CN105223530B - High-frequency partial discharge detector calibration system and calibration method thereof - Google Patents
High-frequency partial discharge detector calibration system and calibration method thereof Download PDFInfo
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Abstract
The invention discloses a high-frequency partial discharge detector calibration system and a calibration method thereof. The system comprises a frequency modulation and amplitude modulation signal generator, a power-frequency current generator, a standard partial discharge signal generator, a signal conditioning module, a coaxial cable, a matching impedor, an oscilloscope, and a central control unit. The calibration method comprises the steps like calibrating the saturation characteristic of a high-frequency partial discharge detector. The amplitude and frequency of the frequency modulation and amplitude modulation signal generator are easy to adjust. The performance calibration requirement of high-frequency partial discharge detectors and high-frequency current sensors thereof can be satisfied. The problem on performance calibration of high-frequency partial discharge detectors and high-frequency current sensors thereof can be solved effectively and in a unified way. Regular inspection of high-frequency partial discharge detectors can be implemented easily. Good performance of high-frequency partial discharge detectors is ensured. The running status of electrical equipment can be reflected effectively. The system and the method of the invention have the advantages of accurate and reliable test results and easy implementation.
Description
Technical field
The present invention relates to electric power project engineering field, and in particular to a kind of high frequency partial discharge detector verification system and its
Calibration method, for carrying out performance detecting to high frequency partial discharge detector (HFCT).
Background technology
The requirement of the reliability and stability powered to electrical network with the fast development of China's economy, every profession and trade is increasingly
Height, the power failure test number (TN) of power equipment also will be reduced therewith, and live detection will progressively replace power failure test, become acquisition electric power
One of Main Means of status information of equipment.When electrical equipment occurs shelf depreciation, the height of frequency 3MHz-30MHz can be produced
Frequency pulse current, and along the metal parts propagation of electrical equipment, and ground is entered by earth lead, using High Frequency Current Sensor
(HFCT) this signal is can detect that, the sensor can be used for micro-current signal of the measurement frequency between more than ten kHz to 30MHz, and
Current signal is converted into into voltage signal, for reflecting the degree of shelf depreciation.High frequency partial discharges live detection as detection
The important means of electrical equipment health status, has played weight in the detection of the electrical equipment malfunctions such as transformator, cable and spark gap
Act on, as the application of high frequency partial discharge examination gradually increases, the performance of high frequency partial discharge detector (HFCT) is also drawn
Play the attention of people.But still lack at present and effective, the unified method of sensor performance calibrating is put about high frequency office, cause high frequency office
Put live detection instrument and all do not carry out periodic detection in use, instrument performance and measuring accuracy effectively cannot be protected
Barrier, causes scene larger using the result difference of different instrument tests, and credibility is not high, and test result cannot effectively, really
The running status of the electrical equipments such as reflection transformator, cable and spark gap.To solve the above problems, it is necessary to study a set of effective
, unified high frequency partial discharge examination sensor verification system and method, to solve high frequency partial discharge detector (HFCT)
Performance cannot periodic inspection problem, it is ensured that the superperformance of instrument detection, so as to ensure high frequency partial discharge detector (HFCT)
Testing result can accurately and efficiently reflect the running status of electrical equipment.
The content of the invention
The technical problem to be solved in the present invention is：For the problems referred to above of prior art, there is provided one kind disclosure satisfy that high frequency
The performance detecting of Partial discharge detector and its High Frequency Current Sensor requires, solution high frequency partial that can be effective, unified
The qualification problem of discharge detector and its High Frequency Current Sensor, conveniently realizes the regular inspection of high frequency partial discharge detector
Test, it is ensured that the superperformance of high frequency partial discharge detector, can effectively reflect the running status of electrical equipment, testing result
Accurately and reliably, the high frequency partial discharge detector verification system being easily achieved and its calibration method.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is：
The present invention provides a kind of high frequency partial discharge detector verification system, including FMAM signal generator, power frequency
The control of current feedback circuit, standard Partial discharge signal generator, Signal-regulated kinase, coaxial cable, matching impedance, oscillograph and center
Unit, the outfan of the FMAM signal generator, the outfan of standard Partial discharge signal generator respectively with signal condition
The input of module is connected, and the outfan of the Signal-regulated kinase passes sequentially through coaxial cable, matching impedance ground connection, accredited
The High Frequency Current Sensor of high frequency partial discharge detector is sheathed on earth cable, the power current generator of matching impedance simultaneously
Output cable on, the current output terminal of the power current generator is connected with current reflux input by output cable,
The oscillographic detection terminal all the way is connected with the front end of matching impedance, another road detection terminal and High Frequency Current Sensor
Outfan is connected, and the oscillographic outfan is connected with centralized control unit, and the centralized control unit is adjusted with frequency modulation respectively
Width signal generator, power current generator, the control end of standard Partial discharge signal generator are connected.
Preferably, the Signal-regulated kinase includes channel switching circuit, impedance inverter circuit, signal amplification circuit, goes
Make an uproar filter circuit and gain adjusting circuit, the outfan of the FMAM signal generator, standard Partial discharge signal generator
Outfan is connected with the input of channel switching circuit respectively, and the outfan of the channel switching circuit passes sequentially through impedance conversion
Circuit, signal amplification circuit, noise-removed filtering circuit are connected with the input of gain adjusting circuit, the gain adjusting circuit it is defeated
Go out end and pass sequentially through coaxial cable, matching impedance ground connection.
Preferably, the centralized control unit is also associated 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, including spreading to high-frequency electrical
Sensor carries out saturated characteristic the step of examine and determine, and detailed step includes：
1.1) High Frequency Current Sensor to be examined and determine is arranged in connection, and by the outfan of High Frequency Current Sensor and high frequency office
Portion's discharge detector is connected；
1.2) keep standard Partial discharge signal generator to close, open FMAM signal generator, adjust FMAM letter
Number generator output frequency be 10MHz, peak value for 1V sinusoidal signal and remain unchanged；
1.3) power current generator starting from scratch output current of gradually increase are opened, records power current generator
The output voltage amplitude of the High Frequency Current Sensor of current value and the detection of high frequency partial discharge detector, works as High Frequency Current Sensor
Output voltage amplitude when being reduced to the 1/2 of open width value, the current value of record now power current generator is used as high frequency electric
The actual measurement power frequency saturation current I of sensor, and the saturation current value error of High Frequency Current Sensor is calculated according to formula (1)；
In formula (1), saturation current value errors of the △ I for High Frequency Current Sensor, actual measurement works of the I for High Frequency Current Sensor
Frequency saturation current, IgFor the nominal power frequency saturation current value of High Frequency Current Sensor.
Preferably, the step of the method also includes that carrying out amplitude-frequency characteristic to High Frequency Current Sensor examines and determine, detailed step bag
Include：
2.1) High Frequency Current Sensor to be examined and determine is arranged in connection；
2.2) keep power current generator and standard Partial discharge signal generator to close, open FMAM signal and occur
Device, adjusts FMAM signal generator output signal peak value for the sinusoidal signal of 1V and remains unchanged；
2.3) output signal frequency of FMAM signal generator is progressively adjusted in the range of 100kHz～50MHz, and
Detect that step-length is that detection step-length is 1MHz in 100kHz, 1MHz～50MHz frequency ranges in 100kHz～1MHz frequency ranges；
During FMAM signal generator output signal frequency is adjusted, FMAM signal generator output signal is recorded
The output voltage amplitude of the High Frequency Current Sensor of frequency and oscillograph output；
2.4) exported according to the frequency and oscillograph of FMAM signal generator output signal by centralized control unit
The output voltage amplitude of High Frequency Current Sensor to draw out High Frequency Current Sensor bent in the amplitude-frequency characteristic of 100kHz～50MHz
Line.
Preferably, the step of the method also includes that being transmitted impedance to High Frequency Current Sensor examines and determine, detailed step bag
Include：
3.1) High Frequency Current Sensor to be examined and determine is arranged in connection；
3.2) keep power current generator and standard Partial discharge signal generator to close, open FMAM signal and occur
Device, adjusts FMAM signal generator output signal peak value for 1V, the sinusoidal signal that signal frequency is 10MHz and maintains not
Become；
3.3) the front voltage U of record matching impedance is distinguished by oscillograph1With the output voltage of High Frequency Current Sensor
U2；
3.4) centralized control unit calculates the transfer impedance of High Frequency Current Sensor according to formula (2)；
In formula (2), transfer impedances of the Z for High Frequency Current Sensor, U1For the front voltage of matching impedance, U2For high-frequency electrical
The output voltage of flow sensor.
Preferably, the method also includes High Frequency Current Sensor is carried out detecting the step of frequency band is examined and determine, detailed step bag
Include：
4.1) High Frequency Current Sensor to be examined and determine is arranged in connection；
4.2) keep power current generator and standard Partial discharge signal generator to close, open FMAM signal and occur
Device, adjusts FMAM signal generator output signal peak value for the sinusoidal signal of 1V and remains unchanged；
4.3) output signal frequency of FMAM signal generator is progressively adjusted in the range of 100kHz～50MHz, and
Detect that step-length is that detection step-length is 1MHz in 100kHz, 1MHz～50MHz frequency ranges in 100kHz～1MHz frequency ranges；
During FMAM signal generator output signal frequency is adjusted, FMAM signal generator output signal is recorded
The output voltage amplitude of the High Frequency Current Sensor of frequency and oscillograph collection；
4.4) the output voltage width according to the frequency and High Frequency Current Sensor of FMAM signal generator output signal
Value draws out detection frequency band curve, and the output voltage amplitude for finding out High Frequency Current Sensor drops to maximum from maximum
The upper lower limiting frequency of FMAM signal generator output signal when 0.5 times, so as to obtain High Frequency Current Sensor detection frequency
The upper lower limiting frequency of band.
Preferably, the step of the method also includes that carrying out the linearity to high frequency partial discharge detector examines and determine, detailed step
Including：
5.1) high frequency partial discharge detector to be examined and determine and its High Frequency Current Sensor are arranged in connection；
5.2) power current generator and standard Partial discharge signal generator is kept to close；Open FMAM signal to occur
Device, adjusts the sinusoidal signal of a certain assigned frequency between FMAM signal generator output 3MHz～30MHz, and adjusts tune
The amplitude of frequency modulation width signal generator output signal makes high frequency partial discharge detector reach full scale, records now FMAM
The crest voltage U of signal generator outputmWith full scale amplitude A of high frequency partial discharge detectorm；
5.3) amplitude of FMAM signal generator output signal is reduced successively to λ Um, wherein parameter lambda be respectively be less than
1 and one group of decreasing values more than 0, record amplitude A of high frequency partial discharge detector output under different parameters λλ；
5.4) centralized control unit calculates high frequency partial discharge detector in different parameters λ value measurement points according to formula
Linearity error：
In formula (3), ε be high frequency partial discharge detector some parameter lambda value measurement point linearity error, AλFor
The amplitude of high frequency partial discharge detector output, A under the parameter lambda valuemFor the full scale amplitude of high frequency partial discharge detector.
Preferably, the step of the method includes that entering line sensitivity to high frequency partial discharge detector examines and determine, detailed step bag
Include：
6.1) high frequency partial discharge detector to be examined and determine and its High Frequency Current Sensor are arranged in connection；
6.2) FMAM signal generator and power current generator is kept to close；Opening standard Partial discharge signal occurs
Device, the output signal amplitude for controlling standard Partial discharge signal generator are 0, record now high frequency by high frequency partial discharge detector
Initial output voltage amplitude A1 of current sensor；
6.3) start from scratch and be stepped up the output signal amplitude of standard Partial discharge signal generator, and put by high frequency partial
Electro-detection instrument records current output voltage amplitude A2 of now High Frequency Current Sensor；Surpass when current output voltage amplitude A2 is met
When crossing the twice of initial output voltage amplitude A1, output signal amplitude Q of now standard Partial discharge signal generator, the output are recorded
Signal amplitude Q is the sensitivity of high frequency partial discharge detector.
High frequency partial discharge detector verification system tool of the present invention has the advantage that：The high frequency partial discharge examination of the present invention
Instrument verification system includes FMAM signal generator, power current generator, standard Partial discharge signal generator, signal condition mould
Block, coaxial cable, matching impedance, oscillograph and centralized control unit, can realize high frequency partial discharge detector high frequency electric
It is the linearity of the saturated characteristic of sensor, amplitude-frequency characteristic, transfer impedance, detection frequency band and high frequency partial discharge detector, sensitive
Degree etc. performance calibrating, FMAM signal generator amplitude and frequency it is easy to adjust, disclosure satisfy that high frequency partial discharge examination
The calibrating requirement of instrument and its High Frequency Current Sensor, solution high frequency partial discharge detector that can be effective, unified and its height
The qualification problem of frequency current sensor, conveniently realizes the periodic inspection of high frequency partial discharge detector, it is ensured that high frequency partial
The superperformance of discharge detector, can effectively reflect the running status of electrical equipment, with testing result accurately and reliably, easily
In the advantage realized.
The calibration method of high frequency partial discharge detector verification system of the present invention is high frequency partial discharge detector of the present invention
Verification system is used for the calibrating including the performance including saturated characteristic, solution high frequency partial that equally also can be effective, unified
Including the qualification problem including saturated characteristic, discharge detector and its High Frequency Current Sensor conveniently realize that high frequency partial is put
The periodic inspection of electro-detection instrument, it is ensured that the superperformance of high frequency partial discharge detector, can effectively reflect electrical equipment
Running status, have the advantages that testing result accurately and reliably, be easily achieved.
Description of the drawings
Circuit theory schematic diagrams of the Fig. 1 for embodiment of the present invention system.
Fig. 2 is the detection frequency band curve that embodiment of the present invention system is drawn out.
Specific embodiment
As shown in figure 1, the high frequency partial discharge detector verification system of the present embodiment includes FMAM signal generator
1st, power current generator 2, standard Partial discharge signal generator 3, Signal-regulated kinase 4, coaxial cable 5, matching impedance 6, oscillography
Device 7 and centralized control unit 8, the outfan of FMAM signal generator 1, the outfan of standard Partial discharge signal generator 3 point
It is not connected with the input of Signal-regulated kinase 4, the outfan of Signal-regulated kinase 4 passes sequentially through coaxial cable 5, matching impedance
6 ground connection, the High Frequency Current Sensor 110 of accredited high frequency partial discharge detector 11 are sheathed on the ground connection of matching impedance 6 simultaneously
On cable, the output cable of power current generator 2, the current output terminal of power current generator 2 passes through output cable and electricity
Flow back to input to be connected, the detection terminal all the way of oscillograph 7 is connected with the front end of matching impedance 6, another road detection terminal and
The outfan of High Frequency Current Sensor 110 is connected, and the outfan of oscillograph 7 is connected with centralized control unit 8, centralized control unit
8 are connected with the control end of FMAM signal generator 1, power current generator 2, standard Partial discharge signal generator 3 respectively.Base
In said structure, the high frequency partial discharge detector verification system of the present embodiment can realize the full of High Frequency Current Sensor 110
In the linearity, sensitivity with characteristic, amplitude-frequency characteristic, transfer impedance, detection frequency band and high frequency partial discharge detector 11 arbitrarily
One or more and the calibrating of other performances, solution high frequency partial discharge detector 11 that can be effective, unified and its high frequency
The qualification problem of current sensor 110, conveniently realizes the periodic inspection of high frequency partial discharge detector 11, it is ensured that high frequency office
The superperformance of portion's discharge detector 11, can effectively reflect the running status of electrical equipment, accurately may be used with testing result
By, the advantage that is easily achieved.
In the present embodiment, FMAM signal generator 1 is used to examine and determine the amplitude-frequency characteristic of High Frequency Current Sensor 110, passes
The sensitivity of defeated impedance, detection frequency band, the linearity and high frequency partial discharge detector 11 and stability etc., it is possible to provide 0～50MHz
The adjustable high-frequency signal of amplitude；Power current generator 2 is mainly used in the saturated characteristic for examining and determine high frequency partial discharge detector 11,
The power frequency 50Hz electric current of 0～50A can be provided；Standard Partial discharge signal generator 3 can provide the Partial discharge signal of 0～500pC, specifically adopt
With Hangzhou West Lake Electronics Co., Ltd. HD types, pulse source is put in the Bureau of Standards.In the present embodiment, Signal-regulated kinase 4 includes that passage switches
Circuit, impedance inverter circuit, signal amplification circuit, noise-removed filtering circuit and gain adjusting circuit, FMAM signal generator 1
Outfan, the outfan of standard Partial discharge signal generator 3 be connected with the input of channel switching circuit respectively, passage switching electricity
The outfan on road passes sequentially through the input of impedance inverter circuit, signal amplification circuit, noise-removed filtering circuit and gain adjusting circuit
End be connected, the outfan of gain adjusting circuit passes sequentially through coaxial cable 5, matching impedance 6 and is grounded, due to channel switching circuit,
Impedance inverter circuit, signal amplification circuit, noise-removed filtering circuit and gain adjusting circuit are common available circuit, therefore which has
The not reinflated explanation in the present embodiment of body circuit structure.Coaxial cable 5 is used for transmission signal；Matching impedance 6 is used to match together
Shaft cable impedance, reduces setback reflection, general with 50 Ω resistance；Oscillograph 7 is used for the signal for showing test；Centralized control unit
8 various functions for being used for control verification system.
Shown in Fig. 1, the centralized control unit 8 of the present embodiment is also associated with display unit 9 and man-machine interface 10, display unit
9 are used to show signal amplitude and frequency that man-machine interface 10 to be used for operating instrument.Additionally, centralized control unit 8 can also be by remote
The modes such as journey network service, locally stored interface, realize remotely control and data to the calibrating of high frequency partial discharge detector
Exchange, locally automatically control and data storage etc., it is identical with the present embodiment which examines and determine principle substantially, therefore will not be described here.
The present embodiment high frequency partial discharge detector verification system can realize that the saturation of High Frequency Current Sensor 110 is special
Property, amplitude-frequency characteristic, transfer impedance, the inspection of the performance such as detection frequency band and the linearity of high frequency partial discharge detector 11, sensitivity
It is fixed.The calibration method of the present embodiment high frequency partial discharge detector verification system includes satisfying High Frequency Current Sensor 110
And the step of characterization, detailed step includes：
1.1) High Frequency Current Sensor 110 to be examined and determine is arranged in connection, and by the outfan of High Frequency Current Sensor 110 and
High frequency partial discharge detector 11 is connected；
1.2) keep standard Partial discharge signal generator 3 to close, open FMAM signal generator 1, adjust FMAM
1 output frequency of signal generator be 10MHz, peak value for 1V sinusoidal signal and remain unchanged；
1.3) power current generator 2 starting from scratch output current of gradually increase, record power current generator 2 are opened
Current value and high frequency partial discharge detector 11 detection High Frequency Current Sensor 110 output voltage amplitude, work as high-frequency electrical
When the output voltage amplitude of flow sensor 110 is reduced to the 1/2 of open width value, the current value of now power current generator 2 is recorded
As the actual measurement power frequency saturation current I of High Frequency Current Sensor 110, and the full of High Frequency Current Sensor 110 is calculated according to formula (1)
And current value error；
In formula (1), saturation current value errors of the △ I for High Frequency Current Sensor 110, I are High Frequency Current Sensor 110
Actual measurement power frequency saturation current, IgFor the nominal power frequency saturation current value of High Frequency Current Sensor 110.In general, high frequency electric
Saturation current value error delta I of sensor 110 not should be greater than ± 10%.
The calibration method of the present embodiment high frequency partial discharge detector verification system is also included to High Frequency Current Sensor 110
The step of carrying out amplitude-frequency characteristic and examine and determine, detailed step includes：
2.1) High Frequency Current Sensor 110 to be examined and determine is arranged in connection；
2.2) keep power current generator 2 and standard Partial discharge signal generator 3 to close, open FMAM signal and occur
Device 1, adjusts 1 output signal peak value of FMAM signal generator for the sinusoidal signal of 1V and remains unchanged；
2.3) output signal frequency of FMAM signal generator 1 is progressively adjusted in the range of 100kHz～50MHz, and
Detect that step-length is that detection step-length is 1MHz in 100kHz, 1MHz～50MHz frequency ranges in 100kHz～1MHz frequency ranges；
During 1 output signal frequency of FMAM signal generator is adjusted, 1 output signal of record FMAM signal generator
Frequency and oscillograph 7 output High Frequency Current Sensor 110 output voltage amplitude；
2.4) it is defeated according to the frequency and oscillograph 7 of 1 output signal of FMAM signal generator by centralized control unit 8
The output voltage amplitude of the High Frequency Current Sensor 110 for going out draws out width of the High Frequency Current Sensor 110 in 100kHz～50MHz
Frequency characteristic curve.In general, the error requirements of the amplitude-frequency characteristic of High Frequency Current Sensor 110 and product description less than ±
10%.
The calibration method of the present embodiment high frequency partial discharge detector verification system is also included to High Frequency Current Sensor 110
The step of being transmitted impedance and examine and determine, detailed step includes：
3.1) High Frequency Current Sensor 110 to be examined and determine is arranged in connection；
3.2) keep power current generator 2 and standard Partial discharge signal generator 3 to close, open FMAM signal and occur
Device 1, adjust 1 output signal peak value of FMAM signal generator be 1V, signal frequency for 10MHz sinusoidal signal and maintenance not
Become；
3.3) the front voltage U of record matching impedance 6 is distinguished by oscillograph 71With the output of High Frequency Current Sensor 110
Voltage U2；
3.4) centralized control unit 8 calculates the transfer impedance of High Frequency Current Sensor 110 according to formula (2)；
In formula (2), transfer impedances of the Z for High Frequency Current Sensor 110, U1For the front voltage of matching impedance 6, U2For height
The output voltage of frequency current sensor 110.In general, the transfer impedance of High Frequency Current Sensor 110 is more than 5mV/mA.
The calibration method of the present embodiment high frequency partial discharge detector verification system is also included to High Frequency Current Sensor 110
Carry out detecting the step of frequency band is examined and determine, detailed step includes：
4.1) High Frequency Current Sensor 110 to be examined and determine is arranged in connection；
4.2) keep power current generator 2 and standard Partial discharge signal generator 3 to close, open FMAM signal and occur
Device 1, adjusts 1 output signal peak value of FMAM signal generator for the sinusoidal signal of 1V and remains unchanged；
4.3) output signal frequency of FMAM signal generator 1 is progressively adjusted in the range of 100kHz～50MHz, and
Detect that step-length is that detection step-length is 1MHz in 100kHz, 1MHz～50MHz frequency ranges in 100kHz～1MHz frequency ranges；
During 1 output signal frequency of FMAM signal generator is adjusted, 1 output signal of record FMAM signal generator
Frequency and oscillograph 7 collection High Frequency Current Sensor 110 output voltage amplitude；
4.4) it is electric according to the output of the frequency and High Frequency Current Sensor 110 of 1 output signal of FMAM signal generator
Pressure amplitude value draws out detection frequency band curve, as shown in Fig. 2 finding out the output voltage amplitude of High Frequency Current Sensor 110 from maximum
The upper lower limiting frequency of 1 output signal of FMAM signal generator when value drops to 0.5 times (- 6dB) of maximum, so as to
The upper lower limiting frequency f of frequency band is detected to High Frequency Current Sensor 1101And f2.In general, the inspection of High Frequency Current Sensor 110
Frequency measurement band is between 3M～30MHz, and is less than ± 10% with the setting error of product export description.
The calibration method of the present embodiment high frequency partial discharge detector verification system is also included to high frequency partial discharge examination
Instrument 11 carries out the linearity the step of examine and determine, and detailed step includes：
5.1) high frequency partial discharge detector 11 to be examined and determine and its High Frequency Current Sensor 110 are arranged in connection；
5.2) power current generator 2 and standard Partial discharge signal generator 3 is kept to close；Open FMAM signal to occur
Device 1, adjusts the sinusoidal signal that FMAM signal generator 1 exports a certain assigned frequency between 3MHz～30MHz, and adjusts
The amplitude of 1 output signal of FMAM signal generator makes high frequency partial discharge detector 11 reach full scale, and record is now adjusted
The crest voltage U of the output of frequency modulation width signal generator 1mWith full scale amplitude A of high frequency partial discharge detector 11m；
5.3) amplitude of 1 output signal of FMAM signal generator is reduced successively to λ Um, wherein parameter lambda is respectively little
One group of decreasing values in 1 and more than 0, record amplitude A of the output of high frequency partial discharge detector 11 under different parameters λλ；
5.4) centralized control unit 8 calculates high frequency partial discharge detector 11 according to formula (3) and surveys in different parameters λ values
The linearity error of amount point：
In formula (3), ε be high frequency partial discharge detector 11 some parameter lambda value measurement point linearity error, Aλ
For the amplitude of the output of high frequency partial discharge detector 11 under the parameter lambda value, AmFor the full amount of high frequency partial discharge detector 11
Journey amplitude.In general, the linearity error of high frequency partial discharge detector 11 requires the setting with product export description
Error is less than ± 10%.
The calibration method of the present embodiment high frequency partial discharge detector verification system is also included to high frequency partial discharge examination
Instrument 11 enters line sensitivity the step of examine and determine, and detailed step includes：
6.1) high frequency partial discharge detector 11 to be examined and determine and its High Frequency Current Sensor 110 are arranged in connection；
6.2) FMAM signal generator 1 and power current generator 2 is kept to close；Opening standard Partial discharge signal occurs
Device 3, the output signal amplitude for controlling standard Partial discharge signal generator 3 is 0, is recorded now by high frequency partial discharge detector 11
Initial output voltage amplitude A1 of High Frequency Current Sensor 110；
6.3) start from scratch and be stepped up the output signal amplitude of standard Partial discharge signal generator 3, and pass through high frequency partial
Discharge detector 11 records current output voltage amplitude A2 of now High Frequency Current Sensor 110；When meeting current output voltage
When amplitude A2 exceedes the twice of initial output voltage amplitude A1, the output signal width of now standard Partial discharge signal generator 3 is recorded
Value Q, output signal amplitude Q are the sensitivity of high frequency partial discharge detector 11.In general, high frequency partial discharge examination
The sensitivity requirement of instrument 11 is usually no more than 10pC.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned enforcement
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
Should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of high frequency partial discharge detector verification system, it is characterised in that：Including FMAM signal generator (1), work
Frequency current feedback circuit (2), standard Partial discharge signal generator (3), Signal-regulated kinase (4), coaxial cable (5), matching impedance
(6), oscillograph (7) and centralized control unit (8), the outfan of the FMAM signal generator (1), standard Partial discharge signal
The outfan of generator (3) is connected with the input of Signal-regulated kinase (4) respectively, the output of the Signal-regulated kinase (4)
End passes sequentially through coaxial cable (5), matching impedance (6) ground connection, the high frequency electric of accredited high frequency partial discharge detector (11)
Sensor (110) is while be sheathed on the earth cable of matching impedance (6), the output cable of power current generator (2), described
The current output terminal of power current generator (2) is connected with current reflux input by output cable, the oscillograph (7)
All the way detection terminal be connected with the front end of matching impedance (6), the output of another road detection terminal and High Frequency Current Sensor (110)
End be connected, the outfan of the oscillograph (7) is connected with centralized control unit (8), the centralized control unit (8) respectively with tune
Frequency modulation width signal generator (1), power current generator (2), the control end of standard Partial discharge signal generator (3) are connected.
2. high frequency partial discharge detector verification system according to claim 1, it is characterised in that：The signal condition mould
Block (4) includes channel switching circuit, impedance inverter circuit, signal amplification circuit, noise-removed filtering circuit and gain adjusting circuit, institute
State the outfan of FMAM signal generator (1), the outfan of standard Partial discharge signal generator (3) and switch electricity with passage respectively
The input on road is connected, and the outfan of the channel switching circuit passes sequentially through impedance inverter circuit, signal amplification circuit, denoising
Filter circuit is connected with the input of gain adjusting circuit, and the outfan of the gain adjusting circuit passes sequentially through coaxial cable
(5), matching impedance (6) ground connection.
3. high frequency partial discharge detector verification system according to claim 2, it is characterised in that：The center control is single
First (8) are also associated with display unit (9) and man-machine interface (10).
4. the calibration method of the high frequency partial discharge detector verification system described in a kind of claim 1 or 2 or 3, its feature exist
In including the step of carrying out saturated characteristic to High Frequency Current Sensor (110) and examine and determine, detailed step includes：
1.1) High Frequency Current Sensor (110) to be examined and determine is arranged in connection, and by the outfan of High Frequency Current Sensor (110) and
High frequency partial discharge detector (11) is connected；
1.2) keep standard Partial discharge signal generator (3) to close, open FMAM signal generator (1), adjust FMAM
Signal generator (1) output frequency be 10MHz, peak value for 1V sinusoidal signal and remain unchanged；
1.3) power current generator (2) starting from scratch output current of gradually increase, record power current generator (2) are opened
Current value and the output voltage amplitude of High Frequency Current Sensor (110) that detects of high frequency partial discharge detector (11), work as height
When the output voltage amplitude of frequency current sensor (110) is reduced to the 1/2 of open width value, now power current generator (2) are recorded
Current value as High Frequency Current Sensor (110) actual measurement power frequency saturation current I, and according to formula (1) calculate high-frequency electrical spread
The saturation current value error of sensor (110)；
In formula (1), saturation current value errors of the △ I for High Frequency Current Sensor (110), I are High Frequency Current Sensor (110)
Actual measurement power frequency saturation current, IgFor 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, it is characterised in that also wrap
The step of amplitude-frequency characteristic is carried out to High Frequency Current Sensor (110) examining and determine is included, detailed step includes：
2.1) High Frequency Current Sensor (110) to be examined and determine is arranged in connection；
2.2) keep power current generator (2) and standard Partial discharge signal generator (3) to close, open FMAM signal and occur
Device (1), adjusts FMAM signal generator (1) output signal peak value for the sinusoidal signal of 1V and remains unchanged；
2.3) progressively adjust the output signal frequency of FMAM signal generator (1) in the range of 100kHz～50MHz, and
In 100kHz～1MHz frequency ranges, detection step-length is that detection step-length is 1MHz in 100kHz, 1MHz～50MHz frequency ranges；
During adjusting FMAM signal generator (1) output signal frequency, record FMAM signal generator (1) output letter
Number the output voltage amplitude of High Frequency Current Sensor (110) that exports of frequency and oscillograph (7)；
2.4) by centralized control unit (8) according to the frequency and oscillograph (7) of FMAM signal generator (1) output signal
The output voltage amplitude of the High Frequency Current Sensor (110) of output draw out High Frequency Current Sensor (110) 100kHz～
The amplitude-versus-frequency curve of 50MHz.
6. the calibration method of high frequency partial discharge detector verification system according to claim 5, it is characterised in that also wrap
The step of impedance is transmitted to High Frequency Current Sensor (110) examining and determine is included, detailed step includes：
3.1) High Frequency Current Sensor (110) to be examined and determine is arranged in connection；
3.2) keep power current generator (2) and standard Partial discharge signal generator (3) to close, open FMAM signal and occur
Device (1), adjusts FMAM signal generator (1) output signal peak value for 1V, the sinusoidal signal that signal frequency is 10MHz and ties up
Hold constant；
3.3) by the front voltage U of oscillograph (7) difference record matching impedance (6)1It is defeated with High Frequency Current Sensor (110)
Go out voltage U2；
3.4) centralized control unit (8) calculates the transfer impedance of High Frequency Current Sensor (110) according to formula (2)；
In formula (2), transfer impedances of the Z for High Frequency Current Sensor (110), U1For the front voltage of matching impedance (6), U2For height
The output voltage of frequency current sensor (110).
7. the calibration method of high frequency partial discharge detector verification system according to claim 6, it is characterised in that also wrap
Including carries out detecting the step of frequency band is examined and determine to High Frequency Current Sensor (110), and detailed step includes：
4.1) High Frequency Current Sensor (110) to be examined and determine is arranged in connection；
4.2) keep power current generator (2) and standard Partial discharge signal generator (3) to close, open FMAM signal and occur
Device (1), adjusts FMAM signal generator (1) output signal peak value for the sinusoidal signal of 1V and remains unchanged；
4.3) progressively adjust the output signal frequency of FMAM signal generator (1) in the range of 100kHz～50MHz, and
In 100kHz～1MHz frequency ranges, detection step-length is that detection step-length is 1MHz in 100kHz, 1MHz～50MHz frequency ranges；
During adjusting FMAM signal generator (1) output signal frequency, record FMAM signal generator (1) output letter
Number the output voltage amplitude of High Frequency Current Sensor (110) that gathers of frequency and oscillograph (7)；
4.4) it is electric according to the output of the frequency and High Frequency Current Sensor (110) of FMAM signal generator (1) output signal
Pressure amplitude value draws out detection frequency band curve, and the output voltage amplitude for finding out High Frequency Current Sensor (110) drops to from maximum
When 0.5 times of maximum, the upper lower limiting frequency of FMAM signal generator (1) output signal, spreads so as to obtain high-frequency electrical
Sensor (110) detects the upper lower limiting frequency of frequency band.
8. the calibration method of high frequency partial discharge detector verification system according to claim 7, it is characterised in that also wrap
The step of linearity is carried out to high frequency partial discharge detector (11) examining and determine is included, detailed step includes：
5.1) high frequency partial discharge detector (11) to be examined and determine and its High Frequency Current Sensor (110) are arranged in connection；
5.2) power current generator (2) and standard Partial discharge signal generator (3) is kept to close；Open FMAM signal to occur
Device (1), adjusts the sinusoidal signal of a certain assigned frequency between FMAM signal generator (1) output 3MHz～30MHz, and
The amplitude for adjusting FMAM signal generator (1) output signal makes high frequency partial discharge detector (11) reach full scale, remembers
The record crest voltage U that now FMAM signal generator (1) is exportedmWith the full scale width of high frequency partial discharge detector (11)
Value Am；
5.3) amplitude of FMAM signal generator (1) output signal is reduced successively to λ Um, wherein parameter lambda is respectively less than 1
And one group of decreasing values more than 0, record amplitude A that high frequency partial discharge detector (11) is exported under different parameters λλ；
5.4) centralized control unit (8) calculates high frequency partial discharge detector (11) according to formula (3) and surveys in different parameters λ values
The linearity error of amount point：
In formula (3), ε be high frequency partial discharge detector (11) some parameter lambda value measurement point linearity error, AλFor
The amplitude that high frequency partial discharge detector (11) is exported under the parameter lambda value, AmFor expiring for high frequency partial discharge detector (11)
Range amplitude.
9. the calibration method of high frequency partial discharge detector verification system according to claim 8, it is characterised in that include
The step of entering line sensitivity to high frequency partial discharge detector (11) and examine and determine, detailed step includes：
6.1) high frequency partial discharge detector (11) to be examined and determine and its High Frequency Current Sensor (110) are arranged in connection；
6.2) FMAM signal generator (1) and power current generator (2) is kept to close；Opening standard Partial discharge signal occurs
Device (3), the output signal amplitude for controlling standard Partial discharge signal generator (3) are 0, are remembered by high frequency partial discharge detector (11)
Record initial output voltage amplitude A1 of now High Frequency Current Sensor (110)；
6.3) start from scratch and be stepped up the output signal amplitude of standard Partial discharge signal generator (3), and put by high frequency partial
Electro-detection instrument (11) records current output voltage amplitude A2 of now High Frequency Current Sensor (110)；When meeting, current output is electric
When pressure amplitude value A2 exceedes the twice of initial output voltage amplitude A1, the output letter of now standard Partial discharge signal generator (3) is recorded
Number amplitude Q, output signal amplitude Q are the sensitivity of high frequency partial discharge detector (11).
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| CN105607023A (en) * | 2016-01-28 | 2016-05-25 | 云南电网有限责任公司电力科学研究院 | Pulse signal generation and measurement method for calibration of partial discharge detector |
| CN106199478B (en) * | 2016-06-30 | 2023-03-10 | 杭州西湖电子研究所 | Examination and verification device and method for high-frequency current method partial discharge detector |
| CN106772178A (en) * | 2016-12-12 | 2017-05-31 | 国网北京市电力公司 | The calibration equipment of high frequency electric live testing apparatus for local discharge, method and device |
| CN107462852A (en) * | 2017-06-22 | 2017-12-12 | 广西电网有限责任公司电力科学研究院 | A kind of scaling method of high frequency partial discharge examination instrument parameter |
| CN107167715B (en) * | 2017-06-30 | 2019-09-27 | 中国西电电气股份有限公司 | A kind of test loop partial discharge IED intelligence GIS and method |
| CN107656226B (en) * | 2017-09-05 | 2019-09-24 | 四川大学 | HFCT electrical parameter test device and test method based on transmission coefficient |
| CN107561475A (en) * | 2017-10-24 | 2018-01-09 | 广州供电局有限公司 | High Frequency Current Sensor frequency band quantifies method of calibration, system and device |
| CN108572342A (en) * | 2018-04-20 | 2018-09-25 | 国网河北能源技术服务有限公司 | A kind of flashover position indicator calibrating installation and method |
| CN109407026B (en) * | 2018-11-15 | 2024-03-19 | 昆明理工大学 | Evaluation device and method for ultrahigh frequency partial discharge instrument |
| CN110286346A (en) * | 2019-07-30 | 2019-09-27 | 南京荣港电气技术有限公司 | The automated calibration system and method for a kind of superfrequency part instrument |
| CN112363100B (en) * | 2020-11-11 | 2023-10-20 | 贵州电网有限责任公司 | Fault detection device of state monitoring sensor |
| CN113484579B (en) * | 2021-06-16 | 2023-07-07 | 深圳供电局有限公司 | Magnetic saturation characteristic determining method, apparatus, computer device, and storage medium |
| CN113504498B (en) * | 2021-08-16 | 2022-11-22 | 国网湖南省电力有限公司 | Performance detection method and system of partial discharge intelligent sensing terminal |
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