CN104375067B - A kind of loop-network switch cabinet local discharge detection device and method - Google Patents
A kind of loop-network switch cabinet local discharge detection device and method Download PDFInfo
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Abstract
The present invention provides a kind of loop-network switch cabinet local discharge detection device, including sensor group, multi signal conditioning unit, data acquisition unit, data processing unit and display unit；Sensor group includes transient earth voltage, ultrasonic, superfrequency and/or High Frequency Current Sensor, obtains detection signal；Detection signal is modulated into pulse signal by multi signal conditioning unit, and obtains peak value and the phase place of pulse signal；Pulse signal is converted into digital signal by data acquisition unit；Digital signal is processed by data processing unit, detects and is obtained by transient earth voltage or sonac, output amplitude shows to display unit；Detect and obtained by superfrequency or High Frequency Current Sensor, output amplitude, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates show to display unit.Implement the embodiment of the present invention, accurately and quickly can distinguish local discharge signal from complicated detection signal, reduce the error of detection, improve work efficiency.
Description
Technical field
The present invention relates to loop-network switch cabinet Partial Discharge Detecting Technology field, more particularly, to a kind of loop-network switch cabinet local is put
Electric detection means and method.
Background technology
In power system, loop networks switch cabinet equipment is most of to be installed out of doors, because running environment is severe, by external rings
Border (temperature, humidity, filth) affects larger, is subject to the double influence of built-in electrical insulation and external environment that local will be led to put simultaneously
Electricity, therefore needs the running status by the detection of shelf depreciation is judged effectively with loop-network switch cabinet.
At present, the detection method for local discharge of loop networks switch cabinet equipment includes transient earth voltage detection and supersonic testing method,
Transient earth voltage detection method detects the electromagnetic signal in the range of the frequency 3MHz to 100MHz that shelf depreciation produces, detection transient state ground
The amplitude of voltage, umber of pulse, the order of severity；Supersonic testing method detects that the mid frequency that shelf depreciation produces is the ultrasonic of 40kHz
Signal, the virtual value of detection ultrasonic signal, maximum, frequency content, original waveform.The shortcoming of above two detection method exists
In：The amplitude of detection signal can only be detected, the display of no various correlation collection of illustrative plates, because detection signal includes local discharge signal
And interference signal, therefore can only judge to exist abnormal signal, but cannot determine whether for local discharge signal.Therefore, need badly
A kind of instrument can accurately and quickly detect the local discharge signal on loop networks switch cabinet equipment.
Content of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of loop-network switch cabinet local discharge detection device
And method, accurately and quickly can distinguish local discharge signal from complicated detection signal, reduce the error of detection,
Improve work efficiency.
In order to solve above-mentioned technical problem, embodiments provide a kind of loop-network switch cabinet Partial Discharge Detection dress
Put, including sensor group, multi signal conditioning unit, data acquisition unit, data processing unit and display unit；Wherein,
Described sensor group includes transient earth voltage sensor, sonac, extra-high video sensor and/or high frequency electric
Sensor, each sensor in described sensor group is all connected with the input of described multi signal conditioning unit, for obtaining
The detection signal that loop-network switch cabinet produces；
The outfan of described multi signal conditioning unit is connected with the input of described data acquisition unit, for obtaining described
The detection signal got is modulated into pulse signal, and obtains peak value and the phase place of described pulse signal；
The outfan of described data acquisition unit is connected with the input of described data processing unit, for by described pulse
Signal is converted into digital signal；
The outfan of described data processing unit is connected with described display unit, for being processed described digital signal
Afterwards, when the detection signal conversion that described digital signal is obtained is detected by transient earth voltage sensor or sonac, output
The amplitude of described digital signal to described display unit shows；Or
When the detection signal conversion that described digital signal is obtained is detected by extra-high video sensor or High Frequency Current Sensor,
Amplitude, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates to the described display unit exporting described digital signal shows；
Wherein, described multi signal conditioning unit includes a simulation detecting circuit, and described simulation detecting circuit is included every directly electricity
Appearance, biasing circuit, high frequency detector diode, integrating capacitor and load；Wherein,
The input of described capacitance is connected with described sensor group, and outfan is defeated with described high frequency detector diode
Enter end to be connected；
Described integrating capacitor loads and is unified into a discharge loop with described, and one end of described discharge loop is grounded, another
End respectively with one end of described biasing circuit, the outfan of described high frequency detector diode and for exporting described detection signal
Signal output part is connected；
The other end of described biasing circuit is connected with a power supply.
Wherein, described device also includes a radio frequency identification unit, described radio frequency identification unit and described data
Processing unit is connected, for identifying the electronic tag on loop-network switch cabinet.
Wherein, the detection signal that described extra-high video sensor obtains is the electromagnetism letter in the range of frequency 0.3GHz to 1.5GHz
Number.
Wherein, the detection signal that described High Frequency Current Sensor obtains is the high frequency in the range of frequency 0.5GHz to 50MHz
Pulsed current signal.
Wherein, described device also includes a wireless type power synchronization signal generator, for adjusting described detection signal is
The signal source equal with its power frequency locking phase, and send to opposite end receiving device and be analyzed and process.
The embodiment of the present invention additionally provides a kind of loop-network switch cabinet detection method for local discharge it is characterised in that it is front
Realize in the device stated, methods described includes：
Obtain the test value of the detection signal that loop-network switch cabinet produces by the transient earth voltage sensor in described device；
Judge whether the test value of the detection signal of described acquisition is more than default threshold value；
If it is, the extra-high video sensor passing through further in described device obtains the inspection that described loop-network switch cabinet produces
Survey amplitude, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or the PRPS collection of illustrative plates of signal；
The distance between mobile described device and described loop-network switch cabinet, as phase place collection of illustrative plates, the PRPD of described detection signal
Figure on collection of illustrative plates and/or PRPS collection of illustrative plates is in regularity distribution it is determined that described detection signal is locally to put in multiple phase places
The signal of telecommunication.
Wherein, methods described further includes：
The distance between mobile described device and described loop-network switch cabinet, as phase place collection of illustrative plates, the PRPD of described detection signal
Figure on collection of illustrative plates and/or PRPS collection of illustrative plates is in dispersibility distribution it is determined that described detection signal is interference letter in multiple phase places
Number.
The embodiment of the present invention provides a kind of loop-network switch cabinet detection method for local discharge it is characterised in that it is front again
Realize in the device stated, methods described includes：
Obtain the test value of the detection signal that loop-network switch cabinet produces by the transient earth voltage sensor in described device；
Judge whether the test value of the detection signal of described acquisition is more than default threshold value；
If it is, being combined by the sonac in described device and High Frequency Current Sensor further, obtain
The amplitude of detection signal, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates that described loop-network switch cabinet produces；
The distance between mobile described device and described loop-network switch cabinet, as phase place collection of illustrative plates, the PRPD of described detection signal
Figure on collection of illustrative plates and/or PRPS collection of illustrative plates is in regularity distribution it is determined that described detection signal is locally to put in multiple phase places
The signal of telecommunication.
Wherein, methods described further includes：
The distance between mobile described device and described loop-network switch cabinet, as phase place collection of illustrative plates, the PRPD of described detection signal
Figure on collection of illustrative plates and/or PRPS collection of illustrative plates is in dispersibility distribution it is determined that described detection signal is interference letter in multiple phase places
Number.
Implement the embodiment of the present invention, have the advantages that：
In embodiments of the present invention, due to adopting sensor group to gather the detection signal that loop-network switch cabinet produces in device,
When detection signal is not known for local discharge signal using transient earth voltage and supersonic testing method, superfrequency can be passed through further
Sensor or High Frequency Current Sensor obtain the phase place collection of illustrative plates of detection signal, the PRPD (Phase that loop-network switch cabinet produces
Resolved Peak Display, local phase feature) collection of illustrative plates and/or PRPS (Phase Resolved Pulse
Sequence, nervuration phase property) collection of illustrative plates determining the type of detection signal, therefore, it is possible to from complicated detection signal accurately
And quickly distinguish local discharge signal, reduce the error of detection, improve work efficiency.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, according to
These accompanying drawings obtain other accompanying drawings and still fall within scope of the invention.
A kind of structural representation of loop-network switch cabinet local discharge detection device that Fig. 1 provides for the embodiment of the present invention one；
Fig. 2 is the structural representation of detecting circuit in multi signal conditioning unit in Fig. 1；
Fig. 3 is the circuit connection diagram of detecting circuit application scenarios in Fig. 2；
A kind of flow chart of loop-network switch cabinet detection method for local discharge that Fig. 4 provides for the embodiment of the present invention two；
A kind of flow chart of loop-network switch cabinet detection method for local discharge that Fig. 5 provides for the embodiment of the present invention three.
Specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is made into one
Step ground describes in detail.
As shown in figure 1, a kind of loop-network switch cabinet local discharge detection device providing for the embodiment of the present invention one, including biography
Sensor group 1, multi signal conditioning unit 2, data acquisition unit 3, data processing unit 4 and display unit 5；Wherein,
Sensor group 1 includes transient earth voltage sensor 11, sonac 12, extra-high video sensor 13 and/or high frequency
Current sensor 14, each sensor in sensor group 1 is all connected with the input of multi signal conditioning unit 2, for obtaining
The detection signal that loop-network switch cabinet (not shown) produces；
The outfan of multi signal conditioning unit 2 is connected with the input of data acquisition unit 3, for by the detection getting
Signal modulation becomes pulse signal, and obtains peak value and the phase place of pulse signal；
The outfan of data acquisition unit 3 is connected with the input of data processing unit 4, for being converted into pulse signal
Digital signal；
The outfan of data processing unit 4 is connected with display unit 5, after being processed digital signal, detects
During the detection signal conversion that this digital signal is obtained by transient earth voltage sensor 11 or sonac 12, output digit signals
Amplitude show to display unit 5；Or
When the detection signal conversion that digital signal is obtained is detected by extra-high video sensor 13 or High Frequency Current Sensor 14,
The amplitude of output digit signals, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates show to display unit.
It should be noted that sensor can one or more be applied in combination, during being applied in combination, all first pass through transient state
Ground voltage sensor 11 obtains the test value of detection signal first, then passes sequentially through super by extra-high video sensor 13 mode or again
The mode that sonic transducer 12 is combined with High Frequency Current Sensor 14, obtains the amplitude after detection signal turns digital signal, phase place
Collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates, so that it is determined that the size of detection signal and type.
The mode that in sensor group 1, sensor is detected to loop-network switch cabinet shelf depreciation is as follows：
(1) using transient earth voltage sensor 11, loop-network switch cabinet shelf depreciation is detected.Will be temporarily in detection process
State ground voltage sensor 11 is contacted with loop-network switch cabinet, guarantees transient earth voltage sensor 11 and switch cubicle metal in detection process
Panel is in close contact, and should be close proximity on the metal decking of the easy leakage position of the Partial discharge signals such as observation window, ventilating blind.If
The larger situation of detection numerical value occurs it is proposed that measuring more than three times to determine test result, by amplitude, umber of pulse etc. to local
Discharge magnitude is judged.
(2) using sonac 12, loop-network switch cabinet shelf depreciation is detected.Sonac 12 should close set
Standby outer surface gap (should not be close to, to ensure that sonac 12 and equipment room have air duct), in test process, Ying Bao
Hold sonac 12 resting state, it is to avoid because sonac 12 effect of jitter test result；Ultrasound wave in detection process
Sensor 12 should retain enough safe distances with palpus between equipment high pressure.By the judgement such as amplitude, frequency content, collection of illustrative plates office
Portion's discharge magnitude and type, if necessary scalable amplification detected.
(3) using extra-high video sensor 13, loop-network switch cabinet shelf depreciation is detected.Extra-high video sensor 13 should paste
Outside equipment surface nonmetallic materials, the detection signal of acquisition is the electromagnetic signal in the range of frequency 0.3GHz to 1.5GHz,
In detection process, extra-high video sensor 13 should retain enough safe distances with palpus between equipment high pressure.By amplitude, collection of illustrative plates
Deng judging shelf depreciation size and type, scalable detection bandwidth, gain etc. if necessary is detected.
(4) using high frequency sensors 14, loop-network switch cabinet shelf depreciation is detected.High frequency sensors 14 should be stuck in outer
Tested on portion's cable body or earth lead, the detection signal of acquisition is the high frequency arteries and veins in the range of frequency 0.5GHz to 50MHz
Rush current signal, detection process medium-high frequency sensor 14 should retain enough safe distances with palpus between equipment high pressure.Pass through
Amplitude, collection of illustrative plates etc. judge shelf depreciation size and type, and adjustable gain etc. is detected if necessary.
For the signal characteristic of dissimilar sensor, corresponding signal condition and Acquisition Circuit need to be separately designed.Due to
The signal frequency of sensor is generally higher, and is confined to the capacity of data acquisition and storage medium, to observation signal always
Original waveform, then be difficult to take into account the requirement of high sampling and data storage amount.In order to realize the continuous inspection of many power frequency periods
Survey, by design simulation detecting circuit, detect and keep the peak value of oscillation pulse signal, and continuation width signal duration,
To meet the bandwidth requirement to collection signal for the general digital acquisition system, as shown in Fig. 2 therefore multi signal conditioning unit 2 includes
One simulation detecting circuit, simulation detecting circuit includes capacitance 21, biasing circuit 22, high frequency detector diode 23, integration electricity
Hold 24 and load 25；Wherein,
The input of capacitance 21 is connected with sensor group 1, the input phase of outfan and high frequency detector diode 23
Even；
Integrating capacitor 24 with load 25 and is unified into a discharge loop, and one end ground connection of discharge loop, the other end respectively with
One end of biasing circuit 22, the outfan of high frequency detector diode 23 and for export detection signal signal output part be connected；
The other end of biasing circuit 23 is connected with a power supply.
As an example, as shown in figure 3, the detecting circuit application to multi signal conditioning unit 2 in the embodiment of the present invention
Scene further illustrates：
In figure, C1 is capacitance, and C2 is integrating capacitor, and C3 is to keep for signal peak, and R1 is in biasing circuit
Resistance, R2 is load, forms discharge loop with integrating capacitor C2, and D1 is high frequency detector diode, and D2 is Zener diode, Vcc
For power end；
High frequency Partial discharge signal excludes DC level through capacitance C1 coupling, by high frequency detector diode D1, by amassing
Divide electric capacity C2 electric current to be integrated process, keeping detection signal to export thus obtaining peak value by electric capacity C3, having widened this inspection
Survey effective time delay of signal.By power Vcc, the resistance R1 in biasing circuit provides bias voltage, in integration to current integration point
Electric capacity two ends C2 parallel resistance R2 forms discharge loop, and the time constant that peak value keeps is mated by integrating capacitor C2 and resistance R2
Arrive.
For the ease of asset management, therefore device also includes a radio frequency identification unit 6, radio frequency identification unit 6
It is connected with data processing unit 4, for identifying the electronic tag on loop-network switch cabinet.
In order to being analyzed to detection signal further and processing, therefore device also includes a wireless type line lock
Signal generator, is the signal source equal with its power frequency locking phase for adjusting detection signal, and send to opposite end receive set
Standby it is analyzed and processes.
It should be noted that this wireless type power synchronization signal generator should sensor group 1 obtain detection signal after,
It is connected with the sensor group 1 in device, multi signal conditioning unit 2, data acquisition unit 3 data processing unit 4 any of which.
As shown in figure 4, a kind of loop-network switch cabinet detection method for local discharge providing for the embodiment of the present invention two, it is front
Realize in the device stated, methods described includes：
Step S101, the detection signal being produced by the transient earth voltage sensor acquisition loop-network switch cabinet in described device
Test value；
Specifically, contact transient earth voltage sensor with loop-network switch cabinet, in detection process, guarantee that transient earth voltage passes
Sensor is in close contact with switch cubicle metal decking, and easily should leak close proximity to local discharge signals such as observation window, ventilating blind
On the metal decking at position, thus obtaining the test value of the detection signal of loop-network switch cabinet generation.
It should be noted that testing result on loop-network switch cabinet should be detected with the loop-network switch cabinet of other same types
Data is compared, or is compared with the detection data before loop-network switch cabinet itself.If the data of detection is more same than other
Model loop-network switch cabinet is big, or bigger than former result, just illustrates that this loop-network switch cabinet has discharge activities, and then infers event
The probability of barrier.
Step S102, judge that whether the test value of detection signal of described acquisition is more than default threshold value；If it is, holding
Row step S103；If it is not, then terminating；
Specifically, whether judging the test value of detection signal more than default threshold value, as an example, test value<
During 10DB, loop-network switch cabinet fault-free；10DB≤test value<During 20DB, pay close attention to and shorten detection cycle；Test value >=20DB
When, need to detect using extra-high video sensor.
Step S103, the extra-high video sensor passing through further in described device obtain the inspection that described loop-network switch cabinet produces
Survey amplitude, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or the PRPS collection of illustrative plates of signal；
Specifically, generally carry out extra-high video sensor loop-network switch cabinet is carried out local discharge signal measurement when, may
There are several typical local discharge signals as follows：Corona discharge, cavity discharge, the electric discharge of free metal granule and floating potential are put
Electricity etc..It is below the explanation of local discharge signal several ways, specific as follows：
A, corona discharge：The polar effect of discharge signal clearly, generally in negative half period or the positive half cycle of operating frequency phase
Occur, discharge signal intensity is weaker and PHASE DISTRIBUTION is wider, and discharge time is more.But another half cycle under high voltage grade
It is likely to occur discharge signal, amplitude is higher and PHASE DISTRIBUTION is narrower, and discharge time is less；
B, floating potential discharge：Discharge signal generally all occurs in the positive and negative half cycle of operating frequency phase, and have necessarily right
Title property, discharge signal amplitude is very big and neighbouring discharge signal interval is basically identical, and discharge time is few, and electric discharge repetitive rate is relatively
Low；Wherein, PRPS collection of illustrative plates has " interior eight words " or " toed-out " distribution characteristicss；
C, the electric discharge of free metal granule：Discharge signal polar effect is inconspicuous, and arbitrary phase is all distributed, discharge time
Few, discharge signal amplitude no evident regularity, discharge signal time interval is unstable.Improve electric pressure discharge signal amplitude to increase
But inter-spike intervals reduce.(note：When test to have granule discharge when, can assisting ultrasonic method detected and confirmed)；
D, cavity discharge：Discharge signal generally all occurs in the positive and negative half cycle of operating frequency phase, and has necessarily symmetrical
Property, discharge signal amplitude is relatively decentralized, and discharge time is less.
The distance between step S104, mobile described device and described loop-network switch cabinet, when the phase place of described detection signal
Figure on collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates is in regularity distribution it is determined that described detection signal in multiple phase places
For local discharge signal.
Specifically, extra-high during the distance between mobile device and loop-network switch cabinet it should be ensured that in device keeps pouring in
Sensor can get the detection signal of loop-network switch cabinet generation always, when discovery is in moving process, the phase place of detection signal
The regular distribution in multiple phase places of figure on collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates, then detection signal is local
Discharge signal.
It is local discharge signal with respect to distinguishing detection signal, can also distinguish between out detection signal is interference signal, institute
The method of stating further includes：
The distance between step S105, mobile described device and described loop-network switch cabinet, when the phase place of described detection signal
Figure on collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates is in dispersibility distribution it is determined that described detection signal in multiple phase places
For interference signal.
As shown in figure 5, a kind of loop-network switch cabinet detection method for local discharge providing for the embodiment of the present invention three, it is front
Realize in the device stated, methods described includes：
Step S201, the detection signal being produced by the transient earth voltage sensor acquisition loop-network switch cabinet in described device
Test value；
Specifically, contact transient earth voltage sensor with loop-network switch cabinet, in detection process, guarantee that transient earth voltage passes
Sensor is in close contact with switch cubicle metal decking, and easily should leak close proximity to local discharge signals such as observation window, ventilating blind
On the metal decking at position, thus obtaining the test value of the detection signal of loop-network switch cabinet generation.
It should be noted that testing result on loop-network switch cabinet should be detected with the loop-network switch cabinet of other same types
Data is compared, or is compared with the detection data before loop-network switch cabinet itself.If the data of detection is more same than other
Model loop-network switch cabinet is big, or bigger than former result, just illustrates that this loop-network switch cabinet has discharge activities, and then infers event
The probability of barrier.
Step S202, judge that whether the test value of detection signal of described acquisition is more than default threshold value；If it is, holding
Row step S203；If it is not, then terminating；
Specifically, whether judging the test value of detection signal more than default threshold value, as an example, test value<
During 10DB, loop-network switch cabinet fault-free；10DB≤test value<During 20DB, pay close attention to and shorten detection cycle；Test value >=20DB
When, need to combine to detect using sonac and High Frequency Current Sensor.
Step S203, combined by the sonac in described device and High Frequency Current Sensor further, obtain
The amplitude of detection signal, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates that described loop-network switch cabinet produces；
Specifically, generally carrying out sonac and High Frequency Current Sensor combines and loop-network switch cabinet is carried out with local
During discharge signal measurement, it is understood that there may be several typical local discharge signals as follows：Corona discharge, cavity discharge, free metal
Granule electric discharge and floating potential discharge etc..
It should be noted that ultrasonic signal produced by real shelf depreciation can be from earphone during carrying out ultrasound detection
In hear electric discharge rupture sound (sound of whistling), the stable maximum of ultrasound wave in this test should be recorded during record.And according to
The signals such as the sound of detection, amplitude, characteristic spectrum, judge the presence or absence of local discharge signal and the type of electric discharge.Using ultrasonic inspection
There is the defect of local discharge signal collection of illustrative plates in survey method, specific defect is as follows：
(I) suspended discharge：Under amplitude detection pattern, its signal virtual value, cycle peak are larger, there is an obvious frequency multiplication
Rate composition and doubled frequency composition, and doubled frequency composition is more than an overtones band composition；Under phase detection mode, its signal has
Significantly phase place building-up effect, shows as two clusters in a power frequency period, that is, has " bimodal " feature；Waveforms detection pattern
Under, its signal shows as the pulse signal of rule, two clusters, two cluster sizableness in a power frequency period.
(II) corona defect：Under amplitude detection pattern, its signal virtual value, cycle peak are larger, have obvious one times
Frequency content and doubled frequency composition, and an overtones band composition is more than doubled frequency composition；Under phase detection mode, its signal has
There is obvious phase place building-up effect, in a power frequency period, show as cluster, that is, there is " unimodal " feature；Waveforms detection pattern
Under, its signal shows as the pulse signal of rule, the big signal of cluster or cluster amplitude is significantly greater in a power frequency period,
Two significantly smaller cluster signals of cluster.
(III) free metal particle defects：Under amplitude detection pattern, its signal virtual value, cycle peak are larger, but 50Hz
Frequency content and 100Hz frequency content are inconspicuous；Under phase detection mode, its signal does not have obvious phase place building-up effect,
It is similar in one power frequency period and be uniformly distributed；Under waveforms detection pattern, its signal has obvious high impulse, but this pulse signal
Little with the relatedness of power-frequency voltage, it occurs thering is certain randomness；Under pulse detection pattern, its signal shows significantly
" triangle hump " shape.
In order to make up, the defect of local discharge signal collection of illustrative plates is had it is therefore desirable to examine with high frequency electric using supersonic testing method
Survey method matches, and gets local discharge signal and the embodiment of the present invention two of above-mentioned several ways using High Frequency Current Sensor
Middle using identical accessed by extra-high video sensor, detail refers to and adopts superfrequency to sense in the embodiment of the present invention two
Device gets the explanation of above-mentioned several ways local discharge signal, and this is no longer going to repeat them.
The distance between step S204, mobile described device and described loop-network switch cabinet, when the phase place of described detection signal
Figure on collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates is in regularity distribution it is determined that described detection signal in multiple phase places
For local discharge signal.
Specifically, the ultrasonic sensing during the distance between mobile device and loop-network switch cabinet it should be ensured that in device
Device or High Frequency Current Sensor all can get the detection signal that loop-network switch cabinet produces always, when discovery is in moving process
In, figure on the phase place collection of illustrative plates of detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates is regular point in multiple phase places
Cloth, then detection signal is local discharge signal.
It is local discharge signal with respect to distinguishing detection signal, can also distinguish between out detection signal is interference signal, because
This methods described further includes：
The distance between step S205, mobile described device and described loop-network switch cabinet, when the phase place of described detection signal
Figure on collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates is in dispersibility distribution it is determined that described detection signal in multiple phase places
For interference signal.
Implement the embodiment of the present invention, have the advantages that：
In embodiments of the present invention, due to adopting sensor group to gather the detection signal that loop-network switch cabinet produces in device,
When detection signal is not known for local discharge signal using transient earth voltage and supersonic testing method, superfrequency can be passed through further
Sensor or High Frequency Current Sensor obtain the phase place collection of illustrative plates of detection signal that loop-network switch cabinet produces, PRPD collection of illustrative plates and/or
PRPS collection of illustrative plates determining the type of detection signal, therefore, it is possible to accurately and quickly distinguish local from complicated detection signal
Discharge signal, reduces the error of detection, improves work efficiency.
One of ordinary skill in the art will appreciate that it is permissible for realizing all or part of step in above-described embodiment method
Instruct related hardware to complete by program, described program can be stored in a computer read/write memory medium,
Described storage medium, such as ROM/RAM, disk, CD etc..
Above disclosed be only present pre-ferred embodiments, certainly the right model of the present invention can not be limited with this
Enclose, the equivalent variations therefore made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (8)
1. a kind of loop-network switch cabinet local discharge detection device it is characterised in that include sensor group, multi signal conditioning unit,
Data acquisition unit, data processing unit and display unit；Wherein,
Described sensor group includes transient earth voltage sensor, sonac, extra-high video sensor and/or high frequency electric sensing
Device, each sensor in described sensor group is all connected with the input of described multi signal conditioning unit, for obtaining looped network
The detection signal that switch cubicle produces；
The outfan of described multi signal conditioning unit is connected with the input of described data acquisition unit, for getting described
Detection signal be modulated into pulse signal, and obtain peak value and the phase place of described pulse signal；
The outfan of described data acquisition unit is connected with the input of described data processing unit, for by described pulse signal
It is converted into digital signal；
The outfan of described data processing unit is connected with described display unit, after described digital signal is processed,
When the detection signal that described digital signal is detected be acquired in transient earth voltage sensor or sonac is converted into
When, amplitude to the described display unit exporting described digital signal shows；Or
When detect described digital signal be acquired in extra-high video sensor or High Frequency Current Sensor detection signal conversion
Become when, export the amplitude of described digital signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates to described display unit and show；
Wherein, described multi signal conditioning unit includes a simulation detecting circuit, and described simulation detecting circuit includes capacitance, partially
Circuits, high frequency detector diode, integrating capacitor and load；Wherein,
The input of described capacitance is connected with described sensor group, the input of outfan and described high frequency detector diode
It is connected；
Described integrating capacitor loads and is unified into a discharge loop, and one end ground connection of described discharge loop with described, and the other end divides
Not with one end of described biasing circuit, the outfan of described high frequency detector diode and the signal output for output pulse signal
End is connected；
The other end of described biasing circuit is connected with a power supply.
2. device as claimed in claim 1 is it is characterised in that described device also includes a radio frequency identification unit, described
Radio frequency identification unit is connected with described data processing unit, for identifying the electronic tag on loop-network switch cabinet.
3. device as claimed in claim 1 is it is characterised in that the detection signal that described extra-high video sensor obtains is frequency
Electromagnetic signal in the range of 0.3GHz to 1.5GHz.
4. device as claimed in claim 1 is it is characterised in that the detection signal that described High Frequency Current Sensor obtains is frequency
High-frequency pulse current signal in the range of 0.5 GHz to 50MHz.
5. a kind of loop-network switch cabinet detection method for local discharge is it is characterised in that it is in such as any one of Claims 1-4 institute
Realize in the device stated, methods described includes：
Obtain the test value of the detection signal that loop-network switch cabinet produces by the transient earth voltage sensor in described device；
Judge whether the test value of the detection signal of described acquisition is more than default threshold value；
If it is, the extra-high video sensor passing through further in described device obtains the detection letter that described loop-network switch cabinet produces
Number amplitude, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates；
The distance between mobile described device and described loop-network switch cabinet, as PRPD collection of illustrative plates and/or the PRPS of described detection signal
Figure on collection of illustrative plates is in regularity distribution it is determined that described detection signal is local discharge signal in multiple phase places.
6. method as claimed in claim 5 is it is characterised in that methods described further includes：
The distance between mobile described device and described loop-network switch cabinet, as PRPD collection of illustrative plates and/or the PRPS of described detection signal
Figure on collection of illustrative plates is in dispersibility distribution it is determined that described detection signal is interference signal in multiple phase places.
7. a kind of loop-network switch cabinet detection method for local discharge is it is characterised in that it is in such as any one of Claims 1-4 institute
Realize in the device stated, methods described includes：
Obtain the test value of the detection signal that loop-network switch cabinet produces by the transient earth voltage sensor in described device；
Judge whether the test value of the detection signal of described acquisition is more than default threshold value；
If it is, being combined by the sonac in described device and High Frequency Current Sensor further, obtain described
The amplitude of detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates that loop-network switch cabinet produces；
The distance between mobile described device and described loop-network switch cabinet, as PRPD collection of illustrative plates and/or the PRPS of described detection signal
Figure on collection of illustrative plates is in regularity distribution it is determined that described detection signal is local discharge signal in multiple phase places.
8. method as claimed in claim 7 is it is characterised in that methods described further includes：
The distance between mobile described device and described loop-network switch cabinet, as PRPD collection of illustrative plates and/or the PRPS of described detection signal
Figure on collection of illustrative plates is in dispersibility distribution it is determined that described detection signal is interference signal in multiple phase places.
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