CN107064846A - The sensitivity detection method and device of live testing apparatus for local discharge - Google Patents
The sensitivity detection method and device of live testing apparatus for local discharge Download PDFInfo
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- CN107064846A CN107064846A CN201611142019.5A CN201611142019A CN107064846A CN 107064846 A CN107064846 A CN 107064846A CN 201611142019 A CN201611142019 A CN 201611142019A CN 107064846 A CN107064846 A CN 107064846A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of sensitivity detection method of live testing apparatus for local discharge and device.Wherein, this method includes：Demarcation signal is produced using impulse generator；In the case where keeping impulse generator output waveform constant, the level of adjustment pulse output；Detection main frame in live testing apparatus for local discharge determines to detect the sensitivity of main frame for inputting the distinguishable peak level of minimum pulse signal.The present invention solves the relatively low technical problem of accuracy in detection of the sensitivity to live testing apparatus for local discharge in correlation technique.
Description
Technical field
The present invention relates to power domain, in particular to a kind of sensitivity technique of live testing apparatus for local discharge
Method and apparatus.
Background technology
It is linear that the key parameter of live testing apparatus for local discharge can include the sensitivity of detecting system, detecting system
Degree, the dynamic range of detecting system, the real-time of detecting system, detecting system interference free performance, detecting system diagnosis it is accurate
Property, the positioning function of detecting system, reliability, stability etc..Wherein, the sensitivity of detecting system reflects instrument and can detected most
The ability of small discharge signal, the parameter by transducer sensitivity, detection frequency band, conditioner bandwidth and gain, acquisition system etc. because
Element is comprehensive to be determined.At present, correlation technique can be detected to the sensitivity of detecting system, and local according to Analysis of test results
The performance of electric discharge measuring device with electricity.But, correlation technique is relatively low to the accuracy in detection of the sensitivity of detecting system, so will
The performance of accurate analysis live testing apparatus for local discharge can be led to not.
For it is relatively low to the accuracy in detection of the sensitivity of live testing apparatus for local discharge in correlation technique the problem of, mesh
It is preceding not yet to propose effective solution.
The content of the invention
The embodiments of the invention provide a kind of sensitivity detection method of live testing apparatus for local discharge and device, so that
The relatively low technical problem of the accuracy in detection to the sensitivity of live testing apparatus for local discharge in correlation technique is solved less.
There is provided a kind of sensitivity technique of live testing apparatus for local discharge for one side according to embodiments of the present invention
Method, including：Demarcation signal is produced using impulse generator；In the case where keeping impulse generator output waveform constant, adjust
The level of whole pulse output；Detection main frame in live testing apparatus for local discharge can for input minimum pulse signal
Differentiate the sensitivity that peak level determines detection main frame.
Further, it is determined that after the sensitivity of detection main frame, this method also includes：To demarcation signal source effectively defeated
Field strength in the range of going out under each output level in gtem cell is demarcated, and is set up demarcation source output level and is supervised with gtem cell
The mapping relations of measuring point field strength；Demarcation signal source output level is adjusted, until partial-discharge ultrahigh-frequency measuring device with electricity is with big
Reflect demarcation signal in the signal to noise ratio equal to 2, and obtain current incident field intensity, wherein, incident field intensity is used to indicate local put
The sensitivity of electric UHF band electric detection means.
Further, it is determined that after the sensitivity of detection main frame, this method also includes：Mould is exported using steep wave generator
Intend partial discharge pulse's signal, wherein, pulse signal is inputted to coupled capacitor device by electric capacity；Using detecting instrument in coupling
The high-frequency current signal produced by steep wave generator is detected on the ground wire of capacitor；The apparent charge simulated in current loop
When measuring as first threshold, determine that detecting instrument shows the signal to noise ratio of high-frequency current signal, wherein, signal to noise ratio is used to indicate part
The sensitivity of electric discharge high frequency electric measuring device with electricity.
Further, it is determined that after the sensitivity of detection main frame, this method also includes：Acoustic emission transducer is positioned over
The central point of test block side, standard transducer and tested sensor is positioned over the opposite side of test block, wherein, acoustic emission transducer
It is connected with acoustic emission system；In the case of acoustic emission system output pulse signal, examination criteria sensor and tested sensor
Frequency response；The ultrasonic measuring device with electricity of shelf depreciation is calculated according to the frequency response of standard transducer and tested sensor
Sensitivity.
Further, it is determined that after the sensitivity of detection main frame, this method also includes：Produced using sinusoidal signal generator
Raw demarcation signal；In the case where keeping sinusoidal signal generator output waveform constant, the level of adjustment pulse output；According to office
In portion's electric discharge TEV measuring device with electricitys shelf depreciation TEV bands are determined for inputting the distinguishable peak level of minimum pulse signal
The sensitivity of electric detection means.
Another aspect according to embodiments of the present invention, additionally provides a kind of sensitivity inspection of live testing apparatus for local discharge
Device is surveyed, including：First generation unit, for producing demarcation signal using impulse generator；First adjustment unit, for protecting
Hold impulse generator output waveform it is constant in the case of, adjustment pulse output level；First determining unit, for according to part
Detection main frame in electric discharge measuring device with electricity determines detection main frame for inputting the distinguishable peak level of minimum pulse signal
Sensitivity.
Further, the device also includes：Unit is demarcated, for after it is determined that detecting the sensitivity of main frame, to demarcation
Field strength of the signal source in effective output area under each output level in gtem cell is demarcated, and sets up demarcation source output electricity
The flat mapping relations with gtem cell monitoring point field strength；Adjustment unit, for adjusting demarcation signal source output level, until part
The UHF band electric detection means that discharges reflects demarcation signal with the signal to noise ratio more than or equal to 2, and obtains current incident field intensity, its
In, incident field intensity is used for the sensitivity for indicating partial-discharge ultrahigh-frequency measuring device with electricity.
Further, the device also includes：Analogue unit, for it is determined that after the sensitivity of detection main frame, using steep
Wave producer output simulation partial discharge pulse signal, wherein, pulse signal is inputted to coupled capacitor device by electric capacity；First
Detection unit, the high frequency electric produced by for utilizing detecting instrument to detect steep wave generator on the ground wire of coupled capacitor device
Signal；Second determining unit, for when the apparent charge amount that current loop is simulated is first threshold, determining that detecting instrument shows
The signal to noise ratio of high-frequency current signal is shown, wherein, signal to noise ratio is used for the spirit for indicating shelf depreciation high frequency electric measuring device with electricity
Sensitivity.
Further, the device also includes：Placement unit, for it is determined that after the sensitivity of detection main frame, sound is sent out
The central point that transducer is positioned over test block side is penetrated, standard transducer and tested sensor are positioned over to the opposite side of test block, its
In, acoustic emission transducer is connected with acoustic emission system；Second detection unit, for the feelings in acoustic emission system output pulse signal
Under condition, the frequency response of examination criteria sensor and tested sensor；Computing unit, for according to standard transducer and tested biography
The frequency response of sensor calculates the sensitivity of the ultrasonic measuring device with electricity of shelf depreciation.
Further, the device also includes：Second generation unit, it is sharp for after it is determined that detecting the sensitivity of main frame
Demarcation signal is produced with sinusoidal signal generator；Second adjustment unit, for keeping sinusoidal signal generator output waveform not
In the case of change, the level of adjustment pulse output；3rd determining unit, for according in shelf depreciation TEV measuring device with electricitys
The sensitivity of shelf depreciation TEV measuring device with electricitys is determined for inputting the distinguishable peak level of minimum pulse signal.
In embodiments of the present invention, demarcation signal is produced by using impulse generator；Keeping impulse generator output
In the case that waveform is constant, the level of adjustment pulse output；Detection main frame in live testing apparatus for local discharge for
The distinguishable peak level for inputting minimum pulse signal determines the sensitivity of detection main frame, has reached accurate detection shelf depreciation band
The purpose of the sensitivity of electric detection means, and then solve sensitivity in correlation technique to live testing apparatus for local discharge
The relatively low technical problem of accuracy in detection, it is achieved thereby that the detection for improving the sensitivity of live testing apparatus for local discharge is accurate
The technique effect of exactness.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of the sensitivity detection method of live testing apparatus for local discharge according to embodiments of the present invention；
Fig. 2 is superfrequency detecting system Sensitivity Calibration platform schematic diagram according to embodiments of the present invention；
Fig. 3 is detection sensitivity wiring diagram according to embodiments of the present invention；
Fig. 4 is shelf depreciation ultrasound measuring instrument sensitivity test wiring diagram according to embodiments of the present invention；
Fig. 5 is TEV detecting systems test wiring diagram according to embodiments of the present invention；And
Fig. 6 is the schematic diagram of the sensitivity detector of live testing apparatus for local discharge according to embodiments of the present invention.
Embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model that the present invention is protected
Enclose.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or
Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Lid is non-exclusive to be included, for example, the process, method, system, product or the equipment that contain series of steps or unit are not necessarily limited to
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or the intrinsic other steps of equipment or unit.
There is provided a kind of method of the sensitivity detection method of live testing apparatus for local discharge according to embodiments of the present invention
Embodiment, can be in such as one group computer executable instructions the step of the flow of accompanying drawing is illustrated, it is necessary to explanation
Performed in computer system, and, although logical order is shown in flow charts, but in some cases, can be with not
The order being same as herein performs shown or described step.
Fig. 1 is the flow chart of the sensitivity detection method of live testing apparatus for local discharge according to embodiments of the present invention,
As shown in figure 1, this method comprises the following steps：
Step S102, demarcation signal is produced using impulse generator；
Step S104, in the case where keeping impulse generator output waveform constant, the level of adjustment pulse output；
Step S106, detection main frame in live testing apparatus for local discharge can for input minimum pulse signal
Differentiate the sensitivity that peak level determines detection main frame.
Pass through above-mentioned steps, it is possible to achieve the purpose of the sensitivity of accurate detection live testing apparatus for local discharge, and then
The relatively low technical problem of the accuracy in detection of sensitivity in correlation technique to live testing apparatus for local discharge is solved, so that
Realize the technique effect of the accuracy in detection for the sensitivity for improving live testing apparatus for local discharge.
As a kind of alternatively embodiment, it is determined that after the sensitivity of detection main frame, the embodiment can also include：It is right
Field strength of the demarcation signal source in effective output area under each output level in gtem cell is demarcated, and sets up demarcation source defeated
Go out the mapping relations of level and gtem cell monitoring point field strength；Demarcation signal source output level is adjusted, until shelf depreciation is extra-high
Frequency band electric detection means reflects demarcation signal with the signal to noise ratio more than or equal to 2, and obtains current incident field intensity, wherein, it is incident
Field strength is used for the sensitivity for indicating partial-discharge ultrahigh-frequency measuring device with electricity.
It should be noted that can realize that accurate detection partial-discharge ultrahigh-frequency live detection is filled by the alternative embodiment
The sensitivity put.
As a kind of alternatively embodiment, it is determined that after the sensitivity of detection main frame, the embodiment can also include：Profit
Partial discharge pulse's signal is simulated with the output of steep wave generator, wherein, pulse signal is inputted to coupled capacitor device by electric capacity；
The high-frequency current signal produced by steep wave generator is detected on the ground wire of coupled capacitor device using detecting instrument；Returned currently
When the apparent charge amount that road is simulated is first threshold, determine that detecting instrument shows the signal to noise ratio of high-frequency current signal, wherein,
Signal to noise ratio is used for the sensitivity for indicating shelf depreciation high frequency electric measuring device with electricity.
It should be noted that accurate detection shelf depreciation high frequency electric live detection can be realized by the alternative embodiment
The sensitivity of device.
As a kind of alternatively embodiment, it is determined that after the sensitivity of detection main frame, the embodiment can also include：Will
Acoustic emission transducer is positioned over the central point of test block side, and standard transducer is positioned over into the another of test block with tested sensor
Side, wherein, acoustic emission transducer is connected with acoustic emission system；In the case of acoustic emission system output pulse signal, detection mark
The frequency response of quasi- sensor and tested sensor；Local put is calculated according to the frequency response of standard transducer and tested sensor
The sensitivity of electric ultrasound measuring device with electricity.
It should be noted that the accurate ultrasonic measuring device with electricity of detection shelf depreciation can be realized by the alternative embodiment
Sensitivity.
As a kind of alternatively embodiment, it is determined that after the sensitivity of detection main frame, the embodiment can also include：Profit
Demarcation signal is produced with sinusoidal signal generator；In the case where keeping sinusoidal signal generator output waveform constant, arteries and veins is adjusted
Rush the level of output；According to electric for inputting the distinguishable peak value of minimum pulse signal in shelf depreciation TEV measuring device with electricitys
The flat sensitivity for determining shelf depreciation TEV measuring device with electricitys.
It should be noted that accurate detection shelf depreciation TEV measuring device with electricitys can be realized by the alternative embodiment
Sensitivity.
The embodiment of the present invention additionally provides a kind of preferred embodiment, and the preferred embodiment will be described in detail below：
The key parameter of shelf depreciation electrification detection system includes sensitivity, the detecting system linearity, the inspection of detecting system
The dynamic range of examining system, the real-time of detecting system, detecting system interference free performance, the diagnostic accuracy of detecting system, inspection
Positioning function, reliability, stability of examining system etc..The reliability and stability of wherein detecting system belong to type experiment
Content, including environmental suitability, electromagnetism reliability, the repeatability of measurement etc., this belongs to any instrument and is required for the general of examination
Index, therefore here without specific considerations.Detecting system sensitivity will be introduced below.
The sensitivity of detecting system reflects the ability that instrument can detect minimum discharge signal, and the parameter is sensitive by sensor
The combined factors such as degree, detection frequency band, conditioner bandwidth and gain, acquisition system are determined.
1st, main frame sensitivity is detected
Sensitivity for detecting main frame, can be Network Analyzer by being determined by way of exporting swept-frequency signal.
Specifically method of testing is：
Network Analyzer is calibrated first；
The scope frequency scanned according to the detection band setting of Network Analyzer；
Selection measurement parameter is S11 or S12 (the signal output function of only needing Network Analyzer here)；
The voltage level of Network Analyzer output signal is adjusted, such as from -80dBm-0dBm；
According to resolution capability of the detection main frame for input minimum signal, its detection sensitivity is determined.
Because in Partial Discharge Detection, the identification of suppression and pulse signal for narrow-band interference signal considers, some instrument
The detection main frame of device is provided with waveform recognition function in gatherer process, and the narrow frequency or swept-frequency signal that net point is exported can be taken as dry
Disturb signal directly to filter out, therefore do not support the test with sweep method to its sensitivity.Now, preferably using impulse response measurement
Mode carries out the sensitivity test of main frame, i.e., produce demarcation signal using impulse generator, is keeping impulse generator output wave
On the premise of shape is constant, the level of adjustment pulse output, according to resolved peak of the detection main frame for input minimum pulse signal
It is worth level, determines its detection sensitivity, represented with dBmV.
2nd, system sensitivity
For the test of whole system sensitivity, it should finally be tested in the case of sensor access host.In view of
Frequency band, the gain of different instrument manufacturer facility men etc. are different, therefore directly can not by the amplitude of sensor detection signal
Illustrate the sensitivity of detecting system, and table from detected signal physical essence should be given according to the principle of different detection methods
Levy.We prefer that the sensitivity come in the following way to detecting system is characterized：
(1)UHF：The unified Pulse Calibration waveform of regulation, herein under the premise of the minimum pulse that can be detected with detecting system
Field strength peak value is used as the sensitivity of detecting system, unit V/m (or dBV/m).
This current parameter index is adopted by the standard of State Grid Corporation of China, and specific method of testing is：
The test of partial-discharge ultrahigh-frequency detecting system sensitivity is carried out using gtem cell.Gtem cell can not only shield
Cover external interference, and the structure of its transiens transmission wire type is conducive to eliminating the influence of signal catadioptric and propagation attenuation, mark
Fixed platform is as shown in Figure 2.
According to said detecting system sensitivity definition, under same test environment conditions, detecting system can be told
Transient electric field intensity peak it is smaller, then faint local discharge signal can effectively be detected by showing that detecting system is got over, i.e., its from
The signal to noise ratio of body and sensitivity are more superior., must be in advance to mark in order to more facilitate the sensitivity for intuitively evaluating detecting system
Determine system platform to be demarcated, specific method is：
Field strength of the demarcation signal source in its effective output area under each output level in gtem cell is demarcated, built
Day-mark determines the mapping relations of source output level and gtem cell test point field strength, can specifically be visited by below equation by monopole standard
The output U of pinoIt is counter to push away,
In formula, UoIt is sensor output voltage uo(t) FFT value, HrefFor the frequency response curve of reference sensor, by Ei
The time domain waveform E of in-field can be tried to achievei(t)。
Demarcation source output level is adjusted, until detecting system can reliably reflect demarcation letter with the signal to noise ratio not less than 2
Number, incident field intensity now is drawn, the field strength is the sensitivity of detecting system.
According to a large amount of investigations and actual measurement, the waveform of pulse is exported for demarcation source, recommends to be not more than using rise time
Between 0.3ns, pulse half wave width 1ns-100ns, impulse amplitude output area is not less than 0-200V, especially 0-5V it
Between degree of regulation be not less than 10mV.
(2) high frequency electric detecting system：State Grid Corporation of China advises in the draft standard of high frequency electric live detection instrument
It is fixed：Signal to noise ratio during detection 50pC local discharge signals is not lower than 2:1 (or 6dB).Produced in view of different discharging models
Simulation discharge signal there is the quantization for recommending method similar with UHF as follows to enter line sensitivity in very big dispersiveness, standard
Examination, elementary diagram is as shown in Figure 3.
Steep wave generator output simulation partial discharge pulse signal Vs, coupled capacitor device Ck is applied to by injecting electric capacity C0
On, as the high-frequency current signal produced by detector detects steep wave generator on the ground wire of coupled capacitor device.Test loop
The apparent charge amount simulated is Vs × C0, wherein, the peak value of pulse of Vs steep waves generator output, C0 is injection capacitance.Will
Ask when apparent charge amount is 100pF, detector can be to be not less than 2:1 (or 6dB) signal to noise ratio shows measured signal, and letter
Make an uproar than higher, detection sensitivity is also higher.
Each instrument in test loop should meet following requirement：
The amplitude of steep wave generator output pulse should be adjustable, and rising edge (10%-90%) should be no more than 10ns, die-away time
(90%-10%) should be between 50ns-200ns, and the repetition rate of output pulse should be set to the integral multiple of power frequency period.
Injection electric capacity C0 preferably selects 100pF high-frequency ceramics electric capacity (error is no more than ± 2%).
Coupled capacitor Ck preferably selects the noninductive capacitor that capacitance is not less than 2000pF.
(3) ultrasound partial discharge detecting system：According to the quasi- QGDW11061-2013 regulations of state's network mark, supersonic reflectoscope is in ultrasound
Under signal incentive action, the ratio of output voltage values and excitation value, generally with dB (V/ (m/s)) for unit, excitation value is typically selected
Use speed unit m/s.
The wiring of detecting system is as shown in Figure 4.
Experiment test block preferably uses steel material (hot-rolled steel A36), and test block thickness is preferably not less than 250mm.Acoustic emission transducer
The central point of test block side is positioned over, and is connected to acoustic emission system.The sensor of gauge measurement system and tested instrument is symmetrical
It is positioned over test block opposite side.Couplant is added between sensor and test block.Acoustic emission system output set of pulses width is not less than
1us, amplitude are not less than 5V pulse signal, measure tested instrument and frequency response U (f), the S (f) of gauge measurement system.Calculate
The sensitivity D (f) of tested instrument:
D (f)=S0 (f) * U (f)/S (f) (2)
In formula, S0 (f) is the demarcation sensitivity of mark measuring system.
Its peak sensitivity D (fm) and average sensitivity are obtained by the sensitivity D (f) for being tested instrument.During calculating, SF6 its
The supersonic reflectoscope selection frequency band range 20k-80kHz of his insulating power equipment.The frequency band range 80k- of oil-filled equipment detection
200kHz.Standard is provided：Peak sensitivity is typically no less than 60dB (V/ (m/s)), and average sensitivity is typically no less than 40dB (V/
(m/s))。
(4) TEV partial discharge detecting systems：According to Q GDW 11063-2013《Transient state low-voltage Partial discharge detector technology
Specification》, the measurement sensitivity of TEV detecting systems is not less than 0dBmV.Test wiring as shown in Figure 5.
Also pulse signals generator, metallic plate etc. are distinctly claimed in standard.Such as impulse generator：Pulse is repeated
Frequency 25Hz-10kHz, polarity energy sign change, impulse waveform rising time tr is not more than 0.1us, and fall time tf should not
Less than 100us, voltage pulse output peak value is adjustable between 10mV-5V.Metallic plate is galvanized iron sheet, long 300mm, wide 300mm,
Thick 3mm (processing of corner arc shape).
Not to one progress concrete regulation of sensitivity in experimental method standard.In view of TEV sensitivity measures are various with other
The similitude of method, the process of sensitivity test is also similar with above-mentioned each method, by adjusting signal source output amplitude, finds
TEV detecting systems can have it is distinguishable in the case of minimum output amplitude.
According to embodiments of the present invention, a kind of dress of the sensitivity detector of live testing apparatus for local discharge is additionally provided
Embodiment is put, it is necessary to which explanation, the sensitivity detector of the live testing apparatus for local discharge can be used for performing this hair
Shelf depreciation in the sensitivity detection method of live testing apparatus for local discharge in bright embodiment, the embodiment of the present invention is powered
The sensitivity detection method of detection means can be performed in the sensitivity detector of the live testing apparatus for local discharge.
Fig. 6 is the schematic diagram of the sensitivity detector of live testing apparatus for local discharge according to embodiments of the present invention,
As shown in fig. 6, the device can include：
First generation unit 22, for producing demarcation signal using impulse generator；First adjustment unit 24, for protecting
Hold impulse generator output waveform it is constant in the case of, adjustment pulse output level；First determining unit 26, for according to office
Detection main frame in portion's electric discharge measuring device with electricity determines detection master for inputting the distinguishable peak level of minimum pulse signal
The sensitivity of machine.
It should be noted that the first generation unit 22 in the embodiment can be used for performing the step in the embodiment of the present application
The first adjustment unit 24 in rapid S102, the embodiment can be used for performing the step S104 in the embodiment of the present application, the implementation
The first determining unit 26 in example can be used for performing the step S106 in the embodiment of the present application.Above-mentioned module and corresponding step
The example realized is identical with application scenarios, but is not limited to above-described embodiment disclosure of that.
Alternatively, the device can also include：Unit is demarcated, for after it is determined that detecting the sensitivity of main frame, to mark
Determine field strength of the signal source in effective output area under each output level in gtem cell to be demarcated, set up the output of demarcation source
Level and the mapping relations of gtem cell monitoring point field strength；Adjustment unit, for adjusting demarcation signal source output level, Zhi Daoju
Portion's UHF band electric detection means that discharges reflects demarcation signal with the signal to noise ratio more than or equal to 2, and obtains current incident field intensity,
Wherein, incident field intensity is used for the sensitivity for indicating partial-discharge ultrahigh-frequency measuring device with electricity.
Alternatively, the device can also include：Analogue unit, for it is determined that after the sensitivity of detection main frame, utilizing
Steep wave generator output simulation partial discharge pulse signal, wherein, pulse signal is inputted to coupled capacitor device by electric capacity；The
One detection unit, the high-frequency electrical produced by for utilizing detecting instrument to detect steep wave generator on the ground wire of coupled capacitor device
Flow signal；Second determining unit, for when the apparent charge amount that current loop is simulated is first threshold, determining detecting instrument
The signal to noise ratio of high-frequency current signal is shown, wherein, signal to noise ratio is used to indicate shelf depreciation high frequency electric measuring device with electricity
Sensitivity.
Alternatively, the device can also include：Placement unit, for after it is determined that detecting the sensitivity of main frame, by sound
Transmitting transducer is positioned over the central point of test block side, and standard transducer and tested sensor are positioned over to the opposite side of test block,
Wherein, acoustic emission transducer is connected with acoustic emission system；Second detection unit, in acoustic emission system output pulse signal
In the case of, the frequency response of examination criteria sensor and tested sensor；Computing unit, for according to standard transducer with it is tested
The frequency response of sensor calculates the sensitivity of the ultrasonic measuring device with electricity of shelf depreciation.
Alternatively, the device can also include：Second generation unit, for it is determined that detection main frame sensitivity after,
Demarcation signal is produced using sinusoidal signal generator；Second adjustment unit, for keeping sinusoidal signal generator output waveform
In the case of constant, the level of adjustment pulse output；3rd determining unit, for according to shelf depreciation TEV measuring device with electricitys
In determine the sensitivity of shelf depreciation TEV measuring device with electricitys for inputting the distinguishable peak level of minimum pulse signal.
Pass through said units, it is possible to achieve the purpose of the sensitivity of accurate detection live testing apparatus for local discharge, and then
The relatively low technical problem of the accuracy in detection of sensitivity in correlation technique to live testing apparatus for local discharge is solved, so that
Realize the technique effect of the accuracy in detection for the sensitivity for improving live testing apparatus for local discharge.
The embodiments of the present invention are for illustration only, and the quality of embodiment is not represented.
In the above embodiment of the present invention, the description to each embodiment all emphasizes particularly on different fields, and does not have in some embodiment
The part of detailed description, may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents, others can be passed through
Mode is realized.Wherein, device embodiment described above is only schematical, such as division of described unit, Ke Yiwei
A kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual
Between coupling or direct-coupling or communication connection can be the INDIRECT COUPLING or communication link of unit or module by some interfaces
Connect, can be electrical or other forms.
The unit illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On unit.Some or all of unit therein can be selected to realize the purpose of this embodiment scheme according to the actual needs.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If the integrated unit is realized using in the form of SFU software functional unit and as independent production marketing or used
When, it can be stored in a computer read/write memory medium.Understood based on such, technical scheme is substantially
The part contributed in other words to prior art or all or part of the technical scheme can be in the form of software products
Embody, the computer software product is stored in a storage medium, including some instructions are to cause a computer
Equipment (can for personal computer, server or network equipment etc.) perform each embodiment methods described of the invention whole or
Part steps.And foregoing storage medium includes：USB flash disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can be with store program codes
Medium.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of sensitivity detection method of live testing apparatus for local discharge, it is characterised in that including：
Demarcation signal is produced using impulse generator；
In the case where keeping the impulse generator output waveform constant, the level of adjustment pulse output；
Distinguishable peak level of the main frame for input minimum pulse signal is detected in live testing apparatus for local discharge
Determine the sensitivity of the detection main frame.
It is described 2. according to the method described in claim 1, it is characterised in that it is determined that after the sensitivity of the detection main frame
Method also includes：
Field strength of the demarcation signal source in effective output area under each output level in gtem cell is demarcated, mark is set up
Determine the mapping relations of source output level and gtem cell monitoring point field strength；
Demarcation signal source output level is adjusted, until partial-discharge ultrahigh-frequency measuring device with electricity is with the letter more than or equal to 2
Make an uproar than reflection demarcation signal, and obtain current incident field intensity, wherein, the incident field intensity is used to indicate that the shelf depreciation is special
The sensitivity of high frequency measuring device with electricity.
It is described 3. according to the method described in claim 1, it is characterised in that it is determined that after the sensitivity of the detection main frame
Method also includes：
Using steep wave generator output simulation partial discharge pulse signal, wherein, the pulse signal is inputted to coupling by electric capacity
Close on capacitor；
The high frequency electric produced by the steep wave generator is detected on the ground wire of the coupled capacitor device using detecting instrument
Signal；
When the apparent charge amount that current loop is simulated is first threshold, determine that the detecting instrument shows the high-frequency electrical
The signal to noise ratio of signal is flowed, wherein, the signal to noise ratio is used for the sensitivity for indicating shelf depreciation high frequency electric measuring device with electricity.
It is described 4. according to the method described in claim 1, it is characterised in that it is determined that after the sensitivity of the detection main frame
Method also includes：
Acoustic emission transducer is positioned over to the central point of test block side, standard transducer and tested sensor are positioned over the examination
The opposite side of block, wherein, the acoustic emission transducer is connected with acoustic emission system；
In the case of the acoustic emission system output pulse signal, the standard transducer and the tested sensor are detected
Frequency response；
The ultrasonic measuring device with electricity of shelf depreciation is calculated according to the frequency response of the standard transducer and the tested sensor
Sensitivity.
It is described 5. according to the method described in claim 1, it is characterised in that it is determined that after the sensitivity of the detection main frame
Method also includes：
Demarcation signal is produced using sinusoidal signal generator；
In the case where keeping the sinusoidal signal generator output waveform constant, the level of adjustment pulse output；
According to being determined the distinguishable peak level in shelf depreciation TEV measuring device with electricitys for input minimum pulse signal
The sensitivity of shelf depreciation TEV measuring device with electricitys.
6. a kind of sensitivity detector of live testing apparatus for local discharge, it is characterised in that including：
First generation unit, for producing demarcation signal using impulse generator；
First adjustment unit, in the case where keeping the impulse generator output waveform constant, adjustment pulse to be exported
Level；
First determining unit, for the detection main frame in live testing apparatus for local discharge for input minimum pulse signal
Distinguishable peak level determine it is described detection main frame sensitivity.
7. device according to claim 6, it is characterised in that described device also includes：
Demarcate unit, for it is determined that it is described detection main frame sensitivity after, to demarcation signal source in effective output area
Field strength under each output level in gtem cell is demarcated, and sets up demarcation source output level and gtem cell monitoring point field strength
Mapping relations；
Adjustment unit, for adjusting demarcation signal source output level, until partial-discharge ultrahigh-frequency measuring device with electricity with
Signal to noise ratio reflection demarcation signal more than or equal to 2, and current incident field intensity is obtained, wherein, the incident field intensity is used to indicate
The sensitivity of the partial-discharge ultrahigh-frequency measuring device with electricity.
8. device according to claim 6, it is characterised in that described device also includes：
Analogue unit, for it is determined that after the sensitivity of the detection main frame, being put using the output simulation of steep wave generator is local
Electric impulse signal, wherein, the pulse signal is inputted to coupled capacitor device by electric capacity；
First detection unit, for detecting the steep wave generator on the ground wire of the coupled capacitor device using detecting instrument
Produced high-frequency current signal；
Second determining unit, for when the apparent charge amount that current loop is simulated is first threshold, determining the detector
Device shows the signal to noise ratio of the high-frequency current signal, wherein, the signal to noise ratio is used to indicate that shelf depreciation high frequency electric is powered
The sensitivity of detection means.
9. device according to claim 6, it is characterised in that described device also includes：
Placement unit, for it is determined that after the sensitivity of the detection main frame, acoustic emission transducer is positioned over into test block side
Central point, standard transducer and tested sensor are positioned over to the opposite side of the test block, wherein, the acoustic emission transducer
It is connected with acoustic emission system；
Second detection unit, in the case of the acoustic emission system output pulse signal, detecting the standard transducer
With the frequency response of the tested sensor；
Computing unit, for calculating shelf depreciation ultrasound according to the frequency response of the standard transducer and the tested sensor
The sensitivity of measuring device with electricity.
10. device according to claim 6, it is characterised in that described device also includes：
Second generation unit, for it is determined that after the sensitivity of the detection main frame, mark is produced using sinusoidal signal generator
Determine signal；
Second adjustment unit, in the case where keeping the sinusoidal signal generator output waveform constant, adjustment pulse to be defeated
The level gone out；
3rd determining unit, for according to dividing for input minimum pulse signal in shelf depreciation TEV measuring device with electricitys
Distinguish that peak level determines the sensitivity of the shelf depreciation TEV measuring device with electricitys.
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