CN106872869A - Embedded partial discharge monitoring intelligence instrument based on pulse current method - Google Patents
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- CN106872869A CN106872869A CN201710079391.4A CN201710079391A CN106872869A CN 106872869 A CN106872869 A CN 106872869A CN 201710079391 A CN201710079391 A CN 201710079391A CN 106872869 A CN106872869 A CN 106872869A
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- 238000000034 method Methods 0.000 title claims abstract description 41
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- 230000035945 sensitivity Effects 0.000 claims description 7
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- 210000003462 vein Anatomy 0.000 claims description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- Testing Electric Properties And Detecting Electric Faults (AREA)
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 of the 100kHz 5MHz current signals for receiving 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 present invention is improving the effect of the aspects such as power supply reliability, Optimal Maintenance strategy, reduction O＆M cost, excavating equipment potential life-span to give full play to Condition-Based Maintenance Technology.
Description
Technical field
The present invention relates to Partial Discharge Detection, controller switching equipment partial discharge monitoring field, particularly relate to based on arteries and veins
Rush the embedded partial discharge monitoring intelligence instrument of 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 or the general principle of detection institute foundation realized, 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 belonging to the Partial Discharge Detecting Technology of indirect method.The detection technique of indirect method is primarily present following four aspect and asks
Topic：
1st, detection sensitivity is relatively low.The Partial Discharge Detection of indirect method is to be based on producing the research of shelf depreciation attendant phenomenon
A detection technique, institute's detection signal belongs to shelf depreciation companion signal, such as according to Maxwell electromagnetic theories, discharge pulse
The outside radiation signal of electromagnetic signal of high frequency can be produced, when shelf depreciation occurs in addition, the hair of the phenomenons such as light, sound, heat is often accompanied by
It is raw；Detection, the research to shelf depreciation are realized with light, sound, hot detection by above-mentioned radiation signal.But these companions
It is low or the features such as easily by external interference to there is signal intensity in raw signal, so as to cause accuracy in detection and referring to property relatively low.
2nd, domestic controller switching equipment O＆M detection scheme at present is periodically to patrol and examine, according to《Ac metal closing switch gear
Apply directive/guide in transient earth voltage shelf depreciation live testing technology scene（Paper for approval）》Regulation, the status checkout of distribution net equipment
Cycle is carried out generally according to annual 1 ~ 2 time.The defect occurred in the middle of detection cycle and intermittent discharge accident cannot quilts in time
It was found that.Therefore, the insulation defect sometime occurred in the middle of activity is patrolled and examined twice often to be slipped.
3rd, existing testing equipment causes status checkout activity to exist due to can be detected the limitation of signal band scope
" 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
The situation of 100kHz ~ 3MHz, in this in the case of, existing detection scheme be likely to failure, cause 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 feweri.In cabinet
The shelf depreciation companion signal that portion produces, such as ELECTROMAGNETIC RADIATION SIGNATURE, voice signal are during outwards transmission due to being subject to
The shielding action of metal cabinet, it is difficult to transmit out, even if transmission is out, also can greatly be weakened, existing testing equipment
Accurate signal acquisition is difficult when being detected to signal outside cabinet, causes Detection results undesirable.
The content of the invention
For the deficiency of objective reality in current Partial Discharge Detection, the present invention provides a kind of based in pulse current method
Embedded partial discharge monitoring intelligence instrument, its theoretical foundation is classical Circuit theory, and its technological guidance is direct method
Partial Discharge Detecting Technology.Pulse current method Partial Discharge Detecting Technology is very ripe, very high with detection sensitivity, easily
The advantage of discharge capacity calibration is carried out, can also accurate reproduction partial discharge pulse ripple when coordinating using high-frequency detection resistance technique
Shape.Pulse current method belongs to direct method Partial Discharge Detecting Technology category, can obtain more accurate, reliable detection signal.
The present invention is designed based on above-mentioned characteristic and advantage, and power supply reliability, optimization are being improved to give full play to Condition-Based Maintenance Technology
Strategies of Maintenance, the effect for reducing the aspects such as O＆M cost, excavating equipment potential life-span.
To realize above-mentioned technical purpose, the technical scheme for being used is：Embedded shelf depreciation based on pulse current method
On-line monitoring intelligence instrument, is powered by power circuit, and 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, to the current signal coupling for collecting
Merging is separated, and obtains power current and high frequency partial discharge pulse current, and by power current and high frequency partial electric discharge arteries and veins
Rush electric current and be 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
Modulate circuit, power frequency component modulate circuit includes power frequency bleeder circuit and power frequency follower, and power-frequency voltage signal is through power frequency partial pressure
Power frequency follower is sent to after circuit step-down；Shelf depreciation voltage signal conditioning circuit includes gain-programmed amplifier, positive and negative puts
Big device, bandpass filter, absolute value peak detecting circuit and partial discharge follower, shelf depreciation voltage signal are put through programme-controlled gain
After big device reduces gain or increase gain, positive and negative amplifier, bandpass filter, absolute value peak detecting circuit feeding are sequentially passed through
Partial discharge follower；
Cpu circuit, is connected with signal conditioning circuit, the power-frequency voltage signal and part of the output of real-time monitoring signal conditioning circuit
Discharge voltage signal, display monitoring result.
When institute's detection signal is small-signal, amplifier improves gain factor to gain-programmed amplifier of the present invention,
Ensure the sensitivity of amplifying circuit；Institute's detection signal be big signal when, then amplifier reduce gain factor, the big signal of self adaptation,
So that signal amplifies measurement range of the result without departing from instrument global design.
Positive and negative amplifier of the present invention, comprising an in-phase amplifier and an inverting amplifier；In-phase amplifier
Amplify for positive discharge pulse, export direct impulse signal；Phase inverter is directed to negative discharge pulse and amplifies, the same positive arteries and veins of output
Rush signal.
Cpu circuit of the present invention 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.
Present invention has the advantages that：
1）First, the present invention is put with the Partial Discharge Detecting Technology of direct method as theoretical foundation using the part of pulse current method
Electro-detection method, the discharge pulse directly produced to detect in controller switching equipment or in power system using annexation electrically
Electric 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, belongs 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 for being detected calculated, is analyzed, processed,
Record and teletransmission, with continuous capturing discharge fault, find controller switching equipment discharging law, effectively evade and periodically patrol and examine institute in 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
, be connected to device in power system using rf signal line by formula, and signal is received 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 improve, the detection " blind area " of existing testing equipment has been cleared away, has been evaded the cycle and has been patrolled
Detection leakage phenomenon in inspection, overcomes the signal detection difficult problem that metal-enclosed type controller switching equipment brings；With data analysis, note
The function such as record and unofficial biography, can constitute system and collect big data, carry out statistical analysis, be the economy point of all kinds of electric companies
The science operation means such as analysis, risk assessment and asset management analysis provide data foundation, are conducive to setting up expert system, and reduction sets
Standby 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 invention.
Fig. 3 is the theory diagram of impedance matching circuit of the invention.
Fig. 4 is the theory diagram of signal conditioning circuit of the invention.
In figure：1st, resistance hole match circuit, 2, signal conditioning circuit, 21, power frequency component modulate circuit, 22, shelf depreciation electricity
Pressure 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.
Specific embodiment
Below in conjunction with accompanying drawing, by describing a more complete embodiment in detail, to do further explaination to the present invention.
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, to the current signal coupling for collecting
Merging is separated, and obtains power current and high frequency partial discharge pulse current, and by power current and high frequency partial electric discharge arteries and veins
Rush electric current and be 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 that power frequency component modulate circuit 21 and local discharge signal are adjusted
Reason circuit 22, power frequency component modulate circuit 21 includes power frequency bleeder circuit 211 and power frequency follower 212, power-frequency voltage signal warp
Power frequency bleeder circuit 211 is sent to power frequency follower 212 after being depressured；Local discharge signal modulate circuit 22 is put including programme-controlled gain
Big device 221, positive and negative amplifier 222, bandpass filter 223, absolute value peak detecting circuit 224 and partial discharge follower 225, office
Portion's discharge voltage signal through gain-programmed amplifier 221 reduce gain or increase gain after, sequentially pass through positive and negative amplifier 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 and part of the output of real-time monitoring signal conditioning circuit
Discharge voltage signal, display monitoring result.
Its specific implementation step is as follows：
The first step, when having partial discharge phenomenon to occur on the high voltage electric equipment of primary system, it may occur that the migration of electric charge, is matching somebody with somebody
A pulse-type current, Fig. 1 is produced to show direct method Partial Discharge Detection principle schematic on electric equipment metallic conductor.
Second step, shown in Fig. 2, the embedded partial discharge monitoring intelligence instrument based on pulse current method, by penetrating
Frequency holding 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 apparatus of the present invention, while power current can also be come in by radio frequency line transmission.
3rd step, the current signal that impedance matching circuit 1 is received is by impedance matching circuit signal coupling electricity therein
Road couples power current and high frequency partial discharge pulse current, and different characteristic using two kinds of signals separates both；Resistance
The current signal being coupled in anti-match circuit 1 is changed into shelf depreciation voltage signal and power frequency electric by the effect of detection impedance again
Pressure signal.
Impedance matching circuit 1 is connected with signal conditioning circuit 2.Signal conditioning circuit 2 is included：Power frequency component modulate circuit
21 and local discharge voltage signal conditioning circuit 22.
4th step, the power-frequency voltage signal obtained by impedance matching circuit 1 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 processes high-tension power frequency component step-down, being changed into can be to amplify
The signal of device treatment, is then sent to power frequency follower 212 by above-mentioned signal.
For shelf depreciation voltage signal：Shelf depreciation voltage signal is amplified appropriate times by gain-programmed amplifier 221
Number；Gain-programmed amplifier 221, when institute's detection signal is small-signal, amplifier 221 improves gain factor, it is ensured that amplify electricity
The sensitivity on road；When institute's detection signal is big signal, then amplifier 221 reduces gain factor, the big signal of self adaptation 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 and amplifies, and exports direct impulse signal；Phase inverter is directed to
Negative discharge pulse amplifies, same output direct impulse signal；
Positive and negative amplifier 222 is connected with bandpass filter 223.Frequency of the bandpass filter 223 according to shelf depreciation voltage signal
Rate characteristics design so that the signal for possessing local discharge characteristic passes through, filtering interfering and noise signal, enter to measured signal
Row 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, detection treatment is carried out by duration extremely short partial discharge pulse's signal, and finally takes out two-way detection
The maximum of circuit.《Measurement of partial discharge GB/T 7354-2003》4.3.3 chapters and sections point out, " special recommendation indicating instrument and
Recorder is quantified to the maximum partial discharge value for repeating ".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 discharge signal to the high frequency has carried out down conversion process, reduces the performance to the A/D sample conversion links of CPU
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, mainly 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 touches display, SD card storage etc..
5th step, signal acquisition, the multiplexed signal sampling unit of cpu circuit respectively with the power frequency component of 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, is turned using high speed, high-precision AD
Parallel operation realizes seizure, the conversion to local discharge signal, and the continuous acquisition to power-frequency voltage and judgement, and special by recurrence
Levy parameter extraction, filtering scheduling algorithm obtain shelf depreciation situation and the powered result of power frequency, finally by the probability strength of discharge of gained,
It has been shown that, record, teletransmission or download etc. during the fructufy of averaged discharge intensity, electric discharge frequency etc. and power frequency powered situation；
Above-mentioned all circuits all provide power supply by power circuit, and power circuit 5 is by switch power module 51 and LPF
Device 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, for the asset management of power grid enterprises provides maximum
Support on limit ground.
Claims (4)
1. the embedded partial discharge monitoring intelligence instrument based on pulse current method, is powered by power circuit, and its feature exists
In：Intelligence instrument 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, to the current signal coupling for collecting
Merging is separated, and obtains power current and high frequency partial discharge pulse current, and by power current and high frequency partial electric discharge arteries and veins
Rush electric current and be 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 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 step-down（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 signal conditioning circuit, the power-frequency voltage signal and part of the output of real-time monitoring signal conditioning circuit
Discharge voltage signal, display monitoring result.
2. the embedded partial discharge monitoring intelligence instrument of pulse current method, its feature are based on as claimed in claim 1
It is：Described gain-programmed amplifier（221）When institute's detection signal is small-signal, amplifier（221）Improve gain factor,
Ensure the sensitivity of amplifying circuit；When institute's detection signal is big signal, then amplifier（221）Reduce gain factor, self adaptation is big
Signal so that signal amplifies measurement range of the result without departing from instrument global design.
3. the embedded partial discharge monitoring intelligence instrument of pulse current method, its feature are based on as claimed in claim 1
It is：Described positive and negative amplifier（222）, comprising an amplifier in the same direction and a sign-changing amplifier；Amplifier in the same direction is directed to
Positive discharge pulse amplifies, and exports direct impulse signal；Phase inverter is directed to negative discharge pulse and amplifies, same output direct impulse letter
Number.
4. the embedded partial discharge monitoring intelligence instrument of pulse current method, its feature are based on as claimed in claim 1
It is：Described cpu circuit includes enough FLASH program memory spaces and abundant I/O mouthfuls microprocessor, high speed, telecommunication
Interface, USB download circuits, A/D modular converters, LCD touches display, SD card storage.
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