CN101430349B - Novel method for measuring resistive current of gapless metal-oxide lighting arrester - Google Patents
Novel method for measuring resistive current of gapless metal-oxide lighting arrester Download PDFInfo
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- CN101430349B CN101430349B CN 200810229445 CN200810229445A CN101430349B CN 101430349 B CN101430349 B CN 101430349B CN 200810229445 CN200810229445 CN 200810229445 CN 200810229445 A CN200810229445 A CN 200810229445A CN 101430349 B CN101430349 B CN 101430349B
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- gapless metal
- lighting arrester
- oxide lighting
- current
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- 229910044991 metal oxide Inorganic materials 0.000 title claims abstract description 24
- 150000004706 metal oxides Chemical class 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000523 sample Substances 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 238000012937 correction Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 abstract 1
- 230000006698 induction Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention relates to a method for detecting the resistive current of a gapless metal oxide arrester without the need of taking a PT (CVT) signal. The method is characterized in that a high-voltage electrified body of the gapless metal oxide arrester on the operation site is considered as an upper electrode of a high voltage arm of a capacitive divider, and a moving probe which can be arranged at will is considered as a lower electrode of the high voltage arm; the moving probe and an amplifier are connected by a cable, and a low voltage arm and an amplification circuit of the capacitive divider are arranged in the amplifier; the induction voltage Ug and a B phasing current Ib are obtained from the operation site and the included angle Phi between Ib and Ug can be measured; the virtual Ub can be obtained through Phi B is equal to Phi b minus Phi bg; and the virtual Ua and Uc can be made according to the 120-degree difference of a three-phase voltage in a system, thereby the measurement of the resistive current of a three-phase MOA is finished. The invention aims at solving the problem how to measure the resistive current of the MOA under three situations.
Description
One, technical field:
The present invention relates to a kind of method that PT (CVT) signal can detect resistive current of gapless metal-oxide lighting arrester again of not getting.
Two, background technology:
Measure the gapless metal-oxide lighting arrester in service current in resistance property of (being called for short MOA) with RCD-4 type current in resistance property measuring instrument; Not only to get the total current of tested phase MOA; Also to get the voltage of tested phase; This voltage is generally obtained from PT (electromagnetic potential transformer) or CVT (capacitance type potential transformer), and this is the method that people generally acknowledge.Yet following three kinds of situation, MOA (having from electric pressures such as 500kV, 330kV, 220kV, 110kV) all is equipped with at first kind of pole line and cable connection place, and the installation place no-voltage mutual inductor (PT or CVT) of MOA can't be got the comparative voltage signal; The MOA place that second kind of situation is many GIS does not have voltage transformer (VT) yet; The third situation is not installed PT yet in the electric substation of 220kV, 110kV.Operating MOA can receive various superpotential effects; Also receive the effect of the normal working voltage of electric system for a long time, the sealing of some MOA possibly lost efficacy, more than three kinds of reasons all can make the performance degradation of MOA; One of outstanding feature of deterioration, the current in resistance property that flows through MOA exactly increases.Along with power system development, more than the MOA of three kinds of situation also more and more, these MOA current in resistance property need to measure equally., must find when not getting PT (CVT) signal for this reason, measure the approach of the current in resistance property of MOA.
Three, summary of the invention:
1, goal of the invention: the present invention provides a kind of new method that PT (CVT) signal can detect resistive current of gapless metal-oxide lighting arrester again of not getting, and its purpose is to solve the existing problem of current in resistance property this respect how to measure MOA under three kinds of situation above-mentioned.
2, technical scheme: the present invention realizes through following technical scheme:
A kind of new method of measuring resistive current of gapless metal-oxide lighting arrester; It is characterized in that: the top electrode of regarding the high-voltage charged body of the on-the-spot gapless metal-oxide lighting arrester of operation as the capacitive divider high-voltage arm; With the bottom electrode of the movable probe that can arbitrarily place as high-voltage arm; Be connected movable probe with an amplifier with cable, the low-voltage arm and the amplifying circuit of capacitive divider arranged in the amplifier, get an induced voltage U from moving the scene
g, when system is stable, on-the-spot no strong wind, no heavy rain, then U
gBe stable, the induced voltage signal that has been exaggerated is delivered in the instrument and is measured;
Get B phase gapless metal-oxide lighting arrester electric current I
b, can measure I
bWith U
gAngle
Described high-voltage charged body comprises gapless metal-oxide lighting arrester, electromagnetic potential transformer and high-voltage connection.
Described
value is near 80 degree, or is measured value.
Employing alternating current 220V power supply replaces the voltage signal of electromagnetic potential transformer or capacitance type potential transformer, measures the resistive current first harmonics value of gapless metal-oxide lighting arrester.
3, advantage and effect: measure the current in resistance property of three-phase MOA in service through get induced voltage signal or 220v power supply signal from the scene; Make at no PT and not only do not have PT but also do not have under the occasion of 220v power supply; Can successfully carry out the surveying work of the current in resistance property of MOA in service; Whether the sealing that MOA is detected in the capital effectively lost efficacy, and its safe meaning is very great, obvious social benefit.
Four, description of drawings:
Fig. 1 is a probe amplifier annexation synoptic diagram of the present invention;
Fig. 2 is a current/voltage polar plot of the present invention.
Five, embodiment:
The present invention is on the basis with the former measuring principle of RCD-4 type current in resistance property measuring instrument, adopts the current in resistance property that probe method-induced electricity platen press can correct measurement three-phase MOA in service.Make not only not having PT but also do not have under the occasion of 220v power supply, can successfully carry out the surveying work of the current in resistance property of MOA in service.
Accompanying drawing 1 is the probe amplifier shop drawing; 1 is movable probe among Fig. 1, and 2 is amplifying circuit, and 3 is low-voltage arm, and 4 is instrument, and 5 is high-voltage charged body.Accompanying drawing 2 current/voltage polar plots; Among Fig. 2: U
gBe induced voltage; U
bVoltage for B phase MOA; I
a, I
b, I
cFirst-harmonic for three-phase MOA total current; Φ
bBe the angle between B phase voltage and the B phase current; Φ
BAngle for induced voltage and B phase current; Φ
BgAngle for induced voltage and B phase voltage.
Get an induced voltage from moving the scene; The top electrode of (comprising MOA, PT and high-voltage connection) regarding the on-the-spot high-voltage charged body of operation as the capacitive divider high-voltage arm; The special movable probe that can arbitrarily place is connected movable probe with cable as the bottom electrode of high-voltage arm with a special-purpose amplifier, the low-voltage arm and the amplifying circuit of capacitive divider arranged in the amplifier; The induced voltage signal that has been exaggerated is delivered to instrument, shown in the accompanying drawing 1.
Induced voltage U in the accompanying drawing 1
gDo not represent any phase voltage, because movable probe is arbitrarily to place U
gThe sensing of vector also maybe be always different, the U in the accompanying drawing 2
gBe to draw arbitrarily.When system is stable, on-the-spot no strong wind, no heavy rain, then U
gBe stable.
Get B phase MOA electric current I
b, can measure I
bWith U
gAngle
The method can solve the current in resistance property of circuit MOA and measure.
Another kind method is an alternating current 220V power supply method, and making at no PT has under the occasion of alternating current 220V power supply, can successfully carry out the surveying work of the current in resistance property of MOA in service.Concrete grammar is to replace PT (CVT) voltage signal with the alternating current 220V power supply, measures the resistive current first harmonics value of MOA.Its test philosophy is identical with probe method, has just replaced the voltage signal of PT with the alternating current 220V power supply.
Claims (4)
1. new method of measuring resistive current of gapless metal-oxide lighting arrester; It is characterized in that: the top electrode of regarding the high-voltage charged body (5) of the on-the-spot gapless metal-oxide lighting arrester of operation as the capacitive divider high-voltage arm; With the bottom electrode of the movable probe that can arbitrarily place (1) as high-voltage arm; Be connected movable probe (1) with an amplifier with cable, the low-voltage arm (3) and the amplifying circuit (2) of capacitive divider arranged in the amplifier, get an induced voltage U from moving the scene
g, when system is stable, on-the-spot no strong wind, no heavy rain, then U
gBe stable, the induced voltage signal that has been exaggerated is delivered in the instrument (4) and to be measured;
Get B phase gapless metal-oxide lighting arrester electric current I
b, can measure I
bWith U
gAngle
2. the new method of measurement resistive current of gapless metal-oxide lighting arrester according to claim 1 is characterized in that: described high-voltage charged body comprises gapless metal-oxide lighting arrester, electromagnetic potential transformer and high-voltage connection.
3. the new method of measurement resistive current of gapless metal-oxide lighting arrester according to claim 1 is characterized in that: described
value is a measured value.
4. the new method of measurement resistive current of gapless metal-oxide lighting arrester according to claim 2; It is characterized in that: employing alternating current 220V power supply replaces the voltage signal of electromagnetic potential transformer, measures the resistive current first harmonics value of gapless metal-oxide lighting arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810229445 CN101430349B (en) | 2008-12-09 | 2008-12-09 | Novel method for measuring resistive current of gapless metal-oxide lighting arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810229445 CN101430349B (en) | 2008-12-09 | 2008-12-09 | Novel method for measuring resistive current of gapless metal-oxide lighting arrester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101430349A CN101430349A (en) | 2009-05-13 |
| CN101430349B true CN101430349B (en) | 2012-04-18 |
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ID=40645862
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|---|---|---|---|
| CN 200810229445 Active CN101430349B (en) | 2008-12-09 | 2008-12-09 | Novel method for measuring resistive current of gapless metal-oxide lighting arrester |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621457B (en) * | 2012-03-13 | 2013-12-25 | 国家电网公司 | On-line detection method of metal oxide arrester insulating property influencing factor |
| CN102608392A (en) * | 2012-03-22 | 2012-07-25 | 上海市电力公司 | MOA (metal oxide arrester) resistive current detection system |
| CN102830319B (en) * | 2012-09-18 | 2016-02-24 | 辽宁省电力有限公司电力科学研究院 | A kind of zinc oxide lightning arrester insulation state measuring device with electricity and method |
| CN103245896B (en) * | 2013-04-24 | 2016-09-07 | 广州供电局有限公司 | Distribution line thunder and lightning induction voltage analog platform based on rocket triggered lightning technology |
| CN104122490A (en) * | 2014-07-16 | 2014-10-29 | 国家电网公司 | Transformer bushing insulation state online monitoring device and method |
| CN108957097B (en) * | 2015-05-19 | 2020-10-09 | 江苏理工学院 | Method for measuring resistive current fundamental wave of metal oxide arrester |
| CN104865438A (en) * | 2015-06-15 | 2015-08-26 | 江苏理工学院 | Method for measuring resistive current fundamental wave of zinc oxide arrester |
| CN106483360B (en) * | 2015-08-26 | 2019-03-12 | 国网河南省电力公司检修公司 | Utilize the method for 220V power supply on-line monitoring MOA current in resistance property |
| CN106597148A (en) * | 2016-11-24 | 2017-04-26 | 云南电网有限责任公司电力科学研究院 | Residual voltage monitoring based state monitoring system and method for lightning arrester without serial gap |
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| CN101430349A (en) | 2009-05-13 |
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Owner name: LIAONING DONGKE ELECTRIC POWER CO., LTD. LIAONING Free format text: FORMER OWNER: LIAONING DONGKE ELECTRIC POWER CO., LTD. LIAONING ELECTRIC POWER TESTING TECHNOLOGY CO., LTD. Effective date: 20121025 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20121025 Address after: Heping District, Siping City of Shenyang province Liaoning 110006 Street No. 39 Patentee after: Northeast Electric Power Research Institute Co., Ltd. Patentee after: Liaoning Dongke Power Co., Ltd. Patentee after: Liaoning Electric Power Testing Technology Co., Ltd. Patentee after: Liaoning Electric Power Co., Ltd.Electric Power Science Research Institute Patentee after: State Grid Corporation of China Address before: Heping District, Siping City of Shenyang province Liaoning 110006 Street No. 39 Patentee before: Northeast Electric Power Research Institute Co., Ltd. Patentee before: Liaoning Dongke Power Co., Ltd. Patentee before: Liaoning Electric Power Testing Technology Co., Ltd. |