Safety anti-misoperation circuit of high-voltage switch cabinet

Abstract

The utility model relates to a safety anti-misoperation circuit of a high-voltage switch cabinet, which comprises a positive electrode of a direct-current control bus, a negative electrode of the direct-current control bus, an auxiliary normally-closed switch, a segmented locking travel switch, an isolation normally-open switch, a vacuum circuit breaker and a microcomputer protection device, a connection point B16 in the microcomputer protection device is electrically connected with the positive electrode of the direct current control bus through a wire, and a connection point B13 in the microcomputer protection device is electrically connected with the negative electrode of the direct current control bus through a wire. A connection point B12 in the microcomputer protection device is electrically connected with a connection point 4 in the vacuum circuit breaker through a wire, and a connection point 14 in the vacuum circuit breaker is electrically connected with the negative electrode of the direct current control bus through a wire. A connecting point j of a spring operating mechanism in the vacuum circuit breaker is electrically connected with a connecting point 3 in the time relay and a connecting point 23 in the auxiliary normally-closed switch through wires, and a connecting point 1 in the time relay is electrically connected with a connecting point i of the spring operating mechanism in the vacuum circuit breaker through a wire. A connection point 33 in the auxiliary normally-closed switch is electrically connected with a connection point 49 in the segmented locking travel switch through a wire, and a connection point 50 in the segmented locking travel switch is electrically connected with a connection point 13 in the isolation normally-open switch through a wire. A connection point 14 in the isolation normally-open switch is electrically connected with a connection point 13 in the intermediate relay and a connection point 7 in the first time relay through wires, and the connection point 14 in the intermediate relay and a connection point 2 in the first time relay are electrically connected with the negative electrode of the direct-current control bus through wires. The safety anti-misoperation circuit for the high-voltage switch cabinet has the advantages that the safety anti-misoperation circuit for the high-voltage switch cabinet is additionally arranged between the disconnecting switch and the circuit breaker in the fixed type high-voltage switch cabinet, a better safety guarantee effect is achieved on the safety of operators, the safety coefficient of the operators is higher due to the safety anti-misoperation measures, and the safety anti-misoperation circuit has wide safety and applicability.

Description

Technical Field

[0001] This utility model belongs to the field of high voltage switchgear manufacturing technology, specifically relating to a safety anti-misoperation circuit for high voltage switchgear. Background Technology

[0002] According to one of the "five protections" requirements for high-voltage switchgear—preventing disconnecting switches from being pulled under load—the safe operation requirements are: the disconnecting switch must be closed before the circuit breaker can be closed; conversely, the disconnecting switch can only be opened after the circuit breaker has been opened.

[0003] However, in actual operation, it often happens that the circuit breaker is operated before the isolating switch is fully closed (the operating handle is still removed from the operating mechanism), which can cause the isolating switch to burn out and, in severe cases, even affect the safety of maintenance personnel.

[0004] To further ensure the operational safety of maintenance personnel, our company has developed a safety anti-misoperation circuit for high-voltage switchgear, which can improve the safety anti-misoperation performance between disconnecting switches and circuit breakers operated locally in the incoming and outgoing line cabinets. Utility Model Content

[0005] Design Objective: To overcome the shortcomings of the prior art, a safety anti-misoperation circuit for a high-voltage switchgear is designed, including the positive terminal and negative terminal of the DC control bus, an auxiliary normally closed switch, a segmented interlocking limit switch, an isolating normally open switch, a vacuum circuit breaker, and a microprocessor-based protection device. Connection point B16 of the microprocessor-based protection device is electrically connected to the positive terminal of the DC control bus via a wire, and connection point B13 of the microprocessor-based protection device is electrically connected to the negative terminal of the DC control bus via a wire. Connection point B12 of the microprocessor-based protection device is electrically connected to connection point 4 of the vacuum circuit breaker via a wire, and connection point 14 of the vacuum circuit breaker is electrically connected to the negative terminal of the DC control bus via a wire. Connection point j of the spring operating mechanism in the vacuum circuit breaker is connected to the negative terminal of the DC control bus via a wire. The connection point 1 in the time relay is electrically connected to the connection point 3 in the time relay and the connection point 23 in the auxiliary normally closed switch. The connection point 1 in the time relay is electrically connected to the connection point i in the spring operating mechanism of the vacuum circuit breaker through a wire. The connection point 33 in the auxiliary normally closed switch is electrically connected to the connection point 49 in the segmented locking limit switch through a wire. The connection point 50 in the segmented locking limit switch is electrically connected to the connection point 13 in the isolating normally open switch through a wire. The connection point 14 in the isolating normally open switch is electrically connected to the connection point 13 in the intermediate relay and the connection point 7 in the first time relay through wires. The connection points 14 in the intermediate relay and the connection point 2 in the first time relay are electrically connected to the negative terminal of the DC control bus through wires.

[0006] Preferably, connection point B11 in the microcomputer protection device is electrically connected to connection point 2 in the first changeover switch, connection point 5 in the first intermediate relay, connection point 2 in the first connecting piece, and one end of the first switch via wires. Connection point B14 in the microcomputer protection device is electrically connected to connection point 4 in the second changeover switch, connection point 2 in the second connecting piece, and one end of the second switch via wires. The other ends of the first switch and the second switch are electrically connected to connection point 4 in the third changeover switch via wires, and connection point 3 in the third changeover switch is electrically connected to the positive terminal of the DC control bus via wires. Connection points 1 in the first changeover switch and 3 in the second changeover switch are electrically connected to connection points 1 and 2 via wires. The connection point 2 in the fourth transfer switch is electrically connected to the positive terminal of the DC control bus via a wire. The connection point 9 in the first intermediate relay is electrically connected to the positive terminal of the DC control bus via a wire. The connection point 1 in the first connecting piece is electrically connected to the connection point B03 of the closing output in the microcomputer protection device via a wire. The connection point B01 of the closing output in the microcomputer protection device is electrically connected to the positive terminal of the DC control bus via a wire. The connection point 1 in the second connecting piece is electrically connected to the connection point B02 of the trip output in the microcomputer protection device via a wire. The connection point B01 of the trip output in the microcomputer protection device is electrically connected to the positive terminal of the DC control bus via a wire.

[0007] Preferably, the device further includes a first signal light, a second signal light, and a first vacuum circuit breaker. Connection point 1 of the first signal light is electrically connected to the positive terminal of the DC control bus via a wire, and connection point 2 of the first signal light is electrically connected to connection point 8 of the first vacuum circuit breaker via a wire. Connection point 1 of the second signal light is electrically connected to the positive terminal of the DC control bus via a wire, and connection point 2 of the second signal light is electrically connected to connection point 3 of the first vacuum circuit breaker via a wire. Connection point B15 of the microprocessor protection device is electrically connected to connection point 31 of the first vacuum circuit breaker via a wire. Connection point C02 of the microprocessor protection device is electrically connected to connection point 8 of the first vacuum circuit breaker via a wire. Connection point C01 of the microprocessor protection device is electrically connected to connection point 3 of the first vacuum circuit breaker via a wire. Connection points 13, 18, and 30 of the first vacuum circuit breaker are respectively electrically connected to the negative terminal of the DC control bus via wires.

[0008] Preferably, it also includes an electromagnetic lock and a live display. Connection points L and K1 in the live display are electrically connected to the positive terminal of the DC control bus via wires. Connection point N in the live display is electrically connected to the negative terminal of the DC control bus via wires. Connection point K2 in the live display is electrically connected to connection point S1 in the electromagnetic lock via wires, and connection point S2 in the electromagnetic lock is electrically connected to the negative terminal of the DC control bus via wires.

[0009] Preferably, a first circuit breaker is provided at the positive terminal of the DC control bus, and a second circuit breaker is provided at the negative terminal of the DC control bus.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] Connection point B16 in the microprocessor-based protection device is electrically connected to the positive terminal of the DC control bus via a wire, and connection point B13 in the microprocessor-based protection device is electrically connected to the negative terminal of the DC control bus via a wire. Connection point B12 in the microprocessor-based protection device is electrically connected to connection point 4 in the vacuum circuit breaker via a wire, and connection point 14 in the vacuum circuit breaker is electrically connected to the negative terminal of the DC control bus via a wire. Connection point j of the spring operating mechanism in the vacuum circuit breaker is electrically connected to connection point 3 in the time relay and connection point 23 in the auxiliary normally closed switch via wires. Connection point 1 of the time relay is electrically connected to connection point i of the spring operating mechanism in the vacuum circuit breaker via a wire. Connection point 33 of the auxiliary normally closed switch is electrically connected to connection point 49 in the segmented locking limit switch via a wire, and connection point 50 of the segmented locking limit switch is electrically connected to connection point 13 in the isolating normally open switch via a wire. Connection point 14 in the isolating normally open switch is electrically connected to connection point 13 in the intermediate relay and connection point 7 in the first time relay via wires. Connection points 14 in the intermediate relay and 2 in the first time relay are electrically connected to the negative terminal of the DC control bus via wires. A time-delay KT contact is connected in parallel to the contacts of the spring operating mechanism in the vacuum circuit breaker. This ensures that the vacuum circuit breaker can only be closed when the isolating normally open switch is closed locally, the SGL contact closes, the KT time relay is activated for 5 seconds, and then the KT time-delay contact closes, connecting the closing contact of the vacuum circuit breaker. This prevents the vacuum circuit breaker from closing before the isolating normally open switch is fully closed, thus ensuring the safety of the operator. Conversely, if a closing command for the vacuum circuit breaker is issued before the isolating normally open switch is closed, the time-delay relay is activated, the closing circuit is disconnected, and the vacuum circuit breaker cannot be closed, thus ensuring the safety of the operator. Attached Figure Description

[0012] Figure 1This is a schematic diagram of a safety anti-misoperation circuit for a high-voltage switchgear. Detailed Implementation

[0013] Example 1: Refer to Appendix Figure 1 A safety anti-misoperation circuit for a high-voltage switchgear includes a positive terminal of a DC control bus, a negative terminal of a DC control bus, an auxiliary normally closed switch 20, a segmented interlocking limit switch 21, an isolating normally open switch 22, a vacuum circuit breaker 5, and a microprocessor-based protection device 8. Connection point B16 of the microprocessor-based protection device 8 is electrically connected to the positive terminal of the DC control bus via a wire, and connection point B13 of the microprocessor-based protection device 8 is electrically connected to the negative terminal of the DC control bus via a wire. Connection point B12 of the microprocessor-based protection device 8 is electrically connected to connection point 4 of the vacuum circuit breaker 5 via a wire, and connection point 14 of the vacuum circuit breaker 5 is electrically connected to the negative terminal of the DC control bus via a wire. Connection point j of the spring operating mechanism of the vacuum circuit breaker 5 is connected to the connection point of the time relay 4 via wires. Point 3 and connection point 23 in the auxiliary normally closed switch 20 are electrically connected. Connection point 1 in the time relay 4 is electrically connected to connection point i of the spring operating mechanism in the vacuum circuit breaker 5 through a wire. Connection point 33 in the auxiliary normally closed switch 20 is electrically connected to connection point 49 in the segmented locking limit switch 21 through a wire, and connection point 50 in the segmented locking limit switch 21 is electrically connected to connection point 13 in the isolating normally open switch 22 through a wire. Connection point 14 in the isolating normally open switch 22 is electrically connected to connection point 13 in the intermediate relay 2 and connection point 7 in the first time relay 7 through wires. Connection point 14 in the intermediate relay 2 and connection point 2 in the first time relay 7 are electrically connected to the negative terminal of the DC control bus through wires.

[0014] The connection point B11 in the microcomputer protection device 8 is electrically connected via wires to connection point 2 in the first changeover switch 19, connection point 5 in the first intermediate relay 18, connection point 2 in the first connecting piece 14, and one end of the first switch 25. The connection point B14 in the microcomputer protection device 8 is electrically connected via wires to connection point 4 in the second changeover switch 11, connection point 2 in the second connecting piece 10, and one end of the second switch 26. The other end of the first switch 25 and the other end of the second switch 26 are electrically connected via wires to connection point 4 in the third changeover switch 13, and connection point 3 in the third changeover switch 13 is electrically connected via wires to the positive terminal of the DC control bus. Connection points 1 in the first changeover switch 19 and 3 in the second changeover switch 11 are electrically connected via wires... The wire is electrically connected to connection point 2 in the fourth changeover switch 17, and connection point 1 in the fourth changeover switch 17 is electrically connected to the positive terminal of the DC control bus via a wire. Connection point 9 in the first intermediate relay 18 is electrically connected to the positive terminal of the DC control bus via a wire. Connection point 1 in the first connecting piece 14 is electrically connected to connection point B03 in the closing output 15 of the microcomputer protection device 8 via a wire, and connection point B01 in the closing output 15 of the microcomputer protection device 8 is electrically connected to the positive terminal of the DC control bus via a wire. Connection point 1 in the second connecting piece 10 is electrically connected to connection point B02 in the trip output 12 of the microcomputer protection device 8 via a wire, and connection point B01 in the trip output 12 of the microcomputer protection device 8 is electrically connected to the positive terminal of the DC control bus via a wire.

[0015] It also includes a first signal light 23, a second signal light 24, and a first vacuum circuit breaker 6. Connection point 1 of the first signal light 23 is electrically connected to the positive terminal of the DC control bus via a wire, and connection point 2 of the first signal light 23 is electrically connected to connection point 8 of the first vacuum circuit breaker 6 via a wire. Connection point 1 of the second signal light 24 is electrically connected to the positive terminal of the DC control bus via a wire, and connection point 2 of the second signal light 24 is electrically connected to connection point 3 of the first vacuum circuit breaker 6 via a wire. Connection point B15 of the microcomputer protection device 8 is electrically connected to connection point 31 of the first vacuum circuit breaker 6 via a wire. Connection point C02 of the microcomputer protection device 8 is electrically connected to connection point 8 of the first vacuum circuit breaker 6 via a wire. Connection point C01 of the microcomputer protection device 8 is electrically connected to connection point 3 of the first vacuum circuit breaker 6 via a wire. Connection points 13, 18, and 30 of the first vacuum circuit breaker 6 are electrically connected to the negative terminal of the DC control bus via wires.

[0016] It also includes an electromagnetic lock 7 and a live indicator 9. Connection points L and K1 in the live indicator 9 are electrically connected to the positive terminal of the DC control bus via wires. Connection point N in the live indicator 9 is electrically connected to the negative terminal of the DC control bus via a wire. Connection point K2 in the live indicator 9 is electrically connected to connection point S1 in the electromagnetic lock 7 via a wire, and connection point S2 in the electromagnetic lock 7 is electrically connected to the negative terminal of the DC control bus via a wire. A first circuit breaker 16 is installed at the positive terminal of the DC control bus, and a second circuit breaker 1 is installed at the negative terminal of the DC control bus.

[0017] Protection operation process and principle:

[0018] 1. A time delay KT (time relay 4) contact is connected in parallel to the contacts of the spring operating mechanism in the vacuum circuit breaker 5 (a pair of contacts led out from the vacuum circuit breaker, namely connection point i and connection point j). Figure 1 The SGL at point 22 of the normally open isolating switch represents the electrical contact of a manual operating mechanism of the normally open isolating switch. Only after the normally open isolating switch is closed locally will the SGL contact close, activating the KT time relay (i.e., time relay 4). After 5 seconds, the KT delay contact will close, connecting the closing contact of the vacuum circuit breaker 5, thus preventing the vacuum circuit breaker 5 from closing before the normally open isolating switch is fully closed, ensuring the safety of the operator.

[0019] 2. Conversely, if a closing command is issued for the vacuum circuit breaker 5 when the normally open isolating switch is not closed, the time delay relay (i.e., time relay 4) will be activated, the closing circuit will be disconnected, and the vacuum circuit breaker 5 cannot be closed, thus ensuring the safety of the operator.

[0020] The added protection method between the disconnecting switch and the circuit breaker in a fixed high-voltage switchgear (i.e., the addition of a safety anti-misoperation circuit for the high-voltage switchgear) provides better safety assurance for operators. With this safety anti-misoperation measure, the safety factor for operators is higher, and it has broad safety and applicability.

[0021] It should be understood that although the above embodiments provide a relatively detailed textual description of the design concept of this utility model, these textual descriptions are merely simple textual descriptions of the design concept of this utility model, and not limitations on the design concept of this utility model. Any combination, addition, or modification that does not exceed the design concept of this utility model shall fall within the protection scope of this utility model.

Claims

1. A safety anti-misoperation circuit for a high-voltage switchgear, comprising the positive terminal of a DC control bus, the negative terminal of a DC control bus, an auxiliary normally closed switch (20), a segmented interlocking limit switch (21), an isolating normally open switch (22), a vacuum circuit breaker (5), and a microcomputer protection device (8), characterized in that: Connection point B16 in the microcomputer protection device (8) is electrically connected to the positive terminal of the DC control bus via a wire, and connection point B13 in the microcomputer protection device (8) is electrically connected to the negative terminal of the DC control bus via a wire. Connection point B12 in the microcomputer protection device (8) is electrically connected to connection point 4 in the vacuum circuit breaker (5) via a wire, and connection point 14 in the vacuum circuit breaker (5) is electrically connected to the negative terminal of the DC control bus via a wire. Connection point j of the spring operating mechanism in the vacuum circuit breaker (5) is electrically connected to connection point 3 in the time relay (4) and connection point 23 in the auxiliary normally closed switch (20) via wires. Connection point 1 in the time relay (4) is electrically connected to connection point 3 in the time relay (4) and connection point 23 in the auxiliary normally closed switch (20) via a wire. The connection point i of the spring operating mechanism in the vacuum circuit breaker (5) is electrically connected. The connection point 33 in the auxiliary normally closed switch (20) is electrically connected to the connection point 49 in the segmented locking limit switch (21) through the wire. The connection point 50 in the segmented locking limit switch (21) is electrically connected to the connection point 13 in the isolating normally open switch (22) through the wire. The connection point 14 in the isolating normally open switch (22) is electrically connected to the connection point 13 in the intermediate relay (2) and the connection point 7 in the first time relay (3) through the wire. The connection point 14 in the intermediate relay (2) and the connection point 2 in the first time relay (3) are electrically connected to the negative terminal of the DC control bus through the wire.

2. The safety anti-misoperation circuit for a high-voltage switchgear according to claim 1, characterized in that: Connection point B11 in the microcomputer protection device (8) is electrically connected to connection point 2 in the first changeover switch (19), connection point 5 in the first intermediate relay (18), connection point 2 in the first connecting piece (14), and one end of the first switch (25) via wires. Connection point B14 in the microcomputer protection device (8) is electrically connected to connection point 4 in the second changeover switch (11), connection point 2 in the second connecting piece (10), and one end of the second switch (26) via wires. The other end of the first switch (25) and the other end of the second switch (26) are electrically connected to connection point 4 in the third changeover switch (13) via wires, and connection point 3 in the third changeover switch (13) is electrically connected to the positive terminal of the DC control bus via wires. Connection point 1 in the first changeover switch (19) and connection point 3 in the second changeover switch (11) are respectively connected to the positive terminal of the DC control bus. The first intermediate relay (18) is electrically connected to the positive terminal of the DC control bus via a wire, and the connection point 1 of the fourth changeover switch (17) is electrically connected to the positive terminal of the DC control bus via a wire. The connection point 9 of the first intermediate relay (18) is electrically connected to the positive terminal of the DC control bus via a wire. The connection point 1 of the first connecting piece (14) is electrically connected to the connection point B03 of the closing output (15) of the microcomputer protection device (8) via a wire, and the connection point B01 of the closing output (15) of the microcomputer protection device (8) is electrically connected to the positive terminal of the DC control bus via a wire. The connection point 1 of the second connecting piece (10) is electrically connected to the connection point B02 of the trip output (12) of the microcomputer protection device (8) via a wire, and the connection point B01 of the trip output (12) of the microcomputer protection device (8) is electrically connected to the positive terminal of the DC control bus via a wire.

3. A safety anti-misoperation circuit for a high-voltage switchgear according to claim 1 or 2, characterized in that: It also includes a first signal light (23), a second signal light (24), and a first vacuum circuit breaker (6). Connection point 1 of the first signal light (23) is electrically connected to the positive terminal of the DC control bus via a wire, and connection point 2 of the first signal light (23) is electrically connected to connection point 8 of the first vacuum circuit breaker (6) via a wire. Connection point 1 of the second signal light (24) is electrically connected to the positive terminal of the DC control bus via a wire, and connection point 2 of the second signal light (24) is electrically connected to connection point 3 of the first vacuum circuit breaker (6) via a wire. Connection point B15 in the microcomputer protection device (8) is electrically connected to connection point 31 in the first vacuum circuit breaker (6) through a wire. Connection point C02 in the microcomputer protection device (8) is electrically connected to connection point 8 in the first vacuum circuit breaker (6) through a wire. Connection point C01 in the microcomputer protection device (8) is electrically connected to connection point 3 in the first vacuum circuit breaker (6) through a wire. Connection points 13, 18 and 30 in the first vacuum circuit breaker (6) are electrically connected to the negative terminal of the DC control bus through wires.

4. A safety anti-misoperation circuit for a high-voltage switchgear according to claim 1 or 2, characterized in that: It also includes an electromagnetic lock (7) and a live display (9). Connection points L and K1 in the live display (9) are electrically connected to the positive terminal of the DC control bus through wires. Connection point N in the live display (9) is electrically connected to the negative terminal of the DC control bus through wires. Connection point K2 in the live display (9) is electrically connected to connection point S1 in the electromagnetic lock (7) through wires, and connection point S2 in the electromagnetic lock (7) is electrically connected to the negative terminal of the DC control bus through wires.

5. The safety anti-misoperation circuit for a high-voltage switchgear according to claim 1, characterized in that: A first circuit breaker (16) is provided at the positive terminal of the DC control bus, and a second circuit breaker (1) is provided at the negative terminal of the DC control bus.

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