CN101667489A - Current mode electronic voltage transformer for detecting capacitance or resistance - Google Patents
Current mode electronic voltage transformer for detecting capacitance or resistance Download PDFInfo
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- CN101667489A CN101667489A CN200810143106A CN200810143106A CN101667489A CN 101667489 A CN101667489 A CN 101667489A CN 200810143106 A CN200810143106 A CN 200810143106A CN 200810143106 A CN200810143106 A CN 200810143106A CN 101667489 A CN101667489 A CN 101667489A
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Abstract
The invention discloses a current mode electronic voltage transformer using a current transducer to detect capacitance or resistance, which comprises that: a primary voltage is connected to a capacitor or a resistor and connected in series with a primary coil of the current transducer, and the other end of a primary voltage is grounded; one end of a secondary coil is grounded; a secondary currentsignal is connected with an electronic signal processing device; and secondary voltage signal output changed in proportion to a primary high voltage is acquired by detecting the current signal. The current mode electronic voltage transformer can be used for manufacturing a conventional voltage transformer of which ultra-high voltage and different voltage levels lower than the ultra-high voltage inan electric power system meet requirements of related standards, and also can be used for manufacturing the electronic voltage transformer of which each voltage level meets requirements of IEC60044 and related standards. One end of each of the primary current coil and the secondary current coil of the current transducer is reliably grounded respectively, and the electronic voltage transformer realizes isolation of secondary equipment and the primary voltage, and ensures safety of the secondary equipment and human bodies. The electronic voltage transformer has the characteristics of simple structure, energy saving, environmental protection, high measurement accuracy, no ferroresonance, good transient characteristics, wide frequency band, strong anti-jamming capability, safe, stable and reliable operation and the like.
Description
Technical field
The present invention relates to a kind of voltage transformer, especially relate to detection electric capacity or resistor current type electronic type voltage transformer that a kind of metering, observing and controlling and relaying protection required voltage that is used for the various electric pressures of electric power system measured.
Background technology
Main both at home and abroad electromagnetic potential transformer and capacitance partial pressure (CVT) the formula voltage transformer of adopting of present existing voltage transformer.Also researched and developed optical voltage transformer (OVT) in recent years abroad and based on the electronic type voltage transformer of the electronic type voltage transformer of electric capacity or electric resistance partial pressure type and electric capacity or resistance serial connection air core coil.
Electromagnetic potential transformer insulation system complexity generally is placed in the fuel tank, and large body and heavy mass is unfavorable for environmental protection and energy-conservation, and ferro resonance may take place the cost height, and certainty of measurement is lower; And the capacitive divided voltage instrument transformer is owing to have intermediate transformer and a compensation reactor, and complex structure and being placed in the fuel tank is unfavorable for energy-conservation and environmental protection, exists the hidden danger of ferro resonance and the shortcoming of transient error poor-performing.
The basic principle of optical voltage transformer is to utilize the physical effect of optical material, carries out voltage measurement as bubble Ke Ersi (Pockels) effect, electric light Ke Er (Kerr) effect and inverse piezoelectric effect etc.Because optical material is subjected to the influence of factors such as ambient temperature and mechanical oscillation bigger, though existing model machine linked network trial run both at home and abroad, but stability, the reliability of operation are not high, and cost an arm and a leg, also have many key technologies such as phase angle measurement not to be resolved, therefore fail to form product and apply in electric power system.
Based on the sensing principle of electric capacity or electric resistance partial pressure type electronic type voltage transformer is that centre tap at high-voltage capacitor or resistor obtains the low voltage signal that is directly proportional and changes with a sub-high pressure with the earth or high-pressure side, directly introduce the electronic signal process circuit, its defective is that secondary side low-voltage and primary side high voltage directly are coupled, there is not electrical isolation, there is potential safety hazard, and antijamming capability is relatively poor, precision and transient error poor-performing.
The electronic type voltage transformer of electric capacity or resistance serial connection air core coil, it is the inventor's patented technology in early stage, its basic principle is to measure the perhaps little electric current in high-tension resistive loop (hundreds of milliamperes) of high-tension electricity with air core coil, induce at secondary side and to become 90 ° voltage signal with primary current, obtain the voltage signal that is directly proportional and changes with a sub-high pressure through signal processing circuit on the spot, transmission system by complexity is transferred to the control room with voltage signal again, also is in development at present.This kind electronic type voltage transformer has solved the technical barrier of a secondary side low pressure and a high-voltage electrical apparatus isolation, but hollow coil current-sensing device is difficult to guarantee certainty of measurement to the measurement of Weak current signal, in order to improve antijamming capability, signal processing circuit can only be placed on same position with electric capacity or resistor, voltage signal transmission system complexity, operational environment is relatively poor, is subject to disturb, the stability and the reliability of work are not high, are difficult to form product and apply in electric power system.
Summary of the invention
For solving existing all technical problems of above-mentioned various voltage transformer and defective, the method that the present invention adopts high precision electric current transducer to detect electric capacity or resistor current first provide a kind of simple in structure, volume is little, in light weight, cost is lower, no ferro resonance, power output is big, certainty of measurement is high and be not subjected to frequency change to influence, save fuel tank energy-conserving and environment-protective, secondary side and a high-pressure side that electrical isolation, antijamming capability new-style electronic voltage transformer strong, safe and reliable to operation are arranged.
The technical scheme that the present invention solves the problems of the technologies described above is: primary voltage connects electric capacity or resistance and current sensor primary winding one end positive connection, other end reliable ground.Current sensor secondary coil one end ground connection; on the spot or with two long leads the secondary current signal is caused the control room and connect electronic signal processing apparatus and obtain secondary voltage signal with primary voltage variation in direct ratio; supply with metering, observing and controlling and protective relaying device, constituted detection electric capacity or resistor-type electronic type voltage transformer.
In the above-mentioned detection capacitance current type electronic type voltage transformer, the current-voltage conversion amplifying circuit that the secondary current signal of current sensor connects electronic signal processing apparatus obtains voltage signal, regulate current-voltage conversion amplifying circuit feedback resistance adjustable size joint output voltage signal size, the synchronous voltage signal of same frequency that this voltage signal inputs to integral amplifier again, phase-correcting circuit obtains is directly proportional and changes with primary voltage.The phase-correcting circuit output voltage signal can constitute the detection capacitance current type electronic type voltage transformer that each electric pressure satisfies IEC60044 and relevant criterion requirement through low-power amplifier; The phase-correcting circuit output voltage signal can also insert high-power amplifying circuit, constitutes the conventional criteria voltage transformer that satisfies output voltage and power output requirement of each electric pressure.
In the above-mentioned detection resistor current type electronic type voltage transformer, current-voltage conversion amplifying circuit and phase-correcting circuit that the secondary current signal of current sensor connects electronic signal processing apparatus obtain the synchronous voltage signal of same frequency that is directly proportional and changes with primary voltage, regulate current-voltage conversion amplifying circuit feedback resistance adjustable size joint output voltage signal size, the output voltage signal of phase-correcting circuit can constitute the high pressure that satisfies IEC60044 and relevant criterion requirement and detect resistor current type electronic type voltage transformer through low-power amplifier; The phase-correcting circuit output voltage signal can also insert high-power amplifying circuit, constitutes the high pressure conventional criteria voltage transformer that satisfies output voltage and power demand.
Technique effect of the present invention: 1) voltage of each electric pressure inserts and is the capacitor of high impedance value or resistor, again with the earth between the current sensor primary winding that is connected in series, the primary circuit electric current is generally hundreds of milliamperes of electric currents, secondary loop current is directly proportional with the primary circuit electric current and changes and same-phase, adopt 0.01 grade of current sensor, numerical error is less than 0.01%, phase angle error is less than 0.5 minute, and being used to detect electric capacity or resistor current, to have a volume little, in light weight, the certainty of measurement height, the linearity is good, good insulation preformance, the fuel tank energy-conserving and environment-protective have been saved, magnetic saturation can not appear, realized voltage transformer once with the advantages such as electrical isolation of secondary; 2) current sensor is introduced the control room electronic signal processing apparatus with the secondary current signal by copper conductor, outdoor primary transducer and complicated signal transmission system electronic circuit and one action power supply have been saved, greatly improved the operational environment of electronic type voltage transformer, utilize the differential principle of copper conductor transmission current signal to improve antijamming capability, avoided existing various conventional voltage transformer secondary voltage signals to introduce the conductor resistance pressure drop that the control room causes, improved the certainty of measurement of voltage transformer with lead; 3) electronic signal processing apparatus adopts high-precision operational amplifier, formations such as integrating amplification circuit and power amplification circuit and secondary working power, and be placed on the control room, greatly improved operational environment, thereby guaranteed the precision and the power demand of electronic signal process link output secondary voltage, improved the stability and the reliability of equipment work; 4) can make the electronic type voltage transformer that each electric pressure satisfies IEC60044 and relevant criterion easily, and have characteristics simple in structure, that certainty of measurement is high, antijamming capability is strong; 5) can make the electronic type voltage transformer that each electric pressure satisfies output voltage and power requirement easily and substitute conventional electromagnetic type and capacitive divided voltage instrument transformer, and have simple in structure, small and light, save the fuel tank energy-conserving and environment-protective, characteristics such as certainty of measurement height, antijamming capability are strong, no ferro resonance; 6) between capacitor end and the earth if desired, can access gap protection, cause equipment and personal safety accident in case current sensor primary winding and the earth joint get loose.
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 detects the embodiment that capacitance current type electronic type voltage transformer substitutes conventional voltage transformer for the present invention.
Fig. 2 detects the embodiment that capacitance current type electronic type voltage transformer satisfies IEC60044 and relevant criterion for the present invention.
Fig. 3 detects the embodiment that resistor current type electronic type voltage transformer substitutes conventional voltage transformer for the present invention.
Fig. 4 detects the embodiment that resistor current type electronic type voltage transformer satisfies IEC60044 and relevant criterion for the present invention.
Embodiment
Referring to Fig. 1, be applicable to the detection capacitance current type electronic type voltage transformer of the alternative conventional voltage transformer of each electric pressures such as ultra high voltage, superhigh pressure, high pressure, mesolow, 1 is the high voltage bus lead end, voltage is
2 equivalent high-voltage capacitors for the high voltage bus serial connection; 3 is current sensor, can select 0.01 grade of high precision electric current transducer for use, and numerical error is less than 0.01%, and phase angle error was less than 0.5 minute.Primary winding one end of current sensor 3 reliably is connected other end reliable ground with high-voltage capacitor 2; 15 are protection gap, a termination high-voltage capacitor 2 ends, other end reliable ground.High-voltage capacitor appearance value is little, and 1/ ω C capacitive reactance is big, and current sensor induction reactance ω L is little, and ω L＜＜1/ ω C, resonance frequency up to hundreds of to thousands of kHz, thereby can effectively avoid the generation of ferro resonance; 17 is the insulating ceramics sleeve pipe.The electric current of high-voltage capacitor 2 and current sensor 3 primary circuits
Be generally 100～200 milliamperes, and leading voltage
Phase angle be 90 °.The secondary coil one end ground connection of current sensor 3 connects electronic signal processing apparatus 6 by two leads 5, obtains the secondary voltage signal with primary voltage variation in direct ratio, supplies with metering, observing and controlling and protective relaying device.
In the foregoing description, current sensor 3 can be connected with capacitor 2 on the spot with electronic signal processing apparatus 6, concentrate and be produced in the device, also current sensor 3 and capacitor 2 can be installed on the spot, the secondary coil of current sensor 3 connects two long leads 5 and the secondary current signal is caused the control room inserts electronic signal processing apparatus 6 again.The latter is more desirable in actual applications, adopts lead differential type ground conductive electrical current signal antijamming capability strong, and the lead pressure drop can reduce lead conduction voltage signal the time, the raising certainty of measurement.The cross section of two long leads is chosen and will be chosen according to the all-in resistance of lead, and the all-in resistance of two leads 5 requires less than 50 ohm, and is the smaller the better.As per 1000 meters of 2.5 square millimeters of copper conductors, resistance is about 3 ohm, and the switchyard high-voltage capacitor is assumed to be 1000 meters from the control room, and the all-in resistance of two leads is about 6 ohm, satisfies the certainty of measurement requirement of current sensor fully.
In the foregoing description, the secondary current signal of current sensor 3 is earlier through current-voltage conversion amplifying circuit 7, this amplifying circuit adopts voltage negative feedback operational amplifier in parallel, current signal is converted to the voltage signal that is directly proportional with it, regulates feedback resistance adjustable size joint output voltage signal size; Current-voltage conversion amplifying circuit 7 also usable samples resistance becomes voltage signal with current signal, again through the amplification voltage signal of instrument amplifier differential type; Current-voltage conversion amplifying circuit 7 output voltage signals insert integrating amplification circuit 8, make 90 ° of its output voltage phase shifts, insert phase-correcting circuit 9 again, the phase angle error of output voltage signal is adjusted, obtain the same frequency same-phase voltage signal that is directly proportional with a sub-high pressure.This output voltage signal connects high-power amplifying circuit 10, makes output voltage and power satisfy the outputting standard demand of conventional voltage transformer.11 is the power supply incoming end of electronic signal processing apparatus.The 220V direct current or the interchange of being drawn by the control room direct current system insert 11 ends, and through power module 12, one tunnel output ± 110V stable DC electricity is supplied with high-power amplifying circuit 10, thereby guarantee power amplifier reliablely and stablely output voltage and power; Prefix operation amplifier in one tunnel output ± 15V direct current supplying electric current-voltage transformation amplifying circuit 7, integrating circuit 8, phase-correcting circuit 9 and the high-power amplifying circuit 10 etc.
In the foregoing description, when detecting capacitance current type electronic type voltage transformer as if the metering that needs the multichannel different capacity, the output of protection voltage, available a plurality of current sensors 3 are introduced multichannel electronic signal processing apparatus 6 with the secondary current signal respectively; Also can current signal be introduced multichannel electronic signal processing apparatus 6 respectively by two leads 5 of secondary coil of current sensor 3; Also can insert one road current-voltage conversion amplifying circuit 7, integrating amplification circuit 8 and phase-correcting circuit 9 by two leads of secondary coil 5 of current sensor 3; the output signal of phase-correcting circuit 9 is connect the high-power amplifying circuit 10 that a plurality of different capacities are exported respectively, obtain metering, the output of protection voltage of different capacity output.3p; 6p level protection voltage output effective value is higher; and can not export so high alternating voltage by the high-power amplifying circuit 10 of ± 110V direct current supply; the output phase voltage of high-power amplifying circuit 10 can be connect single-phase step-up transformer 13 output voltages; can satisfy the output of precision and power fully; the advantage that adopts this mode is the working power that a plurality of high-power amplifying circuits can shared one ± 110V; and do not need to look in addition higher working power; can certainly adopt the more high-tension working power of output to supply with high-power amplifying circuit, directly obtain 3p; the higher effective value voltage output of 6p level.
In the embodiment shown in Figure 2, satisfy a voltage transformer needs output small magnitude, lower powered voltage signal that IEC60044 and relevant criterion require, therefore only need a working power 12 to give 7,8,9 and low-power amplifier 16 power supplies, constitute each electric pressure and satisfy the detection capacitance current type electronic type voltage transformer that IEC60044 and relevant criterion require.With the electronic voltage formula instrument transformer that is connected in series air core coil based on capacitance-voltage-distributing type electronic type voltage transformer and electric capacity or resistance relatively, precision is higher, antijamming capability is stronger, once with secondary voltage electrical isolation is arranged, and is safer, reliable.
In another embodiment, as shown in Figure 3, a sub-high pressure
Connect the big resistance 4 of high pressure, the reliable primary winding that inserts current sensor 3 between the big resistance other end and the earth, the secondary coil one end ground connection of current sensor 3, connect electronic signal processing apparatus 6 by two leads 5, constitute and detect the embodiment that resistor current type electronic type voltage transformer substitutes conventional voltage transformer, the electric current and the primary voltage of big resistance 4 and current sensor 3 primary circuits
Same-phase is not so need to use 90 ° of 8 pairs of voltage signal phase shifts of integrating amplification circuit again in electronic signal processing apparatus 6.Other electronic signal process circuit is with embodiment illustrated in fig. 1 the same.
Fig. 4 is for detecting the embodiment that resistor current type electronic type voltage transformer satisfies IEC60044 and relevant criterion requirement.The electric current and the primary voltage U of big resistance 4 and current sensor 3 primary circuits
1Same-phase is not so need with integrating amplification circuit 90 ° of voltage signal phase shifts again.Other electronic signal process circuit is the same with embodiment shown in Figure 2.
Fig. 3, embodiment shown in Figure 4, analyze from structure and principle, can detect resistor current type electronic type voltage transformer in order to make each electric pressure, but, be adapted at present using in the intermediate voltage electric power system owing to big resistance manufacturing process of high pressure and precision.Along with the raising of the manufacturing process and the precision of the big resistance of high pressure, in high-voltage electric power system, also can use in the future.
Claims (10)
1, a kind of detection electric capacity or resistor current type electronic type voltage transformer, it is characterized in that: comprise by primary voltage connecing electric capacity or resistance and being connected in series primary winding and another termination the earth of current sensor, the secondary coil one end ground connection of current sensor, and the secondary current signal connects electronic signal processing apparatus output secondary voltage signal formation.
2, detection capacitance current type electronic type voltage transformer according to claim 1, it is characterized in that: the primary current coil of capacitance series current sensor, its secondary current coil connecting resistance or current-voltage conversion amplifying circuit obtain voltage signal, regulate the feedback resistance of current-voltage conversion amplifying circuit, the size of adjustable output voltage, again with this voltage signal input integral amplifier, phase-correcting circuit obtains and the synchronous voltage signal of same frequency of the linear variation of a sub-high pressure.
3, according to claim 1 and 2 described electronic type voltage transformers, it is characterized in that: the output voltage signal of phase-correcting circuit inserts low-power amplifier, constitutes the electronic type voltage transformer that each electric pressure satisfies IEC60044 and relevant criterion requirement.
4, according to claim 1 and 2 described electronic type voltage transformers, it is characterized in that: the output voltage signal of phase-correcting circuit inserts high-power amplifying circuit, constitutes each electric pressure and satisfies the conventional voltage transformer that relevant criterion requires.
5, detection resistor current type electronic type voltage transformer according to claim 1, it is characterized in that: the primary current coil of resistance serial connection current sensor, its secondary current coil connecting resistance or current-voltage conversion amplifying circuit, regulate the feedback resistance of current-voltage conversion amplifying circuit, the size of adjustable output voltage.With this voltage signal input phase correcting circuit, obtain the synchronous voltage signal of same frequency that is directly proportional and changes with a sub-high pressure again
6, according to claim 1 and 5 described electronic type voltage transformers, it is characterized in that: the output voltage signal of phase-correcting circuit inserts low-power amplifier, constitutes the electronic type voltage transformer that each electric pressure satisfies IEC60044 and relevant criterion requirement.
7, according to claim 1 and 5 described electronic type voltage transformers, it is characterized in that: the output voltage signal of phase-correcting circuit inserts high-power amplifying circuit, constitutes each electric pressure and satisfies the conventional voltage transformer that relevant criterion requires.
8, can also connect transformer according to claim 4 and the 7 described outputs that any detects the high-power amplifying circuit of electric capacity or resistor current type electronic type voltage transformer, obtain the output of protected level voltage at its secondary side.
9, any current sensor primary winding that detects electric capacity or resistor current type electronic type voltage transformer be connected in series with electric capacity or resistance and ground connection is installed in same position according to claim 1-8, the secondary current signal of current sensor is introduced the secondary voltage signal that the control room connects electronic signal processing apparatus and obtain the variation that is directly proportional with primary voltage with copper conductor export; Perhaps current sensor and electronic signal processing apparatus with high-tension electricity perhaps the resistance same position install on the spot, the secondary voltage signal is introduced the control room.
10, any power supply that detects the electronic signal processing apparatus of electric capacity or resistor current type electronic type voltage transformer can also can adopt reliable and stable alternating current 220V power supply power supply by reliable and stable direct current 220V power supply power supply according to claim 1-9.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2424063A1 (en) * | 2010-08-23 | 2012-02-29 | Nexans | Quench detection system for a superconductor fault current limiter |
| CN103872930A (en) * | 2012-12-17 | 2014-06-18 | 北京华电蜂鸟科技有限责任公司 | Capacitive step-down electricity taking method suitable for transmission line tower |
| CN108152569A (en) * | 2017-11-29 | 2018-06-12 | 杭州柯林电气股份有限公司 | Cable overvoltage signal detection method and device |
| CN108226844A (en) * | 2017-11-30 | 2018-06-29 | 神华集团有限责任公司 | The method and system of monitoring voltage mutual inductor |
| CN109932619A (en) * | 2019-04-15 | 2019-06-25 | 长园深瑞继保自动化有限公司 | Power distribution network electronic sensor secondary singal collector |
| CN113260869A (en) * | 2019-01-04 | 2021-08-13 | Abb电网瑞士股份公司 | Device and method for monitoring a capacitor bank |
| CN113595367A (en) * | 2021-07-07 | 2021-11-02 | 广东电网能源发展有限公司 | High-voltage line power taking device |
| CN113625038A (en) * | 2021-06-23 | 2021-11-09 | 武汉钢铁有限公司 | Current measuring device and voltage and current measuring device |
| CN114252685A (en) * | 2021-12-30 | 2022-03-29 | 国网上海能源互联网研究院有限公司 | Electronic voltage sensor and voltage measuring method adopting same |
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2008
- 2008-09-01 CN CN200810143106A patent/CN101667489A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2424063A1 (en) * | 2010-08-23 | 2012-02-29 | Nexans | Quench detection system for a superconductor fault current limiter |
| CN102420415A (en) * | 2010-08-23 | 2012-04-18 | 尼克桑斯公司 | Quench detection system for a superconductor fault current limiter |
| CN103872930A (en) * | 2012-12-17 | 2014-06-18 | 北京华电蜂鸟科技有限责任公司 | Capacitive step-down electricity taking method suitable for transmission line tower |
| CN108152569A (en) * | 2017-11-29 | 2018-06-12 | 杭州柯林电气股份有限公司 | Cable overvoltage signal detection method and device |
| CN108226844A (en) * | 2017-11-30 | 2018-06-29 | 神华集团有限责任公司 | The method and system of monitoring voltage mutual inductor |
| CN113260869A (en) * | 2019-01-04 | 2021-08-13 | Abb电网瑞士股份公司 | Device and method for monitoring a capacitor bank |
| CN113260869B (en) * | 2019-01-04 | 2024-04-16 | 日立能源有限公司 | Device and method for monitoring a capacitor bank |
| CN109932619A (en) * | 2019-04-15 | 2019-06-25 | 长园深瑞继保自动化有限公司 | Power distribution network electronic sensor secondary singal collector |
| CN109932619B (en) * | 2019-04-15 | 2022-02-22 | 长园科技集团股份有限公司 | Secondary signal collector of electronic sensor of power distribution network |
| CN113625038A (en) * | 2021-06-23 | 2021-11-09 | 武汉钢铁有限公司 | Current measuring device and voltage and current measuring device |
| CN113595367A (en) * | 2021-07-07 | 2021-11-02 | 广东电网能源发展有限公司 | High-voltage line power taking device |
| CN114252685A (en) * | 2021-12-30 | 2022-03-29 | 国网上海能源互联网研究院有限公司 | Electronic voltage sensor and voltage measuring method adopting same |
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