Anti-misoperation protection device for electrical control cabinet

Abstract

The utility model relates to an anti-misoperation protection device for an electrical control cabinet, which comprises an electrical control cabinet and a circuit breaker, the circuit breaker is used for supplying power to the electrical control cabinet, the anti-misoperation protection device further comprises a microswitch, a support frame, an indication board and a control loop, the support frame is fixed on the front surface of a cabinet door of the electrical control cabinet, and the microswitch is arranged behind the cabinet door of the electrical control cabinet. The indication board is connected with the supporting frame in an inserted mode, when the indication board is inserted into the supporting frame, the microswitch acts, and the microswitch is connected with the control loop. The electric control cabinet has the advantages that when equipment controlled by the electric control cabinet stops running or is overhauled, the indication board of'manual operation and closing prohibition 'is inserted into the supporting frame of the cabinet door of the electric control cabinet, and the microswitch is connected with a control loop and acts, so that the closing operation loop of the electric control cabinet is cut off through the microswitch, and the closing operation of the electric control cabinet is stopped. Local or remote closing operation cannot enable the closing coil Y9 of the circuit breaker to form a closed loop, so that the electrical control cabinet is in a non-closing state, and the safety of equipment or equipment maintenance operation is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electric control equipment, in particular to a protection device for preventing misoperation of an electric control cabinet. Background Art

[0002] When the electrical control cabinet is in shutdown or maintenance state due to a fault, a safety sign "Someone is working, do not close the switch" will be hung on the panel of the electrical control cabinet to prevent personal and equipment safety accidents caused by misoperation. If the "Someone is working, do not close the switch" safety sign falls off for some reason and fails to warn the operating status of the electrical control cabinet, the operator may neglect to confirm and make a mistake when closing the electrical control cabinet locally or remotely, causing the electrical equipment controlled by the electrical control cabinet that was in the open state due to the fault to be powered on again, causing the electrical equipment fault to expand or be damaged; causing the electrical control cabinet that should have been in the open state due to maintenance to be powered on again, endangering the life safety of the maintenance personnel. Summary of the invention

[0003] The utility model aims to provide a protection device for preventing misoperation of an electrical control cabinet, which solves the problem of closing and energizing the electrical control cabinet in a fault shutdown or maintenance state due to local or remote misoperation by the operator, thereby protecting personal and equipment safety.

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] A protection device for preventing misoperation of an electrical control cabinet comprises an electrical control cabinet and a circuit breaker, and also comprises a micro switch, a support frame, an indicator sign, and a control circuit. The support frame is fixed on the front of a cabinet door of the electrical control cabinet, the micro switch is arranged behind the cabinet door of the electrical control cabinet, the indicator sign is plugged into the support frame, the micro switch is actuated when the indicator sign is inserted into the support frame, and the micro switch and the circuit breaker are connected to the control circuit.

[0006] It also includes an operation box and an operation table, and the control circuit is connected to the operation box and the operation table; the control circuit includes a closing circuit and an opening circuit, the closing circuit includes a closing branch a, a closing branch b, and a closing branch c, the output ends of the closing branch a and the closing branch b are both connected to the closing input port of the comprehensive protection device, the input end of the closing branch c is connected to the closing output port of the comprehensive protection device, the opening circuit includes an opening branch a and a opening branch b, the output end of the opening branch a is connected to the opening input port of the comprehensive protection device, the input end of the opening branch b is connected to the opening output port of the comprehensive protection device, the input ends of the closing branch a, the closing branch b, and the opening branch a are connected to the positive pole of the DC power supply, and the output ends of the closing branch c and the opening branch b are connected to the negative pole of the DC power supply.

[0007] The closing branch a includes the normally open contact 1 of the transfer switch SA1, the normally open contact 1 of the transfer switch SA2, and the normally closed contact of the circuit breaker test position SB connected in series; the closing branch b includes the normally open contact 2 of the transfer switch SA1, the normally open contact 1 of the transfer switch SAE, the normally open contact 1 of the transfer switch SAT, and the normally open auxiliary contact S9 of the circuit breaker connected in series; the normally open contact 1 of the transfer switch SAX is connected in parallel with the normally open contact 1 of the transfer switch SAT; the normally open contact 2 of the transfer switch SAE is connected in series with the normally open contact 1 of the transfer switch SAX; the closing branch c includes the normally open auxiliary contact S3 of the circuit breaker, the normally closed auxiliary contact S1 of the circuit breaker, the closing coil Y9 of the circuit breaker, the normally open contact S1.0 of the circuit breaker working position, and the normally closed contact of the micro switch connected in series;

[0008] The transfer switches SA1, SA2 and SAE are arranged on the electrical control cabinet, the transfer switch SAT is arranged on the operating table and the transfer switch SAX is arranged on the operating box.

[0009] The opening branch a includes the normally open contact 2 of the transfer switch SA2, the normally open contact 2 of the transfer switch SAT, and the normally open contact 2 of the transfer switch SAX connected in parallel, and the opening branch b includes the opening coil of the circuit breaker.

[0010] The control circuit also includes an indication circuit, which includes a closing indication circuit and an opening indication circuit connected in parallel. The closing indication circuit includes the normally open auxiliary contacts of the circuit breakers connected in series and the indicator light HLH1, and the indicator light HLH is connected in parallel with the indicator light HLH1. The opening indication circuit includes the normally closed auxiliary contacts of the circuit breakers connected in series and the indicator light HLF1, and the indicator light HLF is connected in parallel with the indicator light HLF1. The indicator lights HLH1 and HLF1 are arranged on the operating box, and the indicator lights HLH and HLF are arranged on the operating table.

[0011] The model of the comprehensive protection device is PCS-9626.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] When the equipment controlled by the electrical control cabinet is shut down or under maintenance, the "Someone is working, do not close the switch" sign is inserted into the support frame of the electrical control cabinet door. Since the microswitch is connected to the control circuit, the microswitch is actuated to cut off the closing operation circuit of the electrical control cabinet through the microswitch. Neither local nor remote closing operations can form a closed circuit for the circuit breaker closing coil Y9, so that the electrical control cabinet is in a state where it cannot be closed, ensuring the safety of the equipment and equipment maintenance operations. It has a simple structure, convenient operation, low transformation cost, and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is a schematic diagram of the installation of the micro switch on the door of the electrical control cabinet.

[0015] Figure 2 It is a schematic diagram of the principle of the protection device for preventing misoperation of the electrical control cabinet.

[0016] In the figure: 1-support frame 2-micro switch 3-cabinet door. DETAILED DESCRIPTION

[0017] The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0018] The following examples are implemented based on the technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0019] [Example 1]

[0020] See Figure 1 , Figure 2 A protection device for preventing misoperation of an electrical control cabinet comprises an electrical control cabinet, a circuit breaker, an operation box, an operation table, a micro switch 2, a support frame 1, an indicator board, and a control circuit. The circuit breaker is a power supply mechanism of the electrical control cabinet. The support frame 1 is fixed on the front of a cabinet door 3 of the electrical control cabinet. The micro switch 2 is arranged behind the cabinet door 3 of the electrical control cabinet. The indicator board is plugged into the support frame 1. When the equipment controlled by the electrical control cabinet is shut down or overhauled, the indicator board is inserted into the support frame 1. The indicator board presses the micro switch 2. The contact swing arm of the micro switch 2 drives the contact to move, which is used to cut off the closing circuit of the circuit breaker. Neither local nor remote closing operation can make the closing coil Y9 of the circuit breaker form a closed circuit, so that the electrical control cabinet is in a state where it cannot be closed. The indicator board is a safety indicator board of "someone is working, closing is prohibited". The control circuit includes a closing circuit, an opening circuit, and an indication circuit. The closing circuit includes a closing branch a, a closing branch b, and a closing branch c. The output ends of the closing branch a and the closing branch b are both connected to the closing input port 10 of the comprehensive protection device, and the input end of the closing branch c is connected to the closing output port 16 of the comprehensive protection device. The opening circuit includes an opening branch a and an opening branch b. The output end of the opening branch a is connected to the opening input port 11 of the comprehensive protection device, and the input end of the opening branch b is connected to the opening output ports 16 and 17 of the comprehensive protection device. The input ends of the closing branch a, the closing branch b, and the opening branch a are connected to the positive pole +1WC of the DC power supply, and the output ends of the closing branch c and the opening branch b are connected to the negative pole -1WC of the DC power supply; the model of the integrated protection device is PCS-9626.

[0021] The closing branch a includes the normally open contact 1 of the series-connected transfer switch SA1, the normally open contact 1 of the transfer switch SA2, and the normally closed contact of the circuit breaker test position SB. The normally open contact 1 of the transfer switch SA1 is used for local operation selection, and the normally open contact 1 of the transfer switch SA2 is used for the closing operation of the electrical control cabinet. The closing branch b includes the normally open contact 2 of the series-connected transfer switch SA1, the normally open contact 1 of the transfer switch SAE, the normally open contact 1 of the transfer switch SAT, and the normally open auxiliary contact S9 of the circuit breaker. The normally open contact 2 of the transfer switch SA1 is used for remote operation selection, and the remote operation selection includes operation on the operating table and operation in the operation box. The normally open contact 1 of the transfer switch SAE is used for operation on the operating table, and the normally open contact 1 of the transfer switch SAT is used for closing operation on the operating table. Operation, the normally open contact 1 of the transfer switch SAX is connected in parallel with the normally open contact 1 of the transfer switch SAT, the normally open contact 1 of the transfer switch SAX is used for the closing operation of the operation box, the normally open contact 2 of the transfer switch SAE is connected in series with the normally open contact 1 of the transfer switch SAX, the normally open contact 2 of the transfer switch SAE is used for the operation selection of the operation box, the closing branch c includes the normally open auxiliary contact S3 of the circuit breaker connected in series, the normally closed auxiliary contact S1 of the circuit breaker, the closing coil Y9 of the circuit breaker, the normally open contact S1.0 of the circuit breaker working position, and the normally closed contact AQBH of the micro switch 2; the transfer switch SA1, the transfer switch SA2, and the transfer switch SAE are arranged on the electrical control cabinet, the transfer switch SAT is arranged on the operating table, and the transfer switch SAX is arranged on the operation box.

[0022] The opening branch a includes the normally open contact 2 of the transfer switch SA2, the normally open contact 2 of the transfer switch SAT, and the normally open contact 2 of the transfer switch SAX connected in parallel. The opening branch b includes the opening coil of the circuit breaker. The normally open contact 2 of the transfer switch SA2 is used for the opening operation of the control box, the normally open contact 2 of the transfer switch SAT is used for the opening operation of the operating table, and the normally open contact 2 of the transfer switch SAX is used for the opening operation of the operating box. The indication circuit includes a closing indication circuit and an opening indication circuit connected in parallel. The closing indication circuit includes the normally open auxiliary contacts of the circuit breakers connected in series and the indicator light HLH1. The indicator light HLH is connected in parallel with the indicator light HLH1. The opening indication circuit includes the normally closed auxiliary contacts of the circuit breakers connected in series and the indicator light HLF1. The indicator light HLF is connected in parallel with the indicator light HLF1. The indicator lights HLH1 and HLF1 are arranged on the operating box, and the indicator lights HLH and HLF are arranged on the operating table.

[0023] Working process:

[0024] When the circuit breaker is in the tripping position, the auxiliary point S1 of the circuit breaker is normally closed, TWJ is energized, and the circuit breaker is displayed as open; when the circuit breaker is in the closing position, the auxiliary point S1 of the circuit breaker is normally open, HWJ is energized, and the circuit breaker is displayed as open.

[0025] The circuit breaker is closed in the test position:

[0026] ①The conversion switch SA1 is selected in the local position.

[0027] ②The transfer switch SA2 is in the closed position.

[0028] ③The normally closed point of the circuit breaker test position S8 is in the closed position, and the normally open point of the circuit breaker auxiliary point S3 is in the closed position.

[0029] ④ When the control power supply + passes through the unidirectional diode D1 and the "Someone is working, do not close the switch" safety sign is not inserted into the support frame, the normally closed contact of the micro switch is closed, the circuit breaker closing coil Y9 is energized, the circuit breaker is closed, and the equipment connected to the circuit breaker outlet is energized and operated.

[0030] ⑤ When the equipment is shut down or under maintenance, the safety sign "Someone is working, do not close the switch" is inserted into the support frame, the normally closed contacts of the micro switch are disconnected, and the circuit breaker closing coil Y9 cannot be energized. Therefore, the circuit breaker cannot be closed, and the equipment at the circuit breaker outlet cannot be powered and operated, thereby protecting the safety of the maintenance personnel and the equipment that needs to be shut down or under maintenance.

[0031] The circuit breaker is closed in the working position:

[0032] ①The conversion switch SA1 is selected in the local position.

[0033] ②The transfer switch SA2 is in the closed position.

[0034] ③ The normally closed point of the circuit breaker test position S8 is disconnected, the normally open point of the circuit breaker auxiliary point S9 is in the closed position, and the normally open point of the circuit breaker auxiliary point S3 is in the closed position.

[0035] ④ Short-circuit the short-circuit chain plate S9LP.

[0036] ⑤ When the control power supply + passes through the unidirectional diode D2 and the "Someone is working, do not close the switch" safety sign is not inserted into the support frame, the normally closed contact of the micro switch is closed, the circuit breaker closing coil Y9 is energized, the circuit breaker is closed, and the equipment connected to the circuit breaker outlet is energized and operated.

[0037] ⑥ When the equipment is shut down or under maintenance, the safety sign "Someone is working, do not close the switch" is inserted into the support frame, the normally closed contacts of the micro switch are disconnected, and the circuit breaker closing coil Y9 cannot be energized. Therefore, the circuit breaker cannot be closed, and the equipment at the circuit breaker outlet cannot be powered and operated, thereby protecting the safety of the maintenance personnel and the equipment that needs to be shut down or under maintenance.

[0038] Similarly, when the "Someone is working, do not close the circuit breaker" safety sign is not inserted into the supporting frame, when the conversion switch SA1 is selected in the remote position, the circuit breaker can also be closed in the experimental position and the working position; when the equipment is shut down or overhauled, the "Someone is working, do not close the circuit breaker" safety sign is inserted into the supporting frame, the normally closed contacts of the microswitch are disconnected, and the circuit breaker closing coil Y9 cannot be energized. Even if the conversion switch SA1 is selected in the remote position, the circuit breaker cannot be closed in the experimental position and the working position, and the equipment at the circuit breaker outlet end cannot be powered and operated, thereby protecting the safety of the maintenance personnel and the equipment that needs to be shut down or overhauled.

[0039] The circuit breaker opening operation is not restricted by location:

[0040] ①The transfer switch SA2 is set to the open position.

[0041] ②Control power supply + through a unidirectional diode.

[0042] ③The circuit breaker auxiliary point S1 is normally open in the closed position.

[0043] ④ The circuit breaker opening coil Y1 is energized and the circuit breaker opens.

[0044] Similarly, remote and local opening operations can be achieved through the opening switches of the operation box and operation table and the opening switches of the control cabinet.

[0045] When the equipment controlled by the electric control cabinet is shut down or under maintenance, the utility model inserts a "someone is working, no closing" sign into the supporting frame of the door of the electric control cabinet. Since the micro switch is connected to the control circuit, the micro switch is actuated to cut off the closing operation circuit of the electric control cabinet through the micro switch. Neither local nor remote closing operation can form a closed circuit for the circuit breaker closing coil Y9, so that the electric control cabinet is in a state where closing is impossible, thereby ensuring the safety of the equipment or equipment maintenance operation. The utility model has the advantages of simple structure, convenient operation, low transformation cost and easy implementation.

Claims

1. A protection device for preventing misoperation of an electrical control cabinet, comprising an electrical control cabinet and a circuit breaker, characterized in that: It also includes a micro switch, a supporting frame, an indicator sign, and a control circuit. The supporting frame is fixed on the front of the electrical control cabinet door, the micro switch is arranged behind the electrical control cabinet door, the indicator sign is plugged into the supporting frame, the micro switch is actuated when the indicator sign is inserted into the supporting frame, and the micro switch and the circuit breaker are connected to the control circuit.

2. The protection device for preventing misoperation of an electrical control cabinet according to claim 1, characterized in that: It also includes an operation box and an operation table, and a control circuit is connected to the operation box and the operation table; the control circuit includes a closing circuit and an opening circuit, the closing circuit includes a closing branch a, a closing branch b, and a closing branch c, the output ends of the closing branch a and the closing branch b are both connected to the closing input port of the comprehensive protection device, the input end of the closing branch c is connected to the closing output port of the comprehensive protection device, the opening circuit includes an opening branch a and a opening branch b, the output end of the opening branch a is connected to the opening input port of the comprehensive protection device, the input end of the opening branch b is connected to the opening output port of the comprehensive protection device, the input ends of the closing branch a, the closing branch b, and the opening branch a are connected to the positive pole of a DC power supply, and the output ends of the closing branch c and the opening branch b are connected to the negative pole of the DC power supply.

3. The protection device for preventing misoperation of an electrical control cabinet according to claim 2, characterized in that: The closing branch a includes the normally open contact 1 of the transfer switch SA1, the normally open contact 1 of the transfer switch SA2, and the normally closed contact of the test position SB of the circuit breaker connected in series; the closing branch b includes the normally open contact 2 of the transfer switch SA1, the normally open contact 1 of the transfer switch SAE, the normally open contact 1 of the transfer switch SAT, and the normally open auxiliary contact S9 of the circuit breaker connected in series; the normally open contact 1 of the transfer switch SAX is connected in parallel with the normally open contact 1 of the transfer switch SAT; the normally open contact 2 of the transfer switch SAE is connected in series with the normally open contact 1 of the transfer switch SAX; the closing branch c includes the normally open auxiliary contact S3 of the circuit breaker, the normally closed auxiliary contact S1 of the circuit breaker, the closing coil Y9 of the circuit breaker, the normally open contact S1.0 of the working position of the circuit breaker, and the normally closed contact of the micro switch; The transfer switches SA1, SA2 and SAE are arranged on the electrical control cabinet, the transfer switch SAT is arranged on the operating table and the transfer switch SAX is arranged on the operating box.

4. The protection device for preventing misoperation of an electrical control cabinet according to claim 2, characterized in that: The opening branch a includes the normally open contact 2 of the transfer switch SA2, the normally open contact 2 of the transfer switch SAT, and the normally open contact 2 of the transfer switch SAX connected in parallel, and the opening branch b includes the opening coil of the circuit breaker.

5. The protection device for preventing misoperation of an electrical control cabinet according to claim 2, characterized in that: The control circuit also includes an indication circuit, which includes a closing indication circuit and an opening indication circuit connected in parallel. The closing indication circuit includes a normally open auxiliary contact of the circuit breaker connected in series and an indicator light HLH1, and the indicator light HLH is connected in parallel with the indicator light HLH1. The opening indication circuit includes a normally closed auxiliary contact of the circuit breaker connected in series and an indicator light HLF1, and the indicator light HLF is connected in parallel with the indicator light HLF1. The indicator lights HLH1 and HLF1 are arranged on an operating box, and the indicator lights HLH and HLF are arranged on an operating table.

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