CN102879758A - Standard source and detecting device both used for detecting harmonic influence quantity of electronic current transformer - Google Patents
Standard source and detecting device both used for detecting harmonic influence quantity of electronic current transformer Download PDFInfo
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- CN102879758A CN102879758A CN2012103504966A CN201210350496A CN102879758A CN 102879758 A CN102879758 A CN 102879758A CN 2012103504966 A CN2012103504966 A CN 2012103504966A CN 201210350496 A CN201210350496 A CN 201210350496A CN 102879758 A CN102879758 A CN 102879758A
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Abstract
The invention discloses a standard source and a detecting device both used for detecting the harmonic influence quantity of an electronic current transformer. The standard source comprises a fundamental harmonic generator used for providing voltage analog signals of a one-time side group harmonic wave shape of an analog power grid, and a standard source output module used for improving the analog accuracy of the voltage analog signals; and the standard source output module provides one-time side current analog signals with high analog accuracy of a power grid. The detecting device disclosed by the invention adopts the standard source, a current booster, a merging unit and an electronic transformer calibrator so as to detect the harmonic influence quantity of the electronic current transformer, and can directly use the output signals of the standard source as the comparison benchmark for the harmonic influence quantity, and the output signals of the standard source are compared with the output signals of the electronic current transformer so as to obtain the harmonic influence quantity of the electronic current transformer. The detecting device disclosed by the invention can simplify the detection on the harmonic influence quantity of the electronic current transformer.
Description
Technical field
The present invention relates to a kind of checkout equipment of electronic current mutual inductor harmonic effects amount, specifically a kind of standard source for the detection of electronic current mutual inductor harmonic effects amount, and the electronic current mutual inductor harmonic effects amount detecting device that adopts this standard source.
Background technology
In electric system, in order to guarantee the normal operation of electrical network, need to detect in real time parameters of electric power.Wherein the most important thing is voltage, electric current are measured.But day by day complicated along with consumer, the use amount of nonlinear load increases day by day in the electrical network, and the rising of the use amount of nonlinear load can cause the increase of harmonic content in the electrical network, and that is along with harmonic problem is day by day serious, and the accuracy meeting of electric energy metrical is produced very large impact.Being different metering and measuring equipments for the main cause of these impacts is not quite similar on the performance of the amount of impact of harmonic wave.Electronic mutual inductor is as the core component of new-generation digital transformer station electric energy metrical, it becomes the focus that people pay close attention in the situation that electrical network is rich in the accuracy of measurement of harmonic wave, therefore, electronic mutual inductor is carried out the test of harmonic effects amount, grasp its characteristic under different harmonic contents and have very important significance.
At present the main method for the detection of harmonic influence of electronic mutual inductor amount is to adopt the synthetic power supply of high-power principal wave harmonic wave, the harmonic standard current-voltage transformer, the normalized current voltage conversion device, electronic transducer calibration instrument forms, and the groundwork mode is to input the normalized current voltage conversion device after through the harmonic standard current-voltage transformer by the synthetic power supply output signal of harmonic wave first-harmonic to send into electronic transducer calibration instrument and compare again.Synthesizing power supply for principal wave harmonic wave in the prior art mainly is the sine wave of producing 50HZ by crystal oscillating circuit, then form a needed magnitude of voltage by power amplification circuit, be used for the test voltage mutual inductor, and the realization of electric current mainly is to obtain by voltage signal being carried out resistance sampling, the current signal precision that this kind mode obtains not high stability is not strong, the load capacity of output is limited, has certain limitation in test process.For the scheme that the high precision standard source is also arranged in the used standard source prior art of test, but the amplitude of the electric current and voltage of high precision standard source output is too small in the prior art, general voltage can only output to 380V, electric current is to 10A, general output power generally also only has tens volt-amperes, can't satisfy the test case with big capacity load, low voltage voltage that can only the simulating grid secondary side, the ruuning situation of electric current.And the harmonic wave of its output 21 subharmonic that generally can only be added to limited in one's ability, the precision of harmonic wave is not high yet.So it has some limitation of test equally in the power test process.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of standard source for the detection of electronic current mutual inductor harmonic effects amount is provided, it can provide the current analog signal of simulating grid primary side, and, a kind of pick-up unit that adopts this standard source is provided, simplifies the detection to electronic current mutual inductor harmonic effects amount.
The present invention solves the problems of the technologies described above the technological means that adopts:
A kind of standard source for the detection of electronic current mutual inductor harmonic effects amount, described standard source comprise be used to the principal wave harmonic wave generator of the voltage analog signal that simulating grid primary side fundamental waveform is provided with for the standard source output module that improves described voltage analog signal simulation precision; Described standard source output module comprises instrument operational amplification circuit, power amplification circuit, voltage follower and high precision shunt resistance; The voltage output end of described principal wave harmonic wave generator is connected to an end of high precision shunt resistance successively by instrument operational amplification circuit and power amplification circuit, the other end of high precision shunt resistance is the normalized current output terminal of standard source, described voltage follower is connected between the reference input of the normalized current output terminal of standard source and instrument amplifier amplifying circuit, described instrument operational amplification circuit converts the voltage analog signal that the principal wave harmonic wave generator provides to current analog signal, and after carrying out power amplification by power amplification circuit, export high-precision electrical network primary side current simulating signal at the normalized current output terminal of standard source.
As a kind of embodiment of invention, described instrument operational amplification circuit comprises instrumentation amplifier, the first balance resistance, the second balance resistance and enlargement factor regulating circuit; Described the first balance resistance is connected between the input pin of the same name of the input anode of instrument amplifier amplifying circuit and instrumentation amplifier, the second balance resistance is connected between the different name input pin of the input cathode of instrument operational amplification circuit and instrument operational amplification circuit, the enlargement factor regulating circuit is connected to two enlargement factors of instrumentation amplifier and regulates between the pin, the output pin of instrumentation amplifier is the output terminal of instrument amplifier amplifying circuit, and low reference pin connects the feedback input end of amplifying circuit.
As a kind of embodiment of invention, described enlargement factor regulating circuit comprises the first precision resister, regulating relay and the second precision resister; Described the first precision resister is connected to two enlargement factors of instrumentation amplifier and regulates between the pin, and described regulating relay and the second precision resister are in series, and this series arm and described the first precision resister are in parallel.
A kind of embodiment as invention, described voltage follower comprises high precision operating amplifier, the different name end of described high precision operating amplifier is connected with output terminal, the output terminal of described high precision operating amplifier is connected with the low reference pin of instrumentation amplifier, and input end of the same name is connected to the normalized current output terminal of standard source.
As a kind of embodiment of invention, described power amplification circuit comprises the first resistance, the second resistance, a NPN triode and a PNP triode; The emitter of a described NPN triode and a PNP triode is connected, the dc power supply positive pole is from the collector access of a NPN triode, the dc power supply negative pole is from the collector access of a PNP triode, the base stage of the one NPN triode is connected to the base stage of a PNP triode by the first resistance and the second resistance, the tie point of the first resistance and the second resistance is the input end of power amplification circuit, and the tie point of a NPN triode and a PNP triode is the output terminal of power amplification circuit.
As a kind of improvement to power amplification circuit, described power amplification circuit also comprises the 2nd NPN triode and the 2nd PNP triode; The emitter of described the 2nd NPN triode and the 2nd PNP triode is connected respectively to the output terminal of power amplification circuit, the dc power supply positive pole is from the collector access of the 2nd NPN triode, the dc power supply negative pole is from the collector access of the 2nd PNP triode, the 2nd NPN triode is connected with the base stage of a NPN triode, and the base stage of the 2nd PNP triode and a PNP triode is connected.
A kind of pick-up unit that detects for electronic current mutual inductor harmonic effects amount, described pick-up unit comprise each described standard source of above-mentioned each scheme, be used for connecting the primary side positive pole of electronic current mutual inductor primary side current input end to be measured is connected current lifting device, merge cells, electronic transducer calibration instrument and is used for connecting electronic current mutual inductor secondary side voltage output end to be measured with the primary side negative pole secondary side test side; Described current lifting device is connected between the normalized current output terminal and described primary side positive pole of standard source, the normalized current input anode of described electronic transducer calibration instrument is connected with described primary side negative pole, the normalized current input cathode is connected with holding of pick-up unit commonly, and tested input end is connected with described secondary side test side by merge cells.
Compared with prior art, the present invention has following beneficial effect:
First, standard source of the present invention adopts the principal wave harmonic wave generator that the voltage analog signal of simulating grid primary side fundamental waveform is provided, and by the standard source output module this voltage analog signal is processed, so that this signal converts power, electric current, voltage near the current signal of electrical network primary side characteristics of signals, namely this standard source provides the electrical network primary side current simulating signal of high simulation precision, has simulated the characteristic that is rich in harmonic wave, high-power, large electric current of electrical network actual waveform;
Second, standard source output module of the present invention adopts instrument amplifier amplifying circuit to convert voltage analog signal to current signal, and adopt voltage follower to feed back, so that the current analog signal that standard source provides has high precision and high stability, and selected precision resister in the circuit, help standard source that the long-time stability of signal are provided, improved the reliability of standard source as sensed signal sources; Standard source adopts triode that the signal of principal wave harmonic wave generator output is amplified, and stackable to surpassing 100 subharmonic, the precision of harmonic wave is high;
The 3rd, pick-up unit of the present invention has adopted standard source that the invention scheme provides as signal source, electronic current mutual inductor is carried out the harmonic effects amount to be detected, because standard source has high reliability, its output signal can directly provide benchmark for electronic transducer calibration instrument, electronic transducer calibration instrument compares by output signal and this benchmark with electronic current mutual inductor, can measure the harmonic effects amount of electronic current mutual inductor, by the computer control principal wave harmonic wave generator different overtone orders that superpose, can test drawing the characteristic of tested electronic mutual inductor under various harmonic wave input conditions simultaneously; Therefore, pick-up unit of the present invention has been simplified the detection to electronic current mutual inductor harmonic effects amount.
Description of drawings
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is the theory diagram of the preferred embodiment of the present invention;
Fig. 2 is the circuit theory diagrams of the preferred embodiment of the present invention.
Embodiment
As shown in Figure 1, the preferred embodiment of the present invention is used for the pick-up unit that electronic current mutual inductor harmonic effects amount detects, and comprises standard source, is used for connecting the anodal S11 of primary side of electronic current mutual inductor primary side current input end to be measured is connected current lifting device, merge cells, electronic transducer calibration instrument and is used for connecting electronic current mutual inductor secondary side voltage output end to be measured with primary side negative pole S12 secondary side test side S20; Current lifting device is connected between the normalized current output terminal IOUT+ and the anodal S11 of primary side of standard source, the normalized current input anode I+ of electronic transducer calibration instrument is connected with primary side negative pole S12, normalized current input cathode I-is connected with the GND that holds of pick-up unit commonly, and tested input end Vin is connected with secondary side test side S20 by merge cells.Wherein merge cells is selected model commonly used, and its effect is adaptive electronic current mutual inductor output terminal interface to be measured and the tested input end interface of electronic transducer calibration instrument.
As shown in Figure 2, the standard source of this preferred embodiment comprises be used to the principal wave harmonic wave generator of the voltage analog signal that simulating grid primary side fundamental waveform is provided with for the standard source output module that improves the voltage analog signal simulation precision; The standard source output module comprises instrument operational amplification circuit A1, power amplification circuit A2, voltage follower A3 and high precision shunt resistance R206; The voltage output end of principal wave harmonic wave generator is connected to the end of high precision shunt resistance R206 successively by instrument operational amplification circuit A1 and power amplification circuit A2, the other end of high precision shunt resistance R206 is the normalized current output terminal IOUT+ of standard source, voltage follower A3 is connected between the reference input of the normalized current output terminal of standard source and instrument amplifier amplifying circuit A1, instrument operational amplification circuit A1 converts the voltage analog signal that the principal wave harmonic wave generator provides to current analog signal, and after carrying out power amplification by power amplification circuit A2, export the electrical network primary side current simulating signal of high simulation precision at the normalized current output terminal IOUT+ of standard source.
Wherein, above-mentioned principal wave harmonic wave generator is selected existing generator, and it can provide degree of accuracy up to 0.02% small voltage signal, this voltage signal any subharmonic that can superpose, thereby the waveform of simulating grid.
Above-mentioned instrument operational amplification circuit A1 comprises instrumentation amplifier U209, the first balance resistance R203, the second balance resistance R204, the first precision resister R205, regulating relay S1 and the second precision resister R105; The first balance resistance R203 is connected between the input pin of the same name of the input anode of instrument amplifier amplifying circuit A1 and instrumentation amplifier U209, the second balance resistance R204 is connected between the different name input pin of the input cathode of instrument operational amplification circuit A1 and instrument operational amplification circuit A1, the first precision resister R205, regulating relay S1 and the second precision resister R105 form the enlargement factor regulating circuit, and instrumentation amplifier U209 changes enlargement factor by external enlargement factor regulating circuit; The first precision resister R205 is connected to two enlargement factors of instrumentation amplifier U209 and regulates between the pin, regulating relay S1 and the second precision resister R105 are in series, this series arm and the first precision resister R205 are in parallel, the output pin of instrumentation amplifier U209 is the output terminal of instrument amplifier amplifying circuit A1, and low reference pin REF connects the feedback input end of whole power amplification circuit A1.
Above-mentioned power amplification circuit A2 comprises the first resistance R 1, the second resistance R 2, a NPN triode Q1, a PNP triode Q2, the 2nd NPN triode Q3 and the 2nd PNP triode Q4; The emitter of the one NPN triode Q1 and a PNP triode Q2 is connected, the anodal V+ of dc power supply is from the collector access of a NPN triode Q1, dc power supply negative pole V-is from the collector access of a PNP triode Q2, the base stage of the one NPN triode Q1 is connected to the base stage of a PNP triode Q2 by the first resistance R 1 and the second resistance R 2, the emitter of the 2nd NPN triode Q3 and the 2nd PNP triode Q4 is connected respectively to the output terminal of power amplification circuit A2, the anodal V+ of dc power supply is from the collector access of the 2nd NPN triode Q3, dc power supply negative pole V-is from the collector access of the 2nd PNP triode Q4, the 2nd NPN triode Q3 is connected with the base stage of a NPN triode Q1, the base stage of the 2nd PNP triode Q4 and a PNP triode Q2 is connected, the tie point of the first resistance R 1 and the second resistance R 2 is the input end of power amplification circuit A2, and the tie point of a NPN triode Q1 and a PNP triode Q2 is the output terminal of power amplification circuit A2.
Above-mentioned voltage follower A3 comprises high precision operating amplifier UE3A, the different name end of high precision operating amplifier UE3A is connected with output terminal, the output terminal of high precision operating amplifier UE3A is connected with the low reference pin REF of instrumentation amplifier U209, and input end of the same name is connected to the normalized current output terminal of standard source.The effect of this voltage follower A3 is that standard source is sampled to the voltage signal of output, feeds back to the REF end of instrumentation amplifier U209, and only having feedback to reach the tension metrics source with input signal could stable operation.
Wherein, above-mentioned precision resister refers to the resistance of temperature coefficient below 1PPM commonly used.
The principle of work in this preferred embodiment Plays source is:
In this preferred embodiment, the principal wave harmonic wave generator can link to each other with computer by the RS232 interface, be controlled at the harmonic wave that superposes arbitrarily on the first-harmonic by computer, the waveform of complexity in the simulating grid, namely exported the voltage analog signal of simulating grid primary side fundamental waveform, according to principal wave harmonic wave generator commonly used is measured as can be known, this voltage analog signal degree of accuracy is up to 0.02%, but its power only has tens milliwatts, and alternating voltage can only change between 0-7V.
This voltage analog signal is input to the instrument amplifier by two balance resistance R203 and R204 with differential mode, precision resister R105 and R205 connect two enlargement factors of instrumentation amplifier U209 and regulate between the pin, namely between the 2nd, 3 pin, be used for adjusting the output enlargement factor of instrumentation amplifier U209, relay S1 is used for the control enlargement factor, enlargement factor is Gain=1+49.4K/RG, RG is 2 of amplifier, resistance above 3 pin, resistance adopts the high-precision and high-stability resistance of 1PPM, to guarantee the long-time stability of output.6 pin of instrument amplifier are that REF is with reference to pin, for receiving feedback signals.
Because the output current of instrument amplifier is smaller, so will finally obtain large electric current must amplify the little electric current of instrument amplifier output, here adopt the high-power NPN of 2000W and PNP to pipe 3CF200,3DF200, as current amplifier tube, resistance R 1 and resistance R 2 are the current-limiting resistance to pipe, for the electric current that makes output enough large, here adopt 2 pairs high-power pipe to be increased output current, the signal of triode output is through a high-precision high-power shunt R206, be converted to the current signal of final output, the current amplitude of final output is I=UOUT/R206.The output terminal of triode is done the signal feedback exported behind the voltage follow to the reference edge of instrument amplifier by a high-operational amplifier, make the output that final whole system can be stable.So, the standard source in this preferred embodiment provides the electrical network primary side current simulating signal of high simulation precision, has namely simulated the characteristic that is rich in harmonic wave, high-power, large electric current of electrical network actual waveform.
The principle of work of this preferred embodiment pick-up unit is:
Electronic current mutual inductor to be measured is accessed in the pick-up unit of this preferred embodiment, the primary side input end that is electronic current mutual inductor is connected with primary side negative pole S12 with the anodal S11 of primary side respectively, the secondary side output terminal is connected with secondary side test side S20, standard source is exported the electrical network primary side current simulating signal of high simulation precision, this current analog signal flows through current lifting device successively, the primary side of electronic current mutual inductor, normalized current input anode I+ input from electronic transducer calibration instrument, hold GND from what its normalized current input cathode I-output flow into pick-up unit at last commonly, this process provides electrical network primary side analog current signal for electronic current mutual inductor to be measured on the one hand, electronic transducer calibration instrument has gathered the information of this analog current on the other hand, as the basis that electronic current mutual inductor harmonic effects amount to be measured is detected; Secondary side at electronic current mutual inductor to be measured, the voltage signal of the secondary side voltage output end output of electronic current mutual inductor is inputted electronic transducer calibration instrument through merge cells from secondary side test side S20, the information that the signal that electronic transducer calibration instrument is received the standard input termination and tested termination are received compares, can draw some characterisitic parameters of electronic current mutual inductor, by the computer control principal wave harmonic wave generator different overtone orders that superpose, can test drawing the characteristic of tested electronic mutual inductor under various harmonic wave input conditions simultaneously.
Standard source in this preferred embodiment also can offer other various electronic equipments of electric grid secondary side as the output of an analog waveform of electrical network, and the producer of the electrogenesis power of making a living secondary side product provides the experiment test means.
Embodiments of the present invention are not limited to this, according to foregoing, ordinary skill knowledge and customary means according to this area, do not breaking away under the above-mentioned basic fundamental thought of the present invention prerequisite, the present invention can also make the equivalent modifications of other various ways, replace or change, for example: also can be on precision resister R205 in the above preferred embodiment series arm that forms of a plurality of relay in parallel and precision resister again, to increase the amplification range of instrumentation amplifier U209, perhaps directly realize the high precision impedance adjustment circuit with high precision regulating resistor commonly used, all can realize the object of the invention.
Claims (7)
1. one kind is used for the standard source that electronic current mutual inductor harmonic effects amount detects, and it is characterized in that: described standard source comprises be used to the principal wave harmonic wave generator of the voltage analog signal that simulating grid primary side fundamental waveform is provided with for the standard source output module that improves described voltage analog signal simulation precision; Described standard source output module comprises instrument amplifier amplifying circuit (A1), power amplification circuit (A2), voltage follower (A3) and high precision shunt resistance (R206); The voltage output end of described principal wave harmonic wave generator is connected to an end of high precision shunt resistance (R206) successively by instrument amplifier amplifying circuit (A1) and power amplification circuit (A2), the other end of high precision shunt resistance (R206) is the normalized current output terminal (IOUT+) of standard source, described voltage follower (A3) is connected between the reference input of the normalized current output terminal of standard source and instrument amplifier amplifying circuit (A1), described instrument amplifier amplifying circuit (A1) converts the voltage analog signal that the principal wave harmonic wave generator provides to current analog signal, and after carrying out power amplification by power amplification circuit (A2), in the high-precision electrical network primary side current simulating signal of normalized current output terminal (IOUT+) output of standard source.
2. the standard source that detects for electronic current mutual inductor harmonic effects amount according to claim 1, it is characterized in that: described instrument amplifier amplifying circuit (A1) comprises instrumentation amplifier (U209), the first balance resistance (R203), the second balance resistance (R204) and enlargement factor regulating circuit; Described the first balance resistance (R203) is connected between the input pin of the same name of the input anode of instrument amplifier amplifying circuit (A1) and instrumentation amplifier (U209), the second balance resistance (R204) is connected between the different name input pin of the input cathode of instrument amplifier amplifying circuit (A1) and instrument amplifier amplifying circuit (A1), the enlargement factor regulating circuit is connected to two enlargement factors of instrumentation amplifier (U209) and regulates between the pin, the output pin of instrumentation amplifier (U209) is the output terminal of instrument amplifier amplifying circuit (A1), and low reference pin (REF) is the feedback input end of instrument amplifier amplifying circuit (A1).
3. the standard source that detects for electronic current mutual inductor harmonic effects amount according to claim 2, it is characterized in that: described enlargement factor regulating circuit comprises the first precision resister (R205), regulating relay (S1) and the second precision resister (R105); Described the first precision resister (R205) is connected to two enlargement factors of instrumentation amplifier (U209) and regulates between the pin, described regulating relay (S1) and the second precision resister (R105) are in series, and this series arm and described the first precision resister (R205) are in parallel.
4. the standard source that detects for electronic current mutual inductor harmonic effects amount according to claim 3, it is characterized in that: described voltage follower (A3) comprises high precision operating amplifier (C202), the different name end of described high precision operating amplifier (C202) is connected with output terminal, the output terminal of described high precision operating amplifier (C202) is connected with the low reference pin (REF) of instrumentation amplifier (U209), and input end of the same name is connected to the normalized current output terminal of standard source.
5. according to claim 1 to 4 each described standard sources for the detection of electronic current mutual inductor harmonic effects amount, it is characterized in that: described power amplification circuit (A2) comprises the first resistance (R1), the second resistance (R2), a NPN triode (Q1) and a PNP triode (Q2); The emitter of a described NPN triode (Q1) and a PNP triode (Q2) is connected, dc power supply anodal (V+) is from the collector access of a NPN triode (Q1), dc power supply negative pole (V-) is from the collector access of a PNP triode (Q2), the base stage of the one NPN triode (Q1) is connected to the base stage of a PNP triode (Q2) by the first resistance (R1) and the second resistance (R2), the tie point of the first resistance (R1) and the second resistance (R2) is the input end of power amplification circuit (A2), and the tie point of a NPN triode (Q1) and a PNP triode (Q2) is the output terminal of power amplification circuit (A2).
6. the standard source that detects for electronic current mutual inductor harmonic effects amount according to claim 5, it is characterized in that: described power amplification circuit (A2) also comprises the 2nd NPN triode (Q3) and the 2nd PNP triode (Q4); The emitter of described the 2nd NPN triode (Q3) and the 2nd PNP triode (Q4) is connected respectively to the output terminal of power amplification circuit (A2), dc power supply anodal (V+) is from the collector access of the 2nd NPN triode (Q3), dc power supply negative pole (V-) is from the collector access of the 2nd PNP triode (Q4), the 2nd NPN triode (Q3) is connected with the base stage of a NPN triode (Q1), and the base stage of the 2nd PNP triode (Q4) and a PNP triode (Q2) is connected.
7. one kind is used for the pick-up unit that electronic current mutual inductor harmonic effects amount detects, and it is characterized in that: the primary side anodal (S11) that described pick-up unit comprises each described standard source of claim 1 to 6, be used for connecting electronic current mutual inductor primary side current input end to be measured is connected S12 with the primary side negative pole), current lifting device, merge cells, electronic transducer calibration instrument and for the secondary side test side (S20) that connects electronic current mutual inductor secondary side voltage output end to be measured; Described current lifting device is connected between the normalized current output terminal (IOUT+) and described primary side anodal (S11) of standard source, the normalized current input anode (I+) of described electronic transducer calibration instrument is connected with described primary side negative pole (S12), normalized current input cathode (I-) is connected with the common location (GND) of pick-up unit, and the tested input end (Vin) of electronic transducer calibration instrument is connected with described secondary side test side (S20) by merge cells.
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| CN104820199A (en) * | 2015-04-13 | 2015-08-05 | 广东电网有限责任公司电力科学研究院 | DC large-current measuring device ripple responsiveness test system and method thereof |
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| CN103605038A (en) * | 2013-12-06 | 2014-02-26 | 国家电网公司 | Protective error detecting and verifying system of electronic current transformer |
| CN103969524A (en) * | 2014-04-18 | 2014-08-06 | 国家电网公司 | Intelligent scanning electronic transformer combination unit characteristic testing method based on feedback |
| CN103969524B (en) * | 2014-04-18 | 2016-11-02 | 国家电网公司 | Intelligent scanning merging unit of electronic transformer characteristic test method based on feedback |
| CN104820199A (en) * | 2015-04-13 | 2015-08-05 | 广东电网有限责任公司电力科学研究院 | DC large-current measuring device ripple responsiveness test system and method thereof |
| CN105629192A (en) * | 2016-03-14 | 2016-06-01 | 国家电网公司 | Zero-flux current transformer calibration device and method |
| CN106054102A (en) * | 2016-08-11 | 2016-10-26 | 国网浙江省电力公司电力科学研究院 | Current-transformer harmonic wave error measurement system |
| CN106054102B (en) * | 2016-08-11 | 2019-10-11 | 国网浙江省电力公司电力科学研究院 | A kind of current transformer harmonic error measuring system |
| CN107564432A (en) * | 2017-08-16 | 2018-01-09 | 杭州鸟人光电科技有限公司 | Programmable image demonstrating apparatus |
| CN108919163A (en) * | 2018-05-25 | 2018-11-30 | 云南电网有限责任公司电力科学研究院 | Electronic current mutual inductor harmonic wave and frequency aliasing characteristic test system and its model |
| CN109085529A (en) * | 2018-10-16 | 2018-12-25 | 国家电网有限公司 | A kind of composition error detection platform emulating pulse conversion station harmonic signal |
| CN111487576A (en) * | 2020-04-30 | 2020-08-04 | 浙江省方正校准有限公司 | Miniature current transformer measuring device based on direct measurement method |
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