstand voltage handover test, if the extension part discharges to the ground, the gas gap insulating unit 40 (i.e. the extension high-insulation long gas gap) is isolated, so that no influence is generated on the live operation bus (including the first working bus 10 and the standby working bus 20), and even if the gas gap insulating unit 40 (i.e. the extension high-insulation long gas gap) breaks down, the discharge current directly flows into the ground through the grounding switch 30 due to the closing position of the grounding switch 30, so that no influence is generated on the live operation bus (including the first working bus 10 and the standby working bus 20).

And a fourth stage, namely a commissioning stage of extension equipment. After the extension interval withstand voltage is completed, the grounding switch 30 is opened, the gas gap insulating unit 40 (i.e., the extension high-insulation long gas gap) is modified into a conductor connection type (see fig. 3), and other operations are the same as the normal double bus scheduling.

Typical double bus connection single line type is shown in fig. 4, and typical double bus connection reserved extension interval single line type is shown in fig. 5. As can be seen from fig. 4 and fig. 5, if there is only one isolation break between the extension interval and the operation bus, the power failure treatment is required to be performed on the original operation bus when the GIS standby interval handover withstand voltage test is performed (mainly preventing reverse overlapping of overvoltage at two ends of the isolation break during the handover test, which may cause discharge breakdown of the break, and further cause a grid accident). For an operation unit, the coordination of power failure of a bus of a transformer substation means delay of engineering progress, waste of manpower and material resources and direct or indirect economic loss caused by power failure. Therefore, in the high-voltage GIS double-bus wiring device for uninterrupted extension, the outlet side component is formed by the extension gas gap insulation unit, the circuit breaker, the current transformer, the three-station switch and the quick grounding switch, so that the uninterrupted extension is not required to be powered off under the premise of ensuring safety, and meanwhile, the operation reliability after extension is improved by arranging the first working bus and the standby working bus.

Example 2:

Based on the same technical concept as embodiment 1, the embodiment provides a transformer substation, which comprises high-voltage GIS power distribution equipment and high-voltage GIS equipment to be expanded, and further comprises the high-voltage GIS double-bus wiring device for uninterrupted power expansion described in embodiment 1, wherein the input end of the high-voltage GIS double-bus wiring device for uninterrupted power expansion is connected with the high-voltage GIS power distribution equipment, and the output end of the high-voltage GIS double-bus wiring device for uninterrupted power expansion is connected with the high-voltage GIS equipment to be expanded.

It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.

Claims (7)

1. The utility model provides a do not have a power failure and expand and use high voltage GIS double bus termination, its characterized in that, the device includes:

the device comprises a first working bus (10) and a first isolating switch (11), wherein the first isolating switch (11) is connected with the output end of the first working bus (10) to form a first series output branch;

The device comprises a standby working bus (20) and a second isolating switch (21), wherein the second isolating switch (21) is connected with the output end of the standby working bus (20) to form a second serial output branch, and the second serial output branch is connected with the first serial output branch in parallel to form a first parallel output branch;

The grounding switch (30), one end of the grounding switch (30) is connected with the first parallel output branch, and the other end of the grounding switch (30) is grounded;

Extension protection component (200), extension protection component (200) includes gas gap insulation unit (40), circuit breaker (50), current transformer (60), three station switch (70), and quick earthing switch (80) are used for the quick earthing switch brake-off of output line or quick earthing switch combined floodgate, three station switch (70) are used for the line isolation and the line grounding of outlet side, current transformer (60) are used for the current measurement and the current protection of outlet side, circuit breaker (50) are used for output line disconnection and switching on, gas gap insulation unit (40) are used for insulating first parallel output branch road and circuit breaker (50);

The first parallel output branch is sequentially connected with the gas gap insulation unit (40), the circuit breaker (50), the current transformer (60), the three-position switch (70) and the quick grounding switch (80) in series to form a third serial output branch;

-an extension port (100), said extension port (100) being connected to the output of said third serial output branch.

2. The high-voltage GIS double-bus wiring device for uninterrupted power extension according to claim 1, wherein,

The gas gap insulating unit (40) comprises an insulating housing and a long gas insulating gap formed by insulating gas arranged in the insulating housing,

One end of the insulating shell is connected with the first parallel output branch and is used for insulating the first parallel output branch,

The other end of the insulating shell is connected with the circuit breaker (50) and used for insulating the circuit breaker (50).

3. The high-voltage GIS double-bus wiring device for uninterrupted power expansion according to claim 2, wherein the insulating shell is made of mica, asbestos or glass,

The insulating gas in the insulating shell is clean air, nitrogen or sulfur hexafluoride.

4. The high-voltage GIS double-bus wiring device for uninterrupted power extension according to claim 1, wherein,

The breaker (50) is one of an oil breaker, a sulfur hexafluoride breaker, a vacuum breaker and a compressed air breaker.

5. The high-voltage GIS double-bus wiring device for uninterrupted power extension according to claim 1, wherein,

The three-position switch (70) is a three-position load switch.

6. The high-voltage GIS double-bus wiring device for uninterrupted power extension according to claim 1, wherein,

The fast grounding switch is a fast grounding switch with the switch action time less than 0.15 s.

7. A transformer substation is characterized by comprising high-voltage GIS power distribution equipment, high-voltage GIS equipment to be expanded and a high-voltage GIS double-bus wiring device for uninterrupted expansion according to any one of claims 1-6,

The input end of the high-voltage GIS double-bus wiring device for uninterrupted power expansion is connected with the high-voltage GIS power distribution equipment, and the output end of the high-voltage GIS double-bus wiring device for uninterrupted power expansion is connected with the high-voltage GIS equipment to be expanded.