CN104007310B - A kind of Leakage Current of Zinc-oxide Lightning Arresters detection method - Google Patents
A kind of Leakage Current of Zinc-oxide Lightning Arresters detection method Download PDFInfo
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- CN104007310B CN104007310B CN201410246891.9A CN201410246891A CN104007310B CN 104007310 B CN104007310 B CN 104007310B CN 201410246891 A CN201410246891 A CN 201410246891A CN 104007310 B CN104007310 B CN 104007310B
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- spark gap
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Abstract
A kind of Leakage Current of Zinc-oxide Lightning Arresters detection method, belongs to power equipment monitoring field, is specifically related to the technical scheme of a kind of detection method to leakage current of an arrester.It is characterized in that the method that the device that a kind of utilization is formed in parallel carries out leakage current of an arrester detection by standby spark gap and the sampling resistor branch that is made up of sampling resistor, ammeter, capacitor and electric fuse, have an advantage in that and be: install simple, low cost, applied widely, degree of accuracy is high, without using externally fed equipment, normal work to former spark gap has no adverse effect, achieve the standby functions of spark gap, when former spark gap cannot normally work, standby spark gap is started working, and in a disguised form extends the working life of spark gap.
Description
Technical field
One Leakage Current of Zinc-oxide Lightning Arresters detection method of the present invention, belongs to power equipment monitoring field, is specifically related to
A kind of technical scheme of the detection method to leakage current of an arrester.
Background technology
Due to the various advantages of electric energy, electric energy has been used the every aspect of life.Power system properly functioning is right
National economy plays an important role.Overvoltage protection, is the important way ensureing safe operation of power system.Spark gap, makees
For a kind of overvoltage protection equipment, i.e. it is possible to prevent switching overvoltage, is possible to prevent again lightning surge.In electrical network, as
A kind of overvoltage protection equipment, spark gap has been used electrical network various piece, such as transformator, high voltage transmission line, transformer station etc.
Ground.Nowadays, spark gap all uses gapless metal-oxide lighting arrester, owing to its long-term work is under power-frequency voltage,
And it is operated in outdoor more, and easily being affected by sleet hardships, the zinc oxide valve plate making spark gap is the moistest, aging, causes and keeps away
The rising of thunder device leakage current, the rising of leakage current, the increase of spark gap caloric value, the increasing of spark gap caloric value can be caused
Add, the aging quickening of spark gap can be caused again, ultimately result in spark gap due to overheated and damage, even explode time serious.As
If the aging conditions of spark gap can not be found in time, maintenance is with changing, and when thunderbolt occurs, the lightning function of spark gap is affected,
Large-area power-cuts will be caused, even jeopardize the life security of people.
Existing arrester on-line monitoring system, the leakage currents using current sensor detection spark gap, to reach more
Do not affect the effect of former spark gap circuit.But this mode capacity of resisting disturbance is weak, testing result inaccuracy.
Summary of the invention
One Leakage Current of Zinc-oxide Lightning Arresters detection method of the present invention, it is therefore intended that be to overcome existing spark gap leakage electricity
The deficiency of stream detection technique, open a kind of anti-interference, it is not necessary to use externally fed equipment, it is achieved the function of standby spark gap, inspection
Survey the technical scheme of result accurate leakage current of an arrester detection method.
One Leakage Current of Zinc-oxide Lightning Arresters detection method of the present invention, it is characterised in that be a kind of utilization by standby lightning-arrest
The device that device and the sampling resistor branch being made up of sampling resistor, ammeter, capacitor and electric fuse are formed in parallel is taken shelter from the thunder
The method of device leakage current detection, the concrete measured step of the method is as follows:
1) selecting the standby spark gap identical with former Zinc-Oxide Arrester model, the conventional, electric-resistance selecting resistance to be 1 is
Sampling resistor, selected range is the ammeter of 10mA, selects high voltage bearing capacitor, and selecting fusing value is the electric fuse of 2mA；
2) by sampling branch road in series to the sampling resistor selected by step 1), ammeter, capacitor and resistance wire；
3) again by step 2) the sampling standby spark gap selected with step 1) of branch road that constituted is in parallel, the composition present invention's
Leakage current table；
4) leakage current table step 3) constituted is serially connected on the earth lead of spark gap；Realize the leakage electricity of spark gap
Stream detection and the standby functions of spark gap；
5) according to principle and the characteristic of capacitor of parallel circuit, when spark gap normally works, leakage current all leads to
Cross step 2) the sampling branch road that constituted, the leakage current of spark gap measured by ammeter described in step 1), it is achieved that step 4) institute
State the function of leakage current of an arrester detection；
6) breakdown voltage of capacitor described in step 1) exceedes the threshold values of the standby spark gap selected by step 1), has served as electricity
When Hair Fixer is raw, the discharge current of spark gap flows through standby spark gap described in step 1), flows into the earth；
7) when spark gap reaches replacing condition, the electric current flowing through electric fuse described in step 1) reaches the fusing of electric fuse
Value, blown fuse, the standby spark gap described in step 1) is started working, it is achieved the standby functions of spark gap described in step 4).
One Leakage Current of Zinc-oxide Lightning Arresters detection method of the present invention, has an advantage in that and is: install simple, low cost,
Applied widely, degree of accuracy is high, it is not necessary to use externally fed equipment, and the normal work to former spark gap has no adverse effect, it is achieved
The standby functions of spark gap, when former spark gap cannot normally work, standby spark gap is started working, and in a disguised form extends lightning-arrest
The working life of device.
Accompanying drawing explanation
Fig. 1 is the scheme of installation of leakage current of an arrester detection method of the present invention.
Fig. 2 is the cut-away view of leakage current table of the present invention.
In Fig. 1: 1-high-pressure side；2-spark gap；3-leakage current table；4-earth terminal.
In Fig. 2: the standby spark gap of 1-；2-sampling resistor；3-ammeter；4-capacitor；5-electric fuse.
Detailed description of the invention
Below in conjunction with the accompanying drawings with the method step content of the present invention, further illustrate the inspection of leakage current of an arrester of the present invention
The architectural feature of survey method and feature thereof.
1) selecting the standby spark gap identical with former Zinc-Oxide Arrester model, the conventional, electric-resistance selecting resistance to be 1 is
Sampling resistor, selected range is the high sensitivity ammeter of 10mA, selects high voltage bearing capacitor, and selecting fusing value is 2mA's
Electric fuse；
2) by sampling branch road in series to the sampling resistor selected by step 1), ammeter, capacitor and resistance wire；
3) again by step 2) the sampling standby spark gap selected with step 1) of branch road that constituted is in parallel, the composition present invention's
Leakage current table；
4) leakage current table step 3) constituted is serially connected on the earth lead of spark gap；Owing to leakage current is special
Internal structure, former spark gap circuit is not resulted in impact, and achieves the leakage current detection of spark gap and spark gap
Standby functions；
5) according to " parallel shunt " principle and " logical high frequency, hinder low frequency " characteristic of capacitor of parallel circuit, spark gap is worked as
When normally working, the leakage current of spark gap is all by step 2) the sampling branch road that constituted, ammeter described in step 1) is surveyed
Go out the leakage current of spark gap, it is achieved that the function of leakage current of an arrester detection described in step 4)；
6) breakdown voltage of capacitor described in step 1) exceedes the threshold values of the standby spark gap selected by step 1), has served as electricity
When Hair Fixer is raw, standby spark gap has precedence over capacitor conducting, and the discharge current of spark gap flows through standby spark gap described in step 1),
Flow into the earth；
7) when spark gap reaches replacing condition, leakage current increases to 2mA, flows through the electric current of electric fuse described in step 1)
Reaching the fusing value of electric fuse, blown fuse, sampling branch road disconnects, and the standby spark gap described in step 1) is started working, with
The series connection of former spark gap forms new spark gap, it is achieved the standby functions of spark gap described in step 4).
Fig. 1 is the scheme of installation of the present invention.As it is shown in figure 1, ammeter of the present invention is serially connected in spark gap
In earth lead.
As a example by leakage current of an arrester detection under 220kV.
When spark gap normally works, leakage current is 1mA.When the leakage current of spark gap is more than 2mA, spark gap is necessary
In time with changing.
As in figure 2 it is shown, standby spark gap 1 is identical with former spark gap model, internal resistance is 220M.Sampling resistor 2 is resistance
Be the conventional, electric-resistance of 1, ammeter 3 be range be the common current table of 10mA, capacitor 4 is a high-voltage capacitance and to 50HZ
Alternating current hinder ability negligible, the blowout current of electric fuse 5 is 2mA.
When spark gap normally works, the leakage current of spark gap measured by the ammeter 3 within leakage current table.Spark gap
Leakage current by sampling branch road, capacitor 4 is equivalent to wire, and the blowout current of electric fuse 5 exceedes normally letting out of spark gap
Leakage current.Ammeter 3 demonstrates the size of current flowing through sampling resistor, and the electric current flowing through sampling resistor is the leakage of spark gap
Electric current.When having Lightning Over-voltage or switching overvoltage occurs, under this overvoltage, spark gap is in low resistive state, leakage electricity
The breakdown voltage of stream capacitor 4 within table is far above the threshold values of standby spark gap 1, and standby spark gap 1 is led prior to capacitor 4
Logical.Discharge current passes through spark gap and the standby spark gap 1 of leakage current table, flows into the earth.
When the leakage current of spark gap is more than 2mA, spark gap needs in time with changing.Electric fuse 5 within leakage current table
Fusing, sampling branch road disconnects.Standby spark gap 1 is connected with former spark gap, constitutes new spark gap.According to laboratory observation, profit
Detect leakage current of an arrester with this leakage current table, when former spark gap is aging need to change time, standby spark gap 1 and former spark gap
The new spark gap of composition can continue normally to work more than 1 year, significantly alleviates the urgent degree with changing spark gap.
The feature of leakage current of an arrester detection method of the present invention is the standby functions achieving spark gap.Utilize electricity in parallel
The shunting principle on road, the pressure-sensitive character of metal-oxide and the characteristic of capacitor itself, when spark gap normally works, little lets out
Leakage current flows through sampling branch road, it is achieved the detection of leakage current of an arrester；When lightning arrester discharge, big discharge current is by standby
With spark gap, do not affect the lightning function of former spark gap；When former spark gap reaches with the condition of changing, but staff is because some is former
Because of cannot with changing this spark gap time, standby spark gap is connected with former spark gap the new spark gap of formation, has continued to keep away normally
Thunder device function reaches more than 1 year.Avoid because former spark gap serious aging even explodes the loss caused.When staff is with changing
After former spark gap, reinstalling the electric fuse within leakage current table, leakage current table recovers the function of detection electric current.This
Bright used leakage current table internal resistance is less than 1, and the resistance of arrester ground line is not resulted in impact.Measurement result is accurate
Really, there is no error.
Above example, simplifies part data and calculating, it is therefore an objective to better illustrate technical scheme and function.
When the leakage current of an arrester being applied to other electric pressure detects, can be according to condition, suitable selection is closed
Suitable sampling resistor, capacitor, electric fuse is to reach optimum efficiency.
Claims (1)
1. a Leakage Current of Zinc-oxide Lightning Arresters detection method, it is characterised in that be a kind of utilization by standby spark gap with by adopting
The device of the sampling branch circuit parallel connection that sample resistance, ammeter, capacitor and electric fuse are constituted carries out leakage current of an arrester inspection
The method surveyed, the concrete measured step of the method is as follows:
1) selecting the standby spark gap identical with former Zinc-Oxide Arrester model, the conventional, electric-resistance selecting resistance to be 1 is sampling
Resistance, selected range is the ammeter of 10mA, selects high voltage bearing capacitor, and selecting fusing value is the electric fuse of 2mA；
2) by sampling branch road in series to the sampling resistor selected by step 1), ammeter, capacitor and electric fuse；
3) again by step 2) the sampling standby spark gap selected with step 1) of branch road that constituted is in parallel, the leakage of the composition present invention
Ammeter；
4) leakage current table step 3) constituted is serially connected on the earth lead of spark gap；Realize the leakage current inspection of spark gap
Survey and the standby functions of spark gap；
5) according to principle and the characteristic of capacitor of parallel circuit, when spark gap normally works, leakage current is all by step
Rapid 2) the sampling branch road constituted, the leakage current of spark gap measured by ammeter described in step 1), it is achieved that keep away described in step 4)
The function of thunder device leakage current detection；
6) breakdown voltage of capacitor described in step 1) exceedes the threshold value of the standby spark gap selected by step 1), when overvoltage is sent out
Time raw, the discharge current of spark gap flows through standby spark gap described in step 1), flows into the earth；
7) when spark gap reaches replacing condition, the electric current flowing through electric fuse described in step 1) reaches the fusing value of electric fuse, protects
Danger silk fusing, the standby spark gap described in step 1) is started working, it is achieved the standby functions of spark gap described in step 4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410246891.9A CN104007310B (en) | 2014-06-06 | 2014-06-06 | A kind of Leakage Current of Zinc-oxide Lightning Arresters detection method |
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| CN201410246891.9A CN104007310B (en) | 2014-06-06 | 2014-06-06 | A kind of Leakage Current of Zinc-oxide Lightning Arresters detection method |
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| CN104007310A CN104007310A (en) | 2014-08-27 |
| CN104007310B true CN104007310B (en) | 2016-08-17 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297617B (en) * | 2014-10-12 | 2017-07-07 | 胡智宏 | Lightning arrester leakance measurement sensor |
| CN107465178A (en) * | 2017-08-17 | 2017-12-12 | 国家电网公司 | Automatic fusing type direct current arrester group |
| CN115097168B (en) * | 2022-06-23 | 2023-10-31 | 国网湖北省电力有限公司宜昌供电公司 | Multifunctional wiring device for live test of lightning arrester |
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| WO2006062168A1 (en) * | 2004-12-10 | 2006-06-15 | Japan Ae Power Systems Corporation | Arrestor and method of measuring leakage current of arrestor |
| CN1991395A (en) * | 2005-12-29 | 2007-07-04 | 上海电气集团股份有限公司 | Method for monitoring resistant current in leakage current of an arrester |
| CN101944719A (en) * | 2010-08-20 | 2011-01-12 | 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 | Detection system and detection method of capacitance sleeve pipe and current transformer |
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2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2594803Y (en) * | 2002-12-11 | 2003-12-24 | 武汉恒安电气有限责任公司 | Extending board tray for testing electric circuit boards |
| WO2006062168A1 (en) * | 2004-12-10 | 2006-06-15 | Japan Ae Power Systems Corporation | Arrestor and method of measuring leakage current of arrestor |
| CN1991395A (en) * | 2005-12-29 | 2007-07-04 | 上海电气集团股份有限公司 | Method for monitoring resistant current in leakage current of an arrester |
| CN101944719A (en) * | 2010-08-20 | 2011-01-12 | 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 | Detection system and detection method of capacitance sleeve pipe and current transformer |
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