CN107219419B - Rapid degradation method and system for ultra-high voltage and extra-high voltage lightning arrester - Google Patents
Rapid degradation method and system for ultra-high voltage and extra-high voltage lightning arrester Download PDFInfo
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- CN107219419B CN107219419B CN201710383443.7A CN201710383443A CN107219419B CN 107219419 B CN107219419 B CN 107219419B CN 201710383443 A CN201710383443 A CN 201710383443A CN 107219419 B CN107219419 B CN 107219419B
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- 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
- G01R31/003—Environmental or reliability tests
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Abstract
A method and a system for rapidly degrading an ultra-high voltage arrester, wherein the method comprises the following steps: s1: firstly, disassembling the lightning arrester, and selecting the number of breakdown valve plates according to the degradation degree of the lightning arrester; s2: the valve plates are serially connected into the impact current generator as resistors one by one, so that the impact current generator outputs current waves, and a plurality of impact tests are continuously carried out; s3: preparing electrolyte solution, heating the valve plate in the electrolyte solution to a certain temperature, keeping the constant temperature and standing for a period of time, taking out and assembling, pouring a certain amount of electrolyte solution into the porcelain bottle, and packaging. The system is used for implementing the method. The invention has the advantages of simple operation, simple principle, capability of rapidly deteriorating the action characteristic of the valve plate of the lightning arrester, and making the interior of the lightning arrester be entirely wet, etc.
Description
Technical Field
The invention mainly relates to the field of lightning arresters, in particular to a method and a system for rapidly degrading an ultra-high voltage lightning arrester.
Background
There are two main reasons for the performance degradation of existing extra-high and extra-high voltage arresters: 1) The lightning arrester is in a sun-drying and rain-spraying environment for a long time due to the fact that the lightning arrester is poor in sealing, the valve plates are not thoroughly dried, the inner porcelain bowl is broken or the outer porcelain sleeve is damaged due to impact vibration in transportation, and moisture in the air permeates and accumulates to make the inside of the lightning arrester wet. 2) In the long-term operation process, the power frequency current continuously flows through the zinc oxide arrester resistor valve plate, and the aging characteristic of individual valve plates is poor, so that the potential distribution is uneven, part of valve plates are aged first, the reference voltage of the arrester is reduced, the resistive current and the power loss are increased, vicious circulation is formed, and finally the overall aging of the arrester is caused.
From the above, the performance degradation of the lightning arrester is a long-term and slow process of the equipment during the operation, and the time is less than several months and more than several years, and the lightning arrester is often required to be degraded to different degrees in a short period of time for laboratory lightning arrester research. Therefore, a rapid deterioration of the lightning arrester is required for a short period of time, and a system device capable of rapidly deteriorating the lightning arrester is required. To realize rapid deterioration of the arrester, namely rapid ageing of the arrester valve plate and internal wetting of the arrester, the voltage borne by the valve plate must be increased and the contact between the arrester and the electrolyte solution must be increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems existing in the prior art, the invention provides the method and the system for rapidly deteriorating the ultra-high voltage and extra-high voltage lightning arrester, which are simple and convenient to operate and simple in principle, and can rapidly deteriorate the action characteristics of the valve plate of the lightning arrester and make the interior of the lightning arrester entirely wet.
In order to solve the technical problems, the invention adopts the following technical scheme:
a rapid degradation method for an ultra-high voltage arrester comprises the following steps:
s1: firstly, disassembling the lightning arrester, and selecting the number of breakdown valve plates according to the degradation degree of the lightning arrester;
s2: the valve plates are serially connected into the impact current generator as resistors one by one, so that the impact current generator outputs current waves with the current waveform of 8/20 mu s, and impact tests are continuously carried out for a plurality of times;
s3: preparing electrolyte solution, heating the valve plate in the electrolyte solution to a certain temperature, keeping the constant temperature and standing for a period of time, taking out and assembling, pouring a certain amount of electrolyte solution into the porcelain bottle, and packaging.
As a further improvement of the above technical scheme:
as a further improvement of the process of the invention: the amplitude of the current wave is set to be 1.5 times of the valve plate current surge withstand current.
As a further improvement of the process of the invention: the number of impact tests is 15 to 25.
As a further improvement of the process of the invention: the electrolyte solution is heated to 75-82 ℃ in the step S3.
As a further improvement of the process of the invention: in the step S1, when the number of valve plates is selected, 6 to 15 sheets are selected when light degradation is performed, 16 to 25 sheets are selected when general degradation is performed, 26 to 35 sheets are selected when serious degradation is performed, and 35 to 45 sheets are selected when heavy degradation is performed.
The invention further provides a rapid degradation system of an ultra-high voltage arrester, which comprises an impact current generator and a constant temperature box, wherein electrolyte solution is filled in the constant temperature box, the impact current generator comprises a step-up transformer, a rectifying silicon stack, a protection resistor, a capacitor bank, a discharge gap, a loop inductance, a shunt, a wave regulating resistor, a voltage divider and an oscilloscope, and after a valve plate of the arrester is used as a load to be connected into the impact current generator in series, the wave regulating resistor is regulated to enable the impact current generator to output impact current waves, and a plurality of impact tests are continuously carried out; and the lightning arrester valve plate after the impact test is finished is arranged in an incubator.
As a further improvement of the system of the invention: the surge current generator outputs a surge current wave with a waveform of 8/20 mu s.
As a further improvement of the system of the invention: the conductivity of the electrolyte solution is 10-200 mu s/cm,
as a further improvement of the system of the invention: the incubator is used for holding a volume of 20-50L of electrolyte solution and maintaining the temperature at 80 ℃.
Compared with the prior art, the invention has the advantages that: the method and the system for rapidly degrading the ultra-high voltage arrester are simple and convenient to operate and simple in principle, and can rapidly degrade the action characteristics of the valve plate of the arrester, so that the inside of the arrester is entirely wetted.
Drawings
Fig. 1 is a flow chart of the rapid degradation method of the extra-high and extra-high voltage lightning arrester.
Fig. 2 is a schematic structural diagram of an impact current generator in the rapid degradation system of the extra-high voltage arrester of the present invention.
Fig. 3 is a schematic structural diagram of an incubator in the rapid deterioration system of the extra-high voltage arrester of the present invention.
Legend description:
1. a step-up transformer; 2. a rectifying silicon stack; 3. a protection resistor; 4. a capacitor bank; 5. a discharge gap; 6. loop inductance; 7. a shunt; 8. a wave-regulating resistor; 9. a lightning arrester valve plate; 10. a voltage divider; 11. an oscilloscope; 12. an electrolyte solution; 13. a constant temperature box.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific examples.
As shown in fig. 1, the method for rapidly degrading the ultra-high voltage and extra-high voltage lightning arrester comprises the following steps:
s1: firstly, disassembling the lightning arrester, and selecting the number of breakdown valve plates according to the degradation degree of the lightning arrester;
in a specific use example, the single section of a lightning arrester of 500kV is composed of 45 zinc oxide valve plates, 6-15 zinc oxide valve plates can be selected when the lightning arrester is slightly deteriorated, 16-25 zinc oxide valve plates can be selected when the lightning arrester is generally deteriorated, 26-35 zinc oxide valve plates can be selected when the lightning arrester is severely deteriorated, and 35-45 zinc oxide valve plates can be selected when the lightning arrester is severely deteriorated.
S2: the valve plates are serially connected into the impact current generator one by one as resistors, the wave-regulating resistor is regulated to enable the current waveform output by the impact current generator to be 8/20 mu s of current wave, the amplitude is set to be 1.5 times of the large-current impact tolerance current of the valve plates, and a plurality of impact tests are continuously carried out.
In a specific application example, 15 to 25 tests, such as 20 tests, can be selected according to actual needs.
S3: preparing electrolyte solution 12, placing the valve plate into the electrolyte solution 12, heating to a certain temperature, keeping constant temperature, standing for a period of time, taking out, assembling, pouring a certain amount of electrolyte solution 12 into the porcelain bottle, and packaging.
In a specific application example, the electrolyte solution 12 with the temperature of 75-82 ℃ can be selected according to actual needs, for example, the electrolyte solution 12 with the temperature of 80 ℃ is selected, and the mixture is kept at a constant temperature for 24 hours.
As shown in fig. 2 and 3, the invention further discloses a rapid degradation system of an ultra-high voltage arrester, which comprises an impact current generator and a constant temperature box 13, wherein electrolyte solution 12 is filled in the constant temperature box 13, the impact current generator comprises a step-up transformer 1, a rectifying silicon stack 2, a protection resistor 3, a capacitor bank 4, a discharge gap 5, a loop inductor 6, a shunt 7, a wave regulating resistor 8, a voltage divider 10 and an oscilloscope 11, after a valve plate 9 of the arrester is used as a load to be connected into the impact current generator in series, the wave regulating resistor 8 is regulated to enable the impact current generator to output impact current waves, and a plurality of impact tests are continuously carried out; the lightning arrester valve plate 9 after the impact test is finished is arranged in the incubator 13.
In a specific application example, the rush current generator outputs a rush current wave having a waveform of 8/20. Mu.s.
In a specific application example, the electrolyte solution 12 has a conductivity of 10 to 200. Mu.s/cm, and the incubator 13 can be used to hold a volume of 20 to 50L of the solution.
In a specific application example, the incubator 13 can hold the electrolyte solution 12 and maintain the temperature at 80 ℃.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (10)
1. A rapid degradation method for an ultra-high voltage arrester is characterized by comprising the following steps:
s1: firstly, disassembling the lightning arrester, and selecting the number of breakdown valve plates according to the degradation degree of the lightning arrester;
s2: the valve plates are serially connected into the impact current generator as resistors one by one, so that the impact current generator outputs current waves, and a plurality of impact tests are continuously carried out;
s3: preparing electrolyte solution, heating the valve plate in the electrolyte solution to a certain temperature, keeping the constant temperature and standing for a period of time, taking out and assembling, pouring a certain amount of electrolyte solution into the porcelain bottle, and packaging.
2. The rapid deterioration method of an ultra-high voltage arrester according to claim 1, wherein the amplitude of the current wave is set to 1.5 times the valve sheet current surge withstand current.
3. The rapid deterioration method of ultra-high voltage and extra-high voltage arresters according to claim 1, wherein the number of impact tests is 15 to 25.
4. The rapid deterioration method of extra-high voltage and extra-high voltage arresters according to claim 1, wherein the electrolyte solution is heated to 75-82 ℃ in step S3.
5. The rapid deterioration method for extra-high voltage and extra-high voltage arresters according to any one of claims 1 to 4, wherein in the step S1, 6 to 15 pieces are selected when the light deterioration is performed, 16 to 25 pieces are selected when the general deterioration is performed, 26 to 35 pieces are selected when the heavy deterioration is performed, and 35 to 45 pieces are selected when the heavy deterioration is performed, when the number of valve plates is selected.
6. The rapid degradation system for the ultra-high voltage arrester is characterized by comprising an impact current generator and an incubator (13), wherein electrolyte solution (12) is filled in the incubator (13), the impact current generator comprises a step-up transformer (1), a rectifying silicon stack (2), a protection resistor (3), a capacitor bank (4), a discharge gap (5), a loop inductor (6), a shunt (7), a wave-regulating resistor (8), a voltage divider (10) and an oscilloscope (11), the arrester is disassembled firstly, and the number of breakdown valve plates is selected according to the degradation degree of the arrester; after a lightning arrester valve plate (9) of the lightning arrester is used as a load to be connected into the impact current generator in series, the surge adjusting resistor (8) is adjusted to enable the impact current generator to output impact current waves, and a plurality of impact tests are continuously carried out; preparing electrolyte solution, heating the valve plate in the electrolyte solution to a certain temperature, keeping the constant temperature and standing for a period of time, taking out and assembling, pouring a certain amount of electrolyte solution into the porcelain bottle, and packaging; the lightning arrester valve plate (9) after the impact test is finished is arranged in the constant temperature box (13).
7. The rapid deterioration system of extra-high voltage and extra-high voltage arresters according to claim 6, wherein the surge current generator outputs a surge current wave having a waveform of 8/20 μs.
8. The rapid deterioration system for an ultra-high voltage arrester according to claim 6, wherein the electrolyte solution (12) has a conductivity of 10 to 200 μs/cm.
9. The rapid deterioration system for extra-high voltage and extra-high voltage arresters according to claim 6, wherein the incubator (13) is used for holding a volume of electrolyte solution (12) of 20-50L.
10. The rapid deterioration system of an extra-high and extra-high voltage arrester according to claim 6, characterized in that the electrolyte solution (12) in the incubator (13) is kept at a temperature of 80 ℃.
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| CN109298263B (en) * | 2018-10-22 | 2021-02-02 | 西安交通大学 | Lightning arrester valve block accelerated aging test device based on direct current coupling impact power supply |
| CN114441872B (en) * | 2022-01-14 | 2023-03-10 | 西南交通大学 | ZnO varistor aging state evaluation method based on temperature influence |
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| CN106680652A (en) * | 2017-01-20 | 2017-05-17 | 国网河南省电力公司电力科学研究院 | Metal oxide arrester electrification test experiment research system |
| CN206960567U (en) * | 2017-05-26 | 2018-02-02 | 国家电网公司 | One kind is super, ultra-high voltage lightning arrester rapid degradation system |
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| JP2005292107A (en) * | 2004-03-31 | 2005-10-20 | Takemitsu Higuchi | Deterioration diagnostic system based on resonance point and impedance extreme value point |
| CN102298108A (en) * | 2011-05-25 | 2011-12-28 | 重庆大学 | Impact characteristic simulation test apparatus of earthing device and method thereof |
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