Intelligent operation locking system and method for alternating-current and direct-current operation power supply

Abstract

The invention provides an intelligent operation locking system and method for an AC / DC operation power supply, and the system comprises an intelligent locking device which is used for controlling the connection / disconnection of the AC / DC operation power supply according to an operation control signal so as to achieve the remote operation control, and detecting the connection / disconnection state of the AC / DC operation power supply. Therefore, an operation state signal is output and fed back to the remote control locking terminal; the intelligent approval system is used for displaying the operation result signal in an SOE form, and issuing a first operation instruction to the remote control locking terminal after password authorization; the EUT interlocking platform is used for issuing a second operation instruction to the remote control locking terminal according to the cabinet door position signal; and the remote control locking terminal is used for issuing a corresponding operation control signal to the intelligent locking device according to the operation instruction. According to the invention, remote and on-site operation of the operation power supply is realized through the intelligent locking system, and the effects of improving the through-current capability, improving the safety level, guaranteeing the personal safety and realizing five-prevention intelligent interlocking are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of operating power supply, and in particular to an intelligent operating locking system and method for an AC / DC operating power supply. Background Art

[0002] The operating power supply refers to the power supply for secondary equipment in the substation, which is used to power circuit breaker control, relay protection, automatic devices and signal equipment. When the circuit is overloaded or short-circuited, the current will increase rapidly, which may cause the power equipment to overheat or even be damaged. The high-voltage circuit breaker can cooperate with the protection device and the automatic device under the system fault to quickly cut off the fault current, prevent the accident from expanding, and ensure the safe operation of the system, thereby protecting the power system and equipment from overload and short circuit and other faults. Therefore, high-voltage circuit breakers play a vital role in the power system. The operating power supply is an important branch to ensure the normal separation and closing of the circuit breaker, but the traditional technology cannot effectively control and monitor the operating power supply of the high-voltage circuit breaker. Its shortcomings are as follows:

[0003] 1: The control method is single. The traditional technology uses manual local operation of the air switch to control the operating power supply.

[0004] 2: Weak current carrying capacity. Traditional technology uses relay control, but the breaking capacity and current carrying capacity of relay contacts are small.

[0005] 3: The safety level is low, and no approval or authorization is required for the switch control of the operating power supply.

[0006] 4: The linkage is poor. When the cabinet door with the high-voltage circuit breaker is opened, the operating power supply cannot be automatically cut off.

[0007] 5: There are great safety hazards. If the maintenance personnel fail to disconnect the power supply and directly carry out maintenance work, serious electric shock accidents may occur.

[0008] Therefore, it is necessary to design an intelligent locking system and method that can be used for safe and reliable control of AC and DC operating power supplies. Summary of the invention

[0009] The present invention provides an intelligent operation locking system and method for AC and DC operating power supplies, which are mainly used to solve the problems of the existing circuit breakers, such as single operating power supply control mode, weak current carrying capacity, low safety level, poor linkage and great safety hazards, so as to achieve the effect of increasing the current carrying capacity, improving the safety level, adding five-defense intelligent interlocking and ensuring personal safety.

[0010] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0011] An intelligent operation locking system for AC and DC operating power supplies, comprising an intelligent locking device, a remote locking terminal, an intelligent approval system and an EUT interlocking platform, wherein the AC and DC operating power supplies are connected to a circuit breaker through the intelligent locking device, the intelligent locking device establishes a communication connection with the remote locking terminal, is used to receive an operation control signal from the remote locking terminal, and controls the on / off of the AC and DC operating power supplies according to the operation control signal to realize remote operation control, and detects the on / off state of the AC and DC operating power supplies, thereby outputting an operation state signal and feeding it back to the remote locking terminal; the remote locking terminal establishes a communication connection with the intelligent approval system The intelligent approval system is used to process the operation status signal and output the operation result signal to the intelligent approval system; the intelligent approval system is used to display the operation result signal in the form of SOE, and issue the first operation instruction to the remote control locking terminal after password authorization; the EUT interlocking platform establishes a communication connection with the remote control locking terminal, which is used to collect the cabinet door position signal of the cabinet where the circuit breaker is located, and issue the second operation instruction to the remote control locking terminal according to the cabinet door position signal; the remote control locking terminal is used to analyze the first operation instruction or the second operation instruction, and issue the corresponding operation control signal to the intelligent locking device.

[0012] A further solution is that the power input end of the intelligent locking device is connected to a DC power supply or an AC power supply, and its output end is connected to the operating power supply of the circuit breaker, and it includes a communication module, an anti-error module, an operation control module and a status detection module; wherein the communication module is an RS485 bus communication module, which is used for the intelligent locking device to establish RS485 bus communication with the remote control locking terminal.

[0013] A further solution is that the operation module includes a driving optocoupler, a totem pole driving circuit, a second transistor and a rectifier bridge, the input end of the driving optocoupler is connected to the operation control signal, and the output end thereof is connected to the input end of the totem pole driving circuit, the totem pole driving circuit is used to output a level signal to the control end of the second transistor according to the operation control signal, the output end of the second transistor is connected to the control end of the rectifier bridge, the input end of the rectifier bridge is connected to the AC / DC operating power supply, and the output end thereof outputs the AC / DC operating power supply to the circuit breaker.

[0014] A further solution is that the totem pole driving circuit includes a first transistor and a third transistor, the bases of the first transistor and the third transistor are connected as input terminals connected to the output terminal of the driving optocoupler, and the emitters of the first transistor and the third transistor are connected as output terminals connected to the control terminal of the second transistor.

[0015] A further solution is that the first transistor is the upper tube of the totem pole drive circuit, adopts an NPN tube, and its collector is connected to a 15V positive power supply; the third transistor is the lower tube of the totem pole drive circuit, adopts a PNP tube, and its collector is grounded.

[0016] A further solution is that the operating power supply control method of the circuit breaker also includes: using a smart key to perform local operation.

[0017] An intelligent operation locking method for an AC / DC operating power supply, applied to an intelligent operation locking system for an AC / DC operating power supply, comprises:

[0018] When the operating power of the circuit breaker is operated locally, the intelligent locking device detects the local operation signal and uploads the local operation signal to the remote control locking terminal in real time through RS485 bus communication. The remote control locking terminal uploads the local operation record to the intelligent approval system through Ethernet communication, so as to display it in real time in the form of SOE.

[0019] After the correct password authorization is performed, the intelligent approval system sends an operation instruction to the remote control locking terminal, the remote control locking terminal analyzes the operation instruction and sends an operation control signal to the intelligent locking device, and the intelligent locking device controls the connection / disconnection of the AC and DC operating power supplies according to the operation control signal to realize remote operation control.

[0020] When it is detected that the cabinet door is in the open state, the EUT interlocking platform sends a power-off command to the remote-controlled locking terminal through RS485 bus communication. The remote-controlled locking terminal analyzes the power-off command and sends a power-off signal to the intelligent locking device. The intelligent locking device controls the disconnection of the AC and DC operating power supplies according to the power-off signal.

[0021] A further solution is that the local operation and the remote operation of the operating power supply of the circuit breaker are not performed simultaneously.

[0022] The local operation has a higher priority than the remote operation.

[0023] A further solution is that when the intelligent locking device detects the local operation signal and receives the operation control signal from the remote locking terminal, the intelligent locking device defaults that the remote operation control signal is invalid.

[0024] A further solution is that when it is detected that the cabinet door is in an open state, the method further includes:

[0025] The intelligent locking device uploads the power-off status signal to the remote-controlled locking terminal for processing, and the remote-controlled locking terminal uploads the power-off status signal and the cabinet door opening status signal to the intelligent approval system for real-time display. At this time, the intelligent approval system prohibits remote issuance of the operation instruction.

[0026] It can be seen that the present invention has the following beneficial effects:

[0027] 1. The present invention uses an intelligent operation locking system to monitor the local operation of the circuit breaker operating power supply and remotely control the operation. Compared with the traditional method of manually operating the air switch locally, the present invention realizes diversified control through local and remote operations, no longer relies on on-site manual operation, and improves the flexibility of operation.

[0028] 2. The intelligent locking device of the present invention adopts a rectifier bridge + IGBT method to control the on and off of the AC and DC operating power supplies. Compared with the traditional method of relay control, its overcurrent capacity is large, generally reaching several A to tens of A, ensuring the safety and stability of system control.

[0029] 3. The intelligent approval system of the present invention can only issue commands to the remote control locking terminal through Ethernet communication under the condition of authorization / approval, preventing the operating power supply from being controlled without any approval or authorization, thereby improving the security level of the system.

[0030] 4. The present invention has five-defense intelligent interlocking functions. The EUT interlocking platform links the power off control with the cabinet door opening control. The cabinet door position signal is collected in real time by the EUT. When the cabinet door is detected to be opened, the operating power supply can be automatically cut off, avoiding the risk of live operation by operators during maintenance and ensuring the personal safety of operators.

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the intelligent operation locking system for AC and DC operating power supplies of the present invention.

[0033] Figure 2 It is a schematic diagram of the intelligent locking device of the present invention.

[0034] Figure 3 It is a circuit principle diagram of the operating module of the intelligent locking device of the present invention.

[0035] Figure 4 It is a flow chart of the intelligent operation locking method for AC and DC operating power supplies of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment of intelligent operation locking system for AC and DC operating power supply

[0038] See also Figure 1 The present invention relates to an intelligent operation locking system for AC / DC operating power supply, comprising an intelligent locking device 10, a remote locking terminal 20, an intelligent approval system 30 and an EUT interlocking platform 40. The AC / DC operating power supply is connected to the circuit breaker through the intelligent locking device 10. The intelligent locking device 10 establishes a communication connection with the remote locking terminal 20, and is used to receive an operation control signal from the remote locking terminal 20, and control the connection / disconnection of the AC / DC operating power supply according to the operation control signal to realize remote operation control, and detect the connection / disconnection state of the AC / DC operating power supply, thereby outputting an operation state signal and feeding it back to the remote locking terminal 20; the remote locking terminal 20 and the intelligent approval system 30 are connected to the circuit breaker 40, and the intelligent locking device 10 and the remote locking terminal 20 are connected to the circuit breaker 40. The EUT interlocking platform 40 establishes a communication connection with the remote control locking terminal 20, which is used to process the operation status signal and output the operation result signal to the intelligent approval system 30; the intelligent approval system 30 is used to display the operation result signal in the form of SOE, and issue a first operation instruction to the remote control locking terminal 20 after password authorization; the EUT interlocking platform 40 establishes a communication connection with the remote control locking terminal 20, which is used to collect the cabinet door position signal of the cabinet where the circuit breaker is located, and issue a second operation instruction to the remote control locking terminal 20 according to the cabinet door position signal; the remote control locking terminal 20 is used to analyze the first operation instruction or the second operation instruction, and issue the corresponding operation control signal to the intelligent locking device 10.

[0039] Specifically, the intelligent approval system 30 of this embodiment includes a SOE (Sequence Of Event) module and a host computer. The SOE module adopts Ethernet distributed event sequence recording to record the occurrence time of the operation status signal uploaded by the remote control locking terminal 20, the interval sequence of the first event and the chain event. The host computer is provided with SOE history recording software, and the operation history record is displayed in the form of SOE through the host computer, which is used to intuitively feedback to the remote operator whether the remote operation is successful, and can timely feedback the local operation information and the cabinet door opening information, so as to timely remind the remote operator of the real-time operation status of the circuit breaker operation power supply, and select the corresponding operation strategy accordingly to avoid the personal safety risk of the local operator caused by the wrong remote operation.

[0040] Specifically, the remote control locking terminal 20 of this embodiment is used for signal analysis, processing and forwarding to realize communication between the intelligent locking device 10 and the intelligent approval system 30 and the EUT interlocking platform 40. The signal processing includes signal enhancement, signal filtering and error correction, etc., to improve the quality and reliability of the signal; the remote control locking terminal 20 can send the real-time operation status information from the intelligent locking device 10 and the cabinet door position information of the EUT interlocking platform 40 and other signals to the intelligent approval system 30 for real-time display, thereby realizing signal relay and remote management control.

[0041] Specifically, the EUT (Equipment Under Test) interlocking platform of this embodiment collects the cabinet door position signal in real time through the EUT. The EUT interlocking platform 40 analyzes the cabinet door position signal to determine whether the cabinet door is in an open state at this time. If it is in an open state, a power-off command is issued in time to turn off the power to prevent local operators from working with power on.

[0042] See also Figure 2 In this embodiment, the power input end of the intelligent locking device 10 is connected to a DC power supply or an AC power supply, and its output end is connected to the operating power supply of the circuit breaker. It includes a communication module, an anti-error module, an operation control module and a status detection module; wherein the communication module is an RS485 bus communication module, which is used for the intelligent locking device 10 to establish RS485 bus communication with the remote control locking terminal 20.

[0043] Specifically, the intelligent locking device 10 of this embodiment establishes a two-way communication loop with the remote locking terminal 20 through the communication module, which is used for issuing operation instructions and feedback of operation execution results and local operation status;

[0044] Specifically, the intelligent locking device 10 of the present embodiment realizes the five-protection interlock of the circuit breaker through the control of the anti-error module, and the five-protection interlock includes: (1) preventing the circuit breaker from being opened or closed by mistake; (2) preventing the disconnector from being opened or closed under load; (3) preventing the grounding wire from being hung or the grounding knife switch from being closed under power; (4) preventing the circuit breaker from being closed and powering on with the grounding wire or the grounding switch; and (5) preventing the circuit breaker from being accidentally entered into the energized interval.

[0045] Among them, this embodiment connects the auxiliary switch contacts of the circuit breaker, isolating switch and grounding switch in series into the control circuit of the electromagnetic lock on the cabinet door. The anti-error module controls the switching state of the electromagnetic lock by controlling the power on and off of the electromagnetic lock, thereby achieving the purpose of anti-error.

[0046] For example, the five-protection interlocking system of high-voltage switchgear includes: (1) After the circuit breaker in the high-voltage switchgear is closed in the test position, the circuit breaker cannot enter the working position. (2) When the earthing knife in the high-voltage switchgear is in the closed position, the circuit breaker cannot enter the closed position; (3) When the circuit breaker in the high-voltage switchgear is closed, the earthing knife is locked with the cabinet door; (4) When the vacuum circuit breaker in the high-voltage switchgear is closed during operation, the earthing knife cannot be put into operation; (5) When the circuit breaker in the high-voltage switchgear is closed during operation, it cannot exit the working position of the circuit breaker.

[0047] See also Figure 3 In this embodiment, the operation module includes a driving optocoupler TF1, a totem pole driving circuit, a second transistor Q2 and a rectifier bridge B1. The input end of the driving optocoupler TF1 is connected to the operation control signal, and its output end is connected to the input end of the totem pole driving circuit. The totem pole driving circuit is used to output a level signal to the control end of the second transistor Q2 according to the operation control signal. The output end of the second transistor Q2 is connected to the control end of the rectifier bridge B1. The input end of the rectifier bridge B1 is connected to the AC power supply, and its output end outputs a DC power supply to the circuit breaker.

[0048] Specifically, the second transistor Q2 of this embodiment adopts a MOS tube of model CRG40T120AK3SD, whose maximum collector current reaches 40A and has a large overcurrent capability.

[0049] Specifically, the model of the rectifier bridge B1 in this embodiment is GBU1510, which can withstand a voltage of up to 1000V, and the voltage drop is only 1.0V. It has the advantages of high voltage resistance and low voltage drop, and can effectively improve the rectification efficiency.

[0050] In this embodiment, the totem pole driving circuit includes a first transistor Q1 and a third transistor Q3, the bases of the first transistor Q1 and the third transistor Q3 are connected as input ends connected to the output end of the driving optocoupler TF1, and the emitters of the first transistor Q1 and the third transistor Q3 are connected as output ends connected to the control end of the second transistor Q2.

[0051] In this embodiment, the first transistor Q1 is the upper tube of the totem pole driving circuit, which is an NPN tube, and its collector is connected to a 15V positive power supply; the third transistor Q3 is the lower tube of the totem pole driving circuit, which is a PNP tube, and its collector is grounded.

[0052] Specifically, in this embodiment, the first transistor Q1 adopts a high-voltage NPN bipolar transistor of model MMBT5551, and the third transistor Q3 adopts a high-voltage PNP bipolar transistor of model MMBT5401.

[0053] Specifically, the operating module described in this embodiment also includes resistors R3, R5 and Zener diodes D1, D2. The emitters of the first transistor Q1 and the third transistor Q3 are connected to the gate of the second transistor Q2 through the resistor R3. The source of the second transistor Q2 is grounded, and the resistor R5 is connected in parallel at both ends of its gate and source. It is also connected to Zener diodes D1 and D2 connected in reverse series. The anode of the Zener diode D1 is connected to the gate of the second transistor Q2, and the anode of the Zener diode D2 is connected to the source of the second transistor Q2.

[0054] In this embodiment, the operating power supply control method of the circuit breaker also includes: using the smart key 50 for local operation.

[0055] Specifically, the on-site operation of this embodiment is: the on-site mechanical rotation of the smart key 50 controls the on-site operation of the power supply. When the smart key 50 is inserted, the smart locking device 10 detects the real-time operation status of "on-site operation".

[0056] An embodiment of an intelligent operation locking method for AC and DC operating power supply

[0057] See also Figure 4 The intelligent operation locking method for AC / DC operating power supply of the present invention is applied to the intelligent operation locking system for AC / DC operating power supply, comprising:

[0058] When the operating power of the circuit breaker is operated locally, the intelligent locking device 10 detects the local operation signal and uploads the local operation signal to the remote control locking terminal 20 in real time through RS485 bus communication. The remote control locking terminal 20 uploads the local operation record to the intelligent approval system 30 through Ethernet communication so that it can be displayed in real time in the form of SOE.

[0059] Specifically, this embodiment can effectively remind remote operators that there is no need to repeatedly issue operation commands through the detection of local operations; at the same time, the local operation adopts a direct connection with a rotary switch, and when the intelligent locking device 10 is abnormal or damaged, it will not affect the local connection and disconnection of the power supply.

[0060] After the correct password authorization is performed, the intelligent approval system 30 sends an operation instruction to the remote control locking terminal 20, the remote control locking terminal 20 analyzes the operation instruction and sends an operation control signal to the intelligent locking device 10, and the intelligent locking device 10 controls the connection / disconnection of the AC and DC operating power supplies according to the operation control signal to realize remote operation control.

[0061] Specifically, the remote operation of this embodiment requires password operation of the intelligent approval system 30. Only when the password is entered correctly, the intelligent approval system 30 will send a command to the remote control locking terminal 20 through Ethernet communication to prevent the operating power supply from being controlled without any approval or authorization, thereby improving the security level of the system.

[0062] When it is detected that the cabinet door position is in the open state, the EUT interlocking platform 40 sends a power shutdown command to the remote control locking terminal 20 through RS485 bus communication. The remote control locking terminal 20 analyzes the power shutdown command and sends a power shutdown signal to the intelligent locking device 10. The intelligent locking device 10 controls the disconnection of the AC and DC operating power supplies according to the power shutdown signal.

[0063] In this embodiment, the local operation and the remote operation of the operating power supply of the circuit breaker are not performed simultaneously.

[0064] The local operation has a higher priority than the remote operation.

[0065] In this embodiment, when the intelligent locking device 10 detects the local operation signal and receives the operation control signal from the remote locking terminal 20, the intelligent locking device 10 defaults to the invalid operation control signal.

[0066] In this embodiment, when it is detected that the cabinet door is in an open state, the method further includes:

[0067] The intelligent locking device 10 uploads the power-off status signal to the remote locking terminal 20 for processing, and the remote locking terminal 20 uploads the power-off status signal and the door opening status signal to the intelligent approval system 30 for real-time display. At this time, the intelligent approval system 30 prohibits remote issuance of the operation instruction.

[0068] Specifically, this embodiment links the power off control with the cabinet door opening control through the EUT interlocking platform 40. When the cabinet door is opened, the operating power can be automatically cut off, avoiding the risk of live operation by operators during maintenance and ensuring the personal safety of operators.

[0069] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An intelligent operation locking system for AC and DC operating power supplies, characterized in that: include: An intelligent locking device, a remote locking terminal, an intelligent approval system and an EUT interlocking platform, wherein the AC and DC operating power supplies are connected to the circuit breaker through the intelligent locking device, and the intelligent locking device establishes a communication connection with the remote locking terminal, and is used to receive an operation control signal from the remote locking terminal, and control the on / off of the AC and DC operating power supplies according to the operation control signal to realize remote operation control, and detect the on / off state of the AC and DC operating power supplies, thereby outputting an operation state signal and feeding it back to the remote locking terminal; the remote locking terminal establishes a communication connection with the intelligent approval system, and is used to perform signal processing on the operation state signal, and output an operation result signal to send to the intelligent approval system; The intelligent approval system is used to display the operation result signal in the form of SOE, and send the first operation instruction to the remote control locking terminal after password authorization; the EUT interlocking platform establishes a communication connection with the remote control locking terminal to collect the cabinet door position signal of the cabinet where the circuit breaker is located, and send the second operation instruction to the remote control locking terminal according to the cabinet door position signal; the remote control locking terminal is used to analyze the first operation instruction or the second operation instruction, and send the corresponding operation control signal to the intelligent locking device.

2. The intelligent operation locking system for AC and DC operating power supply according to claim 1, characterized in that: The power input end of the intelligent locking device is connected to a DC power supply or an AC power supply, and its output end is connected to the operating power supply of the circuit breaker. It includes a communication module, an anti-error module, an operation control module and a status detection module; wherein the communication module is an RS485 bus communication module, which is used for the intelligent locking device to establish RS485 bus communication with the remote control locking terminal.

3. The intelligent operation locking system for AC and DC operating power supply according to claim 2, characterized in that: The operation module includes a driving optocoupler, a totem pole driving circuit, a second transistor and a rectifier bridge. The input end of the driving optocoupler is connected to the operation control signal, and the output end thereof is connected to the input end of the totem pole driving circuit. The totem pole driving circuit is used to output a level signal to the control end of the second transistor according to the operation control signal. The output end of the second transistor is connected to the control end of the rectifier bridge. The input end of the rectifier bridge is connected to the AC / DC operating power supply, and the output end thereof outputs the AC / DC operating power supply to the circuit breaker.

4. The intelligent operation locking system for AC and DC operating power supply according to claim 3, characterized in that: The totem pole driving circuit includes a first transistor and a third transistor, wherein the bases of the first transistor and the third transistor are connected as input ends connected to the output end of the driving optocoupler, and the emitters of the first transistor and the third transistor are connected as output ends connected to the control end of the second transistor.

5. The intelligent operation locking system for AC and DC operating power supply according to claim 4, characterized in that: The first transistor is the upper transistor of the totem pole driving circuit, adopts an NPN transistor, and its collector is connected to a 15V positive power supply; the third transistor is the lower transistor of the totem pole driving circuit, adopts a PNP transistor, and its collector is grounded.

6. The intelligent operation locking system for AC and DC operating power supply according to claim 1, characterized in that: The operating power supply control method of the circuit breaker also includes: using a smart key to perform local operation.

7. An intelligent operation locking method for AC and DC operating power supplies, characterized in that: An intelligent operation locking system for an AC / DC operating power supply as claimed in any one of claims 1 to 6, comprising: When the operating power of the circuit breaker is operated locally, the intelligent locking device detects the local operation signal and uploads the local operation signal to the remote control locking terminal in real time through RS485 bus communication. The remote control locking terminal uploads the local operation record to the intelligent approval system through Ethernet communication so as to display it in real time in the form of SOE; After the correct password authorization is performed, the intelligent approval system sends an operation instruction to the remote control locking terminal, the remote control locking terminal analyzes the operation instruction, and sends an operation control signal to the intelligent locking device, and the intelligent locking device controls the connection / disconnection of the AC and DC operating power supplies according to the operation control signal to realize remote operation control; When it is detected that the cabinet door is in the open state, the EUT interlocking platform sends a power-off command to the remote-controlled locking terminal through RS485 bus communication. The remote-controlled locking terminal analyzes the power-off command and sends a power-off signal to the intelligent locking device. The intelligent locking device controls the disconnection of the AC and DC operating power supplies according to the power-off signal.

8. The intelligent operation locking method for AC / DC operating power supply according to claim 7, characterized in that: The local operation and remote operation of the operating power supply of the circuit breaker are not performed simultaneously; The local operation has a higher priority than the remote operation.

9. The intelligent operation locking method for AC / DC operating power supply according to claim 8, characterized in that: When the intelligent locking device detects the local operation signal and receives the operation control signal from the remote locking terminal at the same time, the intelligent locking device defaults that the remote operation control signal is invalid.

10. The intelligent operation locking method for AC / DC operating power supply according to claim 7, characterized in that: When the cabinet door is detected to be in the open state, it also includes: The intelligent locking device uploads the power-off status signal to the remote-controlled locking terminal for processing, and the remote-controlled locking terminal uploads the power-off status signal and the cabinet door opening status signal to the intelligent approval system for real-time display. At this time, the intelligent approval system prohibits remote issuance of the operation instruction.

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