A safety operation circuit for an energy storage box transformer and its control method

Abstract

The present invention discloses a safety operation circuit for an energy storage box transformer and its control method, which includes an A-phase outgoing line terminal and an N-phase outgoing line terminal. The A-phase outgoing line terminal is electrically connected to one end of a phase change operation device, and the N-phase outgoing line terminal is electrically connected to the other end of the phase change operation device. The phase change operation device includes a control circuit, a malfunction trip logic circuit, and a malfunction closing logic circuit. The present invention has the function of controlling the safety operation procedure of the switch; it is safer and more reliable in case of mis-tripping and mis-closing.

Description

Technical Field

[0001] The present invention relates to the field of electricity, and particularly to a safety operation circuit for an energy storage box transformer and a control method therefor. Background Art

[0002] Currently, for the power transmission operation of the box transformer in the power grid, on-site operators perform the power transmission and power cut-off operations of the box transformer according to the operation requirements in the operation ticket for the power cut-off and power transmission operations of the box transformer or the product operation manual. When the disconnector is in the open position, the circuit breaker cannot be closed to prevent closing the disconnector with load. Only when the earthing switch is in the open position can the circuit breaker be closed. This realizes preventing the accidental closing of the earthing switch with live voltage. During the operation process, manual operations are required, and manual confirmation is needed before and after each step of the operation to ensure the safety of personnel and equipment.

[0003] Currently, the power transmission operation procedure of the box transformer is complex. Generally, two people are required in the operation room, one for operation and one for supervision. It is easy to have misoperations, resulting in relatively large potential safety hazards. Summary of the Invention

[0004] To solve the above technical problems, the present invention proposes a safety operation circuit for an energy storage box transformer and a control method therefor.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A safety operation circuit for an energy storage box transformer includes a phase A outgoing line terminal L and a phase N outgoing line terminal N. The phase A outgoing line terminal L is electrically connected to one end of a phase change operation device WF, and the phase N outgoing line terminal N is electrically connected to the other end of the phase change operation device WF. The phase change operation device WF includes a control circuit, a misoperation tripping logic circuit, and a misoperation closing logic circuit.

[0007] The control circuit includes a power supply unit WF1, a closing 1 unit WF2, a closing 2 unit WF3, a closing 3 unit WF4, a tripping 1 unit WF19, a tripping 2 unit WF20, and a tripping 3 unit WF21, where one end of the power supply unit WF1 is electrically connected to the phase A outgoing line terminal L.

[0008] The other end of the power supply unit WF1 is electrically connected to one end of a second switch 2.

[0009] The other end of the closing 1 unit WF2 is sequentially electrically connected to a first push-button switch 1SB, a closing unit 1QF2 of a first vacuum circuit breaker 1QF, and one end of the second switch 2. The other end of the closing 2 unit WF3 is sequentially electrically connected to a second push-button switch 2SB, a closing unit 3QF2 of a third vacuum circuit breaker 3QF, and one end of the second switch 2. The other end of the closing 3 unit WF4 is sequentially electrically connected to a third push-button switch 3SB, a closing unit 4QF2 of a fourth vacuum circuit breaker 4QF, and one end of the second switch 2.

[0010] The other end of the trip 1 unit WF19 is electrically connected in sequence to the fourteenth push-button switch 14SB, the trip unit 1QF3 of the first vacuum circuit breaker 1QF, and one end of the second switch 2;

[0011] The other end of the trip 2 unit WF20 is electrically connected in sequence to the fifteenth push-button switch 15SB, the trip unit 3QF3 of the third vacuum circuit breaker 3QF, and one end of the second switch 2; the other end of the trip 3 unit WF21 is electrically connected in sequence to the sixteenth push-button switch 16SB, the trip unit 4QF3 of the fourth vacuum circuit breaker 4QF, and one end of the second switch 2; the second switch 2 is electrically connected to the N-phase outgoing terminal N.

[0012] For further improvement, the malfunction trip logic circuit includes a feedback 1 unit WF10, a feedback 2 unit WF11, a feedback 3 unit WF12, a feedback 4 unit WF13, and a feedback 5 unit WF14; the feedback 1 unit WF10 is electrically connected in sequence to the isolator non-isolated position feedback unit 1QS3 of the first isolator 1QS and the non-grounded position feedback unit 1QD3 of the first earthing switch 1QD to form a loop; the feedback 2 unit WF11 is electrically connected in sequence to the isolator isolated position feedback unit 3QS2 of the third isolator 3QS, the earthing switch grounded position feedback unit 3QD2 of the third earthing switch 3QD, the trip position unit 2QF5 of the second vacuum circuit breaker 2QF, and the closing position unit 1QF4 of the first vacuum circuit breaker 1QF to form a loop; the feedback 3 unit WF12 is electrically connected in sequence to the isolator isolated position feedback unit 4QS2 of the fourth isolator 4QS and the closing position unit 3QF4 of the third vacuum circuit breaker 3QF; the feedback 4 unit WF13 is electrically connected to the closing position unit of the fourth circuit breaker 4QF to form a loop; the feedback 5 unit WF14 is electrically connected to the closing position unit of the fifth circuit breaker 5QF to form a loop; the trip unit 5QF3 of the fifth circuit breaker 5QF is electrically connected in sequence to the closing 4 unit WF5 and the fourth push-button switch 4SB to form a loop; the trip unit 6QF3 of the sixth circuit breaker 6QF is electrically connected in sequence to the closing 5 unit WF6 and the fifth push-button switch 5SB to form a loop; the trip unit 7QF3 of the seventh circuit breaker 7QF is electrically connected in sequence to the closing 6 unit WF7 and the sixth push-button switch 6SB to form a loop; the trip unit 8QF3 of the eighth circuit breaker 8QF is electrically connected in sequence to the closing 7 unit WF8 and the seventh push-button switch 7SB to form a loop; the trip unit 9QF3 of the ninth circuit breaker 9QF is electrically connected in sequence to the closing 8 unit WF9 and the eighth push-button switch 8SB to form a loop.

[0013] For further improvement, the malfunction closing logic circuit includes a feedback 6 unit WF15, a feedback 7 unit WF16, a feedback 8 unit WF17, and a feedback 9 unit WF18;

[0014] The feedback 6 unit WF15 is electrically connected in sequence to the trip position unit 6QF5 of the sixth circuit breaker 6QF, the trip position unit 7QF5 of the seventh circuit breaker 7QF, the trip position unit 8QF5 of the eighth circuit breaker 8QF, and the trip position unit 9QF5 of the ninth circuit breaker 9QF to form a loop;

[0015] The feedback 7 unit WF16 is electrically connected in sequence to the fourth disconnecting switch 4QS and the closing position unit 5QF4 of the fifth circuit breaker 5QF to form a first loop; both ends of the feedback 7 unit WF16 are electrically connected to both ends of the normally closed point of the access control switch MK to form a second loop;

[0016] The feedback 8 unit WF17 is electrically connected in sequence to the disconnecting switch non-isolated position feedback unit 3QS3 of the third disconnecting switch 3QS, the earthing switch non-earthing position feedback unit of the third earthing switch 3QD, and the trip position unit 4QF5 of the fourth circuit breaker;

[0017] The feedback 9 unit WF18 is electrically connected in sequence to the disconnecting switch isolated position feedback unit 2QS2 of the second disconnecting switch 2QS, the earthing switch earthed position feedback unit 2QD2 of the second earthing switch 2QD, the trip position unit 2QF5 of the second vacuum circuit breaker 2QF, and the trip position unit 3QF5 of the third vacuum circuit breaker 3QF to form a loop; the closing unit 5QF2 of the fifth circuit breaker 5QF is electrically connected in sequence to the trip 4 unit WF22 and the ninth push button switch 9SB to form a loop; both ends of the closing unit 6QF2 of the sixth circuit breaker 6QF are electrically connected to both ends of the tenth push button switch 10SB to form a loop; both ends of the closing unit 7QF2 of the seventh circuit breaker 7QF are electrically connected to both ends of the eleventh push button switch 11SB to form a loop; both ends of the closing unit 8QF2 of the eighth circuit breaker 8QF are electrically connected to both ends of the twelfth push button switch 12SB to form a loop; both ends of the closing unit 9QF2 of the ninth circuit breaker 9QF are electrically connected to both ends of the thirteenth push button switch 13SB to form a loop.

[0018] Further improvements include the following steps:

[0019] The electrical operation process is as follows:

[0020] A1. Close the tenth push button switch 10SB, the eleventh push button switch 11SB, the twelfth push button switch 12SB, the thirteenth push button switch 13SB, the sixth circuit breaker 6QF, the seventh circuit breaker 7QF, the eighth circuit breaker Q8, and the ninth circuit breaker Q9 in sequence;

[0021] After the feedback unit WF15 of A2 receives all the closing signals of the sixth circuit breaker 6QF, the seventh circuit breaker 7QF, the eighth circuit breaker Q8, and the ninth circuit breaker Q9, it controls the tripping unit WF22 to change from normally open to closed; then press the ninth push-button switch 9SB electrically connected to the fifth circuit breaker 5QF to make the circuit conduct, and the closing unit 5QF2 of the fifth circuit breaker 5QF is energized to achieve closing;

[0022] After the feedback unit WF16 of A3 receives the non-isolation signal sent by the non-isolation position feedback unit 4QS3 of the fourth disconnector 4QS and the closing position signal sent by the closing position unit 5QF4 of the fifth circuit breaker 5QF, it sends a closing signal to the tripping unit WF21. The tripping unit WF21 controls to press the closing button 16SB, and the closing unit 4QF2 of the fourth vacuum circuit breaker 4QF conducts to make the fourth vacuum circuit breaker 4QF close;

[0023] After the feedback unit WF17 of A4 receives the tripping signal sent by the tripping unit 4QF5 of the fourth circuit breaker 4QF, that is, after the fourth circuit breaker 4QF closes, and the non-isolation position feedback unit 3QS3 of the third disconnector 3QS sends a signal indicating that the third disconnector 3QS is in a non-isolated state, and the non-grounding position feedback unit 3QD3 of the third earthing switch 3QD shows that the earthing switch is in a non-grounded state, it controls the third vacuum circuit breaker 3QF to close;

[0024] After the feedback unit WF18 of A5 receives the tripping signal sent by the tripping unit 3QF5 of the third vacuum circuit breaker 3QF, that is, after the third vacuum circuit breaker 3QF closes, and the non-isolation position feedback unit 1QS3 of the first disconnector 1QS sends a signal indicating that the first disconnector 1QS is in a non-isolated state, the tripping unit WF19 receives a closing signal and presses the fourteenth push-button switch 14SB to make the closing unit 1QF2 of the first vacuum circuit breaker 1QF energized for closing, and the first vacuum circuit breaker 1QF closes.

[0025] A further improvement includes the following steps: The tripping operation process is as follows:

[0026] After the feedback unit WF10 of B1 receives the tripping signal, it controls the closing unit 1QF2 of the first vacuum circuit breaker 1QF to change from normally open to normally closed. When pressing the first push-button switch 1SB, the circuit conducts, and the tripping unit 1QF3 of the first vacuum circuit breaker 1QF is energized, and the first vacuum circuit breaker 1QF trips; the closing signal is the signal that the first disconnector 1QS changes from normally open to normally closed and the first earthing switch 1QD changes from normally open to normally closed;

[0027] B2. The second disconnector 2QS remains in the isolated state. The disconnector isolation position feedback unit 2QS2 sends a signal indicating that the second disconnector 2QS remains isolated. The second earthing switch 2QD remains in the earthed state. The earthing switch earthing position feedback unit 2QD2 sends an earthing signal, causing the second vacuum circuit breaker 2QF to remain in the open state.

[0028] B3. The third disconnector 3QS is in the non-isolated state and sends a non-isolated signal through the disconnector non-isolated position feedback unit 3QS3. The third earthing switch 3QD is in the non-earthed state and sends a non-earthed signal through the earthing switch non-earthed position feedback unit 3QD. The feedback 2 unit WF11 receives the non-isolated signal of the third disconnector 3QS and the non-earthed signal of the third earthing switch 3QD, and controls the trip unit 2QF5 of the second vacuum circuit breaker 2QF to send a closing signal. When the feedback 2 unit WF11 receives the closing signal of the second vacuum circuit breaker 2QF, it controls the closing 2 unit WF3 to change from normally open to closed. When the second push-button switch 2SB is pressed, the circuit is conducted, the trip unit 3QF3 of the third vacuum circuit breaker 3QF is energized, and the third vacuum circuit breaker 3QF trips.

[0029] B4. The disconnector non-isolated position feedback unit 4QS3 of the fourth disconnector 4QS sends a non-isolated signal. The feedback 3 unit WF12 receives the normally closed signal from the closing unit 3QF4 of the third vacuum circuit breaker 3QF and the non-isolated signal from the disconnector non-isolated position feedback unit 4QS3 of the fourth disconnector 4QS. The feedback 3 unit WF12 receives the closing signal. At this time, the closing 3 unit WF4 changes from normally open to closed. When the third push-button switch 3SB is pressed, the circuit is conducted, the trip unit 4QF3 of the fourth circuit breaker 4QF is energized, and the fourth circuit breaker 4QF trips.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. It has the function of controlling the safe operation procedure of the switch.

[0032] 2. It is safer and more reliable in case of misoperation of opening and closing. Description of the Drawings

[0033] The present invention will be further described with reference to the accompanying drawings, but the content in the drawings does not constitute any limitation to the present invention.

[0034] Figure 1 It is a schematic circuit diagram of the control circuit;

[0035] Figure 2 It is a schematic circuit diagram of the misoperation closing logic circuit;

[0036] Figure 3 It is a schematic circuit diagram of the misoperation tripping logic circuit;

[0037] Figure 4 Schematic diagram of the power consumption process of the present invention;

[0038] Figure 5 Schematic diagram of the tripping power outage process of the present invention;

[0039] Figure 6 Schematic diagram of the structure of the box transformer operating device;

[0040] Figure 7 Schematic diagram of the structure of the first vacuum circuit breaker;

[0041] Figure 8 Schematic diagram of the structure of the second vacuum circuit breaker;

[0042] Figure 9 Schematic diagram of the structure of the third vacuum circuit breaker;

[0043] Figure 10 Schematic diagram of the structure of the fourth circuit breaker;

[0044] Figure 11 Schematic diagram of the structure of the fifth circuit breaker;

[0045] Figure 12 Schematic diagram of the structure of the sixth circuit breaker;

[0046] Figure 13 Schematic diagram of the structure of the seventh circuit breaker;

[0047] Figure 14 Schematic diagram of the structure of the eighth circuit breaker;

[0048] Figure 15 Schematic diagram of the structure of the ninth circuit breaker;

[0049] Figure 16 Schematic diagram of the structure of the first earthing switch;

[0050] Figure 17 Schematic diagram of the structure of the second earthing switch;

[0051] Figure 18 Schematic diagram of the structure of the third earthing switch;

[0052] Figure 19 Schematic diagram of the structure of the fourth earthing switch;

[0053] Figure 20 Schematic diagram of the structure of the first isolating switch;

[0054] Figure 21 Schematic diagram of the structure of the second isolating switch;

[0055] Figure 22 Schematic diagram of the structure of the third isolating switch;

[0056] Figure 23 It is a structural schematic diagram of the fourth disconnecting switch. Specific implementation manners

[0057] In order to make the purpose, technical solutions and advantages of the invention more clear and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

[0058] Embodiment 1

[0059] Wherein, the tripping unit in the present invention is the tripping coil, and the closing unit is the closing coil; the closing position unit is the inductor that senses the closing state and sends the closing induction signal, such as a position sensor, a proximity sensor, etc.; the tripping position unit is the inductor that senses the tripping state and sends the tripping state signal, such as a position sensor, a proximity sensor, etc.; the "earthing switch earthing position feedback unit" is the inductor that senses the closing of the earthing switch and sends the closing earthing signal, such as a position sensor, a proximity sensor, etc.; the "earthing switch non-earthing position feedback unit" is the inductor that senses the tripping of the earthing switch and sends the tripping non-earthing signal, such as a position sensor, a proximity sensor, etc.; the disconnecting switch isolation position feedback unit is the inductor that senses the tripping of the disconnecting switch and sends the isolation signal, such as a position sensor, a proximity sensor, etc.; the disconnecting switch non-isolation position feedback unit is the inductor that senses the closing of the disconnecting switch and sends the non-isolation signal, such as a position sensor, a proximity sensor, etc.

[0060] Such as Figures 1 - 3 A kind of energy storage box substation safety operation circuit shown, including the A-phase outgoing line terminal L and the N-phase outgoing line terminal N. The A-phase outgoing line terminal L is electrically connected to one end of the phase change operation device WF, and the N-phase outgoing line terminal N is electrically connected to the other end of the phase change operation device WF; the phase change operation device WF includes a control circuit, a misoperation tripping logic circuit and a misoperation closing logic circuit;

[0061] The control circuit includes a power supply unit WF1, a closing 1 unit WF2, a closing 2 unit WF3, a closing 3 unit WF4, a tripping 1 unit WF19, a tripping 2 unit WF20 and a tripping 3 unit WF21, one end of which is electrically connected to the A-phase outgoing line terminal L;

[0062] The other end of the power supply unit WF1 is electrically connected to one end of the second switch 2;

[0063] The other end of the closing 1 unit WF2 is sequentially electrically connected to the first push-button switch 1SB, the closing unit 1QF2 of the first vacuum circuit breaker 1QF and one end of the second switch 2; the other end of the closing 2 unit WF3 is sequentially electrically connected to the second push-button switch 2SB, the closing unit 3QF2 of the third vacuum circuit breaker 3QF and one end of the second switch 2; the other end of the closing 3 unit WF4 is sequentially electrically connected to the third push-button switch 3SB, the closing unit 4QF2 of the fourth vacuum circuit breaker 4QF and one end of the second switch 2;

[0064] The other end of the trip 1 unit WF19 is electrically connected in sequence to the fourteenth pushbutton switch 14SB, the trip unit 1QF3 of the first vacuum circuit breaker 1QF, and one end of the second switch 2;

[0065] The other end of the trip 2 unit WF20 is electrically connected in sequence to the fifteenth pushbutton switch 15SB, the trip unit 3QF3 of the third vacuum circuit breaker 3QF, and one end of the second switch 2; the other end of the trip 3 unit WF21 is electrically connected in sequence to the sixteenth pushbutton switch 16SB, the trip unit 4QF3 of the fourth vacuum circuit breaker 4QF, and one end of the second switch 2; the second switch 2 is electrically connected to the N-phase outgoing line terminal N.

[0066] The malfunction trip logic circuit includes a feedback 1 unit WF10, a feedback 2 unit WF11, a feedback 3 unit WF12, a feedback 4 unit WF13, and a feedback 5 unit WF14; the feedback 1 unit WF10 is electrically connected in sequence to the disconnector non-isolated position feedback unit 1QS3 of the first disconnector 1QS and the non-grounding position feedback unit 1QD3 of the first earthing switch 1QD to form a loop; the feedback 2 unit WF11 is electrically connected in sequence to the disconnector isolated position feedback unit 3QS2 of the third disconnector 3QS, the earthing switch grounding position feedback unit 3QD2 of the third earthing switch 3QD, the trip position unit 2QF5 of the second vacuum circuit breaker 2QF, and the closing position unit 1QF4 of the first vacuum circuit breaker 1QF to form a loop; the feedback 3 unit WF12 is electrically connected in sequence to the disconnector isolated position feedback unit 4QS2 of the fourth disconnector 4QS and the closing position unit 3QF4 of the third vacuum circuit breaker 3QF; the feedback 4 unit WF13 is electrically connected to the closing position unit of the fourth circuit breaker 4QF to form a loop; the feedback 5 unit WF14 is electrically connected to the closing position unit of the fifth circuit breaker 5QF to form a loop; the trip unit 5QF3 of the fifth circuit breaker 5QF is electrically connected in sequence to the closing 4 unit WF5 and the fourth pushbutton switch 4SB to form a loop; the trip unit 6QF3 of the sixth circuit breaker 6QF is electrically connected in sequence to the closing 5 unit WF6 and the fifth pushbutton switch 5SB to form a loop; the trip unit 7QF3 of the seventh circuit breaker 7QF is electrically connected in sequence to the closing 6 unit WF7 and the sixth pushbutton switch 6SB to form a loop; the trip unit 8QF3 of the eighth circuit breaker 8QF is electrically connected in sequence to the closing 7 unit WF8 and the seventh pushbutton switch 7SB to form a loop; the trip unit 9QF3 of the ninth circuit breaker 9QF is electrically connected in sequence to the closing 8 unit WF9 and the eighth pushbutton switch 8SB to form a loop.

[0067] The malfunction closing logic circuit includes a feedback 6 unit WF15, a feedback 7 unit WF16, a feedback 8 unit WF17, and a feedback 9 unit WF18;

[0068] The feedback 6 unit WF15 is electrically connected in sequence to the trip position unit 6QF5 of the sixth circuit breaker 6QF, the trip position unit 7QF5 of the seventh circuit breaker 7QF, the trip position unit 8QF5 of the eighth circuit breaker 8QF, and the trip position unit 9QF5 of the ninth circuit breaker 9QF to form a loop;

[0069] The feedback 7 unit WF16 is electrically connected in sequence to the fourth disconnecting switch 4QS and the closing position unit 5QF4 of the fifth circuit breaker 5QF to form a first loop; both ends of the feedback 7 unit WF16 are electrically connected to both ends of the normally closed point of the access control switch MK to form a second loop;

[0070] The feedback 8 unit WF17 is electrically connected in sequence to the disconnector non-isolated position feedback unit 3QS3 of the third disconnector 3QS, the earthing switch non-earthing position feedback unit of the third earthing switch 3QD, and the trip position unit 4QF5 of the fourth circuit breaker;

[0071] The feedback 9 unit WF18 is electrically connected in sequence to the disconnector isolated position feedback unit 2QS2 of the second disconnector 2QS, the earthing switch earthed position feedback unit 2QD2 of the second earthing switch 2QD, the trip position unit 2QF5 of the second vacuum circuit breaker 2QF, and the trip position unit 3QF5 of the third vacuum circuit breaker 3QF to form a loop; the closing unit 5QF2 of the fifth circuit breaker 5QF is electrically connected in sequence to the trip 4 unit WF22 and the ninth push-button switch 9SB to form a loop; both ends of the closing unit 6QF2 of the sixth circuit breaker 6QF are electrically connected to both ends of the tenth push-button switch 10SB respectively to form a loop; both ends of the closing unit 7QF2 of the seventh circuit breaker 7QF are electrically connected to both ends of the eleventh push-button switch 11SB respectively to form a loop; both ends of the closing unit 8QF2 of the eighth circuit breaker 8QF are electrically connected to both ends of the twelfth push-button switch 12SB respectively to form a loop; both ends of the closing unit 9QF2 of the ninth circuit breaker 9QF are electrically connected to both ends of the thirteenth push-button switch 13SB respectively.

[0072] 1. Trip operation process

[0073] The 1QS in the incoming switch cabinet of the 1# ring main unit sends a non-isolated signal and a non-earthing state signal (normally closed signal) of 1QD. The feedback 1 unit WF10 of the box-type substation control device receives the disconnector isolation signal and the non-earthing state signal of the earthing switch (changed from normally open to normally closed). When WF10 receives the closing signal, WF2 will close from normally open. When pressing 1SB, the line is conducted, the trip coil of 1QF is energized, and 1QF trips.

[0074] 2QS remains open and 2QD is earthed.

[0075] 3QS sends a non-isolated signal (normally closed signal). 3QD changes from the grounded state to the ungrounded state. At WF11, it receives the non-isolated signal (normally closed signal) from the disconnector, the grounded state (normally closed signal) of 1QD, and the tripped position signal (normally closed signal) in 2QF. Only when WF11 receives all the above signals, WF3 will change from normally open to closed. When pressing 2SB, the circuit conducts and 3QF trips.

[0076] Put the disconnector 4QS in the low-voltage incoming line cabinet in the non-isolated state. At the substation control device WF12, it receives the closed position signal (normally closed signal) from the low-voltage incoming line circuit breaker 3QF and the working signal non-isolated state (normally closed signal) of the disconnector 4QS. Only when WF12 receives all the above signals, that is, receives the closing signal, WF4 will change from normally open to closed. When pressing the trip button 3SB, the circuit conducts, the trip coil of the circuit breaker 4QF is energized, and the circuit breaker 4QF trips.

[0077] After the substation control device WF13 receives the closed position signal, (normally closed signal) from the low-voltage incoming line circuit breaker 4QF, it controls the circuit breaker 5QF to trip.

[0078] After the substation control device WF14 receives the closed position signal (normally closed signal) from the low-voltage incoming line circuit breaker 5QF, it controls WF5 to change from normally open to closed. When pressing 4SB, the circuit conducts and the circuit breaker 5QF trips. WF6 changes from normally open to closed. When pressing SB5, the circuit conducts and 6QF trips. WF7 changes from normally open to closed. When pressing 6SB, the circuit conducts and 7QF trips. WF8 changes from normally open to closed. When pressing 7SB, the circuit conducts and 8QF trips. WF9 changes from normally open to closed. When pressing 8SB, the circuit conducts and 9QF trips.

[0079] 2. Closing operation process

[0080] After receiving the closing command, close 10 - 13SB and 6 - 9QF in sequence.

[0081] At the substation control device WF15, after receiving the closed position signals from 6 - 9QF, only when all the outgoing lines are closed can WF15 receive the closing signal. WF15 makes the normally open point of WF22 closed. Then press 9SB of 5QF to make 5QF2 energized and 5QF is closed.

[0082] At WF16, after receiving the closed position signal from 5QF, after the fuse circuit breaker 5QF is closed and 4QS is in the non-isolated state, WF21 receives the closing signal. Or, when the transformer room door is opened, the normally closed point of the access control point changes from normally open to normally closed, so that WF16 gets the closing signal and WF21 receives the closing signal. Press 16SB to make 4QF closed.

[0083] The tripping signal from 4QF is received at WF17. After 4QF is closed, and when 3QS is in the non-isolated state and 3QD is in the non-grounded state, WF20 receives the closing signal. Press 15SB to close 3QF.

[0084] The tripping signal from 3QF is received at WF18. After 3QF is closed, and when 1QS is in the non-isolated state and 1QD is in the non-grounded state, WF19 receives the closing signal. Press 14SB to close 1QF.

[0085] 3. Prevent mis-tripping and mis-closing

[0086] Since the disconnecting switch cannot be opened or closed under load, WF10 must receive the non-isolated state of 1QS and the non-grounded state of 1QD to enable the circuit breaker to trip and energize the line.

[0087] WF11 must receive the non-grounded state of 3QS and the non-grounded state of 3QD to enable the circuit breaker to trip and energize the line.

[0088] WF12 must receive the non-isolated state of 4QS to enable the circuit breaker to trip and energize the line. This avoids the disconnecting switch being opened under load when the outgoing line load has not been completely disconnected.

[0089] WF16 must receive the non-isolated state of 4QS to enable the circuit breaker to close and de-energize the line. This avoids the disconnecting switch being opened under load when the outgoing line load has not been completely disconnected.

[0090] At the substation transformer control device, WF17 must receive the non-isolated state of 3QS and the non-grounded state of 3QD to enable the circuit breaker to close and de-energize the line. This avoids the disconnecting switch being opened under load when the outgoing line load has not been completely disconnected.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A safety operation circuit for an energy storage box transformer, characterized in that, It includes the phase A outgoing terminal (L) and the phase N outgoing terminal (N). The phase A outgoing terminal (L) is electrically connected to one end of the phase change operation device (WF), and the phase N outgoing terminal (N) is electrically connected to the other end of the phase change operation device (WF); The phase change operation device (WF) includes a control circuit, a malfunction trip logic circuit, and a malfunction closing logic circuit; The control circuit includes a power supply unit (WF1), a closing 1 unit (WF2), a closing 2 unit (WF3), a closing 3 unit (WF4), a trip 1 unit (WF19), a trip 2 unit (WF20), and a trip 3 unit (WF21), where one end of the power supply unit (WF1) is electrically connected to the phase A outgoing terminal (L); The other end of the power supply unit (WF1) is electrically connected to one end of the second switch (2); The other end of the closing 1 unit (WF2) is sequentially electrically connected to the first push-button switch (1SB), the closing unit (1QF2) of the first vacuum circuit breaker (1QF), and one end of the second switch (2); The other end of the closing 2 unit (WF3) is sequentially electrically connected to the second push-button switch (2SB), the closing unit (3QF2) of the third vacuum circuit breaker (3QF), and one end of the second switch (2); The other end of the closing 3 unit (WF4) is sequentially electrically connected to the third push-button switch (3SB), the closing unit (4QF2) of the fourth vacuum circuit breaker (4QF), and one end of the second switch (2); The other end of the trip 1 unit (WF19) is sequentially electrically connected to the fourteenth push-button switch (14SB), the trip unit (1QF3) of the first vacuum circuit breaker (1QF), and one end of the second switch (2); The other end of the trip 2 unit (WF20) is sequentially electrically connected to the fifteenth push-button switch (15SB), the trip unit (3QF3) of the third vacuum circuit breaker (3QF), and one end of the second switch (2); The other end of the trip 3 unit (WF21) is sequentially electrically connected to the sixteenth push-button switch (16SB), the trip unit (4QF3) of the fourth vacuum circuit breaker (4QF), and one end of the second switch (2); The other end of the second switch (2) is electrically connected to the phase N outgoing terminal (N); The maloperation tripping logic circuit includes a feedback 1 unit (WF10), a feedback 2 unit (WF11), a feedback 3 unit (WF12), a feedback 4 unit (WF13), and a feedback 5 unit (WF14); the feedback 1 unit (WF10) is electrically connected in sequence to the disconnector non-isolated position feedback unit (1QS3) of the first disconnector (1QS) and the non-grounded position feedback unit (1QD3) of the first earthing switch (1QD) to form a loop; the feedback 2 unit (WF11) is electrically connected in sequence to the disconnector isolated position feedback unit (3QS2) of the third disconnector (3QS), the earthing switch grounded position feedback unit (3QD2) of the third earthing switch (3QD), the tripped position unit (2QF5) of the second vacuum circuit breaker (2QF), and the closed position unit (1QF4) of the first vacuum circuit breaker (1QF) to form a loop; the feedback 3 unit (WF12) is electrically connected in sequence to the disconnector isolated position feedback unit (4QS2) of the fourth disconnector (4QS) and the closed position unit (3QF4) of the third vacuum circuit breaker (3QF) to form a subsequent loop; the feedback 4 unit (WF13) is electrically connected to the closed position unit of the fourth circuit breaker (4QF) to form a loop; the feedback 5 unit (WF14) is electrically connected to the closed position unit of the fifth circuit breaker (5QF) to form a loop; the tripping unit (5QF3) of the fifth circuit breaker (5QF) is electrically connected in sequence to the closing 4 unit (WF5) and the fourth pushbutton switch (4SB) to form a loop; the tripping unit (6QF3) of the sixth circuit breaker (6QF) is electrically connected in sequence to the closing 5 unit (WF6) and the fifth pushbutton switch (5SB) to form a loop; the tripping unit (7QF3) of the seventh circuit breaker (7QF) is electrically connected in sequence to the closing 6 unit (WF7) and the sixth pushbutton switch (6SB) to form a loop; the tripping unit (8QF3) of the eighth circuit breaker (8QF) is electrically connected in sequence to the closing 7 unit (WF8) and the seventh pushbutton switch (7SB) to form a loop; the tripping unit (9QF3) of the ninth circuit breaker (9QF) is electrically connected in sequence to the closing 8 unit (WF9) and the eighth pushbutton switch (8SB) to form a loop; The maloperation closing logic circuit includes a feedback 6 unit (WF15), a feedback 7 unit (WF16), a feedback 8 unit (WF17), and a feedback 9 unit (WF18); The feedback 6 unit (WF15) is electrically connected in sequence to the tripped position unit (6QF5) of the sixth circuit breaker (6QF), the tripped position unit (7QF5) of the seventh circuit breaker (7QF), the tripped position unit (8QF5) of the eighth circuit breaker (8QF), and the tripped position unit (9QF5) of the ninth circuit breaker (9QF) to form a loop; The feedback 7 unit (WF16) is electrically connected in sequence to the fourth disconnector (4QS) and the closed position unit (5QF4) of the fifth circuit breaker (5QF) to form a first loop; both ends of the feedback 7 unit (WF16) are electrically connected to both ends of the normally closed point of the access control switch (MK) to form a second loop; The feedback 8 unit (WF17) is electrically connected in sequence to the disconnector non-isolated position feedback unit (3QS3) of the third disconnector (3QS), the earthing switch non-earthing position feedback unit of the third earthing switch (3QD), and the tripping position unit (4QF5) of the fourth circuit breaker. The feedback 9 unit (WF18) is electrically connected in sequence to the disconnector isolated position feedback unit (2QS2) of the second disconnector (2QS), the earthing switch earthed position feedback unit (2QD2) of the second earthing switch (2QD), the tripping position unit (2QF5) of the second vacuum circuit breaker (2QF), and the tripping position unit (3QF5) of the third vacuum circuit breaker (3QF) to form a loop; The closing unit (5QF2) of the fifth circuit breaker (5QF) is electrically connected in sequence to the tripping 4 unit (WF22) and the ninth pushbutton switch (9SB) to form a loop; The two ends of the closing unit (6QF2) of the sixth circuit breaker (6QF) are electrically connected to the two ends of the tenth pushbutton switch (10SB) respectively to form a loop; The two ends of the closing unit (7QF2) of the seventh circuit breaker (7QF) are electrically connected to the two ends of the eleventh pushbutton switch (11SB) respectively; The two ends of the closing unit (8QF2) of the eighth circuit breaker (8QF) are electrically connected to the two ends of the twelfth pushbutton switch (12SB) respectively; The two ends of the closing unit (9QF2) of the ninth circuit breaker (9QF) are electrically connected to the two ends of the thirteenth pushbutton switch (13SB) respectively. During the tripping operation process: The feedback 1 unit (WF10) to the feedback 3 unit (WF12) respectively control the normally open contacts of the closing 1 unit (WF2) to the closing 3 unit (WF4) to close. After the feedback 4 unit (WF13) receives the closing signal from the fourth vacuum circuit breaker (4QF), it controls the fifth circuit breaker (5QF) to trip. After the feedback 5 unit (WF14) receives the closing signal from the fifth circuit breaker (5QF), it controls the closing 4 unit (WF5), the closing 5 unit (WF6), the closing 6 unit (WF7), the closing 7 unit (WF8), and the closing 8 unit (WF9) to change from normally open to closed. During the power consumption operation process: The feedback 6 unit (WF15) to the feedback 9 unit (WF18) respectively control the tripping 4 unit (WF22) to the tripping 1 unit (WF19) to change from normally open to closed.

2. The control method of the energy storage box transformer safety operation circuit as shown in claim 1, characterized in that, It includes the following steps: The power consumption operation process is as follows: A1. Close the tenth pushbutton switch (10SB), the eleventh pushbutton switch (11SB), the twelfth pushbutton switch (12SB), the thirteenth pushbutton switch (13SB), the sixth circuit breaker (6QF), the seventh circuit breaker (7QF), the eighth circuit breaker (8QF), and the ninth circuit breaker (9QF) in sequence. After the feedback 6 unit (WF15) receives the full closing signals of the sixth circuit breaker (6QF), the seventh circuit breaker (7QF), the eighth circuit breaker (8QF), and the ninth circuit breaker (9QF), it controls the tripping 4 unit (WF22) to change from normally open to closed; then pressing the ninth pushbutton switch (9SB) electrically connected to the fifth circuit breaker (5QF) makes the circuit conduct, and the closing unit (5QF2) of the fifth circuit breaker (5QF) is energized to achieve closing; A3. After the feedback 7 unit (WF16) receives the non-isolation signal sent by the non-isolation position feedback unit (4QS3) of the fourth disconnecting switch (4QS) and the closing position signal sent by the closing position unit (5QF4) of the fifth circuit breaker (5QF), it sends a closing signal to the tripping 3 unit (WF21). The tripping 3 unit (WF21) controls to press the closing button (16SB), and the closing unit (4QF2) of the fourth vacuum circuit breaker (4QF) conducts to make the fourth vacuum circuit breaker (4QF) close; A4. After the feedback 8 unit (WF17) receives the tripping signal sent by the tripping position unit (4QF5) of the fourth circuit breaker (4QF), that is, after the fourth circuit breaker (4QF) closes, and the non-isolation position feedback unit (3QS3) of the third disconnecting switch (3QS) sends a signal indicating that the third disconnecting switch (3QS) is in a non-isolated state, and the non-grounding position feedback unit (3QD3) of the third earthing switch (3QD) shows that the earthing switch is in a non-grounded state, it controls the third vacuum circuit breaker (3QF) to close; A5. After the feedback 9 unit (WF18) receives the tripping signal sent by the tripping position unit (3QF5) of the third vacuum circuit breaker (3QF), that is, after the third vacuum circuit breaker (3QF) closes, and the non-isolation position feedback unit (1QS3) of the first disconnecting switch (1QS) sends a signal indicating that the first disconnecting switch (1QS) is in a non-isolated state, the tripping 1 unit (WF19) receives the closing signal and presses the fourteenth pushbutton switch (14SB) to make the closing unit (1QF2) of the first vacuum circuit breaker (1QF) energized for closing, and the first vacuum circuit breaker (1QF) closes.

3. The control method of the energy storage box transformer safety operation circuit as claimed in claim 1, wherein The tripping operation process is as follows: B1. After the feedback 1 unit (WF10) receives the tripping signal, it controls the closing unit (1QF2) of the first vacuum circuit breaker (1QF) to change from normally open to normally closed. When pressing the first pushbutton switch (1SB), the circuit conducts, and the tripping unit (1QF3) of the first vacuum circuit breaker (1QF) is energized, and the first vacuum circuit breaker (1QF) trips; the closing signal is the signal that the first disconnecting switch (1QS) changes from normally open to normally closed and the first earthing switch (1QD) changes from normally open to normally closed; B2. The second disconnecting switch (2QS) remains in the isolated state. The disconnecting switch isolation position feedback unit (2QS2) sends a signal indicating that the second disconnecting switch (2QS) remains isolated. The second earthing switch (2QD) remains in the earthed state. The earthing switch earthing position feedback unit (2QD2) sends an earthing signal, causing the second vacuum circuit breaker (2QF) to remain in the open state. B3. The third disconnecting switch (3QS) is in the non-isolated state and sends a non-isolated signal through the disconnecting switch non-isolated position feedback unit (3QS3). The third earthing switch (3QD) is in the non-earthed state and sends a non-earthed signal through the earthing switch non-earthed position feedback unit (3QD). The feedback 2 unit (WF11) receives the non-isolated signal of the third disconnecting switch (3QS) and the non-earthed signal of the third earthing switch (3QD), and controls the trip unit (2QF5) of the second vacuum circuit breaker (2QF) to send a closing signal. When the feedback 2 unit (WF11) receives the closing signal of the second vacuum circuit breaker (2QF), it controls the closing 2 unit (WF3) to close from the normally open state. When the second pushbutton switch (2SB) is pressed, the circuit is conducted, the trip unit (3QF3) of the third vacuum circuit breaker (3QF) is energized, and the third vacuum circuit breaker (3QF) trips. B4. The disconnecting switch non-isolated position feedback unit (4QS3) of the fourth disconnecting switch (4QS) sends a non-isolated signal. The feedback 3 unit (WF12) receives the normally closed signal from the closing unit (3QF4) of the third vacuum circuit breaker (3QF). The disconnecting switch non-isolated position feedback unit (4QS3) of the fourth disconnecting switch (4QS) sends a non-isolated signal. The feedback 3 unit (WF12) receives the closing signal. At this time, the closing 3 unit (WF4) closes from the normally open state. When the third pushbutton switch (3SB) is pressed, the circuit is conducted, the trip unit (4QF3) of the fourth circuit breaker (4QF) is energized, and the fourth circuit breaker (4QF) trips.

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