CN103197272B - A kind of system and method testing partial discharge transient earth voltage detector performance - Google Patents
A kind of system and method testing partial discharge transient earth voltage detector performance Download PDFInfo
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- CN103197272B CN103197272B CN201310084623.7A CN201310084623A CN103197272B CN 103197272 B CN103197272 B CN 103197272B CN 201310084623 A CN201310084623 A CN 201310084623A CN 103197272 B CN103197272 B CN 103197272B
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Abstract
The invention provides a kind of system and method testing partial discharge transient earth voltage detector performance, system comprises signal generator, concentric cable 2, sheet metal, build-out resistor 4, TEV sensor 5, transient earth voltage detector 6 and signal cable 7; Signal generator is sinusoidal signal generator 1 or pulse signal generator 8, signal generator is connected by concentric cable 2 with sheet metal, transient earth voltage detector 6 and TEV (Transient? earth? voltage, transient state voltage-to-ground) sensor 5 is connected by signal cable 7, TEV sensor 5 is close on the surface of sheet metal, sheet metal is by build-out resistor 4 ground connection, and the earth terminal of signal generator and transient earth voltage detector 6 is directly connected to the ground; The type of the signal sent by conditioning signal generator, amplitude or size, the linearity error of test transient earth voltage detector 6, step-by-step counting measuring error, stability error and positioning function.Method of testing easily realizes, it is simple and quick to debug, test process digitizing.
Description
Technical field
The present invention relates to high-tension power transmission and transformation equipment discharge fault detection technique field, be specifically related to a kind of system and method testing partial discharge transient earth voltage detector performance.
Background technology
Partial discharge transient earth voltage detection method is as a kind of live detection technology, and have the advantages such as easy to use, with strong points, progressively transformer station promotes the use of at home.Partial discharge transient earth voltage detector is generally used for and carries out shelf depreciation live detection or shelf depreciation status monitoring to ac metal closing switch gear (abbreviation switch cubicle).Inside switch cabinet shelf depreciation can generate electromagnetic waves, and forms skin effect and propagate along metal surface in metallic walls, produces transient earth voltage in metal surface simultaneously.There is direct relation the position of the size of transient earth voltage signal that shelf depreciation produces and the intensity of shelf depreciation and point of discharge.Therefore, special sensor can be utilized to detect transient earth voltage signal, to judge the shelf depreciation defect of inside switch cabinet, mistiming or the difference in magnitude of the transient earth voltage signal arrival diverse location sensor that simultaneously same discharge source can be utilized to produce position Partial Discharge Sources.
At present, transient earth voltage detector lacks standardization, unified consistent method of testing and test macro, and have impact on manufacture and the inspection of instrument, the technology of hindering further develops.Therefore, the research carrying out transient earth voltage detector test macro and detection method has important actual directive significance.
Summary of the invention
The present invention relates to a kind of system and method testing partial discharge transient earth voltage detector performance, described system comprises signal generator, concentric cable 2, sheet metal, build-out resistor 4, TEV sensor 5, transient earth voltage detector 6 and signal cable 7;
Described signal generator is sinusoidal signal generator 1 or pulse signal generator 8, described signal generator is connected by described concentric cable 2 with described sheet metal, described transient earth voltage detector 6 is connected by described signal cable 7 with described TEV sensor 5, described TEV sensor 5 is close on the surface of described sheet metal, described sheet metal is by described build-out resistor 4 ground connection, and the earth terminal of described signal generator and described transient earth voltage detector 6 is directly connected to the ground;
The type of the signal sent by regulating described signal generator, amplitude or size, test the frequency band of described transient earth voltage detector 6, linearity error, step-by-step counting measuring error, stability error and positioning function according to the output valve of described tested transient earth voltage detector 6.
In first preferred embodiment provided by the invention: described signal generator is sinusoidal signal generator 1;
Described sheet metal is performance test sheet metal 3, and described performance test sheet metal 3 is the galvanized iron sheet that circular arc process is carried out in the thick 3mm corner of the wide 300mm of long 300mm;
The quantity of described TEV sensor 5 is one, is close on the surface of the described performance test sheet metal 3 vertically placed.
In second preferred embodiment provided by the invention: described signal generator is pulse signal generator 8;
Described sheet metal is performance test sheet metal 3, and described performance test sheet metal 3 is the galvanized iron sheet that circular arc process is carried out in the thick 3mm corner of the wide 300mm of long 300mm;
The quantity of described TEV sensor 5 is one, is close on the surface of the described performance test sheet metal 3 vertically placed.
In 3rd preferred embodiment provided by the invention: described signal generator is pulse signal generator 8;
Described sheet metal is assignment test sheet metal 9, and described assignment test sheet metal 9 is the galvanized iron sheet that circular arc process is carried out in the thick 3mm corner of the wide 150mm of long 2000mm;
The quantity of described TEV sensor 5 is two, and described two TEV sensors 5 are all close on the surface of described assignment test sheet metal 9 of horizontal positioned.
In 4th preferred embodiment provided by the invention: the model of described signal generator is Agilent33250.
In 5th preferred embodiment provided by the invention: the size of described build-out resistor 4 is 50 Ω.
6th preferred embodiment provided by the invention provides a kind of method of testing partial discharge transient earth voltage detector performance, the system that described method provides based on the first preferred embodiment, tests the frequency band of described transient earth voltage detector 6, comprising:
Step S101, the amplitude of the sine wave signal regulating described sinusoidal signal generator 1 to export is to arbitrary value within the scope of 2V-5V and remain unchanged;
Step S102, between the bound cutoff frequency that described tested transient earth voltage detector 6 specifies, change the described sinusoidal wave frequency of the output of described sinusoidal signal generator 1, detect that described tested transient earth voltage detector 6 outputs signal the centre frequency f in substantially constant region
c;
Step S103, with described tested transient earth voltage detector 6 output signal frequency for f
cthe sine wave output signal frequency of Shi Suoshu sinusoidal signal generator 1 is initial value, the frequency of described sine wave signal is reduced with 1MHz step-length, and ensure that described sine wave signal voltage magnitude is constant, find out described tested transient earth voltage detector 6 normalization and export Frequency point when dropping to 0.501, Frequency point when described output drops to 0.501 is the lower-cut-off frequency f of the actual measurement of described tested transient earth voltage detector
under;
Step S104, with described tested transient earth voltage detector 6 output signal frequency for f
cthe sine wave output signal frequency of Shi Suoshu sinusoidal signal generator 1 is initial value, the frequency of described sine wave signal is raised with 1MHz step-length, and ensure that described sine wave signal voltage magnitude is constant, find out described tested transient earth voltage detector 6 normalization exporting change to 0.501 time Frequency point, described exporting change to 0.501 time Frequency point be the upper cut-off frequency f of the actual measurement of described tested transient earth voltage detector 6
on;
Step S105, the upper cut-off frequency f of the described actual measurement of the described tested transient earth voltage detector 6 obtained according to described step S103 and step S104
onwith lower-cut-off frequency f
under, try to achieve the frequency band of described tested transient earth voltage detector 6, calculate described tested transient earth voltage detector 6 upper cut-off frequency f
onwith lower-cut-off frequency f
undererror delta f
onwith Δ f
underbe respectively Δ f
on=[(f
on-f
b)/f] × 100%, Δ f
under=[(f
under-f
b)/f] × 100%;
Wherein: f
bfor the nominal cutoff frequency of described tested transient earth voltage detector, f
on, f
underand f
bunit be Hz.
7th preferred embodiment provided by the invention provides a kind of method of testing partial discharge transient earth voltage detector performance, the system that described method provides based on the first preferred embodiment, tests the linearity error of described transient earth voltage detector 6; Comprise:
S201, arranges the sinusoidal signal frequency that described sinusoidal signal generator 1 exports and is fixed as a certain frequency values between 3MHz ~ 50MHz;
S202, the amplitude of the described sine wave signal regulating described sinusoidal signal generator 1 to export makes the response of described transient earth voltage detector 6 be more than or equal to 30dB, and records the crest voltage U of described sinusoidal signal generator 1 and described transient earth voltage detector 6 full scale value A;
S203, reduces described sinusoidal signal generator 1 amplitude successively to λ U, λ=0.8,0.6,0.4,0.2, records the corresponding indicating value A λ that described transient earth voltage detector 6 exports respectively;
S204, calculate λ=0.8,0.6,0.4, the linearity error of each measurement point of 0.2
8th preferred embodiment provided by the invention provides a kind of method of testing partial discharge transient earth voltage detector performance, the system that described method provides based on the second preferred embodiment, test the step-by-step counting measuring error of described transient earth voltage detector 6, comprising:
S301, arranges described pulse signal generator 8 output pulse signal, changes the voltage magnitude of the pulse signal of described output, makes the reading of described transient earth voltage detector 6 be more than or equal to 20dB;
S302, the repetition frequency of the described pulse signal regulating described pulse signal generator 1 to export is one or more selectable value in 0.5kHz ~ 10kHz, observes simultaneously and records the counted number of pulses reading n of described transient earth voltage detector 6
xwith the actual pulse number n set by described pulse signal generator 1;
S303, calculates step-by-step counting the measuring error δ=[(n of described tested transient earth voltage detector 6
x-n)/n] × 100%.
9th preferred embodiment provided by the invention provides a kind of method of testing partial discharge transient earth voltage detector performance, the system that described method provides based on the second preferred embodiment, tests the stability error of described transient earth voltage detector 6, comprising:
S401, arranges the square-wave signal that described pulse signal generator 8 exports constant amplitude, frequency;
S402, described transient earth voltage detector 6 is started shooting continuous working 1 hour, records the response of described transient earth voltage detector 6 from just start to continuous working after 1 hour;
S403, calculates the stability error of described tested transient earth voltage detector 6
Wherein: x
1for response during the just start of described tested transient earth voltage detector 6, x
2for the response of described tested transient earth voltage detector 6 continuous working after 1 hour,
for the just start of described tested transient earth voltage detector 6 is to the mean value of the response of continuous working after 1 hour.
Tenth preferred embodiment provided by the invention provides a kind of method of testing partial discharge transient earth voltage detector performance, and the system that described method provides based on the 3rd preferred embodiment is tested the positioning function of described transient earth voltage detector 6, being comprised:
S501, arranges described two the TEV sensors 5 on described transient earth voltage detector 6, makes the distance of described two sensors 5 be greater than the detection and localization distance of described transient earth voltage detector 6 regulation;
S502, arranges the pulse signal that described pulse signal generator 8 exports constant amplitude, regulates the pulse repetition frequency of described output to be a certain value between 50Hz ~ 10kHz;
Whether S503, check from the described TEV sensor 5 close to described pulse signal generator 8 and be triggered.
A kind of beneficial effect testing the system and method for partial discharge transient earth voltage detector performance provided by the invention comprises:
A kind of system and method testing partial discharge transient earth voltage detector performance provided by the invention, the project detecting transient earth voltage detector performance comprises frequency band, linearity error, stability error, step-by-step counting error and positioning function, the advantages such as method of testing easily realizes, it is simple and quick to debug, test process digitizing, are suitable for power industry and carry out the occasions such as routine maintenance, test, correction in the processes using transient earth voltage detector.
Accompanying drawing explanation
Be illustrated in figure 1 a kind of structured flowchart testing the embodiment one of the system of partial discharge transient earth voltage detector performance provided by the invention;
Be illustrated in figure 2 a kind of structured flowchart testing the embodiment two of the system of partial discharge transient earth voltage detector performance provided by the invention;
Be illustrated in figure 3 a kind of structured flowchart testing the embodiment three of the system of partial discharge transient earth voltage detector performance provided by the invention;
In figure: 1 is sinusoidal signal generator; 2 is concentric cable; 3 is performance test sheet metal; 4 is build-out resistor; 5 is TEV sensor; 6 is transient earth voltage detector; 7 is signal cable; 8 is pulse signal generator; 9 is assignment test sheet metal.
Embodiment
With reference to the accompanying drawings the specific embodiment of the present invention is described in further detail below.
The invention provides a kind of system and method testing partial discharge transient earth voltage detector performance, this system comprises signal generator, concentric cable 2, sheet metal, build-out resistor 4, TEV sensor 5, transient earth voltage detector 6 and signal cable 7.
Signal generator is sinusoidal signal generator 1 or pulse signal generator 8, signal generator is connected by concentric cable 2 with sheet metal, transient earth voltage detector 6 is connected by signal cable 7 with TEV sensor 5, TEV sensor 5 is close on the surface of sheet metal, sheet metal is by build-out resistor 4 ground connection, and the earth terminal of signal generator and transient earth voltage detector 6 is directly connected to the ground.
The type of the signal sent by conditioning signal generator, amplitude or size, test the frequency band of this transient earth voltage detector 6, linearity error, step-by-step counting measuring error, stability error and positioning function according to the output valve of tested transient earth voltage detector 6.
Embodiment one:
Embodiment one provided by the invention is a kind of embodiment one of testing the system of partial discharge transient earth voltage detector performance, its structured flowchart as shown in Figure 1, as shown in Figure 1, in the embodiment one of the system of this test partial discharge transient earth voltage detector performance, signal generator is sinusoidal signal generator 1, and the model of sinusoidal signal generator 1 can be Agilent33250.Sheet metal is performance test sheet metal 3, can adopt the thick 3mm galvanized iron sheet of the wide 300mm of long 300mm, and circular arc process is carried out in corner.The size of build-out resistor 4 can be 50 Ω.The quantity of TEV sensor 5 is one, and this TEV sensor 5 is close on the surface of the performance test sheet metal 3 vertically placed.
Embodiment two:
Embodiment two provided by the invention is a kind of embodiment one of testing the method for partial discharge transient earth voltage detector performance, test the embodiment one of embodiment one based on the system of test partial discharge transient earth voltage detector performance as shown in Figure 1 of the method for partial discharge transient earth voltage detector performance, the frequency band of test transient earth voltage detector 6, the method comprises:
Step S101, regulates the amplitude of the sine wave signal of the output of sinusoidal signal generator 1 to arbitrary value within the scope of 2V-5V and remains unchanged.
Step S102, changes the sinusoidal wave frequency of the output of sinusoidal signal generator 1, detects that tested transient earth voltage detector 6 outputs signal the centre frequency f in substantially constant region between the bound cutoff frequency that tested transient earth voltage detector 6 specifies
c.
Step S103, with tested transient earth voltage detector 6 output signal frequency for f
ctime sinusoidal signal generator 1 sine wave output signal frequency be initial value, the frequency of sine wave signal is reduced with 1MHz step-length, and ensure that this sine wave signal voltage magnitude is constant, find out tested transient earth voltage detector 6 normalization and export Frequency point (-6dB point) when dropping to 0.501, this point is the lower-cut-off frequency f of actual measurement
under.
Step S104, with tested transient earth voltage detector 6 output signal frequency for f
ctime sinusoidal signal generator 1 sine wave output signal frequency be initial value, the frequency of sine wave signal is raised with 1MHz step-length, and ensure that this sine wave signal voltage magnitude is constant, find out tested transient earth voltage detector 6 normalization exporting change to 0.501 time Frequency point (-6dB point), this point is the upper cut-off frequency f of the actual measurement of tested transient earth voltage detector 6
on.
Step S105, the upper cut-off frequency f of the actual measurement of the tested transient earth voltage detector 6 obtained according to step S103 and step S104
onwith lower-cut-off frequency f
under, in the hope of the frequency band of tested transient earth voltage detector 6, and tested transient earth voltage detector 6 upper cut-off frequency f can be calculated
onwith lower-cut-off frequency f
undererror delta f
onwith Δ f
underbe respectively Δ f
on=[(f
on-f
b)/f] × 100%, Δ f
under=[(f
under-f
b)/f] × 100%.
In formula: f
bfor the nominal cutoff frequency of tested transient earth voltage detector, f
on, f
underand f
bunit be Hz.
General, cutoff frequency error delta f
onwith Δ f
undershould in the scope of-10% to+10%.
Embodiment three:
Embodiment three provided by the invention is a kind of embodiment two of testing the method for partial discharge transient earth voltage detector performance, test the embodiment one of embodiment two based on the system of test partial discharge transient earth voltage detector performance as shown in Figure 1 of the method for partial discharge transient earth voltage detector performance, the linearity error of test transient earth voltage detector 6, the method comprises:
S201, arranges the sine wave signal frequency that sinusoidal signal generator 1 exports and is fixed as a certain frequency values between 3MHz ~ 50MHz.
S202, the amplitude of the sine wave signal regulating sinusoidal signal generator 1 to export makes the response of transient earth voltage detector 6 be more than or equal to 30dB, and records crest voltage U and the transient earth voltage detector 6 full scale value A of sinusoidal signal generator 1.
S203, reduces sinusoidal signal generator 1 amplitude successively to λ U, λ=0.8,0.6,0.4,0.2, records the corresponding indicating value A λ that transient earth voltage detector 6 exports respectively.
S204, calculate λ=0.8,0.6,0.4, the linearity error of each measurement point of 0.2
General, linearity error ε
lshould in the scope of-20% to+20%.
Embodiment four:
Embodiment four provided by the invention is a kind of embodiment four of testing the system of partial discharge transient earth voltage detector performance, its structured flowchart as shown in Figure 2, as shown in Figure 2, in the embodiment two of the system of this test partial discharge transient earth voltage detector performance, signal generator is pulse signal generator 8, and the model of pulse signal generator 8 can be Agilent33250.Sheet metal is performance test sheet metal 3, can adopt the thick 3mm galvanized iron sheet of the wide 300mm of long 300mm, and circular arc process is carried out in corner.The size of build-out resistor 4 can be 50 Ω.The quantity of TEV sensor 5 is one, and this TEV sensor 5 is close on the surface of the performance test sheet metal 3 vertically placed.
Embodiment five:
Embodiment five provided by the invention is a kind of embodiment three of testing the method for partial discharge transient earth voltage detector performance, test the embodiment two of embodiment three based on the system of test partial discharge transient earth voltage detector performance as shown in Figure 2 of the method for partial discharge transient earth voltage detector performance, the step-by-step counting measuring error of test transient earth voltage detector 6, the method comprises:
S301, arranges pulse signal generator 8 output pulse signal, changes the voltage magnitude of the pulse signal exported, makes the reading of transient earth voltage detector 6 be more than or equal to 20dB.
S302, the repetition frequency of pulse signal that regulating impulse signal generator 1 exports is one or more selectable value in 0.5kHz ~ 10kHz, observes simultaneously and records the counted number of pulses reading n of transient earth voltage detector 6
xwith the actual pulse number n set by pulse signal generator 1.
S303, calculates tested transient earth voltage detector 6 step-by-step counting measuring error δ=[(n
x-n)/n] × 100%.
General, step-by-step counting measuring error δ should in the scope of-10% to+10%.
Embodiment six:
Embodiment six provided by the invention is a kind of embodiment four of testing the method for partial discharge transient earth voltage detector performance, test the embodiment two of embodiment four based on the system of test partial discharge transient earth voltage detector performance as shown in Figure 2 of the method for partial discharge transient earth voltage detector performance, the stability error of test transient earth voltage detector 6, the method comprises:
S401, arranges the square-wave signal that pulse signal generator 8 exports constant amplitude, frequency.
S402, transient earth voltage detector 6 is started shooting continuous working 1 hour, records the response of this transient earth voltage detector 6 from just start to continuous working after 1 hour.
S403, calculates the stability error of tested transient earth voltage detector 6
In formula: x
1for response during the just start of tested transient earth voltage detector 6, x
2for the response of tested transient earth voltage detector 6 continuous working after 1 hour,
for the just start of tested transient earth voltage detector 6 is to the mean value of the response of continuous working after 1 hour.
General, stability error δ ' should in the scope of-20% to+20%.
Embodiment seven:
Embodiment seven provided by the invention is a kind of embodiment three of testing the system of partial discharge transient earth voltage detector performance, its structured flowchart as shown in Figure 3, as shown in Figure 3, in the embodiment three of the system of this test partial discharge transient earth voltage detector performance, signal generator is pulse signal generator 8, and the model of pulse signal generator 8 can be Agilent33250.Sheet metal is assignment test sheet metal 9, can adopt the thick 3mm galvanized iron sheet of the wide 150mm of long 2000mm, and circular arc process is carried out in corner.The size of build-out resistor 4 can be 50 Ω.The quantity of TEV sensor 5 is two, and two TEV sensors 5 are all close on the surface of assignment test sheet metal 9 of horizontal positioned.
Embodiment eight:
Embodiment eight provided by the invention is a kind of embodiment five of testing the method for partial discharge transient earth voltage detector performance, test the embodiment three of embodiment five based on the system of test partial discharge transient earth voltage detector performance as shown in Figure 3 of the method for partial discharge transient earth voltage detector performance, the positioning function of test transient earth voltage detector 6, the method comprises:
S501, arranges two TEV sensors 5 on transient earth voltage detector 6, makes the distance of two sensors 5 be greater than the detection and localization distance of transient earth voltage detector 6 regulation.
S502, arranges the pulse signal that pulse signal generator 8 exports constant amplitude, and the pulse repetition frequency of regulation output is a certain value between 50Hz ~ 10kHz.
Whether S503, check from the TEV sensor 5 close to pulse signal generator 8 and be triggered.
Whether the positioning function of detector 6 realizes according to the sequencing and signal time difference that detect TEV signal arrival sensor, therefore observe and trigger from the TEV sensor close to signal source, can judge that whether the positioning function of detector 6 is normal.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (11)
1. test the system of partial discharge transient earth voltage detector performance for one kind, it is characterized in that, described system comprises signal generator, concentric cable (2), sheet metal, build-out resistor (4), TEV sensor (5), transient earth voltage detector (6) and signal cable (7);
Described signal generator is sinusoidal signal generator (1) or pulse signal generator (8), described signal generator is connected by described concentric cable (2) with described sheet metal, described transient earth voltage detector (6) is connected by described signal cable (7) with described TEV sensor (5), described TEV sensor (5) is close on the surface of described sheet metal, described sheet metal is by described build-out resistor (4) ground connection, and the earth terminal of described signal generator and described transient earth voltage detector (6) is directly connected to the ground;
The type of the signal sent by regulating described signal generator, amplitude or size, test the frequency band of described transient earth voltage detector (6), linearity error, step-by-step counting measuring error, stability error and positioning function according to the output valve of tested transient earth voltage detector (6).
2. the system as claimed in claim 1, is characterized in that, described signal generator is sinusoidal signal generator (1); Described sheet metal is performance test sheet metal (3), and described performance test sheet metal (3) is for carrying out the galvanized iron sheet of circular arc process in the thick 3mm corner of the wide 300mm of long 300mm;
The quantity of described TEV sensor (5) is one, is close on the surface of the described performance test sheet metal (3) of vertically placing.
3. the system as claimed in claim 1, is characterized in that, described signal generator is pulse signal generator (8); Described sheet metal is performance test sheet metal (3), and described performance test sheet metal (3) is for carrying out the galvanized iron sheet of circular arc process in the thick 3mm corner of the wide 300mm of long 300mm;
The quantity of described TEV sensor (5) is one, is close on the surface of the described performance test sheet metal (3) of vertically placing.
4. the system as claimed in claim 1, is characterized in that, described signal generator is pulse signal generator (8); Described sheet metal is assignment test sheet metal (9), and described assignment test sheet metal (9) is for carrying out the galvanized iron sheet of circular arc process in the thick 3mm corner of the wide 150mm of long 2000mm;
The quantity of described TEV sensor (5) is two, and described two TEV sensors (5) are all close on the surface of described assignment test sheet metal (9) of horizontal positioned.
5. the system as claimed in claim 1, is characterized in that, the model of described signal generator is Agilent33250.
6. the system as claimed in claim 1, is characterized in that, the size of described build-out resistor (4) is 50 Ω.
7. test a method for partial discharge transient earth voltage detector performance, it is characterized in that, described method, based on system as claimed in claim 2, is tested the frequency band of described transient earth voltage detector (6), being comprised:
Step S101, the amplitude of the sine wave signal regulating described sinusoidal signal generator (1) to export is to arbitrary value within the scope of 2V-5V and remain unchanged;
Step S102, between the bound cutoff frequency that described tested transient earth voltage detector (6) specifies, change the described sinusoidal wave frequency of the output of described sinusoidal signal generator (1), detect the centre frequency f in described tested transient earth voltage detector (6) output signal substantially constant region
c;
Step S103, with described tested transient earth voltage detector (6) output signal frequency for f
cthe sine wave output signal frequency of Shi Suoshu sinusoidal signal generator (1) is initial value, the frequency of described sine wave signal is reduced with 1MHz step-length, and ensure that described sine wave signal voltage magnitude is constant, find out described tested transient earth voltage detector (6) normalization and export Frequency point when dropping to 0.501, Frequency point when described output drops to 0.501 is the lower-cut-off frequency f of the actual measurement of described tested transient earth voltage detector
under;
Step S104, with described tested transient earth voltage detector (6) output signal frequency for f
cthe sine wave output signal frequency of Shi Suoshu sinusoidal signal generator (1) is initial value, the frequency of described sine wave signal is raised with 1MHz step-length, and ensure that described sine wave signal voltage magnitude is constant, find out described tested transient earth voltage detector (6) normalization exporting change to 0.501 time Frequency point, described exporting change to 0.501 time Frequency point be the upper cut-off frequency f of the actual measurement of described tested transient earth voltage detector (6)
on;
Step S105, the upper cut-off frequency f of the described actual measurement of the described tested transient earth voltage detector (6) obtained according to described step S103 and step S104
onwith lower-cut-off frequency f
under, try to achieve the frequency band of described tested transient earth voltage detector (6), calculate described tested transient earth voltage detector (6) upper cut-off frequency f
onwith lower-cut-off frequency f
undererror delta f
onwith Δ f
underbe respectively Δ f
on=[(f
on-f
b)/f] × 100%, Δ f
under=[(f
under-f
b)/f] × 100%;
Wherein: f
bfor the nominal cutoff frequency of described tested transient earth voltage detector, f
on, f
underand f
bunit be Hz.
8. test a method for partial discharge transient earth voltage detector performance, it is characterized in that, described method, based on system as claimed in claim 2, tests the linearity error of described transient earth voltage detector (6); Comprise:
S201, arranges sinusoidal signal frequency that described sinusoidal signal generator (1) exports and is fixed as a certain frequency values between 3MHz ~ 50MHz;
S202, the amplitude of the described sine wave signal regulating described sinusoidal signal generator (1) to export makes the response of described transient earth voltage detector (6) be more than or equal to 30dB, and records crest voltage U and described transient earth voltage detector (6) the full scale value A of described sinusoidal signal generator (1);
S203, reduces described sinusoidal signal generator (1) amplitude successively to λ U, and λ=0.8,0.6,0.4,0.2 records the corresponding indicating value A that described transient earth voltage detector (6) exports respectively
λ;
S204, calculate λ=0.8,0.6,0.4, the linearity error of each measurement point of 0.2
9. test a method for partial discharge transient earth voltage detector performance, it is characterized in that, described method, based on system as claimed in claim 3, is tested the step-by-step counting measuring error of described transient earth voltage detector (6), being comprised:
S301, arranges described pulse signal generator (8) output pulse signal, changes the voltage magnitude of the pulse signal of described output, makes the reading of described transient earth voltage detector (6) be more than or equal to 20dB;
S302, the repetition frequency of the described pulse signal regulating described pulse signal generator (8) to export is one or more selectable value in 0.5kHz ~ 10kHz, observes simultaneously and records the counted number of pulses reading nx of described transient earth voltage detector (6) and the actual pulse number n set by described pulse signal generator (8);
S303, calculates step-by-step counting the measuring error δ=[(n of described tested transient earth voltage detector (6)
x-n)/n] × 100%.
10. test a method for partial discharge transient earth voltage detector performance, it is characterized in that, described method, based on system as claimed in claim 3, is tested the stability error of described transient earth voltage detector (6), being comprised:
S401, arranges the square-wave signal that described pulse signal generator (8) exports constant amplitude, frequency;
S402, described transient earth voltage detector (6) start continuous working 1 hour, records the response of described transient earth voltage detector (6) from just start to continuous working after 1 hour;
S403, calculates the stability of described tested transient earth voltage detector (6) by mistake
Wherein: x
1for response during the just start of described tested transient earth voltage detector (6), x2 is the response of described tested transient earth voltage detector (6) continuous working after 1 hour,
for the just start of described tested transient earth voltage detector (6) is to the mean value of the response of continuous working after 1 hour.
11. 1 kinds of methods of testing partial discharge transient earth voltage detector performance, it is characterized in that, described method, based on system as claimed in claim 4, is tested the positioning function of described transient earth voltage detector (6), being comprised:
S501, arrange described two the TEV sensors (5) on described transient earth voltage detector (6), the detection and localization distance making the distance of described two sensors (5) be greater than described transient earth voltage detector (6) to specify;
S502, arranges described pulse signal generator (8) and exports the pulse signal of constant amplitude, regulates the pulse repetition frequency of described output to be a certain value between 50Hz ~ 10kHz;
Whether S503, check from the described TEV sensor (5) close to described pulse signal generator (8) and be triggered.
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