10kV switch cabinet external interlocking loop

Abstract

The utility model discloses an external interlocking loop of a 10kV switch cabinet. The external interlocking loop of the 10kV switch cabinet comprises a locking power supply, an air switch, a cable chamber front and back door locking loop, a PT fusing lightning arrester handcart locking loop and a PT grounding handcart locking loop. The positive electrode and the negative electrode of the locking power supply are connected with the air switch, and the air switch is electrically connected with the cable chamber front and back door locking loop, the PT fusing lightning arrester handcart locking loop and the PT grounding handcart locking loop. The utility model solves the technical problems that the existing electrical interlocking loop is simple in structure and low in safety, and the electrified grounding handcart is pushed mistakenly when the electrified display fails and outputs error information.

Description

Technical Field

[0001] This utility model relates to the field of power technology, and in particular to an external interlocking circuit for a 10kV switchgear. Background Technology

[0002] High-voltage power transmission and transformation systems refer to large-scale power systems used for transmitting electrical energy, mainly composed of transmission lines, substations, and related equipment. They play a crucial role in energy transmission and distribution, transmitting electricity generated by power plants over long distances and converting it into low-voltage electricity suitable for users through substations. As a core component of modern power systems, they are essential for ensuring the stability and reliability of power supply. Therefore, any misoperation can lead to significant hidden dangers. Consequently, in high-voltage power transmission and transformation systems, all high-voltage electrical equipment that could potentially cause misoperation should be equipped with corresponding electrical interlocking circuits. Existing electrical interlocking circuits are relatively simple, using only the output node of the energized busbar status indicator as the interlocking condition. This interlocking method is too simplistic and has low security. When the energized indicator malfunctions and outputs incorrect information, it may lead to the accidental activation of the grounding handcart while energized. Therefore, there is an urgent need to propose an external interlocking circuit for 10kV switchgear to solve the technical problem of the existing electrical interlocking circuit's simple structure, low security, and the technical issue of accidental activation of the grounding handcart when the energized indicator malfunctions and outputs incorrect information. Utility Model Content

[0003] The main purpose of this utility model is to propose an external interlocking circuit for 10kV switchgear, which aims to solve the technical problem that the existing electrical interlocking circuit has a simple structure, low safety, and causes the grounding handcart to be accidentally pushed when the live display fails and outputs incorrect information.

[0004] To achieve the above objectives, this utility model provides an external interlocking circuit for a 10kV switchgear, wherein the external interlocking circuit for the 10kV switchgear includes:

[0005] The system includes a power supply interlock, an air switch, a cable compartment front and rear door interlock circuit, a PT fuse arrester truck interlock circuit, and a PT grounding truck interlock circuit. The positive and negative terminals of the power supply interlock are connected to the air switch, and the air switch is electrically connected to the cable compartment front and rear door interlock circuit, the PT fuse arrester truck interlock circuit, and the PT grounding truck interlock circuit, respectively.

[0006] In one preferred embodiment, the air switch includes a first miniature circuit breaker and a second miniature circuit breaker;

[0007] One end of the first miniature circuit breaker is connected to the interlocking power supply, and the other end of the first miniature circuit breaker is connected to one end of the interlocking circuit of the front and rear doors of the cable room, the interlocking circuit of the PT fuse arrester truck, and the interlocking circuit of the PT grounding truck, respectively.

[0008] One end of the second miniature circuit breaker is connected to the interlocking power supply, and the other end of the second miniature circuit breaker is connected to the interlocking circuit of the front and rear doors of the cable compartment, the interlocking circuit of the PT fuse arrester truck, and the interlocking circuit of the PT grounding truck.

[0009] In one preferred embodiment, the interlocking circuit for the front and rear doors of the cable compartment includes a front lower door electromagnetic lock, a rear lower door electromagnetic lock, a PT grounding trolley test position, and a PT-side live indicator. One end of the front lower door electromagnetic lock is connected to an air switch and one end of the rear lower door electromagnetic lock, the other end of the front lower door electromagnetic lock is connected to the other end of the rear lower door electromagnetic lock and the PT grounding trolley test position, the other end of the PT grounding trolley test position is connected to the PT-side live indicator, and the other end of the PT-side live indicator is connected to the air switch.

[0010] In one preferred embodiment, the PT fuse arrester truck interlocking circuit includes a PT fuse arrester truck chassis interlocking electromagnet, a switchgear rear door limit switch, and a cable compartment front door limit switch; one end of the PT fuse arrester truck chassis interlocking electromagnet is connected to an air switch, the other end of the PT fuse arrester truck chassis interlocking electromagnet is connected to the switchgear rear door limit switch, the other end of the switchgear rear door limit switch is connected to the cable compartment front door limit switch, and the other end of the cable compartment front door limit switch is connected to an air switch.

[0011] In one preferred embodiment, the PT grounding truck interlocking circuit includes a PT grounding truck chassis interlocking electromagnet, a PT fuse arrester truck test position, and a busbar-side live indicator; one end of the PT grounding truck chassis interlocking electromagnet is connected to an air switch, the other end of the PT grounding truck chassis interlocking electromagnet is connected to the PT fuse arrester truck test position, the other end of the PT fuse arrester truck test position is connected to the busbar-side live indicator, and the other end of the busbar-side live indicator is connected to an air switch.

[0012] One preferred embodiment is that the PT fuse arrester handcart test location includes, in sequence, the #1 grounding transformer cabinet, outgoing line 1-3 switch cabinets, busbar equipment, outgoing line 4-8 switch cabinets, #1 capacitor cabinet, #2 capacitor cabinet, outgoing line 9-11 switch cabinets, #1 main transformer incoming line cabinet, outgoing line 12-14 switch cabinets and #1 isolation cabinet.

[0013] One preferred embodiment is that the PT fuse arrester handcart test location includes, in sequence, a 10kV #1 grounding transformer cabinet, 10kV outgoing line 1-3 switch cabinets, 10kV busbar equipment, 10kV outgoing line 4-8 switch cabinets, 10kV #1 capacitor cabinet, 10kV #2 capacitor cabinet, 10kV outgoing line 9-11 switch cabinets, 10kV #1 main transformer incoming line cabinet, 10kV outgoing line 12-14 switch cabinets, and 10kV #1 isolation cabinet.

[0014] In the above-mentioned technical solution of this utility model, the external interlocking circuit of the 10kV switchgear includes: a locking power supply, an air switch, a cable compartment front and rear door locking circuit, a PT fuse arrester trolley locking circuit, and a PT grounding trolley locking circuit. The positive and negative terminals of the locking power supply are connected to the air switch, and the air switch is electrically connected to the cable compartment front and rear door locking circuit, the PT fuse arrester trolley locking circuit, and the PT grounding trolley locking circuit, respectively. This utility model, based on the original interlocking system, connects the trolley test positions of the other cabinets in the cabinet arrangement (excluding the PT cabinet) in series. This ensures that all power to the busbar in this section is cut off when the grounding trolley is pushed in, and that the grounding trolley can only be pushed in when the busbar is not energized. This solves the technical problem that existing electrical interlocking circuits have simple structures, low safety, and cause erroneous pushing of the grounding trolley when the energized indicator malfunctions and outputs incorrect information. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of an external interlocking circuit for a 10kV switchgear according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the series circuit at the test position of the PT fuse arrester in an embodiment of this utility model.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0021] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] See Figure 1 This utility model provides an external interlocking circuit for a 10kV switchgear, wherein the external interlocking circuit includes: a locking power supply, an air switch, a cable compartment front and rear door interlocking circuit, a PT fuse arrester truck interlocking circuit, and a PT grounding truck interlocking circuit; the positive and negative terminals of the locking power supply are connected to the air switch, and the air switch is electrically connected to the cable compartment front and rear door interlocking circuit, the PT fuse arrester truck interlocking circuit, and the PT grounding truck interlocking circuit, respectively.

[0023] Specifically, in this embodiment, the air switch includes a first miniature circuit breaker and a second miniature circuit breaker; one end of the first miniature circuit breaker FB31+ is connected to the positive terminal of the interlocking power supply, the positive terminal of which is +BSM; the other end of the first miniature circuit breaker FB31+ is connected to one end of the cable compartment front and rear door interlocking circuit, the PT fuse arrester truck interlocking circuit, and the PT grounding truck interlocking circuit, respectively; one end of the second miniature circuit breaker FB31- is connected to the negative terminal of the interlocking power supply, the negative terminal of which is -BSM; the second miniature circuit breaker FB31- is connected to the other end of the cable compartment front and rear door interlocking circuit, the PT fuse arrester truck interlocking circuit, and the PT grounding truck interlocking circuit, respectively; the first miniature circuit breaker and the second miniature circuit breaker serve as power switches for the circuits.

[0024] Specifically, in this embodiment, the cable compartment front and rear door interlocking circuit includes a front lower door electromagnetic lock-RL1, a rear lower door electromagnetic lock-RL2, a PT grounding trolley test position S8, and a PT-side live indicator-PU2. One end of the front lower door electromagnetic lock-RL1 is connected to one end of the second miniature circuit breaker FB31- and one end of the rear lower door electromagnetic lock-RL2. The other end of the front lower door electromagnetic lock-RL1 is connected to the other end of the rear lower door electromagnetic lock-RL2 and the PT grounding trolley test position S8. The other end of the PT grounding trolley test position S8 is connected to the PT-side live indicator-PU2, and the other end of the PT-side live indicator-PU2 is connected to the first miniature circuit breaker FB31+. The front lower door electromagnetic lock-RL1 is used to lock the front lower door, and the rear lower door electromagnetic lock-RL2 is used to lock the rear lower door.

[0025] Specifically, in this embodiment, the PT fuse arrester truck interlocking circuit includes a PT fuse arrester truck chassis interlocking electromagnet Y0, a switchgear rear door limit switch -BDB9, and a cable compartment front door limit switch -BDB3; one end of the PT fuse arrester truck chassis interlocking electromagnet Y0 is connected to the second miniature circuit breaker FB31-, the other end of the PT fuse arrester truck chassis interlocking electromagnet Y0 is connected to the switchgear rear door limit switch -BDB9, the other end of the switchgear rear door limit switch -BDB9 is connected to the cable compartment front door limit switch -BDB3, and the other end of the cable compartment front door limit switch -BDB3 is connected to the first miniature circuit breaker FB31+; the PT fuse arrester truck chassis interlocking electromagnet Y0 is used to interlock the truck.

[0026] Specifically, in this embodiment, the PT grounding truck interlocking circuit includes a PT grounding truck chassis interlocking electromagnet Y0, a PT fuse arrester truck test position S8, and a busbar-side live indicator - PU1; one end of the PT grounding truck chassis interlocking electromagnet Y0 is connected to the second miniature circuit breaker FB31-, the other end of the PT grounding truck chassis interlocking electromagnet Y0 is connected to the PT fuse arrester truck test position S8, the other end of the PT fuse arrester truck test position S8 is connected to the busbar-side live indicator - PU1, and the other end of the busbar-side live indicator - PU1 is connected to the first miniature circuit breaker FB31+; the PT grounding truck chassis interlocking electromagnet Y0 is used to interlock the truck.

[0027] Specifically, in this embodiment, see Figure 2The test location for the PT fuse arrester includes, in sequence, the #1 grounding transformer cabinet, the outgoing line 1-3 switch cabinets, the busbar equipment, the outgoing line 4-8 switch cabinets, the #1 capacitor cabinet, the #2 capacitor cabinet, the outgoing line 9-11 switch cabinets, the #1 main transformer incoming line cabinet, the outgoing line 12-14 switch cabinets, and the #1 isolation cabinet.

[0028] Specifically, in this embodiment, the test location of the PT fuse arrester includes, in sequence, a 10kV #1 grounding transformer cabinet, 10kV outgoing line 1-3 switch cabinets, 10kV busbar equipment, 10kV outgoing line 4-8 switch cabinets, 10kV #1 capacitor cabinet, 10kV #2 capacitor cabinet, 10kV outgoing line 9-11 switch cabinets, 10kV #1 main transformer incoming line cabinet, 10kV outgoing line 12-14 switch cabinets, and 10kV #1 isolation cabinet.

[0029] Specifically, in this embodiment, the external interlocking circuit of the 10kV switchgear connects the test positions of the handcarts of all cabinets except the PT cabinet in the cabinet arrangement in series on the basis of the original interlocking. This ensures that all power to the busbar in this section is cut off when the grounding handcart is pushed in, and that the grounding handcart can only be pushed in when the busbar is not energized. This solves the technical problem that the existing electrical interlocking circuit has a simple structure, low safety, and causes the grounding handcart to be pushed in accidentally when the live indicator outputs an erroneous message. The grounding handcart can only be pushed in smoothly when the circuit meets the requirements that the live indicator detects that the busbar is not energized and the handcarts of all cabinets on the busbar in this section are in the test position. This utility model can effectively prevent the grounding handcart from being pushed in accidentally when energized during later maintenance and repair through the external interlocking circuit of the 10kV switchgear, avoid personal injury, equipment and power grid accidents caused by misoperation, and improve the safety of later operation and maintenance.

[0030] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. An external interlocking circuit for a 10kV switchgear, characterized in that, The external interlocking circuit of the 10kV switchgear includes an interlocking power supply, an air switch, an interlocking circuit for the front and rear doors of the cable compartment, an interlocking circuit for the PT fuse arrester truck, and an interlocking circuit for the PT grounding truck. The positive and negative terminals of the interlocking power supply are connected to the air switch, and the air switch is electrically connected to the interlocking circuits for the front and rear doors of the cable compartment, the interlocking circuits for the PT fuse arrester truck, and the interlocking circuits for the PT grounding truck, respectively.

2. The external interlocking circuit for a 10kV switchgear according to claim 1, characterized in that, The air switch includes a first miniature circuit breaker and a second miniature circuit breaker; One end of the first miniature circuit breaker is connected to the interlocking power supply, and the other end of the first miniature circuit breaker is connected to one end of the interlocking circuit of the front and rear doors of the cable room, the interlocking circuit of the PT fuse arrester truck, and the interlocking circuit of the PT grounding truck, respectively. One end of the second miniature circuit breaker is connected to the interlocking power supply, and the other end of the second miniature circuit breaker is connected to the interlocking circuit of the front and rear doors of the cable compartment, the interlocking circuit of the PT fuse arrester truck, and the interlocking circuit of the PT grounding truck.

3. The external interlocking circuit for a 10kV switchgear according to any one of claims 1-2, characterized in that, The cable compartment front and rear door interlocking circuit includes a front lower door electromagnetic lock, a rear lower door electromagnetic lock, a PT grounding trolley test position, and a PT-side live indicator. One end of the front lower door electromagnetic lock is connected to an air switch and one end of the rear lower door electromagnetic lock. The other end of the front lower door electromagnetic lock is connected to the other end of the rear lower door electromagnetic lock and the PT grounding trolley test position. The other end of the PT grounding trolley test position is connected to the PT-side live indicator, and the other end of the PT-side live indicator is connected to the air switch.

4. An external interlocking circuit for a 10kV switchgear according to any one of claims 1-2, characterized in that, The PT fuse arrester truck interlocking circuit includes a PT fuse arrester truck chassis interlocking electromagnet, a switchgear rear door limit switch, and a cable compartment front door limit switch. One end of the PT fuse arrester truck chassis interlocking electromagnet is connected to an air switch, the other end of the PT fuse arrester truck chassis interlocking electromagnet is connected to the switchgear rear door limit switch, the other end of the switchgear rear door limit switch is connected to the cable compartment front door limit switch, and the other end of the cable compartment front door limit switch is connected to an air switch.

5. An external interlocking circuit for a 10kV switchgear according to any one of claims 1-2, characterized in that, The PT grounding truck interlocking circuit includes a PT grounding truck chassis interlocking electromagnet, a PT fuse arrester truck test position, and a busbar-side live indicator; one end of the PT grounding truck chassis interlocking electromagnet is connected to an air switch, the other end of the PT grounding truck chassis interlocking electromagnet is connected to the PT fuse arrester truck test position, the other end of the PT fuse arrester truck test position is connected to the busbar-side live indicator, and the other end of the busbar-side live indicator is connected to an air switch.

6. The external interlocking circuit for a 10kV switchgear according to claim 5, characterized in that, The test location for the PT fuse arrester includes, in sequence, the #1 grounding transformer cabinet, outgoing line 1-3 switch cabinets, busbar equipment, outgoing line 4-8 switch cabinets, #1 capacitor cabinet, #2 capacitor cabinet, outgoing line 9-11 switch cabinets, #1 main transformer incoming line cabinet, outgoing line 12-14 switch cabinets, and #1 isolation cabinet.

7. The external interlocking circuit for a 10kV switchgear according to claim 6, characterized in that, The test location for the PT fuse arrester includes, in sequence, the following components connected in series: 10kV #1 grounding transformer cabinet, 10kV outgoing line 1-3 switch cabinets, 10kV busbar equipment, 10kV outgoing line 4-8 switch cabinets, 10kV #1 capacitor cabinet, 10kV #2 capacitor cabinet, 10kV outgoing line 9-11 switch cabinets, 10kV #1 main transformer incoming line cabinet, 10kV outgoing line 12-14 switch cabinets, and 10kV #1 isolation cabinet.

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