CN203929971U - Ultrasound wave Analysis of Partial Discharge instrument - Google Patents
Ultrasound wave Analysis of Partial Discharge instrument Download PDFInfo
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- CN203929971U CN203929971U CN201420114380.7U CN201420114380U CN203929971U CN 203929971 U CN203929971 U CN 203929971U CN 201420114380 U CN201420114380 U CN 201420114380U CN 203929971 U CN203929971 U CN 203929971U
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- 238000004458 analytical method Methods 0.000 title claims abstract description 18
- 238000002604 ultrasonography Methods 0.000 title claims abstract description 13
- 230000003321 amplification Effects 0.000 claims abstract description 16
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 239000000284 extract Substances 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005330 Barkhausen effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The ultrasound wave Analysis of Partial Discharge instrument that the utility model provides, comprises ultrasonic sensor, signal analysis amplifier, signal processor and Signal Monitor four parts; Ultrasonic sensor receives the ultrasonic signal of local discharge generation, and is converted into electric signal output; Signal amplifier carries out multilevel signal amplification and filtering by the electric signal of acceptance; Signal processor carries out time-domain and frequency-domain analysis and extracts eigenwert the voltage signal amplifying, and comprises effective value, signal peak and signal power frequency correlative, finally these eigenwerts is presented on display screen.The utility model can the less local discharge signal of determination and analysis, the sensitivity that has improved Partial Discharge Detection.
Description
Technical field
The utility model belongs to High-Voltage Electrical Appliances insulation failure detection field, particularly a kind of analyser that utilizes ultrasonic wave principle to detect GIS apparatus local discharge.
Background technology
Gas insulated combined electrical equipment (Gas Insulated Switchgear, GIS) have that insulativity is high, compact conformation, floor area are little, wide adaptability, feature that reliability is high, in the generating plant of electric system at home and abroad at present and high voltage substation, be widely used.But.In the manufacture and assembling process of GIS, because the problem GIS inside such as technique tend to exist some little defects, as metal particle, insulation air gap etc.These defects may develop into dangerous discharge channel in GIS operational process, and finally cause the apparatus insulated accident of GIS.Shelf depreciation is important sign and the form of expression that insulation fault occurs.Grasp the shelf depreciation situation that device interior exists, and locate the position that shelf depreciation occurs, just can guarantee to have the enough reaction time, power equipment is done to effective prediction and maintenance.
Supercritical ultrasonics technology and ultrahigh frequency method are the methods that order first two more effectively detects GIS apparatus local discharge situation.These two kinds respectively have relative merits.Ultrahigh frequency method is to utilize the method that the ultrahigh frequency electromagnetic signal of sending in shelf depreciation process is carried out Partial Discharge Detection that detects.Its major advantage is highly sensitive, and can to discharge source, accurately locate to the mistiming of different sensors by discharge source.It is applicable to equipment to carry out long-continued monitoring, need producer when device fabrication built-in sensing coupling mechanism to guarantee measuring accuracy; If carry out Site Detection in GIS outside, be very easily subject to the interference of extraneous various electromagnetic signals.Supercritical ultrasonics technology is to utilize the method that the ultrasonic signal sending in shelf depreciation process carries out Partial Discharge Detection that detects.Its major advantage is that equipment is easy to use, can, by the point-to-point measurement of equipment is carried out to defect location, be more suitable for band electro-detection at the scene.
Ultrasound wave Partial discharge detector, generally catches by ultrasonic sensor the ultrasonic signal that discharge process occurs, then through amplification, the filtering of signal, adjust and peak value detection and the frequency detecting of signal, finally show and store data.GIS device structure is complicated, and ultrasound wave route of transmission is within it very complicated, has stronger acoustic attenuation.In addition, when shelf depreciation is implemented to ultrasound examination, on-the-spot Noise and Interference is very strong, and as the Barkhausen noise of mechanical vibration noise, transformer core and Electromagnetic Interference etc. all exist, they even can flood the ultrasonic signal of shelf depreciation.Thereby ultrasound wave Partial discharge detector the very high ultrasonic sensor of sensitivity, also must have extremely highly sensitive prime amplifier except needing.
Utility model content
Therefore, fundamental purpose of the present utility model is to provide a kind of ultrasound wave Analysis of Partial Discharge instrument, can the ultrasonic signal that electric discharge produces occur express-analysis mensurated gas composition insulation in combined electric appliance, to find GIS potential safety hazard and to get rid of in time.
The ultrasound wave Analysis of Partial Discharge instrument that the utility model provides, is characterized in that comprising ultrasonic sensor, signal analysis amplifier, signal processor and Signal Monitor;
Described ultrasonic sensor is used for receiving the ultrasonic signal of local discharge generation, and is converted into electric signal output;
Described signal amplifier carries out the preposition amplification of signal and filtering by the electric signal of acceptance.Mainly comprise the following steps: first the signal of reception is carried out to elementary amplification by charge amplifier; Then by voltage amplifier, carry out twice level and amplify, and by Hi-pass filter, filter low frequency and high-frequency signal simultaneously, and then by voltage amplifier, amplify input signal processor.
Described signal processor carries out time-domain and frequency-domain analysis and extracts eigenwert signal, and described Signal Monitor comprises that by the eigenwert of signal effective value, signal peak and signal power frequency correlative are presented on display screen.
Compare with existing ultrasonic partial discharge instrument, the ultrasound wave Analysis of Partial Discharge instrument that the utility model provides, the ultrasonic signal that ultrasonic sensor is obtained carries out multistage amplification and filtering, has improved the sensitivity detecting, and for some less shelf depreciations, also can measure exactly.
Accompanying drawing explanation
The structural representation of the ultrasound wave Analysis of Partial Discharge instrument that Fig. 1 provides for the utility model;
Fig. 2 is the principle schematic of the utility model signal amplifier;
Fig. 3 is the circuit diagram of the preposition charge amplifier of the utility model;
Fig. 4 is the single voltage amplification filtering circuit of the utility model schematic diagram.
Embodiment
The content that those skilled in the art can be disclosed by this explanation is understood feature and advantage of the present utility model.The utility model also can be implemented and be applied by other different instantiation.
Embodiment 1: as shown in Figure 1, the structural representation of the partial discharge ultrasonic wave detection device providing for the utility model, as shown in the figure, partial discharge ultrasonic wave detection device of the present utility model comprises 4 parts: ultrasonic sensor, signal amplifier and signal processor and Signal Monitor.Ultrasonic sensor is for received ultrasonic signal, and is converted into electric signal and outputs to signal amplifier; Signal amplifier carries out multistage amplification and filtering by electric signal, outputs to signal processor; The eigenwert that signal processor carries out time-domain and frequency-domain analysis to the signal receiving and extracts signal comprises effective value, signal peak and the signal power frequency correlative of signal; Signal Monitor is presented at the eigenwert of extraction on display screen.
Example 2: Fig. 2 is a specific embodiment of signal amplifier, and signal amplifier is comprised of preposition charge amplifier, two-stage voltage amplifier 1, quadravalence Hi-pass filter and voltage amplifier 2.The voltage signal of being exported by ultrasonic sensor is generally very little, first by charge amplifier, the signal of input is carried out to elementary amplification, elementary amplifying signal carries out twice level by voltage amplifier 1 again and amplifies, through filter out lower than 85KHz with higher than the signal of 310KHz by Hi-pass filter simultaneously, then filtered signal is carried out to last signal by voltage amplifier 2 and amplify, output to signal processor.
Because ultrasonic sensor is the Charge Source of a high internal resistance, need carry out signal amplification with the amplifier with high input impedance.Charge amplifier can become the charge conversion of high internal resistance the voltage signal of low internal resistance.Fig. 3 is the circuit diagram of charge amplifier in this example.For guaranteeing good direct current negative feedback, must selecting high input impedance amplifier, require to there is very low bias current simultaneously, low input noise, special requirement have low input noise electric current.General amplifier is selected the operational amplifier of FET input stage, as AD8620.Because the amplifier end of oppisite phase of charge amplifier is connected with sensor, cable and feedback network, the defeated people's impedance of their internal impedance and amplifier is all high impedances, thereby is very easily subject to the interference of external electrical field.When the gain of rear class amplifying circuit is very high, the stray capacitance of space electric capacity also likely makes to measure amplification system vibration.When Testing of Feeble Signals, from the interference of power frequency electric field, make to measure and be difficult to carry out.In equivalent resistance and the equivalent capacity of inverting input input end in parallel, ground connection is carried out strict electrostatic screening protection in addition for this reason.By the setting to feedback resistance and feedback capacity, low-frequency noise and interference are done to preliminary filtering simultaneously.Fig. 4 is the circuit diagram of 1 voltage amplifier in the present embodiment.For obtaining best noiseproof feature, must, according to the requirement of noise matching, select the OP amplifier of the FET input of high input impedance.By the series connection of 2 amplifiers, the signal of charge amplifier input is carried out to twice amplification, twice amplification is 10 times, comprises that 1 homophase amplifies and 1 anti-phase amplification, passes through C simultaneously
3and R
1form band and lead to the bandpass filter for 85-310KHz.
Claims (2)
1. a ultrasound wave Analysis of Partial Discharge instrument, is characterized in that comprising ultrasonic sensor, signal analysis amplifier, signal processor and Signal Monitor; Described ultrasonic sensor is used for receiving the ultrasonic signal of local discharge generation, and is converted into electric signal output; Described signal amplifier carries out signal amplification and filtering by the electric signal of acceptance; Described signal processor carries out time-domain and frequency-domain analysis and extracts eigenwert signal, and described Signal Monitor comprises that by the eigenwert of signal effective value, signal peak and signal power frequency correlative are presented on display screen.
2. ultrasound wave Analysis of Partial Discharge instrument as claimed in claim 1, it is characterized in that described signal amplifier, first the signal of reception is carried out to elementary amplification by charge amplifier, then by voltage amplifier, carry out secondary amplification, through twice amplifying signal, by Hi-pass filter, filter low frequency and high-frequency signal, and then by voltage amplifier, amplify input signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420114380.7U CN203929971U (en) | 2014-03-11 | 2014-03-11 | Ultrasound wave Analysis of Partial Discharge instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420114380.7U CN203929971U (en) | 2014-03-11 | 2014-03-11 | Ultrasound wave Analysis of Partial Discharge instrument |
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| Publication Number | Publication Date |
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| CN203929971U true CN203929971U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420114380.7U Expired - Fee Related CN203929971U (en) | 2014-03-11 | 2014-03-11 | Ultrasound wave Analysis of Partial Discharge instrument |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749501A (en) * | 2015-03-20 | 2015-07-01 | 国家电网公司 | Ultrasonic wave partial discharge analyzer and analyzing method |
| CN107063980A (en) * | 2016-11-02 | 2017-08-18 | 北京信息科技大学 | A kind of flow cytometer scatters optical detection device |
-
2014
- 2014-03-11 CN CN201420114380.7U patent/CN203929971U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749501A (en) * | 2015-03-20 | 2015-07-01 | 国家电网公司 | Ultrasonic wave partial discharge analyzer and analyzing method |
| CN107063980A (en) * | 2016-11-02 | 2017-08-18 | 北京信息科技大学 | A kind of flow cytometer scatters optical detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| DD01 | Delivery of document by public notice |
Addressee: Zhang Xiao Document name: Notification of Acceptance of Patent Application |
|
| DD01 | Delivery of document by public notice |
Addressee: Beijing Sintai Xuecheng Instruments Co., Ltd. Document name: Notification to Go Through Formalities of Registration |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20150311 |
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| EXPY | Termination of patent right or utility model |