CN102981110A - Data measurement and storage system and method for achieving high frequency and ultra-high frequency partial discharge monitoring of transformer - Google Patents

Data measurement and storage system and method for achieving high frequency and ultra-high frequency partial discharge monitoring of transformer Download PDF

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Publication number
CN102981110A
CN102981110A CN2012105344548A CN201210534454A CN102981110A CN 102981110 A CN102981110 A CN 102981110A CN 2012105344548 A CN2012105344548 A CN 2012105344548A CN 201210534454 A CN201210534454 A CN 201210534454A CN 102981110 A CN102981110 A CN 102981110A
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China
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signal
data
frequency
amplifier
output terminal
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CN2012105344548A
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王天正
俞华
李艳鹏
张海
刘永鑫
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
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Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
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Priority to CN2012105344548A priority Critical patent/CN102981110A/en
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Abstract

The invention discloses a data measurement and storage system and method for achieving high frequency and ultra-high frequency partial discharge monitoring of a transformer. The system comprises a data collection unit, a data measurement unit and a data storage unit, wherein the data collection unit is used for collecting high frequency partial discharge signals and ultra-high frequency partial discharge signals; the data measurement unit is used for measuring data at a signal output end of the data collection unit to obtain characteristic values of signals reflecting a failure; and the data storage unit is used for storing the data at a signal output end of the data measurement unit, and displays a failure result. The data measurement storage system and method have the advantages that the available primary measures for the partial discharge monitoring are integrated; the seamless switch of various testing methods is achieved; difficulties such as testing blind areas, complicated partial discharge and external interference that a single partial discharge monitoring method encounters are overcome; the system is simpler in electrical structure, excellent in anti-interference property and good in testing repeatability; and the accuracy and the stability of partial discharge identification and location are reflected very well.

Description

Monitoring Data measurement storage system and method are put in realization transformer high frequency ultrahigh frequency office
Technical field
The invention belongs to the power technology field, be specifically related to a kind of transformer high frequency ultrahigh frequency office that realizes and put DATA REASONING storage system and the method for monitoring.
Background technology
The electrical equipments such as power transformer are subjected to the factor affecting such as temperature, thunderbolt, superpotential, self-heating when long-time running, insulation can be progressively aging, shelf depreciation is electric power transformer insulated deteriorated major reason, it mainly is because Electric Field Distribution is uneven, internal field is too high, causes electrical discharge or punch-through in the subrange in the insulating medium.This discharge only is present in the local location of insulation, can not form immediately whole insulation connectivity and puncture or flashover.As untimely shelf depreciation is effectively monitored, cause apparatus insulated puncture thereby will progressively enlarge, cause serious accident.
The each time generation of shelf depreciation all is attended by a very steep current impulse, and to its ambient radiation electromagnetic wave, the dielectric strength of transformer oil diaphragm structure is higher, therefore the shelf depreciation in the transformer can the very high-frequency electromagnetic wave of radiation, a large amount of practical study shows the non-constant width of the frequency spectrum of shelf depreciation, approximately from hundreds of Hz to thousands of MHz.The test philosophy that detection method is put in high frequency of the prior art office generally is by the preventing local electric signal on the ground wire of high frequency CT coupling transformer, be input to detecting instrument, amplify and the signal processing through signal, on detecting instrument, show in real time and storage, and the acceptance test person analyzes.
In addition, also occur ultrahigh frequency office in the prior art and put detection, it mainly is can produce the electromagnetic wave that flows at device housings according to the shelf depreciation in the equipment, make on the ground wire or the sleeve pipe place produces the high-frequency discharge pulse current and flows through, thereby cause shell to present over the ground HF voltage and spatial towards periphery, (300~3000MHZ) electric signal just can be realized the detection and location of shelf depreciation by ultrahigh frequency that the inner shelf depreciation of measuring transformer produces.
Although above-mentioned prior art has adopted different detection meanss, but because shelf depreciation is as a kind of very complicated electric discharge phenomena, may comprise surface-discharge on conductor tip in gas or the liquid or the discharge on the corner angle, the different insulative material interface or the bubble electric discharge in gliding spark discharge, solid or the liquid insulating material, tree dsicharge in the solid insulating material etc.Therefore, its remarkable shortcoming of bringing is: first, the discharge characteristic of various shelf depreciations is not quite similar, and the susceptibility of each method of testing is also had difference, utilizes merely a kind of detection method of shelf depreciation not necessarily shelf depreciation accurately can be identified and located; Second, even if simple integrated above-mentioned prior art is in an equipment, also will directly cause the bulky of equipment, weight is large and be not easy to carry, complex interfaces, the test wiring is in disorder, and interference free performance is poor, and the arithmetic speed of system, capacity, stability etc. require the aspect also will face test.
Summary of the invention
In view of this, the object of the present invention is to provide realization transformer high frequency ultrahigh frequency office to put the DATA REASONING storage system of monitoring, it can significantly improve the efficient of shelf depreciation identification and location, the electromagnetic interference (EMI) that effective filtering and test site are irrelevant, thus save test duration and cost.
For achieving the above object, technical scheme of the present invention is achieved in that a kind of transformer high frequency ultrahigh frequency office that realizes puts the DATA REASONING storage system of monitoring, it is characterized in that, comprising: the data acquisition unit that is used for gathering high frequency partial discharge signal and high-frequency local discharging signal; Be used for the data of the signal output part of data collecting unit are measured, with the DATA REASONING unit of the eigenwert of the signal that obtains faults; And be used for the data of the signal output part of DATA REASONING unit are stored, and show the data storage cell of fail result.
Described data acquisition unit comprises: HF current transformer and uhf sensor; Described HF current transformer connects prime amplifier, and the signal of described HF current transformer collection inputs to prime amplifier, and prime amplifier connects input selector, and the signal of uhf sensor collection inputs to input selector; The output terminal of described input selector connects wave filter, and the output terminal of described wave filter connects the first amplifier.
The bandpass filter of described wave filter for being consisted of by one group of low-pass filter and Hi-pass filter.
Described DATA REASONING unit comprises: the RMS to DC module that connects the output terminal of the first amplifier; The output terminal tie geophone of described the first amplifier; The output terminal of described wave detector connects smoothing circuit; The output terminal of described smoothing circuit connects the envelope generator; The output terminal of described envelope generator connects loudspeaker, peak detctor, frequency component metering circuit, and the impulsive measurement trigger circuit.
Described peak detctor comprises: for first peak detctor of in the time is opened the door in pulse, working, and for the second peak detctor in 25ms or 75ms work.
Described data storage cell comprises: cache module, the input end of this module connect described peak detctor, frequency component metering circuit, and the output terminal of impulsive measurement trigger circuit; The output terminal of described cache module connects display module and storage control module; Described storage control module is connected with serial line interface and storer.
Further, the invention provides a kind of transformer high frequency ultrahigh frequency office that realizes and put the DATA REASONING storage means of monitoring, it is characterized in that, comprising: step 1, data acquisition unit gathers high frequency partial discharge signal and high-frequency local discharging signal; Step 2, the DATA REASONING unit is measured the data of the signal output part of data collecting unit, with the eigenwert of the signal that obtains faults; Step 3, data storage cell is stored the data of the signal output part of DATA REASONING unit, and shows fail result.
Described step 1 specifically comprises: a. prime amplifier amplifies in advance to the signal that gathers; B. wave filter carries out filtering to the signal of prime amplifier output, to remove low frequency and high frequency noise; C. the first amplifier is led amplification to the signal of wave filter output.
Described step 2 specifically comprises: d. RMS to DC module is extracted signal from the output terminal of the first amplifier, and measures effective value; E. the output signal of the first amplifier is carried out the detection processing through wave detector; F. the output signal of wave detector is through smoothing circuit, to get rid of the peak frequency of signal; G. the envelope generator produces the signal of track smoothing circuit output, and is input to loudspeaker, peak detctor, frequency component metering circuit, and the impulsive measurement trigger circuit, to obtain corresponding eigenwert.
The present invention has following beneficial effect with respect to prior art:
Combine the Main Means of existing partial discharge monitoring, realize the seamless switching of various method of testings, what overcome that single office puts that monitoring method meets with puts and the difficulty such as external interference such as test blind area, complicated office, and, the electrical structure of this system is comparatively simple, interference free performance is excellent, and test repeatability is good, and accuracy and the stability of shelf depreciation identification and location have all obtained good embodiment.
Description of drawings
Fig. 1 is that the structure principle chart of the DATA REASONING storage system of monitoring is put in realization transformer high frequency ultrahigh frequency of the present invention office;
Fig. 2 is the structural representation of the specific embodiment of system shown in Figure 1;
Fig. 3 is a kind of physical circuit figure of RMS to DC device embodiment illustrated in fig. 2;
Fig. 4 is a kind of physical circuit figure of wave detector embodiment illustrated in fig. 2;
Fig. 5 is a kind of physical circuit figure of smoothing circuit embodiment illustrated in fig. 2;
Fig. 6 is a kind of physical circuit figure of frequency component metering circuit embodiment illustrated in fig. 2;
Fig. 7 is a kind of physical circuit figure of impulsive measurement trigger circuit embodiment illustrated in fig. 2;
Fig. 8 is the structural representation of data storage cell embodiment illustrated in fig. 2;
Fig. 9 is that the process flow diagram of the DATA REASONING storage means of monitoring is put in realization transformer high frequency ultrahigh frequency of the present invention office.
Embodiment
For the ease of the further understanding to invention, below in conjunction with accompanying drawing the specific embodiment of the present invention is done further detailed description.
As shown in Figure 1, the realization transformer high frequency ultrahigh frequency of the present invention office DATA REASONING storage system of putting monitoring comprises: the data acquisition unit 110 that is used for gathering high frequency partial discharge signal and high-frequency local discharging signal; Be used for the data of the signal output part of data collecting unit 110 are measured, with the DATA REASONING unit 150 of the eigenwert of the signal that obtains faults; And be used for the data of the signal output part of DATA REASONING unit 150 are stored, and show the data storage cell 190 of fail result.
Fig. 2 is the structural representation of the specific embodiment of system shown in Figure 1, and as shown in the figure, described data acquisition unit 110 comprises: HF current transformer and uhf sensor (not shown); The signal of described HF current transformer collection inputs to prime amplifier 113, and prime amplifier 113 connects input selector 114, and the signal of uhf sensor collection inputs to input selector 114; The output terminal of described input selector 114 connects wave filter 115, and the output terminal of described wave filter 115 connects the first amplifier 116.As specific embodiment, amplifier chip can adopt AD825.
As specific embodiment, described HF current transformer and uhf sensor are arranged on transformer case, bushing and/or the ground wire.The frequency band of described HF current transformer is 100KHz~10MHz, and the frequency band of described uhf sensor is 200 MHz~800MHz.
The bandpass filter of described wave filter 115 for being consisted of by one group of low-pass filter and Hi-pass filter, the ultrasonic signal of generation is put because need to outwards propagate by insulation course in office, consider the complicacy of cable accessory structure and the situation of acoustic attenuation, at first, the signal demand that collects prevents greatly by prime amplifier 113, as specific embodiment, the gain amplifier of prime amplifier 113 is less than or equal to 100dB, signal after the amplification carries out signal filtering by wave filter 115, the purpose of filtering is to remove low frequency and high frequency noise, and wave filter also can be used to analytic signal.
Described DATA REASONING unit 150 comprises: the RMS to DC module 151 that connects the output terminal of the first amplifier 116, the first amplifier 116 is used for signal is led amplification, as specific embodiment, gain amplifier is less than or equal to 3000 dB, and the measurement of effective value is carried out from the first amplifier 116 output extraction signals and by RMS to DC module 151.
The output terminal tie geophone 152 of described the first amplifier 116; The output terminal of described wave detector 152 connects smoothing circuit 153; Smoothing circuit 153 is a kind of arithmetic mean generators, if level and smooth high, then the result is the arithmetic mean of input signal.The smothing filtering of signal has been clipped some highest frequencies of signal, and the spike of signal is taken down, the noise of amplifier for example, during smothing filtering time constant 1 μ s, can elimination 1MHz with upper frequency.
The output terminal of described smoothing circuit 153 connects envelope generator 154; The output terminal of described envelope generator 154 connects loudspeaker 155, peak detctor 156, frequency component metering circuit 157, and impulsive measurement trigger circuit 158.Envelope generator 154 produces the signal at track smoothing circuit 153 output signal tops, the in time constant decay of this signal, and time constant directly affects the measurement of envelope frequency component.
The signal work of peak detctor 156 usefulness envelopes in specific embodiment, can be adopted two identical peak detctors.Work in the time is opened the door in pulse for one, for detection of amplitude and the phase diagram of envelope, another is measured at 25ms or 75 ms, in order to obtain the cycle peak value of continuous coverage mode.
The physical circuit form of peak detctor 156 for example can comprise: adopting model is two audio operational amplifiers compositions of AD847, the in the same way input end of one of them amplifier connects the output terminal of envelope generator, reverse input end connects two resistance, output terminal connects diode, the reverse input end of another amplifier and output terminal contact resistance, input end connects diode in the same way.
In the system architecture shown in Figure 2, envelope is the basis that signal is further analyzed, frequency content and the peak value of signal are obtained by envelope, arrive the signal of loudspeaker 155 also from envelope generator 154, at last, impulsive measurement trigger circuit 158 also adopt the output signal of envelope generator 154.
Fig. 3 is a kind of physical circuit figure of RMS to DC device embodiment illustrated in fig. 2, as shown in the figure, the p1 pin of IC1 connects an end of capacitor C 2 and an end of resistance R 11, COM pin and the UTO pin of the other end of C2 and IC1 join, the other end of R11 connects the d1 pin of U2, one end of RMSut pin and capacitor C 3, the other end of C3 is connected with the Cav pin of IC1, the end of the p0 pin contact resistance R15 of IC1, the other end of R15 connects an end of capacitor C 5, the end of the other end contact resistance R13 of C5, the other end of R13 connects capacitor C 7, and the VIN pin of the other end of C7 and IC1 joins, signal is output as the effective value direct current signal by this RMS to DC device.
As specific embodiment, IC1 can adopt AD637, and this chip provides the crest factor compensation scheme, allows the crest factor measurement signal to be up to 10, and extra error is less than 1%.Bandwidth allows to measure 200 mV root mean square, frequency is up to the input signal of 600 kHz and the input signal that 1 V root mean square is above, frequency is up to 8 MHz.
Fig. 4 is a kind of physical circuit figure of wave detector embodiment illustrated in fig. 2, as shown in the figure, the end of the reverse input end contact resistance R21 of amplifier U1, the other end of R21 connects the positive pole of diode D11 and an end of resistance R 23, the negative pole of D11 connects the output terminal of U1 and the positive pole of diode D12, the in the same way input end of U2 connects the negative pole of diode D12 and an end of resistance R 24, the other end ground connection of R24, the other end of the reverse input end contact resistance R23 of U2 and an end of resistance R 25, the other end of R25 is connected with the output terminal of U2.In the specific embodiment, diode D11 and D12 can adopt IN4148.
Fig. 5 is a kind of physical circuit figure of smoothing circuit embodiment illustrated in fig. 2, as shown in the figure, an end of resistance R 31 is signal input part, and the other end of R31 connects an end of capacitor C 22, the other end ground connection of C22, resistance R 31 and capacitor C 22 form a resistance capacity filter signal are carried out smoothing processing.
Fig. 6 is a kind of physical circuit figure of frequency component metering circuit embodiment illustrated in fig. 2, as shown in the figure, the simple connection civil power of transformer, the end of secondary contact resistance R51 and R52, the IN-pin contact resistance R51 of IC2 and the other end of R52, the end of OUT pin contact resistance R53 and an end of capacitor C 34, the end of the other end contact resistance R55 of capacitor C 34, the other end that the other end of R55 is connected with capacitor C connects not gate.As specific embodiment, IC2 can adopt LM311N.
Fig. 7 is a kind of physical circuit figure of impulsive measurement trigger circuit embodiment illustrated in fig. 2, as shown in the figure, in the same way input end IN+ pin contact resistance R71 and the R72 of IC3, reverse input end IN-pin connects the output terminal of envelope generator 154.As specific embodiment, IC3 can adopt LM311N.
Fig. 8 is the concrete structure synoptic diagram of data storage cell embodiment illustrated in fig. 2, as shown in the figure, described data storage cell 190 comprises: cache module 191, the input end of this module connects described peak detctor 156, frequency component metering circuit 157, and the output terminal of impulsive measurement trigger circuit 158; The output terminal of described cache module 191 connects display module 193 and storage control module 194; Described storage control module 194 is connected with serial line interface 197 and storer 198.
Fig. 9 has illustrated realization transformer high frequency ultrahigh frequency of the present invention office to put the DATA REASONING storage means of monitoring, as shown in the figure, comprising: step S110, and data acquisition unit 110 gathers high frequency partial discharge signal and high-frequency local discharging signals; Step S150, the data of the signal output part of the 150 pairs of data collecting units 110 in DATA REASONING unit are measured, with the eigenwert of the signal that obtains faults; Step S190, data storage cell 190 is stored the data of the signal output part of DATA REASONING unit 150, and shows fail result.
Described step 1 specifically comprises: the signal of 113 pairs of collections of a. prime amplifier amplifies in advance; B. the signal of 115 pairs of prime amplifiers of wave filter, 113 outputs carries out filtering, to remove low frequency and high frequency noise; C. the signal of 116 pairs of wave filter outputs of the first amplifier is led amplification.
Described step 2 specifically comprises: d. RMS to DC module 151 is extracted signal from the output terminal of the first amplifier 116, and measures effective value; E. the output signal of the first amplifier 116 is carried out the detection processing through wave detector 152; F. the output signal of wave detector 152 is through smoothing circuit 153, to get rid of the peak frequency of signal; G. envelope generator 154 produces the signal of track smoothing circuit 153 outputs, and is input to loudspeaker 155, peak detctor 156, frequency component metering circuit 157, and impulsive measurement trigger circuit 158, to obtain corresponding eigenwert.
Experiment effect is for example: the present invention is applied in the middle of the experiment of tag simulated defect, and its measurement sensitivity can satisfy field requirement, and can be in time, discovery cable end inherent vice early.The integrated combination of partial discharge monitoring means is so that the partial discharges fault location is simpler, quick, efficient.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.

Claims (10)

1. realize that transformer high frequency ultrahigh frequency office puts the DATA REASONING storage system of monitoring for one kind, it is characterized in that, comprising:
Be used for gathering the data acquisition unit of high frequency partial discharge signal and high-frequency local discharging signal;
Be used for the data of the signal output part of data collecting unit are measured, with the DATA REASONING unit of the eigenwert of the signal that obtains faults; And
Be used for the data of the signal output part of DATA REASONING unit are stored, and show the data storage cell of fail result.
2. system according to claim 1 is characterized in that, described data acquisition unit comprises: HF current transformer and uhf sensor;
The signal of described HF current transformer collection inputs to prime amplifier, and prime amplifier connects input selector, and the signal of uhf sensor collection inputs to input selector;
The output terminal of described input selector connects wave filter, and the output terminal of described wave filter connects the first amplifier.
3. system according to claim 2 is characterized in that, the bandpass filter of described wave filter for being made of one group of low-pass filter and Hi-pass filter.
4. according to claim 1,2,3 described systems, it is characterized in that described DATA REASONING unit comprises:
The RMS to DC module that connects the output terminal of the first amplifier;
The output terminal tie geophone of described the first amplifier;
The output terminal of described wave detector connects smoothing circuit;
The output terminal of described smoothing circuit connects the envelope generator;
The output terminal of described envelope generator connects loudspeaker, peak detctor, frequency component metering circuit, and the impulsive measurement trigger circuit.
5. system according to claim 4 is characterized in that, described peak detctor comprises: for first peak detctor of in the time is opened the door in pulse, working, and for the second peak detctor in 25ms or 75ms work.
6. system according to claim 5 is characterized in that, described data storage cell comprises:
Cache module, the input end of this module connect described peak detctor, frequency component metering circuit, and the output terminal of impulsive measurement trigger circuit;
The output terminal of described cache module connects display module and storage control module;
Described storage control module is connected with serial line interface and storer.
7. realize that transformer high frequency ultrahigh frequency office puts the DATA REASONING storage means of monitoring for one kind, it is characterized in that, comprising:
Step 1, data acquisition unit gathers high frequency partial discharge signal and high-frequency local discharging signal;
Step 2, the DATA REASONING unit is measured the data of the signal output part of data collecting unit, with the eigenwert of the signal that obtains faults;
Step 3, data storage cell is stored the data of the signal output part of DATA REASONING unit, and shows fail result.
8. method according to claim 7 is characterized in that, described step 1 specifically comprises:
A. prime amplifier amplifies in advance to the signal that gathers;
B. wave filter carries out filtering to the signal of prime amplifier output, to remove low frequency and high frequency noise;
C. the first amplifier is led amplification to the signal of wave filter output.
9. method according to claim 8 is characterized in that, described step 2 specifically comprises:
D. the RMS to DC module is extracted signal from the output terminal of the first amplifier, and measures effective value;
E. the output signal of the first amplifier is carried out the detection processing through wave detector;
F. the output signal of wave detector is through smoothing circuit, to get rid of the peak frequency of signal;
G. the envelope generator produces the signal of track smoothing circuit output, and is input to loudspeaker, peak detctor, frequency component metering circuit, and the impulsive measurement trigger circuit, to obtain corresponding eigenwert.
10. method according to claim 8 is characterized in that:
The gain that described prime amplifier amplifies in advance is less than or equal to 100dB;
Described the first amplifier is led the gain of amplification less than or equal to 3000dB.
CN2012105344548A 2012-12-12 2012-12-12 Data measurement and storage system and method for achieving high frequency and ultra-high frequency partial discharge monitoring of transformer Pending CN102981110A (en)

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CN105606970A (en) * 2016-02-02 2016-05-25 合肥工业大学智能制造技术研究院 Ultra high frequency partial discharge online monitoring system based on spatial filtering method
CN106845131A (en) * 2017-02-14 2017-06-13 吴笃贵 A kind of local discharge characteristic parameter extracting method based on Recursive Filter Algorithm Using
CN108680843A (en) * 2018-08-21 2018-10-19 广西电网有限责任公司电力科学研究院 A kind of method for detection of partial discharge of switch cabinet based on Radio Transmission Technology
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CN109975668A (en) * 2019-03-27 2019-07-05 国网上海市电力公司 Using the average shelf depreciation ultrasonic wave peak-value detection method of broad sense time-frequency domain
CN110320059A (en) * 2019-06-21 2019-10-11 国网山西省电力公司电力科学研究院 Transformer oil pump longtime running assesses device and appraisal procedure

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CN105606970A (en) * 2016-02-02 2016-05-25 合肥工业大学智能制造技术研究院 Ultra high frequency partial discharge online monitoring system based on spatial filtering method
CN106845131A (en) * 2017-02-14 2017-06-13 吴笃贵 A kind of local discharge characteristic parameter extracting method based on Recursive Filter Algorithm Using
CN106845131B (en) * 2017-02-14 2019-03-26 吴笃贵 A kind of local discharge characteristic parameter extracting method based on Recursive Filter Algorithm Using
CN108919070A (en) * 2018-06-07 2018-11-30 广西电网有限责任公司电力科学研究院 A kind of partial discharge of switchgear detection system of Multi-source Information Fusion
CN108919069A (en) * 2018-06-07 2018-11-30 广西电网有限责任公司电力科学研究院 A kind of method for detection of partial discharge of switch cabinet of Multi-source Information Fusion
CN108680843A (en) * 2018-08-21 2018-10-19 广西电网有限责任公司电力科学研究院 A kind of method for detection of partial discharge of switch cabinet based on Radio Transmission Technology
CN108710074A (en) * 2018-08-21 2018-10-26 广西电网有限责任公司电力科学研究院 A kind of partial discharge of switchgear detecting system based on Radio Transmission Technology
CN109975668A (en) * 2019-03-27 2019-07-05 国网上海市电力公司 Using the average shelf depreciation ultrasonic wave peak-value detection method of broad sense time-frequency domain
CN110320059A (en) * 2019-06-21 2019-10-11 国网山西省电力公司电力科学研究院 Transformer oil pump longtime running assesses device and appraisal procedure

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