CN206531923U - Embedded partial discharge monitoring intelligence instrument based on pulse current method - Google Patents
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- CN206531923U CN206531923U CN201720132796.5U CN201720132796U CN206531923U CN 206531923 U CN206531923 U CN 206531923U CN 201720132796 U CN201720132796 U CN 201720132796U CN 206531923 U CN206531923 U CN 206531923U
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Abstract
Embedded partial discharge monitoring intelligence instrument based on pulse current method, powered by power circuit, intelligence instrument is connected on primary system controller switching equipment by rf signal line, intelligence instrument includes impedance matching circuit, signal conditioning circuit and the cpu circuit for receiving the pulsed current signal of rf signal line collection, the signal input part of signal conditioning circuit is connected with impedance matching circuit, and cpu circuit is connected with the signal output part of signal conditioning circuit.The utility model can monitor controller switching equipment shelf depreciation information on-line, and show the discharge informations such as the probability strength of discharge of shelf depreciation, electric discharge frequency by supporting display, data download can also be carried out by its download interface, data remote etc. is carried out by communication interface, equipment can also be linked into related data system, to give full play to effect of the Condition-Based Maintenance Technology in terms of power supply reliability, Optimal Maintenance strategy, reduction O＆M cost, excavating equipment potential life-span is improved.
Description
Technical field
The utility model is related to Partial Discharge Detection, controller switching equipment partial discharge monitoring field, particularly relates to base
In the embedded partial discharge monitoring intelligence instrument of pulse current method.
Background technology
Most failures of power distribution network all one common phenomenons of association：Shelf depreciation.Science Partial Discharge Detection skill
Art and effective detection means improve power supply reliability and the power system of distribution network systems for timely discovering device operation exception
Economy, safe operation it is significant.
Detection method for local discharge is classified according to the means of realization or the general principle of detection institute foundation, can be divided into
Two kinds of direct method and indirect method.The theoretical foundation of direct method is Circuit theory, and typical application is pulse current method；Office each time
Portion's electric discharge is all with a number of electric charge by dielectric, and this duration very short electric charge moving process is just electric with pulse
The form of stream is showed, and the technology just detected to the electric current of this impulse type by certain means turns into the arteries and veins of direct method
Rush current detection technology.Indirect rule mainly realizes the detection to shelf depreciation by detecting the attendant phenomenon of shelf depreciation,
Such as chemical method, optical method, electromagnetic method, sonic method, heat scan or thermometry.
Current Partial Discharge Detection means are as based on transient earth voltage, ultrasonic wave and infrared thermal imaging scanning technique
Detection is all the Partial Discharge Detecting Technology for belonging to indirect method.The detection technique of indirect method is asked in terms of being primarily present following four
Topic：
1st, detection sensitivity is relatively low.The Partial Discharge Detection of indirect method is based on the research to shelf depreciation attendant phenomenon
The detection technique produced, detects that signal belongs to shelf depreciation companion signal, such as according to Maxwell electromagnetic theories, electric discharge
Pulse can produce the outside radiation signal of electromagnetic signal of high frequency, when shelf depreciation occurs in addition, be often accompanied by the phenomenons such as light, sound, heat
Generation；By above-mentioned radiation signal with light, sound, hot detection, to realize detection, the research to shelf depreciation.But this
It is low or the features such as easily by external interference to there is signal intensity in a little companion signals, so as to cause accuracy in detection and referring to property inclined
It is low.
2nd, domestic controller switching equipment O＆M detection scheme at present is periodicity inspection, according to《Ac metal closing switch gear
Transient earth voltage shelf depreciation live testing technology field application directive/guide（Paper for approval）》Regulation, the status checkout of distribution net equipment
Cycle is generally according to annual 1 ~ 2 time progress.The defect that occurs in the middle of detection cycle and intermittent discharge accident can not quilts in time
It was found that.Therefore, the insulation defect sometime occurred in the middle of inspection activity twice is often slipped.
3rd, limitation of the existing detection device due to can be detected signal band scope, causes status checkout activity presence
" blind area ".The frequency band range of current transient earth voltage detection technique is typically designed to 3MHz ~ 100MHz, and ultrasound examination
Then fixation is designed as 40kHz to frequency band.For the discharge defect of distribution net equipment, then very likely there is electric discharge frequency spectrum and be located at
100kHz ~ 3MHz situation, in this in the case of, existing detection scheme is likely to failure, causes 100kHz ~ 3MHz frequency band models
Shelf depreciation voltage signal detection in enclosing turns into detection " blind area ".
4th, distribution net equipment widely used all-metal enclosed construction, open type switchgear quantity is fewer and fewer.In cabinet
The shelf depreciation companion signal that portion is produced, such as ELECTROMAGNETIC RADIATION SIGNATURE, voice signal during outside transmission due to by
The shielding action of metal cabinet, it is difficult to transmit out, even if transmission comes out, also can greatly be weakened, existing detection device
It is difficult accurate signal acquisition when being detected outside cabinet to signal, causes Detection results undesirable.
Utility model content
For the deficiency of objective reality in current Partial Discharge Detection, the utility model provides a kind of based on pulse current method
Embedded partial discharge monitoring intelligence instrument, its theoretical foundation is classical Circuit theory, and its technological guidance is direct
The Partial Discharge Detecting Technology of method.Pulse current method Partial Discharge Detecting Technology is very ripe, very high with detection sensitivity,
The advantage of discharge capacity calibration is easily carried out, can also accurate reproduction partial discharge pulse when coordinating using high-frequency detection resistance technique
Waveform.Pulse current method belongs to direct method Partial Discharge Detecting Technology category, can obtain more accurate, reliable detection letter
Number.The utility model is designed based on above-mentioned characteristic and advantage, and power supply is being improved reliably to give full play to Condition-Based Maintenance Technology
Property, Optimal Maintenance strategy, reduction O＆M cost, the effect in terms of excavating equipment potential life-span.
To realize above-mentioned technical purpose, the technical scheme used is：Embedded shelf depreciation based on pulse current method
Monitor intelligence instrument on-line, powered by power circuit, intelligence instrument is connected on primary system controller switching equipment by rf signal line,
Intelligence instrument includes：
Impedance matching circuit, receives the 100kHz-5MHz current signals of rf signal line collection, and the electric current collected is believed
Number couple and separated, obtain power current and high frequency partial discharge pulse current, and power current and high frequency partial are put
Electric pulse current is changed into shelf depreciation voltage signal and power-frequency voltage signal by detection impedance；
Signal conditioning circuit, is connected with impedance matching circuit, and it includes power frequency component modulate circuit and local discharge voltage
Signal conditioning circuit, power frequency component modulate circuit includes power frequency bleeder circuit and power frequency follower, and power-frequency voltage signal is through power frequency
Power frequency follower is sent to after bleeder circuit decompression；Shelf depreciation voltage signal conditioning circuit includes gain-programmed amplifier, just
Anti- amplifier, bandpass filter, absolute value peak detecting circuit and partial discharge follower, shelf depreciation voltage signal increase through program control
Beneficial amplifier reduces after gain or increase gain, sequentially passes through positive and negative amplifier, bandpass filter, absolute value peak detecting circuit
Send into partial discharge follower；
Cpu circuit, is connected with signal conditioning circuit, the power-frequency voltage signal of real-time monitoring signals modulate circuit output and
Shelf depreciation voltage signal, display monitoring result.
Gain-programmed amplifier described in the utility model is when detected signal is small-signal, and amplifier improves gain times
Number, it is ensured that the sensitivity of amplifying circuit；When detected signal is big signal, then amplifier reduces gain factor, adaptive big letter
Number so that signal amplifies measurement range of the result without departing from instrument global design.
Positive and negative amplifier described in the utility model, includes an in-phase amplifier and an inverting amplifier；It is same mutually to put
Big device is directed to positive discharge pulse amplification, exports direct impulse signal；Phase inverter is directed to negative discharge pulse amplification, and same output is just
To pulse signal.
Cpu circuit described in the utility model includes enough FLASH program memory spaces and abundant I/O mouthfuls microprocessor,
At a high speed, remote communication interface, USB download circuits, A/D modular converters, LCD touches display, SD card storage.
The utility model beneficial effect is：
1）First, the utility model is using the Partial Discharge Detecting Technology of direct method as theoretical foundation, using pulse current method
Detection method for local discharge, directly detect in controller switching equipment or produce in power system using annexation electrically
Discharge pulse current, so as to improve sensitivity and the reliability of detection.
2）Secondly, the embedded partial discharge monitoring intelligence instrument based on pulse current method is characterized in, belonged to
Line monitors class device, impedance matching circuit, signal conditioning circuit, cpu circuit and display cpu circuit is built-in with, installed in distribution
In equipment, state that can continuously, in real time to system is monitored, then the signal detected is calculated, analyzed, is handled,
Record and teletransmission, with continuous capturing discharge fault, find controller switching equipment discharging law, effectively evade institute in periodicity inspection activity
The missing inspection problem brought, improves O＆M quality.
3）In addition, the embedded partial discharge monitoring intelligence instrument based on pulse current method, is characterized in, according to electricity
Road principle design goes out the signal deteching circuit that detection bandwidth is 100kHz-5MHz, can be in effective detection 100k-5MHz frequency band ranges
Shelf depreciation voltage signal；100kHz ~ 3MHz the detections for solving existing sound-electric-heat integration detection technique presence are " blind
Area " problem.
4）Embedded partial discharge monitoring intelligence instrument based on pulse current method, employs embedded installation side
Device, is connected in power system by formula using rf signal line, is received signal by the annexation of wire, is efficiently solved
The difficulty that the all-metal enclosed construction of controller switching equipment is caused to signal detection；
5）The sensitivity of Partial Discharge Detection is improved, the detection " blind area " of existing detection device has been cleared away, has evaded week
Detection leakage phenomenon in phase inspection, overcomes the signal detection difficult problem that metal-enclosed type controller switching equipment is brought；With data point
The functions such as analysis, record and unofficial biography, can constitute system and collect big data, carry out statistical analysis, be the economy of all kinds of electric companies
Property analysis, risk assessment and asset management analysis etc. science operation means provide data foundation, be conducive to setting up expert system, subtract
Skinny device O＆M cost, reduces investment risk, improves operation benefits.
Brief description of the drawings
Fig. 1 is direct method Partial Discharge Detection principle schematic.
Fig. 2 is functional block diagram of the present utility model.
Fig. 3 is the theory diagram of impedance matching circuit of the present utility model.
Fig. 4 is the theory diagram of signal conditioning circuit of the present utility model.
In figure：1st, resistance hole match circuit, 2, signal conditioning circuit, 21, power frequency component modulate circuit, 22, shelf depreciation electricity
Press signal conditioning circuit, 211, power frequency reduction voltage circuit, 212, power frequency follower, 221, gain-programmed amplifier, 222, positive and negative put
Big device, 223, bandpass filter, 224, absolute value peak detecting circuit, 225, partial discharge follower, 226, low pass filter, 3,
Cpu circuit, 4, cpu circuit comprising modules, 5, power circuit, 51, switch power module, 52, low pass filter.
Embodiment
Below in conjunction with accompanying drawing, by describing a more complete embodiment in detail, to be done further to the utility model
Explaination.
Embedded partial discharge monitoring intelligence instrument based on pulse current method, is powered by power circuit, Intelligent Instrument
Table is connected on primary system controller switching equipment by rf signal line, and intelligence instrument includes：
Impedance matching circuit, receives the 100kHz-5MHz current signals of rf signal line collection, and the electric current collected is believed
Number couple and separated, obtain power current and high frequency partial discharge pulse current, and power current and high frequency partial are put
Electric pulse current is changed into shelf depreciation voltage signal and power-frequency voltage signal by detection impedance；
Signal conditioning circuit, is connected with impedance matching circuit, and it includes power frequency component modulate circuit 21 and shelf depreciation letter
Number modulate circuit 22, power frequency component modulate circuit 21 includes power frequency bleeder circuit 211 and power frequency follower 212, power-frequency voltage letter
Number through power frequency bleeder circuit 211 be depressured after be sent to power frequency follower 212；Local discharge signal modulate circuit 22 includes program control increase
Beneficial amplifier 221, positive and negative amplifier 222, bandpass filter 223, absolute value peak detecting circuit 224 and partial discharge follower
225, after shelf depreciation voltage signal reduces gain or increase gain through gain-programmed amplifier 221, sequentially pass through positive and negative amplification
Device 222, bandpass filter 223, the feeding partial discharge of absolute value peak detecting circuit 224 follower 225；
Cpu circuit, is connected with signal conditioning circuit, the power-frequency voltage signal of real-time monitoring signals modulate circuit output and
Shelf depreciation voltage signal, display monitoring result.
Its specific implementation step is as follows：
When having partial discharge phenomenon generation on the first step, the high voltage electric equipment of primary system, it may occur that the migration of electric charge,
A pulse-type current is produced on controller switching equipment metallic conductor, Fig. 1 show direct method Partial Discharge Detection principle schematic.
Second step, shown in Fig. 2, the embedded partial discharge monitoring intelligence instrument based on pulse current method, by penetrating
Frequency signal wire is connected on the high voltage electric equipment of primary system, and the pulse-type current of the first step will be transmitted by rf signal line
To the utility model device, while power current can also be come in by radio frequency line transmission.
3rd step, impedance matching circuitThe current signal received is by impedance matching circuit signal coupling electricity therein
Road couples power current and high frequency partial discharge pulse current, and is separated both using the different characteristic of two kinds of signals；Resistance
Anti- match circuitIn the effect of the current signal that is coupled to again by detection impedance be changed into shelf depreciation voltage signal and power frequency electric
Press signal.
Impedance matching circuitAnd signal conditioning circuitIt is connected.Signal conditioning circuitComprising：Power frequency component modulate circuit
21 and local discharge voltage signal conditioning circuit 22.
4th step, impedance matching circuitResulting power-frequency voltage signal is sent in power frequency component modulate circuit 21
Power frequency reduction voltage circuit 211, shelf depreciation voltage signal is sent to the programme-controlled gain in shelf depreciation voltage signal conditioning circuit 22
Amplifier 221.
For power frequency component：After power frequency reduction voltage circuit 211 handles high-tension power frequency component decompression, it is amplification to be changed into
The signal of device processing, is then sent to power frequency follower 212 by above-mentioned signal.
For shelf depreciation voltage signal：Gain-programmed amplifier 221 amplifies shelf depreciation voltage signal appropriate times
Number；Gain-programmed amplifier 221, when detected signal is small-signal, amplifier 221 improves gain factor, it is ensured that amplification electricity
The sensitivity on road；When detected signal is big signal, then amplifier 221 reduces gain factor, adaptive big signal so that signal
Amplify measurement range of the result without departing from instrument global design.
Gain-programmed amplifier 221 is connected with positive and negative amplifier 222.Positive and negative amplifier 222, comprising one with mutually amplification
Device and an inverting amplifier；In-phase amplifier is directed to positive discharge pulse amplification, exports direct impulse signal；Phase inverter is directed to
Negative discharge pulse amplification, same output direct impulse signal；
Positive and negative amplifier 222 is connected with bandpass filter 223.Bandpass filter 223 is according to shelf depreciation voltage signal
Frequency characteristic design so that the signal for possessing local discharge characteristic passes through, filter out interference and noise signal, to measured letter
Number carry out purified treatment.
Bandpass filter 223 is connected with absolute value peak detecting circuit 224.Absolute value peak detecting circuit 224 has two
Group peak detector, carries out detection processing, and finally take out two-way detection by duration extremely short partial discharge pulse's signal
The maximum of circuit.《Measurement of partial discharge GB/T 7354-2003》4.3.3 chapters and sections are pointed out, " special recommendation indicating instrument and
Recorder is quantified to the maximum partial discharge value repeated ".So manufacturer should will measure " the maximum shelf depreciation value of appearance "
Researched and developed as the Core Feature of Partial Discharge Detection class product.A larger electric discharge letter is not only obtained by detecting circuit
Number, but also down conversion process has been carried out to the discharge signal of the high frequency, reduce the performance to CPU A/D sample conversion links
It is required that.
Absolute value peak detecting circuit 224 is connected with partial discharge follower 225.225 signal isolations of partial discharge follower
Effect, for eliminating influence of the digital sampling circuitry to signal conditioning circuit.
Above-mentioned signal conditioning circuit 2 is connected with cpu circuit.
Above-mentioned cpu circuit, with following characteristics, is mainly included：Enough FLASH program memory spaces and abundant I/O mouthfuls
Microprocessor, high speed, remote communication interface, USB download circuits, A/D modular converters, LCD touches display, SD card storage etc..
5th step, signal acquisition, the power frequency component of the multiplexed signal sampling unit of cpu circuit respectively with signal conditioning circuit
Modulate circuit is exported and the output of local discharge signal modulate circuit is connected；
The signal gathering unit of cpu circuit, is built using high-performance embedded computer system, utilizes high speed, high accuracy
AD converter realizes seizure, the conversion to local discharge signal, and the continuous acquisition to power-frequency voltage and judgement, and by passing
Return characteristic parameter extraction, filtering scheduling algorithm to obtain shelf depreciation situation and the powered result of power frequency, finally the probability of gained discharges
It has been shown that, record, teletransmission or download etc. when intensity, averaged discharge intensity, electric discharge frequency etc. and the fructufy of the powered situation of power frequency；
Above-mentioned all circuits all provide power supply by power circuit, and power circuit 5 is by switch power module 51 and low pass
Wave filter 52 is constituted.
Embedded partial discharge monitoring intelligence instrument based on pulse current method, with data acquisition, data display,
The functions such as data record, data transmission, using the system architecture of layered distribution type, maximum is provided for the asset management of power grid enterprises
Support to limit.
Claims (3)
1. the embedded partial discharge monitoring intelligence instrument based on pulse current method, is powered, its feature exists by power circuit
In：Intelligence instrument is connected on primary system controller switching equipment by rf signal line, and intelligence instrument includes reception rf signal line and adopted
Impedance matching circuit, signal conditioning circuit and the cpu circuit of the 100kHz-5MHz current signals of collection, the letter of signal conditioning circuit
Number input is connected with impedance matching circuit, and signal conditioning circuit includes power frequency component modulate circuit（21）And local discharge signal
Modulate circuit（22）, power frequency component modulate circuit（21）Including power frequency bleeder circuit（211）With power frequency follower（212）, power frequency
Voltage signal is through power frequency bleeder circuit（211）Power frequency follower is sent to after decompression（212）；Local discharge signal modulate circuit
（22）Including gain-programmed amplifier（221）, positive and negative amplifier（222）, bandpass filter（223）, absolute value peak detection electricity
Road（224）And partial discharge follower（225）, shelf depreciation voltage signal is through gain-programmed amplifier（221）Reduce gain or increasing
After large gain, positive and negative amplifier is sequentially passed through（222）, bandpass filter（223）, absolute value peak detecting circuit（224）Feeding
Partial discharge follower（225）；Cpu circuit is connected with the signal output part of signal conditioning circuit.
2. the embedded partial discharge monitoring intelligence instrument as claimed in claim 1 based on pulse current method, its feature
It is：Described positive and negative amplifier（222）, include an amplifier and a sign-changing amplifier in the same direction.
3. the embedded partial discharge monitoring intelligence instrument as claimed in claim 1 based on pulse current method, its feature
It is：Described cpu circuit includes enough FLASH program memory spaces and abundant I/O mouthfuls microprocessor, high-speed remote communication
Interface, USB download circuits, A/D modular converters, LCD touch display, SD card storage.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872869A (en) * | 2017-02-14 | 2017-06-20 | 吴笃贵 | Embedded partial discharge monitoring intelligence instrument based on pulse current method |
| CN108427064A (en) * | 2018-02-07 | 2018-08-21 | 国网陕西省电力公司西安供电公司 | A kind of auxiliary detection device of high-tension switch cabinet local discharge signal |
| CN112595934A (en) * | 2020-10-14 | 2021-04-02 | 浙江大有实业有限公司杭州科技发展分公司 | Method and device for measuring partial discharge signal intensity of high-voltage cable |
| CN115602191A (en) * | 2022-12-12 | 2023-01-13 | 杭州兆华电子股份有限公司（Cn） | Noise elimination method of transformer voiceprint detection system |
-
2017
- 2017-02-14 CN CN201720132796.5U patent/CN206531923U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872869A (en) * | 2017-02-14 | 2017-06-20 | 吴笃贵 | Embedded partial discharge monitoring intelligence instrument based on pulse current method |
| CN108427064A (en) * | 2018-02-07 | 2018-08-21 | 国网陕西省电力公司西安供电公司 | A kind of auxiliary detection device of high-tension switch cabinet local discharge signal |
| CN108427064B (en) * | 2018-02-07 | 2020-05-05 | 国网陕西省电力公司西安供电公司 | Auxiliary detection device for partial discharge signal of high-voltage switch cabinet |
| CN112595934A (en) * | 2020-10-14 | 2021-04-02 | 浙江大有实业有限公司杭州科技发展分公司 | Method and device for measuring partial discharge signal intensity of high-voltage cable |
| CN112595934B (en) * | 2020-10-14 | 2024-05-17 | 浙江大有实业有限公司杭州科技发展分公司 | Method and device for measuring intensity of partial discharge signal of high-voltage cable |
| CN115602191A (en) * | 2022-12-12 | 2023-01-13 | 杭州兆华电子股份有限公司（Cn） | Noise elimination method of transformer voiceprint detection system |
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Address after: Room 2101, No. 33 Shuixian Road, Siming District, Xiamen City, Fujian Province, 361000 Patentee after: Wu Dugui Country or region after: China Patentee after: Dehua Technology (Henan) Co.,Ltd. Address before: 461000, 100 meters west of the intersection of Labor North Road and Hongteng Road in Weidu Industrial Agglomeration Zone, Xuchang City, Henan Province, China. Chronological Science and Technology Industrial Park Patentee before: Wu Dugui Country or region before: China Patentee before: JINIAN TECHNOLOGY CO.,LTD. |
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