CN104215925A - High-frequency sensor and sensitivity detecting device and method thereof - Google Patents
High-frequency sensor and sensitivity detecting device and method thereof Download PDFInfo
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Abstract
The invention provides a high-frequency sensor and a sensitivity detecting device and method thereof. The device comprises a signal source, a cable and a local discharge detecting device. The signal source transmits a high-frequency signal to the cable according to a preset frequency, the local discharge detecting device monitors the local discharge of the cable through the to-be-detected high-frequency sensor so as to obtain the local discharge signals of the cable, the amplitude of the high-frequency signal transmitted by the signal source is adjusted repeatedly, the signal, corresponding to the lowest amplitude of the high-frequency signal, in the local discharge signals detected by the local discharge detecting device is searched, and the sensitivity of the to-be-detected high-frequency sensor is determined according to the lowest-amplitude signal. The device has the advantages that sensitivity detection of the high-frequency sensor is achieved by the device, the device is simple in structure and detecting method and simple to operate, intermediate link operation and measuring errors are reduced, high-frequency sensor sensitivity detecting precision is increased effectively, and detecting efficiency is increased effectively.
Description
Technical field
The present invention relates to instrument detection technique field, particularly relate to high frequency sensors and sensitivity detector thereof and detection method.
Background technology
Partial Discharge Detection is the effective means of assessment Electric Power Equipment Insulation situation, all needs to carry out high frequency partial discharge examination when wherein the power equipment such as transformer, sleeve pipe, current transformer, voltage transformer (VT), coupling condenser, lightning arrester, cable carries out partial discharge test.High frequency partial discharge detecting technique refers to and gathers the local discharge signal of frequency between 3MHz ~ 30MHz interval, analyze, judges.
But current high frequency sensors sensitivity technique mode/means, performance is very different, the detection means testing process of function admirable is complicated, pick-up unit is expensive, be difficult to apply in actual production life, and general high frequency sensors sensitivity technique mode/means, although testing process is comparatively easy, realize cost comparatively cheap, but its accuracy of detection cannot meet again the requirement of electric power network system.
Summary of the invention
Based on this, being necessary for there is no at present a kind of simple, accurately and the problem of the cheap high frequency sensors sensitivity technique mode of implementation cost, providing a kind of simple, accurately and the cheap high frequency sensors of implementation cost and sensitivity detector thereof and detection method.
A kind of high frequency sensors sensitivity detector, comprises signal source, cable and local discharge detection device;
One end of described cable is connected with described signal source, and described cable passes high frequency sensors to be measured, the other end ground connection of described cable, and described local discharge detection device is connected with described high frequency sensors to be measured;
Described signal source sends high-frequency signal to described cable according to predeterminated frequency, described local discharge detection device is by described high frequency sensors monitoring cable partial discharge phenomenon to be measured, obtain cable local discharge signal, described signal source is repeatedly regulated to send the amplitude of high-frequency signal, searching described local discharge detection device detects in cable local discharge signal, corresponding described signal source sends the signal of minimum amplitude in the amplitude of high-frequency signal, according to the signal of this minimum amplitude, determine the sensitivity of described high frequency sensors to be measured.
A kind of high frequency sensors sensitivity detection method, comprises step:
High-frequency signal is sent to cable, to make cable generation partial discharge phenomenon according to predeterminated frequency;
Monitoring cable partial discharge phenomenon, utilizes local discharge detection device by high frequency sensors to be measured, obtains cable local discharge signal;
Repeatedly regulate the amplitude of described high-frequency signal, search described local discharge detection device and detect that, in cable local discharge signal, correspondence sends the signal of minimum amplitude in the amplitude of high-frequency signal;
According to the signal of this minimum amplitude, determine the sensitivity of described high frequency sensors to be measured.
A kind of high frequency sensors, comprise high frequency sensors body and high frequency sensors sensitivity detector described above, described high frequency sensors body is connected with described high frequency sensors sensitivity detector.
High frequency sensors sensitivity detector of the present invention and detection method, device comprises signal source, cable and local discharge detection device, signal source sends high-frequency signal to cable according to predeterminated frequency, local discharge detection device is by high frequency sensors monitoring cable partial discharge phenomenon to be measured, obtain cable local discharge signal, repeatedly conditioning signal source sends the amplitude of high-frequency signal, searching local discharge detection device detects in cable local discharge signal, respective signal source sends the signal of minimum amplitude in the amplitude of high-frequency signal, according to the signal of this minimum amplitude, determine the sensitivity of described high frequency sensors to be measured.Whole device realizes high frequency sensors sensitivity technique, and its structure and measuring method are simply, easy and simple to handle, reduces operation and the measuring error of intermediate link, effectively raises the sensitivity of measuring high frequency sensors, and effectively improve the work efficiency of detection.
The present invention also provides a kind of high frequency sensors included as above-mentioned high frequency sensors sensitivity detector and high frequency sensors body, and based on above-mentioned same reasons, high frequency sensors of the present invention simply, accurately, independently can realize the detection of sensitivity.
Accompanying drawing explanation
Fig. 1 is the structural representation of high frequency sensors sensitivity detector of the present invention first embodiment;
Fig. 2 is the structural representation of high frequency sensors sensitivity detector of the present invention second embodiment;
Fig. 3 is the schematic flow sheet of high frequency sensors sensitivity detection method of the present invention first embodiment;
Fig. 4 is the schematic flow sheet of high frequency sensors sensitivity detection method of the present invention second embodiment.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below with reference to the accompanying drawings and embodiment, the present invention is further elaborated.Should be appreciated that concrete enforcement described herein is only in order to explain the present invention, does not limit the present invention.
As shown in Figure 1, a kind of high frequency sensors sensitivity detector, comprises signal source 100, cable 200 and local discharge detection device 300;
One end of described cable 200 is connected with described signal source 100, and described cable 200 passes high frequency sensors A to be measured, the other end ground connection of described cable 200, and described local discharge detection device 300 is connected with described high frequency sensors A to be measured;
Described signal source 100 sends high-frequency signal to described cable 200 according to predeterminated frequency, described local discharge detection device 300 is by described high frequency sensors A monitoring cable 200 partial discharge phenomenon to be measured, obtain cable 200 local discharge signal, described signal source 100 is repeatedly regulated to send the amplitude of high-frequency signal, searching described local discharge detection device 300 detects in cable 200 local discharge signal, corresponding described signal source 100 sends the signal of minimum amplitude in the amplitude of high-frequency signal, according to the signal of this minimum amplitude, determine the sensitivity of described high frequency sensors A to be measured.
High frequency refers to the signal of frequency separation at 3MHz ~ 30MHz, and the signal that signal source is sent to cable is the adjustable high-frequency signal of a kind of amplitude, and predeterminated frequency can adjusting at needs according to actual conditions in the frequency separation of 3MHz ~ 30MHz.During whole high frequency sensors sensitivity detector work, signal source sends the adjustable high-frequency signal of amplitude to cable with the frequency set, cable other end ground connection and through high frequency sensors A to be measured, cable is when the high-frequency signal that amplitude is adjustable is transferred to the earth, cable local discharge phenomenon can be there is, when the high frequency signal amplitude value that the amplitude that signal source sends is adjustable is greater than certain threshold value, local discharge detection device can collect cable local discharge signal by high frequency sensors A to be measured, the repeatedly amplitude of conditioning signal source output signal, local discharge detection device gathers the cable local discharge signal of different amplitude, and record the amplitude of different cable local discharge signal respective signal source output signal, searching local discharge detection device detects in cable local discharge signal, respective signal source sends the signal of minimum amplitude in the amplitude of high-frequency signal, according to the signal of this minimum amplitude, determine the sensitivity of described high frequency sensors A to be measured.
High frequency sensors sensitivity detector of the present invention, comprise signal source, cable and local discharge detection device, signal source sends high-frequency signal to cable according to predeterminated frequency, local discharge detection device is by high frequency sensors monitoring cable partial discharge phenomenon to be measured, obtain cable local discharge signal, repeatedly conditioning signal source sends the amplitude of high-frequency signal, searching local discharge detection device detects in cable local discharge signal, respective signal source sends the signal of minimum amplitude in the amplitude of high-frequency signal, according to the signal of this minimum amplitude, determine the sensitivity of described high frequency sensors to be measured.Whole device realizes high frequency sensors sensitivity technique, and its structure and measuring method are simply, easy and simple to handle, reduces operation and the measuring error of intermediate link, effectively raises the sensitivity of measuring high frequency sensors, and effectively improve the work efficiency of detection.
As shown in Figure 2, wherein in an embodiment, described high frequency sensors sensitivity detector also comprises protective resistance 400, and described cable 200 is by described protective resistance 400 ground connection.
Protective resistance mainly plays a protective role, and can realize the resistance of input and output device and being connected of circuit remainder, adding of protective resistance simultaneously, effectively can improve high frequency sensors sensitivity detector safety and reliability of the present invention.
Wherein in an embodiment, local discharge detection device is Analysis of Partial Discharge instrument.
When electrical equipment produces shelf depreciation, can generate electromagnetic waves, electromagnetic wave can generate the voltage-to-ground signal of a transient state when outwards propagating.Analysis of Partial Discharge instrument can effectively gather cable local discharge signal, and effectively analyzes cable local discharge signal, guarantees the accurate of data results.
Wherein in an embodiment, the predeterminated frequency interval value that signal source sends high-frequency signal is 3MHz ~ 30MHz.
3MHz ~ 30MHz scope is the high-frequency range of standards and norms.
Wherein in an embodiment, described local discharge detection device is spectrum analyzer.
Spectrum analyzer is the instrument of research electric signal spectrum structure, for the measurement of the signal parameters such as signal distortion, percentage modulation spectral purity, frequency stability and crosstalk, can, in order to some parameter of the Circuits System such as measuring amplifier and wave filter, be a kind of multiduty electronic measuring instrument.Spectrum analyzer can be analyzed by the more profound cable local discharge signal to gathering, and improves accuracy and the precision of signal analysis result.
Wherein in an embodiment, the resistance of described protective resistance is 50 ohm.
As shown in Figure 3, a kind of high frequency sensors sensitivity detection method, comprises step:
S100: send high-frequency signal to cable, to make cable generation partial discharge phenomenon according to predeterminated frequency.
Signal source sends the adjustable high-frequency signal of amplitude to cable according to the frequency pre-set, cable generation partial discharge phenomenon.
S200: monitoring cable partial discharge phenomenon, utilizes local discharge detection device by high frequency sensors to be measured, obtains cable local discharge signal.
Cable local discharge detection device can monitoring cable partial discharge phenomenon, and gathers cable local discharge signal.
S300: the amplitude repeatedly regulating described high-frequency signal, searches described local discharge detection device and detects that, in cable local discharge signal, correspondence sends the signal of minimum amplitude in the amplitude of high-frequency signal.
Repeatedly regulate the amplitude stating high-frequency signal, local discharge detection device can obtain the signal of cable local discharge under different amplitude effect, analyze these data, the amplitude can finding out high-frequency signal clearly and the corresponding relation collected between cable local discharge signal, again owing to having high-frequency signal more only when amplitude meets certain condition, could be detected by high frequency sensors to be measured by cable local discharge detection device, detect in cable local discharge signal so need to search local discharge detection device here, correspondence sends the signal of minimum amplitude in the amplitude of high-frequency signal.
S400: according to the signal of this minimum amplitude, determines the sensitivity of described high frequency sensors to be measured.
High frequency sensors sensitivity detection method of the present invention, signal source sends high-frequency signal to cable according to predeterminated frequency, local discharge detection device is by high frequency sensors monitoring cable partial discharge phenomenon to be measured, obtain cable local discharge signal, repeatedly conditioning signal source sends the amplitude of high-frequency signal, searching local discharge detection device detects in cable local discharge signal, respective signal source sends the signal of minimum amplitude in the amplitude of high-frequency signal, according to the signal of this minimum amplitude, determine the sensitivity of described high frequency sensors to be measured.Whole process implementation high frequency sensors sensitivity technique, measuring method is simple, easy and simple to handle, reduces operation and the measuring error of intermediate link, effectively raises the sensitivity of measuring high frequency sensors, and effectively improve the work efficiency of detection.
As shown in Figure 4, wherein in an embodiment, step S300 specifically comprises step:
S320: keep described predeterminated frequency constant, repeatedly regulate the amplitude of described high-frequency signal;
S340: search described local discharge detection device and detect that, in cable local discharge signal, corresponding described signal source sends the signal of minimum amplitude in the amplitude of high-frequency signal.
In the present embodiment, keep predeterminated frequency constant, regulate the amplitude of high-frequency signal, get rid of the factors such as frequency obtain signal impact on the later stage, guarantee the accurate of signal analysis.
As shown in Figure 4, wherein in an embodiment, described S400 specifically comprises step:
S420: change described predeterminated frequency, the amplitude of described high-frequency signal is repeatedly regulated described in repeating, searching described local discharge detection device detects in cable local discharge signal, corresponding described signal source sends the signals step of minimum amplitude in the amplitude of high-frequency signal, obtains the signal of the minimum amplitude under multiple predeterminated frequency respectively;
S440: respectively according to the signal of the minimum amplitude under multiple predeterminated frequency, determines the sensitivity of the high frequency sensors described to be measured under multiple predeterminated frequency;
S460: to the sensitivity averaged of the high frequency sensors described to be measured under described multiple predeterminated frequency.
Repeatedly adjust the frequency of high-frequency signal, the step of step S300 is adopted to obtain the signal of the minimum amplitude under different frequency respectively, namely obtain the sensitivity of the high frequency sensors to be measured under different frequency, the sensitivity of the high frequency sensors to be measured under these different frequencies is averaged calculating.The sensitivity data of high frequency sensors identical under multiple frequency is averaged calculating, reduces error, improve the accuracy of result.
A kind of high frequency sensors, comprise high frequency sensors body and high frequency sensors sensitivity detector described above, described high frequency sensors body is connected with described high frequency sensors sensitivity detector.
The present invention also provides a kind of high frequency sensors included as above-mentioned high frequency sensors sensitivity detector and high frequency sensors body, and based on above-mentioned same reasons, high frequency sensors of the present invention simply, accurately, independently can realize the detection of sensitivity.
In order to the technical scheme of further explaining high frequency sensors of the present invention and sensitivity detector and detection method in detail and the beneficial effect brought thereof, below employing one example is described.
The signal that signal source adopts signal generator to export, simulation produces high-frequency signal, by earthing cable and build-out resistor ground connection, the size of build-out resistor is 50 Ω, earthing cable, through high frequency sensors, is comparatively tested high frequency sensors sensitivity by the amplitude, frequency etc. of observing the signal that Partial discharge detector surveys.
Concrete measuring process is as follows:
(1) within the scope of 3MHz ~ 30MHz, the frequency adjustment outputed signal as the signal generator of signal source is remained unchanged to suitable size, the amplitude of conditioning signal generator output signal, observe the signal that Partial discharge detector detects, find out the minimum signal value that Partial discharge detector can detect under this frequency, the high frequency sensors sensitivity namely under this frequency.
Or
(2) within the scope of 3MHz ~ 30MHz, change the frequency of signal generator output signal, repeat above test process, multiple Sensitirity va1ues of gained are averaging and obtain the average sensitivity of this high frequency sensors in this frequency range.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a high frequency sensors sensitivity detector, is characterized in that, comprises signal source, cable and local discharge detection device;
One end of described cable is connected with described signal source, and described cable passes high frequency sensors to be measured, the other end ground connection of described cable, and described local discharge detection device is connected with described high frequency sensors to be measured;
Described signal source sends high-frequency signal to described cable according to predeterminated frequency, described local discharge detection device is by described high frequency sensors monitoring cable partial discharge phenomenon to be measured, obtain cable local discharge signal, described signal source is repeatedly regulated to send the amplitude of high-frequency signal, searching described local discharge detection device detects in cable local discharge signal, corresponding described signal source sends the signal of minimum amplitude in the amplitude of high-frequency signal, according to the signal of this minimum amplitude, determine the sensitivity of described high frequency sensors to be measured.
2. high frequency sensors sensitivity detector according to claim 1, is characterized in that, also comprise protective resistance, and described cable is by described protective resistance ground connection.
3. high frequency sensors sensitivity detector according to claim 2, is characterized in that, the resistance of described protective resistance is 50 ohm.
4. high frequency sensors sensitivity detector according to claim 1 and 2, is characterized in that, described local discharge detection device is Analysis of Partial Discharge instrument.
5. high frequency sensors sensitivity detector according to claim 1 and 2, is characterized in that, the predeterminated frequency interval value that described signal source sends high-frequency signal is 3MHz ~ 30MHz.
6. high frequency sensors sensitivity detector according to claim 1 and 2, is characterized in that, described local discharge detection device is spectrum analyzer.
7. a high frequency sensors sensitivity detection method, is characterized in that, comprises step:
High-frequency signal is sent to cable, to make cable generation partial discharge phenomenon according to predeterminated frequency;
Monitoring cable partial discharge phenomenon, utilizes local discharge detection device by high frequency sensors to be measured, obtains cable local discharge signal;
Repeatedly regulate the amplitude of described high-frequency signal, search described local discharge detection device and detect that, in cable local discharge signal, correspondence sends the signal of minimum amplitude in the amplitude of high-frequency signal;
According to the signal of this minimum amplitude, determine the sensitivity of described high frequency sensors to be measured.
8. high frequency sensors sensitivity detection method according to claim 7, it is characterized in that, the described amplitude repeatedly regulating described high-frequency signal, searching described local discharge detection device detects in cable local discharge signal, and the signal that corresponding described signal source sends minimum amplitude in the amplitude of high-frequency signal specifically comprises step:
Keep described predeterminated frequency constant, repeatedly regulate the amplitude of described high-frequency signal;
Search described local discharge detection device and detect that, in cable local discharge signal, corresponding described signal source sends the signal of minimum amplitude in the amplitude of high-frequency signal.
9. the high frequency sensors sensitivity detection method according to claim 7 or 8, is characterized in that, described step, according to the signal of this minimum amplitude, determines that the sensitivity of described high frequency sensors to be measured specifically comprises step:
Change described predeterminated frequency, the amplitude of described high-frequency signal is repeatedly regulated described in repeating, searching described local discharge detection device detects in cable local discharge signal, corresponding described signal source sends the signals step of minimum amplitude in the amplitude of high-frequency signal, obtains the signal of the minimum amplitude under multiple predeterminated frequency respectively;
Respectively according to the signal of the minimum amplitude under multiple predeterminated frequency, determine the sensitivity of the high frequency sensors described to be measured under multiple predeterminated frequency;
To the sensitivity averaged of the high frequency sensors described to be measured under described multiple predeterminated frequency.
10. a high frequency sensors, is characterized in that, comprise high frequency sensors body and the high frequency sensors sensitivity detector as described in claim 1 to 6 any one, described high frequency sensors body is connected with described high frequency sensors sensitivity detector.
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| CN106154200A (en) * | 2016-06-15 | 2016-11-23 | 贵州电网有限责任公司六盘水供电局 | Portable GIS local discharge high frequency sensors test device and method of testing |
| CN106199478A (en) * | 2016-06-30 | 2016-12-07 | 杭州西湖电子研究所 | The examination calibration equipment of a kind of high frequency electric method Partial discharge detector and method |
| CN109407026A (en) * | 2018-11-15 | 2019-03-01 | 昆明理工大学 | A kind of assessment device and method of superfrequency PD meter |
| CN109579973A (en) * | 2018-11-22 | 2019-04-05 | 国网天津市电力公司电力科学研究院 | A kind of vibrating speed sensors sensitivity coefficient method of calibration |
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| CN111856383A (en) * | 2020-07-28 | 2020-10-30 | 红相股份有限公司 | Indirect measurement method for sensitivity of high-frequency pulse sensor |
| CN111856382A (en) * | 2020-07-28 | 2020-10-30 | 红相股份有限公司 | Indirect measuring equipment for sensitivity of high-frequency pulse sensor |
| CN113311291A (en) * | 2021-05-28 | 2021-08-27 | 国网江苏省电力有限公司无锡供电分公司 | Partial discharge detection sensitivity testing device and method for long-section high-voltage cable |
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| CN104914365B (en) * | 2015-06-12 | 2017-08-29 | 国网天津市电力公司 | A kind of detection means and method for improving Partial Discharge Detection sensitivity |
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| CN106154200A (en) * | 2016-06-15 | 2016-11-23 | 贵州电网有限责任公司六盘水供电局 | Portable GIS local discharge high frequency sensors test device and method of testing |
| CN106154200B (en) * | 2016-06-15 | 2023-04-07 | 贵州电网有限责任公司六盘水供电局 | Portable GIS partial discharge high-frequency sensor testing device and testing method |
| 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 |
| CN106199478A (en) * | 2016-06-30 | 2016-12-07 | 杭州西湖电子研究所 | The examination calibration equipment of a kind of high frequency electric method Partial discharge detector and method |
| CN109407026A (en) * | 2018-11-15 | 2019-03-01 | 昆明理工大学 | A kind of assessment device and method of superfrequency PD meter |
| CN109407026B (en) * | 2018-11-15 | 2024-03-19 | 昆明理工大学 | Evaluation device and method for ultrahigh frequency partial discharge instrument |
| CN109579976A (en) * | 2018-11-22 | 2019-04-05 | 国网天津市电力公司电力科学研究院 | A kind of piezoelectric acceleration transducer sensitivity coefficient method of calibration |
| CN109579973A (en) * | 2018-11-22 | 2019-04-05 | 国网天津市电力公司电力科学研究院 | A kind of vibrating speed sensors sensitivity coefficient method of calibration |
| CN111856383A (en) * | 2020-07-28 | 2020-10-30 | 红相股份有限公司 | Indirect measurement method for sensitivity of high-frequency pulse sensor |
| CN111856382A (en) * | 2020-07-28 | 2020-10-30 | 红相股份有限公司 | Indirect measuring equipment for sensitivity of high-frequency pulse sensor |
| CN111856383B (en) * | 2020-07-28 | 2022-08-23 | 红相股份有限公司 | Indirect measurement method for sensitivity of high-frequency pulse sensor |
| CN113311291A (en) * | 2021-05-28 | 2021-08-27 | 国网江苏省电力有限公司无锡供电分公司 | Partial discharge detection sensitivity testing device and method for long-section high-voltage cable |
| CN113484579A (en) * | 2021-06-16 | 2021-10-08 | 深圳供电局有限公司 | Magnetic saturation characteristic determination method and device, computer equipment and storage medium |
| 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 |
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Application publication date: 20141217 |
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| RJ01 | Rejection of invention patent application after publication |