CN104375067A - Partial discharge detection device and method of switchgear cubicle for loop network - Google Patents
Partial discharge detection device and method of switchgear cubicle for loop network Download PDFInfo
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Abstract
The invention provides a partial discharge detection device of a switchgear cubicle for a loop network. The partial discharge detection device comprises a sensor group, a multi-signal conditioning unit, a data acquisition unit, a data processing unit and a display unit. The sensor group comprises a transient earth voltage sensor, an ultrasonic sensor, an ultrahigh-frequency current sensor and/or a high-frequency current sensor and acquires a detection signal. The multi-signal conditioning unit conditions the detection signal into a pulse signal and acquires the peak value and the phase position of the pulse signal. The data acquisition unit converts the pulse signal into a digital signal. The data processing unit processes the digital signal, and an output amplitude value acquired by the transient earth voltage sensor or the ultrasonic sensor is detected to be displayed on the display unit; an output amplitude value, a phase position map, a PRPR map and/or a PRPS map acquired by the ultrahigh-frequency current sensor and/or the high-frequency current sensor are detected to be displayed on the display unit. By implementing the partial discharge detection device, a partial discharge signal can be differentiated accurately and quickly from the complex detection signal, so that detection errors are reduced, and working efficiency is improved.
Description
Technical field
The present invention relates to loop-network switch cabinet Partial Discharge Detecting Technology field, particularly relate to a kind of loop-network switch cabinet local discharge detection device and method.
Background technology
In electric system, loop networks switch cabinet equipment major part is arranged on open air, because running environment is severe, larger by external environment condition (temperature, humidity, filth) impact, double influence simultaneously by built-in electrical insulation and external environment will cause shelf depreciation, therefore needs the running status by effectively judging loop-network switch cabinet to the detection of shelf depreciation.
At present, the detection method for local discharge of loop networks switch cabinet equipment comprises transient earth voltage and detects and supersonic testing method, transient earth voltage detection method detects the electromagnetic signal in frequency 3MHz to the 100MHz scope of shelf depreciation generation, detects amplitude, umber of pulse, the order of severity of transient earth voltage; The centre frequency that supersonic testing method detects shelf depreciation generation is the ultrasonic signal of 40kHz, detects effective value, maximal value, frequency content, the original waveform of ultrasonic signal.The shortcoming of above-mentioned two kinds of detection methods is: the amplitude that can only detect detection signal, without the display of various relevant collection of illustrative plates, because detection signal comprises local discharge signal and undesired signal, therefore can only judge to there is abnormal signal, but cannot determine whether as local discharge signal.Therefore, need a kind of instrument badly and accurately and fast can detect local discharge signal on loop networks switch cabinet equipment.
Summary of the invention
Embodiment of the present invention technical matters to be solved is, a kind of loop-network switch cabinet local discharge detection device and method are provided, from the detection signal of complexity, accurately and fast can distinguish local discharge signal, reduce the error of detection, improve work efficiency.
In order to solve the problems of the technologies described above, embodiments provide a kind of loop-network switch cabinet local discharge detection device, comprise sensor group, multi signal conditioning unit, data acquisition unit, data processing unit and display unit; Wherein,
Described sensor group comprises transient earth voltage sensor, sonac, superfrequency sensor and/or High Frequency Current Sensor, each sensor in described sensor group is all connected with the input end of described multi signal conditioning unit, for obtaining the detection signal that loop-network switch cabinet produces;
The output terminal of described multi signal conditioning unit is connected with the input end of described data acquisition unit, for the described detection signal got is modulated into pulse signal, and obtains peak value and the phase place of described pulse signal;
The output terminal of described data acquisition unit is connected with the input end of described data processing unit, for converting described pulse signal to digital signal;
The output terminal of described data processing unit is connected with described display unit, after described digital signal is processed, when detecting that the detection signal that described digital signal is obtained by transient earth voltage sensor or sonac is changed, export the amplitude of described digital signal to described display unit display; Or
When detecting that the detection signal that described digital signal is obtained by superfrequency sensor or High Frequency Current Sensor is changed, export the amplitude of described digital signal, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates to described display unit display.
Wherein, described multi signal conditioning unit comprises a simulation detecting circuit, and described simulation detecting circuit comprises capacitance, biasing circuit, high frequency detector diode, integrating capacitor and load; Wherein,
The input end of described capacitance is connected with described sensor group, and output terminal is connected with the input end of described high frequency detector diode;
Described integrating capacitor and described load are also unified into a discharge loop, and one end ground connection of described discharge loop, the other end is connected with one end of described biasing circuit, the output terminal of described high frequency detector diode and the signal output part for exporting described detection signal respectively;
The other end of described biasing circuit is connected with a power supply.
Wherein, described device also comprises a radio frequency identification unit, and described radio frequency identification unit is connected with described data processing unit, for identifying the electronic tag on loop-network switch cabinet.
Wherein, the detection signal that described superfrequency sensor obtains is the electromagnetic signal in frequency 0.3GHz to 1.5GHz scope.
Wherein, the detection signal that described High Frequency Current Sensor obtains is the high-frequency pulse current signal in frequency 0.5 GHz to 50MHz scope.
Wherein, described device also comprises a wireless type power synchronization signal generator, is the signal source equal with its power frequency locking phase for adjusting described detection signal, and is sent to opposite end receiving equipment and carries out analyzing and processing.
The embodiment of the present invention additionally provides a kind of loop-network switch cabinet detection method for local discharge, it is characterized in that, it realizes in aforesaid device, and described method comprises:
The test value of the detection signal that loop-network switch cabinet produces is obtained by the transient earth voltage sensor in described device;
Judge whether the test value of the detection signal of described acquisition is greater than default threshold value;
If so, then obtain further by the superfrequency sensor in described device the amplitude of detection signal, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or the PRPS collection of illustrative plates that described loop-network switch cabinet produces;
Distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in regularity distribution, then determine that described detection signal is local discharge signal.
Wherein, described method comprises further:
Distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in dispersed distribution, then determine that described detection signal is undesired signal.
The embodiment of the present invention further provides a kind of loop-network switch cabinet detection method for local discharge, it is characterized in that, it realizes in aforesaid device, and described method comprises:
The test value of the detection signal that loop-network switch cabinet produces is obtained by the transient earth voltage sensor in described device;
Judge whether the test value of the detection signal of described acquisition is greater than default threshold value;
If so, then combine further by the sonac in described device and High Frequency Current Sensor, obtain the amplitude of the detection signal that described loop-network switch cabinet produces, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates;
Distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in regularity distribution, then determine that described detection signal is local discharge signal.
Wherein, described method comprises further:
Distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in dispersed distribution, then determine that described detection signal is undesired signal.
Implement the embodiment of the present invention, there is following beneficial effect:
In embodiments of the present invention, due to the detection signal adopting sensor group to gather loop-network switch cabinet generation in device, when adopting transient earth voltage and the uncertain detection signal of supersonic testing method to be local discharge signal, the phase place collection of illustrative plates of the detection signal that loop-network switch cabinet produces can be obtained further by superfrequency sensor or High Frequency Current Sensor, PRPD(Phase Resolved Peak Display, local phase feature) collection of illustrative plates and/or PRPS(Phase Resolved Pulse Sequence, nervuration phase characteristic) collection of illustrative plates determines the type of detection signal, therefore, it is possible to accurately and fast distinguish local discharge signal from the detection signal of complexity, reduce the error of detection, improve work efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, the accompanying drawing obtaining other according to these accompanying drawings still belongs to category of the present invention.
The structural representation of a kind 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;
The process flow diagram of a kind of loop-network switch cabinet detection method for local discharge that Fig. 4 provides for the embodiment of the present invention two;
The process flow diagram of a kind of loop-network switch cabinet detection method for local discharge that Fig. 5 provides for the embodiment of the present invention three.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, be a kind of loop-network switch cabinet local discharge detection device that the embodiment of the present invention one provides, comprise sensor group 1, multi signal conditioning unit 2, data acquisition unit 3, data processing unit 4 and display unit 5; Wherein,
Sensor group 1 comprises transient earth voltage sensor 11, sonac 12, superfrequency sensor 13 and/or High Frequency Current Sensor 14, each sensor in sensor group 1 is all connected with the input end of multi signal conditioning unit 2, for obtaining the detection signal that loop-network switch cabinet (not shown) produces;
The output terminal of multi signal conditioning unit 2 is connected with the input end of data acquisition unit 3, for the detection signal got is modulated into pulse signal, and obtains peak value and the phase place of pulse signal;
The output terminal of data acquisition unit 3 is connected with the input end of data processing unit 4, for converting pulse signal to digital signal;
The output terminal of data processing unit 4 is connected with display unit 5, after digital signal is processed, when detecting that the detection signal that this digital signal is obtained by transient earth voltage sensor 11 or sonac 12 is changed, the amplitude of output digit signals shows to display unit 5; Or
When the detection signal conversion that digital signal obtains by superfrequency sensor 13 or High Frequency Current Sensor 14 being detected, 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.
Should be noted that, sensor can one or morely combinationally use, combinationally using in process, the test value of detection signal is all first obtained first by transient earth voltage sensor 11, again by superfrequency sensor 13 mode or more successively by mode that sonac 12 combines with High Frequency Current Sensor 14, acquisition detection signal turns amplitude, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates after digital signal, thus determines size and the type of detection signal.
The mode that in sensor group 1, sensor detects loop-network switch cabinet shelf depreciation is as follows:
(1) transient earth voltage sensor 11 pairs of loop-network switch cabinet shelf depreciations are used to detect.In testing process, transient earth voltage sensor 11 is contacted with loop-network switch cabinet, guarantee transient earth voltage sensor 11 and switch cubicle metal decking close contact in testing process, and should try one's best on the metal decking of the easy leakage position of the Partial discharge signal such as view window, ventilating blind.If there is detecting the larger situation of numerical value, suggestion measurement more than three times, to determine test result, is judged local discharge magnitude by amplitude, umber of pulse etc.
(2) sonac 12 pairs of loop-network switch cabinet shelf depreciations are used to detect.Sonac 12 (should not should be close to close to device outer surface gap, to ensure that sonac 12 and equipment room have air duct), in test process, sonac 12 stationary state should be kept, avoid because sonac 12 effect of jitter test result; In testing process ultrasonic sensor 12 should and equipment high pressure place between must retain enough safe distances.Judge shelf depreciation size and type by amplitude, frequency content, collection of illustrative plates etc., adjustable enlargement factor detects if desired.
(3) superfrequency sensor 13 pairs of loop-network switch cabinet shelf depreciations are used to detect.Superfrequency sensor 13 should be attached to that equipment surface nonmetallic materials are outside, and the detection signal of acquisition is the electromagnetic signal in frequency 0.3GHz to 1.5GHz scope, in testing process superfrequency sensor 13 should and equipment high pressure place between must retain enough safe distances.Judge shelf depreciation size and type by amplitude, collection of illustrative plates etc., adjustable detection bandwidth, gain etc. if desired detect.
(4) high frequency sensors 14 pairs of loop-network switch cabinet shelf depreciations are used to detect.High frequency sensors 14 should be stuck on external cable body or ground wire and test, the detection signal obtained is high-frequency pulse current signal in frequency 0.5 GHz to 50MHz scope, testing process medium-high frequency sensor 14 should and equipment high pressure place between must retain enough safe distances.Judge shelf depreciation size and type by amplitude, collection of illustrative plates etc., adjustable gain etc. detect if desired.
For the signal characteristic of dissimilar sensor, corresponding signal condition and Acquisition Circuit need be designed respectively.Signal frequency due to sensor is general higher, and is confined to the capacity of data acquisition and storage medium, to the original waveform of observation signal always, is then difficult to the requirement taking into account high sampling and store data volume.In order to the continuous detecting of many power frequency periods can be realized, 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 of general digital acquisition system to collection signal, as shown in Figure 2, therefore multi signal conditioning unit 2 comprises a simulation detecting circuit, and simulation detecting circuit comprises capacitance 21, biasing circuit 22, high frequency detector diode 23, integrating capacitor 24 and load 25; Wherein,
The input end of capacitance 21 is connected with sensor group 1, and output terminal is connected with the input end of high frequency detector diode 23;
Integrating capacitor 24 is with load 25 and be unified into a discharge loop, and one end ground connection of discharge loop, and the other end is respectively with one end of biasing circuit 22, the output terminal of high frequency detector diode 23 and be connected for the signal output part of output detections signal;
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 scenarios of multi signal conditioning unit 2 in the embodiment of the present invention is further illustrated:
In figure, C1 is capacitance, and C2 is integrating capacitor, and C3 keeps for signal peak, and R1 is the resistance in biasing circuit, and R2 is load, forms discharge loop with integrating capacitor C2, and D1 is high frequency detector diode, and D2 is voltage stabilizing diode, and Vcc is power end;
High frequency Partial discharge signal excludes DC level through capacitance C1 coupling, by high frequency detector diode D1, by integrating capacitor C2, Integral Processing is carried out to electric current, thus obtain the output of peak value maintenance detection signal by electric capacity C3, widened effective time delay of this detection signal.Current integration point provides bias voltage by the resistance R1 of power Vcc in biasing circuit, forms discharge loop at integrating capacitor two ends C2 parallel resistance R2, and the time constant that peak value keeps is obtained by integrating capacitor C2 and resistance R2 coupling.
For the ease of asset management, therefore device also comprises a radio frequency identification unit 6, and radio frequency identification unit 6 is connected with data processing unit 4, for identifying the electronic tag on loop-network switch cabinet.
In order to treatment and analysis can be carried out to detection signal further, therefore device also comprises a wireless type power synchronization signal generator, be the signal source equal with its power frequency locking phase for adjusting detection signal, and be sent to opposite end receiving equipment and carry out analyzing and processing.
It should be noted that this wireless type power synchronization signal generator after sensor group 1 obtains detection signal, should be connected with the sensor group 1 in device, multi signal conditioning unit 2, data acquisition unit 3 and data processing unit 4 are wherein arbitrary.
As shown in Figure 4, be a kind of loop-network switch cabinet detection method for local discharge that the embodiment of the present invention two provides, it realizes in aforesaid device, and described method comprises:
Step S101, obtained the test value of the detection signal that loop-network switch cabinet produces by transient earth voltage sensor in described device;
Be specially, transient earth voltage sensor is contacted with loop-network switch cabinet, transient earth voltage sensor and switch cubicle metal decking close contact is guaranteed in testing process, and should try one's best on the metal decking of the easy leakage position of the local discharge signal such as view window, ventilating blind, thus obtain the test value of the detection signal that loop-network switch cabinet produces.
It should be noted that the data that the loop-network switch cabinet that loop networks switch testing result cashier's office in a shop should be of the same type with other detects compare, or compare with the detection data before loop-network switch cabinet itself.If the data detected are larger than other same model loop-network switch cabinet, or larger than former result, just illustrate that this loop-network switch cabinet exists discharge activities, and then the possibility of infer fault.
Step S102, judge whether the test value of the detection signal of described acquisition is greater than default threshold value; If so, then step S103 is performed; If not, then terminate;
Be specially, judge whether the test value of detection signal is greater than default threshold value, as an example, during test value <10DB, loop-network switch cabinet non-fault; During 10DB≤test value <20DB, pay close attention to and shorten sense cycle; During test value >=20DB, need to adopt superfrequency sensor to detect.
Step S103, the amplitude obtaining the detection signal that described loop-network switch cabinet produces further by the superfrequency sensor in described device, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates;
Be specially, usually when carrying out superfrequency sensor and carrying out local discharge signal measurement to loop-network switch cabinet, following several typical local discharge signal may be there is: corona discharge, cavity discharge, the electric discharge of free metal particle and floating potential discharge etc.Be below the explanation of several mode of local discharge signal, specific as follows:
A, corona discharge: clearly, usually in negative half period or the positive half cycle appearance of operating frequency phase, discharge signal intensity is more weak and PHASE DISTRIBUTION is wider, and discharge time is more for the polar effect of discharge signal.But another half cycle also may occur discharge signal under high voltage grade, amplitude is higher and PHASE DISTRIBUTION is narrower, and discharge time is less;
B, floating potential discharge: discharge signal all there will be at the positive and negative half cycle of operating frequency phase usually, and has certain symmetry, discharge signal amplitude is very large and neighbouring discharge signal interval is basically identical, and discharge time is few, and electric discharge repetition rate is lower; Wherein, PRPS collection of illustrative plates has " the interior Eight characters " or " the outer Eight characters " distribution characteristics;
C, free metal particle discharge: discharge signal polar effect is not obvious, and arbitrary phase all has distribution, and discharge time is few, and discharge signal amplitude is without evident regularity, and the discharge signal time interval is unstable.Improve electric pressure discharge signal amplitude to increase but inter-spike intervals reduction.(note: when test to when having particle to discharge, can assisting ultrasonic method carry out detecting and confirming);
D, cavity discharge: discharge signal all there will be at the positive and negative half cycle of operating frequency phase usually, and has certain symmetry, and discharge signal amplitude is comparatively disperseed, and discharge time is less.
Step S104, distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in regularity distribution, then determine that described detection signal is local discharge signal.
Be specially, in distance process between mobile device and loop-network switch cabinet, should guarantee that the superfrequency sensor in device can get the detection signal of loop-network switch cabinet generation always, when discovery is in moving process, the distribution that 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 in multiple phase place, then detection signal is local discharge signal.
Be local discharge signal relative to distinguishing detection signal, can also distinguish detection signal is undesired signal, and described method comprises further:
Step S105, distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in dispersed distribution, then determine that described detection signal is undesired signal.
As shown in Figure 5, be a kind of loop-network switch cabinet detection method for local discharge that the embodiment of the present invention three provides, it realizes in aforesaid device, and described method comprises:
Step S201, obtained the test value of the detection signal that loop-network switch cabinet produces by transient earth voltage sensor in described device;
Be specially, transient earth voltage sensor is contacted with loop-network switch cabinet, transient earth voltage sensor and switch cubicle metal decking close contact is guaranteed in testing process, and should try one's best on the metal decking of the easy leakage position of the local discharge signal such as view window, ventilating blind, thus obtain the test value of the detection signal that loop-network switch cabinet produces.
It should be noted that the data that the loop-network switch cabinet that loop networks switch testing result cashier's office in a shop should be of the same type with other detects compare, or compare with the detection data before loop-network switch cabinet itself.If the data detected are larger than other same model loop-network switch cabinet, or larger than former result, just illustrate that this loop-network switch cabinet exists discharge activities, and then the possibility of infer fault.
Step S202, judge whether the test value of the detection signal of described acquisition is greater than default threshold value; If so, then step S203 is performed; If not, then terminate;
Be specially, judge whether the test value of detection signal is greater than default threshold value, as an example, during test value <10DB, loop-network switch cabinet non-fault; During 10DB≤test value <20DB, pay close attention to and shorten sense cycle; During test value >=20DB, need to adopt sonac and High Frequency Current Sensor to combine to detect.
Step S203, to combine further by the sonac in described device and High Frequency Current Sensor, obtain the amplitude of the detection signal that described loop-network switch cabinet produces, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates;
Be specially, usually carry out sonac and High Frequency Current Sensor combine to loop-network switch cabinet carry out local discharge signal measure time, following several typical local discharge signal may be there is: corona discharge, cavity discharge, the electric discharge of free metal particle and floating potential discharge etc.
Carrying out in Ultrasonic Detection process, notice that the ultrasonic signal that real shelf depreciation produces can hear the sound (sound of whistling) discharging and break from earphone, during record, the maximal value that in this test, ultrasound wave is stable should be recorded.And according to the signal such as sound, amplitude, characteristic spectrum detected, what judge local discharge signal has the type that it's too late discharges.Adopt supersonic testing method to there is the defect of local discharge signal collection of illustrative plates, concrete defect is as follows:
(I) suspended discharge: under amplitude detection pattern, its signal effective value, cycle peak are comparatively large, there is an obvious overtones band composition and doubled frequency composition, and doubled frequency composition are greater than an overtones band composition; Under phase detection mode, its signal has obvious phase place buildup effect, in a power frequency period, show as two bunches, namely has " bimodal " feature; Under wave test pattern, its signal shows as the pulse signal of rule, occurs two bunches, two bunches of sizableness in a power frequency period.
(II) corona defect: under amplitude detection pattern, its signal effective value, cycle peak are comparatively large, there is an obvious overtones band composition and doubled frequency composition, and an overtones band composition are greater than doubled frequency composition; Under phase detection mode, its signal has obvious phase place buildup effect, in a power frequency period, show as cluster, namely has " unimodal " feature; Under wave test pattern, its signal shows as the pulse signal of rule, occurs that cluster large-signal or cluster amplitude are obviously comparatively large, two bunches of signals that cluster is obviously less in a power frequency period.
(III) free metal particle defects: under amplitude detection pattern, its signal effective value, cycle peak are comparatively large, but 50Hz frequency content and 100Hz frequency content not obvious; Under phase detection mode, its signal does not have obvious phase place buildup effect, similarly in a power frequency period is uniformly distributed; Under wave test pattern, its signal has obvious high impulse, but the relevance of this pulse signal and power-frequency voltage is little, and it occurs having certain randomness; Under pulse detection pattern, its signal list reveals significantly " triangle hump " shape.
In order to make up the defect adopting supersonic testing method to there is local discharge signal collection of illustrative plates, therefore need to match with high-frequency current detection method, the local discharge signal adopting High Frequency Current Sensor to get above-mentioned several mode is with to adopt accessed by superfrequency sensor in the embodiment of the present invention two identical, detail refers in the embodiment of the present invention two explanation adopting superfrequency sensor to get above-mentioned several mode local discharge signal, and this is no longer going to repeat them.
Step S204, distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in regularity distribution, then determine that described detection signal is local discharge signal.
Be specially, in distance process between mobile device and loop-network switch cabinet, the detection signal that sonac in device or High Frequency Current Sensor can get loop-network switch cabinet all always and produce should be guaranteed, when discovery is in moving process, the distribution that 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 in multiple phase place, then detection signal is local discharge signal.
Be local discharge signal relative to distinguishing detection signal, can also distinguish detection signal is undesired signal, and therefore described method comprises further:
Step S205, distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in dispersed distribution, then determine that described detection signal is undesired signal.
Implement the embodiment of the present invention, there is following beneficial effect:
In embodiments of the present invention, due to the detection signal adopting sensor group to gather loop-network switch cabinet generation in device, when adopting transient earth voltage and the uncertain detection signal of supersonic testing method to be local discharge signal, the type that detection signal determined by the phase place collection of illustrative plates of the detection signal that loop-network switch cabinet produces, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates can be obtained further by superfrequency sensor or High Frequency Current Sensor, therefore, it is possible to accurately and fast distinguish local discharge signal from the detection signal of complexity, reduce the error of detection, improve work efficiency.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, described program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk, CD etc.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. a loop-network switch cabinet local discharge detection device, is characterized in that, comprises sensor group, multi signal conditioning unit, data acquisition unit, data processing unit and display unit; Wherein,
Described sensor group comprises transient earth voltage sensor, sonac, superfrequency sensor and/or High Frequency Current Sensor, each sensor in described sensor group is all connected with the input end of described multi signal conditioning unit, for obtaining the detection signal that loop-network switch cabinet produces;
The output terminal of described multi signal conditioning unit is connected with the input end of described data acquisition unit, for the described detection signal got is modulated into pulse signal, and obtains peak value and the phase place of described pulse signal;
The output terminal of described data acquisition unit is connected with the input end of described data processing unit, for converting described pulse signal to digital signal;
The output terminal of described data processing unit is connected with described display unit, after described digital signal is processed, when detecting that the detection signal that described digital signal is obtained by transient earth voltage sensor or sonac is changed, export the amplitude of described digital signal to described display unit display; Or
When detecting that the detection signal that described digital signal is obtained by superfrequency sensor or High Frequency Current Sensor is changed, export the amplitude of described digital signal, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates to described display unit display.
2. device as claimed in claim 1, it is characterized in that, described multi signal conditioning unit comprises a simulation detecting circuit, and described simulation detecting circuit comprises capacitance, biasing circuit, high frequency detector diode, integrating capacitor and load; Wherein,
The input end of described capacitance is connected with described sensor group, and output terminal is connected with the input end of described high frequency detector diode;
Described integrating capacitor and described load are also unified into a discharge loop, and one end ground connection of described discharge loop, the other end is connected with one end of described biasing circuit, the output terminal of described high frequency detector diode and the signal output part for exporting described detection signal respectively;
The other end of described biasing circuit is connected with a power supply.
3. device as claimed in claim 2, it is characterized in that, described device also comprises a radio frequency identification unit, and described radio frequency identification unit is connected with described data processing unit, for identifying the electronic tag on loop-network switch cabinet.
4. device as claimed in claim 1, is characterized in that, the detection signal that described superfrequency sensor obtains is the electromagnetic signal in frequency 0.3GHz to 1.5GHz scope.
5. device as claimed in claim 1, is characterized in that, the detection signal that described High Frequency Current Sensor obtains is the high-frequency pulse current signal in frequency 0.5 GHz to 50MHz scope.
6. the device according to any one of claim 1 to 5, it is characterized in that, described device also comprises a wireless type power synchronization signal generator, is the signal source equal with its power frequency locking phase for adjusting described detection signal, and is sent to opposite end receiving equipment and carries out analyzing and processing.
7. a loop-network switch cabinet detection method for local discharge, is characterized in that, it realizes in the device such as according to any one of claim 1 to 6, and described method comprises:
The test value of the detection signal that loop-network switch cabinet produces is obtained by the transient earth voltage sensor in described device;
Judge whether the test value of the detection signal of described acquisition is greater than default threshold value;
If so, then obtain further by the superfrequency sensor in described device the amplitude of detection signal, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or the PRPS collection of illustrative plates that described loop-network switch cabinet produces;
Distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in regularity distribution, then determine that described detection signal is local discharge signal.
8. method as claimed in claim 7, it is characterized in that, described method comprises further:
Distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in dispersed distribution, then determine that described detection signal is undesired signal.
9. a loop-network switch cabinet detection method for local discharge, is characterized in that, it realizes in the device such as according to any one of claim 1 to 6, and described method comprises:
The test value of the detection signal that loop-network switch cabinet produces is obtained by the transient earth voltage sensor in described device;
Judge whether the test value of the detection signal of described acquisition is greater than default threshold value;
If so, then combine further by the sonac in described device and High Frequency Current Sensor, obtain the amplitude of the detection signal that described loop-network switch cabinet produces, phase place collection of illustrative plates, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates;
Distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in regularity distribution, then determine that described detection signal is local discharge signal.
10. method as claimed in claim 9, it is characterized in that, described method comprises further:
Distance between mobile described device and described loop-network switch cabinet, when the figure on the phase place collection of illustrative plates of described detection signal, PRPD collection of illustrative plates and/or PRPS collection of illustrative plates in multiple phase place in dispersed distribution, then determine that described detection signal is undesired signal.
Priority Applications (1)
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| CN106841836A (en) * | 2015-12-07 | 2017-06-13 | 国网甘肃省电力公司检修公司 | A kind of method and device that multi-functional detection is carried out to converting equipment running status |
| CN107918092A (en) * | 2017-12-12 | 2018-04-17 | 北京交通大学 | A kind of temporary electric discharge quantity measuring method of partial discharge of switchgear |
| CN109031069A (en) * | 2018-08-16 | 2018-12-18 | 国网山西省电力公司临汾供电公司 | The diagnostic system of high-tension switch cabinet Partial discharge signal |
| CN109917247A (en) * | 2019-03-28 | 2019-06-21 | 珠海市伊特高科技有限公司 | A kind of GIS ultrahigh frequency local discharge on-line monitoring device and method using accumulative PRPD technology |
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| CN110470960A (en) * | 2019-09-05 | 2019-11-19 | 国网北京市电力公司 | The analysis method and device of cable local discharge, storage medium and processor |
| CN110687404A (en) * | 2019-08-27 | 2020-01-14 | 西安电子科技大学 | Portable partial discharge detection equipment |
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| CN109031069A (en) * | 2018-08-16 | 2018-12-18 | 国网山西省电力公司临汾供电公司 | The diagnostic system of high-tension switch cabinet Partial discharge signal |
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| CN110389284A (en) * | 2019-08-12 | 2019-10-29 | 平顶山学院 | The detection system and detection method discharged with equipment fault on net post |
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| CN110687404B (en) * | 2019-08-27 | 2021-11-05 | 西安电子科技大学 | Portable partial discharge detection equipment |
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| CN110470960A (en) * | 2019-09-05 | 2019-11-19 | 国网北京市电力公司 | The analysis method and device of cable local discharge, storage medium and processor |
| CN110888009A (en) * | 2019-11-28 | 2020-03-17 | 四川泛华航空仪表电器有限公司 | Device and method for monitoring integrity of wire harness shielding layer |
| CN111426893A (en) * | 2020-03-17 | 2020-07-17 | 海盐南原电力工程有限责任公司 | Portable high-voltage equipment fault sound inspection device and fault detection method thereof |
| CN111751683A (en) * | 2020-07-03 | 2020-10-09 | 国网河南省电力公司检修公司 | GIS equipment partial discharge detection method |
| CN112731079A (en) * | 2020-12-24 | 2021-04-30 | 国网电力科学研究院武汉南瑞有限责任公司 | Partial discharge detection device for rapid development type fault of ultra-high voltage transformer |
| CN113406445A (en) * | 2021-03-24 | 2021-09-17 | 上海朋禾智能科技有限公司 | Transformer partial discharge multidimensional data online detection method |
| CN113156284A (en) * | 2021-04-28 | 2021-07-23 | 西安西电开关电气有限公司 | Method and device for processing interference signals of GIS equipment switching action |
| CN113406453A (en) * | 2021-06-30 | 2021-09-17 | 平顶山学院 | MCU-based PRPD/PRPS map data processing method and detection device |
| CN115116308A (en) * | 2022-06-15 | 2022-09-27 | 华南理工大学 | Partial discharge detection teaching system and method suitable for laboratory |
| CN115542101A (en) * | 2022-11-30 | 2022-12-30 | 杭州兆华电子股份有限公司 | Voiceprint preprocessing method of transformer voiceprint detection system |
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