CN1584607A - Overvoltage on-line sampler for 6-35 KV electric power system - Google Patents
Overvoltage on-line sampler for 6-35 KV electric power system Download PDFInfo
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- CN1584607A CN1584607A CN 200410022675 CN200410022675A CN1584607A CN 1584607 A CN1584607 A CN 1584607A CN 200410022675 CN200410022675 CN 200410022675 CN 200410022675 A CN200410022675 A CN 200410022675A CN 1584607 A CN1584607 A CN 1584607A
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Abstract
An on-line sampling device consists of high voltage arm including high voltage capacity, buffer resistance and insulation outer protective sheath; and low voltage arm including low voltage capacity, protective gap, subvoltage output end and metal shielded outer sheath. It has response characteristic below 15-100 nanosecond and can catch overvoltage signal in transient state with sampling voltage of 3-35kv.
Description
Affiliated technical field
The present invention relates to relate to the Operation of Electric Systems on-Line Monitor Device, the object of monitoring is a superpotential.
Technical background
The voltage that the electrical equipment rated voltage appears surpassing in (because of thunderbolt or change the road) in the Operation of Electric Systems is called superpotential, can cause power outage by damage equipment during the emerged in operation superpotential.For preventing that the superpotential damage equipment is equipped with overvoltage protections such as lightning arrester.But in 6～35KV system a large amount of overvoltage protections such as lightning arrester have been installed, superpotential accident rate (high pressure device damage such as transformer or cause power outage) is still higher.Research for problem up to now just rests on theoretical and laboratory simulation research level, does not have the case correspondence of actual accidents wave process.This be since operational system do not have can be when superpotential occurs online (moving simultaneously) monitoring device of accident wave process under the real time record with system; the definite reason that is difficult to the accident of analyzing (is because superpotential amplitude or steepness surpass the ability to bear of equipment; perhaps the dielectric level of equipment reduces; still protective device has problem), prevention methods is proposed.
Electric system conventional online fault oscillograph adopts voltage transformer (VT) as sensor, because the time response of voltage transformer (VT) is longer, usually more than 20 milliseconds, and because by the electromagnetic induction voltage of transformation, the transient state waveform that obtains is lopsided, therefore only is applicable to the sampling to systematic steady state superpotential accident.And the Lightning Over-voltage breakdown accident wave process microsecond order of magnitude normally is 1.5/50 delicate as standard lightning surge ripple.The wave recording device of need nanosecond just can record superpotential accident wave process (nS) order of magnitude response time.Internal overvoltage accident wave process normally millisecond is finished in hundreds of milliseconds in a few tens of milliseconds as the switching overvoltage ripple usually to a second order of magnitude.Therefore high response characteristic of (nS) order of magnitude and wide band wave recording device just can record superpotential accident wave process also to need nanosecond.
The content of invention
The purpose of this invention is to provide a kind of 6～35KV Hyper-Voltage of Power Systems on-line sampling device.It is good that this device has response characteristic, can stablize on-line operation, catches 6～35KV Hyper-Voltage of Power Systems incident wave process automatically.For the crash analysis of Operation of Electric Systems superpotential provides technical support,, electrical equipment damages accumulation operating experience for preventing superpotential.
For realizing that the technical scheme that purpose of the present invention adopts is such: promptly a kind of 6～35KV Hyper-Voltage of Power Systems on-line sampling device, this apparatus structure comprises high-voltage arm and low-voltage arm, high-voltage arm comprises high-voltage capacitance, damping resistance and insulation oversheath, and low-voltage arm comprises low-voltage capacitance, low pressure damping resistance, protection gap, dividing potential drop output terminal and metallic shield housing; High-voltage arm and low-voltage arm series connection.
The technique effect that said apparatus can reach is significant: promptly it has following time resolution characteristics of 200 nanoseconds, can capture the overvoltage signal in the transient state process.Sampled voltage is 6～35 kilovolts, output voltage is in ± 40 volts, dielectric level is greater than 1.1～1.5 times of the working voltage grade equipment, the creepage distance of its insulation oversheath is greater than 2.1 centimetres/kilovolt, long-term on-line operation, spoilage is low under the ordinary accident state, can guarantee the stable sampling under the accident condition.
Description of drawings
Said structure of the present invention and work thereof can further specify by the embodiment that accompanying drawing provides.
Embodiment has following accompanying drawing:
Accompanying drawing 1 is an equivalent circuit theory logic diagram of the present invention;
Accompanying drawing 2 is the circuit theory of sensor of the present invention and section of structure;
Accompanying drawing 3 is used for the theory diagram of 6～35KV Hyper-Voltage of Power Systems on-line sampling system for the present invention.
Embodiment
Referring to accompanying drawing 1,2, high-voltage arm comprises high-voltage capacitance C1, damping resistance R1 and insulation oversheath 1 in an embodiment, and low-voltage arm comprises low-voltage capacitance C2, low pressure damping resistance R2, protection gap g, dividing potential drop output terminal cable joint pin J and metallic shield housing 2; The insulation oversheath of high-voltage arm is the silicon rubber oversheath, and its creepage distance is not less than 21mm/kv, and high-voltage arm insulation oversheath lower end and low-voltage arm shield shell upper end adopt insulation to be fastenedly connected; Low-voltage arm is by the coaxial parallel connection of several electric capacity, and the surface scribbles the coatings layer, is contained in the metallic shield shell, on the low-voltage capacitance of low-voltage arm, be parallel with the protection gap, be neon tube, when making the overvoltage of low-voltage arm electric capacity for some reason, the protection gap discharge plays a protective role; The dividing potential drop output terminal is by build-out resistor R3 stube cable joint pin J.
The intrinsic standoff ratio of the output terminal of said apparatus is got k=1500～2000 when the 10KV system, in the 35KV system constantly, k=5000～5500, output voltage signal is between 3.5～3 5 volts, and transmission antijamming capability strong, weak electricity equipment can bear again.The high-voltage arm capacitor C
1Be 200～300pF, serial connection damping resistance R in high-voltage arm
1Get 50～150 Europe, the low-voltage arm capacitor C
2Get 0.25～0.55uF, time constant is C
1R
1Less than 20～100ns, satisfy the requirement of operation and sampling.
Said apparatus when in use, online and all power equipment paired runnings of system are reduced to setting range (reducing by 1500～5500 times) with system's three phase-to-ground voltages, and deliver to front end circuit by the coaxial shielding cable.When the system working voltage occurred surpassing setting, front end circuit triggered superpotential wave process under the sample record automatically, and be preface with time, for event name is stored into the computing machine assigned address, give the alarm immediately.Managerial personnel can be in real time or are carried out online at random or the off-line analysis processing.For the superpotential crash analysis provides technical support.
Claims (3)
1, a kind of 6～35KV Hyper-Voltage of Power Systems on-line sampling device, this apparatus structure comprises high-voltage arm and low-voltage arm, high-voltage arm and low-voltage arm series connection, high-voltage arm comprises high-voltage capacitance (C1), damping resistance (R1) and silicon rubber insulation oversheath (1); Low-voltage arm comprises low-voltage capacitance (C2), low pressure damping resistance (R2), protection gap (g), dividing potential drop output terminal (J) and metallic shield housing (2).
2,6～35KV Hyper-Voltage of Power Systems on-line sampling device according to claim 1, it is characterized in that: the intrinsic standoff ratio of device is got k=1500～2000 when the 10KV system; When the 35KV system, k=5000～5500; Output voltage signal is between 3.5～35 volts; The high-voltage arm capacitor C
1Be 200～300pF, serial connection damping resistance R in high-voltage arm
1Get 50～150 Europe, the low-voltage arm capacitor C
2Get 0.25～0.55uF, time constant is C
1R
1Less than 20～100ns; High-voltage arm insulation oversheath creepage distance is not less than 21mm/kv.
3,6～35KV Hyper-Voltage of Power Systems on-line sampling device according to claim 1 is characterized in that: high-voltage arm insulation oversheath (1) lower end is connected by the insulation securing member with low-voltage arm shield shell (2) upper end; Low-voltage capacitance (C2) is by the coaxial parallel connection of several electric capacity, and the surface scribbles the coatings layer, is contained in the metallic shield housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100226752A CN100394201C (en) | 2004-05-31 | 2004-05-31 | Overvoltage on-line sampler for 6-35 KV electric power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100226752A CN100394201C (en) | 2004-05-31 | 2004-05-31 | Overvoltage on-line sampler for 6-35 KV electric power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1584607A true CN1584607A (en) | 2005-02-23 |
| CN100394201C CN100394201C (en) | 2008-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100226752A Expired - Fee Related CN100394201C (en) | 2004-05-31 | 2004-05-31 | Overvoltage on-line sampler for 6-35 KV electric power system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100356650C (en) * | 2005-08-26 | 2007-12-19 | 清华大学 | Intelligent data collecting and overvoltage protective system for high and medium voltage power device |
| CN100370267C (en) * | 2005-03-14 | 2008-02-20 | 西安交通大学 | On-line detecting method and its device for multiple path transient wave form over voltage of power system |
| CN100552458C (en) * | 2006-07-31 | 2009-10-21 | 深圳市计量质量检测研究院 | High-frequency high-pressure measurement mechanism |
| CN101893654A (en) * | 2010-06-25 | 2010-11-24 | 国网电力科学研究院 | Method and system for measuring transient overvoltage of high voltage power network through distribution capacitance method |
| CN101907653A (en) * | 2010-06-25 | 2010-12-08 | 中国电力科学研究院 | Signal acquisition and transmission device for high-voltage DC transmission converter valve |
| CN103066582A (en) * | 2012-12-12 | 2013-04-24 | 国网智能电网研究院 | Overvoltage protection method and overvoltage protection devices of modular multi-level converters |
| CN103344821A (en) * | 2013-06-25 | 2013-10-09 | 国家电网公司 | Transient overvoltage on-line monitoring system based on CVT and provided with built-in low-voltage capacitor |
| CN106597147A (en) * | 2016-11-24 | 2017-04-26 | 云南电网有限责任公司电力科学研究院 | State monitoring system and method of lightning arrester with series gap based on residual voltage monitoring |
| CN107024613A (en) * | 2016-08-31 | 2017-08-08 | 同济大学 | High-voltage feedback power cable square wave on-line overvoltage monitor |
| CN109581170A (en) * | 2018-12-06 | 2019-04-05 | 贵州电网有限责任公司 | A kind of high frequency response bandwidth Lightning Over-voltage on-line monitoring system |
| CN109725193A (en) * | 2019-02-25 | 2019-05-07 | 云南电网有限责任公司红河供电局 | It is a kind of for running the suspension type neutral point undervoltage detection means for doing anti-defect diagonsis |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000236623A (en) * | 1999-02-15 | 2000-08-29 | Sanyo Electric Co Ltd | Overvoltage-detecting device |
-
2004
- 2004-05-31 CN CNB2004100226752A patent/CN100394201C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370267C (en) * | 2005-03-14 | 2008-02-20 | 西安交通大学 | On-line detecting method and its device for multiple path transient wave form over voltage of power system |
| CN100356650C (en) * | 2005-08-26 | 2007-12-19 | 清华大学 | Intelligent data collecting and overvoltage protective system for high and medium voltage power device |
| CN100552458C (en) * | 2006-07-31 | 2009-10-21 | 深圳市计量质量检测研究院 | High-frequency high-pressure measurement mechanism |
| CN101893654A (en) * | 2010-06-25 | 2010-11-24 | 国网电力科学研究院 | Method and system for measuring transient overvoltage of high voltage power network through distribution capacitance method |
| CN101907653A (en) * | 2010-06-25 | 2010-12-08 | 中国电力科学研究院 | Signal acquisition and transmission device for high-voltage DC transmission converter valve |
| CN101907653B (en) * | 2010-06-25 | 2014-02-19 | 中国电力科学研究院 | Signal acquisition and transmission device for high-voltage DC transmission converter valve |
| CN103066582B (en) * | 2012-12-12 | 2015-11-04 | 国网智能电网研究院 | A kind of modularization multi-level converter method of overvoltage protection and protector thereof |
| CN103066582A (en) * | 2012-12-12 | 2013-04-24 | 国网智能电网研究院 | Overvoltage protection method and overvoltage protection devices of modular multi-level converters |
| CN103344821A (en) * | 2013-06-25 | 2013-10-09 | 国家电网公司 | Transient overvoltage on-line monitoring system based on CVT and provided with built-in low-voltage capacitor |
| CN107024613A (en) * | 2016-08-31 | 2017-08-08 | 同济大学 | High-voltage feedback power cable square wave on-line overvoltage monitor |
| CN106597147A (en) * | 2016-11-24 | 2017-04-26 | 云南电网有限责任公司电力科学研究院 | State monitoring system and method of lightning arrester with series gap based on residual voltage monitoring |
| CN109581170A (en) * | 2018-12-06 | 2019-04-05 | 贵州电网有限责任公司 | A kind of high frequency response bandwidth Lightning Over-voltage on-line monitoring system |
| CN109725193A (en) * | 2019-02-25 | 2019-05-07 | 云南电网有限责任公司红河供电局 | It is a kind of for running the suspension type neutral point undervoltage detection means for doing anti-defect diagonsis |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100394201C (en) | 2008-06-11 |
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