CN101750573A - Portable cable local discharge detection device - Google Patents
Portable cable local discharge detection device Download PDFInfo
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- CN101750573A CN101750573A CN200910310991A CN200910310991A CN101750573A CN 101750573 A CN101750573 A CN 101750573A CN 200910310991 A CN200910310991 A CN 200910310991A CN 200910310991 A CN200910310991 A CN 200910310991A CN 101750573 A CN101750573 A CN 101750573A
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Abstract
The invention relates to a portable cable local discharge detection device in the technical field of electric power detection. The portable cable local discharge detection device comprises a sensor, a detection terminal and a control module, wherein the input end of the sensor is connected with an electric cable for detection, the output end of the sensor is connected with the detection terminal for transmitting an analog sensing signal, and the control module is connected with the detection terminal for receiving the analog sensing signal and outputting a control instruction and a detection result. The invention has compact structure, convenient mobile detection because a box body is provided with a wheel structure, high working efficiency, higher sensitivity and signal to noise ratio, and can be applied to effectively detecting local discharge of a cross linked polyethylene (XLPE) cable on site by comprehensively applying four detection methods of a high-frequency current method, an ultrahigh frequency method, an ultrasonic method and an infrared temperature method.
Description
Technical field
What the present invention relates to is the device in a kind of electric power detection technique field, specifically is a kind of portable cable local discharge detection device based on crosslinked polyethylene (XPLE).
Background technology
Crosslinked polyethylene (XLPE) power cable is installed and laid conveniently because its electric property and heat resistance are good, is not subjected to the restriction of height fall, does not particularly have leakage of oil and causes the danger of fire, and is increasingly extensive in the application of urban distribution network.But power cable usually takes place to wear out under electricity, heat, mechanical external force, water, oil, organic compound, acid, alkali, salt and microbial action, has influence on insulating property, and shelf depreciation takes place; In the cable operational process,, also can produce shelf depreciation because internal field's stress that the factors such as accumulation of space charge cause under the inner impurity, semiconductor protrusion, voltage effect is concentrated; Cable termination is owing to the insulation system complexity, and the factor that influences its insulating property is a lot, and normally on-the-spot manual manufacture, the bad potential faults of leaving over easily of technology, and the cable termination failure rate is affected the safe operation of cable far above cable body.Along with the little expansion in city with go into carrying out of ground engineering, increasing XLPE cable is put in the electric power transfer of each electric pressure of electric system.But traditional cycle of prophylactic tria routinely is long, can not find cable fault effectively in time, the needs of safety in production have not been satisfied, along with putting into operation of increasing power cable, a lot of units can't finish conventional prophylactic tria according to rules on time, therefore how accurately the insulation status that detects on-the-spot operation cable, fast, has economically become urgent problem, to improving the power system power supply reliability, reduces the economic loss that cable fault causes and is of great importance.
Find through retrieval prior art, the portable detecting device that detects shelf depreciation in live electric cable or the equipment is with the narrow radio frequency detecting device detection streamer of different electromagnetic probes or the local discharge signal in the equipment, makes the portable detecting device that local discharge signal shows with the volume indicator electrometer, but the prior art only adopts single electrical measuring method (radio frequency) to detect shelf depreciation, show the local discharge signal size with the volume indicator electrometer, loudspeaker is simulated sounding to local discharge signal, and testing process relies on operating personnel's experience and the difficult judgement of validity as a result.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of portable cable local discharge detection device is provided, integrated application 4 kinds of detection methods such as high-frequency current method, ultrahigh frequency method, ultrasonic method, infrared temperature method, promptly the electricity, sound, the temperature method combination, user interface close friend, intuitively, easy to operate, and have necessarily intelligent, compact conformation, have higher sensitivity and signal to noise ratio (S/N ratio), can effectively detect the XLPE cable shelf depreciation.
The present invention is achieved by the following technical solutions, the present invention includes: sensor, sense terminals and control module, wherein: the input end of sensor is connected with power cable and detects, the output terminal of sensor is connected with sense terminals with the transportation simulator transducing signal, and control module is connected with sense terminals to receive the analog sensed signal and to export steering order and testing result.
Described analog sensed signal comprises: high-frequency current signal, ultra-high frequency signal, ultrasonic signal and infrared temperature signal;
Described sensor comprises: High Frequency Current Sensor, uhf sensor, sonac and infrared temperature sensor, wherein: High Frequency Current Sensor, uhf sensor, sonac and infrared temperature sensor are connected with the transportation simulator transducing signal with sense terminals respectively.
Described sense terminals comprises: signal condition unit and data acquisition unit, wherein: the signal condition unit is connected with sensor to receive the analog sensed signal, the output terminal of signal condition unit is connected with data acquisition unit with output analog sensed signal, the output terminal of signal condition unit is connected with control module with output infrared temperature signal, the data acquisition unit output steering order that is connected with the signal condition unit, data acquisition unit are connected with control module with selectivity output high-frequency current signal, a kind of or its combination in ultra-high frequency signal or the ultrasonic signal also receives steering order.
Described control module comprises: office's discharge signal processing unit, feature extraction unit and analyzing and diagnosing unit are put in office, wherein: office's discharge signal processing unit is connected with sense terminals to receive the analog sensed signal, office's discharge signal processing unit adopts FIR filtering, FFT filtering or wavelet filtering send detection signal to office after with the noise filtering in the analog sensed signal and put feature extraction unit, office puts feature extraction unit and exports characteristic spectrum in the detection signal and discharge to the analyzing and diagnosing unit after the fingerprint extraction, and the analyzing and diagnosing unit is to characteristic spectrum and discharge fingerprint analysis assessment and output testing result.
Described characteristic spectrum comprises: amplitude PHASE DISTRIBUTION, average discharge capacity PHASE DISTRIBUTION, discharge time PHASE DISTRIBUTION, discharge amplitude distribution, discharge energy distribution and the three-dimensional collection of illustrative plates of φ-q-n.
Described discharge fingerprint comprises: standout, measure of skewness, local peaks number, discharge degree of asymmetry, phase place degree of asymmetry, the simple crosscorrelation factor and phase place intermediate value etc.
The corresponding signal condition unit of High Frequency Current Sensor of the present invention (HFCT) has 10 times and 100 times of two-stages amplifications, and frequency band is 300KHz-25MHz, can utilize software to adjust enlargement factor easily according to the size of spot sampling signal; The signal condition unit that uhf sensor (UHF) is corresponding mainly is made up of bandpass filter, prime amplifier, frequency mixer, frequency synthesizer etc., the signal that is used for sensor is sent here carries out pre-service, realizes the signal of a certain centre frequency of the certain bandwidth of any gating hyper band; The signal condition unit that sonac (AE) is corresponding is the voltage-type amplifilter, 1000 times of enlargement factors, frequency band 20kHz-1200kHz; The signal condition unit that infrared temperature sensor (IR) is corresponding is the discernible digital signal of industrial computer with the infrared probe conversion of signals, is connected with portable industrial computer by the RS232 interface.The highest sample frequency 100MHz of acquisition module, AD resolution 16bit, AC coupling input mode.The XLPE cable Partial Discharge Detection software systems of portable industrial computer installation and design.
High Frequency Current Sensor, uhf sensor, signal processing unit corresponding in sonac and infrared temperature sensor and the sense terminals is connected, data acquisition unit is connected with the signal condition unit to receive image data, and image data preserved and exports to an innings discharge signal processing unit, office's discharge signal processing unit adopts FIR filtering, FFT filtering or wavelet filtering send detection signal to office after with the noise filtering in the image data and put feature extraction unit, office puts feature extraction unit and exports characteristic spectrum in the detection signal and discharge to the analyzing and diagnosing unit after the fingerprint extraction, and the analyzing and diagnosing unit is to characteristic spectrum and discharge fingerprint analysis assessment and output testing result.
Compact conformation of the present invention, casing has wheeled construction, move easy to detect, high efficiency, have higher sensitivity and signal to noise ratio (S/N ratio), 4 kinds of detection methods such as integrated application high-frequency current method, ultrahigh frequency method, ultrasonic method, infrared temperature method can effectively detect the XLPE cable shelf depreciation at the scene.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a workflow synoptic diagram of the present invention.
Fig. 3 is the on-the-spot synoptic diagram that detects of pick-up unit.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: sensor, sense terminals and control module, wherein: the input end of sensor is connected with power cable and detects, the output terminal of sensor is connected with sense terminals with the transportation simulator transducing signal, and control module is connected with sense terminals to receive the analog sensed signal and to export steering order and testing result.
Described analog sensed signal comprises: high-frequency current signal, ultra-high frequency signal, ultrasonic signal and infrared temperature signal;
Described steering order comprises: feature extraction instruction and analyzing and diagnosing instruction are put in enlargement factor regulating command, sampling start and stop instruction, sampling pattern selection instruction, signal Processing instruction, office;
Described testing result comprises: maximum pd quantity PHASE DISTRIBUTION index, average discharge capacity PHASE DISTRIBUTION index, discharge time PHASE DISTRIBUTION index, discharge amplitude distribution index and discharge energy distribution index;
Described sensor comprises: High Frequency Current Sensor, uhf sensor, sonac and infrared temperature sensor, wherein: High Frequency Current Sensor, uhf sensor, sonac and infrared temperature sensor are connected with the transportation simulator transducing signal with sense terminals respectively.
Described High Frequency Current Sensor adopts clamp type structure, and the electromagnetic coupled magnetic core of this High Frequency Current Sensor adopts the ultracrystallite material, and magnetic core has air gap, avoids occurring the magnetic core saturated phenomenon, is used for the pulsed current signal that generation is put in induction office;
It is the microstrip antenna of 500MHz-1.5GHz that described uhf sensor adopts frequency band, the ultra-high frequency signal that produces when being used to receive cable office and putting;
Described sonac is the piezo-electric type calibrate AE sensor, and resonance frequency is 30kHz, and frequency band is 20kHz-180kHz;
Described infrared temperature sensor is contactless infrared temperature sensor, exactly the energy of measuring radiation and convert it into temperature signal.
Described sense terminals comprises: signal condition unit and data acquisition unit, wherein: the signal condition unit is connected with sensor to receive the analog sensed signal, the output terminal of signal condition unit is connected with data acquisition unit with output analog sensed signal, the output terminal of signal condition unit is connected with control module with output infrared temperature signal, the data acquisition unit output steering order that is connected with the signal condition unit, data acquisition unit are connected with control module with selectivity output high-frequency current signal, a kind of or its combination in ultra-high frequency signal or the ultrasonic signal also receives steering order.
Described sense terminals is provided with 3 machine two-way switches, realizes the manual switchover of manual steering order.
Described control module comprises: office's discharge signal processing unit, feature extraction unit and analyzing and diagnosing unit are put in office, wherein: office's discharge signal processing unit is connected with sense terminals to receive the analog sensed signal, office's discharge signal processing unit adopts FIR filtering, FFT filtering or wavelet filtering send detection signal to office after with the noise filtering in the analog sensed signal and put feature extraction unit, office puts feature extraction unit and exports characteristic spectrum in the detection signal and discharge to the analyzing and diagnosing unit after the fingerprint extraction, and the analyzing and diagnosing unit is to characteristic spectrum and discharge fingerprint analysis assessment and output testing result.
Described characteristic spectrum comprises: amplitude PHASE DISTRIBUTION, average discharge capacity PHASE DISTRIBUTION, discharge time PHASE DISTRIBUTION, discharge amplitude distribution, discharge energy distribution and the three-dimensional collection of illustrative plates of φ-q-n.
Described discharge fingerprint comprises: standout, measure of skewness, local peaks number, discharge degree of asymmetry, phase place degree of asymmetry, the simple crosscorrelation factor and phase place intermediate value etc.
As shown in Figure 2, present embodiment carries out work in the following manner: High Frequency Current Sensor, uhf sensor, signal processing unit corresponding in sonac and infrared temperature sensor and the sense terminals is connected, data acquisition unit is connected with the signal condition unit to receive image data, and image data preserved and exports to an innings discharge signal processing unit, office's discharge signal processing unit adopts FIR filtering, FFT filtering or wavelet filtering send detection signal to office after with the noise filtering in the image data and put feature extraction unit, office puts feature extraction unit and exports characteristic spectrum in the detection signal and discharge to the analyzing and diagnosing unit after the fingerprint extraction, and the analyzing and diagnosing unit is to characteristic spectrum and discharge fingerprint analysis assessment and output testing result.
As shown in Figure 3, be the concrete scheme of installation of present embodiment, wherein: High Frequency Current Sensor, uhf sensor, sonac and infrared temperature sensor are arranged at respectively on the cable shield of high frequency cable, High Frequency Current Sensor is connected with the cable shield ground wire of high frequency cable, and high frequency cable is connected with switch cubicle.
Claims (9)
1. portable cable local discharge detection device, it is characterized in that, comprise: sensor, sense terminals and control module, wherein: the input end of sensor is connected with power cable and detects, the output terminal of sensor is connected with sense terminals with the transportation simulator transducing signal, and control module is connected with sense terminals to receive the analog sensed signal and to export steering order and testing result;
Described analog sensed signal comprises: high-frequency current signal, ultra-high frequency signal, ultrasonic signal and infrared temperature signal.
2. portable cable local discharge detection device according to claim 1, it is characterized in that, described sensor comprises: High Frequency Current Sensor, uhf sensor, sonac and infrared temperature sensor, wherein: High Frequency Current Sensor, uhf sensor, sonac and infrared temperature sensor are connected with the transportation simulator transducing signal with sense terminals respectively.
3. portable cable local discharge detection device according to claim 2 is characterized in that, described High Frequency Current Sensor adopts clamp type structure, and the electromagnetic coupled magnetic core of this High Frequency Current Sensor adopts the ultracrystallite material, and magnetic core has air gap.
4. portable cable local discharge detection device according to claim 2 is characterized in that, it is the microstrip antenna of 500MHz-1.5GHz that described uhf sensor adopts frequency band.
5. portable cable local discharge detection device according to claim 2 is characterized in that, described sonac is the piezo-electric type calibrate AE sensor, and resonance frequency is 30kHz, and frequency band is 20kHz-180kHz.
6. portable cable local discharge detection device according to claim 2 is characterized in that, described infrared temperature sensor is contactless infrared temperature sensor.
7. portable cable local discharge detection device according to claim 1, it is characterized in that, described sense terminals comprises: signal condition unit and data acquisition unit, wherein: the signal condition unit is connected with sensor to receive the analog sensed signal, the output terminal of signal condition unit is connected with data acquisition unit with output analog sensed signal, the output terminal of signal condition unit is connected with control module with output infrared temperature signal, the data acquisition unit output steering order that is connected with the signal condition unit, data acquisition unit are connected with control module with selectivity output high-frequency current signal, a kind of or its combination in ultra-high frequency signal or the ultrasonic signal also receives steering order.
8. according to claim 1 or 7 described portable cable local discharge detection devices, it is characterized in that described sense terminals is provided with 3 machine two-way switches, realizes the manual switchover of manual steering order.
9. portable cable local discharge detection device according to claim 1, it is characterized in that, described control module comprises: office's discharge signal processing unit, feature extraction unit and analyzing and diagnosing unit are put in office, wherein: office's discharge signal processing unit is connected with sense terminals to receive the analog sensed signal, office's discharge signal processing unit adopts FIR filtering, FFT filtering or wavelet filtering send detection signal to office after with the noise filtering in the analog sensed signal and put feature extraction unit, office puts feature extraction unit and exports characteristic spectrum in the detection signal and discharge to the analyzing and diagnosing unit after the fingerprint extraction, and the analyzing and diagnosing unit is to characteristic spectrum and discharge fingerprint analysis assessment and output testing result.
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| CN2009103109912A CN101750573B (en) | 2009-12-07 | 2009-12-07 | Portable cable local discharge detection device |
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Cited By (28)
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| CN101975912A (en) * | 2010-09-09 | 2011-02-16 | 广东电网公司中山供电局 | Transformer partial discharge on-line monitoring method and device |
| CN102279350A (en) * | 2011-03-31 | 2011-12-14 | 广东电网公司广州供电局 | Ultrasonic wave partial discharge detection analyzer |
| CN102288882A (en) * | 2011-08-16 | 2011-12-21 | 重庆大学 | Partial discharge monitoring system and method for multichannel electrical equipment |
| CN102331540A (en) * | 2011-05-26 | 2012-01-25 | 江苏科技大学 | On-line monitoring device and method for corona discharge of ultra-high voltage power transmission line |
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