CN107728026B - Device for carrying out electric breakdown test on insulation sample wafer of cable - Google Patents
Device for carrying out electric breakdown test on insulation sample wafer of cable Download PDFInfo
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- CN107728026B CN107728026B CN201711024484.3A CN201711024484A CN107728026B CN 107728026 B CN107728026 B CN 107728026B CN 201711024484 A CN201711024484 A CN 201711024484A CN 107728026 B CN107728026 B CN 107728026B
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- 230000015556 catabolic process Effects 0.000 title claims abstract description 73
- 238000012360 testing method Methods 0.000 title claims abstract description 73
- 238000009413 insulation Methods 0.000 title claims abstract description 49
- 230000007246 mechanism Effects 0.000 claims description 40
- 230000000149 penetrating effect Effects 0.000 claims description 33
- 230000005540 biological transmission Effects 0.000 claims description 11
- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 8
- 235000012431 wafers Nutrition 0.000 description 33
- 230000009471 action Effects 0.000 description 5
- 229920003020 cross-linked polyethylene Polymers 0.000 description 5
- 239000004703 cross-linked polyethylene Substances 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000002354 daily effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000035515 penetration Effects 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
-
- 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 a device for carrying out an electrical breakdown test on an insulation sample of a cable, which comprises: the device comprises an oil groove, a cover body, a first electrode, a second electrode, a conveying device and a linkage device; the first electrode is arranged opposite to the second electrode and has a preset distance, the first electrode is connected with the bottom wall of the oil groove, and the second electrode is used for being connected with the voltage generator; the conveying device is used for enabling the insulating sample sheet in a film state to be slidably penetrated between the first electrode and the second electrode, and stopping conveying the insulating sample sheet when the position to be broken down of the insulating sample sheet is arranged between the first electrode and the second electrode; the linkage device is connected with the second electrode and is used for driving the second electrode to move, and when the position to be broken down 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. The invention realizes the automatic and continuous electric breakdown test of each position to be broken down of the insulating sample wafer without manual participation.
Description
Technical Field
The invention relates to the technical field of insulating performance, in particular to a device for carrying out an electric breakdown test on an insulating sample wafer of a cable.
Background
In order to analyze the insulation properties of crosslinked polyethylene cables, it is common practice to: and preparing an insulating sample wafer with a certain thickness on the insulating layer of the crosslinked polyethylene cable, and measuring the thickness of the insulating sample wafer by using a thickness meter. And then applying voltage to the electrode by using a power frequency voltage device, carrying out an electric breakdown test on the insulating sample wafer in insulating oil by the electrode, counting the breakdown voltage value of the insulating sample wafer, and calculating the breakdown field intensity of the insulating sample wafer by combining the thickness measured by the insulating sample wafer. The insulation properties of the crosslinked polyethylene cable were analyzed in terms of the breakdown field strength. Wherein the electrode forms are different, and the calculated breakdown voltage values are also different.
In actual test operation, a plurality of insulating sample pieces are obtained by slicing the insulating layer of the crosslinked polyethylene cable for a plurality of times, then, electric breakdown tests are respectively carried out on each insulating sample piece, and the breakdown voltage value corresponding to each insulating sample piece is calculated. Therefore, the worker needs to place each insulating sample in the device for the electrical breakdown test in sequence, and after the electrical breakdown test is completed by one insulating sample, the electrical breakdown test needs to be continued by replacing another insulating sample, so that the electrical breakdown test cannot be continuously performed on each insulating sample, and the electrical insulation characteristics of the cable insulating layer cannot be fully and continuously reflected. Moreover, when the insulating sample is replaced, manual operation is required by a worker, so that more labor is involved, and deviation of test results is easy to occur.
Disclosure of Invention
In view of the above, the invention provides a device for carrying out an electrical breakdown test on insulating sample pieces of a cable, and aims to solve the problems that in the prior art, electrical breakdown tests cannot be continuously carried out on a plurality of insulating sample pieces, and the test results are easily affected due to more manual participation.
The invention provides a device for carrying out an electrical breakdown test on an insulation sample of a cable, which comprises: the oil tank, the cover body which is connected with the oil tank in an openable way, a first electrode and a second electrode which are arranged in the oil tank, and 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 groove, and the second electrode is used for being connected with a voltage generator arranged outside the oil groove; the conveying device is used for enabling the insulating sample sheet in a film state to be slidably penetrated between the first electrode and the second electrode, and stopping conveying the insulating sample sheet when the position to be broken down of the insulating sample sheet is arranged between the first electrode and the second electrode; the linkage device is connected with the second electrode and is used for driving the second electrode to move, and when the position to be broken down 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 apparatus includes: the driving mechanism, the driving wheel and the driven wheel; the cover body is provided with a first penetrating opening and a second penetrating opening, and the first penetrating opening and the second penetrating opening respectively correspond to two sides of the second electrode; the first end of the insulating sample piece is wound on the driven wheel, the insulating 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 insulating sample piece is wound on the driving wheel; the driving mechanism is connected with the driving wheel and is used for driving the driving wheel to rotate, driving the insulating sample wafer to slidably penetrate through the gap between the first electrode and the second electrode, and stopping driving the driving wheel to rotate when the position to be broken down of the insulating 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 guiding mechanism is arranged in the oil groove and used for guiding the insulating sample wafer so that the insulating sample wafer is arranged in a gap between the first electrode and the second electrode.
Further, in the above-described apparatus for performing an electrical breakdown test on an insulation sample of a cable, the guide mechanism includes: two guide assemblies; wherein, two direction subassembly all are connected with the diapire of oil groove to, two direction subassembly are arranged in the both sides of first electrode respectively, and every direction subassembly all corresponds 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 of the guide members includes: the device comprises a base, a first guide piece, a second guide piece and two blocking pieces; the base is connected with the bottom wall of the oil groove, and the top surface of the base and the 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 mode, 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 to pass through; the two blocking pieces are respectively connected with the second ends of the first guide piece and the second end of the second guide piece in a one-to-one correspondence manner.
Further, in the 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, the first end of the second guide piece is provided with a sliding block, and the sliding block is connected with the guide rail in a sliding mode.
Further, in the device for carrying out the electric breakdown test on the insulating sample piece of the cable, the linkage device is connected with the driving wheel, 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 down of the insulating sample piece is arranged between the first electrode and the second electrode, the second electrode moves to clamp the insulating sample piece with the first electrode.
Further, in the above-mentioned device for performing an electrical breakdown test on an insulation sample of a cable, the linkage device includes: the device comprises a transmission rod, a connecting rod and a cam mechanism; the connecting rod is slidably arranged in the cover body in a penetrating way and is partially 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 an electrical breakdown test on an insulation sample of a cable further includes: an elastic member; the elastic piece is sleeved on the connecting rod, is arranged on the part in the oil groove and is arranged between the second electrode and the cover body.
Further, in the above-described apparatus for performing an electrical breakdown test on an insulating sample of a cable, the driving mechanism is a driving motor.
According to the invention, the insulating sample sheet in a film state is arranged, compared with the insulating sample sheet in a sheet state in the prior art, the insulating sample sheet can be used for continuously carrying out an electric breakdown test, the insulating sample sheet can be automatically conveyed through the conveying device, so that each position to be broken down of the insulating sample sheet is sequentially arranged between the first electrode and the second electrode, the insulating sample sheet can be clamped between the first electrode and the second electrode through the linkage device, the electric breakdown test is convenient, the electric breakdown test is automatically and continuously carried out on each position to be broken down of the insulating sample sheet in sequence, the comprehensive analysis of the electric insulation performance of the cable insulating layer can be comprehensively and continuously carried out, and the artificial participation is not needed, compared with the electric breakdown test is carried out on each insulating sample sheet in sequence in the prior art, the inconsistency of each operation is greatly reduced, the deviation of the contact degree and the like between the electrode and the insulating sample sheet in each test is reduced, the accuracy of the electric breakdown test result is effectively improved, the electric breakdown test result is easy to carry out, the electric breakdown test result is easily and the problem that the electric breakdown test result cannot be continuously carried out on the insulating sample sheet in the prior art is more is 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 designate like parts throughout the figures. 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 a device 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, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
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: the oil tank 1, the cover body 2, the first electrode 3, the second electrode 4, the conveying device 6 and the linkage 7. Wherein, the oil groove 1 is a shell with a hollow inside, and the inside of the oil groove 1 is filled with insulating oil. The top of the oil groove 1 is provided with a cover body 2, and the cover body 2 is connected with the oil groove 1 in an openable and closable manner.
The first electrode 3 and the second electrode 4 are both disposed in the oil groove 1, and are disposed in a central portion of the oil groove 1. The first electrode 3 is disposed opposite to the second electrode 4 with a predetermined distance 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 relatively fixed to the oil sump 1, i.e., the first electrode 3 is kept stationary. The first electrode 3 is connected to the ground electrode, so that the first electrode 3 is grounded. The second electrode 4 is disposed above the first electrode 3 (with respect to fig. 1), the second electrode 4 being adapted to be connected to a voltage generator 5 disposed outside the oil sump 1, the voltage generator 5 being adapted to apply a high voltage to the second electrode 4. Specifically, the second electrode 4 is connected with the voltage generator 5 through a high-voltage lead, and then the second electrode 4 is suspended in the oil groove 1. The voltage generator 5 may be a high voltage generator. In practical implementation, the preset distance between the first electrode 3 and the second electrode 4 may be determined according to practical situations, which is not limited in this embodiment.
The conveying device 6 is used for enabling the insulating sample sheet 8 in a film state to be slidably arranged between the first electrode 3 and the second electrode 4 in a penetrating manner, and stopping conveying the insulating sample sheet 8 when the position to be broken down of the insulating sample sheet 8 is arranged between the first electrode 3 and the second electrode 4. Specifically, the conveying device 6 is used for conveying the insulating sample sheet 8, the insulating sample sheet 8 is in a film state, that is, is continuously spirally cut from the insulating layer of the cable, so that the cut insulating sample sheet 8 is in a continuous strip state similar to a film, and the thickness of the insulating sample sheet 8 remains the same. The insulating sample sheet 8 is slidably inserted into the oil groove 1 and partially disposed inside the oil groove 1. Inside the oil groove 1, an insulating sheet 8 is placed at the gap between the first electrode 3 and the second electrode 4, and slidably penetrates from the gap, and finally penetrates out of the oil groove 1 to be placed outside the oil groove 1. The insulating sheet 8 is continuously passed through the gap between the first electrode 3 and the second electrode 4 by the transfer action of the transfer device 6. When the position to be broken down of the insulating dummy 8 is placed between the first electrode 3 and the second electrode 4, the transfer device 6 stops transferring the insulating dummy 8, and the insulating dummy 8 stops moving.
In the 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, and the linkage device 7 is used for driving the second electrode 4 to move, and when the position to be broken down 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. Specifically, the second electrode 4 may move toward the first electrode 3 (downward in fig. 1) under the driving of the linkage 7 to reduce the gap between the first electrode 3 and the second electrode 4, or may move away from the first electrode 3 (upward in fig. 1) to increase the gap between the first electrode 3 and the second electrode 4. When the position to be broken down of the insulating dummy 8 is placed between the first electrode 3 and the second electrode 4, the insulating dummy 8 stops moving. The linkage 7 drives the second electrode 4 to move towards the first electrode 3, so that the gap between the first electrode 3 and the second electrode 4 is reduced, and the insulating sample wafer 8 in a stop state is clamped. At this time, the voltage generator 5 may apply a high voltage to the second electrode 4 to break down the insulating sample 8. After the insulating sample 8 is broken down, the conveying device 6 continues to convey the insulating sample 8, and then the linkage device 7 drives the second electrode 4 to move away from the first electrode 3 so that a gap between the first electrode 3 and the second electrode 4 is enlarged, and the insulating sample 8 can conveniently pass through.
The linkage device 7 can be connected with the conveying device 6, and the linkage device 7 drives the second electrode 4 to move under the driving of the conveying device 6.
In a specific implementation, the position to be broken down of the insulating sample 8 may be determined by determining a moving distance of the insulating sample 8 in advance, and then after the first position to be broken down of the insulating sample 8 breaks down, the second position to be broken down is reached after moving by a preset moving distance. The position of the insulating sample 8 to be subjected to the electrical breakdown test may be determined in advance, and after the first position of the insulating sample 8 to be broken down is broken down, the insulating sample 8 is subjected to the electrical breakdown test after moving to the second position of the insulating sample 8 to be broken down. The present embodiment does not impose any limitation on the determination of the position to be broken down of the insulating dummy 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 sheet 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 sheet 8 is connected with the conveying device 6. The transfer device 6 transfers the insulating sheet 8 such that the insulating sheet 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 broken down of the insulating sample wafer 8 is arranged between the first electrode 3 and the second electrode 4, the conveying device 6 stops conveying the insulating sample wafer 8, the second electrode 4 moves towards the first electrode 3, and the second electrode 4 just moves to a position with a smaller gap between the second electrode 4 and the first electrode 3 so as to clamp the insulating 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 insulating sample wafer 8 under the combined action of the second electrode 4 and the first electrode 3 to obtain a breakdown voltage value, so as to calculate the corresponding breakdown field intensity at the position. At this time, the conveying device 6 continues to convey the insulating sample 8, and when the next position to be broken down 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 electric breakdown test is performed, and the breakdown field intensity corresponding to the position is calculated. And repeating the above processes in sequence, performing breakdown tests on a plurality of positions to be broken down of the insulation sample wafer 8, obtaining the corresponding breakdown field intensity at each position, and further analyzing the insulation characteristic of the cable.
It can be seen that, in this embodiment, through setting up insulating sample 8 that is the film state, compare insulating sample 8 in prior art and be a slice, can make insulating sample 8 carry out electric breakdown test in succession, and, can make insulating sample 8 automatic conveying so that insulating sample 8's each position of waiting to break down is placed in proper order between first electrode 3 and second electrode 4, can make insulating sample 8 press from both sides and locate between first electrode 3 and second electrode 4 through linkage 7, be convenient for carry out electric breakdown test, realized carrying out electric breakdown test in proper order to insulating sample 8's each position of waiting to break down automatically and continuously, and then can carry out comprehensive analysis to the electric insulation performance of cable insulation layer in succession comprehensively, and, need not artifical the participation, compare in the prior art with carrying out electric breakdown test in proper order to each insulating sample, the inconsistency of each operation has been greatly reduced, contact degree etc. between electrode and the insulating sample at every time has been reduced, the accuracy of electric breakdown test result is improved effectively, and then the electric breakdown test result's the accuracy of electric insulation sample 8 is more to the electric insulation test is carried out to the electric insulation performance of insulating sample 8 in proper order, and the continuous test result of insulating test of insulating sample has been solved in the manual analysis has more can's the continuous test problem.
With continued reference to fig. 1, in the above embodiment, the conveying device 6 may include: 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, the first penetrating opening 21 and the second penetrating opening 22 are arranged in parallel, and the first penetrating opening 21 and the second penetrating opening 22 are both used for penetrating the insulation sample wafer 8. The first penetrating opening 21 and the second penetrating opening 22 respectively correspond to two sides of the second electrode 4, specifically, the first penetrating opening 21 and the second penetrating opening 22 are respectively disposed on two sides of the second electrode 4 (relative to fig. 1), so that the insulating sample wafer 8 enters the oil groove 1 from the first penetrating opening 21, and then penetrates the oil groove 1 from the second penetrating opening 22.
The length of the first through hole 21 is equal to or greater than the width of the insulating sheet 8, and preferably, the length of the first through hole 21 matches the width of the insulating sheet 8. The length of the second through hole 22 is equal to or greater than the width of the insulating sheet 8, and preferably, the length of the second through hole 22 matches the width of the insulating sheet 8. The longitudinal direction of the first penetrating opening 21 and the longitudinal direction of the second penetrating opening 22 are parallel to the width direction (the direction perpendicular to the paper surface in fig. 1) of the oil groove 1.
The first end (right end shown in fig. 1) of the insulating sample 8 is wound around the driven wheel 63, the insulating sample 8 is sequentially slidably inserted through the first insertion hole 21, the gap between the first electrode 3 and the second electrode 4, and the second insertion hole 22, and the second end (left end shown in fig. 1) of the insulating sample 8 is wound around the driving wheel 62. Specifically, the insulating pattern 8 is arranged in a "U" shape in the oil groove 1.
The driving mechanism 61 is connected with the driving wheel 62, the driving mechanism 61 is used for driving the driving wheel 62 to rotate, driving the insulating sample 8 to slidably penetrate through the gap between the first electrode 3 and the second electrode 4, and stopping driving the driving wheel 62 to rotate when the position to be broken down of the insulating sample 8 is placed between the first electrode 3 and the second electrode 4. Specifically, since the two ends of the insulating sample 8 are respectively wound around the driving wheel 62 and the driven wheel 63, the driving wheel 62 rotates under the driving action of the driving mechanism 61, so as to drive the insulating sample 8 to slide toward the driving wheel 62, and further drive the driven wheel 63 to rotate, so that the driven wheel 63 releases the insulating sample 8, and the insulating sample 8 slides along the first penetrating opening 21, the gap between the first electrode 3 and the second electrode 4, and the second penetrating opening 22 in sequence, and is wound around the driving wheel 62. When one of the insulating sample 8 to be broken down is placed between the first electrode 3 and the second electrode 4, the driving motor stops driving the driving wheel 62 to rotate, and then 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 to the driving wheel 62. In particular, the apparatus for electrical breakdown testing 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 8 to penetrate from the gap between the first electrode 3 and the second electrode 4, so that automatic conveying of the insulating sample 8 is realized, the structure is simple, the implementation is convenient, and the conveying of the insulating sample 8 can be effectively controlled.
In the above embodiment, the conveying device 6 may further include: and a guide mechanism. Wherein, guiding mechanism sets up in oil groove 1, and guiding mechanism is used for carrying out the direction to insulating dailies 8 to make insulating dailies 8 place in the clearance between first electrode 3 and the second electrode 4. Specifically, the guide mechanism guides the insulating dummy 8 placed in the oil bath 1 so as to guide the insulating dummy 8 just into the gap between the first electrode 3 and the second electrode 4. Like this, can make insulating sample wafer 8 accurately worn by the clearance department between first electrode 3 and the second electrode 4 through setting up guiding mechanism, avoid insulating sample wafer 8 to appear the skew, and then guaranteed insulating sample wafer 8 wait to break down the position just in time and place between first electrode 3 and the second electrode 4, be convenient for carry out electric breakdown test, improved the accuracy of breakdown test result effectively.
Referring to fig. 1 to 3, a preferred construction of the guide mechanism is shown. As shown in the figures, in the above embodiment, the guide mechanism may include: two guide assemblies 64. Wherein, two guide assemblies 64 are connected with the bottom wall of the oil sump 1, and the two guide assemblies 64 are disposed at both sides of the first electrode 3, respectively. Specifically, two guiding members 64 are disposed on the left and right sides (with respect to fig. 1) of the first electrode 3, respectively, and the guiding members 64 disposed on the right side of the first electrode 3 guide the insulating sample sheet 8 penetrated through the first penetrating opening 21 so that the insulating sample sheet 8 is conveyed to the gap between the first electrode 3 and the second electrode 4. The guide member 64 disposed at the left side of the first electrode 3 guides the insulating sheet 8 penetrated from the gap between the first electrode 3 and the second electrode 4 so that the insulating sheet 8 is conveyed to the second penetration hole 22.
Each guide member 64 corresponds to a gap between the first electrode 3 and the second electrode 4, i.e. the guide plane of each guide member 64 corresponds to a gap between the first electrode 3 and the second electrode 4, so that the insulating sample sheet 8 is just introduced into the gap between the first electrode 3 and the second electrode 4.
It can be seen that, in this embodiment, by arranging the two guide assemblies 64, it can be effectively ensured that the insulating sample 8 accurately penetrates from the gap between the first electrode 3 and the second electrode 4, so as to ensure that the position to be broken down of the insulating sample 8 is exactly located 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 the base 641 is connected to the bottom wall of the oil sump 1, specifically, the bottom wall of the base 641 may be connected to the bottom wall of the oil sump 1 through a connection member. The top surface of the base 641 is flush with the gap between the first electrode 3 and the second electrode 4 so that the insulating sample 8 is introduced exactly into the gap between the first electrode 3 and the second electrode 4.
The first end (lower end shown in fig. 3) of the first guide 642 is connected to the base 641, the first end (lower end shown in fig. 3) of the second guide 643 is connected to the base 641 so as to be positionally adjustable, and the second guide 643 is used to adjust a gap with the first guide 642 for passing the insulating sample wafer 8. 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 the passage of the insulating sample wafer 8. 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.
The two stoppers 644 are connected to the second ends (upper ends shown in fig. 3) of the first guide 642 and the second ends (upper ends shown in fig. 3) of the second guide 643, respectively, in one-to-one correspondence. Specifically, each blocking member 644 may have a rectangular parallelepiped shape. Referring to fig. 3, the blocking member 644 at the second end of the first guide 642 has a width greater than that of the first guide 642, and the first guide 642 and the blocking member 644 form an inverted "L" shape to limit the insulating sample wafer 8. Accordingly, the width of the blocking member 644 at the second end of the second guide 643 is greater than the width of the second guide 643, and the second guide 643 and the blocking member 644 also form an inverted "L" shape.
It can be seen that, in this embodiment, the insulation sample 8 is guided by the gap between the first guide member 642 and the second guide member 643, so that the insulation sample 8 is 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 member 643 on the base 641 is adjustable, so as to adjust the gap between the second guide member 643 and the first guide member 642, so that the insulation sample 8 with different widths can be better adapted, the application range is improved, and the two blocking members 644 can block the insulation sample 8, limit the insulation sample 8 in the gap between the second guide member 643 and the first guide member 642, and prevent the insulation sample 8 from being separated from the guide assembly 64.
Referring to fig. 3, in the above embodiment, the first end of the first guide 642 is fixedly connected to the base 641, such as welded connection, and the present embodiment is not limited thereto. There are many ways in which the second guide 643 is adjustably connected to the position of the base 641, and this embodiment is not limited in any way, and only one of them is described in this embodiment, but not limited to this structure: each guide assembly 64 further includes: and 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, 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 slider from sliding out of the guide rail, a limiting member may be disposed at one end of the guide rail away from the first guide 642, and the limiting member limits the slider to prevent the slider from being separated from the guide rail.
In particular, a locking assembly may be provided for locking the second guide 643 after the gap between the second guide 643 and the first guide 642 is determined, avoiding sliding of the second guide 643. In particular, the locking assembly may be a bolt, and the second guide 643 is fixed by tightening the bolt, which may, of course, be determined according to practical situations, and this embodiment is not limited in any way.
It can be seen that, in the present embodiment, the guide rail is disposed on the base 641, so that the second guide 643 is adjustably connected with the base 641, so that the gap between the first guide 642 and the second guide 643 can be better adjusted, thereby being capable of adapting to the insulating sample wafers 8 with different widths, and improving the applicability of the device for the electrical breakdown test.
Referring to fig. 1, in each of the above embodiments, the linkage 7 is connected to the driving wheel 62, and the linkage 7 is used to drive the second electrode 4 to move under the driving of the driving wheel 62, and when the to-be-broken position of the insulating sample 8 is placed between the first electrode 3 and the second electrode 4, the second electrode 4 is moved to clamp the insulating sample 8 with the first electrode 3. Specifically, the driving wheel 62 rotates under the driving of the driving mechanism 61 to drive the linkage 7 to move, the linkage 7 drives the second electrode 4 to move, when the position to be broken down of the insulating sample 8 is about to be placed between the first electrode 3 and the second electrode 4, the second electrode 4 just moves to the first electrode 3, and when the position to be broken down of the insulating sample 8 is placed between the first electrode 3 and the second electrode 4, the insulating sample 8 is clamped between the gap between the second electrode 4 and the first electrode 3.
The linkage 7 may include: a transmission rod 71, a connecting rod 72 and a cam mechanism 73. The connecting rod 72 slidably penetrates through the cover 2 and is partially disposed in the oil groove 1, a first end (a lower end shown in fig. 1) of the connecting rod 72 is connected with the second electrode 4, and a second end (an upper end shown in fig. 1) of the connecting rod 72 is connected with the voltage generator 5 through a high-voltage lead. Specifically, the cover 2 is provided with a through hole through which the connection rod 72 slidably passes, and a portion of the connection rod 72 is disposed inside the oil groove 1 and a portion is disposed outside the oil groove 1.
The first end (lower end shown in fig. 1) of the transmission rod 71 is connected to the driving wheel 62, the second end (upper end shown in fig. 1) of the transmission rod 71 is connected to the connecting rod 72 through the 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 that is disposed outside the oil groove 1.
Those skilled in the art will appreciate that the cam mechanism 73 is of conventional construction for converting rotational motion to linear motion. The cam mechanism 73 includes: the rotation of the cam drives the linear movement of the push rod 731, wherein the push rod 731 is connected to the portion of the connecting rod 72 disposed outside the oil bath 1, and the push rod 731 and the frame.
In operation, the rotation of the driving wheel 62 drives the driving rod 71 to rotate, and then drives the cam in the cam mechanism 73 to rotate, 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 connecting rod 72, the push rod 731 drives the connecting rod 72 to move up and down, and then drives the second electrode 4 to move up and down, i.e. 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 down of the insulating sample wafer 8, the driving wheel 62 rotates to drive the insulating sample wafer 8 to move leftwards (relative to fig. 1), and meanwhile, the driving wheel 62 rotates to drive 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 an up-and-down moving state. Although the second electrode 4 moves downward when the connecting rod 72 moves downward, the gap between the first electrode 3 and the second electrode 4 becomes smaller so as to clamp the insulating sample sheet 8, but the driving wheel 62 rotates continuously, the cam rotates continuously, the connecting rod 72 moves upward continuously, the gap between the first electrode 3 and the second electrode 4 becomes larger so as to release the insulating sample sheet 8, the above-mentioned moving process is repeated until the next position to be broken of the insulating sample sheet 8 is placed between the first electrode 3 and the second electrode 4, the driving wheel 62 stops rotating, the insulating sample sheet 8 stops moving leftward, the corresponding cam mechanism 73 also stops moving, the connecting rod 72 also stops moving, and the gap between the first electrode 3 and the second electrode 4 at this time just becomes smaller so as to clamp the insulating sample sheet 8 just.
It can be seen that, in this embodiment, the linkage 7 moves under the driving of the driving wheel 62, so that the motion can be effectively unified, and 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: and an elastic member 9. The elastic member 9 is sleeved on the connecting rod 72 disposed in the oil groove 1 and disposed between the second electrode 4 and the cover 2. Specifically, the elastic member 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 member 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 in a compressed state, but 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 smaller under the action of the elastic force of the elastic member 9, and the insulating sample sheet 8 disposed between the second electrode 4 and the first electrode 3 is better clamped, so that the insulating sample sheet 8 is more tightly contacted with the second electrode 4 and the first electrode 3, and the voltage generator 5 can apply a voltage to the insulating sample sheet 8 through the second electrode 4 to break down.
In summary, this embodiment can make insulating sample 8 carry out electric breakdown test in succession, and, can make insulating sample 8 automatic conveying so that insulating sample 8 wait to break down the position and place in proper order between first electrode 3 and second electrode 4 through conveyer 6, can make insulating sample 8 press from both sides and locate between first electrode 3 and second electrode 4 through aggregate unit 7, realize carrying out electric breakdown test in proper order to insulating sample 8's each position of waiting to break down automatically and continuously, and then can comprehensively and continuously carry out comprehensive analysis to the electric insulation performance of cable insulation layer, and, need not artifical the participation, the inconsistency of each operation has greatly reduced and the deviation such as contact degree etc. between electrode and the insulating sample when having reduced each test, effectively improved the accuracy of electric breakdown test result, and then ensured the accuracy of electric insulation performance analysis of cable insulation layer.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. An apparatus for conducting an electrical breakdown test on an insulation sample of a cable, comprising: the device comprises an oil groove (1), a cover body (2) which is connected with the oil groove (1) in an openable and closable manner, a first electrode (3) and a second electrode (4) which are arranged in the oil groove (1), a conveying device (6) and a linkage device (7); wherein,
the first electrode (3) is arranged opposite to the second electrode (4) and has a preset distance, the first electrode (3) is connected with the bottom wall of the oil groove (1), and the second electrode (4) is used for being connected with a voltage generator (5) arranged outside the oil groove (1);
the conveying device (6) is used for enabling an insulating sample sheet (8) in a film state to be slidably penetrated between the first electrode (3) and the second electrode (4), and stopping conveying the insulating sample sheet (8) when the position to be broken down of the insulating sample sheet (8) is arranged between the first electrode (3) and the second electrode (4);
the linkage device (7) is connected with the second electrode (4) and is used for driving the second electrode (4) to move, and when the position to be broken down 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);
the transfer device (6) comprises: 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 sheet (8) is wound on the driven wheel (63), the insulation sample sheet (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 of the insulation sample sheet (8) is wound on the driving wheel (62);
the driving mechanism (61) is connected with the driving wheel (62) and is used for driving the driving wheel (62) to rotate so as to drive the insulating sample wafer (8) to slidably penetrate through a gap between the first electrode (3) and the second electrode (4), and when the position to be broken down of the insulating sample wafer (8) is arranged between the first electrode (3) and the second electrode (4), the driving of the driving wheel (62) is stopped;
the 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 way and is partially arranged in the oil groove (1), a first end of the connecting rod (72) is connected with the second electrode (4), and a 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).
2. The device for electrical breakdown testing of insulating samples of cables according to claim 1, characterized in that the conveying means (6) further comprise: a guide mechanism; wherein,
the guiding mechanism is arranged in the oil groove (1) and is used for guiding the insulating sample wafer (8), so that the insulating sample wafer (8) is arranged in a gap between the first electrode (3) and the second electrode (4).
3. The apparatus for conducting an electrical breakdown test on an insulation sample of a cable according to claim 2, wherein the guiding mechanism comprises: two guide assemblies (64); wherein,
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 a gap between the first electrode (3) and the second electrode (4).
4. A device for electrical breakdown testing of insulating samples of electrical cables according to claim 3, characterized in that each guiding 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) is in the same plane with a gap between the first electrode (3) and the second electrode (4);
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, and the second guide (643) is used for adjusting a gap between the first guide (642) and the first guide (642), and the gap is used for enabling the insulating sample sheet (8) to pass through;
the two blocking members (644) are respectively connected with the second ends of the first guide members (642) and the second ends of the second guide members (643) in a one-to-one correspondence.
5. The apparatus for conducting an electrical breakdown test on an insulation sample of a cable according to claim 4, 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.
6. The device for performing an electrical breakdown test on an insulation sample of a cable according to claim 1, wherein the linkage device (7) is connected with the driving wheel (62), the linkage device (7) is used for driving the second electrode (4) to move under the driving of the driving wheel (62), and when the position to be broken down of the insulation sample (8) is placed between the first electrode (3) and the second electrode (4), the second electrode (4) is caused to move to clamp the insulation sample (8) with the first electrode (3).
7. The apparatus for conducting an electrical breakdown test on an insulation coupon of a cable according to claim 6, further comprising: an elastic member (9); wherein,
the elastic piece (9) is sleeved on the part, which is arranged in the oil groove (1), of the connecting rod (72) and is arranged between the second electrode (4) and the cover body (2).
8. The device for electrical breakdown testing of insulating samples of electrical cables according to claim 1, 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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| CN108872804B (en) * | 2018-04-28 | 2020-09-29 | 海南电网有限责任公司电力科学研究院 | Device for detecting solid insulation discharge |
| 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 |
| CN111007367B (en) * | 2019-12-18 | 2022-03-22 | 安徽复兴电缆集团有限公司 | Withstand voltage detection device of cable |
| CN111398747B (en) * | 2020-03-10 | 2022-08-09 | 广州启光智造技术服务股份有限公司 | Method for detecting use safety of marine cable |
| 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 |
| 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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