Insulation inspection tool for extra-high voltage converter station

Abstract

The invention relates to the technical field of electrical equipment insulation detection, in particular to an extra-high voltage converter station insulation inspection tool which comprises a discharge rod, the discharge rod comprises an operating rod and an electrode tip, a protection set is installed at the upper end of the operating rod, and a polishing set and an auxiliary discharge set are installed on the protection set; the electrode tip is sealed and protected through the protection group during non-operation, so that the surface of the electrode tip is effectively prevented from being oxidized due to factors such as humid environment; before discharging, a polishing block with the lower hardness on the upper side is adopted for light polishing, and an oxide layer generated on the surface due to storage is removed; after discharging, the polishing block with the lower side being high in hardness is adopted for applying larger polishing force for deep polishing, an oxide layer generated by the high temperature of an electric arc is effectively removed, and therefore the safety and reliability of follow-up detection are guaranteed; in addition, multi-point contact with electrified equipment is realized by means of the auxiliary discharge group, and thorough release of residual charges is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment insulation detection, and particularly relates to an insulation inspection tool for an extra-high voltage converter station. BACKGROUND

[0002] As a key facility in a power system, the insulation performance of an extra-high voltage converter station is directly related to the safe and stable operation of the power system. Insulation inspection is an important means to ensure the insulation state of the converter station equipment, and is mainly used to prevent faults or accidents caused by insulation deterioration. The steps of insulation inspection include electricity checking, discharge and megohmmeter detection. First, it is checked whether the equipment is electrified, then the equipment is discharged by using a discharge rod to eliminate residual charge, and finally the insulation resistance is measured by using a megohmmeter. Among them, the discharge link is crucial, which can effectively release the residual charge on the equipment, avoid electric shock danger or measurement error in subsequent detection, and ensure the safety of the detection personnel.

[0003] At present, the discharge operation of the extra-high voltage converter station mainly relies on a discharge rod. The discharge rod is usually composed of an operating rod and an electrode head. The operating rod provides insulation protection, and the electrode head directly contacts the electrified equipment for discharge. In actual operation, the staff first grounds the discharge rod through a grounding wire, then holds the operating rod, slowly approaches the electrified equipment with the electrode head, and generates arc discharge until the residual charge is released.

[0004] The existing discharge rod has the following problems when performing discharge operation: at the moment of discharge, high-temperature arc is generated between the electrode head and the electrified equipment, which may cause the surface of the metal electrode head to be oxidized, and the surface of the metal electrode head is prone to form an oxide layer. Secondly, during the daily storage of the discharge rod, the surface of the electrode head may be dampened and an oxide layer is generated due to environmental humidity and other factors. The oxide layer increases the contact resistance of the electrode head, which requires a higher voltage to break down the air gap to generate an arc at the initial stage of discharge, which may cause misjudgment. At the same time, the increase of the contact resistance may also cause the charge release path to be not smooth, resulting in incomplete discharge, and thus reducing the safety and reliability of subsequent detection. SUMMARY

[0005] In order to solve the above technical problems, the application adopts the following technical scheme: a UHV converter station insulation inspection tool, comprising a discharge rod, the discharge rod comprising an operating rod and an electrode head, a protection group is installed on the upper end of the operating rod, a polishing group and an auxiliary discharge group are installed on the protection group; the protection group comprises an insulating sleeve fixedly sleeved on the operating rod, a sliding plate is sleeved on the upper end of the insulating sleeve, a plurality of circumferentially uniformly arranged protection covers are radially and slidingly installed on the upper end of the sliding plate, a synchronous piece is connected between the protection cover and the sliding plate, after discharge, the synchronous piece drives the plurality of protection covers to contact each other to seal the electrode head, after discharge, the synchronous piece drives the protection covers to separate and slide down the sliding plate, so that the electrode head is exposed; the polishing group comprises two upper and lower arranged polishing blocks radially and slidingly installed in the protection cover through elastic abutting rods, the abrasive hardness of the lower polishing block is greater than that of the upper polishing block, a connecting piece is connected between the elastic abutting rod and the protection cover; when the sliding plate slides, the protection cover drives the corresponding polishing block through the connecting piece to polish the electrode head; a limiting plate is connected between the two elastic abutting rods and the sliding plate, the elastic abutting rod corresponding polishing block polishes the electrode head through cooperation of the elastic abutting rod and the limiting plate, and then the electrode head is lightly polished by the polishing block with small abrasive hardness before discharge and deeply polished by the polishing block with large abrasive hardness after discharge, so that the surface oxide layer of the electrode head is removed.

[0006] Preferably, the synchronous piece comprises a synchronous ring rotatably installed at the lower end of the sliding plate, a plurality of circumferentially uniformly arranged synchronous grooves are formed in the upper end of the synchronous ring, a synchronous block is slidingly installed in the synchronous groove, and the upper end of the synchronous block radially and slidingly penetrates the sliding plate and is fixedly connected with the corresponding protection cover.

[0007] Preferably, the synchronous ring is penetrated and slidingly installed with an elastic locking rod one, two locking grooves one are formed in the lower end of the sliding plate, and the locking grooves one and the elastic locking rod one cooperate to lock the position of the synchronous ring.

[0008] Preferably, the synchronous ring is fixedly installed with a connecting ring at the lower end, the connecting ring is radially and slidingly penetrated and installed with an elastic locking rod two, two upper and lower misaligned locking grooves two are formed in the insulating sleeve, and the elastic locking rod two is used to cooperate with the locking grooves two to lock the position of the connecting ring.

[0009] Preferably, one end of the elastic abutting rod away from the middle of the electrode head slidingly penetrates the protection cover, the connecting piece comprises a connecting plate radially and slidingly installed outside the protection cover through an elastic guide rod, and the connecting plate and the corresponding elastic abutting rod are rotatably connected.

[0010] Preferably, the limiting plate is fixedly installed on the upper end of the sliding plate, a circular hole corresponding to the elastic abutting rod is formed in the limiting plate, and the elastic abutting rod is arranged in the corresponding circular hole.

[0011] Preferably, a plurality of limiting blocks are uniformly arranged on the outer side of the elastic abutting rod, a plurality of limiting grooves are uniformly arranged on the position corresponding to the round hole of the limiting plate, and the limiting grooves and the corresponding round hole are communicated, and the limiting grooves are used to limit the radial position of the elastic abutting rod in cooperation with the limiting blocks.

[0012] Preferably, a plurality of through holes are uniformly arranged on the position corresponding to the round hole of the limiting plate, the through holes and the corresponding round hole are communicated, and the through holes and the corresponding limiting grooves are arranged in a circumferential staggered manner, when the through hole and the limiting block are aligned, the elastic abutting rod moves radially synchronously with the protective cover.

[0013] Preferably, the auxiliary discharge group includes a conductive ring distributed on the outer side of the electrode head, a plurality of elastic contact pins are fixedly installed on the upper end of the conductive ring, a plurality of L-shaped rods are fixedly installed on the outer side of the conductive ring, and the vertical section of the L-shaped rod is slidably penetrated through the sliding plate and fixedly installed with an operating ring.

[0014] Preferably, the elastic limiting rod is radially penetrated and slidably installed on the operating ring, two limiting holes arranged in an up-down manner are formed on the outer side of the insulating sleeve corresponding to the position of the elastic limiting rod, and the limiting holes are used to lock the position of the operating ring in cooperation with the elastic limiting rod.

[0015] The beneficial effects of the present application are as follows: 1. The protective group of the present application seals and protects the electrode head during non-operation, effectively preventing the surface of the electrode head from being oxidized due to environmental humidity and other factors; and the present application slightly polishes the electrode head before discharge to remove the storage oxidation layer, and deeply polishes after discharge to remove the arc oxidation layer, thereby ensuring the safety and reliability of subsequent detection; in addition, the present application realizes multi-point contact with the live equipment by means of the auxiliary discharge group, and ensures that the residual charge is completely released.

[0016] 2. The present application seals and protects the electrode head by a plurality of protective covers, and the present application sets up two polishing blocks with different hardness and elastic pressure, the upper polishing block with smaller hardness is used for slight polishing before discharge to remove the oxidation layer generated by storage, and the lower polishing block with larger hardness is used for deep polishing after discharge to remove the oxidation layer generated by arc high temperature, thereby ensuring that the contact performance of the electrode head is always good.

[0017] 3. The present application realizes auxiliary discharge by the conductive ring with elastic contact pins, during discharge operation, the elastic contact pins can be in contact with the surface of the live equipment under the action of the elastic structure, so that the conductive ring makes multi-point contact with the live equipment through the elastic contact pins, to realize auxiliary discharge of the live equipment, thereby ensuring that the live equipment can be completely discharged, and further ensuring the safety and reliability of subsequent detection. BRIEF DESCRIPTION OF DRAWINGS

[0018] The application will be further described in connection with the accompanying drawings and examples.

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of the application.

[0020] Figure 2 is a state diagram of the application before the electrode head is completely exposed.

[0021] Figure 3 is a schematic diagram of the three-dimensional structure of the protective cover, the synchronization ring and the synchronization block after the sliding plate is cut out.

[0022] Figure 4 is an exploded view of the synchronization ring and the sliding plate.

[0023] Figure 5 is a sectional view of the insulating sleeve, the sliding plate, the synchronization ring, the connecting ring and the operating ring.

[0024] Figure 6 is a schematic diagram of the three-dimensional structure of the insulating sleeve.

[0025] Figure 7 is a cutaway view of the application.

[0026] Figure 8 is a schematic diagram of the three-dimensional structure of the elastic abutting rod after the limiting plate is cut out.

[0027] Reference signs: 1, discharge rod; 11, operating rod; 12, electrode head; 2, protective group; 21, insulating sleeve; 211, locking groove two; 212, limiting hole; 22, sliding plate; 221, locking groove one; 23, protective cover; 24, synchronization part; 241, synchronization ring; 242, synchronization block; 243, elastic locking rod one; 244, connecting ring; 245, elastic locking rod two; 3, polishing group; 31, elastic abutting rod; 311, limiting block; 32, polishing block; 33, connecting part; 331, elastic guide rod; 332, connecting plate; 34, limiting plate; 341, limiting groove; 342, through hole; 4, auxiliary discharge group; 41, conductive ring; 42, elastic contact pin; 43, L-shaped rod; 44, operating ring; 441, elastic limiting rod. DETAILED DESCRIPTION

[0028] The examples described below are exemplary and are only used to explain the application and cannot be understood as a limitation of the application. If the specific technology or condition is not indicated in the examples, the technology or condition described in the literature in the art or according to the product instruction is used.

[0029] Reference is made to Figure 1 and Figure 2The utility model provides an insulation inspection tool for extra-high voltage converter station, including discharge rod 1, discharge rod 1 includes operating rod 11 and electrode head 12, and the upper end of operating rod 11 is equipped with the protection group 2, and the protection group 2 is equipped with the polishing group 3.

[0030] Refer to Figure 1 And Figure 2 The protection group 2 includes the insulation sleeve 21 fixedly sleeved on the operating rod 11, the upper end of the insulation sleeve 21 is sleeved with the sliding plate 22, the upper end of the sliding plate 22 is radially slidably installed with a plurality of circumferentially uniformly arranged protective covers 23, and the protective cover 23 and the sliding plate 22 are connected with the synchronous piece 24;The protective cover 23 is installed with a sealing strip on the side edge, so that when the plurality of protective covers 23 contact each other, a stable sealed cavity can be formed;The polishing group 3 includes two upper and lower arranged polishing blocks 32 radially slidably installed in the protective cover 23 through the elastic abutting rod 31, the abrasive hardness of the lower polishing block 32 is greater than that of the upper polishing block 32, and the elastic abutting rod 31 and the protective cover 23 are connected with the connecting piece 33;The two elastic abutting rods 31 and the sliding plate 22 are connected with the limiting plate 34;The electrode head 12 is sealed and protected by the protection group 2, so that the electrode head 12 is prevented from being damp and generating an oxide layer on the surface due to environmental humidity and other factors during daily storage, and the electrode head 12 is polished by the polishing group 3, so that the oxide layer on the surface of the electrode head 12 is removed, ensuring the safety and reliability of subsequent detection.

[0031] Specifically, when the discharge operation needs to be carried out on the live equipment, the operator first controls the synchronous piece 24 to drive the plurality of protective covers 23 to move outward synchronously, the protective cover 23 drives the corresponding polishing block 32 to move synchronously through the connecting piece 33, then pushes the elastic abutting rod 31 located on the upper side inward and controls the upper elastic abutting rod 31 and the limiting plate 34 to cooperate, so that the polishing block 32 located on the upper side moves to the corresponding position of the electrode head 12, then slides the sliding plate 22 downward, so that the electrode head 12 is exposed, in the process, the protective cover 23 drives the corresponding polishing block 32 to move downward through the connecting piece 33, under the action of the upper elastic abutting rod 31, the inner side of the corresponding polishing block 32 abuts against the outer side of the electrode head 12 and moves downward with the protective cover 23, so that the polishing block 32 polishes the electrode head 12, since the oxide layer on the surface of the electrode head 12 is mainly generated during storage at this time, and under the sealing action of the protective cover 23, the oxide layer on the surface of the electrode head 12 is less, therefore, the polishing block 32 with smaller abrasive hardness on the upper side is used to polish the electrode head 12 slightly at this time.

[0032] In the process of sliding the sliding plate 22 downward, the operator can reciprocally rotate the sliding plate 22, so that the protective cover 23 drives the polishing block 32 to move downward while reciprocally rotating, thereby increasing the polishing effect of the polishing block 32 on the surface of the electrode head 12 and increasing the polishing and cleaning effect on the oxide layer on the surface of the electrode head 12. When the upper polishing block 32 moves to the lower end of the electrode head 12, the cooperation between the upper elastic abutting rod 31 and the limiting plate 34 is released, the upper elastic abutting rod 31 drives the corresponding polishing block 32 to move outward to a position away from the electrode head 12, and the sliding plate 22 is continuously slid downward, so that the electrode head 12 is completely exposed.

[0033] The operator grounds the discharge rod 1 through the grounding wire, then holds the operating rod 11 to slowly approach the live equipment with the electrode head 12, until arc discharge is generated. After the discharge is completed, the sliding plate 22 is slid upward, and the elastic abutting rod 31 at the lower side is pushed inward, and the cooperation between the elastic abutting rod 31 at the lower side and the limiting plate 34 is controlled, so that the protective cover 23 drives the polishing block 32 at the lower side to polish the electrode head 12. Since the oxide layer on the surface of the electrode head 12 at this time is mainly generated by the high temperature of the arc during discharge, the polishing block 32 with greater hardness at the lower side is used to polish the electrode head 12 deeply at this time. After the sliding plate 22 moves to the initial position, the synchronous piece 24 drives the plurality of protective covers 23 to move inward synchronously, so that the plurality of protective covers 23 contact each other to seal the electrode head 12.

[0034] It should be noted that one of the polishing blocks 32 in the present application is closer to the middle of the electrode head 12 (see Figure 7 ), so as to ensure that the top of the electrode head 12 can be polished comprehensively, and the lower end of the polishing block 32 is provided with a slope for guiding, so that the polishing block 32 can move along the surface of the electrode head 12 during polishing operation. The elastic force of the elastic abutting rod 31 at the lower side is greater than that of the elastic abutting rod 31 at the upper side, so that the polishing block 32 at the lower side not only uses abrasive with greater hardness, but also uses greater polishing force to polish the electrode head 12 deeply. Similarly, the polishing block 32 at the upper side uses abrasive with smaller hardness and smaller polishing force to polish the electrode head 12 lightly. Then, through the light polishing of the polishing block 32 at the upper side on the electrode head 12 before discharge and the deep polishing of the polishing block 32 at the lower side on the electrode head 12 after discharge, it is ensured that there is no oxide layer remaining on the surface of the electrode head 12 before the discharge operation.

[0035] Referring to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6The synchronizer 24 comprises a synchronizer ring 241 rotatably installed at the lower end of the sliding plate 22, a plurality of synchronizer grooves are uniformly arranged on the upper end of the synchronizer ring 241, a synchronizer block 242 is slidably installed in the synchronizer grooves, the upper end of the synchronizer block 242 is slidably penetrated through the sliding plate 22 and is fixedly connected with the corresponding protective cover 23; the protective cover 23 is slidably connected with the sliding plate 22 through a sliding block, the synchronizer block 242 is fixedly connected with the sliding block; the synchronizer ring 241 is slidably penetrated and installed with an elastic locking rod one 243, two locking grooves one 221 are arranged on the lower end of the sliding plate 22; the lower end of the synchronizer ring 241 is fixedly installed with a connecting ring 244, the connecting ring 244 is slidably penetrated and installed with an elastic locking rod two 245 in the radial direction, two locking grooves two 211 are arranged on the insulating sleeve 21 in a staggered manner.

[0036] By pulling out the elastic locking rod one 243 from the locking groove one 221, the position locking of the synchronizer ring 241 is released, the elastic locking rod two 245 is pulled out from the locking groove two 211, the position locking of the connecting ring 244 is released, then the synchronizer ring 241 is rotated, the synchronizer ring 241 drives the protective cover 23 to move synchronously in and out through the cooperation of the synchronizer grooves and the synchronizer block 242, the elastic locking rod one 243 is inserted into the corresponding locking groove one 221 at this time, the position of the synchronizer ring 241 is locked again, after the sliding plate 22 moves downward, the elastic locking rod two 245 is inserted into the corresponding locking groove two 211 at this time, the position of the connecting ring 244 is locked again, the electrode head 12 is exposed, and the protective cover 23 is fixed relative to the operating rod 11, and the protective cover 23 can seal the electrode head 12 in the same way, which will not be described herein.

[0037] In order to achieve slight polishing of the electrode head 12 before discharging and deep polishing of the electrode head 12 after discharging, the present application adopts the following structure: Figure 2 , Figure 7 and Figure 8 , one end of the elastic abutting rod 31 away from the middle part of the electrode head 12 slidably penetrates the protective cover 23, the connecting piece 33 comprises a connecting plate 332 slidably installed on the outer side of the protective cover 23 through an elastic guide rod 331, and the connecting plate 332 is rotationally connected with the corresponding elastic abutting rod 31; the limiting plate 34 is fixedly installed on the upper end of the sliding plate 22, a plurality of circular holes corresponding to the elastic abutting rod 31 are arranged on the limiting plate 34, and the elastic abutting rod 31 penetrates the corresponding circular holes; a plurality of limiting blocks 311 are uniformly arranged on the outer side of the elastic abutting rod 31 in the circumferential direction, a plurality of limiting grooves 341 are uniformly arranged on the positions of the corresponding circular holes on the limiting plate 34 in the circumferential direction, and the limiting grooves 341 are in communication with the corresponding circular holes; a plurality of through holes 342 are arranged on the positions of the corresponding circular holes on the limiting plate 34 in the circumferential direction, the through holes 342 are in communication with the corresponding circular holes, and the through holes 342 and the corresponding limiting grooves 341 are arranged in the circumferential direction in a staggered manner.

[0038] Specifically, initially, the through hole 342 and the limiting block 311 are one-to-one corresponding, when the protective cover 23 moves in and out, the protective cover 23 drives the elastic abutting rod 31 to move outward through the elastic guide rod 331 and the connecting plate 332, because the through hole 342 and the limiting block 311 are corresponding in position, that is, the limiting plate 34 cannot block the elastic abutting rod 31 from moving outward, so that the elastic abutting rod 31 drives the polishing block 32 to move away from the electrode head 12, by pressing the connecting plate 332 inward, the elastic abutting rod 31 drives the limiting block 311 to move through the through hole 342 to the side of the limiting plate 34 close to the electrode head 12, then the elastic abutting rod 31 is manually rotated to make the limiting block 311 and the limiting groove 341 corresponding in position, then the connecting plate 332 is released, under the action of the elastic guide rod 331, the connecting plate 332 drives the limiting block 311 to insert into the limiting groove 341 through the elastic abutting rod 31, so that the radial position of the elastic abutting rod 31 is limited, at this time, the polishing block 32 and the electrode head 12 are corresponding in position, so that the upper polishing block 32 can lightly polish the electrode head 12 before discharge, and the lower polishing block 32 can deeply polish the electrode head 12 after discharge.

[0039] In order to further ensure that the live equipment is completely discharged, the application adopts the following structure: referring to Figure 1 、 Figure 2 、 Figure 5 and Figure 6 , the auxiliary discharge group 4 is installed on the protective group 2; the auxiliary discharge group 4 includes the conductive ring 41 distributed on the outer side of the electrode head 12, a plurality of elastic contact pins 42 are fixedly installed on the upper end of the conductive ring 41, a plurality of L-shaped rods 43 are fixedly installed on the outer side of the conductive ring 41, the vertical section of the L-shaped rod 43 is slidably penetrated through the sliding plate 22 and is fixedly installed with the operating ring 44; the elastic limiting rod 441 is radially penetrated through and slidably installed on the operating ring 44, and the two limiting holes 212 arranged in upper and lower positions are formed on the outer side of the insulating sleeve 21 corresponding to the position of the elastic limiting rod 441; the conductive ring 41 and the lower end of the electrode head 12 are commonly welded with an electric wire (not shown in the figure).

[0040] Specifically, when the electrode head 12 is exposed, the elastic limiting rod 441 is pulled out of the lower limiting hole 212, then the operating ring 44 is pushed upward, the operating ring 44 drives the conductive ring 41 to move upward through the L-shaped rod 43, so that the conductive ring 41 drives the elastic contact pin 42 to move upward, then the elastic limiting rod 441 is inserted into the upper limiting hole 212 to lock the position of the operating ring 44, when the operator holds the operating rod 11 to approach the live equipment to the electrode head 12, at this time, the elastic contact pin 42 can be in contact with the surface of the live equipment under the action of its elastic structure, so that the conductive ring 41 is in multi-point contact with the live equipment through the elastic contact pin 42, to assist the discharge of the live equipment, so as to ensure that the live equipment can be completely discharged, and further ensure the safety and reliability of subsequent detection.

[0041] The present application is used for discharging operation of the equipment with insulation check. First, the operator controls the synchronous member 24 to drive the multiple protective covers 23 to move synchronously outward, so that the polishing block 32 is far away from the electrode head 12. Then, the upper elastic abutting rod 31 is pushed inward and the position is locked by the limiting plate 34, so that the upper polishing block 32 is in position correspondence with the electrode head 12. Then, the sliding plate 22 is slid downward, so that the electrode head 12 is gradually exposed. In this process, the upper polishing block 32 slightly polishes the surface of the electrode head 12 under the action of the elastic abutting rod 31, so as to remove the oxidation layer generated during storage. The operator can also rotate the sliding plate 22 reciprocatingly to enhance the polishing effect. After the electrode head 12 is completely exposed, the discharge rod 1 is grounded and close to the charged equipment for discharging. After the discharging is completed, the sliding plate 22 is slid upward, and the lower elastic abutting rod 31 is locked by being pushed inward, so that the lower polishing block 32 deeply polishes the electrode head 12, so as to remove the oxidation layer generated during discharging. Finally, the synchronous member 24 drives the protective cover 23 to move synchronously inward, so as to form a sealed cavity to protect the electrode head 12. In addition, the elastic contact pin 42 of the auxiliary discharge group 4 contacts the charged equipment at multiple points, so as to further ensure the complete discharging. Therefore, by means of the multiple measures such as slight polishing before discharging, deep polishing after discharging and sealing protection, the oxidation layer on the surface of the electrode head 12 is effectively removed, and the safety and detection reliability of the discharging operation are ensured.

[0042] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

[0043] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature can be below or obliquely below the second feature, or it only means that the horizontal height of the first feature is lower than that of the second feature.

[0044] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "connected", "mounted", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected, or slidingly connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The embodiments of the present specific embodiment are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. An insulation inspection tool for an ultra-high voltage converter station, comprising a discharge rod, the discharge rod including an operating rod and an electrode head, characterized in that, The upper end of the operating lever is equipped with a protective assembly, and a grinding assembly and an auxiliary discharge assembly are installed on the protective assembly; The protective assembly includes an insulating sleeve fixedly fitted onto the operating rod. A sliding plate is fitted onto the upper end of the insulating sleeve. Multiple circumferentially evenly arranged protective covers are radially slidably installed on the upper end of the sliding plate. A synchronizing element is connected between the protective covers and the sliding plate. After discharge, the synchronizing element is controlled to drive the multiple protective covers to contact each other to seal the electrode head. Before discharge, the synchronizing element is controlled to drive the protective covers to separate and slide the sliding plate down to expose the electrode head. The grinding assembly includes two grinding blocks arranged vertically and horizontally, which are radially slidably installed inside the protective cover via an elastic clamping rod. The abrasive hardness of the lower grinding block is greater than that of the upper grinding block. A connecting piece connects the elastic clamping rod and the protective cover. When the sliding plate slides, the protective cover drives the corresponding grinding block to grind the electrode head through the connecting piece; A limiting plate connects the two elastic clamping rods and the sliding plate. The elastic clamping rods and the limiting plate work together to make the grinding block corresponding to the elastic clamping rod grind the electrode head. Then, the electrode head is lightly ground by the grinding block with low abrasive hardness before discharge, and the electrode head is deeply ground by the grinding block with high abrasive hardness after discharge to remove the oxide layer on the surface of the electrode head.

2. The insulation inspection tool for an ultra-high voltage converter station according to claim 1, characterized in that, The synchronizing component includes a synchronizing ring rotatably mounted on the lower end of the sliding plate. The upper end of the synchronizing ring has multiple circumferentially evenly arranged synchronizing grooves. A synchronizing block is slidably mounted in the synchronizing groove. The upper end of the synchronizing block radially slides through the sliding plate and is fixedly connected to the corresponding protective cover.

3. The insulation inspection tool for an ultra-high voltage converter station according to claim 2, characterized in that, An elastic locking rod is slidably mounted through the synchronization ring, and two locking slots are opened at the lower end of the sliding plate. The locking slots and the elastic locking rod work together to lock the position of the synchronization ring.

4. The insulation inspection tool for an ultra-high voltage converter station according to claim 2, characterized in that, A connecting ring is fixedly installed at the lower end of the synchronization ring. An elastic locking rod is radially and slidably installed through the connecting ring. Two locking grooves are provided on the insulating sleeve, which are arranged vertically and vertically. The elastic locking rod is used to cooperate with the locking groove to lock the position of the connecting ring.

5. The insulation inspection tool for an ultra-high voltage converter station according to claim 1, characterized in that, The end of the elastic clamping rod away from the middle of the electrode head slides through the protective cover. The connecting piece includes a connecting plate that is radially slidably installed on the outside of the protective cover via an elastic guide rod, and the connecting plate and the corresponding elastic clamping rod are rotatably connected.

6. The insulation inspection tool for an ultra-high voltage converter station according to claim 1, characterized in that, The limiting plate is fixedly installed on the upper end of the sliding plate. The limiting plate has a circular hole corresponding to the elastic abutment rod, and the elastic abutment rod passes through the corresponding circular hole.

7. The insulation inspection tool for an ultra-high voltage converter station according to claim 6, characterized in that, Multiple circumferentially evenly arranged limiting blocks are fixedly installed on the outer side of the elastic clamping rod. Multiple circumferentially evenly arranged limiting grooves are opened at the corresponding positions of the circular holes on the limiting plate, and the limiting grooves are connected to the corresponding circular holes. The limiting grooves are used to cooperate with the limiting blocks to limit the radial position of the elastic clamping rod.

8. The insulation inspection tool for an ultra-high voltage converter station according to claim 7, characterized in that, The limiting plate has multiple circumferentially evenly arranged through holes at the corresponding circular holes. The through holes are connected to the corresponding circular holes, and the through holes and the corresponding limiting grooves are arranged circumferentially in an alternating manner. When the through holes and the limiting blocks are aligned, the elastic clamping rod moves radially synchronously with the protective cover.

9. The insulation inspection tool for an ultra-high voltage converter station according to claim 1, characterized in that, The auxiliary discharge group includes conductive rings distributed on the outside of the electrode head. Several elastic contact pins are fixedly installed on the upper end of the conductive rings. Multiple L-shaped rods are fixedly installed on the outside of the conductive rings. The lower end of the vertical section of the L-shaped rod slides through the sliding plate and is fixedly installed with an operating ring.

10. The insulation inspection tool for an ultra-high voltage converter station according to claim 9, characterized in that, An elastic limiting rod is radially penetrated and slidably installed on the operating ring. Two limiting holes are opened on the outside of the insulating sleeve corresponding to the position of the elastic limiting rod. The limiting holes are used to cooperate with the elastic limiting rod to lock the position of the operating ring.

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