CN105353328A - GIS partial discharge UHF sensor equivalent height sweeping frequency reference calibration method - Google Patents
GIS partial discharge UHF sensor equivalent height sweeping frequency reference calibration method Download PDFInfo
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- CN105353328A CN105353328A CN201510788661.XA CN201510788661A CN105353328A CN 105353328 A CN105353328 A CN 105353328A CN 201510788661 A CN201510788661 A CN 201510788661A CN 105353328 A CN105353328 A CN 105353328A
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- 238000010408 sweeping Methods 0.000 title abstract 5
- 239000000523 sample Substances 0.000 claims abstract description 43
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 230000006870 function Effects 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 8
- 230000004044 response Effects 0.000 claims description 7
- 230000005684 electric field Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000007639 printing Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 abstract description 6
- 238000007430 reference method Methods 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention discloses a GIS partial discharge UHF sensor equivalent height sweeping frequency reference calibration method. Firstly a calibration platform composed of a GTEM cell, a sweeping frequency signal source, a high-speed digital oscilloscope, a single-pole standard probe, a sensor to be tested, a measurement and control computer, calibration software and various cable accessories is established; continuous sine wave voltage signals of fixed amplitude are injected in the GTEM cell via the sweeping frequency signal source, the output ports of the single-pole standard probe and the sensor to be tested are respectively connected with the measurement port of the oscilloscope, and the voltage signals coupled by the single-pole standard probe and the sensor to be tested are acquired in real time via calibration software; and the frequency domain equivalent height curve of the sensor to be tested is calculated according to a sweeping frequency reference method. The method has clear principle and can effectively measure the equivalent height curve of a GIS partial discharge UHF sensor; degree of integration is high and operation is simple and convenient; and measurement precision is high, intermediate error generated by performing FFT transform on time domain pulse signals can be eliminated, and scientific evaluation of coupling performance of the GIS partial discharge UHF sensor can be realized.
Description
Technical field
The invention belongs to converting equipment state-detection field, the service check problem of main research GIS partial discharge type UHF sensor, is specially a kind of frequency sweep of GIS partial discharge type UHF sensor equivalent height with reference to scaling method.
Background technology
At present, GIS partial discharge type UHF sensor lacks effectively unified scaling method, and the GIS partial discharge UHF caused thus detects inefficacy example and gets more and more, and seriously constrains the sound development of GIS partial discharge UHF detection industry.For this reason, scientific and reasonable GIS partial discharge type UHF sensor scaling method must be set up, form relevant Product Specifications, objective evaluation is carried out to the GIS partial discharge type UHF sensor networked.
Equivalent height measurement based on time domain impulse reference method is a kind of scaling method that current GIS partial discharge type UHF sensor is most widely used.One pole standard probe is placed at gtem cell test window place, open Pulse Calibration signal source, output pulse signal is to gtem cell, set up pulse electromagnetic field, reasonable disposition oscillograph, record and preserve the voltage waveform that one pole standard probe exports, carrying out FFT conversion, obtain the amplitude-frequency response characteristic of one pole standard probe; At gtem cell test window, one pole standard probe is replaced by sensor to be measured by place, reasonable disposition oscillograph, record and preserve sensor to be measured export voltage waveform, carry out FFT conversion, obtain the amplitude-frequency response characteristic of sensor to be measured; Based on time domain impulse with reference to method, calculate the frequency domain equivalent height curve of sensor to be measured.
Prior art mainly based on time domain impulse reference method, has following deficiency:
1, the UHF electromagnetic wave signal that pulse signal source gives off should be suitable with the UHF signal of shelf depreciation, local discharge signal has randomness, how to determine that the parameter of pulse signal source is crucial and one of difficulties, the parameters such as the output amplitude of pulse signal source and rise time cannot Efficient Evaluation on the impact of type UHF sensor equivalent height calibration result;
2, FFT conversion is carried out to time domain voltage waveforms, median error may be brought to the calibration result of type UHF sensor equivalent height.
Summary of the invention
The object of this invention is to provide a kind of frequency sweep of GIS partial discharge type UHF sensor equivalent height with reference to scaling method, the performance of energy objective evaluation GIS partial discharge type UHF sensor, realizes networking and the periodic inspection of GIS partial discharge type UHF sensor.
The present invention adopts following scheme to realize: a kind of frequency sweep of GIS partial discharge type UHF sensor equivalent height is with reference to scaling method, it is characterized in that, comprise the following steps: step S1: set up a GIS partial discharge type UHF sensor equivalent height calibrating platform be made up of gtem cell, swept signal source, high speed digital oscilloscope, one pole standard probe, sensor to be measured, Measurement &control computer, calibration software and various cable accessories; Step S2: injecting amplitude by swept signal source in gtem cell is U
icontinuous sine wave voltage signal, respectively the output port of one pole standard probe and sensor to be measured is connected to oscillographic measurement port, and by voltage signal that the calibration software Real-time Collection one pole standard probe and sensors coupled to be measured being arranged on described Measurement &control computer arrives; Step S3: the frequency domain equivalent height curve calculating sensor to be measured according to frequency sweep with reference to method.
In an embodiment of the present invention, the important technological parameters of described gtem cell is: frequency range 0-2GHz; Input impedance 50 Ω; Voltage standing wave ratio (VSWR)≤1.5; Work field strength range 0.5 μ V/m-10V/m; Specification 4200mm × 2200mm × 1400mm; Described sensor test window to be measured is positioned at more uniform region, 1/3rd magnetic fields behind gtem cell top, opening diameter >=150mm.
In an embodiment of the present invention, the important technological parameters of described swept signal source is: frequency range 10kHz-2GHz; Output impedance 50 Ω; Peak power output >=10dBm; Outputting standard sine wave.
In an embodiment of the present invention, the important technological parameters of described high speed digital oscilloscope is: analog bandwidth >=2GHz; Sampling rate >=20Gs/s.
In an embodiment of the present invention, the recommendation specification of described one pole standard probe is: radius r=0.65mm; Height h=25mm.
In an embodiment of the present invention, the Specifeca tion speeification of described Measurement &control computer is: dominant frequency >=1G; Internal memory >=2G; Operating system is WindowsXP and higher system.
In an embodiment of the present invention, described calibration software adopts Labview exploitation, to be set up with swept signal source by serial ports control line and communicate, to be set up with high speed digital oscilloscope by netting twine and communicate, perform the frequency sweep and oscillograph acquisition parameter that configure in calibration software, control swept signal source and carry out frequency sweep according to the parameter of setting, high speed digital oscilloscope collection one pole standard probe and type UHF sensor to be measured export the voltage signal magnitude of each Frequency point, and then calculate the equivalent height of type UHF sensor frequency domain with reference to method according to frequency sweep, display, preservation and printing test result.
In an embodiment of the present invention, described frequency sweep with reference to method realize principle and step is as follows: step S31: adopt frequency domain equivalent height to demarcate the coupling performance of type UHF sensor, its value is sensor output voltage U
o(f) and incident electric fields E
ithe ratio of (f), namely
step S32: by demarcating swept signal source injecting voltage U
ito gtem cell, set up electric field E in gtem cell inside
i, the voltage that one pole standard probe and tested sensors coupled export is respectively U
orand U
os, the voltage exported after measuring system is respectively U
mrand U
ms; Step S33: set the transport function of gtem cell as H
cell, the transport function of one pole standard probe is H
ref, the transport function of sensor to be measured is H
sens, the transmission characteristic of measuring system is H
sys, then the measuring system of one pole standard probe and sensor to be measured exports and can be expressed as:
Can derive thus and obtain
By measuring sensor to be measured and the Frequency Response of one pole standard probe under same voltage, and according to the equivalent height of one pole standard probe, calculate the equivalent height of sensor to be measured.
Compared with prior art, the present invention program has the following advantages and beneficial effect:
1, realize clear principle, clearly, effectively can measure the equivalent height curve of GIS partial discharge type UHF sensor;
2, software intensive degree is high, and platform operations is easy;
3, measuring accuracy is high, swept-frequency signal source stability is high, eliminate the parameter such as output amplitude and rise time of pulse signal source to the impact of type UHF sensor equivalent height calibration result, and time-domain signal is carried out to the median error of FFT conversion generation, the scientific evaluation of GIS partial discharge type UHF sensor coupling performance can be realized.
Accompanying drawing explanation
Fig. 1 is the inventive method key wiring diagram.
Fig. 2 is the calibration result of a type UHF sensor equivalent height curve in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
The present invention injects the certain continuous sine wave voltage signal of amplitude by swept signal source in gtem cell, respectively the output port of one pole standard probe and sensor to be measured is connected to oscillographic measurement port, by the voltage signal that software Real-time Collection one pole standard probe and sensors coupled to be measured arrive, calculate the frequency domain equivalent height curve of sensor to be measured with reference to method according to frequency sweep.
Concrete steps are as follows:
Step S1: set up the GIS partial discharge type UHF sensor equivalent height calibrating platform be made up of gtem cell, swept signal source, high speed digital oscilloscope, one pole standard probe, sensor to be measured, Measurement &control computer, calibration software and various cable accessories etc., as shown in Figure 1.
Step S2: the continuous sine wave voltage signal being injected amplitude certain (amplitude is UI) by swept signal source in gtem cell, respectively the output port of one pole standard probe and sensor to be measured is connected to oscillographic measurement port, reasonable disposition oscillograph, the voltage signal arrived by the software Real-time Collection one pole standard probe and sensors coupled to be measured being arranged on measure and calculation machine; Step S3: the frequency domain equivalent height curve calculating sensor to be measured according to frequency sweep with reference to method.
The important technological parameters of described swept signal source is: frequency range 10kHz-2GHz; Output impedance 50 Ω; Peak power output >=10dBm; Outputting standard sine wave.The important technological parameters of described high speed digital oscilloscope is: analog bandwidth >=2GHz; Sampling rate >=20Gs/s.The recommendation specification of described one pole standard probe is: radius r=0.65mm; Height h=25mm.The Specifeca tion speeification of described Measurement &control computer is: dominant frequency >=1G; Internal memory >=2G; Operating system is WindowsXP and higher system.Described calibration software adopts Labview exploitation, to be set up with swept signal source by serial ports control line and communicate, to be set up with high speed digital oscilloscope by netting twine and communicate, perform the frequency sweep and oscillograph acquisition parameter that configure in calibration software, control swept signal source and carry out frequency sweep according to the parameter of setting, high speed digital oscilloscope collection one pole standard probe and type UHF sensor to be measured export the voltage signal magnitude of each Frequency point, and then calculate the equivalent height of type UHF sensor frequency domain with reference to method according to frequency sweep, display, preservation and printing test result.
In an embodiment of the present invention, described frequency sweep with reference to method realize principle and step is as follows: step S31: adopt frequency domain equivalent height to demarcate the coupling performance of type UHF sensor, its value is sensor output voltage U
o(f) and incident electric fields E
ithe ratio of (f), namely
step S32: by demarcating swept signal source injecting voltage U
ito gtem cell, set up electric field E in gtem cell inside
i, the voltage that one pole standard probe and tested sensors coupled export is respectively U
orand U
os, the voltage exported after measuring system is respectively U
mrand U
ms; Step S33: set the transport function of gtem cell as H
cell, the transport function of one pole standard probe is H
ref, the transport function of sensor to be measured is H
sens, the transmission characteristic of measuring system is H
sys, then the measuring system of one pole standard probe and sensor to be measured exports and can be expressed as:
Can derive thus and obtain
By measuring sensor to be measured and the Frequency Response of one pole standard probe under same voltage, and according to the equivalent height of one pole standard probe, calculate the equivalent height of sensor to be measured.
In specific embodiment, carry out test connection according to Fig. 1.The optimum configurations of step S2 comprises the following steps
1) arranging swept signal source output power is 13dBm, initial frequency is 100MHz, and termination frequency is 2.01GHz, and frequency step is 2MHz, interval time, 300ms, injected the certain continuous sine wave voltage signal of amplitude by swept signal source in gtem cell;
2) output port of one pole standard probe is connected to oscillographic measurement port, reasonable disposition oscillograph, run calibration software, the voltage signal of Real-time Collection one pole standard probe, obtains the amplitude-frequency response characteristic U of one pole standard probe
mrand preserve;
3) output port of sensor to be measured is connected to oscillographic measurement port, reasonable disposition oscillograph, run calibration software, the voltage signal of Real-time Collection sensor to be measured, obtains the amplitude-frequency response characteristic U of sensor to be measured
msand preserve;
Run calibration software, software is according to built-in frequency sweep reference method and one pole standard probe equivalent height curve H
ref, calculate the frequency domain equivalent height curve H of sensor to be measured
sens, namely
result as shown in Figure 2.Technical scheme clear principle of the present invention, clear and definite as can be seen from Figure 2, effectively can measure the equivalent height curve of GIS partial discharge type UHF sensor; Measuring accuracy is high, swept-frequency signal source stability is high, eliminate the parameter such as output amplitude and rise time of pulse signal source to the impact of type UHF sensor equivalent height calibration result, and time-domain signal is carried out to the median error of FFT conversion generation, the scientific evaluation of GIS partial discharge type UHF sensor coupling performance can be realized.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (8)
1. the frequency sweep of GIS partial discharge type UHF sensor equivalent height is with reference to a scaling method, it is characterized in that, comprises the following steps:
Step S1: set up a GIS partial discharge type UHF sensor equivalent height calibrating platform be made up of gtem cell, swept signal source, high speed digital oscilloscope, one pole standard probe, sensor to be measured, Measurement &control computer, calibration software and various cable accessories;
Step S2: injecting amplitude by swept signal source in gtem cell is U
icontinuous sine wave voltage signal, respectively the output port of one pole standard probe and sensor to be measured is connected to the oscillographic measurement port of high speed digital oscilloscope, the voltage signal arrived by the calibration software Real-time Collection one pole standard probe and sensors coupled to be measured being installed on described Measurement &control computer;
Step S3: the frequency domain equivalent height curve calculating sensor to be measured according to frequency sweep with reference to method.
2. the frequency sweep of GIS partial discharge type UHF sensor equivalent height according to claim 1 is with reference to scaling method, it is characterized in that:
The important technological parameters of described gtem cell is: frequency range 0-2GHz; Input impedance 50 Ω; Voltage standing wave ratio (VSWR)≤1.5; Work field strength range 0.5 μ V/m-10V/m; Specification 4200mm × 2200mm × 1400mm; Described sensor test window to be measured is positioned at the region of behind gtem cell top 1/3rd, opening diameter >=150mm.
3. the frequency sweep of GIS partial discharge type UHF sensor equivalent height according to claim 1 is with reference to scaling method, it is characterized in that:
The important technological parameters of described swept signal source is: frequency range 10kHz-2GHz; Output impedance 50 Ω; Peak power output >=10dBm; Outputting standard sine wave.
4. the frequency sweep of GIS partial discharge type UHF sensor equivalent height according to claim 1 is with reference to scaling method, it is characterized in that:
The important technological parameters of described high speed digital oscilloscope is: analog bandwidth >=2GHz; Sampling rate >=20Gs/s.
5. the frequency sweep of GIS partial discharge type UHF sensor equivalent height according to claim 1 is with reference to scaling method, it is characterized in that:
The recommendation specification of described one pole standard probe is: radius r=0.65mm; Height h=25mm.
6. the frequency sweep of GIS partial discharge type UHF sensor equivalent height according to claim 1 is with reference to scaling method, it is characterized in that:
The Specifeca tion speeification of described Measurement &control computer is: dominant frequency >=1G; Internal memory >=2G; Operating system is WindowsXP and higher system.
7. the frequency sweep of GIS partial discharge type UHF sensor equivalent height according to claim 1 is with reference to scaling method, it is characterized in that:
Described calibration software adopts Labview exploitation, to be set up with swept signal source by serial ports control line and communicate, to be set up with high speed digital oscilloscope by netting twine and communicate, perform the frequency sweep and oscillograph acquisition parameter that configure in calibration software, control swept signal source and carry out frequency sweep according to the parameter of setting, high speed digital oscilloscope collection one pole standard probe and type UHF sensor to be measured export the voltage signal magnitude of each Frequency point, and then calculate the equivalent height of type UHF sensor frequency domain with reference to method according to frequency sweep, display, preservation and printing test result.
8. the frequency sweep of GIS partial discharge type UHF sensor equivalent height according to claim 1 is with reference to scaling method, it is characterized in that:
Described frequency sweep with reference to method realize principle and step is as follows:
Step S31: adopt frequency domain equivalent height to demarcate the coupling performance of type UHF sensor, its value is sensor output voltage U
o(f) and incident electric fields E
ithe ratio of (f), namely
Step S32: by demarcating swept signal source injecting voltage U
ito gtem cell, set up electric field E in gtem cell inside
i, the voltage that one pole standard probe and tested sensors coupled export is respectively U
orand U
os, the voltage exported after measuring system is respectively U
mrand U
ms;
Step S33: set the transport function of gtem cell as H
cell, the transport function of one pole standard probe is H
ref, the transport function of sensor to be measured is H
sens, the transmission characteristic of measuring system is H
sys, then the measuring system of one pole standard probe and sensor to be measured exports and can be expressed as:
Can derive thus and obtain
By measuring sensor to be measured and the Frequency Response of one pole standard probe under same voltage, and according to the equivalent height of one pole standard probe, calculate the equivalent height of sensor to be measured.
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| CN107656228A (en) * | 2017-09-22 | 2018-02-02 | 中国电力科学研究院 | A kind of the field strength source tracing method and system of the partial-discharge ultrahigh-frequency demarcation based on GTEM |
| CN110398673A (en) * | 2019-08-02 | 2019-11-01 | 南京工业大学 | A kind of virtual emulation platform for high voltage gas discharge manifold effect comprehensive diagnos |
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Effective date of registration: 20170505 Address after: 350003 Gulou District, Fujian, Fuzhou No. 54 Road, No. 257 Applicant after: State Grid Fujian Electric Power Co., Ltd. Applicant after: State Grid Corporation of China Applicant after: Electric Power Research Institute, State Grid Fujian Electric Power Co., Ltd. Applicant after: Fujian EPRI Power Commissioning Co., Ltd. Address before: 350003 Gulou District, Fujian, Fuzhou No. 54 Road, No. 257 Applicant before: State Grid Fujian Electric Power Co., Ltd. Applicant before: State Grid Corporation of China Applicant before: Electric Power Research Institute, State Grid Fujian Electric Power Co., Ltd. |
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