Circuit for preventing misoperation of high-voltage control loop and high-voltage cabinet

Abstract

The utility model discloses a circuit for high pressure control loop prevents misoperation and high voltage cabinet for solving the problem that the control loop of high voltage switch cabinet in prior art can exist the condition of allowing local misoperation, lack effective isolation measures in the switching of test position and working position, provide a kind of circuit for high pressure control loop prevents misoperation and high voltage cabinet.The circuit includes the following components: +KM control bus, -KM control bus, remote / local conversion switch unit QK, handcart test position switch SW7, split brake switch SW8 unit KK, machine side brake switch SW3, DCS closing switch SW4, DCS brake switch SW6.Remote / local conversion switch unit QK is connected with +KM control bus;Remote / local conversion switch unit QK includes local switch SW1 and remote switch SW2, and it is a pair of interlocking switch;Split brake switch SW8 unit KK includes brake switch SW8 and brake switch SW8, and it is a pair of interlocking switch.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage switchgear technology, and in particular to a circuit and a high-voltage switchgear for preventing misoperation in high-voltage control circuits. Background Technology

[0002] In the field of power system transmission, distribution and control technology, high-voltage switchgear, as a key electrical device for realizing circuit connection, disconnection, protection and status monitoring, is widely used in substations, industrial production plants and high-rise building power distribution systems. Its operational stability is directly related to the overall safety of the power system and the operational safety of maintenance personnel.

[0003] The control circuits of existing high-voltage switchgear may allow for local misoperation, lacking effective isolation measures when switching between test and operating positions. For example, operators might mistakenly close the switch locally while the equipment is in the operating position, leading to equipment damage and personnel safety accidents. Utility Model Content

[0004] This invention addresses the problem that existing high-voltage switchgear control circuits may allow for local misoperation and lack effective isolation measures during switching between test and working positions. It provides a circuit and high-voltage switchgear for preventing misoperation in high-voltage control circuits.

[0005] The technical solution adopted in this utility model is:

[0006] The circuit disclosed in this utility model for preventing misoperation in high-voltage control circuits includes the following components:

[0007] +KM control bus, +KM control bus is connected to the positive terminal of the power supply and is used to supply power to the circuit;

[0008] -KM control bus, -KM control bus is connected to the negative terminal of the power supply and is also used to supply power to the circuit;

[0009] The remote / local transfer switch unit QK is connected to the +KM control bus. The remote / local transfer switch unit QK includes a local switch SW1 and a remote switch SW2. The local switch SW1 and the remote switch SW2 are a pair of interlocked switches to prevent the local switch SW1 and the remote switch SW2 from closing or opening at the same time.

[0010] Handcart test position switch SW7 is connected to local switch SW1;

[0011] The trip switch unit KK includes trip switch SW8 and trip switch SW8, which are also a pair of interlocked switches. Trip switch SW8 allows trip switch SW5 to be connected to the TQ trip coil and trip switch SW8 to be connected to the HQ closing coil through DCS.

[0012] The local trip switch SW3 is connected to the remote switch SW2 and the DCS-permitted trip switch SW5.

[0013] DCS closing switch SW4 is connected in parallel with the machine-side tripping switch SW3.

[0014] DCS trip switch SW6 is connected to the +KM control bus and the TQ trip coil.

[0015] Both the TQ trip coil and the HQ closing coil are connected to the -KM control bus.

[0016] Furthermore, the handcart test position switch SW7 is a normally closed contact.

[0017] Furthermore, the DCS closing switch SW4 is connected to the DCS tripping switch SW5 via a high-voltage integrated protection device.

[0018] Furthermore, a miniature circuit breaker DK1 is installed between the +KM control bus and the remote / local transfer switch unit QK, the machine-side trip switch SW3, and the DCS trip switch SW6.

[0019] Furthermore, a miniature circuit breaker DK2 is installed between the -KM control bus and the TQ trip coil and the HQ closing coil.

[0020] Furthermore, the voltage between the -KM control bus and the +KM control bus is 220V.

[0021] Based on the same inventive concept, this utility model also provides a high-voltage switchgear, including the aforementioned circuit for preventing misoperation of the high-voltage control circuit.

[0022] The beneficial effects of this utility model are: by connecting a normally closed test position in the circuit, the test position and the working position are interlocked, ensuring that the circuit can only be closed remotely when the circuit is in the working position, thereby preventing local misoperation, reducing the risk of misoperation, and ensuring the safety of both personnel and equipment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a circuit diagram for a high-voltage control circuit designed to prevent malfunctions. Detailed Implementation

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0027] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0028] As attached Figure 1 As shown, the circuit for preventing misoperation in a high-voltage control circuit disclosed in this embodiment includes the following components:

[0029] +KM control bus, +KM control bus is connected to the positive terminal of the power supply and is used to supply power to the circuit;

[0030] -KM control bus, -KM control bus is connected to the negative terminal of the power supply and is also used to supply power to the circuit;

[0031] The remote / local transfer switch unit QK is connected to the +KM control bus. The remote / local transfer switch unit QK includes a local switch SW1 and a remote switch SW2. The local switch SW1 and the remote switch SW2 are a pair of interlocked switches to prevent the local switch SW1 and the remote switch SW2 from closing or opening at the same time.

[0032] Handcart test position switch SW7 is connected to local switch SW1;

[0033] The trip switch unit KK includes trip switch SW8 and trip switch SW8, which are also a pair of interlocked switches. Trip switch SW8 allows trip switch SW5 to be connected to the TQ trip coil and trip switch SW8 to be connected to the HQ closing coil through DCS.

[0034] The local trip switch SW3 is connected to the remote switch SW2 and the DCS-permitted trip switch SW5.

[0035] DCS closing switch SW4 is connected in parallel with the machine-side tripping switch SW3.

[0036] DCS trip switch SW6 is connected to the +KM control bus and the TQ trip coil.

[0037] Both the TQ trip coil and the HQ closing coil are connected to the -KM control bus.

[0038] Furthermore, the handcart test position switch SW7 is a normally closed contact.

[0039] Furthermore, the DCS closing switch SW4 is connected to the DCS tripping switch SW5 via a high-voltage integrated protection device.

[0040] Furthermore, a miniature circuit breaker DK1 is installed between the +KM control bus and the remote / local transfer switch unit QK, the machine-side trip switch SW3, and the DCS trip switch SW6.

[0041] Furthermore, a miniature circuit breaker DK2 is installed between the -KM control bus and the TQ trip coil and the HQ closing coil.

[0042] Furthermore, the voltage between the -KM control bus and the +KM control bus is 220V.

[0043] Based on the same inventive concept, this embodiment also provides a high-voltage switchgear, including the aforementioned circuit for preventing misoperation of the high-voltage control circuit.

[0044] The working principle of the circuit used to prevent misoperation in the high-voltage control circuit is as follows:

[0045] I. Core Functional Logic

[0046] The high-voltage motor control circuit is designed with dual-mode operation permission control for both test position and remote position. Precise isolation of operation permissions is achieved by inserting a normally closed contact in series with the test position. The specific functions are as follows:

[0047] 1. Operational characteristics of the test location

[0048] When the control circuit switch is switched to the test position, the normally closed contact of the test position (handcart test position switch) in the series circuit remains closed, and the local operating circuit of the high-voltage cabinet remains conductive.

[0049] It supports local operation of motor switching via the switching buttons on the high-voltage switch panel;

[0050] The operating logic is consistent with the normal operating state and can be used for scenarios such as on-site debugging and circuit continuity detection.

[0051] Detailed explanation:

[0052] The voltage between the +KM and -KM control busbars is 220V. When miniature circuit breakers DK1 and DK2 are closed and energized, after being switched to local position, 1-2 (local switch SW1) is energized. The current flow is +KM->SW1->SW7->SW8->SW5->HQ closing coil->-KM. The normally closed contacts B11 and B12 (handcart test position switch SW7) are closed, and 3-4 (opening switch SW8) is open. Then, the power supply passes through the internal contacts of the Nanjing Automation high-voltage integrated protection device. 107-107a (DCS allowable closing SW5) closes after the process conditions are met. Then, the power returns to -KM through the HQ closing coil, forming a closing circuit. The local circuit breaker closing is completed.

[0053] The voltage between the +KM and -KM control busbars is 220V. When miniature circuit breakers DK1 and DK2 are closed and energized, and then switched to local position, 1-2 (local switch SW1) is energized. The current flow is +KM->SW1->SW7->SW9->TQ trip coil->-KM. The normally closed contacts B11 and B12 (handcart test position switch SW7) of the handcart test position are closed, and the 1KK manual trip switch 1-2 (trip switch SW8) is opened. Then the power supply passes through the internal contacts of the Nanjing Automation high-voltage integrated protection device, and then returns to -KM through the TQ trip coil, forming a tripping circuit. The local circuit breaker tripping is completed.

[0054] 2. Remote location permission restrictions

[0055] When the control circuit switch is switched to the remote position, the normally closed contact of the test position (handcart test position switch) in the series circuit opens simultaneously, directly cutting off the local operation circuit of the high-voltage cabinet:

[0056] The local trip / close button has lost its operational effectiveness;

[0057] Only retain the opening and closing operation permissions of the remote control terminal (such as DCS system) to avoid conflicts between local and remote operations.

[0058] Detailed explanation:

[0059] The voltage between the +KM and -KM control busbars is 220V. When miniature circuit breakers DK1 and DK2 are closed and energized, and the remote circuit is activated, 3-4 (remote switch SW2) is energized. The current flow is +KM->SW2->SW4->SW5->HQ closing coil->-KM. The DCS closing switch SW4 is normally closed. Then, the power supply passes through the internal contact of the Nanjing Automation high-voltage integrated protection device. 107-107a (DCS allows closing SW5) closes after the process conditions are met. Then, the power returns to -KM through the HQ closing coil, forming a closing circuit. The remote circuit breaker closing is completed.

[0060] The voltage between the +KM and -KM control busbars is 220V. When miniature circuit breakers DK1 and DK2 are closed and energized, the current flows as follows: +KM -> SW6 -> TQ trip coil -> -KM. The DCS trips and remains normally closed. The power supply then passes through the internal contacts of the Nanjing Automation high-voltage integrated protection device, and then returns to -KM through the TQ trip coil, forming a tripping circuit. The remote circuit breaker tripping is complete.

[0061] Note: When in the local position, the normally closed contacts B11 and B12 (turntable test position switch SW7) of the trolley test position are closed. When the circuit breaker trolley is switched to the remote position and the circuit breaker trolley is moved to the working position, the normally closed contacts B11 and B12 (turntable test position switch SW7) of the trolley test position are opened, which serves as a protection function. At this time, only remote operation is possible, and the local operation function is lost.

[0062] The beneficial effects of the circuit used above for preventing misoperation in high-voltage control circuits are as follows: By connecting a normally closed test position in the circuit, the test position and the working position are interlocked, ensuring that the circuit can only be closed remotely when in the working position, thereby preventing local misoperation, reducing the risk of misoperation, and ensuring the safety of both personnel and equipment.

Claims

1. A circuit for preventing misoperation in a high-voltage control circuit, characterized in that, include: +KM control bus, +KM control bus is connected to the positive terminal of the power supply and is used to supply power to the circuit; -KM control bus, -KM control bus is connected to the negative terminal of the power supply and is also used to supply power to the circuit; The remote / local transfer switch unit QK is connected to the +KM control bus. The remote / local transfer switch unit QK includes a local switch SW1 and a remote switch SW2. The local switch SW1 and the remote switch SW2 are a pair of interlocked switches to prevent the local switch SW1 and the remote switch SW2 from closing or opening at the same time. Handcart test position switch SW7 is connected to local switch SW1; The trip switch unit KK includes trip switch SW8 and trip switch SW8, which are also a pair of interlocked switches. Trip switch SW8 allows trip switch SW5 to be connected to the TQ trip coil and trip switch SW8 to be connected to the HQ closing coil through DCS. The local trip switch SW3 is connected to the remote switch SW2 and the DCS-permitted trip switch SW5. DCS closing switch SW4 is connected in parallel with the machine-side tripping switch SW3. DCS trip switch SW6 is connected to the +KM control bus and the TQ trip coil. Both the TQ trip coil and the HQ closing coil are connected to the -KM control bus.

2. The circuit for preventing misoperation in a high-voltage control circuit according to claim 1, characterized in that, The handcart test position switch SW7 is a normally closed contact.

3. The circuit for preventing malfunction in a high-voltage control circuit according to claim 1, characterized in that, DCS closing switch SW4 is connected to DCS tripping switch SW5 via high-voltage integrated protection.

4. The circuit for preventing misoperation in a high-voltage control circuit according to claim 1, characterized in that, A miniature circuit breaker DK1 is installed between the +KM control bus and the remote / local transfer switch unit QK, the machine-side trip switch SW3, and the DCS trip switch SW6.

5. The circuit for preventing misoperation in a high-voltage control circuit according to claim 1, characterized in that, -A miniature circuit breaker DK2 is installed between the KM control bus, the TQ trip coil, and the HQ closing coil.

6. The circuit for preventing malfunction in a high-voltage control circuit according to any one of claims 1-5, characterized in that, The voltage between the -KM control bus and the +KM control bus is 220V.

7. A high-voltage switchgear, characterized in that, Includes the circuit for preventing misoperation in a high-voltage control circuit as described in any one of claims 1-6.

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