110kv knife switch secondary circuit training demonstration device and its verification method

Abstract

The present application relates to a kind of 110kV knife switch secondary circuit training demonstration device and its verification method, the device includes movable support and demonstration board, demonstration board is provided with electrical diagram display area, device display area, operation area and function verification area, function verification area is provided with knife switch closing verification module, knife switch opening verification module and abnormality verification module, electrical diagram display area is provided with knife switch secondary control circuit and external interlocking circuit, operation area is provided with the operation switch for controlling the operation of knife switch secondary control circuit and external interlocking circuit.The device can be required by switch and operation, etc. Component and device, such as the device display area, are laid out on the same plane by electrical diagram display area, device display area, operation area and function verification area, synchronous analysis is carried out in combination with the knife switch secondary control circuit and external interlocking circuit shown in electrical diagram display area, can accurately simulate the secondary circuit in knife switch opening and closing operation, and show to scholar, provide intuitive training effect.

Description

Technical Field

[0001] This invention relates to the field of training technology for secondary circuits in substation engineering, and in particular to a training demonstration device for secondary circuits of 110kV disconnectors and its verification method. Background Technology

[0002] With the development of smart grids, in order to improve the equipment fault analysis capabilities of grassroots substation operation and maintenance personnel and enhance their technical skills, it is necessary to regularly train operation and maintenance personnel on the working principles of electrical equipment and fault diagnosis methods, based on their professional work requirements. In particular, it is essential to conduct comprehensive and intuitive analysis and learning on the secondary control circuits, where knowledge is often weak, to further equip operation and maintenance personnel with the ability to fully ensure the safety and reliability of daily operation and maintenance of substation equipment.

[0003] Currently, training on the secondary control circuits of primary equipment disconnectors in substations is limited to physical demonstrations and on-site equipment instruction. Because components are installed on different planes within the substation, and local space may be severely limited, there is a lack of intuitive, dedicated training spaces and facilities. Furthermore, the compact wiring layout of secondary circuits within the equipment enclosures makes them difficult to clearly demonstrate, posing a significant challenge for beginners in maintenance. Additionally, the training process for operation and maintenance personnel is greatly affected by outdoor environmental factors, hindering the regular implementation of skills training activities. Based on these issues, there is an urgent need for an open, visual training and teaching device suitable for substation equipment, enabling frontline operation and maintenance personnel to improve their ability to troubleshoot and analyze equipment secondary circuit faults and their technical skills. Summary of the Invention

[0004] This invention provides a training demonstration device and verification method for the secondary circuit of a 110kV disconnector, which solves the technical problem that existing training on the secondary control circuit of disconnectors in substation primary equipment cannot demonstrate the wiring of the substation secondary circuit, resulting in poor training effectiveness.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A training and demonstration device for the secondary circuit of a 110kV disconnector includes a movable support and a demonstration board mounted on the support. The demonstration board is provided with an electrical diagram display area, a component display area, an operation area, and a function verification area. The function verification area is provided with a disconnector closing verification module, a disconnector opening verification module, and an anomaly verification module. The electrical diagram display area is provided with a disconnector secondary control circuit and an external interlocking circuit. The operation area is provided with an operation switch for controlling the operation of the disconnector secondary control circuit and the external interlocking circuit.

[0007] The disconnector closing verification module is used to control the external interlocking circuit to meet the five-prevention tripping conditions through the operation switch, and then use the closing switch of the operation switch to control the secondary control circuit of the disconnector to perform closing verification.

[0008] The disconnector tripping verification module is used to control the external interlocking circuit to meet the five-prevention closing conditions through the operation switch, and then use the tripping switch of the operation switch to control the secondary control circuit of the disconnector to perform tripping verification.

[0009] The anomaly verification module is used to perform anomaly verification by detecting the voltage at the connection terminal in the secondary control circuit of the disconnector and the operating status of the actuator in the secondary control circuit of the disconnector, based on the fact that the operating switch is in an abnormal state.

[0010] Preferably, the operating switch includes a tripping limit switch, an interlocking switch, a motor protection switch, an overload protection switch, a transfer switch, a power air switch, a closing switch, and a tripping switch; the external interlocking circuit is provided with a first circuit breaker, a first grounding switch, a second grounding switch, and a third grounding switch connected in sequence, the second grounding switch being connected to a first connection terminal, and the third grounding switch being connected to a second connection terminal.

[0011] Preferably, the five-prevention tripping conditions are as follows: the tripping microswitch of the tripping and closing limit switch is switched to the tripping position and its normally closed contact is opened; the normally closed contact of the closing microswitch of the tripping and closing limit switch is closed; the switches of the first circuit breaker, the first grounding switch, the second grounding switch, and the third grounding switch are switched to the tripping position, so that the external interlocking circuit is connected; the power air switch, the motor protection switch, and the overload protection switch are all turned on; the transfer switch is grounded; and the interlocking switch is switched to the motor position.

[0012] The closing verification of the disconnector secondary control circuit controlled by the closing switch of the aforementioned operating switch includes:

[0013] The closing switch of the aforementioned operating switch is used to perform a closing operation on the secondary control circuit of the disconnector. If the opening coil of the secondary control circuit of the disconnector is not energized, the closing coil is energized, and the actuator rotates in the forward direction;

[0014] The closing microswitch of the limit switch is controlled to the closing position and its normally closed contact is opened. If the closing circuit of the secondary control circuit of the disconnector is de-energized, the closing coil is not energized, and the actuator stops working, the closing verification of the secondary control circuit of the disconnector is completed.

[0015] Preferably, the five-prevention closing conditions are as follows: the closing microswitch of the opening and closing limit switch is switched to the closing position and its normally closed contact is opened; the opening microswitch of the opening and closing limit switch is switched to the opening position and its normally closed contact is closed; the switches of the first circuit breaker, the first grounding switch, the second grounding switch, and the third grounding switch are switched to the opening position, so that the external interlocking circuit is connected; the power air switch, the motor protection switch, and the overload protection switch are all turned on, the transfer switch is grounded, and the interlocking switch is switched to the motor position.

[0016] The tripping verification of the disconnector secondary control circuit controlled by the tripping switch of the aforementioned operating switch includes:

[0017] The tripping switch of the aforementioned operating switch is used to trip the secondary control circuit of the disconnector. If the closing coil of the secondary control circuit of the disconnector is not energized, the tripping coil is energized, and the actuator reverses;

[0018] The microswitch controlling the opening and closing limit switch is moved to the opening position and its normally closed contact is opened. If the opening circuit of the secondary control circuit of the disconnector is de-energized, the opening coil is not energized, and the actuator stops working, the opening verification of the secondary control circuit of the disconnector is completed.

[0019] Preferably, the anomaly verification, based on the abnormality of the operating switch, includes detecting the voltage at the connection terminal in the secondary control circuit of the disconnector and the operating status of the actuator in the secondary control circuit of the disconnector, including:

[0020] The first voltage at the first measuring connection terminal to ground, the second voltage at the opening connection terminal to ground, and the third voltage at the closing connection terminal to ground in the secondary control circuit of the disconnector are obtained. If the first voltage is 220V and the second voltage is 0V or the third voltage is 0V, then the secondary control circuit of the disconnector is in an abnormal state where the changeover switch is not switched and its normally closed contact is not closed.

[0021] Obtain the fourth voltage of the second measuring connection terminal to the live wire in the secondary control circuit of the disconnector and the fifth voltage of the interlock switch to the live wire. If the fourth voltage is 220V and the fifth voltage is not 220V, then the secondary control circuit of the disconnector is in an abnormal state where the interlock switch is not switched and its normally closed contact is not closed.

[0022] When the motor protection switch and the overload protection switch are working, if the closing coil or opening coil in the secondary control circuit of the disconnect switch is de-energized, the secondary control circuit of the disconnect switch will be in an abnormal state in which the actuator cannot work.

[0023] Preferably, the anomaly verification module is further configured to obtain the sixth voltage of the third measuring connection terminal to the live wire and the seventh voltage of the fourth measuring connection terminal to the live wire in the secondary control circuit of the switch, based on whether the first circuit breaker, the first grounding switch, the second grounding switch or the third grounding switch is in the closed state; if the sixth voltage is 220V and the seventh voltage is not 220V, then the external interlocking circuit is in an abnormal state of being disconnected.

[0024] Preferably, the 110kV disconnector secondary circuit training demonstration device includes a drive display module, which drives the operation of display elements. The display elements are installed at the connection points of various devices in the disconnector secondary control circuit and the external interlocking circuit. The display elements are used to monitor the operation status of the disconnector secondary control circuit and the external interlocking circuit in real time. The drive display module includes a microprocessor and a display drive submodule and a signal transmission submodule connected to the microprocessor. The microprocessor outputs electrical signals to control the operation of the display elements, and the display drive submodule and the signal transmission submodule transmit the electrical signals to the display elements.

[0025] The present invention also provides a verification method for a 110kV disconnector secondary circuit training demonstration device, which is applied to the aforementioned 110kV disconnector secondary circuit training demonstration device. The verification method includes the following steps:

[0026] The external interlocking circuit is controlled by operating the switch to meet the five-proof tripping conditions. Then, the closing switch of the operating switch is used to control the secondary control circuit of the knife switch for closing verification.

[0027] The external interlocking circuit is controlled by the operating switch to meet the five-proof closing conditions. Then, the opening switch of the operating switch is used to control the secondary control circuit of the knife switch for opening verification.

[0028] If the operating switch is abnormal, the abnormality is checked by detecting the voltage at the connection terminal in the secondary control circuit of the disconnect switch and the operation of the actuator in the secondary control circuit of the disconnect switch.

[0029] The five-proof tripping conditions are as follows: the tripping microswitch of the control tripping and closing limit switch is thrown to the tripping position and its normally closed contact is open; the normally closed contact of the closing microswitch of the control tripping and closing limit switch is closed; the switches of the first circuit breaker, the first grounding switch, the second grounding switch, and the third grounding switch are thrown to the tripping position to make the external interlocking circuit open; the control air switch, the motor protection switch, and the overload protection switch are all open; the transfer switch is grounded; and the interlocking switch is thrown to the electric position.

[0030] The five-prevention closing conditions are as follows: the closing microswitch of the control limit switch is thrown to the closing position and its normally closed contact is open; the opening microswitch of the control limit switch is thrown to the opening position and its normally closed contact is closed; the switches of the first circuit breaker, the first grounding switch, the second grounding switch, and the third grounding switch are thrown to the opening position to make the external interlocking circuit conduct; the power air switch, the motor protection switch, and the overload protection switch are all turned on, the transfer switch is grounded, and the interlocking switch is thrown to the electric position.

[0031] Preferably, the closing verification of the disconnector secondary control circuit using the closing switch of the operating switch includes:

[0032] The closing switch of the aforementioned operating switch is used to perform a closing operation on the secondary control circuit of the disconnector. If the opening coil of the secondary control circuit of the disconnector is not energized, the closing coil is energized, and the actuator rotates in the forward direction;

[0033] The closing microswitch of the limit switch is controlled to the closing position and its normally closed contact is opened. If the closing circuit of the secondary control circuit of the disconnector is de-energized, the closing coil is not energized, and the actuator stops working, the closing verification of the secondary control circuit of the disconnector is completed.

[0034] The tripping verification of the disconnector secondary control circuit controlled by the tripping switch of the aforementioned operating switch includes:

[0035] The tripping switch of the aforementioned operating switch is used to trip the secondary control circuit of the disconnector. If the closing coil of the secondary control circuit of the disconnector is not energized, the tripping coil is energized, and the actuator reverses;

[0036] The opening microswitch of the control limit switch is moved to the opening position and its normally closed contact is opened. If the opening circuit of the secondary control circuit of the disconnector is de-energized, the opening coil is not energized and the actuator stops working, the opening verification of the secondary control circuit of the disconnector is completed.

[0037] If the operating switch is malfunctioning, the malfunction verification is performed by detecting the voltage at the connection terminals in the secondary control circuit of the disconnector and the operating status of the actuators in the secondary control circuit of the disconnector, including:

[0038] The first voltage at the first measuring connection terminal to ground, the second voltage at the opening connection terminal to ground, and the third voltage at the closing connection terminal to ground in the secondary control circuit of the disconnector are obtained. If the first voltage is 220V and the second voltage is 0V or the third voltage is 0V, then the secondary control circuit of the disconnector is in an abnormal state where the changeover switch is not switched and its normally closed contact is not closed.

[0039] Obtain the fourth voltage of the second measuring connection terminal to the live wire in the secondary control circuit of the disconnector and the fifth voltage of the interlock switch to the live wire. If the fourth voltage is 220V and the fifth voltage is not 220V, then the secondary control circuit of the disconnector is in an abnormal state where the interlock switch is not switched and its normally closed contact is not closed.

[0040] When the motor protection switch and the overload protection switch are working, if the closing coil or opening coil in the secondary control circuit of the disconnect switch is de-energized, the secondary control circuit of the disconnect switch will be in an abnormal state in which the actuator cannot work.

[0041] Preferably, the verification method of the 110kV disconnector secondary circuit training demonstration device includes: based on the first circuit breaker, the first grounding switch, the second grounding switch, or the third grounding switch being in the closed state, obtaining the sixth voltage of the third measuring connection terminal to the live wire and the seventh voltage of the fourth measuring connection terminal to the live wire in the disconnector secondary control circuit; if the sixth voltage is 220V and the seventh voltage is not 220V, then the external interlocking circuit is in an abnormal state of being disconnected.

[0042] As can be seen from the above technical solutions, the embodiments of the present invention have the following advantages: The 110kV disconnector secondary circuit training demonstration device and its verification method include a movable bracket and a demonstration board. The demonstration board is provided with an electrical diagram display area, a device display area, an operation area and a function verification area. The function verification area is provided with a disconnector closing verification module, a disconnector opening verification module and an anomaly verification module. The electrical diagram display area is provided with a disconnector secondary control circuit and an external interlocking circuit. The operation area is provided with an operation switch for controlling the operation of the disconnector secondary control circuit and the external interlocking circuit. This 110kV disconnector secondary circuit training and demonstration device, through its electrical diagram display area, component display area, operation area, and function verification area, can display the switches and operating components required for disconnector opening and closing operations on the same plane. Combined with the synchronous analysis of the disconnector secondary control circuit and external interlocking circuit displayed in the electrical diagram display area, it can accurately simulate the secondary circuit in disconnector opening and closing operations and demonstrate it to learners, providing an intuitive training effect. Furthermore, through the disconnector closing verification module, disconnector opening verification module, and anomaly verification module in the function verification area, after manually setting fault defects, the training on fault point diagnosis can be carried out through the cooperation between the operation area, electrical diagram display area, and component display area, enhancing the training effect. This solves the technical problem of existing training on the secondary control circuit knowledge of disconnectors in substation primary equipment, which cannot demonstrate the wiring of substation secondary circuits and has poor training effect. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of the 110kV disconnector secondary circuit training and demonstration device according to an embodiment of the present invention;

[0045] Figure 2 This is the electrical schematic diagram of the secondary control circuit of the disconnector in the 110kV disconnector secondary circuit training demonstration device described in this embodiment of the invention;

[0046] Figure 3 The electrical schematic diagram of the external interlocking circuit in the 110kV disconnector secondary circuit training demonstration device described in this embodiment of the invention;

[0047] Figure 4 This is a framework diagram of the drive display module in the 110kV disconnector secondary circuit training demonstration device according to an embodiment of the present invention. Detailed Implementation

[0048] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0049] This application proposes a training demonstration device and verification method for the secondary circuit of a 110kV disconnector, which solves the technical problem that existing training on the secondary control circuit of disconnectors in substation primary equipment cannot demonstrate the wiring of the substation secondary circuit, resulting in poor training effectiveness.

[0050] Example 1:

[0051] Figure 1 This is a schematic diagram of the structure of the 110kV disconnector secondary circuit training and demonstration device according to an embodiment of the present invention. Figure 2 This is the electrical schematic diagram of the secondary control circuit of the disconnector in the 110kV disconnector secondary circuit training and demonstration device described in this embodiment of the invention. Figure 3 This is the electrical schematic diagram of the external interlocking circuit in the 110kV disconnector secondary circuit training demonstration device described in this embodiment of the invention. Figure 4This is a framework diagram of the drive display module in the 110kV disconnector secondary circuit training demonstration device according to an embodiment of the present invention.

[0052] like Figures 1 to 2 As shown, the present invention provides a training and demonstration device for a 110kV disconnector secondary circuit, including a movable bracket 10 and a demonstration board 20 mounted on the bracket 10. The demonstration board 20 is provided with an electrical diagram display area 21, a component display area 22, an operation area 23, and a function verification area 24. The function verification area 24 is provided with a disconnector closing verification module 241, a disconnector opening verification module 242, and an anomaly verification module 243. The electrical diagram display area 21 is provided with a disconnector secondary control circuit and an external interlocking circuit. The operation area 23 is provided with an operation switch for controlling the operation of the disconnector secondary control circuit and the external interlocking circuit.

[0053] like Figure 1 As shown, in this embodiment of the invention, the bracket 10 is used to support the demonstration board 20.

[0054] It should be noted that the bracket 10 includes a support frame 11 and a pulley 12 installed at the bottom of the support frame 11. The bracket 10 of this 110kV disconnector secondary circuit training demonstration device moves the demonstration board 20 through the pulley 12. Combined with the lightweight and small size of the demonstration board 20, classroom-style training of this 110kV disconnector secondary circuit training demonstration device can be realized, allowing for hands-on practice anytime and anywhere. Faults can also be set up for competitions to find defects.

[0055] like Figure 2 and Figure 3 As shown, in this embodiment of the invention, the electrical diagram display area 21 is used to display the electrical schematic diagrams of the secondary control circuit and the external interlocking circuit of the disconnect switch.

[0056] It should be noted that the secondary control circuit of the disconnect switch includes a motor circuit, a control circuit, a heating and lighting circuit, and a display element. The motor circuit includes an opening circuit and a closing circuit, which control the operation of the actuator. The control circuit is used to control the operation of the motor circuit via an operating switch. The heating and lighting circuit provides illumination. The display element indicates whether the control circuit wiring is properly energized.

[0057] like Figure 1 As shown, in this embodiment of the invention, the device display area 22 is used to display the various components in the secondary control circuit and external interlocking circuit of the disconnect switch.

[0058] It should be noted that the components include limit switches SL1 / SL2, changeover switch QC, air circuit breaker QF, closing switch SB1, opening switch SB3, actuators, contactors, etc. The actuators can be motors.

[0059] like Figure 1 As shown, in this embodiment of the invention, the operating area 23 is used to house the operating switches for controlling the operation of the secondary control circuit and the external interlocking circuit of the disconnect switch. The operating switches include the opening and closing limit switches SL1 / SL2, the interlocking switch SL3, the motor protection switch GDH, the overload protection switch KT, the transfer switch QC, the power air switch QF, the closing switch SB1, and the opening switch SB3.

[0060] It should be noted that terminal blocks 18 are installed on the operating area 23. Terminal blocks 18 are connected to the respective connection terminals of the secondary control circuit and the external interlocking circuit of the control switch. This facilitates the detection of voltage at each connection terminal of the secondary control circuit and the external interlocking circuit through the terminal blocks 18, allowing for the determination of whether the secondary control circuit and the external interlocking circuit are functioning correctly. This greatly promotes the rapid mastery of secondary circuit principles and troubleshooting methods by substation workers, saves on training costs, and significantly improves training quality and efficiency. In this embodiment, the power circuit breaker QF includes a motor power switch QF1, a control power switch QF2, and a lighting and heating power switch QF3.

[0061] like Figure 3 As shown, in this embodiment of the invention, both the secondary control circuit of the disconnect switch and the external interlocking circuit use 220V AC mains input, which has a high degree of compatibility with the external power supply. The external interlocking circuit is equipped with a first circuit breaker 1DL, a first grounding switch 01G, a second grounding switch 04G1, and a third grounding switch 04G2 connected in sequence. The second grounding switch 04G1 is also connected to the first connection terminal 1N7, and the third grounding switch 04G2 is also connected to the second connection terminal 4N7.

[0062] like Figure 1 As shown, in this embodiment of the invention, the disconnector closing verification module 241 is used to control the external interlocking circuit to meet the five-prevention opening conditions by operating the switch, and then uses the closing switch of the operating switch to control the secondary control circuit of the disconnector for closing verification. The disconnector opening verification module 242 is used to control the external interlocking circuit to meet the five-prevention closing conditions by operating the switch, and then uses the opening switch of the operating switch to control the secondary control circuit of the disconnector for opening verification. The anomaly verification module 243 is used to perform anomaly verification by detecting the voltage at the connection terminal in the secondary control circuit of the disconnector and the operating status of the actuator in the secondary control circuit of the disconnector, based on the abnormality of the operating switch.

[0063] It should be noted that this 110kV disconnector secondary circuit training demonstration device, through the cooperation of four areas—functional verification area 24, operation area 23, electrical diagram display area 21, and device display area 22—can accurately simulate the secondary circuit during disconnector opening and closing operations and display it to learners, providing an intuitive training effect. Furthermore, through the disconnector closing verification module 241, disconnector opening verification module 242, and anomaly verification module 243 in the functional verification area, after manually setting fault defects, the cooperation between the operation area 23, electrical diagram display area 21, and device display area 22 enables fault point troubleshooting training.

[0064] The 110kV disconnector secondary circuit training and demonstration device provided by this invention includes a movable support and a demonstration board. The demonstration board is equipped with an electrical diagram display area, a component display area, an operation area, and a function verification area. The function verification area is equipped with a disconnector closing verification module, a disconnector opening verification module, and an anomaly verification module. The electrical diagram display area is equipped with a disconnector secondary control circuit and an external interlocking circuit. The operation area is equipped with an operation switch for controlling the operation of the disconnector secondary control circuit and the external interlocking circuit. This 110kV disconnector secondary circuit training and demonstration device, through its electrical diagram display area, component display area, operation area, and function verification area, can display the switches and operating components required for disconnector opening and closing operations on the same plane. Combined with the synchronous analysis of the disconnector secondary control circuit and external interlocking circuit displayed in the electrical diagram display area, it can accurately simulate the secondary circuit in disconnector opening and closing operations and demonstrate it to learners, providing an intuitive training effect. Furthermore, through the disconnector closing verification module, disconnector opening verification module, and anomaly verification module in the function verification area, after manually setting fault defects, the training on fault point diagnosis can be carried out through the cooperation between the operation area, electrical diagram display area, and component display area, enhancing the training effect. This solves the technical problem of existing training on the secondary control circuit knowledge of disconnectors in substation primary equipment, which cannot demonstrate the wiring of substation secondary circuits and has poor training effect.

[0065] In one embodiment of the present invention, the five-proof tripping conditions are as follows: the tripping microswitch SL2 of the control tripping and closing limit switch is thrown to the tripping position and its normally closed contact is open; the normally closed contact of the closing microswitch SL1 of the control tripping and closing limit switch is closed; the switches of the first circuit breaker 1DL, the first grounding switch 01G, the second grounding switch 04G1 and the third grounding switch 04G2 are all thrown to the tripping position to make the external interlocking circuit open; the power supply air switch QF, the motor protection switch GDH and the overload protection switch KT are all opened, the transfer switch QC is grounded, and the interlocking switch SL3 is thrown to the motor position.

[0066] The closing verification using the secondary control circuit of the closing switch SB1, which operates the switch, includes:

[0067] The closing switch SB1, which operates the switch, performs a closing operation on the secondary control circuit of the disconnector. If the opening coil KM2 of the secondary control circuit of the disconnector is not energized, the closing coil KM1 is energized, and the actuator 8M rotates in the forward direction;

[0068] The closing microswitch SL1, which controls the opening and closing limit switches, is moved to the closing position and its normally closed contact is opened. If the closing circuit of the secondary control circuit of the disconnector is de-energized, the closing coil KM1 is not energized, and the actuator 8M stops working, the closing verification of the secondary control circuit of the disconnector is completed.

[0069] It should be noted that when the disconnector closing verification module 241 is in the five-proof tripping condition, it indicates that the closing circuit of the motor circuit in the secondary control circuit of the disconnector is normal and waiting to close. When the closing switch SB1 is started, the tripping coil KM2 is not energized, and the normally closed contact of the contactor corresponding to the tripping coil KM2 is closed. Therefore, the closing coil KM1 is energized, and the three pairs of contacts of the contactor corresponding to the closing coil KM1 in the motor circuit are closed, and the actuator (such as a three-phase motor) 8M rotates forward. When the 4G disconnector is closed to the position, the closing micro switch SL1 is switched to the closed position. At this time, the normally closed contact of the closing micro switch SL1 in the closing circuit of the motor circuit in the secondary control circuit of the disconnector is opened, the closing circuit is de-energized, the three pairs of contacts of the contactor corresponding to the closing coil KM1 are opened, the actuator (such as a three-phase motor) 8M stops, and the closing circuit verification is completed.

[0070] In one embodiment of the present invention, the five-proof closing conditions are as follows: the closing microswitch SL2 of the control opening and closing limit switch is thrown to the closing position and its normally closed contact is open; the opening microswitch SL1 of the control opening and closing limit switch is thrown to the opening position and its normally closed contact is closed; the switches of the first circuit breaker 1DL, the first grounding switch 01G, the second grounding switch 04G1 and the third grounding switch 04G2 are controlled to be thrown to the opening position, so that the external interlocking circuit is connected; the power air switch QF, the motor protection switch GDH and the overload protection switch KT are all opened, the transfer switch QC is grounded, and the interlocking switch SL3 is thrown to the motor position.

[0071] The tripping verification using the secondary control circuit of the tripping switch SB1, which controls the disconnector, includes:

[0072] The trip switch of the operating switch is used to trip the secondary control circuit of the disconnector. If the closing coil of the secondary control circuit of the disconnector is not energized, the tripping coil is energized, and the actuator reverses.

[0073] The microswitch controlling the opening and closing limit switches is moved to the opening position and its normally closed contact is opened. If the opening circuit of the secondary control circuit of the disconnector is de-energized, the opening coil is not energized, and the actuator stops working, the opening verification of the secondary control circuit of the disconnector is completed.

[0074] It should be noted that when the disconnector tripping verification module 242 is under the five-proof closing condition, it indicates that the tripping circuit of the motor circuit in the disconnector's secondary control circuit is normal and waiting to trip. When the tripping switch SB3 is started, the closing coil KM1 in the disconnector's secondary control circuit is not energized, and the normally closed contact of the contactor corresponding to the closing coil KM1 is closed. Therefore, the tripping coil KM2 in the motor circuit in the disconnector's secondary control circuit is energized, and the three pairs of contacts of the contactor corresponding to the tripping coil KM2 in the motor circuit are closed. The actuator (such as a three-phase motor) 8M reverses. When the 4G disconnector is closed to the position, the tripping microswitch SL2 is switched to the closed position. At this time, the normally closed contact of the tripping microswitch SL2 in the tripping circuit of the motor circuit is opened, the tripping circuit is de-energized, the three pairs of contacts of the contactor corresponding to the tripping coil KM2 are opened, the actuator (such as a three-phase motor) 8M stops, and the tripping circuit verification is completed.

[0075] like Figure 2 and Figure 3 As shown, in one embodiment of the present invention, the anomaly verification, based on the abnormality of the operating switch, includes detecting the voltage at the connection terminal in the secondary control circuit of the disconnector and the operating status of the actuator in the secondary control circuit of the disconnector:

[0076] Obtain the first voltage to ground at the first measuring connection terminal XT1:6, the second voltage to ground at the opening connection terminal SB3:23, and the third voltage to ground at the closing connection terminal SB1:23 in the secondary control circuit of the disconnector. If the first voltage is 220V and the second voltage is 0V or the third voltage is 0V, then the secondary control circuit of the disconnector is in an abnormal state where the changeover switch is not switched and its normally closed contact is not closed.

[0077] Obtain the fourth voltage of the second measuring connection terminal XT1:21 to the live wire and the fifth voltage of the interlock switch to the live wire in the secondary control circuit of the disconnector. If the fourth voltage is 220V and the fifth voltage is not 220V, the secondary control circuit of the disconnector is in an abnormal state where the interlock switch is not switched and its normally closed contact is not closed.

[0078] When the motor protection switch GDH and the overload protection switch KT are working, if the closing coil KM1 or the opening coil KM2 in the secondary control circuit of the disconnect switch loses power, the secondary control circuit of the disconnect switch will be in an abnormal state in which the actuator cannot work.

[0079] In one embodiment of the present invention, the anomaly verification module 243 is further configured to obtain the sixth voltage of the third measuring connection terminal XT1:17 to the live wire and the seventh voltage of the fourth measuring connection terminal XT1:16 to the live wire in the secondary control circuit of the disconnector, based on whether the first circuit breaker 1DL, the first grounding switch 01G, the second grounding switch 04G1 or the third grounding switch 04G2 is in the closed state; if the sixth voltage is 220V and the seventh voltage is not 220V, then the external blocking circuit is in an abnormal state of being disconnected.

[0080] It should be noted that the anomaly verification module 243 also measures the voltage across the overload protection switch KT, the motor protection switch GDH, and the stop switch SB2. If the measured voltage is not 220V, then the overload protection switch KT, the motor protection switch GDH, or the stop switch SB2 is in an abnormal state.

[0081] like Figure 4 As shown, in one embodiment of the present invention, the 110kV disconnector secondary circuit training demonstration device includes a drive display module, which is used to drive the operation of the display element LED. Display elements are installed at the connection points of various devices in the disconnector secondary control circuit and the external interlocking circuit. The display elements are used to monitor the operation status of the disconnector secondary control circuit and the external interlocking circuit in real time. The drive display module includes a microprocessor and a display drive submodule and a signal transmission submodule connected to the microprocessor. The microprocessor is used to output electrical signals to control the operation of the display elements, and the display drive submodule and the signal transmission submodule are used to transmit the electrical signals to the display elements.

[0082] It should be noted that LED display elements are installed on the electrical diagram display area corresponding to the various connections of the secondary control circuit and external interlocking circuit of the disconnector. These LEDs monitor in real time whether components such as the opening and closing limit switches SL1 / SL2, the changeover switch QC, the air circuit breaker QF, the closing switch SB1, the opening switch SB3, the actuators, and the contactors are functioning correctly. For example, if the LED corresponding to a component displays a green indicator light, it means the component is functioning correctly, indicating that the contacts are closed, the coil is energized, or the corresponding circuit is conducting. If the LED displays a red indicator light, it means the component is not functioning correctly, indicating that the contacts are open, the coil is de-energized, or the corresponding circuit is not conducting. If the LED displays a flashing indicator light, it means that the component or its corresponding circuit is faulty. This 110kV disconnector secondary circuit training and demonstration device can clearly display the specific operating status of the secondary control circuit through its display elements.

[0083] In this embodiment of the invention, the voltage driving the display module is AC 220V converted to DC 5V, providing operating voltage to the microprocessor and all display components. The AC 220V to DC 5V conversion involves rectification, step-down, regulation, and filtering to output DC 5V, which is then transmitted to the microprocessor as a switching signal.

[0084] It should be noted that the drive display module converts four channels of AC 220V voltage / six channels of DC 220V voltage into DC 5V voltage through rectification, step-down, regulation, and filtering via an external power input port. This voltage is then sent to the microprocessor, and the display driver submodule transmits the electrical signals to the LED control ports connected to the display elements to achieve signal display. Simultaneously, the signal transmission submodule can transmit switching signals to the microprocessor for display element control. In this embodiment, the drive display module can also directly control all display elements through programming code, greatly simplifying the number of components in the secondary control circuit of the switch. The voltage of the secondary control circuit of the switch all uses 220V AC mains input, ensuring high compatibility with external power supplies. The display elements use AC 220V to DC 5V voltage, providing operating voltage to the microprocessor and all LED indicator lights, and also providing power for the switching signal conversion of the components. The display driver submodule applies the microprocessor's electrical signals to the LED control port, thereby achieving precise control of the display element. The signal transmission submodule removes noise, malfunctions, and errors from the electrical signals before connecting them to the microprocessor. This allows for precise capture of the control signals required by the secondary control circuit of the switch, enabling flexible control of the display element's on / off state.

[0085] In this embodiment of the invention, the 110kV disconnector secondary circuit training and demonstration device has display elements corresponding to the connection points of various components in the disconnector secondary control circuit and the external interlocking circuit. These display elements monitor whether there are conductive electrical signals at the connection points of each component in the disconnector secondary control circuit, providing a clear and intuitive display of the specific operating status of the disconnector secondary control circuit. This 110kV disconnector secondary circuit training and demonstration device, after comprehensively considering the current situation and actual needs of substation maintenance personnel, arranges the switches and operating components required for disconnector opening and closing operations in a planar layout. It uses a drive display module to install monitoring display elements at the connection points of each component in the disconnector secondary control circuit, thereby monitoring the conduction signal status at the circuit component connection points in real time. This greatly simplifies the number of components controlling the disconnector secondary control circuit, enables visual analysis of the disconnector secondary control circuit, and helps operators carry out equipment inspection and maintenance troubleshooting work in a timely and accurate manner. In addition, the demonstration board is movable, lightweight, and small in size thanks to its support frame. Combined with functional verification methods for various scenarios, it enables classroom-style training, saving training costs for operators, improving training quality and efficiency, and filling the gap in the current market for teaching demonstration devices for troubleshooting secondary circuit faults of disconnectors.

[0086] Example 2:

[0087] The present invention also provides a verification method for a 110kV disconnector secondary circuit training demonstration device, which is applied to the above-mentioned 110kV disconnector secondary circuit training demonstration device. The verification method includes the following steps:

[0088] The external interlocking circuit is controlled by operating the switch to meet the five-proof tripping conditions. Then, the closing switch of the operating switch is used to control the secondary control circuit of the knife switch for closing verification.

[0089] The external interlocking circuit is controlled by the operating switch to meet the five-proof closing conditions. Then, the opening switch of the operating switch is used to control the secondary control circuit of the knife switch for opening verification.

[0090] If the operating switch is abnormal, the abnormality is checked by detecting the voltage at the connection terminal in the secondary control circuit of the disconnect switch and the operation of the actuator in the secondary control circuit of the disconnect switch.

[0091] The five-proof tripping conditions are as follows: the tripping microswitch controlling the tripping and closing limit switches is thrown to the tripping position and its normally closed contact is open; the normally closed contact of the closing microswitch controlling the tripping and closing limit switches is closed; the switches controlling the first circuit breaker, the first grounding switch, the second grounding switch, and the third grounding switch are thrown to the tripping position, so that the external interlocking circuit is connected; the control power air switch, the motor protection switch, and the overload protection switch are all open; the transfer switch is grounded; and the interlocking switch is thrown to the electric position.

[0092] The five-proof closing conditions are as follows: the closing microswitch of the control limit switch is thrown to the closing position and its normally closed contact is open; the opening microswitch of the control limit switch is thrown to the opening position and its normally closed contact is closed; the switches of the first circuit breaker, the first grounding switch, the second grounding switch, and the third grounding switch are thrown to the opening position to make the external interlocking circuit conduct; the control air switch, the motor protection switch, and the overload protection switch are all open, the transfer switch is grounded, and the interlocking switch is thrown to the electric position.

[0093] In this embodiment of the invention, the closing verification using the closing switch of the operating switch to control the secondary control circuit of the disconnector includes:

[0094] The closing switch of the operating switch is used to close the secondary control circuit of the disconnector. If the opening coil of the secondary control circuit of the disconnector is not energized, the closing coil is energized, and the actuator rotates in the forward direction;

[0095] The closing microswitch of the control limit switch is moved to the closing position and its normally closed contact is opened. If the closing circuit of the secondary control circuit of the disconnector is de-energized, the closing coil is not energized, and the actuator stops working, the closing verification of the secondary control circuit of the disconnector is completed.

[0096] The tripping verification using the secondary control circuit of the tripping switch controlled by the operating switch includes:

[0097] The trip switch of the operating switch is used to trip the secondary control circuit of the disconnector. If the closing coil of the secondary control circuit of the disconnector is not energized, the tripping coil is energized, and the actuator reverses.

[0098] The opening microswitch of the control limit switch is moved to the opening position and its normally closed contact is opened. If the opening circuit of the secondary control circuit of the disconnector is de-energized, the opening coil is not energized and the actuator stops working, the opening verification of the secondary control circuit of the disconnector is completed.

[0099] If the operating switch is malfunctioning, the malfunction is checked by detecting the voltage at the connection terminals in the secondary control circuit of the disconnector and the operating status of the actuators in the secondary control circuit of the disconnector, including:

[0100] The first voltage at the first measuring connection terminal to ground, the second voltage at the opening connection terminal to ground, and the third voltage at the closing connection terminal to ground in the secondary control circuit of the disconnector are obtained. If the first voltage is 220V and the second voltage is 0V or the third voltage is 0V, then the secondary control circuit of the disconnector is in an abnormal state where the changeover switch is not switched and its normally closed contact is not closed.

[0101] Obtain the fourth voltage of the second measuring connection terminal to the live wire and the fifth voltage of the interlock switch to the live wire in the secondary control circuit of the disconnector. If the fourth voltage is 220V and the fifth voltage is not 220V, the secondary control circuit of the disconnector is in an abnormal state where the interlock switch is not switched and its normally closed contact is not closed.

[0102] When the motor protection switch and overload protection switch are working, if the closing coil or opening coil in the secondary control circuit of the disconnect switch loses power, the secondary control circuit of the disconnect switch will be in an abnormal state in which the actuator cannot work.

[0103] In this embodiment of the invention, the verification method of the 110kV disconnector secondary circuit training demonstration device includes: based on the first circuit breaker, the first grounding switch, the second grounding switch, or the third grounding switch being in the closed state, obtaining the sixth voltage of the third measuring connection terminal to the live wire and the seventh voltage of the fourth measuring connection terminal to the live wire in the disconnector secondary control circuit; if the sixth voltage is 220V and the seventh voltage is not 220V, then the external blocking circuit is in an abnormal state of being disconnected.

[0104] It should be noted that the content of the 110kV disconnector secondary circuit training demonstration device in Embodiment 2 has already been described in Embodiment 1, and the content of the 110kV disconnector secondary circuit training demonstration device will not be described again in this Embodiment 2.

[0105] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0106] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0107] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0108] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0109] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0110] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A 110 kV knife switch secondary circuit training demonstration device, comprising a movable support and a demonstration board installed on the support, characterized in that, The demonstration board is provided with an electrical diagram display area, a device display area, an operation area and a function verification area, the function verification area is provided with a knife switch closing verification module, a knife switch opening verification module and an abnormality verification module, the electrical diagram display area is provided with a knife switch secondary control loop and an external locking loop, and the operation area is provided with an operation switch for controlling the operation of the knife switch secondary control loop and the external locking loop; The knife switch closing verification module is used for controlling the external locking loop to meet the five-prevention opening condition through the operation switch, and then controlling the knife switch secondary control loop to perform closing verification through the closing switch of the operation switch; The knife switch opening verification module is used for controlling the external locking loop to meet the five-prevention closing condition through the operation switch, and then controlling the knife switch secondary control loop to perform opening verification through the opening switch of the operation switch; The abnormality verification module is used for performing abnormality verification by detecting the voltage of the connection end in the knife switch secondary control loop and the operation condition of the execution element in the knife switch secondary control loop when the operation switch is abnormal; The operation switch comprises an opening and closing stroke switch, an interlocking switch, a motor protection switch, an overload prevention switch, a conversion switch, a power supply air switch, a closing switch and an opening switch, the external locking loop is provided with a first circuit breaker, a first ground knife, a second ground knife and a third ground knife connected in sequence, the second ground knife is further connected with a first connection end, and the third ground knife is further connected with a second connection end; The five-prevention opening condition is that the opening micro switch of the opening and closing stroke switch is thrown to the opening position and its normally closed contact is opened, the normally closed contact of the closing micro switch of the opening and closing stroke switch is closed, the switches of the first circuit breaker, the first ground knife, the second ground knife and the third ground knife are thrown to the opening position, the external locking loop is turned on, the power supply air switch, the motor protection switch and the overload prevention switch are all turned on, the conversion switch is grounded, and the switch of the interlocking switch is thrown to the electric position; The closing verification of the knife switch secondary control loop through the closing switch of the operation switch comprises: The closing switch of the operation switch is used for performing closing operation on the knife switch secondary control loop, if the opening coil of the knife switch secondary control loop cannot be electrified, the closing coil is electrified and the execution element is positively rotated; The closing micro switch of the opening and closing stroke switch is controlled to the closing position and its normally closed contact is opened, if the closing loop of the knife switch secondary control loop loses electricity, the closing coil cannot be electrified and the execution element stops working, and the closing verification of the knife switch secondary control loop is completed.

2. The 110 kV knife switch secondary circuit training demonstration device according to claim 1, characterized in that, The five-prevention closing conditions are that: the closing microswitch of the opening and closing stroke switch is thrown to the closing position and its normally closed contact is opened, the opening microswitch of the opening and closing stroke switch is thrown to the opening position and its normally closed contact is closed; the switches of the first circuit breaker, the first ground knife, the second ground knife and the third ground knife are thrown to the opening position, so that the external locking loop is conducted; the power supply air switch, the motor protection switch and the overload protection switch are all turned on, the transfer switch is grounded, and the switch of the interlocking switch is thrown to the electric position; The opening switch of the operation switch is used to control the opening and closing verification of the knife switch secondary control loop, which comprises: The opening switch of the operation switch is used to control the opening and closing verification of the knife switch secondary control loop, which comprises: The opening microswitch of the opening and closing stroke switch is thrown to the opening position and its normally closed contact is opened, and if the opening circuit of the knife switch secondary control loop loses power, the closing coil loses power and the execution element stops working, the opening and closing verification of the knife switch secondary control loop is completed.

3. The 110 kV knife switch secondary circuit training demonstration device of claim 1, wherein, According to the abnormality of the operation switch, the abnormality verification is performed by detecting the voltage of the connection end in the knife switch secondary control loop and the running condition of the execution element in the knife switch secondary control loop, which comprises: The first voltage of the first measurement connection end to ground, the second voltage of the opening connection end to ground and the third voltage of the closing connection end to ground in the knife switch secondary control loop are obtained, and if the first voltage is 220V and the second voltage is 0V or the third voltage is 0V, the knife switch secondary control loop is in an abnormal state that the transfer switch cannot be switched to the position and its normally closed contact is not closed; The fourth voltage of the second measurement connection end to the live wire and the fifth voltage of the interlocking switch to the live wire are obtained, and if the fourth voltage is 220V and the fifth voltage is not 220V, the knife switch secondary control loop is in an abnormal state that the interlocking switch cannot be switched to the position and its normally closed contact is not closed; When the motor protection switch and the overload protection switch work, if the closing coil or the opening coil of the knife switch secondary control loop loses power, the knife switch secondary control loop is in an abnormal state that the execution element cannot work.

4. The 110 kV knife switch secondary circuit training demonstration device of claim 1, wherein, The abnormality verification module is also used to obtain the sixth voltage of the third measurement connection end to the live wire and the seventh voltage of the fourth measurement connection end to the live wire in the knife switch secondary control loop according to the closing state of the first circuit breaker, the first ground knife, the second ground knife or the third ground knife; if the sixth voltage is 220V and the seventh voltage is not 220V, the external locking loop is in an abnormal state of being disconnected.

5. The 110 kV knife switch secondary circuit training demonstration device of claim 1, wherein, The application relates to a display module driving device, which is used for driving display elements, the display elements are installed on each device connection of a knife switch secondary control circuit and an external locking circuit, and the display elements are used for monitoring the operation conditions of the knife switch secondary control circuit and the external locking circuit in real time; the display module driving device comprises a microprocessor, a display driving submodule and a signal transmission submodule connected with the microprocessor, the microprocessor is used for outputting electric signals for controlling the operation of the display elements, and the display driving submodule and the signal transmission submodule are used for transmitting the electric signals to the display elements.

6. A verification method of a 110 kV knife switch secondary circuit training demonstration device, characterized in that, The verification method is applied to the 110kV knife switch secondary circuit training demonstration device of any one of claims 1-5, and comprises the following steps: The closing switch of the operating switch is used to control the external locking circuit to meet the five-protection opening condition, and then the closing switch of the operating switch is used to control the knife switch secondary control circuit to perform the closing verification; The closing switch of the operating switch is used to control the external locking circuit to meet the five-protection closing condition, and then the opening switch of the operating switch is used to control the knife switch secondary control circuit to perform the opening verification; According to the abnormality of the operating switch, the voltage of the connection end in the knife switch secondary control circuit and the operation condition of the execution element in the knife switch secondary control circuit are detected to perform the abnormality verification; The five-protection opening condition is that the opening microswitch of the control opening and closing stroke switch is thrown to the opening position and the normally closed contact is opened, the normally closed contact of the closing microswitch of the control opening and closing stroke switch is closed, the switches of the first circuit breaker, the first ground knife, the second ground knife and the third ground knife are thrown to the opening position, and the external locking circuit is conducted; the power air switch, the motor protection switch and the anti-overload switch are all opened, the changeover switch is grounded, and the switch of the interlocking switch is thrown to the electric position; The five-protection closing condition is that the closing microswitch of the control opening and closing stroke switch is thrown to the closing position and the normally closed contact is opened, the opening microswitch of the control opening and closing stroke switch is thrown to the opening position and the normally closed contact is closed; the switches of the first circuit breaker, the first ground knife, the second ground knife and the third ground knife are thrown to the opening position, and the external locking circuit is conducted; the power air switch, the motor protection switch and the anti-overload switch are all opened, the changeover switch is grounded, and the switch of the interlocking switch is thrown to the electric position.

7. The method of claim 6, wherein the method further comprises: The closing switch of the operating switch is used to control the external locking circuit to meet the five-protection opening condition, and then the closing switch of the operating switch is used to control the knife switch secondary control circuit to perform the closing verification; The closing switch of the operating switch is used to control the external locking circuit to meet the five-protection closing condition, and then the opening switch of the operating switch is used to control the knife switch secondary control circuit to perform the opening verification; According to the abnormality of the operating switch, the voltage of the connection end in the knife switch secondary control circuit and the operation condition of the execution element in the knife switch secondary control circuit are detected to perform the abnormality verification; The five-protection opening condition is that the opening microswitch of the control opening and closing stroke switch is thrown to the opening position and the normally closed contact is opened, the normally closed contact of the closing microswitch of the control opening and closing stroke switch is closed, the switches of the first circuit breaker, the first ground knife, the second ground knife and the third ground knife are thrown to the opening position, and the external locking circuit is conducted; the power air switch, the motor protection switch and the anti-overload switch are all opened, the changeover switch is grounded, and the switch of the interlocking switch is thrown to the electric position; The five-protection closing condition is that the closing microswitch of the control opening and closing stroke switch is thrown to the closing position and the normally closed contact is opened, the opening microswitch of the control opening and closing stroke switch is thrown to the opening position and the normally closed contact is closed; the switches of the first circuit breaker, the first ground knife, the second ground knife and the third ground knife are thrown to the opening position, and the external locking circuit is conducted; the power air switch, the motor protection switch and the anti-overload switch are all opened, the changeover switch is grounded, and the switch of the interlocking switch is thrown to the electric position. The closing switch of the operating switch is used to control the external locking circuit to meet the five-protection opening condition, and then the closing switch of the operating switch is used to control the knife switch secondary control circuit to perform the closing verification; The closing switch of the operating switch is used to control the external locking circuit to meet the five-protection closing condition, and then the opening switch of the operating switch is used to control the knife switch secondary control circuit to perform the opening verification; According to the abnormality of the operating switch, the voltage of the connection end in the knife switch secondary control circuit and the operation condition of the execution element in the knife switch secondary control circuit are detected to perform the abnormality verification; The five-protection opening condition is that the opening microswitch of the control opening and closing stroke switch is thrown to the opening position and the normally closed contact is opened, the normally closed contact of the closing microswitch of the control opening and closing stroke switch is closed, the switches of the first circuit breaker, the first ground knife, the second ground knife and the third ground knife are thrown to the opening position, and the external locking circuit is conducted; the power air switch, the motor protection switch and the anti-overload switch are all opened, the changeover switch is grounded, and the switch of the interlocking switch is thrown to the electric position; The five-protection closing condition is that the closing microswitch of the control opening and closing stroke switch is thrown to the closing position and the normally closed contact is opened, the opening microswitch of the control opening and closing stroke switch is thrown to the opening position and the normally closed contact is closed; the switches of the first circuit breaker, the first ground knife, the second ground knife and the third ground knife are thrown to the opening position, and the external locking circuit is conducted; the power air switch, the motor protection switch and the anti-overload switch are all opened, the changeover switch is grounded, and the switch of the interlocking switch is thrown to the electric position. The opening switch of the operating switch is used to open the secondary control circuit of the knife switch, and if the closing coil of the secondary control circuit of the knife switch is not powered, the opening coil is powered, and the execution element is reversed; The opening micro switch of the opening and closing travel switch is controlled to the opening position, and the normally closed contact is opened, if the opening circuit of the secondary control circuit of the knife switch loses power, the opening coil is not powered, and the execution element stops working, the opening verification of the secondary control circuit of the knife switch is completed; According to the abnormality of the operating switch, the abnormality verification is performed by detecting the voltage of the connection end in the secondary control circuit of the knife switch and the running state of the execution element in the secondary control circuit of the knife switch, including: The first voltage of the first measurement connection end to ground, the second voltage of the opening connection end to ground, and the third voltage of the closing connection end to ground in the secondary control circuit of the knife switch are obtained, if the first voltage is 220V and the second voltage is 0V or the third voltage is 0V, the secondary control circuit of the knife switch is in an abnormal state that the switching of the changeover switch is not in place and the normally closed contact is not closed; The fourth voltage of the second measurement connection end to the live wire and the fifth voltage of the interlocking switch to the live wire in the secondary control circuit of the knife switch are obtained, if the fourth voltage is 220V and the fifth voltage is not 220V, the secondary control circuit of the knife switch is in an abnormal state that the switching of the interlocking switch is not in place and the normally closed contact is not closed; When the motor protection switch and the overload protection switch work, if the closing coil or the opening coil in the secondary control circuit of the knife switch loses power, the secondary control circuit of the knife switch is in an abnormal state that the execution element cannot work.

8. The method of claim 6, wherein the method further comprises: Including: According to the closing state of the first circuit breaker, the first ground knife, the second ground knife or the third ground knife, the sixth voltage of the third measurement connection end to the live wire and the seventh voltage of the fourth measurement connection end to the live wire in the secondary control circuit of the knife switch are obtained, if the sixth voltage is 220V and the seventh voltage is not 220V, the external locking circuit is in an abnormal state of being disconnected.

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