CN104931911B - A kind of caliberating device and method of high-frequency local discharging sensor - Google Patents
A kind of caliberating device and method of high-frequency local discharging sensor Download PDFInfo
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- CN104931911B CN104931911B CN201510321114.0A CN201510321114A CN104931911B CN 104931911 B CN104931911 B CN 104931911B CN 201510321114 A CN201510321114 A CN 201510321114A CN 104931911 B CN104931911 B CN 104931911B
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Abstract
The present invention provides a kind of caliberating device and method of high-frequency local discharging sensor, it is engaged with high-frequency local discharging sensor to be calibrated, including for provide the signal generator of ultra-high frequency signal, the signal receiver for receiving ultra-high frequency signal, the transition of mechanical impedance section for eliminating ultra-high frequency signal catadioptric, for producing the coaxial transmission lines of TEM ripples, matching impedance and oscillograph for showing TEM wave frequency rates and amplitude when ultra-high frequency signal transmits；Transition of mechanical impedance section has two and is circular cone；The conical top of two transition of mechanical impedance sections is respectively equipped with matching impedance and the signal receiver being connected with signal generator, and coaxial transmission line is equipped between the conical base of two transition of mechanical impedance sections；Coaxial transmission line is hollow circuit cylinder, its inner wall is equipped with the high-frequency local discharging sensor to be calibrated being connected with oscillograph.Implement the embodiment of the present invention, being capable of the more sensitivity of accurate calibration high-frequency local discharging sensor and bandwidth, and reduce workload.
Description
Technical field
The present invention relates to high-frequency local discharging sensor technical field, more particularly to a kind of high-frequency local discharging to sense
The caliberating device and method of device.
Background technology
Ultra high frequency PD detection technology is by advantages such as strong antijamming capabilities in GIS（Gas Insulated
Switchgear, gas-insulated switchgear）It is used widely in on-line monitoring Deng large scale electrical power unit state of insulation.But
It is, currently for high-frequency local discharging sensor also without the relevant world/country/professional standard of promulgation, therefore for city
The high-frequency local discharging sensor of different manufacturers lacks unified standard and carries out examination verification in.Although international bulk power grid
Meeting it has been suggested that cross using the method for artificial pulse injection come the sensitivity to high-frequency local discharging sensor and bandwidth into
Rower is determined, but needs to debug repeatedly to determine rational artificial pulse, and process is relatively complicated, and due to being wrapped in artificial pulse
Abundant spectrum component is included, is easy to cause different spectral aliasing so that calibration result is difficult assessment.
The content of the invention
Technical problem to be solved of the embodiment of the present invention is, there is provided a kind of calibration of high-frequency local discharging sensor
Device and method, being capable of the more sensitivity of accurate calibration high-frequency local discharging sensor and bandwidth, and reduce work
Amount.
In order to solve the above-mentioned technical problem, an embodiment of the present invention provides a kind of calibration of high-frequency local discharging sensor
Device, it is engaged with high-frequency local discharging sensor to be calibrated, and described device includes being used for the letter for providing ultra-high frequency signal
Number generator, the signal receiver for receiving the ultra-high frequency signal, the resistance for eliminating the ultra-high frequency signal catadioptric
Anti- changeover portion, for producing the coaxial transmission lines of TEM ripples, matching impedance when the ultra-high frequency signal transmits and for showing
State the oscillograph of TEM wave frequency rates and amplitude；Wherein,
The transition of mechanical impedance section has two, and two transition of mechanical impedance sections are circular cone；Wherein, two transition of mechanical impedance
The conical top of section is respectively equipped with the matching impedance and the signal receiver being connected with the signal generator, and two
The coaxial transmission line is equipped between the conical base of the transition of mechanical impedance section；
The coaxial transmission line is hollow circuit cylinder, its inner wall is equipped with the superelevation to be calibrated being connected with the oscillograph
Frequency local discharge sensor.
Wherein, the structure of the coaxial transmission line is identical with the structure of GIS bus section, busbar sections, and its diameter and described two impedances
The conical base diameter of changeover portion is equal.
Wherein, the wave impedance formed on described two transition of mechanical impedance section conical tops is 50ohms, in its conical base
The wave impedance of formation is equal with the wave impedance that the coaxial transmission line is formed.
Wherein, the signal receiver is radio frequency socket, it is connected by coaxial cable with the signal generator.
Wherein, the frequency of the ultra-high frequency signal is located in the range of [300MHz, 3GHz].
The embodiment of the present invention additionally provides a kind of scaling method of high-frequency local discharging sensor, it is in foregoing device
Middle realization is engaged with high-frequency local discharging sensor to be calibrated, the described method includes：
Obtain in signal generator launching in described device the frequency range of ultra-high frequency signal, by the obtained frequency
Scope is divided by certain frequency interval, obtains multiple frequency bands, and is selected respectively in each frequency band corresponding one adjustable
Swing frequency, determines that the hyperfrequency to be calibrated is local according to the amplitude of each adjustable Swing frequency of default amplitude adjustable range adjusting
Discharge sensor corresponds to each adjustable Swing frequency and distinguishes detectable minimum signal value in oscillograph, and by it is described it is definite it is each most
Small signal value is respectively as the high-frequency local discharging sensor to be calibrated in the corresponding sensitivity of each frequency band；And
An amplitude is fixed in the signal generator, each ultra-high frequency signal in the frequency range is pressed
The amplitude of the fixation is exported to determine high-frequency local discharging sensor signal value to be calibrated width in the oscillograph
Value decays to corresponding upper limiting frequency and lower frequency limit during predetermined threshold value, and by the upper limiting frequency and the difference of the lower frequency limit
It is worth the bandwidth as the high-frequency local discharging sensor to be calibrated.
Wherein, the method is further included：
Multiple frequencies are selected in frequency range in the signal generator, and amplitude modulation is carried out to selected each frequency respectively
Afterwards, the corresponding width of the high-frequency local discharging sensor signal to be calibrated each institute's selected frequency in the oscillograph is obtained
It is worth situation of change, according to each institute's selected frequency and its corresponding amplitude situation of change, is fitted respectively using linear function,
Obtain the corresponding degree of fitting of each institute's selected frequency；
When the obtained corresponding degree of fitting of each institute's selected frequency is satisfied by predetermined condition, then treated described in holding
It is constant to demarcate high-frequency local discharging sensor；
When the obtained corresponding degree of fitting of each institute's selected frequency is unsatisfactory for predetermined condition, then wait to mark to described
Determine high-frequency local discharging sensor to be checked.
Wherein, the frequency range of the ultra-high frequency signal is [300MHz, 3GHz].
Wherein, the predetermined threshold value is 3dB.
Implement the embodiment of the present invention, have the advantages that：
1st, in embodiments of the present invention, due to being demarcated using TEM ripples to high-frequency local discharging sensor to be calibrated,
Bandwidth and the sensitivity of high-frequency local discharging sensor to be calibrated can be more precisely calibrated, reduces workload；
2nd, in embodiments of the present invention, since coaxial transmission line is modeled as actual GIS bus section, busbar sections, and as TEM ripples
Waveguide so that with actual conditions more close to.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, according to
These attached drawings obtain other attached drawings and still fall within scope of the invention.
Fig. 1 is the system structure signal of the caliberating device of high-frequency local discharging sensor provided in an embodiment of the present invention
Figure；
Fig. 2 is the flow chart of the scaling method of high-frequency local discharging sensor provided in an embodiment of the present invention；
In figure：1- signal generators, 2- signal receivers, 3- transition of mechanical impedance sections, 4- coaxial transmission lines, 5- matching impedances,
6- oscillographs, L- high-frequency local discharging sensors to be calibrated.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
It is described in detail on step ground.
As shown in Figure 1, be the caliberating device of a kind of high-frequency local discharging sensor of proposition in the embodiment of the present invention,
It is engaged with high-frequency local discharging sensor L to be calibrated, and device includes being used for the signal generator for providing ultra-high frequency signal
1st, for receiving the signal receiver 2 of ultra-high frequency signal, the transition of mechanical impedance section 3 for eliminating ultra-high frequency signal catadioptric, being used for
The coaxial transmission lines 4 of TEM ripples, matching impedance 5 are produced when ultra-high frequency signal transmits and for showing TEM wave frequency rates and amplitude
Oscillograph 6；Wherein,
Transition of mechanical impedance section 3 has two, and two transition of mechanical impedance sections 3 are circular cone；Wherein, the circular cone of two transition of mechanical impedance sections 3
Top is respectively equipped with matching impedance 5 and the signal receiver 2 being connected with signal generator 1, and the circular cone of two transition of mechanical impedance sections 3
Coaxial transmission line 4 is equipped between bottom；
Coaxial transmission line 4 is hollow circuit cylinder, its inner wall is equipped with the high-frequency local discharging to be calibrated being connected with oscillograph 6
Sensor L.
It should be noted that frequency electromagnetic waves（That is ultra-high frequency signal）In communication process, if running into the mutation of impedance
Catadioptric will be produced, causes wave distortion, then the signal measured on high-frequency local discharging sensor L to be calibrated will be
It is irregular, so that high-frequency local discharging sensor L to be calibrated calibration is difficult to carry out or can not carry out, the company of need for this
Two sections of different transmission lines of wave impedance are connect, and ensure wave impedance continuous transition, therefore use conical two transition of mechanical impedance sections 3
To eliminate ultra-high frequency signal catadioptric.
In embodiments of the present invention, the wave impedance formed on two 3 conical tops of transition of mechanical impedance section is generally 50ohms,
The wave impedance of conical base is equal with the wave impedance of coaxial transmission line 4, therefore the wave impedance of two 3 conical bases of transition of mechanical impedance section
The impedance of coaxial transmission line 4 used, specific size are then determined according to the size of wave impedance during depending on specific calibration.
In order to enable with actual conditions more close to therefore the structure of coaxial transmission line 4 and the structure phase of GIS bus section, busbar sections
Together, and its diameter and the conical base diameter of two transition of mechanical impedance sections 3 are equal..
In one embodiment, signal receiver 2 is radio frequency socket, it is connected by coaxial cable with signal generator 1,
The ultra-high frequency signal frequency that signal generator 1 provides at this time is located in the range of [300MHz, 3GHz].
The operation principle of the caliberating device of high-frequency local discharging sensor in the embodiment of the present invention is：First, treat
The sensitivity of calibration high-frequency local discharging sensor L is demarcated.In the frequency range that ultra-high frequency signal need to be detected（Such as
300MHz-3GHz）Multiple frequency bands are marked off by certain frequency interval, and are selected respectively in each frequency band corresponding one adjustable
Swing frequency, adjusts the output amplitude of signal generator 1, passes through oscillograph 6 successively under fixed frequency selected in each frequency band
The signal that high-frequency local discharging sensor L to be calibrated is measured is observed, finds out high-frequency local discharging sensor L in each width-adjustable
Detectable minimum signal value under frequency, is high-frequency local discharging sensor L to be calibrated corresponding in each frequency band
Sensitivity；
Secondly, the bandwidth of high-frequency local discharging sensor L to be calibrated is demarcated.Signal generator 1 is exported into width
Value is adjusted to a certain desired value and remained unchanged, in the nominal bound frequencies of high-frequency local discharging sensor L to be calibrated
Between change the frequency of signal source, the signal amplitude of high-frequency local discharging sensor L to be calibrated measurement gained is recorded, by showing
The signal amplitude that ripple device 6 finds out high-frequency local discharging sensor L measurements gained to be calibrated decays to predetermined threshold value（Such as 3dB）When
Corresponding upper limiting frequency fmaxWith lower frequency limit fmin, at this time the frequency bandwidth of high-frequency local discharging sensor L be：Δf =
fmax - fmin；
Finally, high-frequency local discharging sensor L to be calibrated is checked.Each frequency is adjusted respectively in signal generator 1
Selected adjustable Swing frequency corresponds to the amplitude of output in rate section, and records high-frequency local discharging to be calibrated in oscillograph 6 and pass
The corresponding amplitude situation of change of signal of sensor L measurement gained, by each adjustable Swing frequency and high-frequency local discharging to be calibrated
The corresponding amplitude situation of change of signal of sensor L measurement gained carries out linear function fit, obtains each adjustable Swing frequency
Degree of fitting；When the degree of fitting of each adjustable Swing frequency is unsatisfactory for predetermined condition, to high-frequency local discharging sensor L to be calibrated
Checked, otherwise, remained unchanged.
As shown in Fig. 2, be the embodiment of the present invention, a kind of scaling method of high-frequency local discharging sensor of proposition, its
Realized in foregoing device is engaged with high-frequency local discharging sensor to be calibrated, the described method includes：
Step S201, obtain in signal generator launching in described device the frequency range of ultra-high frequency signal, by described in
Obtained frequency range is divided by certain frequency interval, obtains multiple frequency bands, and the selection pair respectively in each frequency band
The adjustable Swing frequency answered, the amplitude that each adjustable Swing frequency is adjusted according to default amplitude adjustable range are described to be calibrated to determine
High-frequency local discharging sensor corresponds to each adjustable Swing frequency and detectable minimum signal value is distinguished in oscillograph, and by described in
Definite each minimum signal value is respectively as the high-frequency local discharging sensor to be calibrated in the corresponding spirit of each frequency band
Sensitivity；
Step S202, an amplitude is fixed in the signal generator, by each superelevation in the frequency range
Frequency signal is exported by the amplitude of the fixation to determine the high-frequency local discharging sensor signal value to be calibrated described
Corresponding upper limiting frequency and lower frequency limit during amplitude attenuation to predetermined threshold value in oscillograph, and by the upper limiting frequency with it is described under
Limit bandwidth of the difference of frequency as the high-frequency local discharging sensor to be calibrated.
Wherein, the method is further included：
Multiple frequencies are selected in frequency range in the signal generator, and amplitude modulation is carried out to selected each frequency respectively
Afterwards, the corresponding width of the high-frequency local discharging sensor signal to be calibrated each institute's selected frequency in the oscillograph is obtained
It is worth situation of change, according to each institute's selected frequency and its corresponding amplitude situation of change, is fitted respectively using linear function,
Obtain the corresponding degree of fitting of each institute's selected frequency；
When the obtained corresponding degree of fitting of each institute's selected frequency is satisfied by predetermined condition, then treated described in holding
It is constant to demarcate high-frequency local discharging sensor；
When the obtained corresponding degree of fitting of each institute's selected frequency is unsatisfactory for predetermined condition, then wait to mark to described
Determine high-frequency local discharging sensor to be checked.
Wherein, the frequency range of the ultra-high frequency signal is [300MHz, 3GHz].
Wherein, the predetermined threshold value is 3dB.
Implement the embodiment of the present invention, have the advantages that：
1st, in embodiments of the present invention, due to being demarcated using TEM ripples to high-frequency local discharging sensor to be calibrated,
Bandwidth and the sensitivity of high-frequency local discharging sensor to be calibrated can be more precisely calibrated, reduces workload；
2nd, in embodiments of the present invention, since coaxial transmission line is modeled as actual GIS bus section, busbar sections, and as TEM ripples
Waveguide so that with actual conditions more close to.
The above disclosed power for being only a kind of preferred embodiment of the present invention, the present invention cannot being limited with this certainly
Sharp scope, therefore equivalent variations made according to the claims of the present invention, are still within the scope of the present invention.
Claims (4)
1. a kind of scaling method of high-frequency local discharging sensor, it is characterised in that it is in high-frequency local discharging sensor
Caliberating device be engaged middle realization with high-frequency local discharging sensor to be calibrated, described device includes being used to provide hyperfrequency
The signal generator (1) of signal, the signal receiver (2) for receiving the ultra-high frequency signal, for eliminating the hyperfrequency
The transition of mechanical impedance section (3) of signal catadioptric, for when the ultra-high frequency signal transmits produce TEM ripples coaxial transmission line (4),
Matching impedance (5) and the oscillograph (6) for showing the TEM wave frequency rates and amplitude；Wherein,
The transition of mechanical impedance section (3) has two, and two transition of mechanical impedance sections (3) are circular cone；Wherein, two impedances
The conical top for crossing section (3) is respectively equipped with the matching impedance (5) and is connect with the signal that the signal generator (1) is connected
Device (2) is received, and the coaxial transmission line (4) is equipped between the conical base of two transition of mechanical impedance sections (3)；
The coaxial transmission line (4) is hollow circuit cylinder, its inner wall is described to be calibrated super equipped with what is be connected with the oscillograph (6)
High frequency partial discharge sensor；
The described method includes：
Obtain in signal generator launching in described device the frequency range of ultra-high frequency signal, by the obtained frequency range
Divided by certain frequency interval, obtain multiple frequency bands, and select a corresponding adjustable amplitude-frequency respectively in each frequency band
Rate, the high-frequency local discharging to be calibrated is determined according to the amplitude of each adjustable Swing frequency of default amplitude adjustable range adjusting
Sensor corresponds to each adjustable Swing frequency and detectable minimum signal value is distinguished in oscillograph, and definite each minimum is believed
Number value respectively as the high-frequency local discharging sensor to be calibrated in the corresponding sensitivity of each frequency band；And
An amplitude is fixed in the signal generator, by each ultra-high frequency signal in the frequency range by described
Fixed amplitude is exported to determine that high-frequency local discharging sensor signal value to be calibrated amplitude in the oscillograph declines
Corresponding upper limiting frequency and lower frequency limit during predetermined threshold value are reduced to, and the upper limiting frequency and the difference of the lower frequency limit are made
For the bandwidth of the high-frequency local discharging sensor to be calibrated.
2. the method as described in claim 1, it is characterised in that the method is further included：
Select multiple frequencies in frequency range in the signal generator, and after carrying out amplitude modulation to selected each frequency respectively,
Obtain the corresponding amplitude of the high-frequency local discharging sensor signal to be calibrated each institute's selected frequency in the oscillograph
Situation of change, according to each institute's selected frequency and its corresponding amplitude situation of change, is fitted, obtained respectively using linear function
To the corresponding degree of fitting of each institute's selected frequency；
When the obtained corresponding degree of fitting of each institute's selected frequency is satisfied by predetermined condition, then keep described to be calibrated
High-frequency local discharging sensor is constant；
When the obtained corresponding degree of fitting of each institute's selected frequency is unsatisfactory for predetermined condition, then to described to be calibrated super
High frequency partial discharge sensor is checked.
3. method as claimed in claim 1 or 2, it is characterised in that the frequency range of the ultra-high frequency signal for [300MHz,
3GHz]。
4. the method as described in claim 1, it is characterised in that the predetermined threshold value is 3dB.
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| CN105785206B (en) * | 2016-05-16 | 2018-12-04 | 中国电子科技集团公司第四十一研究所 | A kind of the passband test macro and its method of multichannel frequency converter |
| CN107436417A (en) * | 2017-06-05 | 2017-12-05 | 国网重庆市电力公司电力科学研究院 | The calibration method of ultrahigh frequency partial discharge on-Line Monitor Device under a kind of site environment |
| CN107238811A (en) * | 2017-06-05 | 2017-10-10 | 国网重庆市电力公司电力科学研究院 | The calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under a kind of site environment |
| CN107462853A (en) * | 2017-06-23 | 2017-12-12 | 广西电网有限责任公司电力科学研究院 | A kind of scaling method of superfrequency partial discharge detecting system |
| CN112180311B (en) * | 2019-07-05 | 2022-05-13 | 杭州西湖电子研究所 | Calibration and positioning method for station-area partial discharge detection |
| CN110927541B (en) * | 2019-12-09 | 2021-08-03 | 国网上海市电力公司 | Reconfigurable antenna sensor for detecting partial discharge of switch cabinet |
| 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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| CN101799488B (en) * | 2010-02-23 | 2011-12-21 | 清华大学 | Device and method for generating nominal voltage |
| CN102866375B (en) * | 2012-09-07 | 2014-12-17 | 广东电网公司电力科学研究院 | System and method for calibrating receiving performance of partial-discharge ultrahigh frequency detection device |
| CN103207377B (en) * | 2013-03-21 | 2015-08-12 | 华北电力大学 | The calibration system of partial discharge ultrahigh frequency detection device and scaling method |
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