CN102539888A - Direct measurement capacitance-current primary voltage sensor - Google Patents
Direct measurement capacitance-current primary voltage sensor Download PDFInfo
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- CN102539888A CN102539888A CN2012100144899A CN201210014489A CN102539888A CN 102539888 A CN102539888 A CN 102539888A CN 2012100144899 A CN2012100144899 A CN 2012100144899A CN 201210014489 A CN201210014489 A CN 201210014489A CN 102539888 A CN102539888 A CN 102539888A
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Abstract
The invention discloses a direct measurement capacitance-current primary voltage sensor which is formed in a mode that a capacitor is connected in series with the input end of a current-to-voltage converter. The input end of a current-to-voltage operational amplifier is connected in parallel with a TVS (Transient Voltage Suppressor) tube to be used as the input end of the current-to-voltage converter. The output voltage end of the operational amplifier is used as the output end of the direct measurement capacitance-current primary voltage sensor. When the direct measurement capacitance-current primary voltage sensor is firmly connected between a power grid phase voltage and the ground and the output voltage end of the direct measurement capacitance-current primary voltage sensor is connected with an acquisition device, optical fiber communication equipment and a merging unit, electronic voltage transformers in a power system, of which various voltage classes meet the IEC60044-7 standard, can be manufactured. The direct measurement capacitance-current primary voltage sensor disclosed by the invention has the characteristics of simple structure, low cost, strong anti-interference capability, good transient performance, high measurement precision, elimination of ferromagnetic resonance, no lead voltage drop and safety, stability and reliability for working.
Description
Technical field
The present invention relates to a kind of electronic type voltage transformer, especially relate to a kind of straight survey capacitance current type primary voltage sensor that is used for the various electric pressure voltage measurements of electric system.
Background technology
The primary voltage sensor of existing electronic type voltage transformer mainly is electromagnetic type and electric capacity or electric resistance partial pressure type sensor.Also occur comparatively advanced optics (OVT) primary voltage sensor in recent years both at home and abroad, also had patent and reported in literature electric capacity or resistance serial connection air core coil and electric capacity or resistance serial connection small current mutual inductor TA to constitute the electronic type voltage transformer of primary voltage sensor.
Ferroresonance possibly take place in electromagnetic-type electronic formula voltage transformer (VT) complex structure, large body and heavy mass, cost height, and is low to the small-signal measuring accuracy.
The sensing principle of electric capacity or electric resistance partial pressure type primary voltage sensor is based on electric capacity or electric resistance partial pressure principle, and tested high pressure directly is added on high-voltage arm electric capacity or the resistance, on low-voltage arm, tells the small voltage that is directly proportional with a sub-high pressure.The defective of this electric capacity or electric resistance partial pressure type primary voltage sensor is that capacitor and low-voltage lead exist stray capacitance; Intrinsic standoff ratio can be up to tens thousand of to hundreds thousand of times with the electric pressure difference; At a low pressure end transmission young waiter in a wineshop or an inn time voltage signal, load capacity is limited, has the lead-in wire pressure drop; Influence sensor accuracy, and be subject to external interference; The parallelly connected existence delay with high resistant of big electric capacity electric charge has increased transient error, and electric capacity is parallelly connected with small resistor greatly makes parameter designing and device choose complicacy and influence the precision of primary transducer.
The primary voltage sensor that electric capacity or resistance are connected with air core coil or little TA and constituted all possibly cause steady-state error and transient error at capacitor loops tandem electric inductance and TA secondary impedance.
Optics primary voltage sensor is a physical influence of utilizing optical material, carries out voltage measurement like bubble Ke Ersi (Pockels) effect, electric light Ke Er (Kerr) effect and inverse piezoelectric effect etc.But because optical material receives the influence of factors such as temperature and mechanical vibration bigger, stability is not high with reliability, and costs an arm and a leg, and many key issues such as phase angle measurement wait solution in addition.
Summary of the invention
For solving the technical matters that above-mentioned electronic type voltage transformer exists; The present invention provide a kind of simple in structure, volume is little, antijamming capability is strong, measuring accuracy is high, transient characterisitics are good, the straight survey capacitance current type primary voltage sensor of no ferroresonance, can be used to manufacture the electronic type voltage transformer of each electric pressure of electrical network.
The technical scheme that the present invention solves the problems of the technologies described above is: after capacitor series electrorheological electric pressure converter, between firm access electrical network phase voltage and the earth, promptly constituted single-phase straight survey capacitance current type primary voltage sensor.The so-called straight capacitance current of surveying is to adopt the electrorheological voltage operational amplifier to be connected in series into capacitor loops, directly measures capacitance current and it is become the voltage signal of linear change with it.
The capacitor of above-mentioned straight survey capacitance current type primary voltage sensor adopts a plurality of capacitors in series of positive temperature coefficient (PTC) and negative temperature coefficient close in value capacity half and half to form, or the adding temperature sensor carries out temperature compensation.
Above-mentioned electrorheological electric pressure converter is by the electrorheological voltage operational amplifier and connect the input end of TVS pipe (transient voltage inhibition diode) as the electrorheological electric pressure converter, and the output terminal of operational amplifier is as the straight output voltage terminal of surveying capacitance current type primary voltage sensor.
The input end of above-mentioned electrorheological electric pressure converter is firm to be serially connected between phase voltage and the capacitor top, gives the power supply of electrorheological voltage operational amplifier by the high-pressure side power supply, constitutes the straight capacitance current type high-pressure side once voltage sensor of surveying.
Above-mentioned electrorheological electric pressure converter input end is firm to be serially connected between capacitor end and the earth, gives the power supply of electrorheological voltage operational amplifier by the low pressure end power supply, constitutes the straight capacitance current type low pressure end primary voltage sensor of surveying.
Technique effect of the present invention:
1) the straight survey capacitance current type primary voltage sensor of each electric pressure; Choose suitable capacitor; Making the rated capacity electric current is about ten milliamperes; Directly insert the electrorheological voltage operational amplifier; Because minimum zero Europe that is approximately of the input resistance of operational amplifier, eliminated the compound numerical value sum of errors phase angle error increase of the primary voltage sensor that series connection air core coil or small current mutual inductor equivalence cause to the equivalent inductance of capacitor loop and equivalent resistance and error own, thereby improved the measuring accuracy of straight survey capacitance current type primary voltage sensor.
2) capacitance partial pressure type primary voltage sensor adopts little electric capacity and big capacitances in series to obtain minimum second divided voltage value by tap; Intrinsic standoff ratio can be up to tens thousand of to hundreds thousand of times with the electric pressure difference; And each electric pressure capacitance current of directly surveying capacitance current type primary voltage sensor is about ten milliamperes, and capacitor does not have the tap extension line, and capacitor evenly distributes; Thereby reduced the influence of stray capacitance, also greatly reduced the cost of capacitor measuring accuracy.
3) electric capacity or the utilization of electric resistance partial pressure type primary voltage sensor lead-in wire is given collector at low pressure end transmission voltage signal; There is the lead-in wire pressure drop, and is subject to external interference, and directly survey capacitance current type primary voltage sensor transmissions current signal; There is not the lead-in wire pressure drop, good in anti-interference performance;
4) because straight survey capacitance current type primary voltage sensor is not detained the influence of electric charge,, or in the reclosing process, has good transient performance when capacitor and power supply disconnection or primary voltage short circuit.
5) capacitor adopts a plurality of capacitors of positive temperature coefficient (PTC) and negative temperature coefficient close in value capacity half and half to be in series, or adopts temperature sensor to carry out temperature compensation.
6) simple in structure, volume is little, in light weight, cost is low, security good.Do not consume meritorious, but compensating reactive power, the secondary output short-circuit can not damage mutual inductor, and short circuit can fast quick-recovery output voltage after eliminating.
Below in conjunction with accompanying drawing and specific embodiment the present invention is further described.
Description of drawings
Fig. 1 directly surveys the structure principle chart of capacitance current type primary voltage sensor for high-pressure side of the present invention.
Fig. 2 directly surveys the structure principle chart of capacitance current type primary voltage sensor for low pressure end of the present invention.
Fig. 3 is the example structure figure of electrorheological electric pressure converter among the present invention.
Embodiment
Referring to Fig. 1, Fig. 3, be used for the straight survey capacitance current type primary voltage sensor of high pressure, UHV (ultra-high voltage) and extra-high voltage electronic type voltage transformer, 1 is high-voltage terminal; Directly be connected on the high voltage bus; 2 is the electrorheological electric pressure converter, and 3 is high-voltage capacitor, and 4 is the earth.The electrorheological electric pressure converter is made up of electrorheological voltage operational amplifier shown in Figure 3 and TVS pipe; Minimum zero Europe that is approximately of the input impedance of operational amplifier; Its input end and parallelly connected firm again being serially connected between phase voltage and the capacitor of TVS pipe, TVS has managed the effect of protection operational amplifier.
In the foregoing description, the connecting line of the wiring of electrorheological electric pressure converter and busbar voltage and capacitor and capacitor and the earth must be firm; The design of capacitor is looked the electric pressure that is inserted and is decided with choosing, and capacitance current can design about 10mA, a plurality of capacitors in series places in circuit of optional positive temperature coefficient (PTC) of capacitor and negative temperature coefficient close in value capacity half and half, capacitance current
(u
1Be the input primary voltage, C is a high-voltage capacitance), electrorheological voltage operational amplifier output voltage
(R
fBe the operational amplifier feedback resistance),
Lag behind
90 °.Its 90 ° of phase angle differences are proofreaied and correct by the digital integrator in the high-pressure side collector.The digital signal of collector output is through optical fiber input low pressure end merge cells, again through the Ethernet interface output data.Electrorheological voltage operational amplifier and collector are by the power supply of high-pressure side power supply, about collector, optical fiber communication equipment and merge cells all have standard compliant approved product both at home and abroad.
Referring to Fig. 2, Fig. 3; Be installed between capacitor end and the earth the electrorheological electric pressure converter is firm; The function and the connecting mode of electrorheological voltage operational amplifier, collector, optical fiber telecommunications system and merge cells are same as the previously described embodiments; Difference is that electrorheological electric pressure converter, collector and optical fiber communication equipment are installed in the capacitor base, and by the power supply of low-pressure side power supply, has improved the reliability of power supply, the functional reliability and the stability of electronic type voltage transformer.
Claims (5)
1. the straight capacitance current type primary voltage sensor of surveying is characterized in that: by the firm serial connection electrorheological of capacitor electric pressure converter, constitute the straight capacitance current type primary voltage sensor of surveying.
2. the capacitor of straight survey capacitance current type primary voltage sensor according to claim 1; It is characterized in that: adopt a plurality of capacitors in series of positive temperature coefficient (PTC) and negative temperature coefficient close in value capacity half and half to form, or the adding temperature sensor carries out temperature compensation.
3. straight survey capacitance current type primary voltage sensor according to claim 1; It is characterized in that: the electrorheological electric pressure converter is by electrorheological voltage operational amplifier input end and connect the input end of TVS pipe back as the electrorheological electric pressure converter, and the output voltage terminal of operational amplifier is as the straight output voltage terminal of surveying capacitance current type primary voltage sensor.
4. straight survey capacitance current type primary voltage sensor according to claim 1; It is characterized in that: electrorheological electric pressure converter input end is firm to be serially connected between phase voltage and the capacitor top (high-pressure side), constitutes high-pressure side and directly surveys capacitance current type primary voltage sensor.
5. straight survey capacitance current type primary voltage sensor according to claim 1; It is characterized in that: electrorheological electric pressure converter input end is firm to be serially connected between capacitor end (low pressure end) and the earth, constitutes low pressure end and directly surveys capacitance current type primary voltage sensor.
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| CN2012100144899A CN102539888A (en) | 2012-01-18 | 2012-01-18 | Direct measurement capacitance-current primary voltage sensor |
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| CN2012100144899A CN102539888A (en) | 2012-01-18 | 2012-01-18 | Direct measurement capacitance-current primary voltage sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203829A (en) * | 2015-10-22 | 2015-12-30 | 国家电网公司 | Power frequency high voltage measuring device of high voltage standard capacitor based on SF6 gas insulation |
| CN107064612A (en) * | 2017-02-28 | 2017-08-18 | 上海交通大学 | Single-phase overhead transmission line of electricity phase voltage measuring method |
| CN107991642A (en) * | 2017-12-01 | 2018-05-04 | 三峡大学 | A kind of powered Compare System of voltage transformer error |
| CN108872678A (en) * | 2018-07-04 | 2018-11-23 | 武汉黎赛科技有限责任公司 | A kind of AC voltage sensor |
| WO2021098325A1 (en) * | 2019-11-18 | 2021-05-27 | 珠海许继电气有限公司 | Voltage acquisition and compensation circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2689243Y (en) * | 2004-04-20 | 2005-03-30 | 西安高研电器有限责任公司 | Electronic voltage sensor with double shielding electode |
| CN101000363A (en) * | 2006-12-08 | 2007-07-18 | 长沙同庆电气信息有限公司 | Electronic veltage transformer of capacitor or resistance series hollow coil |
| CN101158712A (en) * | 2007-09-17 | 2008-04-09 | 西安交通大学 | Measurement mechanism and measurement method of ferroelectric materials electric hysteresis loop wire |
| CN201335857Y (en) * | 2008-12-26 | 2009-10-28 | 中国西电电气股份有限公司 | Voltage sensor for high-voltage DC transmission |
| CN101614766A (en) * | 2009-07-29 | 2009-12-30 | 河南电力试验研究院 | A kind of circuit that is used to eliminate voltage measurement error of high voltage standard capacitor divider |
| CN202583294U (en) * | 2012-01-18 | 2012-12-05 | 周有庆 | A primary voltage sensor capable of directly measuring capacitive current |
-
2012
- 2012-01-18 CN CN2012100144899A patent/CN102539888A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2689243Y (en) * | 2004-04-20 | 2005-03-30 | 西安高研电器有限责任公司 | Electronic voltage sensor with double shielding electode |
| CN101000363A (en) * | 2006-12-08 | 2007-07-18 | 长沙同庆电气信息有限公司 | Electronic veltage transformer of capacitor or resistance series hollow coil |
| CN101158712A (en) * | 2007-09-17 | 2008-04-09 | 西安交通大学 | Measurement mechanism and measurement method of ferroelectric materials electric hysteresis loop wire |
| CN201335857Y (en) * | 2008-12-26 | 2009-10-28 | 中国西电电气股份有限公司 | Voltage sensor for high-voltage DC transmission |
| CN101614766A (en) * | 2009-07-29 | 2009-12-30 | 河南电力试验研究院 | A kind of circuit that is used to eliminate voltage measurement error of high voltage standard capacitor divider |
| CN202583294U (en) * | 2012-01-18 | 2012-12-05 | 周有庆 | A primary voltage sensor capable of directly measuring capacitive current |
Non-Patent Citations (1)
| Title |
|---|
| 吴涛 等: "新型电子式电压互感器及其误差分析", 《电网技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203829A (en) * | 2015-10-22 | 2015-12-30 | 国家电网公司 | Power frequency high voltage measuring device of high voltage standard capacitor based on SF6 gas insulation |
| CN107064612A (en) * | 2017-02-28 | 2017-08-18 | 上海交通大学 | Single-phase overhead transmission line of electricity phase voltage measuring method |
| CN107991642A (en) * | 2017-12-01 | 2018-05-04 | 三峡大学 | A kind of powered Compare System of voltage transformer error |
| CN108872678A (en) * | 2018-07-04 | 2018-11-23 | 武汉黎赛科技有限责任公司 | A kind of AC voltage sensor |
| WO2021098325A1 (en) * | 2019-11-18 | 2021-05-27 | 珠海许继电气有限公司 | Voltage acquisition and compensation circuit |
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Owner name: CHANGSHA YINHUA ELECTRIC EQUIPMENT CO., LTD. Free format text: FORMER OWNER: ZHOU YOUQING Effective date: 20120801 |
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Effective date of registration: 20120801 Address after: 410082 School of electrical and information engineering, Hunan University, Changsha, Hunan, Applicant after: Changsha Yinhua Electric Equipment Co., Ltd. Address before: 410082 School of electrical and information engineering, Hunan University, Changsha, Hunan, Applicant before: Zhou Youqing |
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Effective date of registration: 20130220 Address after: Yuelu District City, Hunan province 410082 Changsha Lushan Lushan Road South Gate Applicant after: Hunan University Address before: 410082 School of electrical and information engineering, Hunan University, Changsha, Hunan, Applicant before: Changsha Yinhua Electric Equipment Co., Ltd. |
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Application publication date: 20120704 |