CN106249098B - Device and method for testing upper section leakage current of high-voltage lightning arrester - Google Patents
Device and method for testing upper section leakage current of high-voltage lightning arrester Download PDFInfo
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- CN106249098B CN106249098B CN201610716573.3A CN201610716573A CN106249098B CN 106249098 B CN106249098 B CN 106249098B CN 201610716573 A CN201610716573 A CN 201610716573A CN 106249098 B CN106249098 B CN 106249098B
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- arrester
- microammeter
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a high-voltage arrester upper section leakage current testing device and a testing method, wherein the device comprises a cutoff umbrella and a leakage current testing component, the cutoff umbrella is electrically connected with the leakage current testing component, the cutoff umbrella is detachably connected with the high-voltage arrester, the cutoff umbrella is arranged between a middle section flange, which is nearest to the upper section, of the high-voltage arrester and a grading ring of the high-voltage arrester, the cutoff umbrella is arranged on an insulating sleeve of the high-voltage arrester, when the high-voltage arrester upper section leakage current testing device is used, the cutoff umbrella is arranged on the insulating sleeve of the high-voltage arrester upper section, the current formed by a stray capacitor caused by the grading ring on the cutoff umbrella can be measured, the value of the current is equal to the interference current in the arrester, then the value of the current is subtracted when measured data is processed, more accurate leakage current data can be obtained, and meanwhile, the cutoff umbrella is detachably connected with the high-voltage arrester, and the measuring workload is reduced.
Description
Technical Field
The invention relates to the field of leakage current testing, in particular to a device and a method for testing upper section leakage current of a high-voltage lightning arrester.
Background
The high voltage arrester is connected between the cable and earth, typically in parallel with the protected equipment. The core component of the high-voltage arrester is a piezoresistor, the piezoresistor has nonlinear volt-ampere curve characteristic, under normal working voltage, the resistance value of the piezoresistor is very large, the current passing through the piezoresistor is only hundreds of microamps, and when the excessive voltage invades, the piezoresistor is approximately short-circuited, so that the overvoltage is quickly led into the ground through a grounding wire, the amplitude value of the system voltage is limited, and then the piezoresistor is quickly restored to a high-resistance state, so that the protection equipment is not broken down. Because the high-voltage lightning arrester has stray capacitance to the ground, the voltage distribution along the high-voltage lightning arrester is uneven, local breakdown is easy to occur at the place with high voltage, and damage is caused to the high-voltage lightning arrester. Therefore, the voltage distribution along the high-voltage lightning arrester can be uniform by adding the equalizing ring of the high-voltage lightning arrester, and breakdown can not occur.
The insulativity of the high-voltage lightning arrester is an important factor for judging whether the high-voltage lightning arrester is good or not under the operating voltage. The insulation of the high-voltage lightning arrester is mainly determined by testing the value of the leakage current of the high-voltage lightning arrester, the high-voltage lightning arrester is generally provided with an equalizing ring at the upper section, but stray capacitance exists between the equalizing ring and the upper section of the high-voltage lightning arrester due to the fact that the distance is relatively short, interference current is formed in an upper section circuit of the lightning arrester, the interference current caused by the equalizing ring and the upper section leakage current are measured together during experiments, the upper section leakage current is relatively large during field measurement, the insulation of the high-voltage lightning arrester is difficult to accurately reflect, and the main measures that the interference of the equalizing ring can be avoided are as follows: 1. the equalizing ring is removed during testing, and the method has large workload, needs special equipment and has certain danger; 2. shielding, the high-voltage shielding effect is poor, and the low-voltage shielding cannot be realized; 3. the artificial estimation is carried out, the environment where the high-voltage lightning arrester is located is different, and the estimation error is large.
Disclosure of Invention
Based on the problems, the invention aims to overcome the defects of the prior art and provide the high-voltage arrester upper section leakage current testing device and the high-voltage arrester upper section leakage current testing method which are easy to operate and accurate in measurement.
The technical scheme is as follows:
the utility model provides a section leakage current testing arrangement on high voltage arrester, includes the parachute and leakage current testing component, the parachute with leakage current testing component electric connection, the parachute can be dismantled with high voltage arrester and be connected, the parachute is located the high voltage arrester is between the nearest well section flange of section and the equalizer ring of high voltage arrester, the parachute is located on the insulating cover of high voltage arrester.
One technical scheme is further described as follows:
in one embodiment, the stop-flow umbrella comprises an inner ring, an outer ring and a rod piece, wherein the inner ring and the outer ring are sleeved outside the high-voltage lightning arrester, the inner diameter of the inner ring is smaller than that of the outer ring, the inner ring is arranged on the insulating sleeve, the inner ring is connected with the outer ring through the rod piece, and a metal wire is further connected between the inner ring and the outer ring.
In one embodiment, the outer ring is provided with a first fracture and a second fracture, the outer ring is disconnected at the first fracture and the second fracture, two ends of the first fracture are hinged, two ends of the second fracture are detachably connected through a fixing piece, and the inner ring is provided with a third fracture and a fourth fracture at positions corresponding to the first fracture and the second fracture.
In one embodiment, the outer ring is disposed between the equalizing ring and the middle section flange closest to the upper section, and the inner diameter of the outer ring is not smaller than the inner diameter of the equalizing ring.
In one embodiment, the inner ring, the outer ring and the rod are all of a conductive material.
In one embodiment, the insulation creepage distance between any part of the intercepting umbrella and the middle section flange closest to the upper section is larger than 80cm.
In one embodiment, the leakage current testing component comprises a direct current high-voltage generator, a first high-voltage microammeter, a second high-voltage microammeter and a third high-voltage microammeter, wherein the direct current high-voltage generator is electrically connected with a negative electrode interface of the first high-voltage microammeter, a positive electrode interface of the first high-voltage microammeter is electrically connected with a middle section flange nearest to the upper section, a negative electrode interface of the third high-voltage microammeter is electrically connected with a lower section flange of the high-voltage lightning arrester, a positive electrode interface of the third high-voltage microammeter is grounded, a negative electrode interface of the second high-voltage microammeter is connected with the intercepting umbrella, a positive electrode interface of the second high-voltage microammeter is grounded, and the voltage equalizing ring is grounded.
A method for testing leakage current of an upper section of a high-voltage arrester comprises the steps that a shutoff umbrella is arranged on an insulating sleeve of the high-voltage arrester, and the shutoff umbrella is arranged between a middle section flange, closest to the upper section, of the high-voltage arrester and a grading ring of the high-voltage arrester;
the direct current high voltage generator is electrically connected with a negative electrode interface of a first high voltage microammeter, a middle section flange with the nearest pitch on the high voltage arrester is electrically connected with a positive electrode interface of the first high voltage microammeter, a negative electrode interface of a second high voltage microammeter is electrically connected with the intercepting umbrella, the positive electrode interface of the second high voltage microammeter is grounded, a negative electrode interface of a third high voltage microammeter is electrically connected with a lower section flange of the high voltage arrester, the positive electrode interface of the third high voltage microammeter is grounded, and the voltage equalizing ring is grounded;
the direct current high-voltage generator is pressurized to obtain current values of the first high-voltage microammeter, the second high-voltage microammeter and the third high-voltage microammeter respectively;
and subtracting the current values measured by the second high-voltage microammeter and the third high-voltage microammeter from the current values measured by the first high-voltage microammeter respectively to obtain the upper section leakage current of the high-voltage lightning arrester.
The invention has the following beneficial effects:
the high-voltage arrester upper section leakage current testing device is characterized in that the intercepting umbrella is arranged on an insulating sleeve of the arrester upper section, the current formed by the stray capacitance caused by the equalizing ring on the intercepting umbrella is measured, the current is equal to the interference current in value, then the value of the current is subtracted when experimental data are processed, more accurate leakage current data can be obtained, the intercepting umbrella is detachably connected with the arrester, the use is convenient, and the workload of measurement work is reduced.
The method for testing the leakage current of the upper section of the high-voltage arrester changes the traditional interference current in the upper section of the arrester from shielding into measurement, discards a series of procedures required by shielding the interference current, greatly simplifies testing work, and meanwhile, the current measured by the intercepting umbrella is equal to the interference current in the upper section of the high-voltage arrester, and is more accurate than the current value of the upper section of the arrester measured by a shielding mode.
Drawings
FIG. 1 is an installation diagram of a high voltage arrester upper section leakage current testing device;
FIG. 2 is a schematic diagram of a structure of a shut-off umbrella;
FIG. 3 is a schematic side view of a lateral structure of a closure umbrella;
FIG. 4 is a schematic cross-sectional view of a first fracture;
fig. 5 is a schematic partial cross-sectional view of a second fracture.
Reference numerals illustrate:
100. the device comprises a shut-off umbrella, 110, an inner ring, 120, an outer ring, 130, rod pieces, 140, metal wires, 150, fixing pieces, 200, a leakage current testing assembly, 210, a direct current high-voltage generator, 220, a first high-voltage microammeter, 230, a second high-voltage microammeter, 240, a third high-voltage microammeter, 300, a grading ring, 400 and a high-voltage lightning arrester.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the embodiment, the 500kV lightning arrester is used as a test object, but the upper section leakage current test device of the high-voltage lightning arrester is also applicable to other high-voltage lightning arresters.
As shown in fig. 1, the device for testing the leakage current of the upper section of the 500kV arrester 400 comprises a stop umbrella 100 and a leakage current testing assembly 200, wherein the stop umbrella 100 is electrically connected with the leakage current testing assembly 200, the stop umbrella 100 is detachably connected with the 500kV arrester 400, the stop umbrella 100 is arranged between a middle section flange of the 500kV arrester 400 closest to the upper section and a grading ring 300 of the 500kV arrester 400, and the stop umbrella 100 is arranged on an insulating sleeve of the 500kV arrester 400. The grading ring 300 can average the voltage around the 500kV arrester 400, so that the 500kV arrester 400 is protected from breakdown, but stray capacitance can be formed between the grading ring 300 and the upper section of the 500kV arrester 400, the stray capacitance forms interference current in the 500kV arrester 400, the result of the upper section leakage current experiment is influenced, the judgment of the state of the 500kV arrester 400 is misled, the current value of the same stray capacitance formed on the grading ring 100 can be measured by forming a capacitance structure with the grading ring 300 by the grading ring 100, the current is similar to the interference current in value, and the interference of the interference current caused by the grading ring 300 can be removed in subsequent measurement data processing.
As shown in fig. 2, the intercepting umbrella 100 comprises an inner ring 110, an outer ring 120 and a rod member 130, wherein the inner ring 110 and the outer ring 120 are sleeved outside a 500kV lightning arrester 400, the inner diameter of the inner ring 110 is smaller than that of the outer ring 130, the inner ring 110 is arranged on an insulating sleeve, the inner ring 110 and the outer ring 120 are connected through the rod member, a metal wire 140 is further connected between the inner ring 110 and the outer ring 120, and the metal wire 140 is used for guiding current, so that the voltages at all positions on the intercepting umbrella 100 are consistent.
As shown in fig. 3, the outer ring 120 is provided with a first fracture and a second fracture, the outer ring 120 is disconnected at the first fracture and the second fracture, as shown in fig. 4, two ends of the first fracture are hinged, as shown in fig. 5, two ends of the second fracture are detachably connected through a fixing piece 150, and the inner ring 110 is provided with a third fracture and a fourth fracture at positions corresponding to the first fracture and the second fracture. In the test preparation stage, the fixing piece 150 of the second fracture is detached, the stop-flow umbrella 100 is opened, two parts of the inner ring 110 are respectively abutted in the groove of the insulating sleeve of the 500kV lightning arrester 400, two parts of the stop-flow umbrella 100 are closed again, and two ends of the second fracture are fixed by the fixing piece 150.
As shown in fig. 1, the outer ring 120 is disposed between the equalizing ring 300 and the middle-section flange nearest to the upper section, and the inner diameter of the outer ring 120 is not smaller than the inner diameter of the equalizing ring 300, so as to ensure that the value of the current measured on the intercepting umbrella 100 and caused by the stray capacitance is similar to the value of the interference current caused by the stray capacitance inside the upper section of the 500kV lightning arrester 400.
Since the umbrella 100 generates current by inducing stray capacitance, the inner ring 110, the outer ring 120 and the rod 130 are all conductive materials.
When the leakage current test is performed, the direct current high voltage generator 210 is pressurized on the middle section flange closest to the upper section through a wire, so that in order to prevent high voltage discharge between the stop-flow umbrella 100 and the middle section flange closest to the upper section due to excessive pressure difference, the insulation creepage distance between any part on the stop-flow umbrella 100 and the middle section flange closest to the upper section is larger than 80cm.
Because the negative polarity direct current is used in the experiment, as shown in fig. 1, the direct current high voltage generator 210 is connected with the negative electrode interface of the first high voltage microammeter 220 through a wire, the positive electrode interface of the first high voltage microammeter 220 is arranged at the middle section flange nearest to the upper section of the 500kV lightning arrester 400 through a wire, the negative electrode interface of the third high voltage microammeter 240 is connected with the lower section flange of the 500kV lightning arrester 400, the positive electrode interface of the third high voltage microammeter 240 is grounded through a wire, the negative electrode interface of the second high voltage microammeter 230 is connected with the intercepting umbrella 100, the positive electrode interface of the second high voltage microammeter 230 is grounded through a wire, and the equalizing ring 300 is grounded through a wire.
The method for testing the leakage current of the upper section of the 500kV lightning arrester 400 comprises the following steps:
firstly, arranging a stop-flow umbrella 100 on an insulating sleeve of a 500kV arrester 400, wherein the stop-flow umbrella 100 is arranged between a middle section flange of the 500kV arrester 400 nearest to an upper section and a grading ring 300 of the 500kV arrester 400;
secondly, connecting the leakage current testing assembly 200, electrically connecting the direct current high-voltage generator 210 with the negative electrode interface of the first high-voltage microammeter 220, electrically connecting the positive electrode interface of the first high-voltage microammeter 220 with the middle section flange nearest to the upper section, connecting the negative electrode interface of the second high-voltage microammeter 230 with the intercepting umbrella 100, connecting the positive electrode interface of the second high-voltage microammeter 230 with the ground, connecting the negative electrode interface of the third high-voltage microammeter 240 with the lower section flange of the 500kV lightning arrester 400, connecting the positive electrode interface of the third high-voltage microammeter 240 with the ground, and connecting the equalizing ring 300 with the ground;
then, the direct current high voltage generator 210 is used for pressurizing to obtain current values of the first high voltage microammeter 220, the second high voltage microammeter 230 and the third high voltage microammeter 240 respectively;
finally, subtracting the current values measured by the second high voltage microammeter 230 and the third high voltage microammeter 240 from the current value measured by the first high voltage microammeter 220 to obtain the upper section leakage current of the 500kV lightning arrester 400.
The first high voltage microammeter 220 measures the total current I in the circuit 1 The third high voltage microammeter 240 measures the leakage current I passing through the arrester except the upper section 3 The second high voltage microammeter 230 measures the current I formed by the stray capacitance on the umbrella 100 2 The value of the interference current is equal to the interference current formed by the stray capacitance in the upper section of the 500kV arrester 400, and the value measured by the second high-voltage microammeter 230 and the third high-voltage microammeter 240 is subtracted from the value measured by the first high-voltage microammeter 220, i.e. i=i 1 -I 2 -I 3 Leakage current of the upper section of the 500kV arrester 400 can be obtained.
At 0.75 times the DC reference voltageFor example, the leakage current test is performed by continuously pressurizing the circuit with the dc high voltage generator 210, and recording the voltage U when the reading of the first high voltage microammeter 220 reaches 1mA 1mA Then depressurized and 0.75U calculated 1mA Is pressurized to 0.75U again using the DC high voltage generator 210 1mA The readings of each high voltage microammeter at this time were recorded and the calculation formula i=i was used 1 -I 2 -I 3 And obtaining leakage current of the upper section of the 500kV lightning arrester 400, and comparing the leakage current with standard data to know the insulation condition of the 500kV lightning arrester 400.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the present invention should be determined by the following claims.
Claims (7)
1. The upper section leakage current testing device of the high-voltage arrester is characterized by comprising a shutoff umbrella and a leakage current testing assembly, wherein the shutoff umbrella is electrically connected with the leakage current testing assembly, the shutoff umbrella is detachably connected with the high-voltage arrester, the shutoff umbrella is arranged between a middle section flange, closest to the upper section, of the high-voltage arrester and a grading ring of the high-voltage arrester, and the shutoff umbrella is arranged on an insulating sleeve of the high-voltage arrester;
the leakage current testing assembly comprises a direct current high-voltage generator, a first high-voltage microammeter, a second high-voltage microammeter and a third high-voltage microammeter, wherein the direct current high-voltage generator is electrically connected with a negative electrode interface of the first high-voltage microammeter, a positive electrode interface of the first high-voltage microammeter is electrically connected with a middle section flange nearest to an upper section, a negative electrode interface of the third high-voltage microammeter is electrically connected with a lower section flange of a high-voltage arrester, a positive electrode interface of the third high-voltage microammeter is grounded, a negative electrode interface of the second high-voltage microammeter is connected with the intercepting umbrella, a positive electrode interface of the second high-voltage microammeter is grounded, and the voltage equalizing ring is grounded;
the current value formed by the stray capacitance on the intercepting umbrella can be measured by the leakage current testing assembly.
2. The high-voltage arrester upper section leakage current testing device according to claim 1, wherein the intercepting umbrella comprises an inner ring, an outer ring and a rod piece, the inner ring and the outer ring are sleeved outside the high-voltage arrester, the inner diameter of the inner ring is smaller than that of the outer ring, the inner ring is arranged on the insulating sleeve, the inner ring and the outer ring are connected through the rod piece, and a metal wire is further connected between the inner ring and the outer ring.
3. The high-voltage arrester upper section leakage current testing device according to claim 2, wherein a first fracture and a second fracture are arranged on the outer ring, the outer ring is disconnected at the first fracture and the second fracture, two ends of the first fracture are hinged, two ends of the second fracture are detachably connected through a fixing piece, and a third fracture and a fourth fracture are arranged at positions corresponding to the first fracture and the second fracture of the inner ring.
4. The high-voltage arrester upper section leakage current testing device according to claim 2, wherein the outer ring is provided between the equalizing ring and the middle section flange nearest to the upper section, and an inner diameter of the outer ring is not smaller than an inner diameter of the equalizing ring.
5. The high voltage arrester upper section leakage current testing apparatus of claim 2, wherein the inner ring, outer ring and rod members are all of conductive material.
6. The high-voltage arrester upper section leakage current testing device according to claim 2, wherein the insulation creepage distance between any part on the intercepting umbrella and the middle section flange nearest to the upper section is larger than 80cm.
7. A method for testing the leakage current of the upper section of a high-voltage lightning arrester is characterized in that,
the method comprises the steps that a stop-flow umbrella is arranged on an insulating sleeve of a high-voltage arrester, and the stop-flow umbrella is arranged between a middle section flange, closest to an upper section, of the high-voltage arrester and a grading ring of the high-voltage arrester;
the direct current high voltage generator is electrically connected with a negative electrode interface of a first high voltage microammeter, a middle section flange with the nearest pitch on the high voltage arrester is electrically connected with a positive electrode interface of the first high voltage microammeter, a negative electrode interface of a second high voltage microammeter is electrically connected with the intercepting umbrella, the positive electrode interface of the second high voltage microammeter is grounded, a negative electrode interface of a third high voltage microammeter is electrically connected with a lower section flange of the high voltage arrester, the positive electrode interface of the third high voltage microammeter is grounded, and the voltage equalizing ring is grounded;
the direct current high-voltage generator is pressurized to obtain current values of the first high-voltage microammeter, the second high-voltage microammeter and the third high-voltage microammeter respectively;
and subtracting the current values measured by the second high-voltage microammeter and the third high-voltage microammeter from the current values measured by the first high-voltage microammeter respectively to obtain the upper section leakage current of the high-voltage lightning arrester.
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| CN107167698B (en) * | 2017-07-20 | 2020-02-07 | 云南电网有限责任公司电力科学研究院 | Lightning arrester leakage current live-line test device and method |
| CN107329032B (en) * | 2017-07-20 | 2019-09-17 | 北京送变电公司 | Arrester direct current leakage test device |
| CN109870598A (en) * | 2019-03-28 | 2019-06-11 | 国家电网有限公司 | A kind of arrester Leakage Current test connection system and test method |
| CN111257604A (en) * | 2020-04-09 | 2020-06-09 | 国家电网有限公司 | Upper section test wiring device for 500kV and above voltage level lightning arrester |
| CN112066516B (en) * | 2020-08-03 | 2021-08-20 | 珠海格力电器股份有限公司 | Air conditioner, fault self-diagnosis method, external unit positioning fault method and remote controller |
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