CN112345901B - Partial discharge test method for insulating part for high-voltage switch - Google Patents
Partial discharge test method for insulating part for high-voltage switch Download PDFInfo
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- CN112345901B CN112345901B CN202011377663.7A CN202011377663A CN112345901B CN 112345901 B CN112345901 B CN 112345901B CN 202011377663 A CN202011377663 A CN 202011377663A CN 112345901 B CN112345901 B CN 112345901B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/16—Construction of testing vessels; Electrodes therefor
Abstract
The invention relates to a partial discharge test method of an insulating part for a high-voltage switch, which comprises the steps of preparation before test, tool installation, vacuumizing, and chargingSF 6 Gas, pressure-resistant partial discharge test, gas recovery and disassembly. The invention has the advantages that: the test method is based on a special test tool and is matched with preparation before the test, tool installation, vacuumizing and SF filling 6 The test device has the advantages that the requirements of space are reduced through procedures of gas, voltage-resisting partial discharge tests, gas recovery, disassembly and the like, the test is convenient, the whole programming is realized, the purpose of more convenient operation is realized for the electrical performance test of various test product insulating pieces, and the possibility of realization is provided for an unattended remote control system.
Description
Technical Field
The invention relates to the field of high-voltage switch tests, in particular to a partial discharge test method for an insulating part for a high-voltage switch.
Background
Partial discharge refers to an electrical discharge in which the insulation between conductors is only partially bridged, and such discharge may or may not occur near the conductors. In a strong electric field, weak points existing in the insulation inside the transformer or defects caused in the production process can cause partial discharge, the energy of the discharge is small, the short-term existence of the discharge does not affect the insulation strength of the electrical equipment, but once the medium has partial discharge, the weak discharge can generate cumulative effect to gradually deteriorate the dielectric property of the insulation and enlarge the partial defects, and finally, the insulation breakdown is caused. The long-time induction voltage band partial discharge measurement test can effectively find inherent defects inside the insulation or local hidden dangers caused by lightning impulse or operation wave impulse tests, so that the defects are eliminated, and the insulation is prevented from being damaged by partial discharge. Therefore, partial discharge tests are essential to ensure the reliability of the long-term operation of the equipment.
When the partial discharge test is carried out, the partial discharge test device is inevitably needed to be matched, at present, the commonly used partial discharge test device is a tank body and sleeve pipe combined type, and the partial discharge test device has the defects of large occupied area, high height, heavy weight, difficulty in moving and high manufacturing cost, the site utilization rate of a test room is reduced, the one-time investment cost is high, and the use efficiency is low.
For example, in patent CN209560027U, a voltage withstand partial discharge test tool for three-pillar insulators of GIL equipment is mentioned, including a cylindrical gas tank, a test trolley, a transition trolley, and a base, where the cylindrical gas tank and the transition trolley are provided with the same guide rail, the pulley of the test trolley can slide freely on the guide rails of the cylindrical gas tank and the transition trolley, the bottom of the transition trolley is provided with a second pulley that can slide freely in the guide rail of the base, the three-pillar insulators are placed on a support frame of the test trolley by using the test tool, the test trolley is clamped on the first guide rail and the second guide rail to slide, the three-pillar insulators are easily pushed to a test designated position, the test article is convenient to transport and dismount, and the work efficiency of workers in the voltage withstand partial discharge test can be obviously improved.
The test tool is large in size, high in manufacturing cost, large in occupied area and low in field utilization rate of a test room, and is very troublesome when a partial discharge test is carried out on the basis of the test tool.
Disclosure of Invention
The invention aims to provide a convenient partial discharge test method for an insulating part for a high-voltage switch.
In order to solve the technical problems, the technical scheme of the invention is as follows: a partial discharge test method for an insulating part for a high-voltage switch is characterized by comprising the following steps: comprises the following steps
S1 preparation before testing: firstly, according to the specification of an insulating part to be tested, preparing a special test tool required in the test, wherein the special test tool comprises
The test outer tank comprises a tank body, a support base connected with the bottom end of the tank body and an upper cover plate connected with the top end of the tank body, wherein double-layer sealing rings which are coaxially distributed inside and outside are arranged between the tank body and the support base as well as between the tank body and the upper cover plate;
the shielding assembly comprises an outer tank grounding end shielding ring arranged outside the supporting base, a pair of in-tank high-voltage crimping shielding ring and an inner tank grounding end shielding ring which are arranged in the tank body and are sequentially distributed from top to bottom, and a high-voltage outer side shielding ring sleeved on the outer side of the upper cover plate and covering the upper cover plate, wherein the bottom end of the in-tank grounding end shielding ring is supported at the upper end of the supporting base through an annular supporting table, a plurality of insulating cushion blocks are further arranged on the circumferential outer wall of the in-tank high-voltage crimping shielding ring, the insulating cushion blocks are uniformly distributed along the circumferential outer wall of the in-tank high-voltage crimping shielding ring, and the outer walls of the insulating cushion blocks are abutted against the inner wall of the tank body;
the insulation pull rod is arranged in a test cavity of the tank body, the insulation pull rod is arranged between a high-voltage crimping shielding ring in the tank and a grounding end shielding ring in the tank, a plurality of insulation pull rods are distributed on the upper end surface of the grounding end shielding ring in the tank in parallel, the bottom end of each insulation pull rod is connected with the grounding end shielding ring in the tank through a pull rod grounding end connecting block, the top end of each insulation pull rod is connected with the high-voltage crimping shielding ring in the tank through a pull rod high-voltage end connecting block, the outer side of the bottom end of each insulation pull rod is further sleeved with a pull rod grounding end shielding ring, and the outer wall of the top end of each insulation pull rod is further sleeved with a pull rod high-voltage end shielding ring;
cleaning the surfaces of all the components forming the special test tool, checking and cleaning the interior of the tank body, confirming the tidiness and cleanness of the inner wall of the tank body, and wiping the outer surface of the insulating pull rod;
s2, tool installation: fixing the insulating pull rod in the tank body, assembling all parts forming the special test tool to form an integral special test tool, and connecting the inflation valve with SF through the air supply pipeline 6 Connecting an air supply source, connecting a vacuumizing port with a vacuumizing pump through a vacuumizing pipeline, checking whether the connection of an insulating pull rod is reliable or not after the assembly is finished, and locking an inflation valve to ensure the sealing in a tank body after the connection is reliable;
s3, vacuumizing: after the tank body is completely sealed, opening a vacuum-pumping valve, starting a vacuum-pumping pump to work, carrying out vacuum-pumping treatment on the interior of the tank body, detecting the pressure of the interior of the tank body by using a pressure gauge, and keeping continuous vacuum-pumping for 10min until the vacuum degree in the tank body is less than 10Pa to reach a vacuum state;
s4 charging SF 6 Gas: closing the vacuum-pumping valve, opening the inflation valve, and filling SF into the tank 6 The gas reaches the required test air pressure, and after the test air pressure is reached, the inflation valve is closed and the mixture is kept stand for 10min to ensure that the SF is ensured 6 The gas can fill the whole gas chamber;
s5, withstand voltage and partial discharge test: butt-jointing a special test tool with a power frequency partial discharge test complete device, setting values of primary side overvoltage, primary side overcurrent, test article overvoltage and test article overcurrent of the power frequency partial discharge test complete device, starting the test, firstly, boosting the voltage to be 95kV of power frequency voltage resistance and keeping for 1min, then, reducing the voltage to 48.6kV and keeping for 30S, recording and analyzing data of 10-25S, then, reducing the voltage to 28.1kV and keeping for 30S, then, reducing the voltage to a zero position, finishing the test, and automatically recording the test data of the time by the power frequency partial discharge test complete device and generating a report;
s6, gas recovery: after the test is finished, the inflation valve is opened, and SF is recovered 6 Stopping recovering SF when the air pressure in the tank body is less than 10Pa 6 Closing the inflation valve, opening the air supply valve, and filling air into the tank body until the air pressure inside and outside the tank body is balanced;
s7, disassembling: confirming that no pressure exists in the tank body, opening the upper cover plate and the supporting base of the tank body, removing the insulating pull rod, detaching the insulating pull rod from the supporting base, cleaning the surface of the insulating pull rod, packaging and storing, and cleaning and storing each part of the special test tool for the next test.
Further, in the step S2, the item for checking whether the insulating pull rod is reliable includes connection of the insulating pull rod to a high-voltage crimping shielding ring in the tank, connection of the insulating pull rod to a pull rod grounding end connecting block and a pull rod high-voltage end connecting block, interconnection of components in the tank, and ground potential grounding connection.
Further, in the step S4, SF is performed 6 Before the air is filled, a layer of safety protection net needs to be arranged on the outer surface of the tank body.
Further, the installation of manometer does: install the fixed frame of a U-shaped manometer in the bottom of supporting the base, the upper end of the fixed frame of this manometer is passed through the bolt fastening on supporting the base, and has the waist shape through-hole that holds the bolt and pass and move about in the both sides of the fixed frame of manometer, the fixed frame of manometer forms the cavity that holds the manometer installation for one jointly between the base with supporting, installs a pull formula manometer sliding seat in this cavity, and this manometer sliding seat is an upper end open-ended hollow cuboid structure, still installs the leader in the outside of manometer sliding seat, and the manometer is arranged in the manometer sliding seat, still opens a pressure measurement mouth that cooperatees and use with the manometer on supporting the base, still install a relief valve on the manometer sliding seat.
Furthermore, the connecting block of the pull rod grounding end comprises a first connecting block and a second connecting block which are sequentially distributed from top to bottom, wherein a first mounting hole which vertically penetrates through the whole second connecting block is formed in the middle position of the second connecting block, a bolt penetrates through the shielding ring of the tank grounding end and then is fixed with the first mounting hole of the second connecting block in a threaded manner, so that the second connecting block is fixed, a notch which avoids the bottom of the insulating pull rod is formed in the upper position of the first connecting block, the first connecting block is made to be L-shaped, the first connecting block is connected with the bottom of the insulating pull rod through the bolt, a first positioning column which vertically extends downwards and is embedded into the first mounting hole is further formed in the bottom surface of the first connecting block, and meanwhile, a through hole which allows the first positioning column to penetrate through is further formed in the shielding ring of the pull rod grounding end.
The pull rod high-voltage end connecting block comprises a third connecting block, a fourth connecting block and a fifth connecting block which are sequentially distributed from top to bottom, wherein a second mounting hole which penetrates through the whole third connecting block from top to bottom is formed in the middle of the third connecting block, a bolt penetrates through a tank high-voltage compression shielding ring and then is fixed with the second mounting hole of the third connecting block in a threaded manner, so that the third connecting block is fixed, the fourth connecting block is of an inverted T-shaped structure formed by two cylindrical sections which are distributed from top to bottom and have different diameters, a second positioning column which is embedded into the second mounting hole of the third connecting block is further arranged at the top end of the fourth connecting block, a through hole which the second positioning column penetrates is further formed in the pull rod high-voltage end shielding ring, the fifth connecting block is of a semi-cylindrical shape, an inverted T-shaped groove which is embedded and installed in the fourth connecting block is formed in the side end of the upper position of the fifth connecting block, the fourth connecting block is embedded into the T-shaped groove and is connected with the fifth connecting block through a bolt, a groove which is formed in the lower position of the fifth connecting block, and a groove which is embedded into which the top end of the arc-shaped insulating pull rod is fixedly connected with the fifth connecting block is formed in the fifth connecting block.
Furthermore, the middle position of the upper end surface of the supporting base is also provided with a positioning ring which vertically extends upwards, and the positioning ring is attached to the inner wall of the supporting table.
The invention has the advantages that: the test method is based on a special test tool and is matched with preparation before the test, tool installation, vacuumizing and SF filling 6 The test device has the advantages that the requirements of space are reduced through procedures of gas, voltage-resisting partial discharge tests, gas recovery, disassembly and the like, the test is convenient, the whole programming is realized, the purpose of more convenient operation is realized for the electrical performance test of various test product insulating pieces, and the possibility of realization is provided for an unattended remote control system.
The design of arranging safety protection net, then protect the outer wall of jar body, improve whole experimentation's security.
To the design of the double-layer sealing ring arranged among the tank body, the supporting base and the upper cover plate, the defect that the air leakage of the conventional device does not reach the standard is avoided, and the annual air leakage rate of a new system is ensured to meet the standard regulation (less than or equal to 0.5%).
To the installation of manometer, adopt the fixed frame of manometer, the mutual cooperation between the manometer sliding seat to realized the movable mounting of manometer, need not to make things convenient for the installation and subsequent maintenance of manometer with the manometer snap-on supporting the base, and the design of the waist shape through-hole of the fixed frame both sides of manometer is then for the relative position between the fixed frame of convenience adjustment manometer and the support base, in order to adapt to different operating modes.
The installation of insulating pull rod adopts pull rod earthing terminal connecting block, the cooperation of pull rod high-voltage terminal connecting block is realized fixedly to carry out different connecting block combination complex modes to pull rod earthing terminal connecting block, pull rod high-voltage terminal connecting block respectively, thereby realized the elastic fixation of insulating pull rod, the effectual effective contact connection of having guaranteed insulating pull rod, both guaranteed highly compressed connection reliable, guaranteed ground connection's reliability again, thereby guaranteed that the test of putting reliably develops and accurate test.
The design of the positioning ring on the supporting base can position and limit the position of the supporting table, so that the sliding of an insulation test product to be tested in the tank body is avoided, and the smooth proceeding of the test is ensured.
The inside reasonable arrangement of barrel realizes the simulation of different insulating part operating modes when filling different insulating mediums to realize the electric property test.
By design, a high-voltage bushing in the traditional device is eliminated, the height of the whole system is reduced, the size is reduced, the weight is lightened, and the cost is reduced.
By introducing the epoxy insulation tank structure, the insulation performance is ensured, and the structural design of the tank body ensures the air pressure bearing capacity.
Through the design, the grounding tank body structure at the lower end of the traditional device is cancelled, the height is reduced, the size is reduced, the weight is lightened, and the cost is saved.
The test system provided by the invention has the advantages that through the mutual matching of the test outer tank, the shielding assembly and the test sample, the weight of the whole system is reduced, the volume is reduced, the cost is reduced, favorable conditions are created for realizing miniaturization, mobility and convenience in operation of the electrical test of the insulating part, and a brand-new choice is provided for improving the utilization of a laboratory site and promoting flexible production.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
Fig. 1 is a schematic diagram of a special test tool of the present invention.
Fig. 2 is a top view of the dedicated test tool of the present invention.
Fig. 3 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 2.
Fig. 4 is an enlarged schematic view of a portion B of fig. 3.
Fig. 5 is an enlarged schematic view of the portion C of fig. 3.
Detailed Description
The following examples will provide those skilled in the art with a more complete understanding of the present invention, but are not intended to limit the scope of the present invention to the examples.
The partial discharge test method of the insulating part for the high-voltage switch is realized by the following steps:
s1 preparation before testing: first, a dedicated test tool required for a test is prepared according to the specification of an insulating material to be tested.
As can be seen from the schematic diagrams shown in fig. 1-5, the special test tool includes a test outer tank, the test outer tank includes a tank 1, a supporting base 2 connected to the bottom end of the tank 1, and an upper cover plate 3 connected to the top end of the tank 1, the upper and lower sides of the tank 1 are both provided with a horizontal ring-shaped connecting section extending outward, so that the tank 1 is integrally i-shaped, the tank 1 is fixed to the supporting base 2 and the upper cover plate 3 by bolts, the tank 1 is further provided with double-layer sealing rings coaxially distributed from inside to outside in sequence between the supporting base 2 and the upper cover plate 3, and the design of the double-layer sealing rings arranged between the tank 1, the supporting base 2 and the upper cover plate 3 avoids the disadvantage that the air leakage rate of the conventional device does not reach the standard, and ensures that the annual air leakage rate of the new system meets the standard specification (less than or equal to 0.5%).
In this embodiment, jar body 1 is made by the epoxy material, has guaranteed insulating properties, satisfies the demand that reduces the height, lightens weight, supports base 2 and upper cover plate 3 and supports by steel to make support base 2 and upper cover plate 3 can satisfy the test strength demand.
Four movable rollers 4 are further mounted at the bottom end of the supporting base 2, and each movable roller 4 is a universal roller, so that movable movement in any direction can be met. To the removal roll 4 that supports 2 bottom designs of base, then be for the convenience personnel manual promotion entire system and remove, realize single transportation, facilitate for the commodity circulation turnover.
A plurality of lifting rings 18 are further arranged on the upper end surface of the upper cover plate 3, so that the upper cover plate 3 can be conveniently lifted and fixed with the tank body 1 by personnel.
The test tank is characterized in that a test cavity 32 for mounting a test sample is arranged in the tank body 1, an inflation valve port and an inflation port are arranged on the upper cover plate 3, an inflation valve 5 is arranged at the inflation valve port, the inflation valve 5 is communicated with the test cavity 32 in the tank body 1 to realize inflation in the test cavity 32, an inflation valve is arranged at the inflation valve port, a pressure gauge 6 is further arranged at the bottom end of the support base 2, a vacuumizing port communicated with the test cavity 32 is further connected to the bottom end of the support base 2, and a vacuumizing valve is arranged at the vacuumizing port.
The installation of manometer 6 does: install the fixed frame 8 of a U-shaped manometer in the bottom that supports base 2, the upper end of the fixed frame 8 of this manometer is passed through the bolt fastening on the bottom surface that supports base 2, and its solid specifically is: it has the screw thread through-hole with bolt matched with to open on supporting the base 2, and have the waist shape through-hole that holds the bolt and pass and move in the both sides of the fixed frame 8 of manometer, pass the waist shape through-hole on the fixed frame 8 of manometer and the screw thread through-hole screw-thread fit on supporting the base 2 through the bolt after, thereby the fixed frame 8 of manometer and the fixed of supporting the base 2 have been realized, to the design of the waist shape through-hole of the fixed frame 8 both sides of manometer, then be for the relative position between the fixed frame 8 of conveniently adjusting manometer and the supporting the base 2, in order to adapt to the installation demand of different operating modes.
Form the cavity that holds the installation of manometer 6 for one jointly between the fixed frame 8 of manometer and support base 2, install a pull formula manometer sliding seat 7 in this cavity, this manometer sliding seat 7 is an upper end open-ended hollow cuboid structure, still install the leader 9 in the outside of manometer sliding seat 7, in order to make things convenient for personnel pulling manometer sliding seat 7, manometer 6 is arranged in manometer sliding seat 7, still open one on supporting base 2 and cooperate the pressure measurement mouth that uses with manometer 6, still install a relief valve on manometer sliding seat 7. To the installation of manometer 6, adopt the fixed frame 8 of manometer, the mutually supporting between the manometer sliding seat 7, thereby realized the movable mounting of manometer 6, need not to fix manometer 6 snap-on supporting base 2, make things convenient for installation and subsequent maintenance of manometer 6, and the design of relief valve, then be in order to ensure whole test system's safety, when manometer 6 detects the pressure in jar body 1 too big, in time exhaust through opening the relief valve, in order to reach the purpose of step-down.
A shielding component, shielding component include one set up in the jar outer earthing terminal screening ring 10 that supports the base 2 outside, this jar outer earthing terminal screening ring 10 comprises a circular sheet metal and the annular screening ring of connection in the circumference outside of circular sheet metal jointly, wherein, circular sheet metal lies in the bottom surface that supports base 2 to and support and fix through bolted connection between the base 2, the annular screening ring lies in the circumference outside that supports base 2.
A pair of jar internal high pressure crimping shield ring 11 that sets up in jar body 1 and be the upper and lower distribution in proper order, jar internal ground terminal shield ring 12, jar internal high pressure crimping shield ring 11 comprises a circular bottom plate and the vertical annular plate that upwards extends along the circumferencial direction of circular bottom plate jointly, jar internal high pressure crimping shield ring 11's transversal is the U-shaped form, jar internal ground terminal shield ring 12 comprises a circular roof and the vertical annular plate that downwards extends along the circumferencial direction of circular roof jointly, jar internal ground terminal shield ring 12's transversal is the n shape, the bottom of jar internal ground terminal shield ring 12 supports in the upper end of supporting base 2 through an annular brace table 13, still open a plurality of circular lightening holes on brace table 13.
Still install several insulating pad 20 on the circumference outer wall of jar internal high pressure crimping shield ring 11, insulating pad 20 along jar internal high pressure crimping shield ring 11's circumference outer wall evenly distributed, insulating pad 20 is connected fixedly through the annular plate of screw with jar internal high pressure crimping shield ring 11, and the outer wall of insulating pad 20 supports on the inner wall of jar body 1. Through the design of insulating cushion 20, thereby effectively eliminate the insulating level between high-voltage terminal and the ground and have the risk that reduces and lead to insulation breakdown.
A positioning ring 14 extending vertically upwards is further arranged in the middle of the upper end face of the supporting base 2, the positioning ring 14 is attached to the inner wall of the supporting platform 13, and meanwhile, a second positioning ring 15 attached to the inner wall of the supporting platform 13 is also arranged on the bottom face of the shielding ring 12 at the inner end of the tank. The design of the positioning ring 14 on the supporting base 2 can position and limit the position of the supporting platform 13, and the design of the second positioning ring 15 is also used for positioning and limiting the relative position between the supporting platform 13 and the shielding ring 12 of the ground end in the tank, so that the sliding of the insulation test article to be tested in the tank body 1 is avoided, and the smooth proceeding of the test is ensured.
And the high-voltage outer side shielding ring 16 is sleeved on the outer side of the upper cover plate 3 and covers the upper cover plate 3, the high-voltage outer side shielding ring 16 is formed by a circular top plate and an annular plate vertically and downwardly extending along the circumferential direction of the circular top plate, the cross section of the high-voltage outer side shielding ring 16 is n-shaped, and the high-voltage outer side shielding ring 16 is fixed with the upper cover plate 3 through a connecting bolt.
The insulation pull rod 19 is installed in the test cavity 32 of the tank body 1, the insulation pull rod 19 is installed between the tank high-voltage crimping shielding ring 11 and the tank inner grounding end shielding ring 12, the insulation pull rod 19 is provided with a plurality of insulation pull rods which are distributed on the upper end surface of the tank inner grounding end shielding ring 12 in parallel, the bottom end of each insulation pull rod 19 is connected with the tank inner grounding end shielding ring 12 through a pull rod grounding end connecting block, the top end of each insulation pull rod 19 is connected with the tank inner high-voltage crimping shielding ring 11 through a pull rod high-voltage end connecting block, the outer side of the bottom end of each insulation pull rod 19 is further sleeved with a pull rod grounding end shielding ring 21, the outer wall of the top end of each insulation pull rod 19 is further sleeved with a pull rod high-voltage end shielding ring 22, the pull rod grounding end shielding ring 21 and the pull rod high-voltage end shielding ring 22 are identical in structure and are respectively formed by a circular plate and a ring-shaped shielding ring connected to the outer wall of the circumference of the circular plate, and the connecting position of the circular plate and the shielding ring is the middle position of the shielding ring.
As can be seen from the schematic diagram shown in fig. 4, the connecting block for the ground end of the pull rod includes a first connecting block 23 and a second connecting block 24 which are sequentially distributed from top to bottom, wherein a first mounting hole 25 which vertically penetrates through the whole second connecting block 24 is formed in the middle of the second connecting block 23, and is screwed with the first mounting hole 25 of the second connecting block 24 after a bolt penetrates through the shielding ring 12 for the ground end in the tank, so as to fix the second connecting block 24 and the shielding ring 12 for the ground end in the tank, a notch which avoids the bottom of the insulating pull rod 19 is formed in the upper portion of the first connecting block 23, so that the first connecting block 23 is in an L shape, the first connecting block 23 and the bottom of the insulating pull rod 19 are fixedly connected by the bolt, a first positioning column 26 which vertically extends downward and is embedded into the first mounting hole 25 is further formed in the bottom surface of the first connecting block 23, and a through hole which allows the first positioning column 26 to penetrate is further formed in the circular plate of the shielding ring 20 for the ground end of the pull rod, and the first connecting block 23 and the second connecting block 24 are movably positioned.
As can be seen from the schematic diagram shown in fig. 5, the tie rod high-voltage end connecting block includes a third connecting block 27, a fourth connecting block 28, and a fifth connecting block 29 which are sequentially distributed from top to bottom, wherein a second mounting hole 30 which vertically penetrates through the entire third connecting block 27 is formed in the middle of the third connecting block 27, a bolt penetrates through the in-tank high-voltage crimping shielding ring 11 and is then screwed into the second mounting hole 30 of the third connecting block 27, so that the third connecting block 27 and the in-tank high-voltage crimping shielding ring 11 are fixed, the fourth connecting block 28 has an inverted T-shaped structure formed by two cylindrical sections with different diameters which are distributed vertically, a second positioning column 31 which is embedded into the second mounting hole 30 of the third connecting block 27 is further formed at the top end of the fourth connecting block 28, a through hole which the second positioning column 31 penetrates is further formed on the circular plate of the tie rod high-voltage end shielding ring 11, the fifth connecting block 29 has a semi-cylindrical shape, an inverted T-shaped groove which is formed at the top end of the fifth connecting block 28 and is embedded into the fourth connecting block 28, and a through which the arc-shaped groove is embedded into the arc-shaped groove of the tie rod 19, and the tie rod is fixed at the top end of the tie rod 19, and the tie rod is formed by the bolt, and the arc-shaped groove 29, and the fifth connecting block 29, and the tie rod is inserted into the arc-shaped groove.
For the installation of the insulating pull rod 19, the pull rod grounding end connecting block and the pull rod high-voltage end connecting block are matched to realize fixation, and different connecting block combination and matching modes are respectively carried out on the pull rod grounding end connecting block and the pull rod high-voltage end connecting block, so that the elastic fixation of the insulating pull rod 19 is realized, the effective contact connection of the insulating pull rod 19 is effectively ensured, the reliable connection of high voltage is ensured, the reliable ground connection is also ensured, and the reliable development and accurate test of partial discharge test are ensured.
In this embodiment, pull rod earthing terminal connecting block, pull rod high-voltage end connecting block all adopt the light duralumin to make, and such design comes the different insulating part of supporting to connect, has lightened weight, has made things convenient for the equipment, has guaranteed the connection reliability through countersunk head threaded connection.
Cleaning the surfaces of all parts forming the special test tool, checking and cleaning the interior of the tank body, confirming the tidiness and cleanness of the inner wall of the tank body, and wiping the outer surface of the insulating pull rod clean;
s2, tool installation: fixing the insulating pull rod 19 in the tank body 1, assembling all parts forming the special test tool to form a complete special test tool, and connecting the inflation valve with SF through the air supply pipeline 6 The air supply source is connected, the vacuumizing port is connected with the vacuumizing pump through the vacuumizing pipeline, whether the connection of the insulating pull rod is reliable or not is checked after the assembly is finished, the air replenishing valve is connected with the air compressor through the air replenishing pipeline, and after the connection is reliable, the air charging valve, the air replenishing valve and the vacuumizing valve are closed, and the sealing in the tank body is ensured.
S3, vacuumizing: after the tank body is completely sealed, opening a vacuum-pumping valve, starting a vacuum-pumping pump to work, carrying out vacuum-pumping treatment on the interior of the tank body, detecting the pressure of the interior of the tank body by using a pressure gauge, and keeping continuous vacuum-pumping for 10min until the vacuum degree in the tank body is less than 10Pa, so as to achieve a vacuum state.
S4 charging SF 6 Gas: closing the vacuum-pumping valve, opening the inflation valve, and filling SF into the tank 6 The gas reaches the required test air pressure, and after reaching the test air pressure, the inflation valve is closed and kept stand for 10min to ensure SF 6 The gas can fill the entire gas chamber.
S5, withstand voltage and partial discharge test: the special test tool is connected with a power frequency partial discharge test complete device in a butt joint mode, the values of primary side overvoltage, primary side overcurrent, test article overvoltage and test article overcurrent of the power frequency partial discharge test complete device are set, the test is started, firstly, the voltage is increased to 95kV of power frequency withstand voltage and kept for 1min, then the voltage is reduced to 48.6kV and kept for 30S, the 10 th-25 th data is taken for recording and analyzing, then the voltage is reduced to 28.1kV and kept for 30S, then the voltage is reduced to zero, the test is finished, the power frequency partial discharge test complete device automatically records the test data and generates a report.
S6, gas recovery: after the test is finished, the inflation valve is opened, and SF is recovered 6 Stopping recovering SF when the air pressure in the tank body is less than 10Pa 6 And (4) closing the inflation valve, opening the air supply valve, and filling air into the tank body until the air pressure inside and outside the tank body is balanced.
S7, disassembling: confirming that no pressure exists in the tank body, opening the upper cover plate and the supporting base of the tank body, removing the insulating pull rod, detaching the insulating pull rod from the supporting base, cleaning the surface of the insulating pull rod, packaging and storing, and cleaning and storing each part of the special test tool for the next test.
The test method is based on a special test tool and is matched with preparation before the test, tool installation, vacuumizing and SF filling 6 The test device has the advantages that the requirements of space are reduced through procedures of gas, voltage-resisting partial discharge tests, gas recovery, disassembly and the like, the test is convenient, the whole programming is realized, the purpose of more convenient operation is realized for the electrical performance test of various test product insulating pieces, and the possibility of realization is provided for an unattended remote control system.
The insulating part assembling device realizes miniaturization (the area is about 1 square meter, the height is about 1.2 meters), occupies small space for a test room, occupies time similar to test time, and has remarkable effect of improving the field utilization rate of the test room.
The insulating part assembling device is light in weight (about 500 kg), single-person transportation is realized by arranging the rollers, and convenience is provided for logistics turnover.
The manufacturing cost of the insulating part assembling device is reduced, the manufacturing cost of a single set of the insulating part assembling device is about 4-8 thousands (the selection of accessories has influence, and is specifically determined by the interfaces, the length and the number of the accessory sets of the insulating parts), the price is proper, and the device has strong practicability for various enterprises which are limited by resources such as fields, cost and the like and have requirements in the aspect.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A partial discharge test method for an insulating part for a high-voltage switch is characterized by comprising the following steps: comprises the following steps
S1 preparation before testing: firstly, preparing a special test tool required in a test according to the specification of an insulating part to be tested, wherein the special test tool comprises a test outer tank, the test outer tank comprises a tank body, a supporting base connected with the bottom end of the tank body and an upper cover plate connected with the top end of the tank body, double-layer sealing rings which are coaxially distributed inside and outside are arranged between the tank body and the supporting base as well as between the tank body and the upper cover plate, a test cavity for mounting a test sample is arranged in the tank body, an inflation valve port and an inflation port are arranged on the upper cover plate, an inflation valve is arranged at the inflation valve port, an inflation valve is arranged at the inflation port, a pressure gauge is arranged at the bottom end of the supporting base, a vacuumizing port is arranged at the bottom end of the supporting base, and a vacuumizing valve is arranged at the vacuumizing port;
the shielding assembly comprises an outer tank grounding end shielding ring arranged outside the supporting base, a pair of in-tank high-voltage crimping shielding ring and an in-tank grounding end shielding ring which are arranged in the tank body and are sequentially distributed from top to bottom, and a high-voltage outer side shielding ring sleeved on the outer side of the upper cover plate and covering the upper cover plate, wherein the bottom end of the in-tank grounding end shielding ring is supported at the upper end of the supporting base through an annular supporting table, a plurality of insulating cushion blocks are further arranged on the circumferential outer wall of the in-tank high-voltage crimping shielding ring, the insulating cushion blocks are uniformly distributed along the circumferential outer wall of the in-tank high-voltage crimping shielding ring, and the outer walls of the insulating cushion blocks are abutted against the inner wall of the tank body;
the insulation pull rod is arranged in a test cavity of the tank body, the insulation pull rod is arranged between the in-tank high-voltage crimping shielding ring and the in-tank grounding end shielding ring, the insulation pull rods are distributed on the upper end surface of the in-tank grounding end shielding ring in parallel, the bottom end of each insulation pull rod is connected with the in-tank grounding end shielding ring through a pull rod grounding end connecting block, the top end of each insulation pull rod is connected with the in-tank high-voltage crimping shielding ring through a pull rod high-voltage end connecting block, the outer side of the bottom end of each insulation pull rod is further sleeved with a pull rod grounding end shielding ring, and the outer wall of the top end of each insulation pull rod is further sleeved with a pull rod high-voltage end shielding ring;
cleaning the surfaces of all parts forming the special test tool, checking and cleaning the interior of the tank body, confirming the tidiness and cleanness of the inner wall of the tank body, and wiping the outer surface of the insulating pull rod clean;
s2, tool installation: fixing an insulating pull rod in a tank body, assembling all parts forming the special test tool to form a complete special test tool, connecting an inflation valve with an SF6 gas supply source through a gas supply pipeline, connecting a vacuumizing port with a vacuumizing pump through a vacuumizing pipeline, checking whether the connection of the insulating pull rod is reliable or not after the assembly is finished, and locking the inflation valve to ensure the sealing in the tank body after the connection is reliable;
s3, vacuumizing: after the tank body is completely sealed, opening a vacuum-pumping valve, starting a vacuum-pumping pump to work, carrying out vacuum-pumping treatment on the interior of the tank body, detecting the pressure in the interior of the tank body by using a pressure gauge, and keeping continuous vacuum-pumping for 10min until the vacuum degree in the tank body is less than 10Pa, so as to achieve a vacuum state;
s4, filling SF6 gas: closing the vacuum pumping valve, opening the inflation valve, starting to fill SF6 gas into the tank body to the required test air pressure, closing the inflation valve after the test air pressure is reached, and standing for 10min to ensure that the whole air chamber can be filled with the SF6 gas;
s5, withstand voltage and partial discharge test: the special test tool is butted with a power frequency partial discharge test complete set, the values of primary side overvoltage, primary side overcurrent, test article overvoltage and test article overcurrent of the power frequency partial discharge test complete set are set, the test is started, firstly, the voltage is increased to 95kV power frequency withstand voltage and kept for 1min, then, the voltage is reduced to 48.6kV and kept for 30S, the 10 th-25 th data is taken for recording and analyzing, then, the voltage is reduced to 28.1kV and kept for 30S, then, the voltage is reduced to zero, the test is finished, the power frequency partial discharge test complete set automatically records the test data and generates a report;
s6, gas recovery: after the test is finished, opening an inflation valve, recovering SF6 gas, stopping recovering the SF6 gas when the air pressure in the tank body is less than 10Pa, closing the inflation valve, opening an air supply valve, and filling air into the tank body until the air pressure inside and outside the tank body is balanced;
s7, disassembling: confirming that no pressure exists in the tank body, opening the upper cover plate and the supporting base of the tank body, removing the insulating pull rod, detaching the insulating pull rod from the supporting base, cleaning the surface of the insulating pull rod, packaging and storing, and cleaning and storing each part of the special test tool for next test.
2. The partial discharge test method of the insulating member for a high-voltage switch according to claim 1, characterized in that: in the step S2, the item for checking whether the insulating pull rod is reliable includes connection of the insulating pull rod to a high-voltage crimping shielding ring in the tank, connection of the insulating pull rod to a pull rod grounding end connecting block and a pull rod high-voltage end connecting block, interconnection of components in the tank, and ground potential grounding connection.
3. The partial discharge test method of the insulating member for a high-voltage switch according to claim 1, characterized in that: in the step S4, before filling the SF6 gas, a layer of safety protection net needs to be arranged on the outer surface of the tank body.
4. The partial discharge test method of the insulating member for a high-voltage switch according to claim 1, characterized in that: the installation of manometer does: install the fixed frame of a U-shaped manometer in the bottom of supporting the base, the upper end of the fixed frame of this manometer is passed through the bolt fastening on supporting the base, and has the waist shape through-hole that holds the bolt and pass and move about in the both sides of the fixed frame of manometer, the fixed frame of manometer forms the cavity that holds the manometer installation for one jointly between the base with supporting, installs a pull formula manometer sliding seat in this cavity, and this manometer sliding seat is an upper end open-ended hollow cuboid structure, still installs the leader in the outside of manometer sliding seat, and the manometer is arranged in the manometer sliding seat, still opens a pressure measurement mouth that cooperatees and use with the manometer on supporting the base, still install a relief valve on the manometer sliding seat.
5. The partial discharge test method of the insulating member for a high-voltage switch according to claim 1, characterized in that: the pull rod grounding end connecting block comprises a first connecting block and a second connecting block which are sequentially distributed from top to bottom, wherein a first mounting hole which vertically penetrates through the whole second connecting block is formed in the middle position of the second connecting block, a bolt penetrates through the inner tank grounding end shielding ring and then is fixed with the first mounting hole of the second connecting block in a threaded mode, so that the second connecting block is fixed, a notch which avoids the bottom of the insulating pull rod is formed in the upper portion of the first connecting block, the first connecting block is made to be L-shaped, the bottom of the first connecting block is connected with the bottom of the insulating pull rod through the bolt, a first positioning column which vertically extends downwards and is embedded into the first mounting hole is further formed in the bottom surface of the first connecting block, and meanwhile, a through hole which allows the first positioning column to penetrate through is further formed in the pull rod grounding end shielding ring.
6. The partial discharge test method of the insulating member for a high-voltage switch according to claim 1, characterized in that: the connecting block at the high-voltage end of the pull rod comprises a third connecting block, a fourth connecting block and a fifth connecting block which are sequentially distributed from top to bottom, wherein a second mounting hole which penetrates through the whole third connecting block from top to bottom is formed in the middle position of the third connecting block, a bolt penetrates through a high-voltage pressure crimping shielding ring in the tank and then is fixed with the second mounting hole of the third connecting block in a threaded manner, so that the third connecting block is fixed, the fourth connecting block is of an inverted T-shaped structure formed by two cylindrical sections which are distributed from top to bottom and have different diameters, a second positioning column which is embedded into the second mounting hole of the third connecting block is further arranged at the top end of the fourth connecting block, a through hole which the second positioning column penetrates is further arranged on the high-voltage end shielding ring of the pull rod, the fifth connecting block is of a semi-cylindrical shape, an inverted T-shaped groove which is used for embedding and mounting the fourth connecting block is formed in the side end of the upper portion of the fifth connecting block, the fourth connecting block is embedded into the T-shaped groove and is connected with the fifth connecting block through a bolt, an arc-shaped groove is formed in the lower portion of the fifth connecting block, and an arc-shaped groove is fixedly connected with the fifth connecting block.
7. The partial discharge test method of the insulating member for a high-voltage switch according to claim 1, characterized in that: the middle position of the upper end face of the supporting base is also provided with a vertical positioning ring which extends upwards, and the positioning ring is attached to the inner wall of the supporting table.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002022790A (en) * | 2000-07-04 | 2002-01-23 | Hitachi Ltd | Partial discharge detecting device for gas insulating equipment |
| KR100883266B1 (en) * | 2007-06-11 | 2009-02-10 | 성균관대학교산학협력단 | SWNT-UHF Combined Sensor and Gas Insulated Switchgear Using the same |
| JP5374532B2 (en) * | 2011-03-25 | 2013-12-25 | 株式会社エクシム | Pre-mold insulator partial discharge test apparatus and pre-mold insulator partial discharge test method |
| CN203084146U (en) * | 2013-01-06 | 2013-07-24 | 江西省电力科学研究院 | SF6 gas insulation high voltage electrical apparatus-used insulating part partial discharge test device |
| CN103336259B (en) * | 2013-07-17 | 2016-08-31 | 国家电网公司 | The detecting system of local discharge of gas-insulator switchgear detection sensor and method |
| CN103837804A (en) * | 2014-02-27 | 2014-06-04 | 苏州华电电气股份有限公司 | Mobile gas insulation non-partial-discharge voltage holding test system |
| CN105277858B (en) * | 2015-10-12 | 2019-01-01 | 上海天灵开关厂有限公司 | A kind of pressure-resistant adapter of inner cone casing shelf depreciation test |
| CN105548823B (en) * | 2015-12-01 | 2018-02-09 | 武汉大学 | A kind of DC gas insulated local discharge of electrical equipment decomposes analogue experiment method |
| CN105388406B (en) * | 2015-12-29 | 2018-04-20 | 武汉大学 | A kind of gas insulated electric apparatus shelf depreciation multi-source associated detecting method |
| CN106841961B (en) * | 2017-04-19 | 2023-12-15 | 国网江苏省电力公司电力科学研究院 | Partial discharge measuring device for cable GIS terminal withstand voltage test |
| CN209560027U (en) * | 2018-12-26 | 2019-10-29 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of three support insulator pressure resistance local discharge test tooling of GIL equipment |
| CN111722066A (en) * | 2020-06-05 | 2020-09-29 | 武汉大学 | Method for testing partial discharge initial voltage of environment-friendly gas insulation medium |
| CN111551833B (en) * | 2020-06-12 | 2022-05-03 | 天津大学 | Cable buffer layer partial discharge test system under extremely inhomogeneous electric field |
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