Protection assembly used for electrical cabinet

Abstract

The utility model discloses a protection assembly for an electrical cabinet, which comprises a high-voltage switch cabinet, the interior of the high-voltage switch cabinet is divided into four units by partition plates, the protection assembly comprises a cable chamber, a cabinet door is arranged on the cable chamber, a placing hole is formed in the cabinet door, a telescopic pipe is arranged on the inner wall of the cabinet door, a metal contact is arranged at the head of the telescopic pipe, and a high-voltage electroscope is arranged in the telescopic pipe. The high-voltage electroscope comprises a grip, a protective ring, a telescopic rod, a detection unit and a metal probe, an insertion hole is formed in a metal contact, and the telescopic rod is made of insulating rubber; according to the utility model, the placing hole, the telescopic pipe, the metal contact and the high-voltage electroscope are matched, and when the cabinet door is closed, the high-voltage electroscope drives the metal contact to contact with the grounding switch outside the cabinet door, so that the high-voltage electroscope can be indirectly contacted with the grounding switch, and then whether the grounding switch is electrified can be detected; compared with judgment of indirect electricity testing, electricity testing is directly carried out on equipment needing electricity testing.

Description

Technical Field

[0001] This utility model relates to the field of electrical cabinet technology, and in particular to a protective component for use in electrical cabinets. Background Technology

[0002] High-voltage switchgear is a type of high-voltage electrical cabinet, and the problem of voltage detection in high-voltage electrical cabinets has long plagued power safety production. According to the "Electrical Work Regulations", voltage detection must be performed before installing grounding wires or closing grounding switches. The mechanical "five-proof" interlocking device of the "five-proof" switchgear introduced today cannot meet the safety regulations' requirement of voltage detection before grounding wire installation. When performing power outage work, it must be verified that the equipment has no voltage before closing the grounding switch. However, enclosed high-voltage switchgear is in a fully enclosed state. Under normal operation, it is impossible to use a portable high-voltage detector to test the equipment. This may lead to situations where the cabinet door is forcibly opened for voltage detection.

[0003] However, the existing solution is generally to determine whether the high-voltage electrical cabinet is still energized by indirect voltage testing. Indirect voltage testing is performed on a fully enclosed high-voltage electrical cabinet, which is in a closed state. This involves judging whether the equipment inside the distribution cabinet is energized by changes in the mechanical indicator position, electrical indicator, energized display device, instrument, and various telemetry and remote signaling signals. Although indirect voltage testing allows for objective observation of whether the equipment inside the distribution cabinet is energized without touching the equipment, there is a possibility of malfunction in the mechanical indicators, display instruments, etc., which can easily lead to misjudgment by the staff through indirect voltage testing, thereby easily causing the danger of electric shock.

[0004] Existing methods allow for the creation of perforations in cabinet doors, enabling the insertion of high-voltage detectors to directly test the internal equipment for voltage. However, the current carried by the internal equipment can easily radiate out through the perforations, posing a potential personal danger to external personnel during voltage testing.

[0005] Therefore, to meet the safety regulations' requirement of testing for voltage before grounding, staff can directly test the voltage of the equipment inside the cabinet from outside the cabinet door, avoiding inaccurate indirect voltage testing due to malfunctions of mechanical indicators, display instruments, and other equipment. Based on the opening in the cabinet door, to prevent the leakage of internal current, a protective component for use in electrical cabinets is proposed. Utility Model Content

[0006] The purpose of this utility model is to address the aforementioned problems by providing a protective component for use in electrical cabinets. This utility model, through the combination of a placement hole, a telescopic tube, a metal contact, and a high-voltage detector, allows personnel to, from outside the cabinet door with the door closed, move the high-voltage detector, along with the metal contact, towards the grounding switch. This indirect contact between the high-voltage detector and the grounding switch allows for the detection of whether the grounding switch is energized, preventing forced unlocking of the cabinet door. Compared to indirect detection, directly testing the required electrical equipment provides higher safety. To achieve the aforementioned purpose, the technical solution adopted by this utility model is as follows:

[0007] According to one aspect of this utility model, a protective component for use in an electrical cabinet is provided, including a high-voltage switchgear. The high-voltage switchgear is internally divided into four units by partitions: a handcart compartment, a busbar compartment, a relay instrument compartment, and a cable compartment. A grounding switch is provided in the cable compartment. The cable compartment has a cabinet door with a placement hole. A telescopic tube is provided on the inner wall of the cabinet door. The head of the telescopic tube has a metal contact for contacting the grounding switch. The telescopic tube corresponds to the placement hole. A high-voltage detector is provided inside the telescopic tube. The high-voltage detector includes a handle, a protective ring, a telescopic rod, a detection unit, and a metal probe. The metal contact has an insertion hole that mates with the metal probe on the high-voltage detector. The telescopic tube is made of insulating rubber.

[0008] Preferably, the metal contact and the telescopic tube are connected by multiple rubber springs.

[0009] Preferably, each expansion joint on the telescopic tube is connected and expanded by keyways, that is, two keyways are symmetrically opened on the outer wall of the expansion joint, and two internal splines that cooperate with the keyways are symmetrically provided on the inner wall of the expansion joint, and the length of each keyway is less than the length of the corresponding expansion joint.

[0010] Preferably, the telescopic joint at the head of the telescopic tube is provided with a rubber retaining ring, and the inner wall of the cabinet door is provided with an annular groove that cooperates with the rubber retaining ring.

[0011] Preferably, the diameter of the detection unit of the high-voltage detector head is larger than the diameter of the telescopic joint of the telescopic tube head, and two limiting blocks that match the diameter of the detection unit of the high-voltage detector are symmetrically arranged on the inner wall of the telescopic joint of the telescopic tube head.

[0012] Preferably, the cabinet door has a cover for the hole, a locking plate is installed on the inner side of the cover via a pivot, the cover shell has a lock hole that is coaxial with the pivot, the high voltage detector has a key that matches the shape of the lock hole, the lock hole has an anti-theft design, for example, the lock hole is hexagonal, one side of the lock hole has a notch, and there are arc-shaped edges at symmetrical positions.

[0013] Preferably, the rotating shaft is divided into a base and a top cover. The base has four spring holes, each containing a support spring. Each support spring has a cylindrical magnet. The combined height of the support springs and the cylindrical magnets exceeds that of the base. The bottom of the top cover has four slots that mate with the four cylindrical magnets. The key on the high voltage detector contains a magnet with the same magnetism as the cylindrical magnets.

[0014] Preferably, the cabinet door is provided with a coil spring, and an identification strip is wound around the coil spring. The other end of the identification strip is connected to the head of the telescopic tube, and the identification strip is marked with a mark for indicating the telescopic tube's extension distance.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] 1. The protective component for electrical cabinets described in this utility model, through the combination of placement holes, telescopic tubes, metal contacts, and a high-voltage detector, allows personnel to move the metal contacts and telescopic tube towards the grounding switch from outside the cabinet door, with the cabinet door closed. The metal contacts then make contact with the grounding switch, allowing the high-voltage detector to indirectly contact the grounding switch and detect whether it is energized. This avoids the need forcibly unlocking the cabinet door. Compared to indirect voltage detection, directly testing the required equipment is safer, more intuitive, and more convenient, preventing potential safety hazards.

[0017] 2. The protective component for use in electrical cabinets described in this utility model, by setting a hole cover with a lock hole, and in conjunction with the key on the high-voltage detector, as well as the rotating shaft and locking plate, prevents sand, rain and snow from entering the equipment from the placement hole when the high-voltage switchgear is installed outdoors, during maintenance in severe weather conditions such as wind, sand and rain. In addition, with the addition of the blocking plate, the probability of external sand and rain entering is reduced during the gap between opening the hole cover and inserting the high-voltage detector, thereby improving the stability and safety of the voltage detection process. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0020] Figure 3 For the present invention Figure 2 A partial cross-section of AA;

[0021] Figure 4 For the present invention Figure 3 Enlarged view of point B;

[0022] Figure 5 This is a schematic diagram of the structure of the hole cover of the present invention;

[0023] Figure 6 For the present invention Figure 5 CC section view;

[0024] In the attached diagram: 1. High-voltage switchgear; 2. Cabinet door; 201. Ring groove; 3. Placement hole; 4. Telescopic tube; 401. Expansion joint; 402. Keyway; 403. Internal spline; 404. Rubber retaining ring; 5. Metal contact; 6. High-voltage detector; 601. Limiting block; 7. Socket; 8. Rubber spring; 9. Hole cover; 1001. Chassis; 1002. Top cover; 1003. Support spring; 1004. Cylindrical magnet; 1005. Slot; 11. Locking plate; 12. Lock hole; 13. Key; 14. Identification strip. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the utility model, and these aspects can be achieved even without these specific details.

[0026] Please see Figures 1 to 6 This utility model provides a protective component for use in electrical cabinets, and the technical solution is as follows:

[0027] The system includes a high-voltage switchgear 1, which is internally divided into four units by partitions: a truck compartment, a busbar compartment, a relay and instrument compartment, and a cable compartment. The cable compartment contains a grounding switch. The cable compartment has a cabinet door 2 with a placement hole 3. A telescopic tube 4 is installed on the inner wall of the cabinet door 2. The head of the telescopic tube 4 has a metal contact 5 for contacting the grounding switch. The telescopic tube 4 corresponds to the placement hole 3. A high-voltage detector 6 is installed inside the telescopic tube 4. The high-voltage detector 6 includes a handle, a protective ring, a telescopic rod, a detection unit, and a metal probe. The metal contact 5 has an insertion hole 7 that mates with the metal probe on the high-voltage detector 6. The telescopic tube 4 is made of insulating rubber.

[0028] Before opening cabinet door 2, the entire equipment must be powered off, and the equipment must be verified to be de-energized before closing the grounding switch. Only then can cabinet door 2 be opened. The staff will then take out a high-voltage detector 6, which is made of electronic integrated circuits. When brought close to the object being tested, it will emit an audible and visual warning when energized. According to the voltage level, it can be divided into: 0.1-10KV detector, 6KV, 10KV detector, 35KV, 66KV detector, 110KV, 220KV detector, and 500KV detector. It is a direct contact detector. The appropriate detector should be selected according to the voltage of the object being tested. Otherwise, if the voltage is too low, the detector will not be able to detect it, and if the voltage is too high, the detector may be overloaded and damaged.

[0029] The operator inserts the high-voltage detector 6 from outside the cabinet door 2 into the placement hole 3, and inserts the metal probe on the high-voltage detector 6 into the socket 7 on the metal contact 5. Then, the operator slowly moves the metal contact 5 into the cabinet using the high-voltage detector 6. During this process, the telescopic tube 4 continues to extend until the metal contact 5 contacts the grounding switch. When the operator feels resistance, the metal contact 5 contacts the grounding switch. If the grounding switch is energized, the high-voltage detector 6 will emit an audible and visual warning. If the grounding switch is not energized, the high-voltage detector 6 will not react. The operator can then open the cabinet door 2 to operate the grounding switch, such as closing the grounding switch.

[0030] The metal contact 5 and the telescopic tube 4 are connected by multiple rubber springs 8. The high-voltage detector 6 uses the metal contact 5 to test the grounding switch. The contact process should not be too long; it is only necessary to check whether the grounding switch is energized. If the contact time between the metal contact 5 and the grounding switch is too long while the grounding switch is energized, the metal contact 5 may be damaged, potentially leading to other problems such as breakage or heat transfer causing the telescopic tube 4 to burn. This could pose a personal safety hazard to workers. By connecting the metal contact 5 and the telescopic tube 4 with multiple rubber springs 8, and through measurement and setting, it is determined that when the telescopic tube 4 is fully extended, the metal contact 5 and the grounding switch are not in direct contact, but have a certain gap. At this time, the worker applies a pushing force through the high-voltage detector 6, causing the metal contact 5 to stretch the multiple rubber springs 8, making the metal contact 5 contact the grounding switch. Then, the pushing force is removed, and under the action of the multiple rubber springs 8, the metal contact 5 moves away from the grounding switch, avoiding the above-mentioned situation, improving the service life of the metal contact 5, and enhancing the safety of workers.

[0031] Each telescopic joint 401 on the telescopic tube 4 is connected and extended by keyways 402. That is, two keyways 402 are symmetrically provided on the outer wall of the telescopic joint 401, and two internal splines 403 that cooperate with the keyways 402 are symmetrically provided on the inner wall of the telescopic joint 401. The length of each keyway 402 is less than the length of the corresponding telescopic joint 401. After the operator puts the high-voltage detector 6 into the placement hole 3, the operator inserts the metal probe of the high-voltage detector 6 into the insertion hole 7 on the metal contact 5. Then, the operator slowly moves the metal contact 5 into the cabinet by using the high-voltage detector 6. During the process, since multiple telescopic joints 401 are provided with mutually cooperating keyways 402 and internal splines 403, the internal splines 403 of multiple telescopic joints 401 on the telescopic tube 4 slide in the corresponding keyways 402 until the telescopic tube 4 is fully extended.

[0032] When the telescopic tube 4 is fully extended, since the length of each keyway 402 is less than the length of the corresponding telescopic joint 401, that is, the two adjacent telescopic joints 401 are not fully extended, and the telescopic joint 401 with the smaller radius is partially inside the telescopic joint 401 with the larger radius, the support area is increased, the mutual support force is increased, and the deflection of the entire telescopic tube 4 due to gravity when it is fully extended is reduced, thereby improving the accuracy of the high voltage detector 6 when detecting the grounding switch through the metal contact 5.

[0033] A rubber retaining ring 404 is provided on the telescopic joint 401 at the head of the telescopic tube 4, and an annular groove 201 that mates with the rubber retaining ring 404 is provided on the inner wall of the cabinet door 2. After the operator inserts the high-voltage detector 6 into the placement hole 3 and aligns the metal probe with the insertion hole 7 on the metal contact 5, because both limiting blocks 601 are triangular in shape and have internal return springs, when the detection unit of the high-voltage detector 6 contacts the limiting blocks 601, it will compress the two limiting blocks 601 into the inner wall of the telescopic tube 4. After the detection unit passes, under the action of the return spring, the two limiting blocks 601 pop out, and the metal probe inserts into the insertion hole 7. Then the operator slowly pushes the high-voltage detector 6 to move the metal contact 5 closer to the grounding switch, telescopically extending the tube. The tube 4 is extended; after the grounding switch is tested for energization, the high-voltage detector 6 is pulled back. Due to the two limiting blocks 601, the telescopic tube 4 is retracted. After the telescopic tube 4 is retracted, a pulling force is applied to compress the two limiting blocks 601 on the high-voltage detector 6 into the inner wall of the telescopic tube 4, so that the detection unit can be freed from the limitation of the limiting blocks 601. Then the high-voltage detector 6 is removed from the placement hole 3, completing a complete energization test of the grounding switch inside the cabinet door 2. The two limiting blocks 601 cooperate with the detection unit of the high-voltage detector 6. After the high-voltage detector 6 extends the telescopic tube 4 through the metal contact 5, the telescopic tube 4 can be easily and conveniently retracted after the test, facilitating the next energization test.

[0034] The diameter of the detection unit at the head of the high-voltage detector 6 is larger than the diameter of the telescopic joint 401 at the head of the telescopic tube 4. Two limiting blocks 601, matching the diameter of the detection unit at the head of the telescopic tube 4, are symmetrically arranged on the inner wall of the telescopic joint 401. After completing one voltage detection operation on the grounding switch inside the cabinet door 2, the multiple telescopic joints 401 on the telescopic tube 4 retract and press against the inner wall of the cabinet door 2, awaiting the next voltage detection operation. During normal operation of the high-voltage switchgear 1, the vibration generated by the equipment itself is transmitted through the cabinet wall and thus to the cabinet door 2. During prolonged vibration, the telescopic tube 4 may experience inward sliding of the telescopic joints 401 due to vibration. A rubber retaining ring 404 is provided on the telescopic joint 401 at the head of the telescopic tube 4, and an annular groove 201 that mates with the rubber retaining ring 404 is provided on the inner wall of the cabinet door 2. When the telescopic tube 4 is fully retracted, the rubber retaining ring 404 and the annular groove 201 mutually restrict and engage, preventing the aforementioned situation from occurring and potentially contacting other equipment, thus affecting the operation of other equipment.

[0035] The cabinet door 2 has a cover 9 at the hole 3. A locking piece 11 is installed on the inner side of the cover 9 via a pivot. The outer shell of the cover 9 has a lock hole 12 that is coaxial with the pivot. The high voltage detector 6 has a key 13 that matches the shape of the lock hole 12. The lock hole 12 has an anti-theft design, for example, the lock hole 12 is hexagonal, and one side of the lock hole 12 has a notch, and there are arc-shaped edges at symmetrical positions.

[0036] When the high-voltage switchgear 1 is located outdoors, the outdoor working environment is variable. In some windy, sandy, or rainy weather, if the placement hole 3 is in direct contact with wind, sand, or rain, external impurities can easily enter the switchgear, which can easily damage the internal equipment of the high-voltage switchgear 1. This may lead to overload, short circuit, or even fire or explosion of the equipment, affecting surrounding facilities and personnel and causing unnecessary losses. A hole cover 9 is provided at the placement hole 3 outside the cabinet door 2 to avoid the above situations.

[0037] A lock hole 12 is provided on the cover 9, and a space is provided inside the cabinet. A locking plate 11 is installed through a pivot. When the cover 9 is closed, it cannot be easily opened from the outside. A key 13 that matches the shape of the lock hole 12 is provided on the high-voltage detector 6. The lock hole 12 has an anti-theft design, such as being hexagonal, having a notch on one side, and having arc-shaped edges at symmetrical positions. This design prevents foolproof and theft. External personnel need to have the appropriate key 13 to open the cover 9, preventing external personnel, such as children, from opening the cover 9 with a common key 13, thus avoiding easy access to high voltage and causing unnecessary harm. This improves personnel safety.

[0038] The rotating shaft is divided into a base 1001 and a top cover 1002. The base 1001 has four spring holes, each containing a support spring 1003. Each support spring 1003 has a cylindrical magnet 1004. The combined height of the support springs 1003 and the cylindrical magnets 1004 exceeds that of the base 1001. The bottom of the top cover 1002 has four slots 1005 that mate with the four cylindrical magnets 1004. The key 13 on the high-voltage detector 6 contains a magnet with the same magnetism as the cylindrical magnets 1004. The locking hole 12 of the cover 9 may become damaged over time. Some more regular keys 13 can forcibly open the cover 9. If untrained personnel forcibly open the cover 9, they may easily access the internal equipment, leading to damage or personal injury. Therefore, the rotating shaft is divided into a base 1001 and a top cover 1002. Four supports are provided on the base 1001... The support spring 1003 is equipped with cylindrical magnets 1004. The cylindrical magnets 1004 slightly press against the upper cover 1002, and there is a gap between the upper cover 1002 and the chassis 1001. The four cylindrical magnets 1004 cooperate with the slots 1005 to lock the chassis 1001 and the upper cover 1002, so that the chassis 1001 and the upper cover 1002 cannot rotate relative to each other, and thus the locking plate 11 cannot be easily turned open. When the key 13 on the high voltage detector 6 is used, the like magnets in the key 13 compress the corresponding support springs 1003 in the four cylindrical magnets 1004 due to the principle of like repulsion. Then, the lock hole 12 is turned, and the locking plate 11 can rotate around the lock hole 12 as the axis. After the key 13 is removed, the four cylindrical magnets 1004 extend under the action of the support springs 1003 and engage with the corresponding slots 1005 to prevent the lock hole 12 from affecting the operator's operation of the high voltage detector 6.

[0039] The cabinet door 2 is equipped with a coil spring, around which a marking strip 14 is wound. The other end of the marking strip 14 is connected to the head of the telescopic tube 4. The marking strip 14 has a mark for indicating the extension distance of the telescopic tube 4. Because the cabinet door 2 is closed, the staff cannot directly observe the length of the high-voltage detector 6 when testing the internal grounding switch. The presence of a coil spring on the cabinet door 2, with the marking strip 14 wound around it and the other end of the marking strip 14 connected to the head of the telescopic tube 4, allows the staff to observe the marking on the marking strip 14 when performing the testing operation. This allows for an objective observation of the extension distance of the high-voltage detector 6, facilitating subsequent operations and improving the observability and convenience of the testing process.

[0040] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A protective assembly for use in electrical cabinets, characterized in that, include: A high-voltage switchgear (1) is divided into four units by partitions: a handcart compartment, a busbar compartment, a relay instrument compartment, and a cable compartment. A grounding switch is provided in the cable compartment. A cabinet door (2) is provided on the cable compartment. A placement hole (3) is provided on the cabinet door (2). A telescopic tube (4) is provided on the inner wall of the cabinet door (2). A metal contact (5) for contacting the grounding switch is provided at the head of the telescopic tube (4). The telescopic tube (4) is positioned corresponding to the placement hole (3). A high-voltage detector (6) is provided inside the telescopic tube (4). The high-voltage detector (6) includes a handle, a guard ring, a telescopic rod, a detection unit, and a metal probe. An insertion hole (7) is provided on the metal contact (5) to cooperate with the metal probe on the high-voltage detector (6). The telescopic tube (4) is made of insulating rubber. The diameter of the detection unit at the head of the high voltage detector (6) is larger than the diameter of the telescopic joint (401) at the head of the telescopic tube (4). Two limiting blocks (601) that match the diameter of the detection unit at the head of the high voltage detector (6) are symmetrically arranged on the inner wall of the telescopic joint (401) at the head of the telescopic tube (4). The cabinet door (2) has a hole cover (9) at the hole (3). A locking piece (11) is installed on the inner side of the hole cover (9) via a rotating shaft. The outer shell of the hole cover (9) has a lock hole (12) that is coaxial with the rotating shaft. The high voltage detector (6) has a key (13) that matches the shape of the lock hole (12). The lock hole (12) has an anti-theft design, for example, the lock hole (12) is hexagonal, and a notch is opened on one side of the lock hole (12), and an arc edge is provided at a symmetrical position. The rotating shaft is divided into a base (1001) and a top cover (1002). The base (1001) has four spring holes, each of which is equipped with a support spring (1003). Each support spring (1003) is equipped with a cylindrical magnet (1004). The height of the multiple support springs (1003) and cylindrical magnets (1004) exceeds that of the base (1001). The bottom of the top cover (1002) is provided with four slots (1005) that cooperate with the four cylindrical magnets (1004). The key (13) on the high voltage detector (6) is equipped with a magnet with the same magnetism as the cylindrical magnets (1004).

2. A protective assembly for use in electrical cabinets according to claim 1, characterized in that: The metal contact (5) is connected to the telescopic tube (4) by multiple rubber springs (8).

3. A protective assembly for use in electrical cabinets according to claim 1, characterized in that: Each expansion joint (401) on the expansion tube (4) is connected and expanded by keyways (402). That is, two keyways (402) are symmetrically opened on the outer wall of the expansion joint, and two internal splines (403) that cooperate with the keyways are symmetrically provided on the inner wall of the expansion joint. The length of each keyway is less than the length of the corresponding expansion joint (401).

4. A protective assembly for use in electrical cabinets according to claim 3, characterized in that: The telescopic joint (401) at the head of the telescopic tube (4) is provided with a rubber retaining ring (404), and the inner wall of the cabinet door (2) is provided with an annular groove (201) that cooperates with the rubber retaining ring (404).

5. A protective assembly for use in electrical cabinets according to claim 1, characterized in that: The cabinet door (2) is provided with a coil spring, and a marking strip (14) is wound around the coil spring. The other end of the marking strip (14) is connected to the head of the telescopic tube (4). The marking strip (14) is provided with a mark for marking the telescopic distance of the telescopic tube (4).

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