CN105223530A - High frequency partial discharge detector verification system and calibration method thereof - Google Patents
High frequency partial discharge detector verification system and calibration method thereof Download PDFInfo
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Abstract
The invention discloses a kind of high frequency partial discharge detector verification system and calibration method thereof, system comprises FMAM signal generator, power current generator, Bureau of Standards's discharge signal generator, Signal-regulated kinase, concentric cable, matched impedance, oscillograph and centralized control unit; Calibration method comprises carries out the steps such as saturation characteristic calibrating to high frequency partial discharge detector.FMAM signal generator amplitude of the present invention and frequency adjustment are conveniently, the performance detecting requirement of high frequency partial discharge detector and High Frequency Current Sensor thereof can be met, the qualification problem of solution high frequency partial discharge detector that can be effective, unified and High Frequency Current Sensor thereof, conveniently realize the periodic inspection of high frequency partial discharge detector, guarantee the superperformance of high frequency partial discharge detector, effectively can reflect the running status of electrical equipment, have testing result accurately and reliably, be easy to realize advantage.
Description
Technical field
The present invention relates to electric power project engineering field, be specifically related to a kind of high frequency partial discharge detector verification system and calibration method thereof, for carrying out performance detecting to high frequency partial discharge detector (HFCT).
Background technology
Along with the fast development of China's economy, the requirement of every profession and trade to the reliability and stability of mains supply is more and more higher, the power failure test number (TN) of power equipment also will reduce thereupon, and live detection progressively will replace the test that has a power failure, and become one of Main Means obtaining status of electric power information.When electrical equipment generation shelf depreciation, the high-frequency pulse current of frequency 3MHz-30MHz can be produced, and propagate along the metal parts of electrical equipment, and enter ground by ground wire, utilize High Frequency Current Sensor (HFCT) that this signal can be detected, this sensor can be used for the micro-current signal of survey frequency between tens kHz to 30MHz, and current signal is converted into voltage signal, for reflecting the degree of shelf depreciation.High frequency partial discharge band electro-detection is as the important means detecting electrical equipment health status, vital role has been played in the electrical equipment malfunctions such as transformer, cable and lightning arrester detect, along with the application of high frequency partial discharge examination increases gradually, the performance of high frequency partial discharge detector (HFCT) also causes the attention of people.But still lack about effective, the unified method of sensor performance calibrating is put in high frequency office at present, cause high frequency office to put live detection instrument and in use all do not carry out periodic detection, instrument performance and measuring accuracy all cannot obtain effective guarantee, cause the result difference of the different instrument test of rig-site utilization larger, confidence level is not high, and test result cannot reflect the running status of the electrical equipments such as transformer, cable and lightning arrester effectively, really.For solving the problem, be necessary a set of effective, the unified high frequency partial discharge examination sensor verification system of research and method, cannot periodic inspection problem to solve high frequency partial discharge detector (HFCT) performance, guarantee the superperformance that instrument detects, thus ensure that the testing result of high frequency partial discharge detector (HFCT) can reflect the running status of electrical equipment accurately and efficiently.
Summary of the invention
The technical problem to be solved in the present invention is: for the problems referred to above of prior art, a kind of performance detecting requirement that can meet high frequency partial discharge detector and High Frequency Current Sensor thereof is provided, can be effective, unified solution high frequency partial discharge detector and the qualification problem of High Frequency Current Sensor thereof, conveniently realize the periodic inspection of high frequency partial discharge detector, guarantee the superperformance of high frequency partial discharge detector, effectively can reflect the running status of electrical equipment, testing result accurately and reliably, be easy to high frequency partial discharge detector verification system and the calibration method thereof of realization.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
The invention provides a kind of high frequency partial discharge detector verification system, comprise FMAM signal generator, power current generator, Bureau of Standards's discharge signal generator, Signal-regulated kinase, concentric cable, matched impedance, oscillograph and centralized control unit, the output terminal of described FMAM signal generator, the output terminal of Bureau of Standards's discharge signal generator is connected with the input end of Signal-regulated kinase respectively, and the output terminal of described Signal-regulated kinase passes through concentric cable successively, matched impedance ground connection, the High Frequency Current Sensor of accredited high frequency partial discharge detector is sheathed on the earthing cable of matched impedance simultaneously, on the output cable of power current generator, a described oscillographic road detection terminal is connected with the front end of matched impedance, another road detection terminal is connected with the output terminal of High Frequency Current Sensor, and described oscillographic output terminal is connected with centralized control unit, described centralized control unit respectively with FMAM signal generator, power current generator, the control end of Bureau of Standards's discharge signal generator is connected.
Preferably, described Signal-regulated kinase comprises channel switching circuit, impedance inverter circuit, signal amplification circuit, noise-removed filtering circuit and gain adjusting circuit, the output terminal of described FMAM signal generator, the output terminal of Bureau of Standards's discharge signal generator are connected with the input end of channel switching circuit respectively, the output terminal of described channel switching circuit is connected with the input end of gain adjusting circuit by impedance inverter circuit, signal amplification circuit, noise-removed filtering circuit successively, and the output terminal of described gain adjusting circuit is successively by concentric cable, matched impedance ground connection.
Preferably, described centralized control unit is also connected with display unit and man-machine interface.
The present invention also provides a kind of calibration method of high frequency partial discharge detector verification system, and comprise the step of High Frequency Current Sensor being carried out to saturation characteristic calibrating, detailed step comprises:
1.1) High Frequency Current Sensor to be examined and determine is arranged in connection, and is connected with high frequency partial discharge detector by the output terminal of High Frequency Current Sensor;
1.2) the Partial discharge signal generator that maintains the standard cuts out, and opens FMAM signal generator, and adjustment FMAM signal generator output frequency is 10MHz, peak value is the sinusoidal signal of 1V and remains unchanged;
1.3) open power current generator and start from scratch and increase output current gradually, the output voltage amplitude of the High Frequency Current Sensor that the current value of record power current generator and high frequency partial discharge detector detect, when the output voltage amplitude of High Frequency Current Sensor is reduced to 1/2 of open width value, record the actual measurement power frequency saturation current I of current value as High Frequency Current Sensor of now power current generator, and calculate the saturation current value error of High Frequency Current Sensor according to formula (1);
In formula (1), △ I is the saturation current value error of High Frequency Current Sensor, and I is the actual measurement power frequency saturation current of High Frequency Current Sensor, I
gfor the nominal power frequency saturation current value of High Frequency Current Sensor.
Preferably, the method also comprises the step of High Frequency Current Sensor being carried out to amplitude versus frequency characte calibrating, and detailed step comprises:
2.1) High Frequency Current Sensor to be examined and determine is arranged in connection;
2.2) keep power current generator and Bureau of Standards's discharge signal generator to close, open FMAM signal generator, regulate FMAM signal generator output signal peak value be the sinusoidal signal of 1V and remain unchanged;
2.3) within the scope of 100kHz ~ 50MHz, progressively regulate the output signal frequency of FMAM signal generator, and in 100kHz ~ 1MHz frequency range, detect step-length be that to detect step-length in 100kHz, 1MHz ~ 50MHz frequency range be 1MHz; In the process regulating FMAM signal generator output signal frequency, the output voltage amplitude of the High Frequency Current Sensor that the frequency of record FMAM signal generator output signal and oscillograph export;
2.4) output voltage amplitude of the High Frequency Current Sensor that the frequency outputed signal according to FMAM signal generator by centralized control unit and oscillograph are exported draws out the amplitude-versus-frequency curve of High Frequency Current Sensor at 100kHz ~ 50MHz.
Preferably, the method also comprises the step of High Frequency Current Sensor being carried out to transfer impedance calibrating, and detailed step comprises:
3.1) High Frequency Current Sensor to be examined and determine is arranged in connection;
3.2) keep power current generator and Bureau of Standards's discharge signal generator to close, open FMAM signal generator, peak value is 1V, signal frequency is the sinusoidal signal of 10MHz and remains unchanged to regulate FMAM signal generator to output signal;
3.3) by the front voltage U of oscillograph difference record matching impedance
1with the output voltage U of High Frequency Current Sensor
2;
3.4) centralized control unit calculates the transfer impedance of High Frequency Current Sensor according to formula (2);
In formula (2), Z is the transfer impedance of High Frequency Current Sensor, U
1for the front voltage of matched impedance, U
2for the output voltage of High Frequency Current Sensor.
Preferably, the method also comprises the step of High Frequency Current Sensor being carried out to measurement bandwidth calibrating, and detailed step comprises:
4.1) High Frequency Current Sensor to be examined and determine is arranged in connection;
4.2) keep power current generator and Bureau of Standards's discharge signal generator to close, open FMAM signal generator, regulate FMAM signal generator output signal peak value be the sinusoidal signal of 1V and remain unchanged;
4.3) within the scope of 100kHz ~ 50MHz, progressively regulate the output signal frequency of FMAM signal generator, and in 100kHz ~ 1MHz frequency range, detect step-length be that to detect step-length in 100kHz, 1MHz ~ 50MHz frequency range be 1MHz; In the process regulating FMAM signal generator output signal frequency, the output voltage amplitude of the High Frequency Current Sensor that the frequency of record FMAM signal generator output signal and oscillograph gather;
4.4) measurement bandwidth curve is drawn out according to the frequency of FMAM signal generator output signal and the output voltage amplitude of High Frequency Current Sensor, the upper lower limiting frequency of FMAM signal generator output signal when the output voltage amplitude finding out High Frequency Current Sensor drops to 0.5 times of maximal value from maximal value, thus obtain the upper lower limiting frequency of High Frequency Current Sensor measurement bandwidth.
Preferably, the method also comprises the step of high frequency partial discharge detector being carried out to linearity calibrating, and detailed step comprises:
5.1) high frequency partial discharge detector to be examined and determine and High Frequency Current Sensor thereof are arranged in connection;
5.2) power current generator and Bureau of Standards's discharge signal generator is kept to close; Open FMAM signal generator, FMAM signal generator is regulated to export the sinusoidal signal of a certain assigned frequency between 3MHz ~ 30MHz, and regulate the amplitude of FMAM signal generator output signal to make high frequency partial discharge detector reach full scale, record the crest voltage U that now FMAM signal generator exports
mwith the full scale amplitude A of high frequency partial discharge detector
m;
5.3) amplitude of FMAM signal generator output signal is reduced successively to λ U
m, wherein parameter lambda be respectively be less than 1 and be greater than 0 one group of decreasing values, the amplitude A that under record different parameters λ, high frequency partial discharge detector exports
λ;
5.4) centralized control unit is according to the linearity error of formulae discovery high frequency partial discharge detector at different parameters λ value measurement point:
In formula (3), ε is the linearity error of high frequency partial discharge detector at some parameter lambda value measurement points, A
λfor the amplitude that high frequency partial discharge detector under this parameter lambda value exports, A
mfor the full scale amplitude of high frequency partial discharge detector.
Preferably, the method comprises the step of high frequency partial discharge detector being carried out to sensitivity calibrating, and detailed step comprises:
6.1) high frequency partial discharge detector to be examined and determine and High Frequency Current Sensor thereof are arranged in connection;
6.2) FMAM signal generator and power current generator is kept to close; Open Bureau of Standards's discharge signal generator, the output signal amplitude of control criterion Partial discharge signal generator is 0, by the initial output voltage amplitude A1 of high frequency partial discharge detector record now High Frequency Current Sensor;
6.3) start from scratch and progressively increase the output signal amplitude of Bureau of Standards discharge signal generator, and by the current output voltage amplitude A2 of high frequency partial discharge detector record now High Frequency Current Sensor; When meeting current output voltage amplitude A2 and exceeding the twice of initial output voltage amplitude A1, record the output signal amplitude Q of now Bureau of Standards's discharge signal generator, this output signal amplitude Q is the sensitivity of high frequency partial discharge detector.
High frequency partial discharge detector verification system of the present invention has following advantage: high frequency partial discharge detector verification system of the present invention comprises FMAM signal generator, power current generator, Bureau of Standards's discharge signal generator, Signal-regulated kinase, concentric cable, matched impedance, oscillograph and centralized control unit, can realize the saturation characteristic of high frequency partial discharge detector High Frequency Current Sensor, amplitude versus frequency characte, transfer impedance, the linearity of measurement bandwidth and high frequency partial discharge detector, the calibrating of the performances such as sensitivity, FMAM signal generator amplitude and frequency adjustment conveniently, can meet the calibrating requirement of high frequency partial discharge detector and High Frequency Current Sensor thereof, can be effective, unified solution high frequency partial discharge detector and the qualification problem of High Frequency Current Sensor thereof, conveniently realize the periodic inspection of high frequency partial discharge detector, guarantee the superperformance of high frequency partial discharge detector, effectively can reflect the running status of electrical equipment, there is testing result accurately and reliably, be easy to the advantage realized.
The calibration method of high frequency partial discharge detector verification system of the present invention is that high frequency partial discharge detector verification system of the present invention is for comprising the calibrating of the performance of saturation characteristic, equally also can be effective, unified solution high frequency partial discharge detector and High Frequency Current Sensor thereof comprise the qualification problem of saturation characteristic, conveniently realize the periodic inspection of high frequency partial discharge detector, guarantee the superperformance of high frequency partial discharge detector, effectively can reflect the running status of electrical equipment, there is testing result accurately and reliably, be easy to the advantage realized.
Accompanying drawing explanation
Fig. 1 is the framed structure schematic diagram of embodiment of the present invention system.
Fig. 2 is the measurement bandwidth curve that embodiment of the present invention system is drawn out.
Embodiment
As shown in Figure 1, the high frequency partial discharge detector verification system of the present embodiment comprises FMAM signal generator 1, power current generator 2, Bureau of Standards's discharge signal generator 3, Signal-regulated kinase 4, concentric cable 5, matched impedance 6, oscillograph 7 and centralized control unit 8, the output terminal of FMAM signal generator 1, the output terminal of Bureau of Standards's discharge signal generator 3 is connected with the input end of Signal-regulated kinase 4 respectively, and the output terminal of Signal-regulated kinase 4 is successively by concentric cable 5, matched impedance 6 ground connection, the High Frequency Current Sensor 110 of accredited high frequency partial discharge detector 11 is sheathed on the earthing cable of matched impedance 6 simultaneously, on the output cable of power current generator 2, a road detection terminal of oscillograph 7 is connected with the front end of matched impedance 6, another road detection terminal is connected with the output terminal of High Frequency Current Sensor 110, and the output terminal of oscillograph 7 is connected with centralized control unit 8, centralized control unit 8 respectively with FMAM signal generator 1, power current generator 2, the control end of Bureau of Standards's discharge signal generator 3 is connected.Based on said structure, the high frequency partial discharge detector verification system of the present embodiment can realize the saturation characteristic of High Frequency Current Sensor 110, amplitude versus frequency characte, transfer impedance, the linearity of measurement bandwidth and high frequency partial discharge detector 11, any one or calibrating that is multiple and other performances in sensitivity, can be effective, unified solution high frequency partial discharge detector 11 and the qualification problem of High Frequency Current Sensor 110 thereof, conveniently realize the periodic inspection of high frequency partial discharge detector 11, guarantee the superperformance of high frequency partial discharge detector 11, effectively can reflect the running status of electrical equipment, there is testing result accurately and reliably, be easy to the advantage realized.
In the present embodiment, FMAM signal generator 1, for examining and determine the sensitivity and stability etc. of the amplitude versus frequency characte of High Frequency Current Sensor 110, transfer impedance, measurement bandwidth, the linearity and high frequency partial discharge detector 11, can provide the high-frequency signal that 0 ~ 50MHz amplitude is adjustable; Power current generator 2 is mainly used in the saturation characteristic of examining and determine high frequency partial discharge detector 11, can provide the power frequency 50Hz electric current of 0 ~ 50A; Bureau of Standards's discharge signal generator 3 can provide the Partial discharge signal of 0 ~ 500pC, and impulse source is put in the concrete Hangzhou West Lake Electronics Co., Ltd. HD type Bureau of Standards that adopts.In the present embodiment, Signal-regulated kinase 4 comprises channel switching circuit, impedance inverter circuit, signal amplification circuit, noise-removed filtering circuit and gain adjusting circuit, the output terminal of FMAM signal generator 1, the output terminal of Bureau of Standards's discharge signal generator 3 is connected with the input end of channel switching circuit respectively, the output terminal of channel switching circuit passes through impedance inverter circuit successively, signal amplification circuit, noise-removed filtering circuit is connected with the input end of gain adjusting circuit, the output terminal of gain adjusting circuit is successively by concentric cable 5, matched impedance 6 ground connection, due to channel switching circuit, impedance inverter circuit, signal amplification circuit, noise-removed filtering circuit and gain adjusting circuit are common available circuit, therefore its particular circuit configurations no longer launches explanation in the present embodiment.Concentric cable 5 is for signal transmission; Matched impedance 6, for matching coaxial cable impedance, reduces setback reflection, generally with 50 Ω resistance; Oscillograph 7 is for showing the signal of test; Centralized control unit 8 is for the various functions of control verification system.
Shown in Fig. 1, the centralized control unit 8 of the present embodiment is also connected with display unit 9 and man-machine interface 10, and display unit 9 is for display amplitude and frequency, and man-machine interface 10 is for operating instrument.In addition, centralized control unit 8 can also pass through the mode such as remote network communication, local memory interface, realize the Long-distance Control to the calibrating of high frequency partial discharge detector and exchanges data, local automatic control and data storage etc., it is identical with the present embodiment that it examines and determine principle substantially, therefore do not repeat them here.
The present embodiment high frequency partial discharge detector verification system can realize the calibrating of the performance such as the linearity, sensitivity of the saturation characteristic of High Frequency Current Sensor 110, amplitude versus frequency characte, transfer impedance, measurement bandwidth and high frequency partial discharge detector 11.The calibration method of the present embodiment high frequency partial discharge detector verification system comprises the step of High Frequency Current Sensor 110 being carried out to saturation characteristic calibrating, and detailed step comprises:
1.1) High Frequency Current Sensor 110 to be examined and determine is arranged in connection, and is connected with high frequency partial discharge detector 11 by the output terminal of High Frequency Current Sensor 110;
1.2) the Partial discharge signal generator 3 that maintains the standard cuts out, and opens FMAM signal generator 1, and adjustment FMAM signal generator 1 output frequency is 10MHz, peak value is the sinusoidal signal of 1V and remains unchanged;
1.3) open power current generator 2 and start from scratch and increase output current gradually, the output voltage amplitude of the High Frequency Current Sensor 110 that the current value of record power current generator 2 and high frequency partial discharge detector 11 detect, when the output voltage amplitude of High Frequency Current Sensor 110 is reduced to 1/2 of open width value, record the actual measurement power frequency saturation current I of current value as High Frequency Current Sensor 110 of now power current generator 2, and calculate the saturation current value error of High Frequency Current Sensor 110 according to formula (1);
In formula (1), △ I is the saturation current value error of High Frequency Current Sensor 110, and I is the actual measurement power frequency saturation current of High Frequency Current Sensor 110, I
gfor the nominal power frequency saturation current value of High Frequency Current Sensor 110.Generally speaking, the saturation current value error delta I of High Frequency Current Sensor 110 should not be greater than ± 10%.
The calibration method of the present embodiment high frequency partial discharge detector verification system also comprises the step of High Frequency Current Sensor 110 being carried out to amplitude versus frequency characte calibrating, and detailed step comprises:
2.1) High Frequency Current Sensor 110 to be examined and determine is arranged in connection;
2.2) keep power current generator 2 and Bureau of Standards's discharge signal generator 3 to close, open FMAM signal generator 1, regulate FMAM signal generator 1 to output signal sinusoidal signal that peak value is 1V also remains unchanged;
2.3) within the scope of 100kHz ~ 50MHz, progressively regulate the output signal frequency of FMAM signal generator 1, and in 100kHz ~ 1MHz frequency range, detect step-length be that to detect step-length in 100kHz, 1MHz ~ 50MHz frequency range be 1MHz; In the process regulating FMAM signal generator 1 output signal frequency, the output voltage amplitude of the frequency that record FMAM signal generator 1 outputs signal and the High Frequency Current Sensor 110 that oscillograph 7 exports;
2.4) output voltage amplitude of the High Frequency Current Sensor 110 that the frequency outputed signal according to FMAM signal generator 1 by centralized control unit 8 and oscillograph 7 are exported draws out the amplitude-versus-frequency curve of High Frequency Current Sensor 110 at 100kHz ~ 50MHz.Generally speaking, the amplitude versus frequency characte of High Frequency Current Sensor 110 and the error requirements of product description be no more than ± 10%.
The calibration method of the present embodiment high frequency partial discharge detector verification system also comprises the step of High Frequency Current Sensor 110 being carried out to transfer impedance calibrating, and detailed step comprises:
3.1) High Frequency Current Sensor 110 to be examined and determine is arranged in connection;
3.2) keep power current generator 2 and Bureau of Standards's discharge signal generator 3 to close, open FMAM signal generator 1, peak value is 1V, signal frequency is the sinusoidal signal of 10MHz and remains unchanged to regulate FMAM signal generator 1 to output signal;
3.3) by the front voltage U of oscillograph 7 difference record matching impedance 6
1with the output voltage U of High Frequency Current Sensor 110
2;
3.4) centralized control unit 8 calculates the transfer impedance of High Frequency Current Sensor 110 according to formula (2);
In formula (2), Z is the transfer impedance of High Frequency Current Sensor 110, U
1for the front voltage of matched impedance 6, U
2for the output voltage of High Frequency Current Sensor 110.Generally speaking, the transfer impedance of High Frequency Current Sensor 110 is greater than 5mV/mA.
The calibration method of the present embodiment high frequency partial discharge detector verification system also comprises the step of High Frequency Current Sensor 110 being carried out to measurement bandwidth calibrating, and detailed step comprises:
4.1) High Frequency Current Sensor 110 to be examined and determine is arranged in connection;
4.2) keep power current generator 2 and Bureau of Standards's discharge signal generator 3 to close, open FMAM signal generator 1, regulate FMAM signal generator 1 to output signal sinusoidal signal that peak value is 1V also remains unchanged;
4.3) within the scope of 100kHz ~ 50MHz, progressively regulate the output signal frequency of FMAM signal generator 1, and in 100kHz ~ 1MHz frequency range, detect step-length be that to detect step-length in 100kHz, 1MHz ~ 50MHz frequency range be 1MHz; In the process regulating FMAM signal generator 1 output signal frequency, the output voltage amplitude of the frequency that record FMAM signal generator 1 outputs signal and the High Frequency Current Sensor 110 that oscillograph 7 gathers;
4.4) measurement bandwidth curve is drawn out according to the frequency of FMAM signal generator 1 output signal and the output voltage amplitude of High Frequency Current Sensor 110, as shown in Figure 2, the upper lower limiting frequency that when output voltage amplitude finding out High Frequency Current Sensor 110 drops to 0.5 times (-6dB) of maximal value from maximal value, FMAM signal generator 1 outputs signal, thus obtain the upper lower limiting frequency f of High Frequency Current Sensor 110 measurement bandwidth
1and f
2.Generally speaking, the measurement bandwidth of High Frequency Current Sensor 110 between 3M ~ 30MHz, and and the setting error of product export instructions be no more than ± 10%.
The calibration method of the present embodiment high frequency partial discharge detector verification system also comprises the step of high frequency partial discharge detector 11 being carried out to linearity calibrating, and detailed step comprises:
5.1) high frequency partial discharge detector 11 to be examined and determine and High Frequency Current Sensor 110 thereof are arranged in connection;
5.2) power current generator 2 and Bureau of Standards's discharge signal generator 3 is kept to close; Open FMAM signal generator 1, FMAM signal generator 1 is regulated to export the sinusoidal signal of a certain assigned frequency between 3MHz ~ 30MHz, and the amplitude regulating FMAM signal generator 1 to output signal makes high frequency partial discharge detector 11 reach full scale, record the crest voltage U that now FMAM signal generator 1 exports
mwith the full scale amplitude A of high frequency partial discharge detector 11
m;
5.3) amplitude of FMAM signal generator 1 output signal is reduced successively to λ U
m, wherein parameter lambda be respectively be less than 1 and be greater than 0 one group of decreasing values, the amplitude A that under record different parameters λ, high frequency partial discharge detector 11 exports
λ;
5.4) centralized control unit 8 calculates the linearity error of high frequency partial discharge detector 11 at different parameters λ value measurement point according to formula (3):
In formula (3), ε is the linearity error of high frequency partial discharge detector 11 at some parameter lambda value measurement points, A
λfor the amplitude that high frequency partial discharge detector 11 under this parameter lambda value exports, A
mfor the full scale amplitude of high frequency partial discharge detector 11.Generally speaking, the linearity error of high frequency partial discharge detector 11 require and the setting error of product export instructions be no more than ± 10%.
The calibration method of the present embodiment high frequency partial discharge detector verification system also comprises the step of high frequency partial discharge detector 11 being carried out to sensitivity calibrating, and detailed step comprises:
6.1) high frequency partial discharge detector 11 to be examined and determine and High Frequency Current Sensor 110 thereof are arranged in connection;
6.2) FMAM signal generator 1 and power current generator 2 is kept to close; Open Bureau of Standards's discharge signal generator 3, the output signal amplitude of control criterion Partial discharge signal generator 3 is 0, is recorded the initial output voltage amplitude A1 of now High Frequency Current Sensor 110 by high frequency partial discharge detector 11;
6.3) start from scratch and progressively increase the output signal amplitude of Bureau of Standards's discharge signal generator 3, and recorded the current output voltage amplitude A2 of now High Frequency Current Sensor 110 by high frequency partial discharge detector 11; When meeting current output voltage amplitude A2 and exceeding the twice of initial output voltage amplitude A1, record the output signal amplitude Q of now Bureau of Standards's discharge signal generator 3, this output signal amplitude Q is the sensitivity of high frequency partial discharge detector 11.Generally speaking, the sensitivity requirement of high frequency partial discharge detector 11 is generally no more than 10pC.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a high frequency partial discharge detector verification system, it is characterized in that: comprise FMAM signal generator (1), power current generator (2), Bureau of Standards's discharge signal generator (3), Signal-regulated kinase (4), concentric cable (5), matched impedance (6), oscillograph (7) and centralized control unit (8), the output terminal of described FMAM signal generator (1), the output terminal of Bureau of Standards's discharge signal generator (3) is connected with the input end of Signal-regulated kinase (4) respectively, the output terminal of described Signal-regulated kinase (4) is successively by concentric cable (5), matched impedance (6) ground connection, the High Frequency Current Sensor (110) of accredited high frequency partial discharge detector (11) is sheathed on the earthing cable of matched impedance (6) simultaneously, on the output cable of power current generator (2), one road detection terminal of described oscillograph (7) is connected with the front end of matched impedance (6), another road detection terminal is connected with the output terminal of High Frequency Current Sensor (110), the output terminal of described oscillograph (7) is connected with centralized control unit (8), described centralized control unit (8) respectively with FMAM signal generator (1), power current generator (2), the control end of Bureau of Standards's discharge signal generator (3) is connected.
2. high frequency partial discharge detector verification system according to claim 1, it is characterized in that: described Signal-regulated kinase (4) comprises channel switching circuit, impedance inverter circuit, signal amplification circuit, noise-removed filtering circuit and gain adjusting circuit, the output terminal of described FMAM signal generator (1), the output terminal of Bureau of Standards's discharge signal generator (3) is connected with the input end of channel switching circuit respectively, the output terminal of described channel switching circuit passes through impedance inverter circuit successively, signal amplification circuit, noise-removed filtering circuit is connected with the input end of gain adjusting circuit, the output terminal of described gain adjusting circuit is successively by concentric cable (5), matched impedance (6) ground connection.
3. high frequency partial discharge detector verification system according to claim 2, is characterized in that: described centralized control unit (8) is also connected with display unit (9) and man-machine interface (10).
4. a calibration method for claim 1 or the high frequency partial discharge detector verification system described in 2 or 3, is characterized in that, comprise the step of High Frequency Current Sensor (110) being carried out to saturation characteristic calibrating, detailed step comprises:
1.1) High Frequency Current Sensor (110) to be examined and determine is arranged in connection, and is connected with high frequency partial discharge detector (11) by the output terminal of High Frequency Current Sensor (110);
1.2) the Partial discharge signal generator (3) that maintains the standard cuts out, open FMAM signal generator (1), regulate that FMAM signal generator (1) output frequency is 10MHz, peak value is the sinusoidal signal of 1V and remains unchanged;
1.3) open power current generator (2) and start from scratch and increase output current gradually, the output voltage amplitude of the High Frequency Current Sensor (110) that the current value of record power current generator (2) and high frequency partial discharge detector (11) detect, when the output voltage amplitude of High Frequency Current Sensor (110) is reduced to 1/2 of open width value, record the actual measurement power frequency saturation current I of current value as High Frequency Current Sensor (110) of now power current generator (2), and the saturation current value error of High Frequency Current Sensor (110) is calculated according to formula (1),
In formula (1), △ I is the saturation current value error of High Frequency Current Sensor (110), and I is the actual measurement power frequency saturation current of High Frequency Current Sensor (110), I
gfor the nominal power frequency saturation current value of High Frequency Current Sensor (110).
5. the calibration method of high frequency partial discharge detector verification system according to claim 4, is characterized in that, also comprise the step of High Frequency Current Sensor (110) being carried out to amplitude versus frequency characte calibrating, detailed step comprises:
2.1) High Frequency Current Sensor (110) to be examined and determine is arranged in connection;
2.2) power current generator (2) and Bureau of Standards's discharge signal generator (3) is kept to close, open FMAM signal generator (1), regulate FMAM signal generator (1) output signal peak value be the sinusoidal signal of 1V and remain unchanged;
2.3) within the scope of 100kHz ~ 50MHz, progressively regulate the output signal frequency of FMAM signal generator (1), and to detect step-length in 100kHz ~ 1MHz frequency range be that to detect step-length in 100kHz, 1MHz ~ 50MHz frequency range be 1MHz; In the process regulating FMAM signal generator (1) output signal frequency, the output voltage amplitude of the frequency that record FMAM signal generator (1) outputs signal and the High Frequency Current Sensor (110) that oscillograph (7) exports;
2.4) output voltage amplitude of the High Frequency Current Sensor (110) that the frequency outputed signal according to FMAM signal generator (1) by centralized control unit (8) and oscillograph (7) are exported draws out the amplitude-versus-frequency curve of High Frequency Current Sensor (110) at 100kHz ~ 50MHz.
6. the calibration method of high frequency partial discharge detector verification system according to claim 5, is characterized in that, also comprise the step of High Frequency Current Sensor (110) being carried out to transfer impedance calibrating, detailed step comprises:
3.1) High Frequency Current Sensor (110) to be examined and determine is arranged in connection;
3.2) power current generator (2) and Bureau of Standards's discharge signal generator (3) is kept to close, open FMAM signal generator (1), peak value is 1V, signal frequency is the sinusoidal signal of 10MHz and remains unchanged to regulate FMAM signal generator (1) to output signal;
3.3) by the front voltage U of oscillograph (7) difference record matching impedance (6)
1with the output voltage U of High Frequency Current Sensor (110)
2;
3.4) centralized control unit (8) calculates the transfer impedance of High Frequency Current Sensor (110) according to formula (2);
In formula (2), Z is the transfer impedance of High Frequency Current Sensor (110), U
1for the front voltage of matched impedance (6), U
2for the output voltage of High Frequency Current Sensor (110).
7. the calibration method of high frequency partial discharge detector verification system according to claim 6, is characterized in that, also comprise the step of High Frequency Current Sensor (110) being carried out to measurement bandwidth calibrating, detailed step comprises:
4.1) High Frequency Current Sensor (110) to be examined and determine is arranged in connection;
4.2) power current generator (2) and Bureau of Standards's discharge signal generator (3) is kept to close, open FMAM signal generator (1), regulate FMAM signal generator (1) output signal peak value be the sinusoidal signal of 1V and remain unchanged;
4.3) within the scope of 100kHz ~ 50MHz, progressively regulate the output signal frequency of FMAM signal generator (1), and to detect step-length in 100kHz ~ 1MHz frequency range be that to detect step-length in 100kHz, 1MHz ~ 50MHz frequency range be 1MHz; In the process regulating FMAM signal generator (1) output signal frequency, the output voltage amplitude of the frequency that record FMAM signal generator (1) outputs signal and the High Frequency Current Sensor (110) that oscillograph (7) gathers;
4.4) frequency outputed signal according to FMAM signal generator (1) and the output voltage amplitude of High Frequency Current Sensor (110) draw out measurement bandwidth curve, the upper lower limiting frequency that when output voltage amplitude finding out High Frequency Current Sensor (110) drops to 0.5 times of maximal value from maximal value, FMAM signal generator (1) outputs signal, thus obtain the upper lower limiting frequency of High Frequency Current Sensor (110) measurement bandwidth.
8. the calibration method of high frequency partial discharge detector verification system according to claim 7, is characterized in that, also comprise the step of high frequency partial discharge detector (11) being carried out to linearity calibrating, detailed step comprises:
5.1) high frequency partial discharge detector (11) to be examined and determine and High Frequency Current Sensor (110) thereof are arranged in connection;
5.2) power current generator (2) and Bureau of Standards's discharge signal generator (3) is kept to close; Open FMAM signal generator (1), FMAM signal generator (1) is regulated to export the sinusoidal signal of a certain assigned frequency between 3MHz ~ 30MHz, and the amplitude regulating FMAM signal generator (1) to output signal makes high frequency partial discharge detector (11) reach full scale, records the crest voltage U that now FMAM signal generator (1) exports
mwith the full scale amplitude A of high frequency partial discharge detector (11)
m;
5.3) FMAM signal generator (1) amplitude that outputs signal is reduced successively to λ U
m, wherein parameter lambda be respectively be less than 1 and be greater than 0 one group of decreasing values, the amplitude A that under record different parameters λ, high frequency partial discharge detector (11) exports
λ;
5.4) centralized control unit (8) calculates the linearity error of high frequency partial discharge detector (11) at different parameters λ value measurement point according to formula (3):
In formula (3), ε is the linearity error of high frequency partial discharge detector (11) at some parameter lambda value measurement points, A
λfor the amplitude that high frequency partial discharge detector (11) under this parameter lambda value exports, A
mfor the full scale amplitude of high frequency partial discharge detector (11).
9. the calibration method of high frequency partial discharge detector verification system according to claim 8, is characterized in that, comprise the step of high frequency partial discharge detector (11) being carried out to sensitivity calibrating, detailed step comprises:
6.1) high frequency partial discharge detector (11) to be examined and determine and High Frequency Current Sensor (110) thereof are arranged in connection;
6.2) FMAM signal generator (1) and power current generator (2) is kept to close; Open Bureau of Standards's discharge signal generator (3), the output signal amplitude of control criterion Partial discharge signal generator (3) is 0, is recorded the initial output voltage amplitude A1 of now High Frequency Current Sensor (110) by high frequency partial discharge detector (11);
6.3) start from scratch and progressively increase the output signal amplitude of Bureau of Standards's discharge signal generator (3), and record the current output voltage amplitude A2 of now High Frequency Current Sensor (110) by high frequency partial discharge detector (11); When meeting current output voltage amplitude A2 and exceeding the twice of initial output voltage amplitude A1, record the output signal amplitude Q of now Bureau of Standards's discharge signal generator (3), this output signal amplitude Q is the sensitivity of high frequency partial discharge detector (11).
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