CN218512613U - Calibration platform of cable oscillatory wave partial discharge detection device - Google Patents
Calibration platform of cable oscillatory wave partial discharge detection device Download PDFInfo
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- CN218512613U CN218512613U CN202222401021.7U CN202222401021U CN218512613U CN 218512613 U CN218512613 U CN 218512613U CN 202222401021 U CN202222401021 U CN 202222401021U CN 218512613 U CN218512613 U CN 218512613U
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Abstract
The utility model relates to a partial discharge detection technical field discloses a cable oscillatory wave partial discharge detection device's check-up platform, applys impulse voltage to the cable under test through waveform signal generator, measures the first oscillatory voltage waveform of the cable under test to charge load capacitor, still pour into the discharge pulse of presetting the electric charge amount into load capacitor through the calibrator, obtain first partial discharge amount; the partial discharge detection device for the oscillating wave of the cable to be detected acquires a second oscillating voltage waveform and a second partial discharge quantity of the cable to be detected in advance, and the partial discharge detection device for the oscillating wave of the cable to be detected is verified according to a comparison result of the first oscillating voltage waveform and the second oscillating voltage waveform and a comparison result of the first partial discharge quantity and the second partial discharge quantity, so that the verification accuracy of the partial discharge detection device for the oscillating wave of the cable to be detected is improved.
Description
Technical Field
The utility model relates to a detection technology field is put in the office, especially relates to a detection device's check-up platform is put in cable oscillatory wave office.
Background
The standards promulgated by the international electrotechnical commission define the detection methods and contents of the cable alternating current partial discharge, the direct current partial discharge and the oscillation wave partial discharge, and the research contents of various research institutions and scholars take the standards as the core. The method mainly comprises the following steps: the definition of terms and parameters such as partial discharge, oscillation wave, discharge starting voltage, discharge extinguishing voltage, apparent discharge amount and the like; requirements for a partial discharge detector; forming a test loop; calibration of the measurement system in the complete test loop, etc.
The calibration in the prior art is only to calibrate and calibrate the partial discharge current pulse discharge amount detected by the test equipment, and the calibration of the partial discharge detection device still has the problem of low accuracy.
SUMMERY OF THE UTILITY MODEL
The utility model provides a detection device's check-up platform is put in cable oscillatory wave office has solved the lower technical problem of accuracy to partial discharge detection device's check-up.
In view of this, the utility model discloses the first aspect provides a detection device's check-up platform is put in cable oscillatory wave office is applied to and puts detection device to the cable oscillatory wave office that awaits measuring and check-up, the cable oscillatory wave office that awaits measuring is put detection device and is connected with the cable of being surveyed, include: the device comprises a waveform signal generator, a first voltage divider, a signal acquisition card, a load capacitor, a calibrator and a PC (personal computer) end;
the first end of the waveform signal generator, the first end of the first voltage divider and the first end of the load capacitor are connected in parallel to the high-voltage output end of the tested cable, the second end of the waveform signal generator, the second end of the first voltage divider and the second end of the load capacitor are grounded, the waveform signal generator is used for applying pulse voltage to the tested cable, and the first voltage divider is used for measuring a first oscillating voltage waveform of the tested cable; the load capacitor is used for charging through the voltage output by the tested cable;
the calibrator is connected with the load capacitor and is used for injecting a discharge pulse with a preset charge amount into the load capacitor to obtain a first local discharge amount;
the signal acquisition card is respectively connected with the first voltage divider, the calibrator, the to-be-tested cable oscillatory wave partial discharge detection device and the PC end, and is used for acquiring a first oscillatory voltage waveform and a first local discharge amount which respectively correspond to the first voltage divider and the calibrator, acquiring a second oscillatory voltage waveform and a second local discharge amount of the to-be-tested cable oscillatory wave partial discharge detection device, and sending the first oscillatory voltage waveform, the first local discharge amount, the second oscillatory voltage waveform and the second local discharge amount to the PC end;
and the PC end is used for verifying the partial discharge detection device of the oscillating wave of the cable to be detected according to the comparison result of the first oscillating voltage waveform and the second oscillating voltage waveform and the comparison result of the first partial discharge amount and the second partial discharge amount.
Preferably, the calibrator comprises a pulse generator unit, a display unit, a main control unit, a signal amplification unit and a wireless communication unit;
the main control unit is respectively connected with the pulse generator unit, the display unit and the wireless communication unit, the pulse generator unit is connected with the signal amplification unit, the signal amplification unit is connected with the load capacitor, and the wireless communication unit is electrically connected with the signal acquisition card.
Preferably, the present platform further comprises: and the oscilloscope is used for displaying the first oscillating voltage waveform.
Preferably, the present platform further comprises: and the printer is connected with the PC end.
Preferably, the device for detecting partial discharge of oscillating waves of the cable to be detected comprises: the power supply comprises a second voltage divider, a PD coupler, a filter and a display, wherein the second voltage divider is electrically connected with the PD coupler, the PD coupler is electrically connected with the filter, and the filter is electrically connected with the display.
According to the technical solution provided by the utility model, the utility model has the advantages of it is following:
the utility model applies pulse voltage to the tested cable through the waveform signal generator, measures the first oscillating voltage waveform of the tested cable, charges the load capacitor, and injects the discharging pulse with the preset charge quantity into the load capacitor through the calibrator to obtain the first local discharging quantity; the method comprises the steps that a first oscillating voltage waveform and a first partial discharge quantity of a cable to be detected are acquired by the partial discharge detection device of the oscillating wave of the cable to be detected in advance, and the partial discharge detection device of the oscillating wave of the cable to be detected is checked according to a comparison result of the first oscillating voltage waveform and the second oscillating voltage waveform and a comparison result of the first partial discharge quantity and the second partial discharge quantity, so that the checking accuracy of the partial discharge detection device of the oscillating wave of the cable to be detected is improved.
Drawings
Fig. 1 is a schematic structural diagram of a calibration platform of a cable oscillatory wave partial discharge detection apparatus according to an embodiment of the present invention;
fig. 2 is a waveform diagram of the charging voltage and the oscillating wave voltage pulse provided by the embodiment of the present invention;
fig. 3 is a schematic structural diagram of an aligner according to an embodiment of the present invention;
fig. 4 is the embodiment of the utility model provides a detection device is put in cable oscillatory wave office that awaits measuring's structure schematic diagram.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
For convenience of understanding, please refer to fig. 1, the verification platform for the cable oscillatory wave partial discharge detection apparatus provided by the present invention is applied to verify a to-be-detected cable oscillatory wave partial discharge detection apparatus 10, where the to-be-detected cable oscillatory wave partial discharge detection apparatus 10 is connected to a to-be-detected cable, and includes: the signal processing device comprises a waveform signal generator 100, a first voltage divider 200, a signal acquisition card 300, a load capacitor 400, a calibrator 500 and a PC (personal computer) end 600;
a first end of the waveform signal generator 100, a first end of the first voltage divider 200 and a first end of the load capacitor 400 are connected in parallel to a high-voltage output end of the tested cable 20, a second end of the waveform signal generator 100, a second end of the first voltage divider 200 and a second end of the load capacitor 400 are all grounded, the waveform signal generator 100 is used for applying pulse voltage to the tested cable 20, and the first voltage divider 200 is used for measuring a first oscillating voltage waveform of the tested cable 20; the load capacitor 400 is used for charging through the voltage output by the tested cable 20;
the waveform signal generator 100 can output the pulse voltage to the cable 20 to be measured based on the preset pulse voltage, such as sine waveform pulse voltage, the waveform signal generator 100 can customize any waveform signal and can generate no less than four groups of double-pulse signals, which can be used for multi-source partial discharge positioning, and when the pulse voltage is input to the cable 20 to be measured, a partial discharge phenomenon can be generated at the defect position of the cable 20 to be measured, so as to generate an oscillating voltage signal.
The calibrator 500 is connected to the load capacitor 400, and is configured to inject a discharge pulse of a preset charge amount into the load capacitor 400 to obtain a first local discharge amount;
the calibrator 500 is configured to set parameters in advance according to an international standard, and periodically calibrate the calibrator 500. The gears of the calibrator 500 include 20nC,10nC,5nC,1nC,500pC, 100pC-20pC, and 20pC-1 pC, and can be selected specifically.
In one example, with the load capacitor 400 as a load, a discharge pulse of a known amount of charge is injected into the load capacitor 400 through the calibrator 500, thereby discharging the load capacitor 400.
The signal acquisition card 300 is connected to the first voltage divider 200, the calibrator 500, the to-be-tested cable oscillatory wave partial discharge detection apparatus 10, and the PC terminal 600, and is configured to acquire a first oscillatory voltage waveform and a first local discharge amount corresponding to the first voltage divider 200 and the calibrator 500, respectively, acquire a second oscillatory voltage waveform and a second local discharge amount, which are acquired by the to-be-tested cable oscillatory wave partial discharge detection apparatus 10 in advance, of the to-be-tested cable 20, and send the first oscillatory voltage waveform, the first local discharge amount, the second oscillatory voltage waveform, and the second local discharge amount to the PC terminal 600;
the PC end 600 is configured to verify the partial discharge detection device 10 for the cable oscillating wave to be detected according to a comparison result of the first oscillating voltage waveform and the second oscillating voltage waveform and a comparison result of the first partial discharge amount and the second partial discharge amount.
Specifically, the present embodiment may complete the following three verification processes:
1) Verification of the oscillating voltage waveform: after the first oscillating voltage waveform and the second oscillating voltage waveform are obtained, corresponding oscillating frequency and amplitude attenuation can be respectively decomposed in the first oscillating voltage waveform and the second oscillating voltage waveform, as shown in fig. 2, the charging voltage and the oscillating wave voltage pulse waveform during verification are shown as schematic diagrams, the first oscillating voltage waveform can be used as a standard waveform, the first oscillating voltage waveform is used as a comparison reference waveform, the waveform similarity between the second oscillating voltage waveform and the first oscillating voltage waveform is judged, if the waveform similarity is greater than a preset similarity threshold value, the oscillating wave collection of the cable oscillating wave partial discharge detection device 10 to be detected is qualified, otherwise, the oscillating wave collection of the cable oscillating wave partial discharge detection device 10 to be detected is unqualified. Or, directly comparing the oscillation frequency and the amplitude attenuation between the two waveforms, and judging whether the oscillation wave acquisition of the cable oscillation wave partial discharge detection device 10 to be detected is qualified or not according to the difference value.
2) And (4) local discharge amount checking: injecting discharge pulses with known charge quantity into the load capacitor 400 through the calibrator 500 to obtain discharge quantity, comparing a difference value between the first local discharge quantity and the second local discharge quantity, if the difference value between the first local discharge quantity and the second local discharge quantity is smaller than a preset difference value, the partial discharge acquisition of the cable oscillatory wave partial discharge detection device 10 to be detected is qualified, otherwise, the partial discharge acquisition of the cable oscillatory wave partial discharge detection device 10 to be detected is unqualified, and thus, the partial discharge measurement error and the partial discharge measurement sensitivity of the cable oscillatory wave partial discharge detection device 10 to be detected are judged.
3) Partial discharge positioning verification: the verification content of the partial discharge positioning comprises positioning sensitivity, positioning error and multi-source partial discharge positioning performance. The calibrator 500 injects a pulse signal of 100pC charges into the cable to be measured, gradually reduces the amount of injected charges, and records the minimum amount of injected charges Qmin when the reflected wave signal cannot be measured.
The partial discharge localization sensitivity S can be calculated as follows: s = Qmin × e ^ (Fs-F)
Where Fs is the typical attenuation magnitude for a 100m long cable, and a value of 0.7, f indicates the attenuation magnitude of the cable under test.
In one embodiment, as shown in fig. 3, the calibrator includes a pulse generator unit 501, a display unit 502, a main control unit 503, a signal amplification unit 504, and a wireless communication unit 505;
the main control unit 503 is respectively connected with the pulse generator unit 501, the display unit 502 and the wireless communication unit 505, the pulse generator unit 501 is connected with the signal amplification unit 504, the signal amplification unit 504 is connected with the load capacitor, and the wireless communication unit 505 is electrically connected with the signal acquisition card 300.
It can be understood that, after the main control unit 503 controls the magnitude of the pulse voltage signal output by the pulse generator unit 501, the signal amplification unit 504 amplifies the pulse voltage signal and outputs the amplified pulse voltage signal to the load capacitor, and the display unit 502 displays the pulse voltage signal, and simultaneously, sends the pulse voltage signal and the partial discharge amount to the signal acquisition card 300 through the wireless communication unit 505.
In one embodiment, the present platform further comprises: and the oscilloscope is used for displaying the first oscillating voltage waveform.
In one embodiment, the present platform further comprises: and the printer is connected with the PC end.
The printer can print a detection report according to the comparison and analysis result to realize one-key verification.
In an embodiment, as shown in fig. 4, the device for detecting partial discharge of oscillating wave of a cable to be tested includes: the device comprises a second voltage divider 11, a PD coupler 12, a filter 13 and a display 14, wherein the second voltage divider 11 is electrically connected with the PD coupler 12, the PD coupler 12 is electrically connected with the filter 13, and the filter 13 is electrically connected with the display 14.
The second voltage divider 11 may divide a high voltage signal of the oscillating voltage signal into a low voltage signal, couple the partial discharge signal out of the oscillating voltage signal through the PD coupler 12, filter the low voltage signal and the partial discharge signal through the filter 13, and display the low voltage signal and the partial discharge signal through the display 14.
According to the verification platform of the cable oscillatory wave partial discharge detection device provided by the embodiment, the waveform signal generator applies pulse voltage to the cable to be detected, the first oscillatory voltage waveform of the cable to be detected is measured, the load capacitor is charged, and the calibrator injects discharge pulse with preset charge quantity to the load capacitor to obtain first local discharge quantity; the partial discharge detection device for the oscillating wave of the cable to be detected acquires a second oscillating voltage waveform and a second partial discharge quantity of the cable to be detected in advance, and the partial discharge detection device for the oscillating wave of the cable to be detected is verified according to a comparison result of the first oscillating voltage waveform and the second oscillating voltage waveform and a comparison result of the first partial discharge quantity and the second partial discharge quantity, so that the verification accuracy of the partial discharge detection device for the oscillating wave of the cable to be detected is improved.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (5)
1. The utility model provides a detection device's check-up platform is put in cable oscillatory wave office is applied to and checks up the detection device is put in the cable oscillatory wave office that awaits measuring, the detection device is put in the cable oscillatory wave office that awaits measuring and is connected with the cable of being surveyed, its characterized in that includes: the device comprises a waveform signal generator, a first voltage divider, a signal acquisition card, a load capacitor, a calibrator and a PC (personal computer) end;
the first end of the waveform signal generator, the first end of the first voltage divider and the first end of the load capacitor are connected into the high-voltage output end of the tested cable in parallel, the second end of the waveform signal generator, the second end of the first voltage divider and the second end of the load capacitor are all grounded, the waveform signal generator is used for applying pulse voltage to the tested cable, and the first voltage divider is used for measuring a first oscillating voltage waveform of the tested cable; the load capacitor is used for charging through the voltage output by the tested cable;
the calibrator is connected with the load capacitor and is used for injecting a discharge pulse with a preset charge amount into the load capacitor to obtain a first local discharge amount;
the signal acquisition card is respectively connected with the first voltage divider, the calibrator, the to-be-tested cable oscillatory wave partial discharge detection device and the PC end, and is used for acquiring a first oscillatory voltage waveform and a first local discharge amount which respectively correspond to the first voltage divider and the calibrator, acquiring a second oscillatory voltage waveform and a second local discharge amount of the to-be-tested cable oscillatory wave partial discharge detection device, and sending the first oscillatory voltage waveform, the first local discharge amount, the second oscillatory voltage waveform and the second local discharge amount to the PC end;
and the PC terminal is used for verifying the partial discharge detection device of the oscillating wave of the cable to be detected according to the comparison result of the first oscillating voltage waveform and the second oscillating voltage waveform and the comparison result of the first partial discharge amount and the second partial discharge amount.
2. The calibration platform of the cable oscillatory wave partial discharge detection device according to claim 1, wherein the calibrator comprises a pulse generator unit, a display unit, a main control unit, a signal amplification unit and a wireless communication unit;
the main control unit is respectively connected with the pulse generator unit, the display unit and the wireless communication unit, the pulse generator unit is connected with the signal amplification unit, the signal amplification unit is connected with the load capacitor, and the wireless communication unit is electrically connected with the signal acquisition card.
3. The verification platform for the cable oscillatory wave partial discharge detection apparatus according to claim 1, further comprising: and the oscilloscope is used for displaying the first oscillating voltage waveform.
4. The verification platform for the cable oscillatory wave partial discharge detection apparatus according to claim 1, further comprising: and the printer is connected with the PC end.
5. The verification platform of the cable oscillatory wave partial discharge detection device according to claim 1, wherein the cable oscillatory wave partial discharge detection device to be tested comprises: the second voltage divider is electrically connected with the PD coupler, the PD coupler is electrically connected with the filter, and the filter is electrically connected with the display.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222401021.7U CN218512613U (en) | 2022-09-09 | 2022-09-09 | Calibration platform of cable oscillatory wave partial discharge detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222401021.7U CN218512613U (en) | 2022-09-09 | 2022-09-09 | Calibration platform of cable oscillatory wave partial discharge detection device |
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| CN218512613U true CN218512613U (en) | 2023-02-21 |
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| CN202222401021.7U Active CN218512613U (en) | 2022-09-09 | 2022-09-09 | Calibration platform of cable oscillatory wave partial discharge detection device |
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