CN109030952B - Mandrel volume resistivity measuring equipment for insulator - Google Patents
Mandrel volume resistivity measuring equipment for insulator Download PDFInfo
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- CN109030952B CN109030952B CN201810904665.3A CN201810904665A CN109030952B CN 109030952 B CN109030952 B CN 109030952B CN 201810904665 A CN201810904665 A CN 201810904665A CN 109030952 B CN109030952 B CN 109030952B
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- 239000012212 insulator Substances 0.000 title claims abstract description 57
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000008859 change Effects 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000032683 aging Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229920002379 silicone rubber Polymers 0.000 description 3
- 239000004945 silicone rubber Substances 0.000 description 3
- 238000003916 acid precipitation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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Abstract
The present invention provides a mandrel volume resistivity measuring apparatus for an insulator, the apparatus comprising: the temperature and humidity adjusting box is used for providing a sealed test environment with constant temperature and humidity for the core rod to be tested; the sliding guide rail is arranged on the inner wall of the temperature and humidity adjusting box; and the volume resistivity tester is slidably arranged on the sliding guide rail and is used for clamping the core rod to be tested and measuring the volume resistivity of the core rod to be tested. The volume resistivity of the core rod to be measured is measured in the sealed test environment in the temperature and humidity adjusting box, so that the sealed test environment with constant temperature and humidity can be ensured, the influence of environmental change on the measurement precision is avoided, meanwhile, potential safety hazards caused by electric leakage in a circuit where the core rod to be measured is located can be avoided by measuring in the temperature and humidity adjusting box, external personnel can be prevented from contacting the circuit where the core rod to be measured is located, and the measurement safety is further improved.
Description
Technical Field
The invention relates to the technical field of power transmission and transformation, in particular to a mandrel volume resistivity measuring device for an insulator.
Background
The electric power system is an important support for national economy and is also the most complex artificial network in the world. Maintaining the stability of the power grid is an important task for developing the civil and economic aspects and is also limited by a plurality of factors. The insulator is used as a main carrier of a connecting circuit in a power grid, is an important supporting point for supporting the power grid, and has self-evident importance. Experience at home and abroad shows that many line accidents are the root cause of line flashover caused by the problems of insulation quality and operation age, and as the operation time goes on, particularly the composite insulator is easy to solidify, the core rod of the composite insulator can corrode, age and have poor mechanical and electrical properties, so that the core rod of the composite insulator must be strictly detected in order to effectively control the normal work of the composite insulator on a line and maintain the stable operation of a power grid.
To date, a great deal of research work has been carried out on insulator flashover at home and abroad, and a great deal of novel insulating materials have been widely applied to power transmission lines, particularly composite insulator insulating materials. The cured properties of the insulation material decrease with the passage of operating life, while the mechanical and electrical properties of the insulator are important. The mechanical property is closely related to the core rod of the insulator, the mechanical property of the composite insulator is poor, and the core rod of the insulator is corroded and broken, so that the composite insulator is a great reason for causing line flashover.
However, the reform is open, the economy of China is rapidly developed, but due to the fact that no attention is paid to environmental protection, industrial and agricultural pollution is serious, the environment is rapidly worsened, the pH value of rainwater is not neutral, the rainwater is slowly acidified to form acid rain, the acid rain can corrode the composite insulators, and therefore corrosion of the composite insulator core rods is aggravated, and flashover accidents occur. In order to prevent the occurrence of the similar accidents, the volume resistivity test of the composite insulator core rod is required.
The Chinese publication number is: CN 104062527A discloses an evaluation method for the aging degree of a running composite insulator, which comprises the steps of firstly measuring the volume resistivity of a disc-shaped high-temperature vulcanized silicone rubber sample cut from the surface of the composite insulator running through a net by using a volume resistivity tester at different temperatures, then drawing a curve and calculating the linear fitting of the curve, and finally comprehensively judging the aging degree of the composite insulator according to the linear fitting of the curve and the change condition of the volume resistivity of the high-temperature vulcanized silicone rubber.
According to the method for evaluating the aging degree of the running composite insulator, the volume resistivity of the wafer type high-temperature vulcanized silicone rubber sample cut from the surface of the composite insulator running through the screen is measured by the volume resistivity tester at different temperatures, the measurement precision is low, the efficiency is low, and the cylindrical high-voltage electrode can bring safety risks.
Disclosure of Invention
In view of this, the invention provides a mandrel volume resistivity measuring device for an insulator, and aims to solve the problems of low volume resistivity measuring precision and potential safety hazard in the prior art.
The invention provides a mandrel volume resistivity measuring device for an insulator, the device comprising: the temperature and humidity adjusting box is used for providing a sealed test environment with constant temperature and humidity for the core rod to be tested; the sliding guide rail is arranged on the inner wall of the temperature and humidity adjusting box; and the volume resistivity tester is slidably arranged on the sliding guide rail and is used for clamping the core rod to be tested and measuring the volume resistivity of the core rod to be tested.
Further, the above apparatus for measuring volume resistivity of a core rod for an insulator, the volume resistivity tester comprises: the high-temperature-resistant plate is erected on the sliding guide rail and is connected with the sliding guide rail in a sliding manner; the plurality of ground wire connecting rows are arranged on the high-temperature resistant plate and used for introducing current into the ground; the high-voltage connecting plate is arranged above the high-temperature resistant plate and is spaced from the high-temperature resistant plate, and is used for supplying power for testing the core rod to be tested; the measuring electrodes and the high-voltage electrodes are arranged between the high-temperature-resistant plate and the high-voltage connecting plate in a one-to-one correspondence mode, the measuring electrodes are connected with the ground wire connecting bar, the high-voltage electrodes are connected with the high-voltage connecting plate, and the core rod to be measured is clamped between the corresponding high-voltage electrodes and the measuring electrodes; and the shielding ring is arranged on the core rod to be tested, is connected with the ground wire connecting bar and is used for shielding the surface current of the core rod to be tested.
Further, the above apparatus for measuring volume resistivity of a mandrel for an insulator, the volume resistivity tester further comprises: and the position adjusting piece is arranged on the high-voltage connecting plate and used for adjusting the relative distance between the high-voltage electrode and the high-voltage connecting plate and locking the high-voltage electrode and the high-voltage connecting plate so as to adjust the clamping force of the high-voltage electrode and the measuring electrode on the core rod to be measured.
Further, the position adjusting piece comprises a spring sleeve arranged on the high-voltage connecting plate, the high-voltage electrode penetrates through the high-voltage connecting plate, and the first end of the high-voltage electrode is arranged in the spring sleeve; and the regulator is arranged on the sleeve, is connected with the sleeve in a sliding manner along the direction vertical to the length direction of the spring sleeve and is used for locking the first end of the high-voltage electrode to a preset position in the spring sleeve so as to lock the high-voltage electrode and the high-voltage connecting plate.
Further, according to the mandrel volume resistivity measuring device for the insulator, the spring is arranged in the spring sleeve, sleeved outside the high-voltage electrode and used for applying elastic pressure to the high-voltage connecting plate.
Further, according to the mandrel volume resistivity measuring equipment for the insulator, the temperature and humidity adjusting box is provided with a high-voltage connecting piece which penetrates through the temperature and humidity adjusting box; one end of the high-voltage connecting piece is connected with the high-voltage connecting plate, and the other end of the high-voltage connecting piece is used for being connected with a power supply.
Further, according to the core rod volume resistivity measuring device for the insulator, the volume resistivity tester is adsorbed to the sliding guide rail through magnetic force.
Further, according to the core rod volume resistivity measuring device for the insulator, the fixing piece is arranged on the sliding guide rail and used for supporting the volume resistivity tester.
Further, above-mentioned a mandrel volume resistivity measuring equipment for insulator, the side of temperature and humidity control box is equipped with the chamber door, its with the box of temperature and humidity control box rotationally is connected for selectively sealed closure the box of temperature and humidity control box is in order to form sealed test environment.
Further, according to the mandrel volume resistivity measuring equipment for the insulator, the bottom of the box body of the temperature and humidity adjusting box is provided with the leveling feet for adjusting the levelness of the temperature and humidity adjusting box.
Further, above-mentioned a mandrel volume resistivity measuring equipment for insulator, be equipped with temperature and humidity controller on the humiture control box, be used for adjusting the temperature, the humidity of the sealed test environment in the humiture control box.
Further, above-mentioned a mandrel volume resistivity measuring equipment for insulator, be equipped with display interface and switch on the temperature and humidity controller, display interface is used for right the temperature, the humidity of the sealed test environment in the temperature and humidity control box set up and show.
Further, the above apparatus for measuring volume resistivity of a mandrel for an insulator further comprises: the data collector is used for obtaining the current which flows through the core rod to be tested and is measured by the volume resistivity tester and the voltage at two ends of the core rod to be tested; the processor is electrically connected with the data collector and used for receiving the current flowing through the core rod to be detected and the voltage at the two ends of the core rod to be detected, which are acquired by the data collector, and calculating to confirm the volume resistivity of the core rod to be detected; and the memory is electrically connected with the processor and is used for storing the current which is acquired by the data acquisition unit and flows through the core rod to be detected, the voltage at two ends of the core rod to be detected and the volume resistivity of the core rod to be detected confirmed by the processor.
Further, the above apparatus for measuring volume resistivity of a mandrel for an insulator further comprises: and the display is connected with the memory or the processor and is used for displaying one or more of the current flowing through the core rod to be tested, the voltage at two ends of the core rod to be tested and the volume resistivity of the core rod to be tested.
According to the core rod volume resistivity measuring equipment for the insulator, the sealed test environment with constant temperature and humidity is provided for the core rod to be measured through the temperature and humidity adjusting box, so that the problem that the accuracy and precision of the test result are low due to the change of the test environment in the measuring process of the core rod to be measured is avoided; the volume resistivity tester slides along the sliding guide rail, so that the volume resistivity tester can move conveniently, the stability of the volume resistivity tester is improved, and the influence of the inclination of the volume resistivity tester on the accuracy and precision of the measurement of the core rod to be tested is avoided; the core rod to be measured is clamped by the volume resistivity tester and is measured, so that the core rod to be measured slides into the temperature and humidity adjusting box along the sliding guide rail along with the volume resistivity tester, and the volume resistivity is measured. Compared with the prior art, volume resistivity of the core rod to be measured is measured in the sealed test environment in the temperature and humidity adjusting box, so that the sealed test environment with constant temperature and humidity can be ensured, the influence of environmental change on measurement precision is avoided, meanwhile, potential safety hazards caused by electric leakage in a circuit where the core rod to be measured is located can be avoided by measuring in the temperature and humidity adjusting box, external personnel can be prevented from contacting the circuit where the core rod to be measured is located, and the measurement safety is further improved.
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 view of a mandrel volume resistivity measuring apparatus for an insulator according to an embodiment of the present invention;
fig. 2 is a block diagram showing a configuration of a mandrel volume resistivity measuring apparatus for an insulator according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a volume resistivity tester 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, a schematic structural diagram of a mandrel volume resistivity measurement apparatus for an insulator according to an embodiment of the present invention is shown. As shown, the measuring apparatus includes: the temperature and humidity control system comprises a temperature and humidity adjusting box 1, a sliding guide rail 2, a volume resistivity tester 3, a data acquisition unit 4, a processor 5, a memory 6 and a display 7; wherein, temperature humidity control box 1 is used for providing the invariable sealed test environment of temperature, humidity for the plug 8 that awaits measuring to avoid 8 measuring in-process test environment changes to cause its test result accuracy and precision low. The sliding guide rail 2 is arranged on the inner wall of the temperature and humidity adjusting box 1, and preferably, the sliding guide rail 2 may be a guide rail welded or fixed on the inner wall of the temperature and humidity adjusting box 1, or a guide groove formed on the inner wall of the temperature and humidity adjusting box 1. The volume resistivity tester 3 is slidably arranged on the sliding guide rail 2, the volume resistivity tester 3 is used for clamping a core rod to be tested and measuring the volume resistivity of the core rod, and the volume resistivity tester 3 is detachably connected with the sliding guide rail 2 so that the volume resistivity tester 3 can be taken out of the sliding guide rail when sliding to the end part of the sliding guide rail 2 to install, replace or disassemble the core rod 8 to be tested, and certainly, the volume resistivity tester 3 can also be installed, replaced or disassembled on the sliding guide rail 2; preferably, the volume resistivity tester 3 is adsorbed to the sliding guide rail 2 by magnetic force, so that the disassembly and the assembly are convenient, and the stability of the volume resistivity tester 3 during testing is ensured; in order to further improve the stability of the volume resistivity tester 3 erected on the sliding guide rail 2, the sliding guide rail 2 is provided with a fixing part 9 for supporting the volume resistivity tester 3 so as to avoid the volume resistivity tester 3 from inclining and falling, and further improve the stability of the volume resistivity tester 3 during testing; preferably, the fixing member 9 is a right-angle fixing plate, a first side wall 91 of which is welded to the sliding guide rail 2, and a second side wall 92 disposed at a right angle to the first side wall 91 and horizontally disposed, for supporting the high temperature resistant plate 31 of the volume resistivity tester 3, so as to improve the stability of the volume resistivity tester 3.
Referring to fig. 2, a block diagram of a mandrel volume resistivity measuring apparatus for an insulator according to an embodiment of the present invention is shown. The data collector 4 is used for obtaining the current flowing through the core rod 8 to be measured and the voltage at two ends of the core rod 8 to be measured, which are measured by the volume resistivity tester 3, and can be obtained through an ammeter and a voltmeter or through a collecting chip. The processor 5 is electrically connected with the data collector 4, and is used for receiving the current flowing through the core rod 8 to be tested and the voltage at the two ends of the core rod 8 to be tested, which are acquired by the data collector 4, and calculating according to the voltage and the current to confirm the volume resistivity of the core rod 8 to be tested; preferably, the processor 5 may be calculated by the following formula:
in the formula, U is a voltage at both ends of the core rod to be measured, i.e., a voltage of the high-voltage connection plate 33 in the volume resistivity tester 3, I is a current flowing through the core rod to be measured, d is a thickness of the core rod to be measured, and S is an end surface area of the core rod to be measured. The data collector 4 is arranged in the temperature and humidity adjusting box 1 so as to collect data of the core rod 8 to be tested clamped by the volume resistivity tester 3. The processor 5 includes: a central processing unit CPU, a digital signal processor, an application specific integrated circuit ASIC or a field programmable gate array FPGA.
The memory 6 is electrically connected with the processor 5 and is used for receiving the current which is acquired by the data acquisition unit 4 and flows through the core rod 8 to be tested and the voltage at two ends of the core rod 8 to be tested and received by the processor 5, and the volume resistivity of the core rod 8 to be tested and confirmed by the processor 5, and storing the current which is acquired by the data acquisition unit 4 and flows through the core rod 8 to be tested and the voltage at two ends of the core rod 8 to be tested and the volume resistivity of the core rod 8 to be tested and confirmed by the processor 5; of course, the memory 6 may also be electrically connected to the data collector 4, and connected to the data collector 4 to transmit the current flowing through the core rod 8 to be measured and the voltage across the core rod 8 to be measured, which are acquired by the data collector 4, and at the same time connected to the processor 5 to transmit the volume resistivity of the core rod 8 to be measured, which is determined by the processor 5. The memory 6 can be arranged in the temperature and humidity adjusting box 1 or outside the temperature and humidity adjusting box 1; preferably, the storage 6 is provided in the temperature and humidity adjusting box 1 in order to simplify the arrangement of the equipment harness. The memory 6 comprises one or more of a read only memory ROM, a random access memory RAM, a flash memory or an electrically erasable programmable read only memory EEPROM.
The display 7 is connected with the memory 6 or the processor 5 and is used for displaying one or more of the current flowing through the core rod 8 to be tested, the voltage at two ends of the core rod 8 to be tested and the volume resistivity of the core rod 8 to be tested; of course, the display 7 may be disposed on the outer surface of the case body 11 of the temperature and humidity adjusting case 1 for easy viewing.
With continued reference to fig. 1, the temperature and humidity adjusting box 1 includes: the temperature and humidity controller comprises a box body 11, a box door 12, a leveling foot margin 13 and a temperature and humidity controller 14; the temperature and humidity adjusting box body 11 is provided with a box door 12 on the side, the box door 12 is rotatably connected with the box body 11, namely the box door 12 is in pivot connection with the box body 11 and is used for selectively sealing and closing the box body 11 of the temperature and humidity adjusting box 1 to form a sealed test environment, namely the box body 11 of the temperature and humidity adjusting box 1 is sealed and closed during testing, and the box door 12 is opened during installation and replacement or detachment of a core rod 8 to be tested; the box door 12 can be provided with an observation window 121 so as to observe the measurement process in the box body 11; the observation window 121 is made of high-strength tempered glass. The side of the box body 11 opposite to the box door 12 is provided with a high-voltage connector (not shown in the figure) which penetrates through the box body 11 of the temperature and humidity adjusting box 1, one end of the high-voltage connector can be arranged in the box body 11 so as to be connected with a high-voltage connecting plate 33 of the volume resistivity tester 3, and the other end of the high-voltage connector can be arranged outside the box body 11 and used for being connected with a power supply so as to supply power for the high-voltage connecting plate 33 of the volume resistivity tester 3. The bottom of the box body 11 is provided with a leveling foot margin 13 for adjusting the levelness of the temperature and humidity adjusting box 1 so as to avoid the inclination of the volume resistivity tester 3 and further ensure the measurement stability and accuracy of the volume resistivity tester 3; the number of the leveling feet 13 may be four, and the leveling feet 13 are respectively arranged at four corners of the bottom plate of the box body 11, and preferably, the leveling feet 13 are length adjusting rods. The temperature and humidity adjusting box 1 is provided with a temperature and humidity controller 14 for adjusting the temperature and humidity of the sealed test environment in the temperature and humidity adjusting box 1 so as to control the temperature and humidity in the temperature and humidity adjusting box 1 to be constant within a preset temperature and a preset humidity, and further avoid the low measurement precision of the volume resistivity of the core rod 8 to be measured caused by the change of the environmental temperature and humidity; the temperature and humidity controller 14 is provided with a display interface 141 and a switch 142, wherein the display interface 141 is used for setting and displaying the temperature and the humidity of the sealed test environment in the temperature and humidity adjusting box 14 so as to adjust the preset temperature and the preset humidity; the switch 142 is connected to the temperature and humidity controller 14 and the display interface 141 to control the start and stop of the temperature and humidity controller 14 and the display interface 141; preferably, the display interface 141 and the switch 142 are disposed on the outer surface of the cabinet 11 or the door 12.
Referring to fig. 3, it is a schematic structural diagram of a volume resistivity tester provided in an embodiment of the present invention. As shown in the figure, the volume resistivity tester 3 includes: the device comprises a high temperature resistant plate 31, a ground wire connecting bar 32, a high voltage connecting plate 33, a measuring electrode 34, a high voltage electrode 35, a shielding ring 36 and a position adjusting piece 37; wherein, the high temperature resistant plate 31 is erected on the sliding guide rail 2 and is connected with the sliding guide rail 2 in a sliding way; preferably, the high temperature resistant plate 31 is erected on the sliding guide rail 2 and the fixing piece 9; in order to ensure the stability of the connection between the high temperature resistant plate 31 and the sliding guide rail 2, it is preferable that the high temperature resistant plate 31 and the sliding guide rail 2 are attracted by magnetic force. One or more ground wire connecting bars 32 are disposed on the high temperature resistant plate 31, and are used for introducing the current flowing to the ground wire connecting bars 32 to the ground, that is, the voltage value on the ground wire connecting bars 32 and the voltage value connected with the ground wire connecting bars are zero; in order to avoid the wire confusion of the volume resistivity tester 3, it is preferable that a plurality of ground connection bars 32 are arranged above the high temperature resistant plate 31 in parallel at intervals, that is, the ground connection bars 32 are arranged along the length direction of the high temperature resistant plate 31. The high-voltage connecting plate 33 is arranged above the high-temperature resistant plate 31 at an interval and used for supplying power for testing of the core rod 8 to be tested; preferably, the high-voltage connecting plate 33 can be electrically connected with a high-voltage connecting piece arranged on the box body 11 through a high-voltage sleeve 38, so that a power supply outside the box body 11 can be used for supplying power to the high-voltage connecting plate 33, and further, a test power supply of the core rod 8 to be tested is improved.
With continued reference to fig. 3, the measuring electrode 34 and the high voltage electrode 35 are disposed between the high temperature resistant plate 31 and the high voltage connecting plate 33, a first end (lower end as shown in fig. 3) of the measuring electrode 34 is disposed on the high temperature resistant plate 31, a first end (upper end as shown in fig. 3) of the high voltage electrode 35 is disposed through the high voltage connecting plate 33, and the high voltage electrode 35 is connected to the high voltage connecting plate 33 so as to supply power to the high voltage electrode 35; the core rod 8 to be measured is clamped between the second end (the upper end shown in fig. 3) of the corresponding measuring electrode 34 and the second end (the lower end shown in fig. 3) of the high-voltage electrode 35; preferably, the plurality of measuring electrodes 34 are linearly arranged on the high temperature resistant plate 31, and the ground wire connecting row 32 is respectively arranged between the two rows of measuring electrodes 34; the measuring electrodes 34 and the high-voltage electrodes 35 are arranged in a one-to-one correspondence manner, and the core rod 8 to be measured can be clamped between the measuring electrodes 34 and the high-voltage electrodes 35, namely, the high-voltage electrodes 35 are used for supplying power to the core rod 8 to be measured, and the measuring electrodes 34 are grounded so as to realize the integrity of the circuit; preferably, the measuring electrode 34 and the high voltage electrode 35 are coaxially arranged so as to ensure the stability of the core rod 8 to be measured, and further ensure the connection stability of the circuit where the core rod 8 to be measured is located; further preferably, the core rod 8 to be measured, the measuring electrode 34 and the high voltage electrode 35 are all coaxially arranged. As shown in fig. 3, 24 measuring electrodes 34 are disposed on the high temperature resistant plate 31, and are linearly arranged in four rows, and one ground connection row 32 is disposed between every two rows of measuring electrodes 34, so as to optimize the arrangement of connection lines between the measuring electrodes 34 and the ground connection row 32; meanwhile, 24 high-voltage electrodes 35 corresponding to the measuring electrodes 34 one by one are arranged on the high-voltage connecting plate 33, one core rod 8 to be tested can be clamped between the corresponding measuring electrode 34 and the high-voltage electrode 35, that is, the volume resistivity tester 3 can simultaneously test 24 core rods 8 to be tested, that is, 24 mounting holes are formed in the high-voltage connecting plate 33, the high-voltage electrodes 35 penetrate through the corresponding mounting holes, so that the upper ends of the high-voltage electrodes 35 are arranged above the high-voltage connecting plate 33, the lower ends of the high-voltage electrodes 35 are arranged below the high-voltage connecting plate 33 and abut against the top wall of the core rod 8 to be tested, that is, 24 core rods 8 to be tested form 24 parallel circuits through the 24 measuring electrodes 34 and the high-voltage electrodes 35 and are connected between the high-voltage connecting plate 33 and the ground wire connecting bar 32 in parallel.
With reference to fig. 3, the shielding ring 36 is disposed on the core rod 8 to be measured, and the shielding ring 36 is connected to the ground line connecting bar 32, and is configured to shield the surface current of the core rod 8 to be measured, so as to prevent the surface current of the core rod 8 to be measured from affecting the measurement of the volume resistivity of the core rod 8 to be measured, thereby improving the measurement accuracy and efficiency. The measuring electrode 34, the high voltage electrode 35 and the shielding ring 36 form a standard three-electrode system so as to complete the measurement of the volume resistivity of the core rod 8 to be measured. The shielding ring 36 is sleeved on the outer wall of the core rod 8 to be tested and connected with the ground wire connecting bar 32 through a wire with a clamp.
With continued reference to fig. 3, a position adjusting member 37 is disposed on the high-voltage connecting plate 33 for adjusting the relative distance between the high-voltage electrode 35 and the high-voltage connecting plate 33 and locking the high-voltage electrode 35 and the high-voltage connecting plate 33, so as to adjust the clamping force of the high-voltage electrode 35 and the measuring electrode 34 on the core rod 8 to be measured.
With continued reference to fig. 3, the position adjuster 37 includes: a spring sleeve 371, an adjuster 372 and a spring (not shown in the figures); the spring sleeve 371 is disposed above the high-voltage connection board 33 and can be fixed to the top wall of the high-voltage connection board 33 by welding, the high-voltage electrode 35 is disposed through the high-voltage connection board 33, and a first end (an upper end as shown in fig. 3) of the high-voltage electrode 35 is disposed in the spring sleeve 371 and can move up and down relative to the high-voltage connection board 33 along the spring sleeve 371; the adjuster 372 is disposed on the spring sleeve 371, and is disposed through the spring sleeve 371 and partially disposed in the spring sleeve 371, the adjuster 372 is slidably connected to the spring sleeve 371 along a direction perpendicular to the length direction of the spring sleeve 371, that is, the adjuster 372 can extend and retract along the direction perpendicular to the length direction of the spring sleeve 371, so as to selectively press the first end of the high-voltage electrode 35 to lock the high-voltage electrode 35 and the high-voltage connection plate 33, so as to prevent the high-voltage electrode 35 from moving up and down (relative to the position shown in fig. 3), and further to relatively fix the high-voltage electrode 35 and the high-voltage connection plate 33, so that the high-voltage connection plate 33 presses against the mandrel 8 to be tested through the high-voltage electrode 35, and further to ensure that the high-voltage electrode 35 and the measurement electrode 34 clamp the mandrel 8 to be tested. The spring is disposed in the spring sleeve 371 and sleeved outside the high-voltage electrode 35, that is, the spring is disposed between the high-voltage electrode 35 and the spring sleeve 371, so as to press the spring when pressing against the first end of the high-voltage electrode 35 through the regulator 372, and the lower end of the spring is disposed on the high-voltage connection board 33, so that the spring is in a compressed state, and further applies an elastic pressure to the high-voltage connection board 33, so as to clamp the core rod 8 to be tested between the high-voltage electrode 35 and the measurement electrode 34. The spring sleeve 371 may be made of a conductive material, and has the same voltage value as the voltage value of the high voltage electrode 35 and the high voltage connection board 33, that is, the voltage value of the power supply connected to the high voltage connection member.
Referring to fig. 1 to 3, the working process of the measuring apparatus provided in the present embodiment will now be described in detail:
firstly, the volume resistivity tester 3 is placed outside the box body 11 of the temperature and humidity adjusting box 1 in an initial state, a plurality of core rods 8 to be tested are clamped between the high-voltage electrode 35 and the measuring electrode 34, the upper ends of the spring and the high-voltage electrode 35 are adjusted to a set position, namely the position of the adjuster 372 through the adjuster 372, the adjuster 372 is locked in the spring sleeve 371 in a sliding mode, so that the high-voltage electrode 35 and the high-voltage connecting plate 33 are locked, the core rods 8 to be tested are pressed onto the measuring electrode 34 through the spring and the high-voltage electrode 35, namely the core rods 8 to be tested are clamped by the high-voltage electrode 35 and the measuring electrode 34, the volume resistivity tester 3 slides into the box body 11 along the sliding guide rail 2, and the box door 12 is closed to provide a sealed testing environment for the core rods 8 to be tested.
Then, the switch 142 is turned on, the set temperature and humidity of the sealed test environment in the box body 11 are set through the display interface 141, so that the temperature and humidity of the sealed test environment can be adjusted and kept constant to the set temperature and humidity by connecting the temperature and humidity controller 14, and the power is supplied to the high-voltage connecting piece through the power supply, so that the power is supplied to the circuit where the core rod 8 to be measured is located, that is, the volume resistivity measurement of the core rod 8 to be measured is started through the volume resistivity tester 3. Wherein, the set temperature and humidity can be determined according to the actual situation.
Finally, the data collector 4 is used for obtaining the current flowing through the core rod 8 to be measured and the voltage at the two ends of the core rod 8 to be measured in the measuring process of the core rod 8 to be measured, the current flowing through the core rod 8 to be tested can be obtained through an ammeter, the voltage on the high-voltage end of the core rod 8 to be tested, namely the high-voltage connecting plate 33, the high-voltage electrode 35 or the spring sleeve 371, can be obtained through a chip and the like, meanwhile, the volume resistivity of the core rod 8 to be measured is calculated by the processor 5, the current passing through the core rod 8 to be measured, the voltage at two ends of the core rod 8 to be measured and the volume resistivity of the core rod 8 to be measured are stored by the memory 6, one or more of the current passing through the core rod 8 to be measured, the voltage at two ends of the core rod 8 to be measured and the volume resistivity of the core rod 8 to be measured can be displayed by the display 7, so as to know the volume resistivity of the core rod 8 to be detected and further know that the sliding guide rail 2 to be detected slides out of the temperature and humidity adjusting box 1.
In summary, the core rod volume resistivity measuring apparatus for an insulator provided in this embodiment provides a sealed test environment with constant temperature and humidity for the core rod 8 to be tested through the temperature and humidity adjusting box 1, so as to avoid the test result accuracy and precision caused by the test environment change in the measurement process of the core rod 8 to be tested; the volume resistivity tester 3 slides along the sliding guide rail 2, so that the volume resistivity tester 3 can conveniently move, the stability of the volume resistivity tester 3 is improved, and the influence of the inclination and the like of the volume resistivity tester 3 on the measurement accuracy and precision of the core rod 8 to be measured is avoided; the core rod 8 to be measured is clamped by the volume resistivity tester 3 and is measured in volume resistivity, so that the core rod 8 to be measured slides along the sliding guide rail 2 into the temperature and humidity adjusting box 1 along with the volume resistivity tester 3, and the volume resistivity is measured. Compared with the prior art, volume resistivity of the core rod 8 to be measured is measured in the sealed test environment in the temperature and humidity adjusting box 1, so that the sealed test environment with constant temperature and humidity can be ensured, the influence of environmental change on measurement precision can be avoided, meanwhile, potential safety hazards caused by electric leakage in a circuit where the core rod 8 to be measured is located can be avoided by measuring in the temperature and humidity adjusting box 1, the circuit where the core rod 8 to be measured is located can be avoided by avoiding contact of external personnel, and the measurement safety can be further improved.
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 (13)
1. A mandrel volume resistivity measurement apparatus for an insulator, comprising:
the temperature and humidity adjusting box (1) is used for providing a sealed test environment with constant temperature and humidity for the core rod (8) to be tested;
the sliding guide rail (2) is arranged on the inner wall of the temperature and humidity adjusting box (1);
the volume resistivity tester (3) is slidably arranged on the sliding guide rail (2) and is used for clamping the core rod (8) to be tested and measuring the volume resistivity of the core rod;
the volume resistivity tester (3) includes:
a high temperature resistant plate (31) which is erected on the sliding guide rail (2) and is connected with the sliding guide rail (2) in a sliding manner;
the ground wire connecting rows (32) are arranged on the high-temperature-resistant plate (31) and are used for introducing current to the ground;
the high-voltage connecting plate (33) is arranged above the high-temperature resistant plate (31) and is spaced from the high-temperature resistant plate, and is used for supplying power for testing of the core rod (8) to be tested;
the device comprises a plurality of one-to-one corresponding measuring electrodes (34) and high-voltage electrodes (35) which are arranged between the high-temperature-resistant plate (31) and the high-voltage connecting plate (33), wherein the measuring electrodes (34) are connected with the ground wire connecting bar (32), the high-voltage electrodes (35) are connected with the high-voltage connecting plate (33), and the core rod (8) to be measured is clamped between the corresponding high-voltage electrodes (35) and the measuring electrodes (34);
and the shielding ring (36) is arranged on the core rod (8) to be tested, is connected with the ground wire connecting bar (32) and is used for shielding the surface current of the core rod (8) to be tested.
2. The apparatus for measuring the volume resistivity of the core rod for an insulator according to claim 1, wherein the volume resistivity tester (3) further comprises:
and the position adjusting piece (37) is arranged on the high-voltage connecting plate (33) and is used for adjusting the relative distance between the high-voltage electrode (35) and the high-voltage connecting plate (33) and locking the high-voltage electrode (35) and the high-voltage connecting plate (33) so as to adjust the clamping force of the high-voltage electrode (35) and the measuring electrode (34) on the core rod (8) to be measured.
3. The apparatus for measuring the volume resistivity of the core rod for an insulator according to claim 2, wherein the position adjusting member (37) includes:
the spring sleeve (371) is arranged on the high-voltage connecting plate (33), the high-voltage electrode (35) penetrates through the high-voltage connecting plate (33), and the first end of the high-voltage electrode (35) is arranged in the spring sleeve (371);
and the regulator (372) is arranged on the spring sleeve (371), is connected with the spring sleeve (371) in a sliding manner along the direction perpendicular to the length direction of the sleeve, and is used for locking the first end of the high-voltage electrode (35) to a preset position in the spring sleeve (371) so as to lock the high-voltage electrode (35) and the high-voltage connecting plate (33).
4. The apparatus for measuring a volume resistivity of a core rod for an insulator according to claim 3,
be equipped with the spring in spring sleeve (371), its cover is located outside high voltage electrode (35), be used for applying elastic pressure extremely on high-pressure connecting plate (33).
5. The apparatus for measuring a volume resistivity of a core rod for an insulator according to claim 1,
the temperature and humidity adjusting box (1) is provided with a high-pressure connecting piece which penetrates through the temperature and humidity adjusting box (1);
one end of the high-voltage connecting piece is connected with the high-voltage connecting plate (33), and the other end of the high-voltage connecting piece is used for being connected with a power supply.
6. The apparatus for measuring a volumetric resistivity of a core rod for an insulator according to any one of claims 1 to 5,
the volume resistivity tester (3) is adsorbed to the sliding guide rail (2) through magnetic force.
7. The apparatus for measuring a volumetric resistivity of a core rod for an insulator according to any one of claims 1 to 5,
and the sliding guide rail (2) is provided with a fixing piece (9) for supporting the volume resistivity tester (3).
8. The apparatus for measuring a volumetric resistivity of a core rod for an insulator according to any one of claims 1 to 5,
the side of temperature and humidity control case (1) is equipped with chamber door (12), its with the box of temperature and humidity control case (1) rotationally is connected for selectively sealed closure the box of temperature and humidity control case (1) is in order to form sealed test environment.
9. The apparatus for measuring a volumetric resistivity of a core rod for an insulator according to any one of claims 1 to 5,
and a leveling foot margin is arranged at the bottom of the temperature and humidity adjusting box (1) and used for adjusting the levelness of the temperature and humidity adjusting box (1).
10. The apparatus for measuring a volumetric resistivity of a core rod for an insulator according to any one of claims 1 to 5,
and a temperature and humidity controller is arranged on the temperature and humidity adjusting box (1) and is used for adjusting the temperature and humidity of the sealed test environment in the temperature and humidity adjusting box (1).
11. The apparatus for measuring a volume resistivity of a core rod for an insulator according to claim 10,
the temperature and humidity controller is provided with a display interface and a switch, and the display interface is used for setting and displaying the temperature and the humidity of the sealed test environment in the temperature and humidity adjusting box (1).
12. The apparatus for measuring a volumetric resistivity of a core rod for an insulator according to any one of claims 1 to 5, further comprising:
the data acquisition unit is used for acquiring the current flowing through the core rod (8) to be tested and the voltage at two ends of the core rod (8) to be tested, which are measured by the volume resistivity tester (3);
the processor is electrically connected with the data collector and is used for receiving the current flowing through the core rod to be tested (8) and the voltage at two ends of the core rod to be tested (8) acquired by the data collector and calculating to confirm the volume resistivity of the core rod to be tested (8);
and the memory is electrically connected with the processor and is used for storing the current flowing through the core rod (8) to be tested, the voltage at two ends of the core rod (8) to be tested, which is acquired by the data acquisition unit, and the volume resistivity of the core rod (8) to be tested, which is confirmed by the processor.
13. The apparatus for measuring a volumetric resistivity of a core rod for an insulator according to claim 12, further comprising:
and the display is connected with the memory or the processor and is used for displaying one or more of the current flowing through the core rod (8) to be tested, the voltage at two ends of the core rod (8) to be tested and the volume resistivity of the core rod (8) to be tested.
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| CN110058086B (en) * | 2019-04-28 | 2021-08-17 | 武汉大学 | Gas conductivity measuring device and method |
| CN112415274A (en) * | 2019-08-21 | 2021-02-26 | 西安高压电器研究院有限责任公司 | Insulating material volume resistivity measuring system and control method thereof |
| CN112505417B (en) * | 2020-11-19 | 2022-12-09 | 天津大学 | Method for measuring resistivity of conductor material |
| CN115616293B (en) * | 2022-09-14 | 2024-01-23 | 广州岭南电缆股份有限公司 | Volume resistivity measuring device for semiconductive buffer layer |
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