CN107860986A - A kind of Zinc-Oxide Arrester aging assessment - Google Patents
A kind of Zinc-Oxide Arrester aging assessment Download PDFInfo
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- CN107860986A CN107860986A CN201710859300.9A CN201710859300A CN107860986A CN 107860986 A CN107860986 A CN 107860986A CN 201710859300 A CN201710859300 A CN 201710859300A CN 107860986 A CN107860986 A CN 107860986A
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- zinc
- current
- oxide arrester
- arrester
- aging
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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
- G01R31/003—Environmental or reliability tests
Abstract
The present invention relates to a kind of Zinc-Oxide Arrester aging assessment, this method includes：(1) PC being connected including the ac high-voltage experiment power supply being applied on Zinc-Oxide Arrester, the RC divider being connected in experimental loop, the high-speed data acquisition card on the ground lead of loop with high-speed data acquisition card is built；(2) apply alternating voltage between the high pressure of Zinc-Oxide Arrester and ground terminal, arrester is operated in normal operating condition, leakage current is gathered on ground lead；(3) according to the phase relation between leakage current and applied alternating voltage, current in resistance property is isolated；(4) current in resistance property and circuital average value are calculated on PC, the ratio A calculated between current in resistance property and total current is evaluated.The present invention provides reference frame for work such as the repair and maintenances of Zinc-Oxide Arrester, has intuitively directive significance.
Description
Technical field
The invention belongs to the assessment technology field of ZnO arrester, particularly a kind of Zinc-Oxide Arrester aging assessment.
Background technology
Its excellent non-linear U-I characteristic of Zinc-Oxide Arrester, key is served in power network overvoltage protection work
Effect.Zinc-Oxide Arrester has dominated the main status of current overvoltage protection, therefore grasps Zinc-Oxide Arrester characteristic very
Important, Zinc-Oxide Arrester has under normal system operating voltage, and high resistance state is presented, and only microampere order electric current passes through.
Low resistance is just presented in it under the effect of overvoltage high current, so as to limit the super excellent characteristic of the residual voltage at arrester both ends.ZnO grows
Phase on-line operation, influenceed by factors such as Operation of Electric Systems voltage, lightning surge, switching overvoltage and extraneous use environments
Aging phenomenon can gradually occur, finally lose protective effect, or even cause short circuit grounding failure, cause power system power failure thing
Therefore.Alternating current experiment, discharge counter motion detection under conventional insulation resistance test, leakage current test, working voltage
Etc. test event, with the progress in epoch and the demand of power network development can not meet real-time monitoring to ZnO ageing states and
Assess, it is therefore necessary to seek a kind of new test method and assessment system scientifically to detect and assess the old of Zinc-Oxide Arrester
Change situation, and then rationally scientifically carry out the operation and maintenance of Zinc-Oxide Arrester.Therefore, ZnO aging conditions are carried out online
Monitoring, understands its aging conditions for safeguarding safe operation of power system important role in time.
The content of the invention
The purpose of the present invention is in view of the shortcomings of the prior art, and to propose a kind of Zinc-Oxide Arrester aging assessment.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of Zinc-Oxide Arrester aging assessment, it is as follows that the method comprising the steps of：
(1) Zinc-Oxide Arrester Aging Assessment system is built, the system includes the exchange being applied on Zinc-Oxide Arrester
High-voltage test electric power, the RC divider being connected in experimental loop, the high-speed data acquisition on the ground lead of loop
Card, the PC being connected with high-speed data acquisition card；
(2) apply alternating voltage between the high pressure of Zinc-Oxide Arrester and ground terminal, arrester is operated in normal fortune
Row state, gathers leakage current on ground lead；
(3) according to the phase relation between leakage current and applied alternating voltage, current in resistance property is isolated；
(4) current in resistance property and circuital average value are calculated on PC, calculates current in resistance property and total current
Between ratio A, when A values than dispatch from the factory when standard value A0When increasing 20%-30%, Zinc-Oxide Arrester is in available critical
State, when A values are than standard value A when dispatching from the factory0When increasing 30%-50%, illustrate that aging seriously needs repairing or changed, when A values
Standard value A during than dispatching from the factory0, it is necessary to change immediately during increase more than 50%.
Moreover, the high-speed data acquisition card described in Aging Assessment system is further connected with high-speed figure storage oscillography
Device, carries out current in resistance property shunting using high-speed figure storage oscillograph and total current is shown, more intuitively reacts zinc oxide and keeps away
The degree of aging of thunder device.
The advantages and positive effects of the present invention are：
The present invention is directed to the operation principle and concrete structure of Zinc-Oxide Arrester, devises arrester resistance current and supervises online
Survey and Aging Assessment test system, by applying alternating voltage between the high pressure of arrester, ground terminal, are operated in arrester
Normal operating condition, leakage current is gathered on ground lead, closed according to the phase between leakage current and applied alternating voltage
System, separate current in resistance property.LabView is used as platform, builds zinc oxide lightning arrester block property current detection and Aging Assessment platform,
Realize that Aging Assessment, total current are shown, current in resistance property shunts, current in resistance property maximum is shown and the function such as data storage, so as to
The work such as the repair and maintenance for Zinc-Oxide Arrester provide reference frame, have intuitively directive significance.
Embodiment
The embodiment of the present invention is further described below：It is emphasized that embodiment of the present invention is explanation
Property, rather than it is limited, therefore the present invention is not limited to the embodiment described in embodiment, it is every by this area
The other embodiment that technical staff's technique according to the invention scheme is drawn, also belongs to the scope of protection of the invention.
Principle analysis
ZnO arrester is made of good non-linear voltage-current characteristics based on its valve block, and it can during overvoltage
Good over-voltage, but in normal operation, its state of insulation just becomes particularly significant, and the leakage current of arrester can
Reflect its state of insulation, the circuit counting model of arrester is composed in parallel by capacitive part and non linear metal oxide capacitance, kept away
The full leakage current of thunder device is divided into two parts：Capacitive part and resistive portion, wherein capacitive part occupy an leading position,
Resistive portion is smaller under normal circumstances, only accounts for the 5-20% of full leakage current, and still have no basis to prove at present：With
The decline of the voltage-current characteristic of non linear metal oxide capacitance, its capacity current have significant change；Therefore, capacity current
Measurement can not reliably show the situation of arrester；I.e.：When arrester state changes, the capacitive in its leakage current
Part is relatively stable, without there is big change therewith, and the change of current in resistance property is fairly obvious, therefore can pass through survey
Current in resistance property is measured to analyze the state of insulation of arrester.
A kind of Zinc-Oxide Arrester aging assessment, it is as follows that the method comprising the steps of：
(1) Zinc-Oxide Arrester Aging Assessment system is built, the system includes the exchange being applied on Zinc-Oxide Arrester
High-voltage test electric power, the RC divider being connected in experimental loop, the high-speed data acquisition on the ground lead of loop
Card, the high-speed figure storage oscillograph and PC being connected with high-speed data acquisition card；
(2) apply alternating voltage between the high pressure of Zinc-Oxide Arrester and ground terminal, arrester is operated in normal fortune
Row state, gathers leakage current on ground lead；
(3) according to the phase relation between leakage current and applied alternating voltage, current in resistance property is isolated；
(4) carry out current in resistance property shunting in high-speed figure storage oscillograph and total current is shown, intuitively react zinc oxide
The degree of aging of arrester；
(5) current in resistance property and circuital average value are calculated on PC, calculates current in resistance property and total current
Between ratio A, when A values than dispatch from the factory when standard value A0When increasing 20%-30%, Zinc-Oxide Arrester is in available critical
State, when A values are than standard value A when dispatching from the factory0When increasing 30%-50%, illustrate that aging seriously needs repairing or changed, when A values
Standard value A during than dispatching from the factory0, it is necessary to change immediately during increase more than 50%.
Claims (2)
1. a kind of Zinc-Oxide Arrester aging assessment, it is characterised in that it is as follows that the method comprising the steps of：
(1) Zinc-Oxide Arrester Aging Assessment system is built, the system includes the ac high-voltage being applied on Zinc-Oxide Arrester
Experiment power supply, the RC divider being connected in experimental loop, the high-speed data acquisition card on the ground lead of loop, with
The PC of high-speed data acquisition card connection；
(2) apply alternating voltage between the high pressure of Zinc-Oxide Arrester and ground terminal, arrester is operated in normal operation shape
State, leakage current is gathered on ground lead；
(3) according to the phase relation between leakage current and applied alternating voltage, current in resistance property is isolated；
(4) current in resistance property and circuital average value are calculated on PC, is calculated between current in resistance property and total current
Ratio A, when A values than dispatch from the factory when standard value A0When increasing 20%-30%, Zinc-Oxide Arrester is in available critical shape
State, when A values are than standard value A when dispatching from the factory0When increasing 30%-50%, illustrate that aging seriously needs repairing or changed, when A values ratio
Standard value A when dispatching from the factory0, it is necessary to change immediately during increase more than 50%.
2. Zinc-Oxide Arrester aging assessment according to claim 1, it is characterised in that：In Aging Assessment system
The high-speed data acquisition card is further connected with high-speed figure storage oscillograph, is hindered using high-speed figure storage oscillograph
Property current distributing and total current show, intuitively react Zinc-Oxide Arrester degree of aging.
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| CN201710859300.9A CN107860986A (en) | 2017-09-21 | 2017-09-21 | A kind of Zinc-Oxide Arrester aging assessment |
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| CN201710859300.9A CN107860986A (en) | 2017-09-21 | 2017-09-21 | A kind of Zinc-Oxide Arrester aging assessment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109342843A (en) * | 2018-09-18 | 2019-02-15 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of Zinc-Oxide Arrester aging determination method based on nonlinear factor |
| CN112255484A (en) * | 2020-10-19 | 2021-01-22 | 国网河南省电力公司电力科学研究院 | Lightning arrester operation state online monitoring and assessment method and system |
| CN112904117A (en) * | 2021-01-20 | 2021-06-04 | 云南电网有限责任公司电力科学研究院 | Lightning arrester aging test evaluation system and method considering air temperature and multiple lightning strikes |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109342843A (en) * | 2018-09-18 | 2019-02-15 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of Zinc-Oxide Arrester aging determination method based on nonlinear factor |
| CN112255484A (en) * | 2020-10-19 | 2021-01-22 | 国网河南省电力公司电力科学研究院 | Lightning arrester operation state online monitoring and assessment method and system |
| CN112255484B (en) * | 2020-10-19 | 2022-03-25 | 国网河南省电力公司电力科学研究院 | Lightning arrester operation state online monitoring and assessment method and system |
| CN112904117A (en) * | 2021-01-20 | 2021-06-04 | 云南电网有限责任公司电力科学研究院 | Lightning arrester aging test evaluation system and method considering air temperature and multiple lightning strikes |
| CN112904117B (en) * | 2021-01-20 | 2022-04-05 | 云南电网有限责任公司电力科学研究院 | Lightning arrester aging test evaluation system and method considering air temperature and multiple lightning strikes |
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Application publication date: 20180330 |