Interlocking device for switch cabinet, switch cabinet and method for testing insulation resistance of switch cabinet

Abstract

The invention provides an interlocking device for a switch cabinet, the switch cabinet and a method for testing insulation resistance of the switch cabinet, the interlocking device comprises a first switch assembly movably arranged on a handcart chamber, and the first switch assembly is used for opening or closing an operation hole; the program lock assembly is provided with an unlocking key, the program lock assembly is arranged on the handcart chamber, the program lock assembly has an unlocking state and a locking state, when the circuit breaker is located at the test position, the program lock assembly is in the unlocking state so that the unlocking key can be pulled out, and after the unlocking key is pulled out, the program lock assembly is locked. When the circuit breaker is located at the connecting position, the program lock assembly is in a locked state, so that the unlocking key is fixed on the program lock assembly; and the second switch assembly is provided with a lock hole, and the second switch assembly and the program lock assembly share an unlocking key, so that when the circuit breaker is located at the test position and the unlocking key is pulled out, the second switch assembly can open the electricity testing door through the unlocking key.

Description

Technical Field

[0001] The present invention relates to the technical field of switch cabinets, and mainly relates to an interlocking device for a switch cabinet, the switch cabinet and a method for testing insulation resistance thereof. Background Art

[0002] In the power system industry, before medium-voltage switchgear supplies power to the load and closes the circuit, to ensure safety, it is necessary to confirm whether the load's insulation is qualified. This is generally determined by measuring the load's insulation resistance to ground. For long-term standby loads, their insulation resistance to ground also needs to be measured regularly to detect abnormal conditions early and deal with them in a timely manner.

[0003] Generally, the insulation resistance can be measured by measuring the insulation resistance at the static contact on the load side of the circuit breaker chamber, or by measuring the insulation resistance at the cable joint in the cable chamber. At present, in order to avoid the problem of repeatedly releasing the "five-protection" interlock when opening the cable chamber door to test the resistance, which may damage the mechanism and cause the "five-protection" interlock to fail, an interlocking device is used. However, the interlocking device in the prior art requires opening the trolley chamber door and removing the key before the circuit breaker trolley is locked in the test position. The trolley chamber is a high-voltage chamber, and operations in the trolley chamber may touch high-voltage electricity, which poses a safety problem to the operator. On the other hand, it also increases the complexity of operating the interlocking device. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an interlocking device for a switch cabinet, a switch cabinet and a method for testing insulation resistance thereof, which ensures that when the circuit breaker is in different positions, the corresponding operating holes and the electrical test door can only be operated in a predetermined safety sequence, thereby improving the safety of insulation resistance testing and reducing operational complexity.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] One aspect of the present application provides an interlocking device for a switchgear, the switchgear comprising a cable compartment and a trolley compartment. The trolley compartment houses a circuit breaker, the trolley compartment is provided with an operating hole for allowing a tool to pass through to switch the circuit breaker between a test position and a connection position. The cable compartment is provided with an electrical test door. The interlocking device comprises:

[0007] a first switch assembly, movably disposed on the trolley chamber, the first switch assembly being used to open or close the operating hole;

[0008] a program lock assembly having an unlocking key, the program lock assembly being disposed on the trolley chamber and having an unlocked state and a locked state. When the circuit breaker is in the test position, the program lock assembly is in the unlocked state so that the unlocking key can be removed. After the unlocking key is removed, the first switch assembly can be locked in a position closing the operating hole. When the circuit breaker is in the connected position, the program lock assembly is in the locked state so that the unlocking key is fixed to the program lock assembly.

[0009] The second switch assembly is provided with a lock hole. The second switch assembly and the program lock assembly share the unlocking key so that when the circuit breaker is in the test position and the unlocking key is pulled out, the second switch assembly can open the electrical test door through the unlocking key.

[0010] According to a technical solution of the present application, the first switch assembly includes a knob member and a baffle, the knob member is connected to the baffle, and the knob member is movably arranged on the trolley chamber so that the baffle covers or opens the operating hole. When the unlocking key is pulled out, the program lock assembly can fix the knob member on the trolley chamber, and the baffle covers the operating hole.

[0011] According to a technical solution of the present application, the program lock assembly includes a first limit member, and the unlocking key can drive the first limit member to rotate. The first switch assembly also includes a second limit member, and the second limit member is connected to the knob member. When the unlocking key is pulled out, the unlocking key drives the first limit member to move, and the first limit member and the second limit member are engaged to fix the knob member on the trolley chamber.

[0012] According to a technical solution of the present application, the first limiting member is provided with a first notch, and the second limiting member is provided with a second notch. When the first notch and the second notch are arranged opposite to each other, the first limiting member can make an arc movement relative to the second limiting member under the drive of the unlocking key, and the second limiting member can make an arc movement relative to the first limiting member under the drive of the knob member. When the first notch and the second notch are staggered, the baffle is locked in the position of closing the operating hole.

[0013] According to a technical solution of the present application, a first elastic member is further included, which is connected between the trolley chamber and the second limiting member, so that the second limiting member drives the knob member and the baffle to return to a position that covers the operating hole.

[0014] According to a technical solution of the present application, the first elastic member includes a torsion spring, the trolley chamber is provided with a first connecting hole, the second limiting member is provided with a second connecting hole, one end of the torsion spring is connected to the first connecting hole, and the other end of the torsion spring is connected to the second connecting hole.

[0015] According to a technical solution of the present application, the program lock assembly includes a second elastic member and a limit rod, the surface of the limit rod is provided with a groove, the second elastic member is connected between one axial end of the limit rod and the trolley chamber, when the circuit breaker is in the connected position, the limit rod is engaged with the first limit member to lock the program lock assembly, when the circuit breaker is in the test position, the other axial end of the limit rod is against the circuit breaker, and a movable space is formed between the opening of the groove and the first limit member to unlock the program lock assembly.

[0016] According to a technical solution of the present application, the limiting rod includes a rod body and a convex ring, the convex ring is arranged on the outer surface of the rod body and is raised relative to the outer surface of the rod body, the convex ring and the outer surface of the rod body enclose the groove, and the first limiting member is provided with a third notch. When the circuit breaker is in the connected position, the convex ring is engaged in the third notch. When the circuit breaker is in the test position, the rod body is at least partially embedded in the third notch, and the movable space is formed between the rod body and the third notch.

[0017] A second aspect of the present application discloses a switch cabinet, comprising a cabinet body and an interlocking device for the switch cabinet as described in any one of the above embodiments.

[0018] A third aspect of the present application discloses a method for testing insulation resistance of a switch cabinet, which is applied to the above-mentioned switch cabinet. The method comprises:

[0019] Opening the first switch assembly and controlling the circuit breaker to move to a test position;

[0020] Pulling out the unlocking key from the program lock assembly to fix the first switch assembly in a position closing the operating hole;

[0021] Control the closing of the grounding switch of the switchgear;

[0022] Control the opening of the grounding switch of the switchgear;

[0023] Insert the unlocking key into the second switch assembly to open the electrical inspection door;

[0024] The insulation resistance of the cable joints in the cable chamber is measured and obtained.

[0025] Beneficial effects:

[0026] The interlocking device for a switch cabinet disclosed in the present application can realize the operation control of the circuit breaker by controlling the opening and closing of the operating hole by manipulating the first switch assembly, ensuring that the circuit breaker can only be operated when it is in the correct position. The interlocking design of the program lock assembly, the first switch assembly and the second switch assembly ensures that when the circuit breaker is in different positions, the corresponding operating holes and the test door can only be operated in a predetermined safety sequence. For example, when the circuit breaker is in the connection position, the program lock assembly is in a locked state, and the unlocking key is fixed on the program lock assembly, which means that unless the circuit breaker is in the test position, the test door cannot be opened for the test operation, which effectively prevents illegal or erroneous operations and protects the safety of the operator. On the other hand, when the circuit breaker is in the test position, the program lock assembly is in the unlocked state, allowing the unlocking key to be pulled out, and at the same time controlling the first switch assembly to be locked in the closed position of the operating hole, thereby preventing the operator from changing the position of the circuit breaker through the operating hole. Moreover, the operator can lock the operating hole in the closed position by removing the key from the program lock assembly. The operation method is simple and effective. Compared with the solution in the prior art that requires opening the trolley room door and removing the key to lock the circuit breaker trolley in the test position, the safety problem caused to the operator by opening the trolley room to lock the circuit breaker can be avoided, and the complexity of the operation is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A partial schematic diagram of a switch cabinet according to an embodiment of the present application;

[0028] Figure 2 for Figure 1 A local schematic diagram of point A;

[0029] Figure 3 A schematic diagram of the outer side of a door panel of a handcart compartment according to an embodiment of the present application;

[0030] Figure 4 A schematic diagram of the inner side of a door panel of a handcart compartment according to an embodiment of the present application;

[0031] Figure 5 for Figure 4 A local schematic diagram of point B;

[0032] Figure 6 This is a schematic diagram of a first switch component according to an embodiment of the present application;

[0033] Figure 7 This is a second schematic diagram of the first switch component according to an embodiment of the present application;

[0034] Figure 8 A schematic diagram of a second position-limiting member according to an embodiment of the present application;

[0035] Figure 9A schematic diagram of a program lock component according to an embodiment of the present application;

[0036] Figure 10 A schematic diagram of a first position-limiting member according to an embodiment of the present application;

[0037] Figure 11 A schematic diagram of a cable compartment door according to an embodiment of the present application;

[0038] Figure 12 This is a flow chart of a method for testing insulation resistance according to an embodiment of the present application;

[0039] The corresponding relationship between the reference numerals and component names is as follows:

[0040] 100 cable room;

[0041] 200 trolley chamber, 201 operating hole, 202 first notch, 203 groove, 204 third notch;

[0042] 300 electrical test door;

[0043] 1 first switch assembly, 101 second notch, 102 second connecting hole, 11 knob, 12 baffle, 13 second limiter;

[0044] 2 program lock assembly, 21 first limiting member, 22 second elastic member, 23 limiting rod, 231 rod body, 232 convex ring;

[0045] 3 second switch assembly;

[0046] 4. First elastic member. DETAILED DESCRIPTION

[0047] The present invention provides an interlocking device for a switchgear, a switchgear, and a method for testing insulation resistance thereof. To clarify the objectives, technical solutions, and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0050] In the power system industry, before medium-voltage switchgear energizes and closes the load, it is necessary to confirm the load's insulation quality to ensure safety. This is generally determined by measuring the load's insulation resistance to ground. For long-term standby loads, the insulation resistance to ground must also be regularly measured to detect and address any abnormalities early.

[0051] Among them, the insulation resistance measurement point can be selected from the load-side static contact of the circuit breaker room of the medium-voltage switchgear or the cable joint of the cable room for measurement. If you choose to measure the insulation resistance at the load-side static contact of the circuit breaker room, you need to open the circuit breaker room door, remove the circuit breaker, use a high-voltage tester to confirm that the load-side static contact is de-energized, and then use a megohmmeter to measure the insulation resistance. Then, reverse the operation to restore to the previous state. In this method, since measuring the load insulation of the medium-voltage switchgear is a regular task with a large workload, a transfer cart is required to move the circuit breaker in and out. The circuit breaker is large in size and weight, so it requires a lot of labor from the operator.

[0052] If you choose to measure insulation resistance at the cable splice, during the operation, you need to confirm that the circuit breaker is in the open state, swing the circuit breaker out to the isolation position, close the grounding switch, open the cable room door, and then manually release the "five-protection" interlock to open the grounding switch, measure the insulation resistance, and then reverse the operation to restore the previous state. In this way, since the grounding switch needs to be operated four times for each insulation resistance measurement, it is easy to cause wear and failure of the operating mechanism shaft. In addition, measuring load insulation in medium-voltage switchgear is a regular task with a large workload. Repeatedly releasing the "five-protection" interlock may damage the mechanism and cause the "five-protection" interlock to fail.

[0053] To avoid the problem of repeatedly releasing the "five-protection" interlock when opening the cable compartment door to test resistance, which could damage the mechanism and cause the "five-protection" interlock to fail, an interlocking device is generally used. However, existing interlocking devices require opening the trolley compartment door and removing the key before locking the circuit breaker trolley in the test position. The trolley compartment is a high-voltage room, and operating within the trolley compartment could expose operators to high-voltage electricity, posing a safety hazard. This also increases the complexity of operating the interlocking device.

[0054] To this end, this application provides an interlocking device for a switch cabinet, please refer to the attached Figure 1 The switch cabinet includes a cable compartment 100 and a trolley compartment 200. The trolley compartment 200 is equipped with a circuit breaker. The trolley compartment 200 is provided with an operating hole 201. The operating hole 201 is used for passing tools to switch the circuit breaker between the test position and the connection position. The cable compartment 100 is provided with an electrical test door 300. The interlocking device includes a first switch assembly 1, a program lock assembly 2 and a second switch assembly 3.

[0055] Among them, Figure 1 As shown, the switch cabinet is divided by partitions, usually forming at least a cable compartment 100 and a trolley compartment 200. The trolley compartment 200 is equipped with a circuit breaker, and an operating hole 201 is provided on the door panel of the trolley compartment 200. The operating tool is inserted into the inner side of the trolley compartment door panel through the operating hole 201 on the side outside the trolley compartment door panel to move the circuit breaker from the connection position to the test position. After the insulation resistance test is completed, the circuit breaker can also be moved from the test position to the connection position through the operating hole 201. In this way,

[0056] As attached Figure 1 and Figure 2 As shown, the first switch assembly 1 is movably arranged on the trolley chamber 200. The first switch assembly 1 is used to open or close the operating hole 201, so that the opening and closing of the operating hole 201 can be controlled by manipulating the first switch assembly 1, thereby realizing the operation control of the circuit breaker and ensuring that the circuit breaker can only be operated when it is in the correct position.

[0057] The program lock assembly 2 has an unlocking key. The program lock assembly 2 is arranged on the trolley chamber 200. The program lock assembly 2 has an unlocking state and a locking state. When the circuit breaker is in the test position, the program lock assembly 2 is in the unlocking state so that the unlocking key can be pulled out. After the unlocking key is pulled out, the first switch assembly 1 can be locked in the position of closing the operating hole 201. When the circuit breaker is in the connection position, the program lock assembly 2 is in the locking state so that the unlocking key is fixed on the program lock assembly 2. In this way, the program lock assembly 2 can change its own state (such as unlocked state or locked state) according to the position of the circuit breaker (such as the test position or the connection position). When the circuit breaker is in the test position, the program lock assembly 2 is in the unlocked state, allowing the unlocking key to be pulled out, and at the same time controlling the first switch assembly 1 to be locked in the closed position of the operating hole 201. This can prevent the operator from changing the position of the circuit breaker through the operating hole 201, and the operator can lock the operating hole 201 in the closed position by removing the key from the program lock assembly 2. The operation method is simple and effective. Compared with the solution in the prior art that the circuit breaker trolley must be locked in the test position by opening the trolley room door and removing the key, the safety problem caused to the operator by opening the trolley room 200 to lock the circuit breaker can be avoided, and the complexity of the operation is greatly reduced. When the circuit breaker is in the connection position, the program lock assembly 2 is in a locked state, fixing the unlocking key. In this way, the unlocking key cannot be removed from the trolley chamber 200, and the power test door 300 set in the cable chamber 100 cannot be unlocked, ensuring that the power test door 300 will not be opened by mistake.

[0058] Specifically, the program lock assembly 2 is installed on the door panel of the trolley room.

[0059] As attached Figure 1 and Figure 11 As shown, the second switch assembly 3 is provided with a lock hole. The second switch assembly 3 and the program lock assembly 2 share an unlocking key. When the circuit breaker is in the test position and the unlocking key is pulled out, the second switch assembly 3 can use the unlocking key to open the power test door 300. In detail, the second switch assembly 3 with the lock hole and the program lock assembly 2 share an unlocking key. In this way, when the circuit breaker is in the test position and the unlocking key is pulled out, the second switch assembly 3 can use the unlocking key to open the power test door 300, allowing the power test operation in the cable chamber 100 to be performed, thereby improving the safety of the operation.

[0060] Furthermore, by providing an electrical test door 300 on the cable chamber 100, the second switch assembly 3 can open or close the electrical test door 300 by using an unlocking key. In this way, when measuring the insulation resistance of the device in the cable chamber 100, it is possible to avoid directly opening the cable chamber door, then manually releasing the "five protections" interlock to separate the grounding switch, measuring the insulation resistance, and then reversing the operation sequence to restore the previous state. Instead, by opening the electrical test door 300 provided on the cable chamber 100, the cable insulation test operation in the cable chamber 100 can be performed without manually releasing the "five protections".

[0061] The interlocking device for a switchgear disclosed in this application ensures that when the circuit breaker is in different positions, the corresponding operating holes 201 and the test door 300 can only be operated in a predetermined safety sequence. For example, when the circuit breaker is in the connected position, the program lock assembly 2 is in a locked state, and the unlocking key is fixed to the program lock assembly 2. This means that unless the circuit breaker is in the test position, the test door 300 cannot be opened for the test operation. This effectively prevents illegal or erroneous operations and protects the safety of the operator. On the other hand, the current status of the circuit breaker is also intuitively indicated by the removal and insertion of the unlocking key, making operation more simple and intuitive.

[0062] Furthermore, as attached Figure 6 and Figure 7 As shown, the first switch assembly 1 includes a knob 11 and a baffle 12. The knob 11 is connected to the baffle 12 and is movably mounted on the trolley chamber 200 so that the baffle 12 can block or open the operating hole 201. When the unlocking key is removed, the program lock assembly 2 can secure the knob 11 to the trolley chamber 200, with the baffle 12 blocking the operating hole 201. In this way, by rotating or pushing the knob 11, the operator can easily open or close the operating hole 201 and perform necessary operations on the circuit breaker. Furthermore, when the unlocking key is removed, the program lock assembly 2 can secure the knob 11 to the trolley chamber 200, ensuring that when the baffle 12 needs to be locked to block the operating hole 201 when the circuit breaker is in the test position, the knob 11 will not be accidentally operated or moved, thereby increasing the safety of the device. Furthermore, the unlocking process is also very convenient: simply insert the unlocking key and rotate or push it to release the knob 11.

[0063] In detail, as attached Figure 2 and Figure 3As shown, the knob 11 is provided on the door panel of the trolley compartment 200 and is located outside the trolley compartment 200. The knob 11 serves as an intuitive operating interface, allowing the operator to easily identify and operate it, while the baffle 12 can be provided on the inner side of the door panel of the trolley compartment 200 to prevent it from being exposed outside the door panel of the trolley compartment 200 and easily damaged. Moreover, the provision of the baffle 12 makes the status of the operating hole 201 clear at a glance. When the baffle 12 blocks the operating hole 201, it indicates that the operating hole 201 is in a closed state, and the circuit breaker cannot be operated at this time. When the baffle 12 is opened, the operating hole 201 is exposed, and the operator can perform necessary operations. This clear indication function reduces the possibility of misoperation.

[0064] Specifically, as attached Figure 5 and Figure 8 As shown, the program lock assembly 2 includes a first limiter 21, which can be driven to rotate by the unlocking key. The first switch assembly 1 also includes a second limiter 13, which is connected to the knob 11. When the unlocking key is removed, the unlocking key drives the first limiter 21 to move, and the first limiter 21 and the second limiter 13 engage to secure the knob 11 to the trolley chamber 200. Thus, when the unlocking key is removed, the first limiter 21 rotates under the drive of the key and engages with the second limiter 13. This engaging connection effectively prevents accidental movement or operation of the knob 11 in the locked state, thereby enhancing the locking stability and reliability of the interlocking device. Furthermore, the use of the matching structure of the first limiter 21 and the second limiter 13 further simplifies the structure and operation of the interlocking device.

[0065] It can be understood by those skilled in the art that when the circuit breaker is in the test position, the program lock assembly 2 is in the unlocked state, and the unlocking key can be pulled out at this time. When the unlocking key needs to be pulled out, the unlocking key needs to be rotated a certain angle before it can be pulled out. In the process of rotating the unlocking key, the first limit member 21 is synchronously driven to a position where it is engaged with the second limit member 13.

[0066] Optionally, one of the first limit member 21 and the second limit member 13 is provided with a slot, and the other of the first limit member 21 and the second limit member 13 is provided with a protrusion. When the unlocking key is rotated and pulled out, the first limit member 21 moves to the position where the slot and the protrusion are engaged, thereby locking the first switch assembly 1.

[0067] In some embodiments, the first limiting member 21 is provided with a first notch 202, and the second limiting member 13 is provided with a second notch 101. When the first notch 202 and the second notch 101 are arranged relative to each other, the first limiting member 21 can make an arc movement relative to the second limiting member 13 under the drive of the unlocking key, and the second limiting member 13 can make an arc movement relative to the first limiting member 21 under the drive of the knob member 11. When the first notch 202 and the second notch 101 are staggered, the baffle 12 is locked in the position of closing the operating hole 201. Specifically, when the circuit breaker is in the connected position, the first notch 202 is disposed opposite the second notch 101, thereby allowing the operating hole 201 to be opened or closed by rotating the knob 11. When the circuit breaker is in the test position, the unlocking key is rotated to synchronously drive the first limiting member 21 to rotate, so that the first limiting member 21 is embedded in the second notch 101. At this time, the first notch 202 and the second notch 101 are offset, so that the knob 11 cannot drive the second limiting member 13 to rotate, thereby locking the baffle 12 in the position closing the operating hole 201. In this way, by correspondingly providing the first notch 202 and the second notch 101 on the first limiting member 21 and the second limiting member 13, the notch design allows the first limiting member 21 and the second limiting member 13 to move relative to each other when driven by the unlocking key or the knob 11, making the locking and unlocking operations smoother and improving the response speed and reliability of the entire interlocking device.

[0068] For example, Figure 8 、 Figure 9 and Figure 10 As shown, the edge of the first notch 202 is correspondingly designed to be the motion trajectory of the second limit member 13 driven by the rotation of the knob member 11, that is, the edge of the first notch 202 is the edge of the arc groove 203. Similarly, the edge of the second notch 101 is also correspondingly designed to be the motion trajectory of the first limit member 21 driven by the rotation of the unlocking key, so that the first limit member 21 and the second limit member 13 can accurately perform arc motion within the preset motion range corresponding to the arc edge of the notch.

[0069] In certain embodiments, as Figure 6 and Figure 7As shown, the tool further includes a first elastic member 4, which is connected between the trolley compartment 200 and the second stopper 13, so that the second stopper 13 drives the knob 11 and the baffle 12 to return to a position that blocks the operating hole 201. The addition of the first elastic member 4 allows the second stopper 13, the knob 11, and the baffle 12 to automatically return to a position that blocks the operating hole 201 when no external force is applied. Specifically, after the knob 11 and the baffle 12 are moved in position by an external force, for example, by rotating the knob 11 to open the operating hole 201, a tool can be inserted into the trolley compartment 200 through the operating hole 201, move the circuit breaker in the trolley compartment 200 to the test position, and then remove the tool. The second stopper 13, the knob 11, and the baffle 12 can automatically return to their initial position, i.e., a position that blocks the operating hole 201, when no external force is applied. This prevents the operating hole 201 from being exposed to the outside for extended periods, improving the safety of the device. Because the knob 11 and baffle 12 have an automatic reset function, even if an unexpected situation occurs during operation, such as the operator suddenly interrupting or making an incorrect operation, the knob 11 and baffle 12 will automatically return to a safe state, enhancing the reliability and stability of the device, thereby avoiding the risk of possible misoperation and ensuring the safe and stable operation of the power system. Furthermore, after completing the circuit breaker operation, the operator does not need to perform an additional reset operation on the knob 11 and baffle 12; they automatically reset, simplifying the operating process and improving operational efficiency.

[0070] Optionally, the first elastic member 4 may be a compression spring, a rubber element, etc., which can provide a restoring force through its own elastic deformation to reset the knob member 11 and the baffle 12.

[0071] For further example, the first elastic member 4 includes a torsion spring, the trolley chamber 200 is provided with a first connecting hole, the second limiting member 13 is provided with a second connecting hole 102, one end of the torsion spring is connected to the first connecting hole, and the other end of the torsion spring is connected to the second connecting hole 102.

[0072] The first elastic member 4 achieves the aforementioned automatic reset function by employing a torsion spring. As a common elastic element, the torsion spring features a simple structure, compact size, and ease of installation. Hooks are provided at each end of the torsion spring, which can be hooked onto the first and second connection holes 102, respectively. The torsion spring is connected to the interlocking device via the first connection hole in the trolley chamber 200 and the second connection hole 102 in the second stopper 13. Furthermore, the torsion spring exhibits excellent elastic restoring force, enabling it to quickly return to its original state after being subjected to external forces. This restoring force ensures that the knob 11 and baffle 12 automatically return to their positions obstructing the operating hole 201 after the circuit breaker is operated, thereby improving the reliability and stability of the device.

[0073] Specifically, the program lock assembly 2 includes a second elastic member 22 and a limiting rod 23. A groove 203 is provided on the surface of the limiting rod 23. The second elastic member 22 is connected between one axial end of the limiting rod 23 and the trolley chamber 200. When the circuit breaker is in the connected position, the limiting rod 23 is engaged with the first limiting member 21 to lock the program lock assembly 2. When the circuit breaker is in the test position, the other axial end of the limiting rod 23 is against the circuit breaker, and a movable space is formed between the opening of the groove 203 and the first limiting member 21 to unlock the program lock assembly 2. In this way, when the circuit breaker is in the connected position, the limit rod 23 is engaged with the first limit piece 21. At this time, since the unlocking key is transmission-connected to the first limit piece 21, the first limit piece 21 is engaged with the limit rod 23, and the unlocking key cannot be rotated and removed, thereby locking the program lock assembly 2. Furthermore, since the test door 300 of the cable chamber 100 and the program lock assembly 2 share a key, the operator cannot use the unlocking key to open the test door 300 for operation, thereby enhancing the safety and reliability of the interlocking device and preventing illegal or erroneous operation.

[0074] like Figure 5 and Figure 9 As shown, when the circuit breaker moves from the connected position to the test position, the other axial end of the limit rod 23 abuts against the circuit breaker, pushing the limit rod 23 to move. Since a movable space is formed between the opening of the groove 203 and the first limit member 21, the movement of the limit rod 23 drives the first limit member 21 to rotate, thereby unlocking the program lock assembly 2. In this way, by rotating the knob member 11 to drive the baffle 12 to open the operating hole 201, the circuit breaker is moved to the test position, which can enable the program lock assembly 2 to realize the automatic unlocking function, further simplifying the operation process and improving the operating efficiency.

[0075] On the other hand, since the interlocking device of the present application does not require opening the trolley chamber door for operation, by connecting the second elastic member 22 between one axial end of the limit rod 23 and the trolley chamber 200, during the movement of the circuit breaker, the second elastic member 22 can absorb and buffer the force generated by collision or impact, thereby reducing damage to the interlocking device and extending its service life.

[0076] For example, Figure 4 As shown, the second elastic member 22 is a spring, which has good resilience and can also make the structure of the device more compact.

[0077] In some specific embodiments, the limiting rod 23 includes a rod body 231 and a protruding ring 232. The protruding ring 232 is provided on the outer surface of the rod body 231 and is provided in a protruding manner relative to the outer surface of the rod body 231. The protruding ring 232 and the outer surface of the rod body 231 enclose a groove 203. The first limiting member 21 is provided with a third notch 204. When the circuit breaker is in the connection position, the protruding ring 232 is engaged in the third notch 204. When the circuit breaker is in the test position, the rod body 231 is at least partially embedded in the third notch 204, forming a movable space between the rod body 231 and the third notch 204. Figure 9 As shown, the program lock assembly 2 is locked by the engagement between the protruding ring 232 on the limiting rod 23 and the third notch 204 on the first limiting member 21. When the circuit breaker is in the connected position, the protruding ring 232 engages with the third notch 204 on the first limiting member 21 and mates with the third notch 204 of the first limiting member 21. This engagement is stable and reliable, making it difficult to accidentally disengage, thereby preventing the unlocking key from being rotated and removed. When the circuit breaker is moved from the connected position to the test position, the rod body 231 of the limiting rod 23 abuts against the circuit breaker, and the protruding ring 232 is driven by the rod body 231 toward the trolley compartment door, thereby compressing the second elastic member. At this point, the rod body 231 is at least partially embedded in the third notch 204, creating a movable space between the rod body 231 and the third notch 204. This allows the limiting rod 23 to rotate the first limiting member 21 during movement, thereby unlocking the program lock assembly 2. This unlocking method is simple and quick, requiring no additional steps. Moreover, by locking the unlocking key, the operator can clearly perceive the changes in the locking and unlocking states, which helps to reduce the possibility of misoperation and improve the safety and accuracy of operation.

[0078] An embodiment of the second aspect of the present application provides a switch cabinet, comprising a cabinet body and an interlocking device for a switch cabinet as described in any of the above embodiments. The above interlocking device of the switch cabinet is applied to the switch cabinet, thereby having all the above beneficial effects, which will not be repeated here.

[0079] like Figure 12 As shown, an embodiment of the third aspect of the present application provides a method for testing insulation resistance of a switch cabinet, which is applied to a switch cabinet as described above, and the method includes:

[0080] S1: Open the first switch assembly 1 and control the circuit breaker to move to the test position;

[0081] S2: Pull out the unlocking key from the program lock assembly 2 to fix the first switch assembly 1 in the position of closing the operating hole 201;

[0082] S3: Controls the closing of the grounding switch of the switchgear;

[0083] S4: Controls the grounding switch of the switchgear to open;

[0084] S5: Insert the unlocking key into the second switch assembly 3 to open the electrical inspection door 300;

[0085] S6: Measure and obtain the insulation resistance of the cable joints in the cable chamber 100 .

[0086] Specifically, the method for testing the insulation resistance of the switch cabinet described above is as follows: first, open the first switch assembly 1 and control the circuit breaker to move to the test position. In this way, the operating hole 201 can be opened correspondingly by the first switch assembly 1, thereby moving the circuit breaker from its connected position (i.e., the working position) to the test position. Then, after the circuit breaker reaches the test position, it is necessary to pull out the unlocking key from the program lock assembly 2 so that the first switch assembly 1 remains in the position of closing the operating hole 201, thereby ensuring that the operating hole 201 will not be opened by mistake when the insulation resistance test is performed, avoiding the danger caused by changing the test position of the circuit breaker, and increasing the safety of the test. Next, it is necessary to control the grounding switch of the switch cabinet to close the switch. This is to ensure that all equipment in the switch cabinet is in a safe grounding state when the insulation resistance test is performed, to prevent the accidental current generated by the test from causing damage to equipment or personnel. After the grounding switch is closed, the grounding switch is opened. This step is to prepare for subsequent electrical testing and insulation resistance measurement. Then insert the unlocking key into the second switch assembly 3 to open the test door 300. This step is to prepare for the insulation resistance measurement of the cable joints in the cable chamber 100. After opening the test door 300, the insulation resistance of the cable joints in the cable chamber 100 is measured by using appropriate measuring tools (such as an insulation resistance meter).

[0087] In more detail, after the insulation resistance test is performed using the above method, the insulation test door is closed and the unlocking key is pulled out. The unlocking key is then inserted into the program lock assembly 2 on the door panel of the trolley room to unlock the first switch assembly 1. The operating hole 201 is opened by the unlocking key, and the circuit breaker is shaken to the working position for operation.

[0088] The method for testing the insulation resistance of the switch cabinet adopted in the present application does not require the circuit breaker to be shaken out of the cabinet, and the cable insulation test operation of the cable chamber 100 can be performed without manually releasing the "five protections". After the circuit breaker is moved to the test position, the position of the circuit breaker can be prevented from being changed due to misoperation by removing the unlocking key, ensuring the safety of people and equipment, and the grounding switch only needs to perform the necessary closing and opening operations once. In the prior art, it is necessary to shake the circuit breaker trolley to the test position, close the grounding switch first, and then open the cable chamber door and keep the cable chamber door open. After manually destroying the five-protection interlock, the grounding switch must be opened before the insulation resistance test inside the switch cabinet can be performed. After the insulation resistance test, the grounding switch must be closed, the cable chamber door must be closed, and the grounding switch must be opened in sequence before the circuit breaker can be shaken from the test position to the working position for operation. In this way, an insulation resistance test requires operating the grounding switch four times, which can easily cause wear and tear on the grounding switch operating mechanism and the corresponding interlocking module, resulting in failure. At the same time, the five-protection interlock needs to be repeatedly released manually, which will accelerate the failure of the five-protection interlock. Moreover, since the grounding switch is in the open state, it cannot be ensured that the circuit breaker will not be accidentally switched into the working position for operation during the insulation cable test.

[0089] It can be seen that the switch cabinet interlocking device used in the present application prevents the operating hole 201 from being opened by locking the first switch assembly 1 by pulling out the unlocking key, ensuring that the circuit breaker will not be accidentally swing into the working position for operation when performing the insulation cable test, and in the process of testing the insulation resistance, it is only necessary to close and open the grounding switch once, which simplifies the working process of testing the insulation resistance and ensures the safety of the test process, avoiding mechanical wear and failure of the switch cabinet components due to frequent operation.

[0090] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the scope of protection of the present invention.

Claims

1. An interlocking device for a switch cabinet, characterized in that: The switch cabinet includes a cable room and a trolley room. The trolley room is equipped with a circuit breaker. The trolley room is provided with an operating hole for allowing tools to pass through so as to switch the circuit breaker between a test position and a connection position. The cable room is provided with an electrical test door. The interlocking device includes: a first switch assembly, movably disposed on the trolley chamber, the first switch assembly being used to open or close the operating hole; a program lock assembly having an unlocking key, the program lock assembly being disposed on the trolley chamber and having an unlocked state and a locked state. When the circuit breaker is in the test position, the program lock assembly is in the unlocked state so that the unlocking key can be removed. After the unlocking key is removed, the first switch assembly can be locked in a position closing the operating hole. When the circuit breaker is in the connected position, the program lock assembly is in the locked state so that the unlocking key is fixed to the program lock assembly. The second switch assembly is provided with a lock hole. The second switch assembly and the program lock assembly share the unlocking key so that when the circuit breaker is in the test position and the unlocking key is pulled out, the second switch assembly can open the electrical test door through the unlocking key.

2. The interlocking device for a switch cabinet according to claim 1, characterized in that: The first switch assembly includes a knob and a baffle, the knob is connected to the baffle, and the knob is movably arranged on the trolley chamber so that the baffle covers or opens the operating hole. When the unlocking key is pulled out, the program lock assembly can fix the knob on the trolley chamber, and the baffle covers the operating hole.

3. The interlocking device for a switch cabinet according to claim 2, characterized in that: The program lock assembly includes a first limit member, and the unlocking key can drive the first limit member to rotate. The first switch assembly also includes a second limit member, and the second limit member is connected to the knob member. When the unlocking key is pulled out, the unlocking key drives the first limit member to move, and the first limit member and the second limit member are engaged to fix the knob member on the trolley chamber.

4. The interlocking device for a switch cabinet according to claim 3, characterized in that: The first limiting member is provided with a first notch, and the second limiting member is provided with a second notch. When the first notch and the second notch are arranged opposite to each other, the first limiting member can make an arc movement relative to the second limiting member under the drive of the unlocking key, and the second limiting member can make an arc movement relative to the first limiting member under the drive of the knob member. When the first notch and the second notch are staggered, the baffle is locked in the position of closing the operating hole.

5. The interlocking device for a switch cabinet according to claim 3, characterized in that: It also includes a first elastic member, which is connected between the trolley chamber and the second limiting member, so that the second limiting member drives the knob member and the baffle to return to a position that covers the operating hole.

6. The interlocking device for a switch cabinet according to claim 5, characterized in that: The first elastic member includes a torsion spring, the trolley chamber is provided with a first connecting hole, the second limit member is provided with a second connecting hole, one end of the torsion spring is connected to the first connecting hole, and the other end of the torsion spring is connected to the second connecting hole.

7. The interlocking device for a switch cabinet according to claim 3, characterized in that: The program lock assembly includes a second elastic member and a limit rod. A groove is provided on the surface of the limit rod. The second elastic member is connected between one axial end of the limit rod and the trolley chamber. When the circuit breaker is in the connected position, the limit rod is engaged with the first limit member to lock the program lock assembly. When the circuit breaker is in the test position, the other axial end of the limit rod is abutted against the circuit breaker, and a movable space is formed between the opening of the groove and the first limit member to unlock the program lock assembly.

8. The interlocking device for a switch cabinet according to claim 7, characterized in that: The limiting rod includes a rod body and a convex ring. The convex ring is arranged on the outer surface of the rod body and is raised relative to the outer surface of the rod body. The convex ring and the outer surface of the rod body enclose the groove. The first limiting member is provided with a third notch. When the circuit breaker is in the connected position, the convex ring is engaged in the third notch. When the circuit breaker is in the test position, the rod body is at least partially embedded in the notch, and the movable space is formed between the rod body and the third notch.

9. A switch cabinet, characterized in that: The invention comprises a cabinet body and an interlocking device for a switch cabinet according to any one of claims 1 to 8.

10. A method for testing insulation resistance of a switch cabinet, applied to the switch cabinet as claimed in claim 9, characterized in that: The method comprises: Opening the first switch assembly and controlling the circuit breaker to move to a test position; Pulling out the unlocking key from the program lock assembly to fix the first switch assembly in a position closing the operating hole; Control the closing of the grounding switch of the switchgear; Control the opening of the grounding switch of the switchgear; Insert the unlocking key into the second switch assembly to open the electrical inspection door; The insulation resistance of the cable joints in the cable chamber is measured and obtained.

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