CN101299386A - Wide band high voltage intelligent resistance type voltage current combined sensor - Google Patents
Wide band high voltage intelligent resistance type voltage current combined sensor Download PDFInfo
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- CN101299386A CN101299386A CNA2008100307442A CN200810030744A CN101299386A CN 101299386 A CN101299386 A CN 101299386A CN A2008100307442 A CNA2008100307442 A CN A2008100307442A CN 200810030744 A CN200810030744 A CN 200810030744A CN 101299386 A CN101299386 A CN 101299386A
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Abstract
The invention discloses a wide frequency high voltage intelligent resistance type voltage current combination sensor, comprising a resistance type voltage divider (1) for extracting the voltage signal from the measured loop, a diverter (2) for extracting the voltage signal of the millivolt level from the measured current loop, a high voltage side signal processing device (3) for transmitting the analog voltage signal output by the resistance type voltage divider (1) and the diverter (2) into the digital signals for operation process, a communication optical group (6) for connecting the high voltage side signal processing device (3) and the low voltage side digital display terminal (7), a high voltage side power (4) for providing the working power to the high voltage side signal processing device (3), a high voltage insulation transformer (5) for connecting the high voltage side power (4) and the low voltage side power supply electric network. The invention has high measurement accuracy, high linearity, a low temperature shift, easy calibration, high insulation voltage and strong anti-jamming ability.
Description
Technical field
The present invention relates to a kind of wide band high voltage intelligent resistance type voltage current combined sensor that is used for alternating current-direct current, variable-frequency motor measurement.
Background technology
Along with the development of converter technique, variable-frequency motor is used widely, because wide and contain complicated high order harmonic component to the variable frequency power supply reference frequency output of variable-frequency motor power supply, traditional instrument transformer can not satisfy electric parameters testing.
Hall voltage sensor test frequency range broad, can satisfy the fundamental voltage test of variable-frequency motor preferably, but test bandwidth at present usually less than 15kHz, especially the Hall voltage sensor test bandwidth more than the 3000V electric pressure still can not accurately be measured for the high order harmonic component of variable-frequency motor voltage signal usually less than 5kHz.Resistance divider has good frequency characteristic and linearity, but because output without isolation, generally is used as vdct with resistance divider at present, or pulse voltage, or the surge voltage test, one termination the earth when its common feature is test.In prior art, also do not adopt resistance divider to replace the voltage sensor that traditional instrument transformer is used for the frequency-changing AC high voltage test.
Shunt is especially rolled over belt shunt, Disc Shunt, coaxial shunt etc., has frequency characteristic preferably, but because output is without isolation, generally dull and stereotyped shunt is tested as direct current at present, and folding belt shunt, Disc Shunt and coaxial shunt etc. generally are used for pulse current or impulse current test, one termination the earth when its common feature is test.In addition, because the signal amplitude of shunt output is less, during rated current, its corresponding voltage signal is generally less than 250mV, and the way that traditional transducer separates with instrument causes signal transmission line longer, and signal is introduced various interference easily in longer Distance Transmission process, influence measuring accuracy.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, provide that a kind of frequency response range is wide, AC/DC universal, Validity Test wide ranges, no magnetic saturation problem, certainty of measurement height, high linear, low temperature float easy calibration, isolation voltage height, wide band high voltage intelligent resistance type voltage current combined sensor that antijamming capability is strong.
Technical scheme of the present invention is: utilize resistance divider and shunt good frequency characteristic and linearity, adopt resistance divider and shunt to replace the senser element of traditional voltage transformer summation current transformer respectively as ac high voltage and high-current test, measuring circuit and resistance divider and shunt are combined closely, adopt floating ground structure, measurement data is uploaded to low-pressure side digital display terminal in the digital quantity mode by optical fiber and realizes signal transmission and high pressure isolation.
The present invention is made of following assembly: a resistance divider (1) that is used for taking out from tested voltage circuit voltage signal, a shunt (2) that is used for taking out the millivolt magnitude voltage signals from tested current circuit, analog voltage signal that is used for the output of resistance divider (1) and shunt (2) changes the digital signal high-side signal processing unit (3) that row operation handles of going forward side by side into, one group of communication optical fiber group (6) that connects high-side signal processing unit (3) and low-pressure side digital display terminal (7), one is the high-pressure side power supply (4) that high-side signal processing unit (3) provides working power, a high voltage isolating transformer (5) that connects high-pressure side power supply (4) and low-pressure side power supply grid.
Described resistance divider (1) is made up of high-voltage arm resistance R 1 and low-voltage arm resistance R2, and R1 and R2 are noninductive resistance, and together is encapsulated in the shielded metal tube of insulating material embedding.
Described shunt (2) is selected flat shunt or folding belt shunt or Disc Shunt or coaxial-type shunt for use according to bandwidth requirement.
The former limit of described high voltage isolating transformer (5) and secondary are connected with low-pressure side power supply grid and high-pressure side power supply (4) respectively.
Described high-side signal processing unit (3) is made up of signal amplification circuit 3D, AD converter IC1, microprocessor IC2, serial data transmitter 3C.
Described high-side signal processing unit (3) also comprises a kind of among sampling clock receiver 3A or the Gbps serial receiver 3B or their combination.
Described communication optical fiber group (6) is made up of at least one communication optical fiber 6C, and communication optical fiber 6C is connected with serial data transmitter 3C and low-pressure side digital display terminal (7) in the high-side signal processing unit (3).
Described communication optical fiber group (6) also comprises one or their combination among communication optical fiber 6A or the communication optical fiber 6B, wherein communication optical fiber 6A is connected with sampling clock receiver 3A and low-pressure side digital display terminal (7), and communication optical fiber 6B is connected with Gbps serial receiver 3B and low-pressure side digital display terminal (7).
The present invention has that frequency response range is wide, AC/DC universal, Validity Test wide ranges, no magnetic saturation problem, Keep Clear-High Voltage for no second open circuit, certainty of measurement height, high linear, advantage such as low temperature floats, easily calibration, isolation voltage height, antijamming capability are strong, is suitable for places uses such as motor manufacturing enterprise, motor research and motor inspection center.
Description of drawings
Fig. 1 is a principle of the invention block diagram;
Fig. 2 is the circuit diagram of embodiment 1;
Fig. 3 is the circuit diagram of embodiment 2;
Fig. 4 is the circuit diagram of embodiment 3;
Fig. 5 is the circuit diagram of embodiment 4;
Fig. 6 is the circuit diagram of embodiment 5.
Among the figure: 1-resistance divider, 2-shunt, 3-high-side signal processing unit, 4-high-pressure side power supply, 5-high voltage isolating transformer, 6-communication optical fiber group, 7-low-pressure side digital display terminal.
Among Fig. 6: S1-1 wide band high voltage intelligent resistance type voltage current combined sensor, S2-2 wide band high voltage intelligent resistance type voltage current combined sensor.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
Because microprocessor IC2 and IC3 have all used serial data receiving terminal RXD0 and serial data transmit port TXD0 among the embodiment, for convenience of description, are labeled as 3-RXD0,3-TXD0,7-RXD0,7-TXD0 among the figure respectively; Also adopt serial data receiving terminal RXD1 and the serial data transmit port TXD1 of IC3 among the embodiment 5, be labeled as 7-RXD1,7-TXD1.
Embodiment 1: see figures.1.and.2:
Present embodiment comprises the resistance divider (1) that takes out voltage signal from tested voltage circuit, from tested current circuit, take out the shunt (2) of millivolt magnitude voltage signals, high-side signal processing unit (3), high-pressure side power supply (4), high voltage isolating transformer (5), communication optical fiber group (6), low-pressure side digital display terminal (7).
Present embodiment low-pressure side power supply grid adopts the AC220V civil power.
The analog voltage signal of resistance divider (1) and shunt (2) output links to each other with high-side signal processing unit (3), high-side signal processing unit (3) changes the analog voltage signal of resistance divider (1) and shunt (2) output into the digital signal union to be handled the back and is uploaded to low-pressure side digital display terminal (7) by optical fibre set (6), high-pressure side power supply (4) provides working power for high-side signal processing unit (3), and the former limit of high voltage isolating transformer (5) and secondary link to each other with AC220V civil power and high-pressure side power supply (4) respectively.
Resistance divider (1) comprises high-voltage arm resistance R 1 and low-voltage arm resistance R2, in the present embodiment, R1 adopts 6M Ω/30W high voltage precision noninductive resistance, maximum operating voltage reaches 70kV, and R2 adopts the accurate noninductive resistance of 3k Ω/0.25W, and R1 and R2 are encapsulated in the shielding copper pipe 1A, 1A is interior with epoxy resin 1B insulation embedding, the highest VDCT volts ,direct-current ,test can reach 20kV, and the highest alternating-current measurement voltage can reach 14kV, can satisfy the various operating mode voltage testers of 10kV alternating current-direct current, variable-frequency motor.
In the present embodiment, shunt (2) adopts coaxial shunt R3, and resistance value is about 37u Ω, and signal bandwidth is not less than 100kHz, and the continuous current measuring range is 0～2000A, and the short-time overload electric current can reach 4000A.
In the present embodiment, high-pressure side power supply (4) adopts the typical linear power supply, constitute (having omitted devices such as filter capacitor among the figure) by transformer T1, rectifier bridge B1, B2 and three-terminal regulator block V1, V2, V3 etc., for high-side signal processing unit (3) provides working power.
The former limit of high voltage isolating transformer (5) and secondary are connected with AC220V civil power and high-pressure side power supply (4) respectively, in the present embodiment, the former limit of high voltage isolating transformer (5) and the secondary turn ratio are 1: 1, the isolation of former limit and secondary is withstand voltage to be not less than 20kV, the high-tension measurement side (comprise tested voltage circuit, resistance divider 1, shunt 2, high-side signal handle adorn 3, high-pressure side power supply 4) and the AC220V civil power between play the high pressure buffer action.
Present embodiment low-pressure side digital display terminal (7) is made up of sampling clock transmitter 7A, serial data transmitter 7B, Gbps serial receiver 7C, microprocessor IC3 and data presentation device 7D, described 7A, 7B adopt fiber optic transmitter HFBR-1521, electrify/the light transformation, 7C adopts fiber optic receiver HFBR-2521, play light/electric transformation, IC3 adopts single-chip microcomputer CY7C68013, and 7D adopts computer.The electric signal input end of sampling clock transmitter 7A links to each other with the T0OUT pin of microprocessor IC3, the electric signal input end of serial data transmitter 7B links to each other with the 7-TXD0 of microprocessor IC3, and the electrical signal of Gbps serial receiver 7C links to each other with the 7-RXD0 of microprocessor IC3; CY7C68013 contains a USB communication interface, adopts USB cable to be connected between microprocessor IC3 and the computer 7D, realization high-speed data communications between the two.
Present embodiment communication optical fiber group (6) is made up of three communication optical fiber 6A, 6B, 6C, 6A connects 3A and 7A, 6B connects 3B and 7B, 6C connects 3C and 7C, and communication optical fiber group (6) plays data communication between high-side signal processing unit (3) and low-pressure side digital display terminal (7) and high pressure is isolated.
Operation principle is as follows:
The tested voltage that is connected on U+ and COM two ends produces peak value through resistance divider (1) dividing potential drop and links to each other with input end of analog signal AIN1 and the simulation ground AGND of A/D converter IC1 less than the 10V voltage signal, the tested current signal that is connected on I+ and COM two ends is converted to millivolt magnitude voltage signals through shunt (2) to be changed peak value into and links to each other with the input end of analog signal AIN0 of A/D converter IC1 less than the voltage signal of 10V after signal amplification circuit 3D amplifies, IC3 produces sampled clock signal through 7A, 6A, the A/D conversion starting signal CONVSTA of 3A control IC 1, start the A/D conversion, input signal synchronized sampling to input end of analog signal AIN0 and AIN1, during the A/D EOC, IC2 reads the A/D transformation result, and the A/D transformation result carried out calculation process, data after the calculation process in the asynchronous serial mode through 3C, 6C, 7C is uploaded to the IC3 of low-pressure side digital display terminal (7), IC3 will upload computer 7D by USB cable after the data processing that receive again, and computer 7D shows the real effective of tested voltage signal as required, the first-harmonic effective value, frequency, irregularity of wave form and real-time waveform etc.
Passing to IC3, IC3 under the various control commands that computer 7D also can will need to be provided with by USB cable will instruct by reaching the IC2 of high-side signal processing unit (3) under 7B, 6B, the 3B again, in order to guarantee the communication reliability, also will reply instruction and be uploaded to IC3 by 3C, 6C, 7C after receiving instruction, IC3 will reply instruction again and be uploaded to computer 7D by USB cable.The typical case uses, wide band high voltage intelligent resistance type voltage current combined sensor can adopt multiple kinds, the agreement that can select wherein a kind of user to be familiar with by this method setting, or wide band high voltage intelligent resistance type voltage current combined sensor is uploaded information and can be comprised transient data bag, steady state data bag etc. or full detail, by the data upload that this method setting can only select the user to be concerned about, simplify the data communication of low-pressure side digital display terminal (7).
Embodiment 2:
With reference to omitted among the accompanying drawing 3:(figure with Fig. 2 in identical resistance divider 1, shunt 2, high-pressure side power supply 4, high voltage isolating transformer 5), present embodiment as different from Example 1, wide band high voltage intelligent resistance type voltage current combined sensor is indifferent to the sampling instant of measured signal in the present embodiment, promptly do not need to sample with other signal Synchronization or make phase-contrast, so high-side signal processing unit (3) saves sampling clock receiver 3A, communication optical fiber group (6) is saved communication optical fiber 6A, low-pressure side digital display terminal (7) is saved sampling clock transmitter 7A, A/D conversion starting signal CONVSTA with A/D converter IC1 directly links to each other with the clock output pin OC1A of microprocessor IC2 simultaneously, provides sampled clock signal by IC2.
Embodiment 3:
With reference to omitted among the accompanying drawing 4:(figure with Fig. 2 in identical resistance divider 1, shunt 2, high-pressure side power supply 4, high voltage isolating transformer 5), present embodiment as different from Example 1, wide band high voltage intelligent resistance type voltage current combined sensor need not to be provided with various instructions in the present embodiment, so high-side signal processing unit (3) can save Gbps serial receiver 3B, communication optical fiber group (6) can be saved communication optical fiber 6B, low-pressure side digital display terminal (7) can be saved serial data transmitter 7B.
Embodiment 4:
With reference to omitted among the accompanying drawing 5:(figure with Fig. 2 in identical resistance divider 1, shunt 2, high-pressure side power supply 4, high voltage isolating transformer 5), present embodiment as different from Example 1, wide band high voltage intelligent resistance type voltage current combined sensor both had been indifferent to the sampling instant of measured signal in the present embodiment, do not need the user that it is carried out various instruction settings yet, so high-side signal processing unit (3) saves sampling clock receiver 3A, Gbps serial receiver 3B, communication optical fiber group (6) is saved communication optical fiber 6A, 6B, low-pressure side digital display terminal (7) is saved sampling clock transmitter 7A, serial data transmitter 7B.
Embodiment 5:
With reference to Fig. 1, Fig. 2 and Fig. 6:
Present embodiment adopts two wide band high voltage intelligent resistance type voltage current combined sensors that the instantaneous value of three-phase line voltage Uab, Ucb, Uac and the three-phase phase current Ia of three-phase alternating current, Ib, Ic and effective value etc. are measured, S1 is No. 1 wide band high voltage intelligent resistance type voltage current combined sensor among the figure, and S2 is No. 2 wide band high voltage intelligent resistance type voltage current combined sensors.
High-side signal processing unit (3) among S1, the S2 is identical with high-side signal processing unit (3) among Fig. 2.
A, B, C represent three phase lines of three-phase alternating current respectively among the figure, and M is an alternating current machine; U1+ is the tested voltage input end of S1, and I1+ is the tested current input terminal of S1, and COM1 is that tested voltage and the electric current common port U2+ of S1 is the tested voltage input end of S2, and I2+ is the tested current input terminal of S2, and COM2 is tested voltage and the electric current common port of S2.
Comprise two cover communication optical fiber groups in the present embodiment, three in every cover is designated as 6A1,6B1,6C1,6A2,6B2,6C2 respectively.
Present embodiment low-pressure side digital display terminal (7) is by sampling clock transmitter 7A1,7A2, serial data transmitter 7B1,7B2, Gbps serial receiver 7C1,7C2, microprocessor IC3 and data presentation device 7D form, described 7A1,7B1,7A2,7B2 adopt fiber optic transmitter HFBR-1521,7C1,7C2 adopt fiber optic receiver HFBR-2521, and IC3 adopts single-chip microcomputer CY7C68013, and 7D adopts computer.The electric signal input end of sampling clock transmitter 7A1,7A2 links together and links to each other with the T0OUT pin of microprocessor IC3.The electric signal input end of serial data transmitter 7B1 links to each other with the 7-TXD0 of microprocessor IC3, the electric signal input end of serial data transmitter 7B2 links to each other with the 7-TXD1 of microprocessor IC3, the electrical signal of Gbps serial receiver 7C1 links to each other with the 7-RXD0 of microprocessor IC3, and the electrical signal of Gbps serial receiver 7C2 links to each other with the 7-RXD1 of microprocessor IC3; CY7C68013 contains a USB communication interface, adopts USB cable to be connected between microprocessor IC3 and the computer 7D, realization high-speed data communications between the two.
Measuring principle:
The voltage of wide band high voltage intelligent resistance type voltage current combined sensor S1 and S2 and current measurement signal input link to each other with tested three-phase alternating current such as Fig. 6, S1 measures Uab and Ia, S2 measures Ucb and Ic, the sampling clock transmitter 7A1 of described S1, S2 and the electric signal input end of 7A2 link together, the sampling clock source that is S1, S2 is identical, the IC1 of the high-side signal processing unit (3) of S1, S2 carries out synchronized sampling to Uab, the Ucb of three-phase line voltage and Ia, the Ic of three-phase phase current respectively under the control in same sampling clock source.For each instantaneous value of same sampling instant, Uac=Uab-Ucb, Ia+Ib+Ic=0 are Ib=-(Ia+Ic), the IC3 of low-pressure side digital display terminal (7) obtains all instantaneous values of Uab, Ucb, Uac, Ia, Ib, Ic thus, again according to the calculating principle of effective value, calculate the effective value of Uab, Ucb, Uac, Ia, Ib, Ic, other as irregularity of wave form etc., measuring principle is identical.
The foregoing description is by the CMA of relevant department, and its measuring accuracy is better than 0.2 grade; Voltage follow-on test scope is 0～11kV, and short-time overload voltage reaches 14kV; The voltage signal bandwidth is DC～100kHz; Electric current follow-on test scope is 0～2000A, and the short-time overload electric current reaches 4000A; The current signal bandwidth is DC～100kHz; The highest sample frequency is 250kHz; Serial transmission speed is 2Mbps; Isolation voltage is not less than 20kV.
In the foregoing description,, and improve the dielectric voltage withstand of high voltage isolating transformer (5), can further improve test voltage if change the voltage ratio of resistance divider (1); If reduce the resistance value of shunt (2), can further improve measuring current.
Claims (8)
1. wide band high voltage intelligent resistance type voltage current combined sensor, it is characterized in that, constitute by following assembly: a resistance divider (1) that is used for taking out voltage signal from tested voltage circuit, a shunt (2) that is used for taking out the millivolt magnitude voltage signals from tested current circuit, analog voltage signal that is used for the output of resistance divider (1) and shunt (2) changes the digital signal high-side signal processing unit (3) that row operation handles of going forward side by side into, one group of communication optical fiber group (6) that connects high-side signal processing unit (3) and low-pressure side digital display terminal (7), one is the high-pressure side power supply (4) that high-side signal processing unit (3) provides working power, a high voltage isolating transformer (5) that connects high-pressure side power supply (4) and low-pressure side power supply grid.
2. wide band high voltage intelligent resistance type voltage current combined sensor according to claim 1, it is characterized in that described resistance divider (1) is made up of high-voltage arm resistance R 1 and low-voltage arm resistance R2, described R1 and R2 are noninductive resistance, and together are encapsulated in the shielded metal tube of insulating material embedding.
3. wide band high pressure intelligent resistance type current sensor according to claim 1 is characterized in that described shunt (2) selects flat shunt or folding belt shunt or Disc Shunt or coaxial-type shunt for use according to bandwidth requirement.
4. wide band high voltage intelligent resistance type voltage current combined sensor according to claim 1 is characterized in that the former limit of described high voltage isolating transformer (5) and secondary are connected with low-pressure side power supply grid and high-pressure side power supply (4) respectively.
5. wide band high voltage intelligent resistance type voltage current combined sensor according to claim 1 is characterized in that described high-side signal processing unit (3) is made up of signal amplification circuit 3D, AD converter IC1, microprocessor IC2, serial data transmitter 3C.
6. wide band high voltage intelligent resistance type voltage current combined sensor according to claim 5 is characterized in that described high-side signal processing unit (3) also comprises a kind of among sampling clock receiver 3A or the Gbps serial receiver 3B or their combination.
7. wide band high voltage intelligent resistance type voltage current combined sensor according to claim 1, it is characterized in that, described communication optical fiber group (6) is made up of at least one communication optical fiber 6C, and communication optical fiber 6C is connected with serial data transmitter 3C and low-pressure side digital display terminal (7) in the high-side signal processing unit (3).
8. wide band high voltage intelligent resistance type voltage current combined sensor according to claim 7, it is characterized in that, described communication optical fiber group (6) also comprises one or their combination among communication optical fiber 6A or the communication optical fiber 6B, wherein communication optical fiber 6A is connected with sampling clock receiver 3A and low-pressure side digital display terminal (7), and communication optical fiber 6B is connected with Gbps serial receiver 3B and low-pressure side digital display terminal (7).
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| CN200810030744A CN100585759C (en) | 2008-03-04 | 2008-03-04 | Wide band high voltage intelligent resistance type voltage current combined sensor |
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| CN200810030744A CN100585759C (en) | 2008-03-04 | 2008-03-04 | Wide band high voltage intelligent resistance type voltage current combined sensor |
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Cited By (7)
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| CN102023270A (en) * | 2010-11-22 | 2011-04-20 | 李颖 | Intelligent power network parameter sensor |
| CN102221413A (en) * | 2011-03-11 | 2011-10-19 | 厦门骐航实业有限公司 | Electronic current voltage combined type mutual inductor with temperature measuring apparatus |
| CN101846707B (en) * | 2010-02-04 | 2012-07-18 | 艾默生网络能源有限公司 | Equipment and method for riding through testing platform at low voltage on low-voltage side |
| CN102818925A (en) * | 2011-06-06 | 2012-12-12 | 李尔公司 | Isolated resistive current sensor |
| CN103245813A (en) * | 2013-03-28 | 2013-08-14 | 国家电网公司 | Comprehensive sensing and measuring device based on alloy resistance and implementation method thereof |
| CN106154130A (en) * | 2016-08-17 | 2016-11-23 | 山东理工大学 | A kind of photo-electric surge voltage test device and method |
| CN107884613A (en) * | 2017-11-03 | 2018-04-06 | 杭州柯林电气股份有限公司 | A kind of line voltage full frequency-domain monitoring device and method based on wideband wide range CT |
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- 2008-03-04 CN CN200810030744A patent/CN100585759C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101846707B (en) * | 2010-02-04 | 2012-07-18 | 艾默生网络能源有限公司 | Equipment and method for riding through testing platform at low voltage on low-voltage side |
| CN102023270A (en) * | 2010-11-22 | 2011-04-20 | 李颖 | Intelligent power network parameter sensor |
| CN102221413A (en) * | 2011-03-11 | 2011-10-19 | 厦门骐航实业有限公司 | Electronic current voltage combined type mutual inductor with temperature measuring apparatus |
| CN102818925A (en) * | 2011-06-06 | 2012-12-12 | 李尔公司 | Isolated resistive current sensor |
| US8836525B2 (en) | 2011-06-06 | 2014-09-16 | Lear Corporation | Isolated resistive current sensor |
| CN102818925B (en) * | 2011-06-06 | 2015-02-11 | 李尔公司 | Isolated resistive current sensor |
| CN103245813A (en) * | 2013-03-28 | 2013-08-14 | 国家电网公司 | Comprehensive sensing and measuring device based on alloy resistance and implementation method thereof |
| CN103245813B (en) * | 2013-03-28 | 2016-04-20 | 国家电网公司 | A kind of comprehensive sensing measuring apparatus based on resistance alloys and its implementation |
| CN106154130A (en) * | 2016-08-17 | 2016-11-23 | 山东理工大学 | A kind of photo-electric surge voltage test device and method |
| CN106154130B (en) * | 2016-08-17 | 2018-11-13 | 山东理工大学 | A kind of photo-electric surge voltage test device and method |
| CN107884613A (en) * | 2017-11-03 | 2018-04-06 | 杭州柯林电气股份有限公司 | A kind of line voltage full frequency-domain monitoring device and method based on wideband wide range CT |
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