CN201974503U - Ultrasonic partial discharge detection analyser - Google Patents

Ultrasonic partial discharge detection analyser Download PDF

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Publication number
CN201974503U
CN201974503U CN2011200912184U CN201120091218U CN201974503U CN 201974503 U CN201974503 U CN 201974503U CN 2011200912184 U CN2011200912184 U CN 2011200912184U CN 201120091218 U CN201120091218 U CN 201120091218U CN 201974503 U CN201974503 U CN 201974503U
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CN
China
Prior art keywords
signal
parameter
unit
frequency domain
office
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CN2011200912184U
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Chinese (zh)
Inventor
陆国俊
熊俊
黄炎光
杨柳
田立斌
周玲
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广东电网公司广州供电局
华南理工大学
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Priority to CN2011200912184U priority Critical patent/CN201974503U/en
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Publication of CN201974503U publication Critical patent/CN201974503U/en

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Abstract

The utility model provides an ultrasonic partial discharge detection analyser which comprises a signal acquisition unit, a signal processing unit and an equipment maintenance decision unit, wherein the signal acquisition unit is used for receiving sound signals input from the outside and converted from ultrasonic signals, and conducting adjustment and analog-to-digital conversion on the received sound signals; the signal processing unit is used for conducting time domain and frequency domain characteristics analysis to the signals after the analog-to-digital conversion, extracting time domain characteristic parameters and frequency domain characteristic parameters and comparing the time domain characteristic parameters and the frequency domain characteristic parameters with samples stored in a sample database according to threshold values prestored and corresponding to each type of time domain and frequency domain characteristic parameter, thereby judging whether the existence of partial discharge and the discharge degree; and the equipment maintenance decision unit is used for receiving the judgment result of the signal processing unit and outputting and displaying the judgment result. The analyser can monitor the running state of high voltage equipment in time so as to find potential faults in advance.

Description

The check and analysis instrument is put in a kind of ultrasound wave office
Technical field
The utility model relates to the on-line monitoring of high voltage equipment insulation defective and patrols and examines technology, relates in particular to a kind of ultrasound wave office based on audio signal processing technique and puts the check and analysis instrument.
Background technology
The raising that power supply reliability is required along with the needs of electric system reform and development and user, the high-tension apparatus reliability of operation has been subjected to more and more higher attention, but the Insulation Problems at distribution mesohigh equipment is also more and more outstanding, has had a strong impact on the raising of power supply reliability.
Various types of high-tension apparatuses are widely used in the electric system, occupy critical role in electric power system, and high-tension apparatus is carried out insulating property detect and fault diagnosis, be the prerequisite that realizes equipment state overhauling.Electricity, heat, the chemical insulation degradation that forms under the abnormal conditions that reaches will inevitably take place in electrical equipment in long-term operational process, cause electric insulation intensity to reduce, even can cause equipment failure.
Present stage is domestic mainly to be according to the requirement of " power equipment preventive trial rules " high-tension apparatus in the distribution to be carried out regular preventive trial, but all there is limitation in preventive trial aspect economic angle, technical standpoint and the on-the-spot use in implementation process.
By measurement high-tension apparatus shelf depreciation produces in operational process electromagnetic wave signal and ultrasonic signal, thereby the operation conditions of judgment device is a method of testing relatively more commonly used at present.These methods obtain quoting of lot of domestic and international company, and are respond well, can provide strong technical support for the state of insulation maintenance of equipment.
External present Partial Discharge Detection for high-tension apparatus, the way of comparative maturity is the ultrasonic signal that the detected discharge of ultrasonic sensor is produced, utilize process of heterodyning received conversion of signals to be become people's ear can be heard, discernible sound signal, and the mode of signal with acoustic pressure shown, the testing staff comes judgment device whether to have electric discharge phenomena by analyzing the sound and the acoustic pressure size on the display unit that transmit in the earphone.This kind equipment all just possesses the general ability of patrolling and examining, can not carry out reductive analysis for patrolling and examining the data that obtain, therefore, the testing staff can only judge the running status of high-tension apparatus according to detected data at that time, can't judgment device whether change on the whole, can not provide about high-tension apparatus in-problem more careful criterion clearly whether.Such checkout equipment has only terminal, and terminal do not possess data storage capacities, does not more possess data are carried out analysis integrated ability.On the other hand, the detectability of this kind equipment and operating personnel's subjective initiative are closely bound up, and testing staff's experienced degree is the last resolution of influence directly, have the hidden danger of erroneous judgement.
Summary of the invention
The purpose of this utility model is to provide a kind of ultrasound wave office to put the check and analysis instrument, can in time monitor the running status of high-tension apparatus, finds potential fault in advance.
The check and analysis instrument is put in the ultrasound wave office that the utility model provides, and comprises signal gathering unit, signal processing unit and maintenance of equipment decision package,
Described signal gathering unit is used to receive the sound signal of being come by the ultrasonic signal conversion of outside input, and the sound signal that receives is adjusted and analog to digital conversion;
Described signal processing unit is used for the signal after the described analog to digital conversion is carried out the time-domain frequency-domain characteristic analysis and extracts temporal signatures parameter and frequency domain character parameter; And with the sample in the sample storehouse of described temporal signatures parameter and frequency domain character parameter and storage in advance, according to comparing of storing in advance, shelf depreciation and discharge severity have been judged whether with described temporal signatures parameter of every class and frequency domain character parameter corresponding threshold;
The maintenance of equipment decision package is used to receive the judged result output of described signal processing unit and show.
The utility model ultrasound wave office puts the check and analysis instrument and has improved detection efficiency is patrolled and examined at the scene of high-tension apparatus, and signal processing unit makes the utility model possess data storage and data analysis integration capability; Secondly, the utility model is converted to the ultrasonic signal that extracts sound signal and time-domain and frequency-domain is carried out specificity analysis, utilize audio signal processing technique signal to be carried out specificity analysises such as time-domain and frequency-domain, extract characteristic parameter, data, waveform are carried out the generation of the great electric power accident of the more accurate prevention of analysis and synthesis, further reduce the economic loss of bringing because of electric power accident.
Description of drawings
Fig. 1 is the theory diagram of the utility model embodiment 1;
Fig. 2 is the theory diagram of an embodiment of signal gathering unit;
Fig. 3 is the theory diagram of an embodiment of signal processing unit;
Fig. 4 is the theory diagram of an embodiment of maintenance of equipment decision package;
Fig. 5 is the theory diagram that the check and analysis instrument is put in ultrasound wave office in the preferred embodiment.
Embodiment
Embodiment 1: as shown in Figure 1, the check and analysis instrument is put in ultrasound wave of the present utility model office, comprise signal gathering unit, signal processing unit and maintenance of equipment decision package, signal gathering unit receives the sound signal of being come by the ultrasonic signal conversion of outside input, the sound signal that receives is carried out pre-service, comprise the adjustment and the analog to digital conversion of signal.The processing processing comprises the time-domain frequency-domain characteristic analysis to signal processing unit to do further through pretreated signal, sound pressure level analysis and extract each characteristic parameter, store in advance in the signal processing unit sample storehouse that judges whether shelf depreciation and discharge severity and with every class temporal signatures parameter and the corresponding threshold value of frequency domain character parameter, signal processing unit extracts the temporal signatures parameter by the time domain specification analysis, extract the frequency domain character parameter by frequency district characteristic analysis, compare with the threshold value of storage in advance then, judged result is exported to the maintenance of equipment decision package.The maintenance of equipment decision package is according to each characteristic parameter output and show maintenance policy, comprises whether shelf depreciation and discharge severity are arranged.
Embodiment 2: present embodiment has been done further improvement on the basis of embodiment 1, ultrasound wave of the present utility model office puts the check and analysis instrument and also comprises earphone, the tester can judge whether shelf depreciation and discharge severity according to the display result of maintenance of equipment decision package on the one hand when detecting, can also judge whether shelf depreciation and discharge severity by the sound of hearing in the earphone simultaneously.Because the signal of hearing in earphone away from the office source of putting is a background noise information, therefore the background noise information that mixed of the sound in the earphone, hearing that relatively can be by the people with the sound signal in the earphone and background noise information has judged whether shelf depreciation and discharge severity as the means of an auxiliary monitoring.
Embodiment 3: Fig. 2 is an embodiment of signal gathering unit, signal gathering unit comprises signal adjustment unit and ADC (Analog-to-Digital Conventer, analog-digital converter) converting unit, signal adjustment unit is connected with the ADC converting unit, this signal adjustment unit is adjusted the simulating signal that receives, and is convenient to the ADC converting unit the further processing of signal is handled.Because the output signal of ultrasonic sensor is some smaller voltages, electric current or impedance variation value normally, therefore need simulating signal necessarily be adjusted before being converted into numerical data by signal adjustment unit, for example amplification, filtering, buffering, or simulating signal enlarged, with it as the input that is fit to the ADC converting unit.Described ADC converting unit is the digital signal that is suitable for the signal processing unit operation to operations such as adjusted analog signal sampling, quantifications with conversion of signals.
Embodiment 4: Fig. 3 is an embodiment of signal processing unit, comprise flush bonding processor, data storage cell and communication apparatus, flush bonding processor is connected with the output terminal of signal gathering unit, and as an embodiment, flush bonding processor can be connected with the ADC converting unit among Fig. 2.Flush bonding processor is connected with data storage cell is two-way, and wireless telecommunications system is connected with flush bonding processor.As an embodiment, flush bonding processor can be a dsp chip.Flush bonding processor carries out specificity analysises such as time domain frequency domain to the signal that is received, in time domain, extract the temporal signatures parameter, comprise the shelf depreciation amplitude, that phase place, discharge frequency, attenuation coefficient, coefficient of autocorrelation, short-time average magnitude are put in office is poor, and time-domain signal carried out the FFT conversion, extract the frequency domain character parameter, comprise amplitude, power, discharge frequency span and the centre frequency of frequency component.What deserves to be mentioned is that communication facilities can be that wireless communication module also can be a wire communication facility.Described data storage cell is used for the storage and management of data, store the temporal signatures parameter sample that judges whether shelf depreciation and discharge severity and the sample storehouse of frequency domain character parameter sample in advance, store in advance in the flush bonding processor that (threshold value is adjustable with all types of temporal signatures parameters and frequency domain character parameter corresponding threshold, it is not the corresponding threshold value of a sample, but through the empirical value that obtains after the test of many times, and can adjust), each characteristic parameter that extracted and the sample in the sample storehouse are compared, whether there is the order of severity of shelf depreciation and discharge according to threshold decision, then judged result exported to the maintenance of equipment decision package by wireless telecommunications system or wire communication equipment.As an embodiment, data storage cell is served as by data storage card.In addition, as a preferred embodiment, before the characteristic parameter that flush bonding processor extracts, in data storage cell, do not store as yet, can be according to the relevant characteristic parameter of predetermined condition storage, for example can deposit effective characteristic parameter in data storage cell, effectively characteristic parameter is meant to judging the characteristic parameter that works in the future, to enrich the specimen types in sample storehouse.
Present embodiment uses the embedded technology Application and Development, volume is little, in light weight being easy to carry, instrument be input as sound signal, the time-domain frequency-domain characteristic parameter of extract real-time sound signal, adopt GPRS or WIFI mode to network and carry out real-time Data Transmission, utilize speech recognition technology to carry out simple fault and judge.External cabling simultaneously is few, the security that has improved execute-in-place.
Embodiment 5: Fig. 4 is the embodiment of maintenance of equipment decision package, comprise decision analysis unit and display unit, the decision analysis unit is connected with the output terminal of signal processing unit, as an embodiment, can with communication apparatus among Fig. 3 by wireless connections, wireless telecommunications system transfers data to the decision analysis unit by GPRS or WIFI mode.Certainly, also can transmit by wired mode.In addition, can also the decision analysis unit further comprise the waveform output module, the characteristic parameter output waveform that responsible basis receives, regulate control module, be responsible for adjusting, the selection of information and the switching manipulation of control and instrument of signal gain size, display unit can also comprise waveform display unit etc.
The decision analysis unit receives the judged result and the display reminding information of signal processing unit, whether prompting has the order of severity information of discharge and discharge, signal processing unit also can send to the characteristic parameter that is extracted the decision analysis unit in addition, in addition can also be in the audio frequency acquiring signal stored waveform information, and send to the decision analysis unit, decision analysis unit output characteristics parameter and shape information show to display unit, for the user insulation defect of equipment are comprehensively judged.
Embodiment 6: also comprise in the present embodiment being used for the audio interface take-up ultrasound wave is converted to sound signal.Described audio interface take-up is responsible for the sound signal of conversion is inserted instrument, and signal is transferred to signal gathering unit.
In order to understand the utility model more clearly, Fig. 5 has enumerated a preferred embodiment of the present utility model, at first this device is connected with ultrasonic sensor in the present embodiment, as shown in the figure: the audio interface take-up is converted to sound signal after receiving ultrasonic signal, sound signal one tunnel is transferred in the earphone monitors in order to the testing staff; Another road is transferred to signal adjustment unit, signal adjustment unit is convenient to the analog to digital conversion of carrying out of ADC converting unit to the simulated audio signal adjustment that receives, the output terminal of ADC converting unit is connected with the input end of dsp chip, dsp chip stores and various types of temporal signatures parameters and the corresponding threshold value of frequency domain character parameter in advance, dsp chip carries out time-domain analysis to received digital signal, extract the temporal signatures parameter, simultaneously signal is carried out the FFT conversion and extract the frequency domain character parameter, dsp chip is connected with data storage cell is two-way, the output terminal of DSP is connected with the input end of wireless telecommunications system, dsp chip with in the temporal signatures parameter extracted and frequency domain character parameter and the data storage cell in advance the sample data of storage compare, draw comparison result according to pre-set threshold, if and do not store temporal signatures parameter or the frequency domain character parameter that is extracted in the data storage cell, would then deposit needed characteristic parameter in data storage cell according to comparison result.Wireless device is transferred to the decision analysis unit with the temporal signatures parameter that DSP extracted and the judged result of frequency domain character parameter and dsp chip, in the decision analysis unit, export received characteristic parameter by display unit shows signal waveform, some time-domain and frequency-domain characteristic parameters and some decision-making informations.DSP can also store the sound signal that receives in addition, in sound signal, be doped with the background noise that measures when putting the source away from office, these background noises are exported to the decision analysis unit, display unit display background noise waveform and shelf depreciation sound signal waveform just can be exported in the decision analysis unit, and the user selects to regulate accordingly button as required and adjusts waveform.
The utility model ultrasound wave office puts that check and analysis instrument volume is little, in light weight to be easy to carry, improved detection efficiency is patrolled and examined at the scene of high-tension apparatus, the application of data storage cell and flush bonding processor makes the utility model possess data storage and data analysis integration capability; Secondly, the utility model is converted to the ultrasonic signal that extracts sound signal and time-domain and frequency-domain is carried out specificity analysis, utilize audio signal processing technique signal to be carried out specificity analysises such as time-domain and frequency-domain, extract characteristic parameter, data, waveform are carried out analysis and synthesis, in conjunction with the voice signal of hearing in the earphone, and compare judgement, obtain the more careful state of insulation clearly of high-tension apparatus and describe with background noise information.The generation of the great electric power accident of more accurate prevention further reduces the economic loss of bringing because of electric power accident.
The utility model can realize detecting preservation, the analysis and synthesis of data by on-the-spot portable detection, and fault is simply judged, grasps the function of high-tension apparatus running status comprehensively.
Above-described the utility model embodiment does not constitute the qualification to the utility model protection domain.Any modification of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the claim protection domain of the present utility model.

Claims (9)

1. the check and analysis instrument is put in a ultrasound wave office, it is characterized in that, comprises signal gathering unit, signal processing unit and maintenance of equipment decision package,
Described signal gathering unit is used to receive the sound signal of being come by the ultrasonic signal conversion of outside input, and the sound signal that receives is adjusted and analog to digital conversion;
Described signal processing unit is used for the signal after the described analog to digital conversion is carried out the time-domain frequency-domain characteristic analysis and extracts temporal signatures parameter and frequency domain character parameter; And with the sample in the sample storehouse of described temporal signatures parameter and frequency domain character parameter and storage in advance, according to comparing of storing in advance, shelf depreciation and discharge severity have been judged whether with described temporal signatures parameter of every class and frequency domain character parameter corresponding threshold;
The maintenance of equipment decision package is used to receive the judged result output of described signal processing unit and show.
2. the check and analysis instrument is put in ultrasound wave according to claim 1 office, it is characterized in that: also comprise earphone interface, be used to receive the sound signal of being come by the ultrasonic signal conversion of outside input.
3. the check and analysis instrument is put in ultrasound wave according to claim 1 office, and it is characterized in that: described signal gathering unit comprises signal adjustment unit and ADC converting unit;
Described signal adjustment unit is used for, and the sound signal that receives is adjusted;
Described ADC converting unit is used to carry out analog to digital conversion.
4. put the check and analysis instrument according to any described ultrasound wave office in the claim 1 to 3, it is characterized in that: described signal processing unit comprises flush bonding processor, data storage cell and communication facilities;
Described data storage cell is used to store described sample storehouse;
Described embedded device, be used for storing in advance and described temporal signatures parameter of every class and frequency domain character parameter corresponding threshold, signal after the reception analog to digital conversion, carry out the time-domain frequency-domain characteristic analysis and extract temporal signatures parameter and frequency domain character parameter, and the sample in described temporal aspect parameter and frequency domain character parameter and the described sample storehouse compared, obtain comparison result according to described threshold value, judged whether shelf depreciation and discharge severity;
Described communication facilities is used for described maintenance of equipment decision package and communicates.
5. the check and analysis instrument is put in ultrasound wave according to claim 4 office, and it is characterized in that: described maintenance of equipment decision package comprises decision analysis unit and display unit;
The decision analysis unit is used to receive the judged result of the described embedded device that described communication facilities sends and exports to display unit;
Described display unit is used to show described judged result.
6. the check and analysis instrument is put in ultrasound wave according to claim 5 office, and it is characterized in that: described communication facilities comprises Wireless Telecom Equipment.
7. the check and analysis instrument is put in ultrasound wave according to claim 1 office, it is characterized in that: also comprise the audio interface take-up, be used for the ultrasonic signal of outside input is converted to sound signal.
8. the check and analysis instrument is put in ultrasound wave according to claim 1 office, it is characterized in that: it is poor that described temporal signatures parameter comprises the shelf depreciation amplitude, phase place, discharge frequency, attenuation coefficient, coefficient of autocorrelation, short-time average magnitude are put in office, and described frequency domain character parameter comprises amplitude, power, discharge frequency span and the centre frequency of frequency component.
9. the check and analysis instrument is put in ultrasound wave according to claim 4 office, it is characterized in that: whether described flush bonding processor also is used for judging described temporal signatures parameter and frequency domain character parameter in the existence of described sample storehouse and whether above described threshold value, and described temporal signatures parameter and frequency domain character parameter are stored into described data storage cell according to predetermined condition.
CN2011200912184U 2011-03-31 2011-03-31 Ultrasonic partial discharge detection analyser CN201974503U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN102360059A (en) * 2011-09-23 2012-02-22 上海市电力公司 Power transmission and distribution line partial discharge fault on-line detection method and apparatus thereof
CN102508129A (en) * 2011-10-27 2012-06-20 航天科工深圳(集团)有限公司 Insulator discharge detection method and device
CN104267326A (en) * 2014-10-23 2015-01-07 广州供电局有限公司 Partial discharge signal detection system
CN106249114A (en) * 2016-08-23 2016-12-21 上海华乘智能设备有限公司 Multifunctional belt electric detection means based on WIFI transmission and method
CN106405346A (en) * 2016-08-29 2017-02-15 广西塔锡科技有限公司 Partial discharge detection method and partial discharge detection device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN102360059A (en) * 2011-09-23 2012-02-22 上海市电力公司 Power transmission and distribution line partial discharge fault on-line detection method and apparatus thereof
CN102508129A (en) * 2011-10-27 2012-06-20 航天科工深圳(集团)有限公司 Insulator discharge detection method and device
CN104267326A (en) * 2014-10-23 2015-01-07 广州供电局有限公司 Partial discharge signal detection system
CN106249114A (en) * 2016-08-23 2016-12-21 上海华乘智能设备有限公司 Multifunctional belt electric detection means based on WIFI transmission and method
CN106405346A (en) * 2016-08-29 2017-02-15 广西塔锡科技有限公司 Partial discharge detection method and partial discharge detection device

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Granted publication date: 20110914