CN102967808A - Handheld partial discharge detector of transformer - Google Patents
Handheld partial discharge detector of transformer Download PDFInfo
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- CN102967808A CN102967808A CN201210505342XA CN201210505342A CN102967808A CN 102967808 A CN102967808 A CN 102967808A CN 201210505342X A CN201210505342X A CN 201210505342XA CN 201210505342 A CN201210505342 A CN 201210505342A CN 102967808 A CN102967808 A CN 102967808A
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Abstract
The invention provides a handheld partial discharge detector of a transformer. The handheld partial discharge detector comprises an ultrasonic sensor, a high-frequency current sensor, a data acquisition module, a signal conditioning unit and a data diagnosis and analysis module, wherein the data acquisition module is used for acquiring detection data according to a discharge signal and a high-frequency current pulse signal, wherein the detection data comprise ultrasonic sensor data and high-frequency current sensor data; the signal conditioning unit is used for receiving the detection data transmitted by the data acquisition module and carrying out the pre-process on the detection data to generate data to be analyzed; and the data diagnosis and analysis module is sued for carrying out local discharge detection analysis according to the data to be analyzed. The handheld partial discharge detector of the transformer, disclosed by the invention, can carry out effective detection and analysis on a local discharge signal of the transformer generated to a field transformer and judges whether the interior of the transformer generates local discharge or not through sound and electricity combined analysis, and carries out qualitative estimation on the intensity of the local discharge signal so as to have the advantages of compact structure, handheld type, portability, convenience in detection and the like.
Description
Technical field
The invention belongs to the charged detection technique of Electric Power Equipment Insulation field, especially partial discharge of transformer pick-up unit, be specifically related to hand-held partial discharge of transformer pick-up unit.
Technical background
Along with advancing by leaps and bounds of China's power industry construction, modern power systems is just towards large electrical network, large unit, UHV (ultra-high voltage), jumbo future development, for ensureing stability, the reliability of electric system, the safe coefficient of power equipment is also had higher requirement.
In recent years, transformer is widely used in urban distribution network, in case certain defective appears in transformer equipment inside, and generation fault very easily.Along with increasing of transformer substation quantity, the probability that transformer equipment breaks down is also increasing.Owing to it is believed that transformer equipment belonged to non-maintaining equipment in the past, in addition transformer substation negligible amounts, means and the measure of monitoring equipment fault are relatively limited.Therefore, strengthen and improve the operational monitoring of transformer equipment commissioning test and transformer equipment, significant to the safe operation that ensures transformer equipment.
Facts have proved that power transformer interior fault is take the insulativity fault as main.Partial discharge signal is one of important parameter of the transformer insulated performance of reflection, and it is transformer insulated deteriorated sign and the form of expression, is again further deteriorated reason of insulation.So, detect the insulation defect that the transformer partial discharge signal can find that it is inner early stage, in order to take measures, avoid its development.
Checkout equipment is put in office of the prior art, from the home market, most of Partial discharge detector can only extract a small amount of effectively signal from abundant local discharge signal, product mostly is fixed, and volume is larger, structure is comparatively complicated, and is portable poor, is not suitable for the general survey at present a large amount of transformers.On the present market, high-end Portable partial discharge detector is monopolized by some external traditional manufacturers of Partial discharge detector, expensive, being difficult to fund for some medium and small sized enterprises goes to buy, and domestic some Portable partial discharge detector functions of studying are also not too perfect, therefore it is relatively cheap to be necessary to develop a kind of cost, can eliminate various interference in the testing process, and local discharge signal intensity is made differentiation, have simultaneously good portable hand-held tester.
Summary of the invention
The object of the invention is to solve the how convenient and swift technical matters that effectively detects transformer insulated situation, provide a kind of hand-held acoustoelectric combined partial discharge of transformer pick-up unit.
According to an aspect of the present invention, provide a kind of hand-held partial discharge of transformer pick-up unit, comprise such as lower device:
Ultrasonic sensor is used for being attached to the transformer surface to detect the discharge signal from device interior;
High Frequency Current Sensor is for the high-frequency current pulse signal that flows through on the ground wire with coupling transformer around the ground wire that is socketed in transformer;
Data acquisition module is used for detecting data according to described discharge signal and high-frequency current pulse signal acquisition, and wherein, described detection data comprise Ultrasonic Sensor Data and High Frequency Current Sensor data;
The signal condition unit be used for to receive the detection data that send from described data acquisition module, and described detection data are carried out pre-service generates data to be analyzed;
The data diagnosis analysis module is used for carrying out the Partial Discharge Detection analysis according to described data to be analyzed.
Preferably, described signal condition unit comprises bandpass filter, logarithmic amplifier and the stretch circuit that connects successively.
Preferably, described data diagnosis analysis module comprises such as lower module:
The data integrity detection module is for the integrality that checks described data to be analyzed;
The Partial discharge signal processing module, be used for by FIR filtering, FFT filtering and wavelet filtering mode, the much noise of filtering Test Field disturbs, and then obtains the Partial discharge signal of high s/n ratio, the original waveform of recovery voltage general ability section discharge signal from described data to be analyzed;
The analyzing and diagnosing module is used for described Partial discharge signal is analyzed, and judges the order of severity of shelf depreciation, insulation status and the degree of aging of assessment transformer.
Preferably, described High Frequency Current Sensor is the pincers type High Frequency Current Sensor in 500kHz～50MHz frequency band.
Preferably, described ultrasonic sensor employing frequency band is the ultrasonic sensor in 20kHz～300kHz.
Preferably, the highest sample frequency 50MHz of described data acquisition module, AD resolution 12bit adopts the high-frequency coupling input mode.
Preferably, described signal condition unit is according to the ultrasonic signal corresponding with described discharge signal and the different frequency bands characteristic of high-frequency current pulse signal, dispose respectively the signal condition passage of multiple different filtered band, realize selecting arbitrarily the signal of a certain centre frequency of certain bandwidth.
Preferably, also comprise data memory module and USB communication interface, wherein, described data memory module is used for storing described Ultrasonic Sensor Data, High Frequency Current Sensor data and diagnostic analysis data, and described USB communication interface is used for data transmission such as described ultrasonic sensor and High Frequency Current Sensor to host computer.
Preferably, described data acquisition module carries out independent preservation to described Ultrasonic Sensor Data and High Frequency Current Sensor data, described Partial discharge signal processing module is processed respectively described Ultrasonic Sensor Data and High Frequency Current Sensor data, and described data diagnosis analysis module carries out the acoustoelectric signal Conjoint Analysis and provides diagnosis according to the result of described Partial discharge signal processing module.
The present invention can effectively detect and analyze the transformer partial discharge signal that on-the-spot transformer produces by acoustoelectric combined analysis, judges whether transformer inside has office to put generation, and the power of Partial discharge signal is estimated qualitatively.Equipment satisfies light demand, by lithium battery power supply, makes things convenient for the staff to carry out Daily Round Check.Compare with additive method, ultrasound wave and high-frequency current detection method have that sensitivity is higher, antijamming capability is strong, can identify fault type and the advantage such as position.Compact conformation of the present invention is hand-held, carries easy to detectly, and high efficiency has higher sensitivity and signal to noise ratio (S/N ratio), adopts transformer belt electro-detection method, can effectively detect partial discharge of transformer at the scene.
Description of drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is the synoptic diagram that carries out the shelf depreciation test according to hand-held partial discharge of transformer pick-up unit provided by the invention;
Fig. 2 is the data processor block diagram according to hand-held partial discharge of transformer pick-up unit provided by the invention;
Fig. 3 is the DAP block diagram according to hand-held partial discharge of transformer pick-up unit provided by the invention;
Fig. 4 is the structural representation according to hand-held partial discharge of transformer pick-up unit provided by the invention.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.Following examples will help those skilled in the art further to understand the present invention, but not limit in any form the present invention.Should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
According to hand-held partial discharge of transformer pick-up unit 4 provided by the invention, comprise ultrasonic sensor 401, High Frequency Current Sensor 402, data acquisition module 41, signal condition unit 42, data diagnosis analysis module 43, data memory module and USB communication interface.Wherein, described ultrasonic sensor 401 is used for being attached to the transformer surface to detect the discharge signal from device interior; High Frequency Current Sensor 402 is for the high-frequency current pulse signal that flows through on the ground wire with coupling transformer around the ground wire that is socketed in transformer.The on-the-spot using method of described hand-held partial discharge of transformer pick-up unit 4 as shown in Figure 1, among the figure: 10 is transformer body, and 100 is the transformer grounding line.
Described data acquisition module 41 is used for detecting data according to described discharge signal and high-frequency current pulse signal acquisition, and wherein, described detection data comprise Ultrasonic Sensor Data and High Frequency Current Sensor data; Described signal condition unit 42 is used for receiving the detection data that send from described data acquisition module, and described detection data are carried out pre-service generates data to be analyzed; Described data diagnosis analysis module 43 is used for carrying out the Partial Discharge Detection analysis according to described data to be analyzed.Described data memory module is used for storing described Ultrasonic Sensor Data and High Frequency Current Sensor data, described USB communication interface is used for described Ultrasonic Sensor Data and High Frequency Current Sensor data transmission to host computer, particularly, the image data result is put in hand-held partial discharge of transformer pick-up unit 4 storage inside offices, it is furnished with the USB communication interface, can allow upper computer software by the usb data interface data result be imported in the host computer in pick-up unit, and preserve management.
Particularly, described signal condition unit 42 comprises bandpass filter 421, logarithmic amplifier 422 and the stretch circuit 423 that connects successively.Described data diagnosis analysis module 43 comprises data integrity detection module 431, Partial discharge signal processing module 432, analyzing and diagnosing module 433.Wherein, described data integrity detection module 431 is used for checking the integrality of described data to be analyzed; Described Partial discharge signal processing module 432 is used for by FIR filtering, FFT filtering and wavelet filtering mode, the much noise of filtering Test Field disturbs, and then from described data to be analyzed, obtain the Partial discharge signal of high s/n ratio, the original waveform of recovery voltage general ability section discharge signal; Described analyzing and diagnosing module 433 is used for described Partial discharge signal is analyzed, and judges the order of severity of shelf depreciation, insulation status and the degree of aging of assessment transformer.The highest sample frequency 50MHz of described data acquisition module 41, AD resolution 12bit, input signal reduces the low frequency signal disturbing effect by the high-frequency coupling input mode as far as possible.
More specifically, described signal condition unit 42 disposes respectively the signal condition passage of multiple different filtered band according to the different frequency bands characteristic of described ultrasonic signal and high-frequency current pulse signal, realizes selecting arbitrarily the signal of a certain centre frequency of certain bandwidth.41 pairs of described Ultrasonic Sensor Data of described data acquisition module and High Frequency Current Sensor data are carried out independent preservation, 432 pairs of described Ultrasonic Sensor Data of described Partial discharge signal processing module and High Frequency Current Sensor data are processed respectively, and described data diagnosis analysis module 433 carries out the acoustoelectric signal Conjoint Analysis according to the result of described Partial discharge signal processing module 432.
In a preference of present embodiment, described High Frequency Current Sensor 402 is the pincers type High Frequency Current Sensor in 500kHz～50MHz frequency band, when transformer inside has office to put pulse, the inner discharge current that produces of transformer imports to the earth by the transformer grounding line, described High Frequency Current Sensor 402 is socketed in around the ground wire, the high-frequency current pulse signal that flows through on the energy efficient coupling ground wire.It is the ultrasonic sensor of 20kHz～300kHz that described ultrasonic sensor 401 adopts frequency band, and described ultrasonic sensor 401 should directly be affixed on device outer surface, guarantees the smooth and inclusion-free of surface of contact.Because ultrasound wave is rapidly decay in air, between any small air gap between sensor and attaching surface thereof also may cause can't be effectively that ultrasonic signal in the volume, therefore need and will spread on the installation surface of described ultrasonic sensor 401 and should guarantee in the silicone grease layer not bubbles less than the thick vacuum silicone grease of 1mm.
Further preferably, the embedded main control chip of ARM is used in the inside of described hand-held partial discharge of transformer pick-up unit 4, so that the high-speed data handling property to be provided, realize respectively the functions such as data acquisition, data demonstration, data storage, realize in addition control and the demonstration of human-computer interaction interface.The program of embedded software realizes framework as shown in Figure 2.Described hand-held partial discharge of transformer pick-up unit 4 adopts the small-size hand-hold design, and the high size of the length and width of complete machine is no more than 200cm * 120cm * 40cm, is easy to hand-held assurance, and use is patrolled and examined at the scene.Power acquisition lithium battery power supply, but continuous working more than 8 hours, and light little facility, main frame weight is no more than 0.5 kilogram.
More than specific embodiments of the invention are described.It will be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (9)
1. a hand-held partial discharge of transformer pick-up unit is characterized in that, comprises such as lower device:
Ultrasonic sensor is used for being attached to the transformer surface to detect the discharge signal from device interior;
High Frequency Current Sensor is for the high-frequency current pulse signal that flows through on the ground wire with coupling transformer around the ground wire that is socketed in transformer;
Data acquisition module is used for detecting data according to described discharge signal and high-frequency current pulse signal acquisition, and wherein, described detection data comprise Ultrasonic Sensor Data and High Frequency Current Sensor data;
The signal condition unit be used for to receive the detection data that send from described data acquisition module, and described detection data are carried out pre-service generates data to be analyzed;
The data diagnosis analysis module is used for carrying out the Partial Discharge Detection analysis according to described data to be analyzed.
2. hand-held partial discharge of transformer pick-up unit according to claim 1 is characterized in that, described signal condition unit comprises bandpass filter, logarithmic amplifier and the stretch circuit that connects successively.
3. hand-held partial discharge of transformer pick-up unit according to claim 1 is characterized in that, described data diagnosis analysis module comprises such as lower module:
The data integrity detection module is for the integrality that checks described data to be analyzed;
The Partial discharge signal processing module, be used for by FIR filtering, FFT filtering and wavelet filtering mode, the much noise of filtering Test Field disturbs, and then obtains the Partial discharge signal of high s/n ratio, the original waveform of recovery voltage general ability section discharge signal from described data to be analyzed;
The analyzing and diagnosing module is used for described Partial discharge signal is analyzed, and judges the order of severity of shelf depreciation, insulation status and the degree of aging of assessment transformer.
4. hand-held partial discharge of transformer pick-up unit according to claim 1 is characterized in that, described High Frequency Current Sensor is the pincers type High Frequency Current Sensor in 500kHz～50MHz frequency band.
5. hand-held partial discharge of transformer pick-up unit according to claim 1 is characterized in that, it is the interior ultrasonic sensor of 20kHz～300kHz that described ultrasonic sensor adopts frequency band.
6. hand-held partial discharge of transformer pick-up unit according to claim 1 is characterized in that, the highest sample frequency 50MHz of described data acquisition module, and AD resolution 12bit adopts the high-frequency coupling input mode.
7. hand-held partial discharge of transformer pick-up unit according to claim 1, it is characterized in that, described signal condition unit is according to the ultrasonic signal corresponding with described discharge signal and the different frequency bands characteristic of high-frequency current pulse signal, dispose respectively the signal condition passage of multiple different filtered band, to realize to select arbitrarily the signal of a certain centre frequency of certain bandwidth.
8. hand-held partial discharge of transformer pick-up unit according to claim 1, it is characterized in that, also comprise data memory module and USB communication interface, wherein, described data memory module is used for storing described Ultrasonic Sensor Data, High Frequency Current Sensor data and diagnostic analysis data, and described USB communication interface can be used for related data transmission such as described ultrasonic sensor and High Frequency Current Sensor to host computer.
9. hand-held partial discharge of transformer pick-up unit according to claim 3, it is characterized in that, described data acquisition module carries out independent preservation to described Ultrasonic Sensor Data and High Frequency Current Sensor data, described Partial discharge signal processing module is processed respectively described Ultrasonic Sensor Data and High Frequency Current Sensor data, and described data diagnosis analysis module carries out the acoustoelectric signal Conjoint Analysis and provides diagnosis according to the result of described Partial discharge signal processing module.
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| CN201210505342XA CN102967808A (en) | 2012-11-23 | 2012-11-30 | Handheld partial discharge detector of transformer |
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| CN201210484577 | 2012-11-23 | ||
| CN201210484577.5 | 2012-11-23 | ||
| CN201210505342XA CN102967808A (en) | 2012-11-23 | 2012-11-30 | Handheld partial discharge detector of transformer |
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Cited By (13)
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|---|---|---|---|---|
| CN103197211A (en) * | 2013-03-28 | 2013-07-10 | 国家电网公司 | Switch cabinet partial discharge itinerant detector |
| CN103197215A (en) * | 2013-04-09 | 2013-07-10 | 国家电网公司 | System and method for discharge fault location of geographic information system (GIS) alternating current (AC) voltage withstand test |
| CN103439680A (en) * | 2013-08-30 | 2013-12-11 | 国家电网公司 | Calibration method for ultrahigh frequency partial discharge state detecting instrument |
| CN103675618A (en) * | 2013-11-30 | 2014-03-26 | 成都科泰地理信息技术有限公司 | Switchgear partial discharge inspecting instrument with printing function |
| CN103926513A (en) * | 2014-04-30 | 2014-07-16 | 国网河南省电力公司商丘供电公司 | Portable ultrasonic online detection partial discharge diagnostic device |
| CN106443389A (en) * | 2016-11-03 | 2017-02-22 | 合肥华义电气科技有限公司 | Partial discharge monitoring device of switch cabinet |
| CN106841939A (en) * | 2016-12-23 | 2017-06-13 | 西安交通大学 | The portable acoustoelectric combined detection means of GIS partial discharge and its detection method |
| 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 |
| CN110850249A (en) * | 2019-11-28 | 2020-02-28 | 国网青海省电力公司 | Transformer bushing insulation partial discharge monitoring system and method |
| CN110864801A (en) * | 2019-10-30 | 2020-03-06 | 国网福建省电力有限公司检修分公司 | Transformer noise and vibration on-line monitoring and fault analysis system |
| CN110865281A (en) * | 2019-10-22 | 2020-03-06 | 国网江苏省电力有限公司电力科学研究院 | Cable partial discharge detection device and method based on edge calculation |
| CN113092972A (en) * | 2021-06-07 | 2021-07-09 | 杭州兆华电子有限公司 | Partial discharge type identification method and device based on non-contact ultrasonic sensor |
| CN114441910A (en) * | 2022-01-28 | 2022-05-06 | 上海格鲁布科技有限公司 | High-precision anti-interference partial discharge live detection device |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103197211A (en) * | 2013-03-28 | 2013-07-10 | 国家电网公司 | Switch cabinet partial discharge itinerant detector |
| CN103197215B (en) * | 2013-04-09 | 2015-11-18 | 国家电网公司 | GIS AC voltage withstand test discharge fault positioning system and method |
| CN103197215A (en) * | 2013-04-09 | 2013-07-10 | 国家电网公司 | System and method for discharge fault location of geographic information system (GIS) alternating current (AC) voltage withstand test |
| CN103439680A (en) * | 2013-08-30 | 2013-12-11 | 国家电网公司 | Calibration method for ultrahigh frequency partial discharge state detecting instrument |
| CN103675618A (en) * | 2013-11-30 | 2014-03-26 | 成都科泰地理信息技术有限公司 | Switchgear partial discharge inspecting instrument with printing function |
| CN103926513B (en) * | 2014-04-30 | 2016-08-17 | 国家电网公司 | A kind of portable supersonic on-line checking shelf depreciation diagnostic device |
| CN103926513A (en) * | 2014-04-30 | 2014-07-16 | 国网河南省电力公司商丘供电公司 | Portable ultrasonic online detection partial discharge diagnostic device |
| 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 |
| CN106443389A (en) * | 2016-11-03 | 2017-02-22 | 合肥华义电气科技有限公司 | Partial discharge monitoring device of switch cabinet |
| CN106841939A (en) * | 2016-12-23 | 2017-06-13 | 西安交通大学 | The portable acoustoelectric combined detection means of GIS partial discharge and its detection method |
| CN110865281A (en) * | 2019-10-22 | 2020-03-06 | 国网江苏省电力有限公司电力科学研究院 | Cable partial discharge detection device and method based on edge calculation |
| CN110864801A (en) * | 2019-10-30 | 2020-03-06 | 国网福建省电力有限公司检修分公司 | Transformer noise and vibration on-line monitoring and fault analysis system |
| CN110850249A (en) * | 2019-11-28 | 2020-02-28 | 国网青海省电力公司 | Transformer bushing insulation partial discharge monitoring system and method |
| CN113092972A (en) * | 2021-06-07 | 2021-07-09 | 杭州兆华电子有限公司 | Partial discharge type identification method and device based on non-contact ultrasonic sensor |
| CN114441910A (en) * | 2022-01-28 | 2022-05-06 | 上海格鲁布科技有限公司 | High-precision anti-interference partial discharge live detection device |
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Application publication date: 20130313 |