CN104931911A - Calibration device and method of ultra-high frequency partial discharge sensor - Google Patents
Calibration device and method of ultra-high frequency partial discharge sensor Download PDFInfo
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Abstract
The invention provides a calibration device and method of an ultra-high frequency partial discharge sensor. The calibration device and method are matched with an ultra-high frequency partial discharge sensor to be calibrated. The calibration device includes a signal generator for providing ultra-high frequency signals, a signal receiver for receiving the ultra-high frequency signals, impedance transition sections for eliminating ultra-high frequency signal refraction and reflection, a coaxial transmission line used for generating TEM waves when the ultra-high frequency signals are transmitted, a matching impedor and an oscilloscope for displaying the frequency and amplitude of the TEM waves; two impedance transition sections exist and are circular cone-shaped; the top parts of the circular cone-shaped structures of the two impedance transition sections are provided with the matching impedor and the signal receiver connected with the signal generator respectively; the coaxial transmission line is arranged between the bottoms of the circular cone-shaped structures of the two impedance transition sections; the coaxial transmission line is a hollow circular cylinder; and the inner wall of the coaxial transmission line is provided with the ultra-high frequency partial discharge sensor to be calibrated which is connected with the oscilloscope. With the calibration device provided by the embodiment of the invention adopted, the sensitivity and bandwidth of the ultra-high frequency partial discharge sensor can be calibrated more accurately, and workload can be reduced.
Description
Technical field
The present invention relates to high-frequency local discharging sensor technical field, particularly relate to a kind of caliberating device and method of high-frequency local discharging sensor.
Background technology
Ultra high frequency PD detection technology relies on the advantages such as antijamming capability is strong at GIS(Gas Insulated Switchgear, gas-insulated switchgear) etc. large scale electrical power unit state of insulation on-line monitoring in be used widely.But, also do not promulgate the relevant world/country/industry standard for high-frequency local discharging sensor at present, therefore unified standard all lacked for the high-frequency local discharging sensor of different manufacturers in market and carry out examination verification.Although international conference on large HV electric systems once proposed to adopt the method for artificial impulses injection to demarcate the sensitivity of high-frequency local discharging sensor and bandwidth, but need repeatedly to debug to determine reasonably artificial pulse, process is comparatively loaded down with trivial details, and because artificial pulse comprises abundant spectrum component, easily cause different spectral aliasing, make calibration result be difficult to assessment.
Summary of the invention
Embodiment of the present invention technical matters to be solved is, provides a kind of caliberating device and method of high-frequency local discharging sensor, can the more sensitivity of accurate calibration high-frequency local discharging sensor and bandwidth, and reduces workload.
In order to solve the problems of the technologies described above, embodiments provide a kind of caliberating device of high-frequency local discharging sensor, it matches with high-frequency local discharging sensor to be calibrated, described device comprise for provide the signal generator of ultra-high frequency signal, for receive described ultra-high frequency signal signal receiver, for eliminating described ultra-high frequency signal catadioptric transition of mechanical impedance section, for producing the coaxial transmission line of TEM ripple, matched impedance and the oscillograph for showing described TEM ripple frequency and amplitude when the transmission of described ultra-high frequency signal; Wherein,
Described transition of mechanical impedance section has two, and two described transition of mechanical impedance sections are circular cone; Wherein, the described signal receiver that the conical top of two described transition of mechanical impedance sections is respectively equipped with described matched impedance and is connected with described signal generator, and be provided with described coaxial transmission line between the conical base of two described transition of mechanical impedance sections;
Described coaxial transmission line is hollow circuit cylinder, and its inwall is provided with the high-frequency local discharging sensor described to be calibrated be connected with described oscillograph.
Wherein, the structure of described coaxial transmission line is identical with the structure of GIS bus section, busbar section, and its diameter is all equal with the conical base diameter of described two transition of mechanical impedance sections.
Wherein, the wave impedance that described two transition of mechanical impedance section conical top are formed is 50ohms, and the wave impedance that its conical base is formed is all equal with the wave impedance that described coaxial transmission line is formed.
Wherein, described signal receiver is radio frequency socket, and it is connected with described signal generator by concentric cable.
Wherein, the frequency of described ultra-high frequency signal is positioned in [300MHz, 3GHz] scope.
The embodiment of the present invention additionally provides a kind of scaling method of high-frequency local discharging sensor, and it realizes in aforesaid device matches with high-frequency local discharging sensor to be calibrated, and described method comprises:
To obtain in signal generator in described device launch the frequency range of ultra-high frequency signal, the described frequency range obtained is divided by certain frequency interval, obtain multiple frequency band, and in each frequency band, select a corresponding width-adjustable frequency respectively, the amplitude of each width-adjustable frequency is regulated to determine the corresponding each width-adjustable frequency of described high-frequency local discharging sensor to be calibrated detectable minimum signal value of difference in oscillograph according to the amplitude range of adjustment preset, and using the described each minimum signal value determined as described high-frequency local discharging sensor to be calibrated in the sensitivity that each frequency band is corresponding, and
In described signal generator internal fixtion one amplitude, each ultra-high frequency signal being arranged in described frequency range is all exported by described fixing amplitude and determines described high-frequency local discharging sensor signal value to be calibrated at described oscillograph amplitude attenuation to upper limiting frequency corresponding during predetermined threshold value and lower frequency limit, and using the bandwidth of the difference of described upper limiting frequency and described lower frequency limit as described high-frequency local discharging sensor to be calibrated.
Wherein, described method comprises further:
Multiple frequency is selected in frequency range in described signal generator, and after respectively amplitude modulation being carried out to selected each frequency, obtain the described high-frequency local discharging sensor signal to be calibrated amplitude situation of change that each institute selected frequency is corresponding respectively in described oscillograph, according to the amplitude situation of change of described each institute's selected frequency and correspondence thereof, adopt linear function to carry out matching respectively, obtain the degree of fitting that each institute selected frequency is corresponding respectively;
When the degree of fitting that the described each institute selected frequency obtained is corresponding respectively all meets predetermined condition, then keep described high-frequency local discharging sensor to be calibrated constant;
When the degree of fitting that the described each institute selected frequency obtained is corresponding respectively does not meet predetermined condition, then described high-frequency local discharging sensor to be calibrated is checked.
Wherein, the frequency range of described ultra-high frequency signal is [300MHz, 3GHz].
Wherein, described predetermined threshold value is 3dB.
Implement the embodiment of the present invention, there is following beneficial effect:
1, in embodiments of the present invention, owing to adopting TEM ripple to demarcate high-frequency local discharging sensor to be calibrated, more adequately can calibrate the bandwidth sum sensitivity of high-frequency local discharging sensor to be calibrated, reduce workload;
2, in embodiments of the present invention, owing to coaxial transmission line to be modeled as actual GIS bus section, busbar section, and as the waveguide of TEM ripple, make more to press close to actual conditions.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, the accompanying drawing obtaining other according to these accompanying drawings still belongs to category of the present invention.
The system architecture schematic diagram of the caliberating device of the high-frequency local discharging sensor that Fig. 1 provides for the embodiment of the present invention;
The process flow diagram of the scaling method of the high-frequency local discharging sensor that Fig. 2 provides for the embodiment of the present invention;
In figure: 1-signal generator, 2-signal receiver, 3-transition of mechanical impedance section, 4-coaxial transmission line, 5-matched impedance, 6-oscillograph, L-high-frequency local discharging sensor to be calibrated.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, for in the embodiment of the present invention, the caliberating device of a kind of high-frequency local discharging sensor proposed, it matches with high-frequency local discharging sensor L to be calibrated, device comprise for provide the signal generator 1 of ultra-high frequency signal, for receive ultra-high frequency signal signal receiver 2, for eliminating the catadioptric transition of mechanical impedance section 3 of ultra-high frequency signal, for producing the coaxial transmission line 4 of TEM ripple, matched impedance 5 and the oscillograph 6 for showing TEM ripple frequency and amplitude when ultra-high frequency signal transmits; Wherein,
Transition of mechanical impedance section 3 has two, and two transition of mechanical impedance sections 3 are circular cone; Wherein, the signal receiver 2 that the conical top of two transition of mechanical impedance sections 3 is respectively equipped with matched impedance 5 and is connected with signal generator 1, and be provided with coaxial transmission line 4 between the conical base of two transition of mechanical impedance sections 3;
Coaxial transmission line 4 is hollow circuit cylinder, and its inwall is provided with the high-frequency local discharging sensor L to be calibrated be connected with oscillograph 6.
Should be noted that, frequency electromagnetic waves (i.e. ultra-high frequency signal) is in communication process, if the sudden change running into impedance will produce catadioptric, cause wave form distortion, the signal so measured on high-frequency local discharging sensor L to be calibrated will be irregular, thus make high-frequency local discharging sensor L to be calibrated demarcation be difficult to carry out or cannot carry out, need the transmission line that connection two sections of wave impedance are different for this reason, and ensure wave impedance continuous transition, therefore adopt conical two transition of mechanical impedance sections 3 to eliminate ultra-high frequency signal catadioptric.
In embodiments of the present invention, the wave impedance that two transition of mechanical impedance section 3 conical top are formed generally is 50ohms, the wave impedance of conical base is equal with the wave impedance of coaxial transmission line 4, therefore the wave impedance of two transition of mechanical impedance section 3 conical base depends on the impedance of the coaxial transmission line 4 that concrete timing signal is used, and concrete size is then determined according to the size of wave impedance.
In order to make more to press close to actual conditions, therefore the structure of coaxial transmission line 4 is identical with the structure of GIS bus section, busbar section, and its diameter is all equal with the conical base diameter of two transition of mechanical impedance sections 3.。
In one embodiment, signal receiver 2 is radio frequency socket, and it is connected with signal generator 1 by concentric cable, and the ultra-high frequency signal frequency that now signal generator 1 provides is positioned in [300MHz, 3GHz] scope.
The principle of work of the caliberating device of the high-frequency local discharging sensor in the embodiment of the present invention is: first, demarcates the sensitivity of high-frequency local discharging sensor L to be calibrated.In the frequency range that need detect ultra-high frequency signal, (as 300MHz-3GHz) marks off multiple frequency band by certain frequency interval, and in each frequency band, select a corresponding width-adjustable frequency respectively, the output amplitude of signal generator 1 is regulated under fixed frequency selected in each frequency band successively, the signal that high-frequency local discharging sensor L to be calibrated records is observed by oscillograph 6, find out high-frequency local discharging sensor L detectable minimum signal value under each width-adjustable frequency, be the sensitivity of high-frequency local discharging sensor L to be calibrated in each frequency band difference correspondence,
Secondly, the bandwidth of high-frequency local discharging sensor L to be calibrated is demarcated.Signal generator 1 output amplitude is adjusted to a certain desired value and remains unchanged, the frequency of signal source is changed between the bound frequency of high-frequency local discharging sensor L institute to be calibrated nominal, record high-frequency local discharging sensor L to be calibrated and measure the signal amplitude of gained, find out upper limiting frequency f corresponding when signal amplitude that high-frequency local discharging sensor L to be calibrated measures gained decays to predetermined threshold value (as 3dB) by oscillograph 6
maxwith lower frequency limit f
min, now the frequency span of high-frequency local discharging sensor L is: Δ f=f
max-f
min;
Finally, high-frequency local discharging sensor L to be calibrated is checked.In the amplitude that signal generator 1 regulates width-adjustable frequency correspondence selected in each frequency band to export respectively, and the amplitude situation of change that the signal recording high-frequency local discharging sensor L to be calibrated measurement gained in oscillograph 6 is corresponding, the amplitude situation of change that each width-adjustable frequency is corresponding with the signal that high-frequency local discharging sensor L to be calibrated measures gained carries out linear function fit, obtains the degree of fitting of each width-adjustable frequency; When the degree of fitting of each width-adjustable frequency does not all meet predetermined condition, high-frequency local discharging sensor L to be calibrated is checked, otherwise, remain unchanged.
As shown in Figure 2, be the embodiment of the present invention, the scaling method of a kind of high-frequency local discharging sensor of proposition, it realizes in aforesaid device matches with high-frequency local discharging sensor to be calibrated, and described method comprises:
Step S201, to obtain in signal generator in described device launch the frequency range of ultra-high frequency signal, the described frequency range obtained is divided by certain frequency interval, obtain multiple frequency band, and in each frequency band, select a corresponding width-adjustable frequency respectively, the amplitude of each width-adjustable frequency is regulated to determine the corresponding each width-adjustable frequency of described high-frequency local discharging sensor to be calibrated detectable minimum signal value of difference in oscillograph according to the amplitude range of adjustment preset, and using the described each minimum signal value determined as described high-frequency local discharging sensor to be calibrated in the sensitivity that each frequency band is corresponding,
Step S202, in described signal generator internal fixtion one amplitude, each ultra-high frequency signal being arranged in described frequency range is all exported by described fixing amplitude and determines described high-frequency local discharging sensor signal value to be calibrated at described oscillograph amplitude attenuation to upper limiting frequency corresponding during predetermined threshold value and lower frequency limit, and using the bandwidth of the difference of described upper limiting frequency and described lower frequency limit as described high-frequency local discharging sensor to be calibrated.
Wherein, described method comprises further:
Multiple frequency is selected in frequency range in described signal generator, and after respectively amplitude modulation being carried out to selected each frequency, obtain the described high-frequency local discharging sensor signal to be calibrated amplitude situation of change that each institute selected frequency is corresponding respectively in described oscillograph, according to the amplitude situation of change of described each institute's selected frequency and correspondence thereof, adopt linear function to carry out matching respectively, obtain the degree of fitting that each institute selected frequency is corresponding respectively;
When the degree of fitting that the described each institute selected frequency obtained is corresponding respectively all meets predetermined condition, then keep described high-frequency local discharging sensor to be calibrated constant;
When the degree of fitting that the described each institute selected frequency obtained is corresponding respectively does not meet predetermined condition, then described high-frequency local discharging sensor to be calibrated is checked.
Wherein, the frequency range of described ultra-high frequency signal is [300MHz, 3GHz].
Wherein, described predetermined threshold value is 3dB.
Implement the embodiment of the present invention, there is following beneficial effect:
1, in embodiments of the present invention, owing to adopting TEM ripple to demarcate high-frequency local discharging sensor to be calibrated, more adequately can calibrate the bandwidth sum sensitivity of high-frequency local discharging sensor to be calibrated, reduce workload;
2, in embodiments of the present invention, owing to coaxial transmission line to be modeled as actual GIS bus section, busbar section, and as the waveguide of TEM ripple, make more to press close to actual conditions.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (9)
1. the caliberating device of a high-frequency local discharging sensor, it matches with high-frequency local discharging sensor to be calibrated, it is characterized in that, described device comprise for provide the signal generator of ultra-high frequency signal (1), for receive described ultra-high frequency signal signal receiver (2), for eliminating described ultra-high frequency signal catadioptric transition of mechanical impedance section (3), for producing the coaxial transmission line (4) of TEM ripple, matched impedance (5) and the oscillograph (6) for showing described TEM ripple frequency and amplitude when the transmission of described ultra-high frequency signal; Wherein,
Described transition of mechanical impedance section (3) has two, and two described transition of mechanical impedance sections (3) are circular cone; Wherein, the described signal receiver (2) that the conical top of two described transition of mechanical impedance sections (3) is respectively equipped with described matched impedance (5) and is connected with described signal generator (1), and be provided with described coaxial transmission line (4) between the conical base of two described transition of mechanical impedance sections (3);
Described coaxial transmission line (4) is hollow circuit cylinder, and its inwall is provided with the high-frequency local discharging sensor described to be calibrated be connected with described oscillograph (6).
2. device as claimed in claim 1, it is characterized in that, the structure of described coaxial transmission line (4) is identical with the structure of GIS bus section, busbar section, and its diameter is all equal with the conical base diameter of described two transition of mechanical impedance sections (3).
3. device as claimed in claim 2, it is characterized in that, the wave impedance that described two transition of mechanical impedance section (3) conical top are formed is 50ohms, and the wave impedance that its conical base is formed is all equal with the wave impedance that described coaxial transmission line (4) is formed.
4. device as claimed in claim 3, it is characterized in that, described signal receiver (2) is radio frequency socket, and it is connected with described signal generator (1) by concentric cable.
5. device as claimed in claim 4, it is characterized in that, the frequency of described ultra-high frequency signal is positioned in [300MHz, 3GHz] scope.
6. a scaling method for high-frequency local discharging sensor, is characterized in that, it realizes in the device such as according to any one of claim 1 to 5 matches with high-frequency local discharging sensor to be calibrated, and described method comprises:
To obtain in signal generator in described device launch the frequency range of ultra-high frequency signal, the described frequency range obtained is divided by certain frequency interval, obtain multiple frequency band, and in each frequency band, select a corresponding width-adjustable frequency respectively, the amplitude of each width-adjustable frequency is regulated to determine the corresponding each width-adjustable frequency of described high-frequency local discharging sensor to be calibrated detectable minimum signal value of difference in oscillograph according to the amplitude range of adjustment preset, and using the described each minimum signal value determined as described high-frequency local discharging sensor to be calibrated in the sensitivity that each frequency band is corresponding, and
In described signal generator internal fixtion one amplitude, each ultra-high frequency signal being arranged in described frequency range is all exported by described fixing amplitude and determines described high-frequency local discharging sensor signal value to be calibrated at described oscillograph amplitude attenuation to upper limiting frequency corresponding during predetermined threshold value and lower frequency limit, and using the bandwidth of the difference of described upper limiting frequency and described lower frequency limit as described high-frequency local discharging sensor to be calibrated.
7. method as claimed in claim 6, it is characterized in that, described method comprises further:
Multiple frequency is selected in frequency range in described signal generator, and after respectively amplitude modulation being carried out to selected each frequency, obtain the described high-frequency local discharging sensor signal to be calibrated amplitude situation of change that each institute selected frequency is corresponding respectively in described oscillograph, according to the amplitude situation of change of described each institute's selected frequency and correspondence thereof, adopt linear function to carry out matching respectively, obtain the degree of fitting that each institute selected frequency is corresponding respectively;
When the degree of fitting that the described each institute selected frequency obtained is corresponding respectively all meets predetermined condition, then keep described high-frequency local discharging sensor to be calibrated constant;
When the degree of fitting that the described each institute selected frequency obtained is corresponding respectively does not meet predetermined condition, then described high-frequency local discharging sensor to be calibrated is checked.
8. method as claimed in claims 6 or 7, it is characterized in that, the frequency range of described ultra-high frequency signal is [300MHz, 3GHz].
9. method as claimed in claim 6, it is characterized in that, described predetermined threshold value is 3dB.
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| CN110927541A (en) * | 2019-12-09 | 2020-03-27 | 国网上海市电力公司 | Reconfigurable antenna sensor for detecting partial discharge of switch cabinet |
| CN112180311A (en) * | 2019-07-05 | 2021-01-05 | 杭州西湖电子研究所 | Calibration and positioning method for station domain partial discharge detection |
| CN112526426A (en) * | 2020-11-16 | 2021-03-19 | 中国电力科学研究院有限公司 | Device and method for testing sag rate of impact current sensor |
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| CN112526426A (en) * | 2020-11-16 | 2021-03-19 | 中国电力科学研究院有限公司 | Device and method for testing sag rate of impact current sensor |
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