CN111812458A - Method for testing temporary overvoltage limit tolerance characteristic of lightning arrester of direct current transfer switch - Google Patents

Method for testing temporary overvoltage limit tolerance characteristic of lightning arrester of direct current transfer switch Download PDF

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CN111812458A
CN111812458A CN202010436020.9A CN202010436020A CN111812458A CN 111812458 A CN111812458 A CN 111812458A CN 202010436020 A CN202010436020 A CN 202010436020A CN 111812458 A CN111812458 A CN 111812458A
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overvoltage
direct current
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CN111812458B (en
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卢文浩
韦晓星
楚金伟
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Maintenance and Test Center of Extra High Voltage Power Transmission Co
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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
    • G01R31/1236—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 surge arresters

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Abstract

The invention discloses a method for testing the transient overvoltage limit tolerance characteristic of a direct current transfer switch arrester, which mainly comprises an initial value measuring step, a transient overvoltage tolerance testing step and a test judging step. According to the temporary overvoltage limit tolerance test method provided by the invention, multiple temporary overvoltage withstand voltage tests are carried out under test waveforms with different wavelengths, and the transient overvoltage multiple is adjusted according to different test results, so that the accurate temporary overvoltage limit tolerance multiple of the direct current transfer switch lightning arrester can be obtained, a configuration basis can be provided for the design of the direct current transfer switch lightning arrester, and the operation reliability of the lightning arrester in the direct current system conversion process is improved.

Description

Method for testing temporary overvoltage limit tolerance characteristic of lightning arrester of direct current transfer switch
Technical Field
The invention relates to high-voltage maintenance equipment, in particular to a method for testing the transient overvoltage limit tolerance characteristic of a lightning arrester of a direct-current transfer switch.
Background
During the bipolar operation of the direct current system, if the monopolar locking occurs, the sound pole forms the monopolar earth return line operation through the earth pole and the earth return circuit, and at the moment, thousands of amperes of direct current are injected into the earth pole, so that the safe operation of the peripheral transformer and the oil and gas pipeline is influenced. In order to reduce the running time of the single-pole ground return wire, the single-pole ground return wire is converted into a single-pole metal return wire to run as soon as possible; and when the fault is eliminated, the switching-off pole valve group unlocking program can be executed after the single pole metal is converted into the ground return wire, and the switching-off pole is recovered to supply power. However, in domestic direct current engineering, the situation of multiple conversion failures occurs, the reason of the conversion failures is that the temporary overvoltage tolerance capability of the arrester resistance card is insufficient, and the power frequency overvoltage tolerance test method specified by the existing arrester standard is insufficient and is not enough to effectively check the temporary overvoltage tolerance characteristic of the arrester resistance card.
Disclosure of Invention
The invention provides a method for testing the temporary overvoltage limit tolerance characteristic of a direct current transfer switch arrester, aiming at solving the technical problem that the existing power frequency overvoltage tolerance test method specified by the arrester standard is insufficient.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for testing the transient overvoltage limit tolerance characteristic of a direct current transfer switch lightning arrester comprises the following steps:
an initial value measuring step: selecting N new valve plates as a test sample, measuring the direct current 1mA reference voltage, the leakage current under 0.75 time of the reference voltage and the residual voltage under the impact current of 500A operation of all the valve plates, and recording the values as initial values;
temporary overvoltage tolerance test procedure: sequentially carrying out n times of temporary overvoltage tolerance tests on the test sample under test waveforms with different wavelengths; the transient overvoltage multiple is KnThe nth temporary overvoltage withstand test is shown;
and (3) test judgment:
if the nth test fails, skipping the step of measuring the initial value, and carrying out the (n + 1) th test and the transient overvoltage multiple Kn+1＝Kn-0.02；
If the nth test is passed and the (n-1) th test is passed, skipping the step of measuring the initial value, carrying out the (n + 1) th test, and selecting the transient overvoltage multiple Kn+1＝Kn+0.02。
If the nth test is passed and the (n-1) th test is not passed, the temporary overvoltage limit tolerance multiple of the lightning arrester valve plate is determined to be K ═ Kn-1；
Wherein N and N are both positive integers.
Further, the test article was subjected to n times of temporary overvoltage withstand tests under 7 test waveforms of 10ms, 40ms, 70ms, 100ms, 150ms, 200ms, and 300ms wavelengths.
Further, in the temporary overvoltage withstand test step, at the 1 st test, K1The limiting temporary overvoltage multiple provided by each wavelength in the following table was selected:
Figure BDA0002502280740000021
further, in the test judging step, the test failure means that any test article has flashover or breakdown phenomenon in the test process.
Further, in the test judging step, the passing of the test means that no flashover or breakdown occurs in all the test articles in the test process.
Compared with the prior art, the invention has the beneficial effects that:
according to the temporary overvoltage limit tolerance test method provided by the invention, multiple temporary overvoltage withstand voltage tests are carried out under test waveforms with different wavelengths, and the transient overvoltage multiple is adjusted according to different test results, so that the accurate temporary overvoltage limit tolerance multiple of the direct current transfer switch lightning arrester can be obtained, a configuration basis can be provided for the design of the direct current transfer switch lightning arrester, and the operation reliability of the lightning arrester in the direct current system conversion process is improved.
Drawings
Fig. 1 is a flowchart of a method for testing a transient overvoltage limit withstand characteristic of a dc transfer switch arrester according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of voltage and current waveforms for a wavelength of 100 ms.
Detailed Description
Example (b):
the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
The method for testing the transient overvoltage limit tolerance characteristic of the direct current transfer switch arrester mainly comprises an initial value measuring step, a transient overvoltage tolerance testing step and a test judging step. As shown in fig. 1, the method specifically includes the following steps:
an initial value measuring step: selecting 20 new valve plates as a test sample, measuring the direct current 1mA reference voltage, the leakage current under 0.75 time of the reference voltage and the residual voltage under the impact current of 500A operation of all the valve plates, and recording the values as initial values;
temporary overvoltage tolerance test procedure: the test article was subjected to temporary overvoltage withstand tests under 7 test waveforms of 10ms, 40ms, 70ms, 100ms, 150ms, 200ms, and 300ms wavelengths in this order. Over-voltage multiple of KnThe nth temporary overvoltage withstand test is shown.
And (3) test judgment:
if the nth test fails, selecting 20 new lightning arrester valve plates, namely, skipping the measurement step of the initial value, carrying out the (n + 1) th test, and obtaining the transient overvoltage multiple Kn+1＝Kn-0.02。
If the nth test is passed and the (n-1) th test is passed, skipping the step of measuring the initial value, carrying out the (n + 1) th test, and selecting the transient overvoltage multiple Kn+1＝Kn+0.02。
If the nth test is passed and the (n-1) th test is not passed, the temporary overvoltage limit tolerance multiple of the lightning arrester valve plate is determined to be K ═ Kn-1。
Further, in the temporary overvoltage withstand test step, at the 1 st test, K1The limiting temporary overvoltage multiple provided by each wavelength in the following table was selected:
Figure BDA0002502280740000031
further, in the test judging step, the test failure means that any test article has flashover or breakdown phenomenon in the test process.
Further, in the test judging step, the passing of the test means that no flashover or breakdown occurs in all the test articles in the test process.
At each test, the test waveform should be recorded, and the voltage, current and temperature of the resistance card should be measured. Before and after the test, the direct current 1mA reference voltage and the leakage current of the resistance card under 0.75 time of the reference voltage are tested, and the residual voltage under 500A of impact current is operated. The test should eliminate the breakdown or flashover caused by tools and other reasons during the test.
According to the temporary overvoltage limit tolerance test method provided by the invention, multiple temporary overvoltage withstand voltage tests are carried out under test waveforms with different wavelengths, and the transient overvoltage multiple is adjusted according to different test results, so that the accurate temporary overvoltage limit tolerance multiple of the direct current transfer switch lightning arrester can be obtained, a configuration basis can be provided for the design of the direct current transfer switch lightning arrester, and the operation reliability of the lightning arrester in the direct current system conversion process is improved.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.

Claims (5)

1. A method for testing the transient overvoltage limit tolerance characteristic of a direct current transfer switch lightning arrester is characterized by comprising the following steps:
an initial value measuring step: selecting N new valve plates as samples, measuring the direct current 1mA reference voltage, the leakage current under 0.75 time of the reference voltage and the residual voltage under the impact current of 500A operation of all the valve plate samples, and recording the values as initial values;
temporary overvoltage tolerance test procedure: sequentially carrying out n times of temporary overvoltage tolerance tests on the test sample under test waveforms with different wavelengths; the transient overvoltage multiple is KnThe nth temporary overvoltage withstand test is shown;
and (3) test judgment:
if the nth test fails, skipping the step of measuring the initial value, and carrying out the (n + 1) th test and the transient overvoltage multiple Kn+1＝Kn-0.02；
If the nth test is passed and the (n-1) th test is passed, skipping the step of measuring the initial value, carrying out the (n + 1) th test, and selecting the transient overvoltage multiple Kn+1＝Kn+0.02；
If the nth test is passed and the (n-1) th test is not passed, the temporary overvoltage limit tolerance multiple of the lightning arrester valve plate is determined to be K ═ Kn-1；
Wherein N and N are both positive integers.
2. The method for testing the temporary overvoltage limit withstand characteristic of a dc transfer switching arrestor as set forth in claim 1, wherein the test pieces are subjected to n times of temporary overvoltage withstand tests under 7 test waveforms having wavelengths of 10ms, 40ms, 70ms, 100ms, 150ms, 200ms, and 300 ms.
3. The method for testing the transient overvoltage limit withstand characteristic of a dc transfer switching arrestor as set forth in claim 2, wherein K is set at the time of the 1 st test in the transient overvoltage withstand test step1The limiting temporary overvoltage multiple provided by each wavelength in the following table was selected:
Figure FDA0002502280730000011
4. the method for testing the transient overvoltage limit withstand characteristic of a dc transfer switching arrestor as set forth in claim 1, wherein the failure of the test in the step of determining the test means that any one of the test pieces is in flashover or breakdown during the test.
5. The method for testing the transient overvoltage limit withstand characteristic of a dc transfer switching arrestor as set forth in claim 1, wherein the test passing in the test judging step means that no flashover or breakdown occurs in all the test pieces during the test.
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CN111722065A (en) * 2020-05-21 2020-09-29 中国南方电网有限责任公司超高压输电公司检修试验中心 Limit energy tolerance test method for resistor disc of lightning arrester of direct current transfer switch
CN114166270A (en) * 2021-11-08 2022-03-11 广州中光电气科技有限公司 Method for measuring action characteristic parameters of disconnector

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CN111722065A (en) * 2020-05-21 2020-09-29 中国南方电网有限责任公司超高压输电公司检修试验中心 Limit energy tolerance test method for resistor disc of lightning arrester of direct current transfer switch
CN111722065B (en) * 2020-05-21 2021-08-31 中国南方电网有限责任公司超高压输电公司检修试验中心 Limit energy tolerance test method for resistor disc of lightning arrester of direct current transfer switch
CN114166270A (en) * 2021-11-08 2022-03-11 广州中光电气科技有限公司 Method for measuring action characteristic parameters of disconnector

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