Bus grounding switch interlocking system and substation power distribution system

Abstract

The invention relates to a bus grounding switch interlocking system and a transformer substation power distribution system, and the system comprises a power transmission bus, a locking miniature bus, a voltage transformer cabinet, and a plurality of incoming and outgoing line circuit breaker cabinets, and the incoming and outgoing line circuit breaker cabinets and the voltage transformer cabinet are connected with the power transmission bus. And a first end of the locking miniature bus is connected with a power supply through a grounding switch of the voltage transformer cabinet, and a second end of the locking miniature bus is connected with each incoming and outgoing line circuit breaker cabinet and is used for performing interlocking control on each incoming and outgoing line circuit breaker cabinet. By laying the locking miniature bus on each electrical cabinet, the power supply interlocking control of each electrical cabinet is realized, the complexity of electrical interlocking wiring is reduced, and the safety and reliability in the operation process of a power system are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of substation interlocking connection, in particular to a busbar grounding switch interlocking system and a substation power distribution system. BACKGROUND

[0002] In the current conventional substation, when the busbar of the double busbar connection is maintained, in order to ensure the maintenance safety of the electrical equipment and the busbar, a grounding switch or a grounding device is installed on each busbar. With the continuous construction of the power grid and the increasing demand for power consumption, the existing busbar grounding switch electrical interlocking connection is complicated, and once an error occurs, the electrical interlocking fails, which can cause harm to the human body, equipment and power grid.

[0003] In the current conventional substation, when the busbar of the double busbar connection is maintained, in order to ensure the maintenance safety of the electrical equipment and the busbar, a grounding switch or a grounding device is installed on each busbar, so as to form reliable maintenance grounding protection. With the continuous expansion of the power grid and the exponential growth of the load power demand, the system operation mode is becoming more and more complex, and higher requirements are put forward for the safety interlocking performance of the busbar grounding switch.

[0004] The current busbar grounding switch electrical interlocking system still adopts the traditional mode of installing a grounding switch or a grounding device on each busbar. The complex interlocking connection requires a large number of control cables to be laid, which not only increases the construction difficulty and maintenance cost, but also easily leads to interlocking failure due to wiring errors, seriously threatening the personal safety of maintenance personnel, and may cause damage to electrical equipment and even power grid accidents. Such safety hazards are particularly prominent in the operating environment of modern substations with high voltage and large capacity, and a more reliable busbar grounding switch interlocking solution is urgently needed. SUMMARY

[0005] Therefore, it is necessary to provide a busbar grounding switch interlocking system and a substation power distribution system capable of improving reliability in view of the above technical problems.

[0006] In a first aspect, the present application provides a busbar grounding switch interlocking system, comprising a power transmission busbar, a locking small busbar, a voltage transformer cabinet and a plurality of incoming and outgoing line circuit breaker cabinets, each of the incoming and outgoing line circuit breaker cabinets and the voltage transformer cabinet is connected to the power transmission busbar, a first end of the locking small busbar is connected to a power supply through a grounding switch of the voltage transformer cabinet, and a second end of the locking small busbar is connected to each of the incoming and outgoing line circuit breaker cabinets for interlocking control of each of the incoming and outgoing line circuit breaker cabinets.

[0007] In one embodiment, the busbar grounding switch interlocking system further comprises a trigger circuit breaker connected to the power supply and the grounding switch of the voltage transformer cabinet.

[0008] In one of the embodiments, the incoming and outgoing line circuit breaker cabinet comprises an incoming line circuit breaker cabinet and a plurality of outgoing line circuit breaker cabinets, each of the incoming and outgoing line circuit breaker cabinets is connected to the power transmission bus, and each of the incoming and outgoing line circuit breaker cabinets is connected to the second end of the locking bus.

[0009] In one of the embodiments, the bus grounding switch interlocking system further comprises a bus tie cabinet, when the number of the power transmission buses is more than one, the bus tie cabinet is arranged between each of the power transmission buses, and the bus tie cabinet is connected to the second end of the locking bus.

[0010] In one of the embodiments, the bus tie cabinet comprises a bus tie circuit breaker cabinet and a bus tie isolation cabinet, the bus tie circuit breaker cabinet is connected to the bus tie isolation cabinet, the bus tie circuit breaker cabinet and the bus tie isolation cabinet are connected to different power transmission buses, and each of the bus tie circuit breaker cabinet and the bus tie isolation cabinet is connected to the second end of the locking bus.

[0011] In one of the embodiments, the grounding switch of the voltage transformer cabinet is a normally closed switch, which is opened when grounded.

[0012] In one of the embodiments, the incoming and outgoing line circuit breaker cabinet comprises a closing locking loop and a live display loop, both of which are connected in parallel and connected to the second end of the locking bus after being connected in parallel.

[0013] In one of the embodiments, the circuit breaker of the incoming and outgoing line circuit breaker cabinet is electrically connected to the power transmission bus when the closing condition is met, the closing condition is that the grounding switch of the voltage transformer cabinet is not grounded and the high-voltage side of the live display loop is not live, or the grounding switch of the voltage transformer cabinet is not grounded and the three-position switch of the closing locking loop is not grounded.

[0014] In one of the embodiments, the closing locking loop further comprises a locking expansion relay contact connected in series to the air pressure gauge of the closing locking loop, when the detected air pressure of the air pressure gauge is lower than the set locking action threshold, the locking expansion relay contact is opened, and the circuit breaker of the incoming and outgoing line circuit breaker cabinet cannot be closed.

[0015] In a second aspect, the application further provides a power distribution system of a substation, which comprises a transformer and a bus grounding switch interlocking system as described above.

[0016] The bus grounding switch interlocking system and the transformer substation distribution system, comprising a power transmission bus, a locking small bus, a voltage transformer cabinet and a plurality of incoming and outgoing line circuit breaker cabinets, each incoming and outgoing line circuit breaker cabinet and the voltage transformer cabinet are connected to the power transmission bus, the first end of the locking small bus is connected to the power supply through the grounding switch of the voltage transformer cabinet, and the second end of the locking small bus is connected to each incoming and outgoing line circuit breaker cabinet, for interlocking control of each incoming and outgoing line circuit breaker cabinet. By laying the locking small bus on each electrical cabinet, the power supply interlocking control of each electrical cabinet is realized, the complexity of electrical interlocking wiring is reduced, and the safety and reliability of the power system during operation are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 Structure diagram of the bus grounding switch interlocking system in one embodiment;

[0019] Figure 2 Electrical schematic diagram of the locking small bus in one embodiment;

[0020] Figure 3 Structure diagram of the bus grounding switch interlocking system in another embodiment;

[0021] Figure 4 Locking schematic diagram of the circuit breaker cabinet in one embodiment;

[0022] Figure 5 Locking schematic diagram of the bus isolation cabinet in one embodiment. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments. The embodiments of the present application are shown in the drawings, but the present application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0024] It can be understood that the terms "first", "second", and the like used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of the present application, a first resistor can be referred to as a second resistor, and similarly, a second resistor can be referred to as a first resistor. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0025] It can be understood that "connection" in the following embodiments should be understood as "electrical connection", "communication connection" and the like if the circuits, modules, units and the like connected by the connection have transmission of electrical signals or data between each other.

[0026] It can be understood that "at least one" means one or more, and "multiple" means two or more. "At least part of the element" means part or all of the element.

[0027] As used herein, the singular forms "a", "an" and "the" can include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "comprise / comprising" or "have / having" or the like specifies the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in the specification includes any and all combinations of the related listed items.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0029] The bus grounding switch interlocking system provided by the embodiments of the present application can be applied to the application environment of the medium voltage power supply and distribution system of a substation. It can involve the connection of buses between various electrical cabinets of the substation, wherein the electrical cabinets can be air-filled cabinets. Electrical interlocking is a logical control relationship established between multiple control signals, which is a kind of linkage control mode between electrical equipment. Through the bus grounding switch interlocking system provided in the embodiments of the present application, interlocking control between multiple electrical cabinets can be simply and easily realized, the complexity of electrical interlocking wiring is reduced, and the safety and reliability in the operation of the substation are improved.

[0030] In one embodiment, the present application provides a bus grounding switch interlocking system, such as Figure 1As shown, the bus grounding switch interlocking system includes a power transmission bus, a blocking small bus, a voltage transformer cabinet 104, and a plurality of incoming and outgoing line circuit breaker cabinets 102, each of the incoming and outgoing line circuit breaker cabinets 102 and the voltage transformer cabinet 104 is connected to the power transmission bus, the first end of the blocking small bus is connected to the power supply through the grounding switch of the voltage transformer cabinet 104, and the second end of the blocking small bus is connected to each of the incoming and outgoing line circuit breaker cabinets 102, for interlocking control of each of the incoming and outgoing line circuit breaker cabinets 102.

[0031] Among them, the power transmission bus as the core conductor of power distribution is usually single bus or double bus structure, used for transmission of electric energy. The incoming and outgoing line circuit breaker cabinet includes a circuit breaker, which supplies power to the connected load by connecting the power transmission bus during operation, and in this embodiment, the DC power supply during operation is supplied by the blocking small bus. The voltage transformer cabinet, also known as the PT cabinet, includes a grounding switch and a voltage transformer, which is a control node of the interlocking system, and changes the on-off state of the blocking small bus by closing and opening the grounding switch. The blocking small bus connects the DC power supply through the grounding switch of the voltage transformer cabinet and transmits the DC power supply to each of the incoming and outgoing line circuit breaker cabinets, which can be specifically transmitted to the closing interlocking loop of each of the incoming and outgoing line circuit breaker cabinets.

[0032] Specifically, the on-off state of the blocking small bus can control the operation of the incoming and outgoing line circuit breaker cabinet, that is, the interlocking control of multiple electrical cabinets is realized through the grounding switch of the voltage transformer cabinet. Exemplarily, when the grounding switch of the voltage transformer cabinet is in the ungrounded state, the power supply can provide power to the blocking small bus through the normally closed contact of the grounding switch, the blocking small bus is live, and in turn can deliver the electric energy of the power supply to each of the incoming and outgoing line circuit breaker cabinets, enabling the closing circuit of the circuit breaker therein.

[0033] In one embodiment, the bus grounding switch interlocking system further includes a trigger circuit breaker, which is connected to the power supply and the grounding switch of the voltage transformer cabinet.

[0034] As shown, Figure 2 The trigger circuit breaker is a small circuit breaker 6MCB, the grounding switch of the voltage transformer cabinet is a bus grounding switch normally closed contact QE, the first end of the blocking small bus +BS, -BS is connected to the DC power supply +KM, -KM through the small circuit breaker 6MCB, and the bus grounding switch normally closed contact QE is connected in series between the small circuit breaker 6MCB and the first end of the blocking small bus. Among them, FW1, FW2, FW3 and FW4 are flame-retardant wiring terminals.

[0035] In this embodiment, the trigger circuit breaker can be manually or automatically switched on and off to control whether the blocking small bus is powered on. For example, during maintenance, the worker manually disconnects the small circuit breaker 6MCB to force the power off. By setting the trigger circuit breaker, the control of the blocking small bus can be more flexible, convenient to operate, and improve the convenience.

[0036] Further, in one of the embodiments, the grounding switch of the voltage transformer cabinet is a normally closed switch, which is opened when grounded. When the grounding switch of the voltage transformer cabinet is grounded, it may mean that a fault occurs, or a worker switches into a maintenance state, at which time it is necessary to ensure that the associated circuit breaker cannot be closed to avoid the risk of live operation. Therefore, designing the grounding switch of the voltage transformer cabinet as a normally closed switch is conducive to ensuring the safety of the power system,

[0037] In the above embodiment, the bus grounding switch interlocking system includes a power transmission bus, a locking small bus, a voltage transformer cabinet, and a plurality of incoming and outgoing line circuit breaker cabinets. Each incoming and outgoing line circuit breaker cabinet and the voltage transformer cabinet are connected to the power transmission bus. The first end of the locking small bus is connected to the power supply through the grounding switch of the voltage transformer cabinet, and the second end of the locking small bus is connected to each incoming and outgoing line circuit breaker cabinet for interlocking control of each incoming and outgoing line circuit breaker cabinet. By laying the locking small bus on each electrical cabinet, power interlocking control of each electrical cabinet is achieved, reducing the complexity of electrical interlocking wiring and ensuring the safety and reliability of the power system during operation.

[0038] In one of the embodiments, the bus grounding switch interlocking system further includes a bus tie cabinet. When the number of power transmission buses is multiple, the bus tie cabinet is arranged between each power transmission bus, and the bus tie cabinet is connected to the second end of the locking small bus.

[0039] Specifically, the bus tie cabinet is an electrical cabinet that connects each power transmission bus and needs to achieve electrical isolation while performing circuit breaking control. When there are multiple power transmission buses and they need to be connected, each power transmission bus is connected through the bus tie cabinet, which can achieve electrical control between multiple power transmission buses, such as closing or maintaining a certain section of the power transmission bus.

[0040] Further, in one of the embodiments, the bus tie cabinet includes a bus tie circuit breaker cabinet and a bus tie isolation cabinet. The bus tie circuit breaker cabinet is connected to the bus tie isolation cabinet, and the bus tie circuit breaker cabinet and the bus tie isolation cabinet are connected to different power transmission buses. The bus tie circuit breaker cabinet and the bus tie isolation cabinet are both connected to the second end of the locking small bus.

[0041] Specifically, the bus tie circuit breaker cabinet is connected to the bus tie isolation cabinet, and both are connected to different power transmission buses. The bus tie circuit breaker cabinet is used for load switching, which realizes the electrical connection or isolation of two sections of the power transmission bus and can quickly cut off the current in the event of a fault to protect system equipment. The bus tie isolation cabinet is used to provide a visible disconnect point between the power transmission buses to ensure maintenance safety, and in cooperation with the bus tie circuit breaker cabinet, it can ensure the safe use of the power system.

[0042] In one of the embodiments, the incoming and outgoing line circuit breaker cabinet includes an incoming line circuit breaker cabinet and a plurality of outgoing line circuit breaker cabinets, the incoming line circuit breaker cabinet and each outgoing line circuit breaker cabinet are connected to the power transmission bus, and the incoming line circuit breaker cabinet and each outgoing line circuit breaker cabinet are connected to the second end of the blocking small bus.

[0043] As shown in Figure 3 , two sections of power transmission incoming lines are included, which are A section and B section, and are constructed based on different power transmission buses. The A section power transmission incoming line includes an A-#1 incoming line circuit breaker cabinet, an A-#3 PT cabinet, A-#4-10 outgoing line circuit breaker cabinets, and an A section power transmission bus. The B section power transmission incoming line includes a B-#1 incoming line circuit breaker cabinet, a B-#3 PT cabinet, B-#4-10 outgoing line circuit breaker cabinets, and a B section bus. Among them, the A-#1 incoming line circuit breaker cabinet, the A-#3 PT cabinet, and the A-#4-10 outgoing line circuit breaker cabinets are connected in parallel to the A section bus; the B-#1 incoming line circuit breaker cabinet, the B-#3 PT cabinet, and the B-#4-10 outgoing line circuit breaker cabinets are connected in parallel to the B section bus; and the two sections of buses are connected through a bus tie circuit breaker cabinet A-#11 and a bus tie isolation cabinet B-#11.

[0044] Taking the various electrical cabinets of the foregoing embodiments as examples, the control of the blocking small bus is exemplarily described. The circuit breaker cabinet includes a bus tie circuit breaker cabinet, an incoming line circuit breaker cabinet, and an outgoing line circuit breaker cabinet, and the incoming and outgoing line circuit breaker cabinets are taken as examples for description.

[0045] In one of the embodiments, the incoming and outgoing line circuit breaker cabinet includes a closing blocking loop and a live display loop, the closing blocking loop and the live display loop are connected in parallel, and the parallel connection is connected to the second end of the blocking small bus.

[0046] As shown in Figure 4 , the blocking loop of the incoming and outgoing line circuit breaker cabinet includes a live display loop (live display power supply loop) and a closing blocking loop (closing loop). The live display power supply loop includes a power supply DXN:1-2 of the live display (the live display is simultaneously connected to the closing blocking loop), the live display DXN:2 is connected to the positive pole +BS of the second end of the blocking small bus, and the live display DXN:1 is connected to the negative pole -BS of the second end of the blocking small bus.

[0047] The closing circuit includes three-position grounding switch QS: 13-14, latching normally closed contact of live display DXN: 12-13, latching extended relay normally closed contact of air gauge KA: 61-62, and closing latching point QV: 10-20 of the circuit breaker. The three-position switch QS: 13 is connected with the positive pole +BS of the latching small bus, the live display DXN: 13 is connected with the latching extended relay KA: 61, the three-position switch QS: 14 is connected with the latching extended relay KA: 61, the latching extended relay KA: 62 is connected with the circuit breaker QV: 10, and the circuit breaker QV: 20 is connected with the negative pole -BS of the latching small bus.

[0048] Further, in one of the embodiments, the circuit breaker of the incoming and outgoing line circuit breaker cabinet is electrically connected with the power transmission bus under the condition that the closing condition is met, and the closing condition is that the grounding switch of the voltage transformer cabinet is not grounded and the high-voltage side of the live display circuit is not live, or the grounding switch of the voltage transformer cabinet is not grounded and the three-position switch of the closing latching circuit is not grounded.

[0049] The closing operation of the circuit breaker needs to meet the following three electrical interlocking conditions at the same time: Figure 2 The grounding switch of the voltage transformer cabinet in the closing latching circuit is not grounded (the QE contact is closed), which ensures that the power transmission bus is not in the maintenance grounding state, and the latching small bus (+BS / -BS) remains energized; the live display (DXN) in the live display circuit also accesses the closing latching circuit, and when the live display is not live on the side close to the closing latching circuit, that is, the high-voltage side of the live display circuit is not live (the DXN: 12-13 contact is closed), the power transmission bus is verified to have no residual voltage by the voltage sensor, preventing live closing; the three-position switch is in a non-grounded state (the QS: 13-14 contact is closed), which confirms that the associated isolating switch is not misgrounded, avoiding the risk of short circuit. That is, when the grounding switch is in the ungrounded state, the live display monitors the high side to be not live or the three-position switch is in the ungrounded state, the circuit breaker cabinet can allow the circuit breaker to close.

[0050] In the embodiment, the latching small bus integrates the grounding switch state, voltage detection, and isolation device position signal to form a mandatory interlock, realize multi-dimensional safety verification, and improve the safety and closing reliability of the power system.

[0051] As shown in Figure 4 In one of the embodiments, the closing latching circuit further includes the latching extended relay contact of the air gauge in series in the closing latching circuit, and when the detected air pressure of the air gauge is lower than the set latching action threshold, the latching extended relay contact is disconnected, and the circuit breaker of the incoming and outgoing line circuit breaker cabinet cannot be closed.

[0052] Wherein, in the GIS system, the pressure of SF6 or other insulating gas is a key parameter for the safe operation of the equipment. Insufficient gas pressure will lead to a decrease in insulation performance or loss of arc extinguishing ability.

[0053] Alternatively, the electrical cabinet of each embodiment in the present application can be selected or replaced with a GIS type. When the gas pressure table detects that the gas pressure is lower than the set locking action threshold, the locking extension relay acts to cut off the circuit breaker power supply and prevent the circuit breaker from closing.

[0054] Further, the locking extension relay contacts of the gas pressure table can also be connected in series in the corresponding circuit breaker opening circuit, i.e. the locking extension contacts of the gas pressure table are connected in series in the closing locking circuit and the opening circuit of the circuit breaker respectively. When the detected gas pressure of the gas pressure table is lower than the set locking action threshold, the locking extension relay contacts disconnect the closing locking circuit and also disconnect the opening circuit, and the circuit is in a state that cannot be operated, and it is not necessary to select one circuit to close.

[0055] In the present embodiment, by connecting the locking extension relay contacts of the gas pressure table in series in the closing circuit, the operation circuit can be forcibly cut off when the gas pressure table detects that the gas pressure is lower than the set locking action threshold, and a multiple error prevention system is formed with the grounding switch, the live display, etc., thereby improving the reliability of the circuit breaker closing of the incoming and outgoing line circuit breaker cabinet.

[0056] The following takes the locking circuit of the bus isolation cabinet as an example, as shown in Figure 5 , the control of the locking bus bar is exemplarily described.

[0057] The locking circuit of the bus isolation cabinet (hereinafter referred to as the isolation cabinet) includes a three-position switch control power supply circuit, a three-position isolation closing circuit, a three-position isolation opening circuit, a three-position grounding closing circuit, a three-position grounding opening circuit, and a locking isolation circuit. The second end of the locking bus bar + BS, - BS is connected to the three-position switch QS: Y6-Y7 through a small circuit breaker 3MCB, and when the bus grounding switch QE is in a non-grounding state, the small circuit breaker 3MCB is closed, and the three-position switch power supply is turned on.

[0058] The three-position isolation closing circuit includes a manual isolation closing circuit and a remote control isolation closing circuit. The manual isolation closing circuit is used when the remote / local switch QK is set to local QK: 5-6, the isolation closing / opening switch KK1 is set to closing KK1: 1-2, and the three-position switch is in the isolation closing state. The remote control isolation closing circuit is used when the remote / local switch QK is set to remote QK: 7-8, and the background is connected to the isolation closing circuit, i.e. the three-position switch is in the isolation closing state.

[0059] The three-position isolation circuit includes a manual isolation circuit and a remote control isolation circuit. In the manual isolation circuit, when the remote / local switch QK is turned to the local QK:5-6 and the isolation opening and closing switch KK1 is turned to the open KK1:3-4, the three-position switch is in the isolation state. In the remote control isolation circuit, when the remote / local switch QK is turned to the remote QK:7-8 and the background is connected to the isolation circuit, the three-position switch can be remotely controlled to the isolation state.

[0060] The logic of the three-station grounding circuit and grounding branch circuit is the same as the above, so they will not be repeated here.

[0061] The locking isolation circuit and the three-position locking isolation point QS: Y5 are connected to the normally closed point QV: 54-55 of the main circuit breaker cabinet. When the circuit breaker of the main circuit breaker cabinet is in the closed state, the three-position switch of the isolation cabinet cannot be electrically operated.

[0062] Based on the same technical concept, the present application also provides a substation power distribution system, which includes a transformer and a busbar grounding switch interlocking system as described in the above embodiments. The transformer is connected to the busbar grounding switch interlocking system, capable of transmitting the power output by the transformer to the busbar grounding switch interlocking system, which then distributes it to downstream loads.

[0063] In order to better understand the above solution, a detailed explanation is given below in conjunction with a specific embodiment.

[0064] In one embodiment, a busbar grounding switch interlocking system includes two sections of incoming power lines. Each section includes an incoming circuit breaker cabinet, an outgoing circuit breaker cabinet, a PT cabinet, a busbar, and a busbar grounding switch. The incoming circuit breaker cabinet, the outgoing circuit breaker cabinet, and the PT cabinet are connected in parallel to the busbars, and the busbar grounding switch is installed in the PT cabinet. The transmission buses of the two sections of the incoming power lines are connected via a busbar tie circuit breaker cabinet and a busbar tie isolation cabinet.

[0065] like Figure 3 As shown, the busbar grounding switch interlocking system includes two sections of incoming transmission lines, Section A and Section B, built on different transmission busbars. Section A's incoming transmission line includes the incoming circuit breaker panel A-#1, the PT panel A-#3, the outgoing circuit breaker panels A-#4 to 10, and the Section A transmission busbar. Section B's incoming transmission line includes the incoming circuit breaker panel B-#1, the PT panel B-#3, the outgoing circuit breaker panels B-#4 to 10, and the Section B busbar. The incoming circuit breaker panel A-#1, the PT panel A-#3, and the outgoing circuit breaker panels A-#4 to 10 are connected in parallel to the Section A busbar; the incoming circuit breaker panel B-#1, the PT panel B-#3, and the outgoing circuit breaker panels B-#4 to 10 are connected in parallel to the Section B busbar. The two busbar sections are connected via the bus tie circuit breaker panel A-#11 and the bus tie isolation panel B-#11.

[0066] Further, the locking small busbar, the bus grounding switch normally closed contact (the grounding switch of the PT cabinet), the DC power supply, the DC power supply is connected with the locking small busbar through the bus grounding switch normally closed contact, each circuit breaker cabinet is electrically interlocked through the locking small busbar. Wherein, the bus grounding switch is in the ungrounded state.

[0067] In the embodiment, each circuit breaker cabinet is interlocked through a locking small busbar, thereby reducing the complexity of the electrical interlocking wiring, greatly reducing the manufacturing cost, and ensuring the safety and reliability of the power system.

[0068] In the description of the specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0069] Each technical feature of the above-described embodiments can be combined arbitrarily, and in order to make the description simple, each technical feature in the above-described embodiments is not described all possible combinations, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0070] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the scope of the present application. It should be pointed out that for ordinary skilled in the art, on the premise of not departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A busbar grounding switch interlocking system, characterized in that: It includes a transmission bus, a locking small bus, a voltage transformer cabinet and multiple incoming and outgoing line circuit breaker cabinets. Each incoming and outgoing line circuit breaker cabinet and the voltage transformer cabinet are connected to the transmission bus. The first end of the locking small bus is connected to the power supply through the grounding switch of the voltage transformer cabinet. The second end of the locking small bus is connected to each incoming and outgoing line circuit breaker cabinet for interlocking control of each incoming and outgoing line circuit breaker cabinet.

2. The busbar grounding switch interlocking system according to claim 1, characterized in that: The busbar grounding switch interlocking system further includes a trigger circuit breaker, which connects the power supply and the grounding switch of the voltage transformer cabinet.

3. The busbar grounding switch interlocking system according to claim 1, characterized in that: The incoming and outgoing circuit breaker cabinets include an incoming circuit breaker cabinet and multiple outgoing circuit breaker cabinets. The incoming circuit breaker cabinet and each of the outgoing circuit breaker cabinets are connected to the transmission busbar, and the incoming circuit breaker cabinet and each of the outgoing circuit breaker cabinets are connected to the second end of the locking small busbar.

4. The busbar grounding switch interlocking system according to claim 1, characterized in that: The busbar grounding switch interlocking system further includes a busbar coupling cabinet. When there are multiple transmission busbars, the busbar coupling cabinet is arranged between the transmission busbars, and the busbar coupling cabinet is connected to the second end of the locking small busbar.

5. The busbar grounding switch interlocking system according to claim 4, characterized in that: The bus tie cabinet includes a bus tie circuit breaker cabinet and a bus tie isolation cabinet. The bus tie circuit breaker cabinet is connected to the bus tie isolation cabinet. The bus tie circuit breaker cabinet and the bus tie isolation cabinet are connected to different transmission busbars. The bus tie circuit breaker cabinet and the bus tie isolation cabinet are both connected to the second end of the locked small busbar.

6. The busbar grounding switch interlocking system according to any one of claims 1 to 5, characterized in that: The grounding switch of the voltage transformer cabinet is a normally closed switch and is disconnected when grounded.

7. The busbar grounding switch interlocking system according to any one of claims 1 to 5, characterized in that: The incoming and outgoing line circuit breaker cabinet includes a closing lockout circuit and a live display circuit. The closing lockout circuit and the live display circuit are connected in parallel and connected to the second end of the locking small busbar after being connected in parallel.

8. The busbar grounding switch interlocking system according to claim 7, characterized in that: The circuit breaker of the incoming and outgoing line circuit breaker cabinet is electrically connected to the transmission bus when the closing conditions are met. The closing conditions are: the grounding switch of the voltage transformer cabinet is not grounded and the high-voltage side of the energized indicator circuit is not energized, or the grounding switch of the voltage transformer cabinet is not grounded and the three-position switch of the closing lock circuit is not grounded.

9. The busbar grounding switch interlocking system according to claim 7, characterized in that: The closing lockout circuit also includes a lockout extension relay contact of a pressure gauge connected in series in the closing lockout circuit. When the detected air pressure of the pressure gauge is lower than the set lockout action threshold, the lockout extension relay contact is disconnected, and the circuit breaker of the incoming and outgoing line circuit breaker cabinet cannot be closed.

10. A substation power distribution system, characterized in that: The substation power distribution system includes a transformer and a busbar grounding switch interlocking system according to any one of claims 1 to 9.

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