CN107728026A - Insulation print to cable carries out the device of electric breakdown test - Google Patents
Insulation print to cable carries out the device of electric breakdown test Download PDFInfo
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- CN107728026A CN107728026A CN201711024484.3A CN201711024484A CN107728026A CN 107728026 A CN107728026 A CN 107728026A CN 201711024484 A CN201711024484 A CN 201711024484A CN 107728026 A CN107728026 A CN 107728026A
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- 238000009413 insulation Methods 0.000 title claims abstract description 113
- 230000015556 catabolic process Effects 0.000 title claims abstract description 72
- 238000012360 testing method Methods 0.000 title claims abstract description 72
- 230000005540 biological transmission Effects 0.000 claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims description 40
- 230000000149 penetrating effect Effects 0.000 claims description 19
- 230000009471 action Effects 0.000 claims description 11
- 230000000712 assembly Effects 0.000 claims description 10
- 238000000429 assembly Methods 0.000 claims description 10
- 235000012431 wafers Nutrition 0.000 description 54
- 238000010292 electrical insulation Methods 0.000 description 6
- 229920003020 cross-linked polyethylene Polymers 0.000 description 5
- 239000004703 cross-linked polyethylene Substances 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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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
- G01R31/20—Preparation of articles or specimens to facilitate testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention provides the device that a kind of insulation print to cable carries out electric breakdown test, the device includes：Oil groove, lid, first electrode and second electrode and conveyer and linkage；First electrode is oppositely arranged with second electrode and has pre-determined distance, and first electrode is connected with the bottom wall of oil groove, and second electrode is used to be connected with voltage generator；Conveyer is used to make slideably to be arranged between first electrode and second electrode in the insulation print of film state, and stops transmission insulation print when puncture place is placed between first electrode and second electrode when insulation print；Linkage is connected with second electrode, for driving second electrode to move, when insulation print is when puncture place is placed between first electrode and second electrode so that second electrode is located in insulation print with first electrode.The present invention realizes automatically and continuously respectively treats that puncture place carries out electric breakdown test successively to insulation print, and without manually participating in.
Description
Technical Field
The invention relates to the technical field of insulating property, in particular to a device for performing an electrical breakdown test on an insulating sample of a cable.
Background
In order to analyze the insulation properties of crosslinked polyethylene cables, it is common practice to: preparing an insulation sample wafer with a certain thickness on an insulation layer of the crosslinked polyethylene cable, and measuring the thickness of the insulation sample wafer by using a thickness meter. And applying voltage to the electrode by using a power frequency voltage device, carrying out an electrical breakdown test on the insulating sample in the insulating oil by using the electrode, counting the breakdown voltage value of the insulating sample, and calculating the breakdown field strength of the insulating sample by combining the thickness measured by the insulating sample. And analyzing the insulation characteristics of the crosslinked polyethylene cable according to the breakdown field intensity. The calculated breakdown voltage values are different depending on the form of the electrodes.
In an actual test operation, the insulation layer of the crosslinked polyethylene cable is usually sliced a plurality of times to obtain a plurality of insulation sample sheets, and then each insulation sample sheet is subjected to an electrical breakdown test to calculate a breakdown voltage value corresponding to each insulation sample sheet. Therefore, the worker needs to sequentially place each insulation sample in the device for the electrical breakdown test, and needs to replace one insulation sample with another insulation sample to continue the electrical breakdown test after the electrical breakdown test of the insulation sample is completed, so that the electrical breakdown test cannot be continuously performed on each insulation sample, and the electrical insulation characteristic of the cable insulation layer cannot be comprehensively and continuously reflected. Moreover, when the insulation sample wafer is replaced, manual operation of workers is needed, so that more workers participate, and the test result is prone to deviation.
Disclosure of Invention
In view of this, the invention provides a device for performing an electrical breakdown test on insulation sample wafers of a cable, and aims to solve the problems that the electrical breakdown test cannot be continuously performed on a plurality of insulation sample wafers and the test results are easily affected by more manual participation in the prior art.
The invention provides a device for carrying out an electrical breakdown test on an insulation sample wafer of a cable, which comprises: the device comprises an oil tank, a cover body connected with the oil tank in an openable and closable manner, a first electrode and a second electrode which are arranged in the oil tank, a conveying device and a linkage device; the first electrode and the second electrode are oppositely arranged and have a preset distance, the first electrode is connected with the bottom wall of the oil tank, and the second electrode is used for being connected with a voltage generator arranged outside the oil tank; the conveying device is used for enabling the insulation sample in a film state to slidably penetrate between the first electrode and the second electrode, and stopping conveying the insulation sample when the position to be punctured of the insulation sample is arranged between the first electrode and the second electrode; the linkage device is connected with the second electrode and used for driving the second electrode to move, and when the position to be punctured of the insulating sample wafer is arranged between the first electrode and the second electrode, the second electrode and the first electrode are clamped on the insulating sample wafer.
Further, in the apparatus for performing an electrical breakdown test on an insulation sample of a cable, the transfer device includes: the driving mechanism, the driving wheel and the driven wheel; the cover body is provided with a first penetrating port and a second penetrating port, and the first penetrating port and the second penetrating port respectively correspond to two sides of the second electrode; the first end of the insulation sample piece is wound on the driven wheel, the insulation sample piece sequentially and slidably penetrates through the first penetrating opening, the gap between the first electrode and the second penetrating opening, and the second end of the insulation sample piece is wound on the driving wheel; the driving mechanism is connected with the driving wheel and used for driving the driving wheel to rotate, driving the insulation sample wafer to slidably penetrate through a gap between the first electrode and the second electrode, and stopping driving the driving wheel to rotate when the position, to be punctured, of the insulation sample wafer is arranged between the first electrode and the second electrode.
Further, in the apparatus for performing an electrical breakdown test on an insulation sample of a cable, the transfer apparatus further includes: a guide mechanism; the guide mechanism is arranged in the oil groove and used for guiding the insulation sample wafer so that the insulation sample wafer is arranged in a gap between the first electrode and the second electrode.
Further, in the above apparatus for performing an electrical breakdown test on an insulation sample of a cable, the guide mechanism includes: two guide assemblies; wherein, two direction subassemblies all are connected with the diapire of oil groove to, the both sides of first electrode are arranged respectively in to two direction subassemblies, and, every direction subassembly all corresponds to the clearance department between first electrode and the second electrode.
Further, in the above apparatus for performing an electrical breakdown test on an insulation sample of a cable, each guide assembly comprises: the device comprises a base, a first guide part, a second guide part and two blocking parts; the base is connected with the bottom wall of the oil groove, and the top surface of the base and a gap between the first electrode and the second electrode are positioned on the same plane; the first end of the first guide piece is connected with the base, the first end of the second guide piece is connected with the base in a position-adjustable manner, the second guide piece is used for adjusting a gap between the second guide piece and the first guide piece, and the gap is used for enabling the insulation sample wafer to pass through; the two blocking pieces are respectively connected with the second end of the first guide piece and the second end of the second guide piece in a one-to-one correspondence mode.
Further, in the above apparatus for performing an electrical breakdown test on an insulation sample of a cable, each of the guide assemblies further includes: a guide rail; the guide rail is connected to the base, a sliding block is arranged at the first end of the second guide piece, and the sliding block is connected with the guide rail in a sliding mode.
Furthermore, in the device for performing the electrical breakdown test on the insulating sample wafer of the cable, the linkage device is connected with the driving wheel, and the linkage device is used for driving the second electrode to move under the driving of the driving wheel, and when the position to be broken of the insulating sample wafer is arranged between the first electrode and the second electrode, the second electrode moves to clamp the insulating sample wafer with the first electrode.
Further, in the above apparatus for performing an electrical breakdown test on an insulation sample of a cable, the interlocking device includes: the transmission rod, the connecting rod and the cam mechanism; the connecting rod is slidably arranged in the cover body in a penetrating mode, part of the connecting rod is arranged in the oil groove, the first end of the connecting rod is connected with the second electrode, and the second end of the connecting rod is connected with the voltage generator; the first end of the transmission rod is connected with the driving wheel, and the second end of the transmission rod is connected with the connecting rod through the cam mechanism.
Further, the device for performing the electrical breakdown test on the insulation sample of the cable further comprises: an elastic member; the elastic piece is sleeved on the part of the connecting rod, which is arranged in the oil groove, and is arranged between the second electrode and the cover body.
Furthermore, in the device for performing the electrical breakdown test on the insulation sample wafer of the cable, the driving mechanism is a driving motor.
In the invention, by arranging the insulation sample wafer in a film state, compared with the prior art that the insulation sample wafer is in a sheet state, the electrical breakdown test can be continuously carried out on the insulation sample wafer, the transmission device can automatically transmit the insulation sample wafer so that the positions to be broken down of the insulation sample wafer are sequentially arranged between the first electrode and the second electrode, the linkage device can clamp the insulation sample wafer between the first electrode and the second electrode, the electrical breakdown test is convenient to carry out, the automatic and continuous electrical breakdown test for the positions to be broken down of the insulation sample wafer is realized, the comprehensive analysis of the electrical insulation performance of the cable insulation layer can be further comprehensively and continuously carried out, the manual participation is not needed, compared with the prior art that the electrical breakdown test is carried out on the insulation sample wafers sequentially, the inconsistency of each operation is greatly reduced, and the deviation of the contact degree between the electrodes and the insulation sample wafer and the like during each test is reduced, the accuracy of the electrical breakdown test result is effectively improved, the accuracy of analysis of the electrical insulation performance of the cable insulation layer is further ensured, and the problems that in the prior art, electrical breakdown tests cannot be continuously carried out on a plurality of insulation sample wafers, and more manual work is involved, and the test result is easily influenced are solved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of an apparatus for performing an electrical breakdown test on an insulation sample of a cable according to an embodiment of the present invention;
fig. 2 is a schematic top view of an oil groove in an apparatus for performing an electrical breakdown test on an insulation sample of a cable according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a guide assembly in an apparatus for performing an electrical breakdown test on an insulation sample of a cable according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an apparatus for performing an electrical breakdown test on an insulation sample of a cable according to an embodiment of the present invention. As shown, the apparatus for electrical breakdown testing may include: an oil tank 1, a cover 2, a first electrode 3, a second electrode 4, a conveyor 6 and a linkage 7. Wherein, oil groove 1 is a hollow shell in inside, has been filled with insulating oil in the inside of oil groove 1. The top of the oil tank 1 is provided with a cover body 2, and the cover body 2 is connected with the oil tank 1 in an openable manner.
The first electrode 3 and the second electrode 4 are both disposed in the oil bath 1, and are disposed in a central portion of the oil bath 1. The first electrode 3 is disposed opposite to the second electrode 4, and a predetermined distance is provided between the first electrode 3 and the second electrode 4. The first electrode 3 is connected to the bottom wall of the oil sump 1 such that the first electrode 3 is fixed relative to the oil sump 1, i.e. the first electrode 3 remains stationary. The first electrode 3 is connected to a ground electrode, so that the first electrode 3 is grounded. The second electrode 4 is arranged above the first electrode 3 (with respect to fig. 1), the second electrode 4 being adapted to be connected to a voltage generator 5 arranged outside the oil bath 1, the voltage generator 5 being adapted to apply a high voltage to the second electrode 4. Specifically, the second electrode 4 is connected to the voltage generator 5 through a high voltage lead, and the second electrode 4 is suspended in the oil tank 1. The voltage generator 5 may be a high voltage generator. In specific implementation, the preset distance between the first electrode 3 and the second electrode 4 may be determined according to actual situations, and this embodiment does not limit this.
The transport device 6 is used for slidably passing the insulating sample 8 in a film state between the first electrode 3 and the second electrode 4, and stopping transporting the insulating sample 8 when the position to be punctured of the insulating sample 8 is placed between the first electrode 3 and the second electrode 4. Specifically, the transport device 6 is used to transport the insulating sample 8, the insulating sample 8 being in a film state, i.e., being continuously cut spirally from the insulating layer of the cable, so that the cut insulating sample 8 is in a continuous long state, similar to a film, and the thickness of the insulating sample 8 is kept the same. The insulation sample wafer 8 is slidably disposed through the oil tank 1 and partially disposed inside the oil tank 1. In the oil groove 1, the insulating sample wafer 8 is arranged in the gap between the first electrode 3 and the second electrode 4, and is slidably inserted through the gap, and finally penetrates through the oil groove 1 to be arranged outside the oil groove 1. The insulating sample 8 continuously passes through the gap between the first electrode 3 and the second electrode 4 under the conveying action of the conveying device 6. When the position to be punctured of the insulating sample 8 is placed between the first electrode 3 and the second electrode 4, the transfer device 6 stops transferring the insulating sample 8, and the insulating sample 8 stops moving.
In a specific implementation, the cable may be a crosslinked polyethylene cable, or may be another cable, which is not limited in this embodiment.
The linkage device 7 is connected with the second electrode 4, the linkage device 7 is used for driving the second electrode 4 to move, and when the position to be punctured of the insulating sample wafer 8 is arranged between the first electrode 3 and the second electrode 4, the second electrode 4 and the first electrode 3 are clamped on the insulating sample wafer 8. Specifically, the second electrode 4 is driven by the linkage 7 to move toward the first electrode 3 (downward in fig. 1) to make the gap between the first electrode 3 and the second electrode 4 smaller, and also move away from the first electrode 3 (upward in fig. 1) to make the gap between the first electrode 3 and the second electrode 4 larger. When the position to be punctured of the insulating sample 8 is placed between the first electrode 3 and the second electrode 4, the insulating sample 8 stops moving. The linkage device 7 drives the second electrode 4 to move towards the first electrode 3, and then the gap between the first electrode 3 and the second electrode 4 becomes smaller so as to clamp the insulating sample wafer 8 in a stopped state. At this time, the voltage generator 5 may apply a high voltage to the second electrode 4 to break down the insulation sample 8. After the insulating sample 8 is broken down, the conveying device 6 continues to convey the insulating sample 8, and the linkage device 7 drives the second electrode 4 to move away from the first electrode 3, so that the gap between the first electrode 3 and the second electrode 4 is enlarged, and the insulating sample 8 can conveniently pass through.
The linkage 7 can be connected with the conveying device 6, and the linkage 7 drives the second electrode 4 to move under the driving of the conveying device 6.
In specific implementation, the position to be punctured of the insulation sample wafer 8 can be determined by predetermining the moving distance of the insulation sample wafer 8, and after the first position to be punctured of the insulation sample wafer 8 is punctured, the second position to be punctured is reached after the preset moving distance is moved. Or, the position of the insulation sample 8 for performing the electrical breakdown test may be determined in advance, and after the first position to be broken of the insulation sample 8 is broken, the insulation sample 8 is moved to the second position to be broken of the insulation sample 8, and then the electrical breakdown test is performed on the insulation sample 8. The present embodiment does not set any limit to the determination of the position to be punctured of the insulating sample 8.
The working process is as follows: in the initial state, the gap between the first electrode 3 and the second electrode 4 is large, the insulating sample 8 in a film state penetrates through the oil groove 1 and penetrates through the gap between the first electrode 3 and the second electrode 4, and the insulating sample 8 is connected with the conveying device 6. The transfer device 6 transfers the insulating sample 8 so that the insulating sample 8 passes through the gap between the first electrode 3 and the second electrode 4. The linkage device 7 drives the second electrode 4 to move, when the position to be punctured of the insulation sample wafer 8 is arranged between the first electrode 3 and the second electrode 4, the conveying device 6 stops conveying the insulation sample wafer 8, the second electrode 4 moves towards the first electrode 3, and the second electrode 4 just moves to a position where a gap between the second electrode 4 and the first electrode 3 is small so as to clamp the insulation sample wafer 8. The voltage generator 5 applies high voltage to the second electrode 4, and performs an electrical breakdown test on the position to be broken down of the insulation sample 8 under the combined action of the second electrode 4 and the first electrode 3 to obtain a breakdown voltage value, and further calculates the breakdown field strength corresponding to the position. At this time, the conveying device 6 continues to convey the insulating sample 8, when the next position to be punctured of the insulating sample 8 is placed between the first electrode 3 and the second electrode 4, the conveying of the insulating sample 8 is stopped, the insulating sample 8 is clamped, an electrical breakdown test is carried out, and the corresponding breakdown field strength at the position is calculated. And repeating the processes in sequence, performing breakdown tests on a plurality of positions to be broken down of the insulation sample wafer 8 to obtain breakdown field strengths corresponding to the positions, and further analyzing the insulation characteristics of the cable.
It can be seen that, in this embodiment, by providing the insulating sample 8 in a film state, compared with the prior art in which the insulating sample is in a sheet-by-sheet state, the electrical breakdown test can be continuously performed on the insulating sample 8, and the conveying device 6 can automatically convey the insulating sample 8 so that the positions to be broken of the insulating sample 8 are sequentially placed between the first electrode 3 and the second electrode 4, and the linking device 7 can clamp the insulating sample 8 between the first electrode 3 and the second electrode 4, thereby facilitating the electrical breakdown test, realizing that the electrical breakdown test can be automatically and continuously performed on the positions to be broken of the insulating sample 8, further comprehensively and continuously performing the comprehensive analysis on the electrical insulation performance of the cable insulating layer, and without manual intervention, compared with the prior art in which the electrical breakdown test is performed on the insulating samples sequentially, the inconsistency of operation at every turn is greatly reduced, the deviation of contact degree and the like between the electrode and the insulation sample wafer during the test at every turn is reduced, the accuracy of the electric breakdown test result is effectively improved, the accuracy of the electric insulation performance analysis of the cable insulation layer is further ensured, and the problems that in the prior art, the electric breakdown test cannot be continuously carried out on a plurality of insulation sample wafers, and the test result is easily influenced due to more manual participation are solved.
With continued reference to fig. 1, in the above embodiment, the transfer device 6 may include: a drive mechanism 61, a drive pulley 62 and a driven pulley 63. Wherein, the lid 2 has been seted up first mouthful 21 and the second of wearing to establish and has worn to establish mouthful 22, and first mouthful 21 and the second of wearing to establish is worn to establish mouthful 22 and is parallel arrangement, and first mouthful 21 and the second of wearing to establish is worn to establish mouthful 22 and all is used for supplying wearing to establish of insulating sample wafer 8. The first through hole 21 and the second through hole 22 respectively correspond to two sides of the second electrode 4, and specifically, the first through hole 21 and the second through hole 22 are respectively disposed at two sides of the second electrode 4 (with respect to fig. 1), so that the insulation sample wafer 8 enters the oil tank 1 through the first through hole 21 and then passes through the oil tank 1 through the second through hole 22.
The length of the first through hole 21 is greater than or equal to the width of the insulating sample 8, and preferably, the length of the first through hole 21 matches with the width of the insulating sample 8. The length of the second through hole 22 is greater than or equal to the width of the insulating sample 8, and preferably, the length of the second through hole 22 matches with the width of the insulating sample 8. The longitudinal direction of the first penetration hole 21 and the longitudinal direction of the second penetration hole 22 are both parallel to the width direction of the oil groove 1 (the direction perpendicular to the paper surface in fig. 1).
The first end (the right end shown in fig. 1) of the insulation sample 8 is wound around the driven wheel 63, the insulation sample 8 sequentially and slidably penetrates through the first penetrating opening 21, the gap between the first electrode 3 and the second electrode 4 and the second penetrating opening 22, and the second end (the left end shown in fig. 1) of the insulation sample 8 is wound around the driving wheel 62. Specifically, the insulation sample 8 is arranged in a "U" shape in the oil groove 1.
The driving mechanism 61 is connected to the driving wheel 62, and the driving mechanism 61 is configured to drive the driving wheel 62 to rotate, so as to drive the insulating sample 8 to slidably penetrate through a gap between the first electrode 3 and the second electrode 4, and stop driving the driving wheel 62 to rotate when a position to be punctured of the insulating sample 8 is placed between the first electrode 3 and the second electrode 4. Specifically, because the both ends of insulating sample 8 are respectively around locating action wheel 62 and following driving wheel 63, so, action wheel 62 rotates under actuating mechanism 61's drive effect, drives insulating sample 8 and slides to action wheel 62 department, and then drives and rotate from driving wheel 63 for from driving wheel 63 release insulating sample 8, insulating sample 8 slides along first wear to establish mouthful 21, the clearance between first electrode 3 and the second electrode 4 and second wear to establish mouthful 22 in proper order, and is around locating action wheel 62. When one of the positions to be punctured of the insulating sample 8 is placed between the first electrode 3 and the second electrode 4, the driving motor stops driving the driving wheel 62 to rotate, and the insulating sample 8 stops moving.
Preferably, the driving mechanism 61 is a driving motor, and a driving shaft of the driving motor is connected with the driving wheel 62. In specific implementation, the electrical breakdown testing apparatus may further include: and a motor controller 10, wherein the motor controller 10 is connected with the driving motor, and the motor controller 10 is used for controlling the rotation and stop of the driving motor.
It can be seen that, in this embodiment, the driving wheel 62 is driven by the driving mechanism 61 to rotate to drive the insulating sample wafer 8 to penetrate through the gap between the first electrode 3 and the second electrode 4, so that the automatic transmission of the insulating sample wafer 8 is realized, the structure is simple, the implementation is convenient, and the transmission of the insulating sample wafer 8 can be effectively controlled.
In the above embodiment, the transfer device 6 may further include: a guide mechanism. Wherein, guiding mechanism sets up in oil groove 1, and guiding mechanism is used for leading to insulating sample 8 to make insulating sample 8 arrange in the clearance between first electrode 3 and second electrode 4. Specifically, the guide mechanism guides the insulating sample 8 placed in the oil bath 1 so as to guide the insulating sample 8 just into the gap between the first electrode 3 and the second electrode 4. Like this, can make insulating sample 8 accurately wear to establish by the clearance department between first electrode 3 and the second electrode 4 through setting up guiding mechanism, avoid insulating sample 8 skew to appear, and then guaranteed that the position of waiting to puncture of insulating sample 8 just in time arranges in between first electrode 3 and the second electrode 4, be convenient for carry out the electric breakdown test, improved the accuracy of puncture test result effectively.
Referring to fig. 1-3, a preferred construction of the guide mechanism is shown. As shown, in the above embodiment, the guide mechanism may include: two guide assemblies 64. Wherein, two guide assemblies 64 all are connected with the diapire of oil groove 1 to, two guide assemblies 64 are arranged in the both sides of first electrode 3 respectively. Specifically, the two guide assemblies 64 are respectively disposed on the left and right (with respect to fig. 1) sides of the first electrode 3, and the guide assembly 64 disposed on the right side of the first electrode 3 guides the insulating sample 8 penetrated through the first penetration hole 21 so that the insulating sample 8 is conveyed to the gap between the first electrode 3 and the second electrode 4. The guide assembly 64 disposed at the left side of the first electrode 3 guides the insulating sample 8 penetrating through the gap between the first electrode 3 and the second electrode 4, so that the insulating sample 8 is conveyed to the second penetrating port 22.
Each guide member 64 corresponds to the gap between the first electrode 3 and the second electrode 4, i.e. the guide plane of each guide member 64 corresponds to the gap between the first electrode 3 and the second electrode 4, so that the insulating sample 8 is just guided into the gap between the first electrode 3 and the second electrode 4.
It can be seen that, in this embodiment, by providing two guiding assemblies 64, it can be effectively ensured that the insulating sample 8 accurately penetrates through the gap between the first electrode 3 and the second electrode 4, and it is further ensured that the position to be punctured of the insulating sample 8 is exactly placed at the gap.
With continued reference to fig. 1-3, in the above-described embodiments, each guide assembly may include: a base 641, a first guide 642, a second guide 643 and two stops 644. Wherein, base 641 is connected with the bottom wall of oil groove 1, specifically, the bottom wall of base 641 can be connected with the bottom wall of oil groove 1 through the connecting piece. The top surface of the base 641 is in the same plane as the gap between the first electrode 3 and the second electrode 4, so that the insulating sample 8 is just led into the gap between the first electrode 3 and the second electrode 4.
A first end (lower end shown in fig. 3) of the first guide 642 is connected to the base 641, a first end (lower end shown in fig. 3) of the second guide 643 is connected to the base 641 in a position-adjustable manner, and the second guide 643 is used for adjusting a gap for passing the insulating sample 8 with respect to the first guide 642. Specifically, the first end of the first guide 642 and the first end of the second guide 643 are both disposed on the top surface of the base 641. The first guide 642 and the second guide 643 are disposed opposite to each other on the base 641 such that a gap between the first guide 642 and the second guide 643 is used for passing the insulating sample 8. Also, the gap between the first guide 642 and the second guide 643 corresponds to the gap between the first electrode 3 and the second electrode 4.
Two stoppers 644 are connected to the second end (upper end shown in fig. 3) of the first guide 642 and the second end (upper end shown in fig. 3) of the second guide 643 in one-to-one correspondence, respectively. Specifically, each of the stoppers 644 may have a rectangular parallelepiped shape. Referring to fig. 3, the width of the blocking member 644 at the second end of the first guide member 642 is greater than that of the first guide member 642, so that the first guide member 642 and the blocking member 644 form an inverted "L" shape to limit the position of the insulation sample 8. Accordingly, the width of the stopper 644 at the second end of the second guide 643 is greater than the width of the second guide 643, so that the second guide 643 and the stopper 644 also form an inverted "L" shape.
It can be seen that, in the present embodiment, the insulating sample 8 can be guided by the gap between the first guide 642 and the second guide 643 for passing through the insulating sample 8, so that the insulating sample 8 can be better conveyed to the gap between the first electrode 3 and the second electrode 4 or to the second through hole 22, and the position of the second guide 643 on the base 641 can be adjusted to adjust the gap between the second guide 643 and the first guide 642, so as to better adapt to insulating samples 8 with different widths, thereby improving the application range, and the two stoppers 644 can block the insulating sample 8, limit the insulating sample 8 in the gap between the second guide 643 and the first guide 642, and prevent the insulating sample 8 from being separated from the guide assembly 64.
Referring to fig. 3, in the above embodiment, the first end of the first guiding element 642 is fixedly connected to the base 641, such as by welding, which is not limited in this embodiment. There are many ways to adjustably connect the second guide 643 with the base 641, and this embodiment is not limited thereto, and only one of them is described in this embodiment, but not limited to this structure: each guide assembly 64 further comprises: a guide rail. The guide rail is connected to the base 641, and a first end of the second guide 643 is provided with a slider, and the slider is slidably connected to the guide rail. Specifically, a guide rail may be provided at a position of the base 641 corresponding to the second guide 643, or the guide rail may be entirely laid on the base 641. In order to prevent the sliding block from sliding out of the guide rail, a limiting member may be disposed at an end of the guide rail away from the first guide 642, and the limiting member limits the sliding block to prevent the sliding block from separating from the guide rail.
In an implementation, a locking assembly may be further provided, and the locking assembly is configured to lock the second guide 643 after determining the gap between the second guide 643 and the first guide 642, so as to prevent the second guide 643 from sliding. In a specific implementation, the locking assembly may be a bolt, and the second guide 643 is fixed by tightening the bolt, which may be determined according to actual situations, and this embodiment does not limit this.
It can be seen that in the present embodiment, the guide rail is disposed on the base 641, so that the second guide 643 and the base 641 are connected in a position-adjustable manner, and the gap between the first guide 642 and the second guide 643 can be better adjusted, so that the insulating sample wafers 8 with different widths can be adapted, and the applicability of the apparatus for electrical breakdown test is improved.
Referring to fig. 1, in the above embodiments, the linkage device 7 is connected to the driving wheel 62, and the linkage device 7 is configured to drive the second electrode 4 to move under the driving of the driving wheel 62, and when the position to be punctured of the insulating sample 8 is located between the first electrode 3 and the second electrode 4, the second electrode 4 moves to clamp the insulating sample 8 with the first electrode 3. Specifically, the driving wheel 62 is driven by the driving mechanism 61 to rotate, so as to drive the linkage device 7 to move, the linkage device 7 drives the second electrode 4 to move, when the position to be punctured of the insulating sample 8 is to be placed between the first electrode 3 and the second electrode 4, the second electrode 4 just moves towards the first electrode 3, and when the position to be punctured of the insulating sample 8 is placed between the first electrode 3 and the second electrode 4, the gap between the second electrode 4 and the first electrode 3 just clamps the insulating sample 8.
The linkage 7 may include: a transmission rod 71, a connecting rod 72 and a cam mechanism 73. The connecting rod 72 is slidably disposed through the cover 2 and partially disposed in the oil tank 1, a first end (a lower end shown in fig. 1) of the connecting rod 72 is connected to the second electrode 4, and a second end (an upper end shown in fig. 1) of the connecting rod 72 is connected to the voltage generator 5 through a high-voltage lead. Specifically, the cover 2 is provided with a through hole, the connecting rod 72 slidably penetrates through the through hole, and a part of the connecting rod 72 is disposed inside the oil tank 1 and a part of the connecting rod is disposed outside the oil tank 1.
A first end (a lower end shown in fig. 1) of the transmission rod 71 is connected with the driving wheel 62, a second end (an upper end shown in fig. 1) of the transmission rod 71 is connected with the connecting rod 72 through a cam mechanism 73, and the driving wheel 62 is used for driving the transmission rod 71 to rotate under the action of the driving mechanism 61, so as to drive the cam mechanism 73 to move, so that the connecting rod 72 drives the second electrode 4 to move. Specifically, the cam mechanism 73 is connected to a portion of the connecting rod 72 disposed outside the oil sump 1.
It will be appreciated by those skilled in the art that the cam mechanism 73 is a conventional structure for converting rotational motion to linear motion. The cam mechanism 73 includes: the oil tank comprises a cam, a push rod 731 and a frame, wherein the rotation of the cam drives the push rod 731 to move linearly, and the push rod 731 is connected with a part of the connecting rod 72, which is arranged outside the oil tank 1.
During operation, the rotation of the driving wheel 62 drives the rotation of the transmission rod 71, and further drives the rotation of the cam in the cam mechanism 73, so that the push rod 731 can move up and down (relative to fig. 1), and since the push rod 731 is connected with the connection rod 72, the push rod 731 drives the connection rod 72 to move up and down, and further drives the second electrode 4 to move up and down, that is, the second electrode 4 can move away from the first electrode 3 or move towards the first electrode 3, so that the gap between the first electrode 3 and the second electrode 4 becomes larger or smaller. After an electrical breakdown test is performed on a position to be broken through of the insulation sample 8, the driving wheel 62 rotates to drive the insulation sample 8 to move leftward (relative to fig. 1), and meanwhile, the rotation of the driving wheel 62 drives the connecting rod 72 to move through the transmission rod 71 and the cam mechanism 73, so that the connecting rod 72 is always in a state of moving up and down. Although the second electrode 4 moves downwards when the connecting rod 72 moves downwards, so that the gap between the first electrode 3 and the second electrode 4 becomes smaller to clamp the insulating sample wafer 8, the driving wheel 62 rotates continuously, the cam rotates continuously, the connecting rod 72 also moves upwards continuously, so that the gap between the first electrode 3 and the second electrode 4 becomes larger to release the insulating sample wafer 8, the above movement process is repeated, until the next position to be punctured of the insulating sample wafer 8 is placed between the first electrode 3 and the second electrode 4, the driving wheel 62 stops rotating, so that the insulating sample wafer 8 stops moving leftwards, the corresponding cam mechanism 73 also stops moving, the connecting rod 72 also stops moving, and at this time, the gap between the first electrode 3 and the second electrode 4 just becomes smaller to clamp the insulating sample wafer 8.
It can be seen that, in this embodiment, the linkage device 7 is driven by the driving wheel 62 to move, so that the uniform movement can be effectively realized, the structure is simple, and the implementation is convenient.
With continued reference to fig. 1, in the above embodiment, the apparatus for electrical breakdown testing may further include: an elastic member 9. The elastic element 9 is sleeved on the portion of the connecting rod 72 disposed in the oil tank 1 and disposed between the second electrode 4 and the cover 2. Specifically, the elastic element 9 is sleeved on the connecting rod 72 in a compressed state. When the second electrode 4 moves towards the first electrode 3, the elastic element 9 is in a compressed state; when the second electrode 4 is moved away from the first electrode 3, the elastic member 9 is still compressed but is compressed more tightly. The elastic member 9 may be a spring.
It can be seen that, in this embodiment, by providing the elastic member 9, when the second electrode 4 moves towards the first electrode 3, the gap between the second electrode 4 and the first electrode 3 can be made smaller under the action of the elastic force of the elastic member 9, and the insulating sample 8 disposed between the second electrode 4 and the first electrode 3 is better sandwiched, so that the contact between the insulating sample 8 and the second electrode 4 and the first electrode 3 is tighter, and the voltage generator 5 applies a voltage to the insulating sample 8 through the second electrode 4 to break down.
In conclusion, the present embodiment enables the insulating sample pieces 8 to be continuously subjected to the electrical breakdown test, and, the insulating sample 8 can be automatically conveyed by the conveying device 6 so that each position to be punctured of the insulating sample 8 is sequentially placed between the first electrode 3 and the second electrode 4, the insulating sample 8 can be clamped between the first electrode 3 and the second electrode 4 through the linkage device 7, the electric breakdown test of each position to be broken down of the insulating sample 8 can be automatically and continuously carried out in sequence, furthermore, the comprehensive analysis of the electrical insulation performance of the cable insulation layer can be comprehensively and continuously carried out, manual participation is not needed, the inconsistency of each operation is greatly reduced, the deviation of the contact degree between the electrode and the insulation sample wafer and the like in each test is reduced, the accuracy of the electrical breakdown test result is effectively improved, and the accuracy of the analysis of the electrical insulation performance of the cable insulation layer is further ensured.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An apparatus for performing an electrical breakdown test on an insulation coupon for a cable, comprising: the device comprises an oil tank (1), a cover body (2) which is connected with the oil tank (1) in an openable and closable manner, a first electrode (3) and a second electrode (4) which are arranged in the oil tank (1), a conveying device (6) and a linkage device (7); wherein,
the first electrode (3) and the second electrode (4) are arranged oppositely and have a preset distance, the first electrode (3) is connected with the bottom wall of the oil tank (1), and the second electrode (4) is used for being connected with a voltage generator (5) arranged outside the oil tank (1);
the conveying device (6) is used for enabling an insulating sample wafer (8) in a film state to be slidably arranged between the first electrode (3) and the second electrode (4) in a penetrating mode, and when the position to be punctured of the insulating sample wafer (8) is placed between the first electrode (3) and the second electrode (4), conveying of the insulating sample wafer (8) is stopped;
the linkage device (7) is connected with the second electrode (4) and used for driving the second electrode (4) to move, and when the position to be punctured of the insulation sample wafer (8) is arranged between the first electrode (3) and the second electrode (4), the second electrode (4) and the first electrode (3) are clamped on the insulation sample wafer (8).
2. Device for performing an electrical breakdown test on a sample insulation of an electrical cable according to claim 1, characterized in that said transfer means (6) comprise: a driving mechanism (61), a driving wheel (62) and a driven wheel (63); wherein,
the cover body (2) is provided with a first penetrating opening (21) and a second penetrating opening (22), and the first penetrating opening (21) and the second penetrating opening (22) respectively correspond to two sides of the second electrode (4);
the first end of the insulation sample wafer (8) is wound on the driven wheel (63), the insulation sample wafer (8) sequentially penetrates through the first penetrating opening (21), the gap between the first electrode (3) and the second electrode (4) and the second penetrating opening (22) in a sliding manner, and the second end of the insulation sample wafer (8) is wound on the driving wheel (62);
actuating mechanism (61) with action wheel (62) are connected for the drive action wheel (62) rotate, drive insulating sample piece (8) wear to locate slidable first electrode (3) with clearance between second electrode (4), and work as the position of waiting to puncture of insulating sample piece (8) is arranged in when first electrode (3) with between second electrode (4), the stop drive action wheel (62) rotate.
3. Device for performing an electrical breakdown test on a sample insulation of an electrical cable according to claim 2, characterized in that said transfer means (6) further comprise: a guide mechanism; wherein,
the guide mechanism is arranged in the oil groove (1) and used for guiding the insulation sample wafer (8), so that the insulation sample wafer (8) is arranged in a gap between the first electrode (3) and the second electrode (4).
4. An apparatus for performing an electrical breakdown test on a sample insulation of a cable according to claim 3, wherein the guiding mechanism comprises: two guide assemblies (64); wherein,
the two guide assemblies (64) are connected with the bottom wall of the oil groove (1), the two guide assemblies (64) are respectively arranged on two sides of the first electrode (3), and each guide assembly (64) corresponds to the gap between the first electrode (3) and the second electrode (1).
5. Device for performing an electrical breakdown test on a sample insulation of an electrical cable according to claim 4, characterized in that each guide assembly (64) comprises: a base (641), a first guide (642), a second guide (643) and two stops (644); wherein,
the base (641) is connected with the bottom wall of the oil groove (1), and the top surface of the base (641) and the gap between the first electrode (3) and the second electrode (4) are in the same plane;
a first end of the first guide (642) is connected with the base (641), a first end of the second guide (643) is connected with the base (641) in a position-adjustable manner, the second guide (643) is used for adjusting a gap between the first guide (642) and the second guide, and the gap is used for enabling the insulating sample wafer (8) to pass through;
the two stoppers (644) are respectively connected to the second ends of the first guide (642) and the second guide (643) in a one-to-one correspondence.
6. An apparatus for performing an electrical breakdown test on a sample insulation of a cable according to claim 5, wherein each guide assembly (64) further comprises: a guide rail; wherein,
the guide rail is connected to the base (641), and a first end of the second guide (643) is provided with a slider slidably connected to the guide rail.
7. The device for performing an electrical breakdown test on an insulation sample wafer of a cable according to claim 2, wherein the linkage device (7) is connected to the driving wheel (62), and the linkage device (7) is configured to drive the second electrode (4) to move under the driving of the driving wheel (62), and when the position to be broken of the insulation sample wafer (8) is placed between the first electrode (3) and the second electrode (4), the second electrode (4) is moved to clamp the insulation sample wafer (8) with the first electrode (3).
8. Device for performing an electrical breakdown test on a sample insulation of an electrical cable according to claim 7, characterized in that said linkage (7) comprises: a transmission rod (71), a connecting rod (72) and a cam mechanism (73); wherein,
the connecting rod (72) is slidably arranged in the cover body (2) in a penetrating manner and is partially arranged in the oil groove (1), the first end of the connecting rod (72) is connected with the second electrode (4), and the second end of the connecting rod (72) is connected with the voltage generator (5);
the first end of the transmission rod (71) is connected with the driving wheel (62), and the second end of the transmission rod (71) is connected with the connecting rod (72) through the cam mechanism (73).
9. An apparatus for performing an electrical breakdown test on a sample insulation of a cable according to claim 8, further comprising: an elastic member (9); wherein,
the elastic piece (9) is sleeved on the connecting rod (72) and arranged in the oil groove (1) and between the second electrode (4) and the cover body (2).
10. Device for performing an electrical breakdown test on a sample insulation of a cable according to claim 2, characterized in that the driving mechanism (61) is a driving motor.
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| CN201711024484.3A CN107728026B (en) | 2017-10-27 | 2017-10-27 | Device for carrying out electric breakdown test on insulation sample wafer of cable |
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| CN201711024484.3A CN107728026B (en) | 2017-10-27 | 2017-10-27 | Device for carrying out electric breakdown test on insulation sample wafer of cable |
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| CN108872804A (en) * | 2018-04-28 | 2018-11-23 | 海南电网有限责任公司电力科学研究院 | A kind of device to discharge for detecting solid insulation |
| CN110488170A (en) * | 2019-08-21 | 2019-11-22 | 哈尔滨理工大学 | A kind of electrode system for plate insulation sample breakdown test |
| CN111007367A (en) * | 2019-12-18 | 2020-04-14 | 安徽复兴电缆集团有限公司 | Withstand voltage detection device of cable |
| CN111398747A (en) * | 2020-03-10 | 2020-07-10 | 广州启光智造技术服务股份有限公司 | Method for detecting use safety of marine cable |
| CN113608075A (en) * | 2021-06-21 | 2021-11-05 | 深圳供电局有限公司 | Insulation performance testing device |
| CN113740682A (en) * | 2021-09-06 | 2021-12-03 | 华中科技大学 | Experimental method for simulating cable insulation breakdown under ocean dynamics |
| CN113759222A (en) * | 2021-09-06 | 2021-12-07 | 华中科技大学 | Method for observing structure and defects of dynamically aged insulation layer of marine cable |
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| CN111398747A (en) * | 2020-03-10 | 2020-07-10 | 广州启光智造技术服务股份有限公司 | Method for detecting use safety of marine cable |
| CN113608075A (en) * | 2021-06-21 | 2021-11-05 | 深圳供电局有限公司 | Insulation performance testing device |
| CN113608075B (en) * | 2021-06-21 | 2023-12-29 | 深圳供电局有限公司 | Insulation performance testing device |
| CN113740682A (en) * | 2021-09-06 | 2021-12-03 | 华中科技大学 | Experimental method for simulating cable insulation breakdown under ocean dynamics |
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