Interlocking device of integrated disconnecting switch and circuit breaker

Abstract

The utility model belongs to the technical field of high-voltage switch equipment of an electric power system, and particularly relates to an interlocking device of an integrated isolating switch and a circuit breaker, which adopts components such as a sliding block, a baffle plate and an interlocking rod, and adopts physical blocking to directly prohibit illegal operation; dynamic locking of an operation state is realized through linkage parts such as a connecting rod and a cam shaft; auxiliary contacts of a circuit breaker and an isolating switch are connected in series or in parallel to be connected into a control loop, multi-condition verification is achieved, and a locking instruction is output by integrating sensor signals through an integrated logic judgment module. Through mechanical and electrical double locking, safety logics such as mistaken opening and closing prevention and electrified grounding wire hanging prevention are forcibly realized, mechanical parts are integrated in the circuit breaker and the isolating switch, the installation space is saved, the mechanical design is optimized, abrasion is reduced, and the reliability is improved through electrical logic verification.

Description

Technical Field

[0001] This utility model belongs to the technical field of high-voltage switchgear in power systems, and particularly relates to an interlocking device for an integrated disconnector and circuit breaker. Background Technology

[0002] In the field of power equipment, ring main units (RMMs) come in various forms and structures. Since RMMs are generally connected to external power transmission lines and operate at high voltages, maintenance requires disconnecting the circuit breaker and disconnecting the power supply before closing the grounding switch to ensure the safety of maintenance personnel and equipment. To prevent misoperation of circuit breakers, disconnecting switches, and grounding switches, designers have devised various anti-misoperation mechanisms. However, current anti-misoperation mechanisms are complex in structure, have low reliability, and are inconvenient to install and maintain. Nevertheless, during maintenance, some workers have experienced safety accidents due to misoperation. For example, after the RMM circuit breaker is disconnected, workers may close the grounding switch before opening the disconnecting switch; or after maintenance, workers may close the disconnecting switch before opening the grounding switch.

[0003] Traditional interlocking devices rely on independent mechanical structures, which are bulky and difficult to install, leading to an increase in the overall size of the equipment. Mechanical parts are prone to interlocking failure due to long-term wear, posing a risk of misoperation and resulting in high maintenance costs. The interlocking devices have low integration with the equipment, and the operation steps are cumbersome, affecting work efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide an interlocking device for an integrated disconnector and circuit breaker that can simplify the operation process, reduce the failure rate and improve safety.

[0005] To solve the above-mentioned technical problems, the specific technical solution of this utility model is as follows:

[0006] In some embodiments of this application, an interlocking device for an integrated disconnector and circuit breaker is provided, including a mechanical interlocking module and an electrical interlocking module;

[0007] The mechanical interlock module includes:

[0008] The closing electromagnet bend plate is installed on the circuit breaker operating mechanism;

[0009] The circuit breaker locking slider has a central groove that engages with the bending plate of the closing electromagnet.

[0010] A manual or electric baffle is slidably mounted on the control panel and covers the operating holes of the disconnect switch and / or grounding switch;

[0011] The trip button is connected to the lower door interlock rod, and a trip button is provided on the operation panel;

[0012] The grounding interlock plate and the three-position indicator are connected to the disconnecting switch mechanism via springs;

[0013] The electrical interlocking module includes:

[0014] The circuit breaker auxiliary switch is connected to the operating circuits of the disconnecting switch and the grounding switch, respectively.

[0015] Three-position auxiliary switches, energy storage auxiliary switches, and lower door interlocking auxiliary switches are connected in series or in parallel to the closing or opening circuit;

[0016] The MCU control box is used to receive signals from the auxiliary limit switches of the disconnecting switch and the auxiliary limit switches of the grounding switch, and to output a lockout command.

[0017] In some embodiments of this application, baffles are provided at both ends of the circuit breaker locking slider.

[0018] In some embodiments of this application, the three-position indicator is provided with a groove and a stud is provided on the manual / electric baffle. When the grounding switch is closed, the groove is aligned with the stud on the manual / electric baffle.

[0019] In some embodiments of this application, the lower door interlocking rod and the grounding interlocking plate are connected by a spring; the grounding interlocking plate blocks the upward path of the lower door interlocking rod when the isolating switch is in the closed or open position, and the interlocking rod can be lifted to unlock the lower door only when the three-position indicator is in the grounded position.

[0020] In some embodiments of this application, the MCU control box receives a signal from the auxiliary limit switch of the grounding switch; when the grounding switch is closed, the MCU control box outputs a blocking signal to the disconnecting switch operating circuit to prohibit power supply operation.

[0021] In some embodiments of this application, the mechanical interlocking module and the electrical interlocking module are integrated inside the operating mechanism of the ring main unit or circuit breaker.

[0022] In some embodiments of this application, the interlocking device is used in ring main units, circuit breakers, and disconnecting switchgear in medium and high voltage power systems.

[0023] Compared with existing technologies, the advantages of this utility model are as follows: by employing components such as sliders, baffles, and interlocking rods, illegal operations are directly prohibited through physical blocking; dynamic interlocking of the operating state is achieved through linkage components such as connecting rods and camshafts; multiple condition verifications are achieved by connecting the auxiliary contacts of circuit breakers and disconnectors in series or parallel to the control circuit; and interlocking commands are output by integrating sensor signals through an integrated logic judgment module. Through dual mechanical and electrical interlocking, safety logic such as preventing accidental opening and closing and preventing live grounding is enforced. The mechanical components are integrated inside the circuit breaker and disconnector, saving installation space, optimizing mechanical design to reduce wear, and improving reliability through electrical logic verification. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0025] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0026] Figure 2 A schematic diagram of the mechanical interlocking module structure provided in this embodiment of the utility model;

[0027] Figure 3 This is a schematic diagram of the electrical interlocking module structure provided in an embodiment of the present utility model. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0029] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.

[0030] See appendix Figure 1-3 As shown, some embodiments of this application include a mechanical interlocking module and an electrical interlocking module;

[0031] The mechanical interlock module includes:

[0032] The closing electromagnet bend plate 1 is installed on the circuit breaker operating mechanism;

[0033] The circuit breaker locking slider 2 has a central groove and engages with the closing electromagnet bent plate 1.

[0034] The manual / electric baffle 3 is slidably mounted on the control panel and covers the operating holes of the isolating switch and / or grounding switch;

[0035] The trip button baffle 4 is connected to the lower door interlock rod 8, and a trip button is provided on the operation panel;

[0036] The grounding interlock plate 6 and the three-position indicator are connected to the disconnecting switch mechanism via springs;

[0037] The electrical interlocking module includes:

[0038] The circuit breaker auxiliary switch 14 is connected to the operating circuits of the disconnecting switch and the grounding switch, respectively.

[0039] Three-position auxiliary switch, energy storage auxiliary switch 12, and lower door interlocking auxiliary switch 13 are connected in series or in parallel to the closing or opening circuit.

[0040] The MCU control box is used to receive signals from the disconnector auxiliary limit switch 10 and the grounding switch auxiliary limit switch 11, and output a lockout command.

[0041] The mechanical interlocking module and the electrical interlocking module work together to achieve the following functions:

[0042] Prevent opening or closing disconnecting switches under load, prevent accidental opening or closing of circuit breakers, prevent connecting grounding wires while energized, prevent energizing with grounding wires connected, and prevent accidental entry into energized compartments.

[0043] The circuit breaker locking slider 2 is provided with baffles at both ends; when the closing electromagnet bent plate 1 is inserted into the middle groove, the baffles block the movement path of the manual electric baffle 3.

[0044] The three-position indicator 7 has a groove; when the grounding switch is closed, the groove is aligned with the stud on the manual electric baffle 3, restricting the manual electric baffle 3 from moving to the disconnecting switch operating position.

[0045] The lower door interlock rod 8 is connected to the grounding interlock plate 6 by a spring; the grounding interlock plate 6 blocks the upward path of the lower door interlock rod 8 when the isolating switch is in the closed or open position, and the interlock rod can be lifted to unlock the lower door only when the three-position indicator is in the grounded position.

[0046] The closing circuit of the electrical interlocking module includes the following contacts connected in series: the normally closed contact of the manual / electric damper auxiliary switch (three-position auxiliary switch); the normally closed auxiliary contact of the circuit breaker (circuit breaker auxiliary switch); the normally open auxiliary contact of the energy storage (energy storage auxiliary switch); when any contact is open, the closing circuit is cut off.

[0047] The tripping circuit includes the following contacts connected in series: a normally closed auxiliary contact for the lower door interlock (lower door interlock auxiliary switch); a normally open auxiliary contact for the circuit breaker (circuit breaker auxiliary switch); the tripping circuit is interrupted when the lower door is opened or the circuit breaker is tripped.

[0048] The MCU control box receives the signal from the auxiliary limit switch 11 of the grounding switch; when the grounding switch is closed, the MCU control box outputs a lockout signal to the disconnecting switch operation circuit to prohibit power supply operation.

[0049] The lower door electromagnetic lock is energized and locked when the equipment is energized; it is only unlocked when the equipment is completely de-energized and grounded, allowing the lower door to be opened.

[0050] Mechanical interlocks directly restrict unauthorized operations through the rigid locking and linkage design of physical components. The following is a breakdown of the specific steps involved in a mechanical interlock:

[0051] Preventing the opening and closing of disconnect switches under load

[0052] Step 1: When the circuit breaker is closed, the closing electromagnet bent plate 1 is engaged in the middle groove of the circuit breaker locking slider 2.

[0053] Step 2: After the circuit breaker locking slider 2 is fixed, its two side baffles will block the movement path of the manual electric baffle 3.

[0054] Step 3: The manual / electric baffle 3 cannot be moved, which physically locks the operating hole of the disconnect switch, making it impossible to perform opening and closing operations.

[0055] Preventing accidental opening and closing of circuit breakers

[0056] Prevents accidental closing (manual operation)

[0057] Step 1: When the manual electric baffle 3 is in the grounding or isolation operation hole position, its baffle will cover the closing operation hole.

[0058] Step 2: At this time, both ends of the circuit breaker locking slider 2 will block the closing electromagnet bent plate 1 below, preventing it from being pressed down.

[0059] Step 3: The closing operation lever is physically blocked, making it impossible to manually close the circuit.

[0060] Prevents accidental tripping (when the lower door is open)

[0061] Step 1: When the lower door is opened, the trip button baffle 4 is pushed below the trip button by the linkage mechanism.

[0062] Step 2: The baffle directly blocks the trip button, preventing it from being pressed and thus stopping the tripping operation.

[0063] Prevent the grounding wire from being connected to a live circuit (close the grounding switch).

[0064] Step 1: When the circuit breaker is closed, the closing electromagnet bend plate 1 engages with the locking slider, locking the manual / electric baffle 3.

[0065] Step 2: When the disconnect switch is in the closed position, the three-position indicator 7 will block the movement path of the grounding interlock plate 6.

[0066] Step 3: The grounding interlock plate 6 cannot slide, causing the grounding switch operating hole to be locked, preventing the circuit breaker from closing and grounding.

[0067] Preventing power supply with grounding wire

[0068] Step 1: When the grounding switch is closed, the groove of the three-position indicator 7 is aligned with the stud on the manual electric baffle 3.

[0069] Step 2: The manual electric baffle 3 is restricted to the grounding operation position and cannot be moved to the right to the disconnect switch operation hole.

[0070] Step 3: The operating hole of the disconnect switch is physically locked, and power supply cannot be performed.

[0071] Prevent accidental entry into energized compartments (lower door interlock)

[0072] Step 1: When the equipment is energized, the lower door interlock rod 8 is linked to the grounding interlock plate 6 via a spring.

[0073] Step 2: When the disconnector or circuit breaker is in the closed position, the grounding interlock plate 6 blocks the upward path of the lower door interlock rod 8.

[0074] Step 3: Only when the equipment is grounded (the three-position indicator is in the grounded position) can the interlocking rod be lifted to unlock the lower door.

[0075] Step 4: After the lower door is opened, the circuit breaker lower door interlock 9 will further lock the tripping operation, forming double protection.

[0076] Unauthorized operations are directly prohibited by physical barriers, without relying on electrical signals. Components are linked by sliders, baffles, interlocking rods, etc., to ensure that the operation logic is forced to take effect. The lower door interlock is equipped with multiple locking mechanisms to improve safety. The mechanical structure is simple and durable, with a low failure rate and convenient maintenance.

[0077] Electrical interlocking, through the coordinated control of logic circuits and sensor signals, ensures that operation meets the "five-proof" safety conditions. The following are the electrical interlocking steps for each function:

[0078] Preventing the opening and closing of disconnect switches under load

[0079] Step 1: When the circuit breaker is closed, its normally closed auxiliary contact (NC contact) opens.

[0080] Step 2: The three-position operation switch circuit is cut off, and the operation of the isolating switch is logically blocked.

[0081] Among them, the normally closed auxiliary contact of the circuit breaker (auxiliary switch of the circuit breaker): monitors the status of the circuit breaker, opens when the circuit is closed, and disconnects the operating circuit of the isolating switch.

[0082] Preventing accidental opening and closing of circuit breakers

[0083] Preventing accidental closing:

[0084] Step 1: Manual electric baffle auxiliary switch (normally closed contact): When the manual electric baffle 3 blocks the operating hole, the contact is open.

[0085] Step 2: Circuit breaker normally closed auxiliary contact (circuit breaker auxiliary switch): Closes when the circuit breaker is tripped.

[0086] Step 3: Energy storage normally open auxiliary contact (energy storage auxiliary switch): Closes after energy storage is completed.

[0087] Step 4: The above contacts are connected in series to the closing circuit. If any condition is not met (such as the manual electric baffle 3 not being reset, the circuit breaker not being opened, or energy storage not being completed), the closing circuit will be disconnected.

[0088] Preventing accidental tripping:

[0089] Step 1: Lower door interlock normally closed auxiliary contact (lower door interlock auxiliary switch): Closes when the lower door is closed, allowing tripping operation.

[0090] Step 2: Circuit breaker normally open auxiliary contact (circuit breaker auxiliary switch) (NO contact): Closes when the circuit breaker is closed.

[0091] Step 3: The above contacts are connected in series to the tripping circuit. When the lower door is opened or the circuit breaker is tripped, the tripping circuit is disconnected.

[0092] Among them, the manual and electric baffle auxiliary switch monitors the baffle position and locks non-compliant closing operations; the energy storage auxiliary contact ensures that energy storage is completed before closing; and the lower door interlock auxiliary contact prevents the circuit breaker from tripping when the lower door is not closed.

[0093] Prevent the grounding wire from being connected to a live circuit (close the grounding switch).

[0094] Step 1: When the circuit breaker is closed, its normally open auxiliary contact (NO contact) closes, sending a lockout signal to the three-position operating circuit.

[0095] Step 2: Auxiliary travel switch 10 of the isolating switch: When the isolating switch is closed, it sends a signal to lock the grounding switch operation circuit.

[0096] Among them, the normally open auxiliary contact of the circuit breaker (auxiliary switch of the circuit breaker) monitors the status of the circuit breaker and blocks the grounding operation when closing; the auxiliary limit switch 10 of the disconnecting switch detects the position of the disconnecting switch and blocks the grounding circuit.

[0097] Preventing power supply with grounding wire

[0098] Step 1: Grounding switch auxiliary limit switch 11: When the grounding switch is closed, a signal is sent to the MCU control box.

[0099] Step 2: MCU control box: Determines the grounding status and outputs a blocking signal to the disconnect switch operation circuit.

[0100] Among them, the grounding switch auxiliary limit switch 11 detects the grounding switch status, the MCU control box integrates logic judgment, and locks the power supply operation of the isolating switch.

[0101] Preventing accidental entry into energized compartments

[0102] Step 1: When the equipment is powered on, the lower door electromagnetic lock is energized and the lower door is locked.

[0103] Step 2: The electromagnetic lock will only unlock after the equipment is completely powered off and grounded, allowing the lower door to be opened.

[0104] During the process, the lower door electromagnetic lock controls the physical locking of the lower door through electrical signals to prevent accidental entry into a live area.

[0105] Multi-condition verification (such as AND and OR logic) is achieved through series / parallel contacts. Sensors and auxiliary contacts provide real-time feedback on equipment status to ensure operational safety. Redundancy design complements mechanical interlocking, so that the other system can still provide protection if one system fails. Programmable logic is supported by MCU to adapt to different operating conditions. Electrical interlocking comprehensively covers the "five protections" function with strict logic control, significantly improving the safety and reliability of power equipment operation.

[0106] Assuming the switch is in the grounded state at this time, a power supply operation needs to be performed.

[0107] The circuit breaker is tripped. At this time, the closing electromagnet's bent plate 1 is locked between the circuit breaker's interlocking slider 2, thus locking the manual / electric baffle 3. The three-position switch cannot be operated at this time. If the lower door is open, because the lower door is not pressing down on the interlocking rod, the trip button baffle 4 will block the trip button, preventing it from being pressed. If the lower door is closed, only the circuit breaker can be tripped. Press the trip button to trip the circuit breaker.

[0108] Disconnect the grounding switch. After the circuit breaker, the drive shaft 17 rotates, causing the lower door interlock 9 of the circuit breaker to rotate downwards, blocking the lower door interlock rod 8, preventing the slider from moving upwards and thus preventing the lower door from opening. At this time, due to the special shape of the mounting pin on the manual electric baffle 3 and the three-position indicator 7, the manual electric baffle 3 cannot continue to slide to the right and cannot expose the isolation operation hole. At this time, only the grounding switch can be operated. The slider moves to the right, inserting the handle to disconnect the grounding switch.

[0109] Close the isolating switch. After opening the grounding switch, the grounding interlock plate 6 moves to the left to block the lower door interlock rod 8 from rising. This adds an interlock to the lower door. The circuit breaker locking slider 2 is blocked under the closing electromagnet bent plate 1, preventing the circuit breaker from closing. The slider moves to the left, inserting the handle to close the isolating switch.

[0110] Close the circuit breaker. After closing the isolating switch, as mentioned above, the lower door is locked, the grounding switch operation is locked (at this time, due to the special shape of the mounting pin on the manual electric baffle 3 and the three-position indicator 7, the manual electric baffle 3 cannot continue to slide to the left and the grounding operation hole cannot be exposed), and the circuit breaker trip button is locked. Move the slider to the center and press the circuit breaker close button.

[0111] The switch is currently in operation, and a power outage and grounding operation must be performed.

[0112] The circuit breaker is open. At this time, the closing electromagnet's bent plate 1 is locked between the circuit breaker's interlocking slider 2, thus locking the manual / electric stop plate 3. The three-position switch cannot be operated at this time. With the lower door closed, only the circuit breaker can be operated. Press the opening button.

[0113] The disconnect switch is opened. After the circuit breaker is opened, the grounding interlock plate 6 moves to the left to block the lower door interlock rod 8 from lifting and locking the lower door. At this time, due to the special shape of the mounting pin on the manual electric baffle 3 and the three-position indicator 7, the manual electric baffle 3 cannot slide further to the left and the grounding operation hole cannot be exposed. The slider slides to the left and inserts the handle to open the disconnect switch.

[0114] Close the grounding switch. After opening the isolating switch, the lower door remains locked due to the special shape of the three-position indicator 7. At this point, the circuit breaker cannot be opened or closed due to the previously mentioned circuit breaker locking slider 2 and trip button stop plate 4. Move the slider to the left and insert the handle to close the grounding switch.

[0115] Close the circuit breaker. After closing the grounding switch, the lower door interlock 9 of the circuit breaker still blocks the lower door interlock rod 8, preventing the slider from moving upward and thus preventing the lower door from opening. Due to the special shape of the mounting pin and the three-position indicator 7 on the manual electric baffle 3, the manual electric baffle 3 cannot continue to slide to the right and cannot expose the isolation operation hole. Move the slider to the center and press the circuit breaker closing button.

[0116] At this time, the rotation of the drive shaft 17 drives the circuit breaker lower door interlock 9 to rotate upward and no longer lock the lower door interlock rod 8, so that the slider can move upward and open the lower door.

[0117] Electrical interlocking design:

[0118] The closing circuit is connected in series with a manual electric interlocking auxiliary switch, a circuit breaker auxiliary switch, and an energy storage auxiliary switch. The grounding auxiliary switch and the isolating auxiliary switch are connected in parallel and then connected in series to the closing circuit. This circuit ensures that the closing operation can only be performed when the manual electric baffle 3 is in the center position (i.e., the handle cannot be inserted) after energy storage is completed, and the circuit breaker is open, or one of the isolating or grounding switches is closed.

[0119] The tripping circuit is connected to the lower gate interlocking auxiliary and the circuit breaker auxiliary. Tripping can only be performed when the circuit breaker is closed and the lower gate is closed.

[0120] The isolating switch cannot be operated when the MCU control box is in the grounded state, and the grounding switch cannot be operated when the isolating switch is in the closed state. Isolation and grounding operations cannot be performed when the circuit breaker is closed. Furthermore, when the equipment is energized, the lower door electromagnetic lock is powered on and locks the lower door.

[0121] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0122] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0123] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0124] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0125] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An interlock device for an integrated isolator and circuit breaker, comprising: The mechanical interlocking module and the electrical interlocking module are included. The mechanical interlocking module includes: A closing electromagnet bent plate installed on the circuit breaker operating mechanism; A circuit breaker locking slider provided with an intermediate groove and engaged with the closing electromagnet bent plate; A hand motor baffle plate slidingly arranged on the operating panel and covering the operating hole of the disconnector and / or the grounding switch; A tripping button baffle plate connected with the lower door interlocking rod and provided with a tripping button on the operating panel; A grounding interlocking plate and a three-position indicator connected with the disconnector mechanism through a spring; The electrical interlocking module includes: A circuit breaker auxiliary switch connected with the disconnector and the grounding switch operating circuit respectively; A three-position auxiliary switch, an energy storage auxiliary switch and a lower door interlocking auxiliary switch connected in series or parallel with the closing or tripping circuit; An MCU control box for receiving signals of the disconnector auxiliary travel switch and the grounding switch auxiliary travel switch and outputting locking instructions.

2. An interlock for an integrated isolator and circuit breaker according to claim 1, wherein, The circuit breaker locking slider is provided with a baffle plate at both ends.

3. An interlock for an integrated isolator and circuit breaker according to claim 1, wherein, The three-position indicator is provided with a groove, and a stud is arranged on the hand motor baffle plate, and when the grounding switch is in the closed position, the groove is aligned with the stud on the hand motor baffle plate.

4. An integrated isolator and circuit breaker interlock according to claim 1, wherein, The lower door interlocking rod is connected with the grounding interlocking plate through a spring, and the grounding interlocking plate blocks the upward path of the lower door interlocking rod when the disconnector is in the closed or open position, and only when the three-position indicator is in the grounding position, the interlocking rod can be lifted to unlock the lower door.

5. An integrated isolator and circuit breaker interlock according to claim 1, wherein, The MCU control box receives signals of the grounding switch auxiliary travel switch, and when the grounding switch is in the closed position, the MCU control box outputs a locking signal to the disconnector operating circuit to prohibit power transmission operation.

6. An interlock device for an integrated isolator and circuit breaker according to any one of claims 1-5, wherein, The mechanical interlocking module and the electrical interlocking module are integrated in the operating mechanism of the ring main unit or the circuit breaker.

7. An integrated isolator and circuit breaker interlock according to claim 1, wherein, The interlocking device is used for the ring main unit, the circuit breaker and the disconnector in the medium and high voltage power system.

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