CN106597229A - Working method of insulation online monitoring system for voltage transformation equipment (greater than 35kV) - Google Patents
Working method of insulation online monitoring system for voltage transformation equipment (greater than 35kV) Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000012544 monitoring process Methods 0.000 title claims abstract description 25
- 230000009466 transformation Effects 0.000 title abstract description 6
- 238000009413 insulation Methods 0.000 title abstract description 3
- 238000005070 sampling Methods 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 12
- 230000001360 synchronised effect Effects 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims description 18
- 230000000737 periodic effect Effects 0.000 claims description 14
- 238000001228 spectrum Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 23
- 230000010354 integration Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000003750 conditioning effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 229960001296 zinc oxide Drugs 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005314 correlation function Methods 0.000 description 1
- 238000013523 data management Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- G01R31/1227—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 of components, parts or materials
- G01R31/1236—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 of components, parts or materials of surge arresters
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- 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
-
- 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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention relates to a working method of an insulation online monitoring system for voltage transformation equipment (greater than 35kV), and the method employs a current measurement device for measuring a leakage current of an MOA or capacitive equipment. The current measurement device comprises a first mutual inductor which is used for obtaining a leakage current signal of the MOA or the capacitive equipment, a second mutual inductor which is used for obtaining a voltage signal of a power grid, a synchronization ADC which is connected with the first and second mutual inductors, a CPU connected with the synchronization ADC, and a communication module connected with the CPU. In the system, the method for measuring the resistive leakage current of the MOA or the capacitive equipment comprises the steps: carrying out the synchronous sampling of W pieces of sampling data of the voltage of the power grid and the leakage current signal of the MOA or the capacitive equipment at equal intervals; obtaining the m1-order harmonic amplitude and initial phase angle of the voltage of the power grid; obtaining the m2-order harmonic amplitude and initial phase angle of the leakage current; calculating the effective value of the resistive leakage current through the harmonic superposing principle; calculating the initial phase angles of the voltage of the power grid and the leakage current; obtaining a projection angle of the leakage current on the voltage of the power grid through a projection method; and calculating the resistive leakage current.
Description
Technical field
The present invention relates to a kind of converting equipment insulated on-line monitoring system and its method of work.
Background technology
At present, the experiment work of China's Substation Electric Equipment, is still mainly preventative according to electrical equipment《Test rule
Journey》Requirement periodically carry out preventive trial.The running status of equipment is judged according to the result of test, so that it is determined that it is whether
Can continue to put into operation.Adhere to that safe operation of the preventive trial to China's power system serves very big work for a long time
With, but with power system high capacity, Towards Higher Voltage and complex structure, with the development of industrial and agricultural production, to power train
The requirement of the security reliability index of system also more and more higher.This traditional test has seemed more inadaptable with diagnostic method, main
Show and need at the trial power failure, the test period is long.Few power transmission amount and economic life is caused to bring certain impact, this is just difficult
With timely tracing trouble defect.With being in full swing that high pressure equipment repair based on condition of component works, set up a set of real-time monitoring power transformation and set
The system of standby running status, for converting equipment state estimation, risk analyses, fault diagnosis, Strategies of Maintenance decision-making technology is provided
Support is very necessary.
Metal oxide arrester（Abbreviation MOA）Because its superior overvoltage protection characteristic is obtained extensively in power system
Using, but MOA resistor discs it is aging and undergo heat and impact failure can cause failure, seriously may result in its blast, take shelter from the thunder
Device puncture also result in substation bus bar short circuit, affect system safety operation, it is therefore necessary to operating MOA is strictly had
The detection of effect and periodic preventative are tested.Leakage electricity in the detection and test of Zinc-Oxide Arrester, under ac operation voltage
Flow measurement is an important project, and the size of the resistive current first harmonics composition in leakage current can relatively accurately reflect Zinc Oxide and keep away
The defect such as thunder device makes moist, the aging and built-in electrical insulation of valve block is impaired.Therefore, the parameters such as resistive leakage current fundamental wave are carried out accurately
Measurement just relatively accurately can differentiate to MOA performances.
MOA testing current in resistance property device application frequency analyses technologies are to parameters such as the resistive leakage currents of operating MOA
Detected, and then judged the performance of MOA.The test device is typically sensed by MOA Leakage Current sensors, line voltage
Device, signal conditioning circuit, data acquisition circuit, CPU and corresponding analysis software composition.MOA Leakage Current sensors are typically adopted
Current Transformer, string is located in the earth lead of the lower end of MOA, obtains the Leakage Current of MOA；Grid voltage sensor is typically adopted
With voltage transformer, the voltage signal of electrical network is obtained near PT equipment；The electricity that signal conditioning circuit sends sensor
Pressure, current signal are transformed to be adapted to the voltage signal of Acquisition Circuit sampling；The signal after conditioning is carried out by data acquisition circuit
Sampling, then the analysis to harmonic wave and detection are completed by analysis software, and then obtain the resistive Leakage Currents of MOA.Prior art is obtained
The precision for taking the resistive Leakage Currents of MOA is relatively low, and this have impact on accuracy and reliability to MOA performance criterias.
The so-called frequency for referring to two periodic signals with frequency periodic signal is identical；The initial phase angle of so-called periodic signal, be
Refer to：For a periodic signal,（Wherein：For integer, T is the cycle）, initial phase angle, formula
In：t0It is from the nearest zero crossing of origin；So-called phase contrast is referred to：Two differences with frequency initial phase angle of periodic signal.
Phase difference measurement has emphatically in power equipment state monitoring, signal collection and analysis, the field such as communicate, automatically control
The meaning wanted.Conventional method for measuring phase difference has zero passage method, correlational analysis method and waveform transformation approach etc. various.
Zero passage method includes zero-crossing timing method and zero passage voltage relative method etc..
Zero-crossing timing method is the time difference of detection cycle signal zero-crossing, the method need it is accurate determine the zero crossing time and
High-precision timing device, but often there is larger error in the method for the determination zero crossing of routine.
Zero passage voltage relative method be measure two sine waves near zero-crossing point voltage difference then by sine relation come
Phase contrast is calculated, in the case of having harmonic wave, the phase angle and voltage magnitude obtained using zero-crossing method measurement is each harmonic arrow
The phase angle of amount overlaid waveforms and voltage magnitude, and do not meet sinuso sine protractor.
Correlational analysis method is directly proportional to its phase contrast using the cross-correlation function zero moment value of two same frequency sinusoidal signals
Principle obtain phase contrast.But because the determination of zero-crossing timing is more difficult, and spatial interference is in the feelings for having fixed interference source
It is also and non-fully uncorrelated under condition, therefore certainty of measurement cannot ensure.
Waveform transformation approach is that periodic signal is converted into into other waveforms such as triangular wave, sawtooth waveforms, square wave to measure its phase later
Potential difference, this kind of method is the deformation of cross zero detecting method, with similar measurement drawback.
The content of the invention
The technical problem to be solved is to provide a kind of converting equipment insulated on-line monitoring system and its work side
Method, by obtaining high-precision phase difference measurements, to obtain the resistive leakage current of high-precision MOA or capacitive apparatus,
And then improve to MOA or the accuracy and reliability of capacitive apparatus performance criteria.
To solve above-mentioned technical problem, the invention provides a kind of converting equipment insulated on-line monitoring system, it includes：It is embedding
Enter formula processor, touch screen, network communication interface, multiple serial ports and the relay being connected with the flush bonding processor；Described
Serial ports is connected with the current measuring device for measuring MOA or capacitive apparatus leakage current；The current measuring device includes：For
The first transformer of the leakage current signal of MOA or capacitive apparatus is obtained, for obtaining the second mutual inductance of the voltage signal of electrical network
Device, the synchronous ADC being connected with first, second transformer, the communication mould that ADC synchronous with this connected CPU is connected with the CPU
Block；The CPU is connected by the serial ports with flush bonding processor；The relay is used to control the current measuring device
Power supply.
Two current sensors are transformed to voltage signal tested current signal, then by digitized measurement system to signal
Carry out integer-period sampled（ADC）And the plesiochronous DFT process of improvement type, obtain the fundamental wave vector and its phase place folder of the two signals
Angle.Discounting for voltage transformer（PT）Phase distortion problem, then can easily calculate the medium of capacitance type equipment Cx
The fundametal compoment peak I of the current in resistance property of loss Tan δ-value and spark gap equipment MOARP.With conventional phase place Zero-cross comparator method phase
Than, the great advantage of the method is analog signal processing circuit that need not be complicated, and the stability of long-term work is guaranteed, and
Harmonic wave interference effect can effectively be suppressed.Actual measurement shows, even if the harmonic signal content in tested current signal and fundamental wave content phase
Together, also dielectric loss and current in resistance property result will not be impacted.
The method of work of above-mentioned converting equipment insulated on-line monitoring system, it includes：The resistive leakage of MOA or capacitive apparatus
The measuring method of electric current, the measuring method includes：
（a）W sampled data of the Leakage Current signal of synchronized sampling line voltage and the MOA or capacitive apparatus at equal intervals；
（b）The m of line voltage is obtained using harmonic analysis method to above-mentioned W sampled data1Subharmonic amplitude Vk1And initial phase angle
φVk1, k1=1 ..., m1；Meanwhile, obtain the m of the Leakage Current2Subharmonic amplitude Ik2With initial phase angle φIk2, k2=1 ..., m2；
The m1、m2Respectively not less than the line voltage and the highest overtone order of Leakage Current signal discrete frequency spectrum；
（c）Using harmonic superposition principleCalculate virtual value I of the Leakage Current；
（d）Calculate initial phase angle φ of line voltage and the Leakage CurrentVAnd φI；
（e）Projected angle φ of the Leakage Current on line voltage is obtained according to sciagraphy=φI-φV；
（f）Calculate the resistive Leakage Current I of the MOA or capacitive apparatusR=Icos(φ) 。
Described synchronized sampling at equal intervals is same in a cycle to line voltage and the Leakage Current signal respectively
When sample N points, i.e., sample frequency isf s =Nf, andN >=64, f isThe frequency of line voltage.
As a kind of preferred, the step（d）According to the initial phase angle of following initial phase angle Equation for Calculating periodic signal：
, wherein, φkFor harmonic wave phase angle, AkFor harmonic amplitude,For integer；Calculate institute
State initial phase angle φVAnd φIWhen, the value of m is respectively the m1、m2。
As another kind of preferred scheme, the step（d）Using following steps：
（1）, take φ=φ1；
（2）, substitute intoCalculate；
（3）, substitute intoCalculate；
（4）, with calculate obtainWithSubstitute intoCalculate new φ；
（5）, repeat step（2）、（3）、（4）Until φ restrains or meets required precision.
Preferably, the m1、m2Highest overtone order and required analysis of the number of times of subharmonic by tested periodic signal
Precision and make corresponding selection, but the highest overtone order of no less than tested periodic signal discrete spectrum.
W is determined by sampling number N in the cycle and selected harmonic analysis method, such as changed using discrete fourier
（DFT）Method or fast Fourier change（FFT）During method, W=nN（N is the periodicity of sampling）；Plesiochronous harmonic analysis method is by integrating
Method determines that conventional integration method has muiltiple-trapezoid integration method W=nN, complexification rectangular integration method W=n (N-1), complexification pungent
General gloomy integration method W=n (N-1)/2 etc..The certainty of measurement of the method for measuring phase difference of the present invention by sampling number N in the cycle and
Selected harmonic analysis method determines that calculating process will not bring measurement error, it is possible to obtain high-precision measurement result.
Relative to prior art, the positive effect of the present invention is：
（1）The present invention MOA or capacitive apparatus resistive leakage current measuring method, be intended, primarily, to improve and improve MOA or
The measurement quality of the resistive Leakage Current of capacitive apparatus, obtains high-precision resistive Leakage Current, and then improves to MOA or capacitive
Accuracy and reliability that equipment performance differentiates.The certainty of measurement of the method for measuring phase difference of the present invention is by sampling number in the cycle
N and selected harmonic analysis method determine that calculating process will not bring measurement error, it is possible to obtain high-precision measurement knot
Really.
（2）The converting equipment insulated on-line monitoring system of the present invention is that a set of power transformation for 35kV aboves is high
Voltage electrical equipment, implements the total solution of status monitoring and diagnosis, be adapted to power transformer sleeve pipe in monitoring operation,
Reactor, transformer, the end shield electric current of coupled capacitor device and dielectric loss and capacitance, the leakage current of spark gap, resistive electricity
Stream and movement counting and movement time it is isoparametric monitoring and Monitoring Data is sent in digital form in bus communication mode
Collection control collecting unit.This monitoring system can independent self-organizing system also with intelligent substation monitoring system integrated design, pass through
Ethernet is sent to integrated information platform Monitoring Data, the Monitoring Data of several monitoring system of electric substation can be pooled to
The data management diagnostic system on upper strata, realization carries out concentration prison to the high voltage equipment insulation on-line monitoring system in Duo Zuo transformer stations
Survey monitoring management.User can at any time obtain Monitoring Data result using LAN.
（3）The measuring method of the MOA of the present invention or the resistive leakage current of capacitive apparatus is digital measurement process,
Only need to synchronize sampling according to sample frequency fs same frequency periodic signal tested to two in measurement process, then according to harmonic wave
Analysis method and first phase angle equation carry out computing, it is possible to obtain two initial phase angles φ1And φ2, finally calculate their phase contrast
φ’.Other hardware circuits, full digital starting need not be added in measurement process.
Description of the drawings
Fig. 1 is the structured flowchart of the converting equipment insulated on-line monitoring system of the present invention；
Fig. 2 is the structured flowchart of the current measuring device of the measurement MOA of the present invention or capacitive apparatus leakage current.
Specific embodiment
Present pre-ferred embodiments are given below in conjunction with the accompanying drawings, to describe technical scheme in detail.
As shown in figure 1, the converting equipment insulated on-line monitoring system of the present embodiment includes：Flush bonding processor（ARM11）,
The touch screen being connected with the flush bonding processor（It is preferred that A56TFT resistive touch liquid crystal display screens）, network communication interface（Including：With
Too net, optical fiber interface）, keyboard and multiple serial ports and relay.
Described serial ports is connected with the current measuring device for measuring MOA or capacitive apparatus leakage current；The electric current is surveyed
Amount device includes：For obtaining the first transformer of the leakage current signal of MOA or capacitive apparatus, for obtaining the voltage of electrical network
Second transformer of signal, the synchronous ADC being connected with first, second transformer, ADC synchronous with this connected CPU（It is preferred that
STM32 series A RM processors）The communication module being connected with the CPU；The communication module includes RS-485 and CAN communication mould
Block；Parameters can use ModBus rtu protocol teletransmissions by RS-485 or CAN.
The CPU is connected by the serial ports with flush bonding processor；The relay is used to control the current measurement
The power supply of device.
The measuring method of the resistive leakage current of above-mentioned MOA or capacitive apparatus includes：
（a）W sampled data of the Leakage Current signal of synchronized sampling line voltage and the MOA or capacitive apparatus at equal intervals：
F (i), i=0,1 ..., W-1 } and { f2(i),i=0,1,…,W-1}.W is by sampling number N in the cycle and selected harmonic wave point
Analysis method is determined, such as changed using discrete fourier（DFT）Method or fast Fourier change（FFT）During method, W=nN（N is sampling
Periodicity）；Plesiochronous harmonic analysis method is determined that conventional integration method has muiltiple-trapezoid integration method W=by integration method
NN, complexification rectangular integration method W=n (N-1), iterative Simpson integration method W=n (N-1)/2 etc..
（b）The m of line voltage is obtained using harmonic analysis method to above-mentioned W sampled data1Subharmonic amplitude { Vk1,k1=
1,…,m1And initial phase angle { φVk1,k=1,…,m1}；Meanwhile, obtain the m of the Leakage Current2Subharmonic amplitude { Ik2,k2=
1,…,m2And initial phase angle { φIk2,k2=1,…,m2}；The m1、m2Respectively not less than the line voltage and Leakage Current signal
The highest overtone order of discrete spectrum, also can be made by the highest overtone order of tested periodic signal and required analysis precision
It is corresponding to select；
（c）Using harmonic superposition principleCalculate virtual value I of the Leakage Current；
（d）Calculate initial phase angle φ of line voltage and the Leakage CurrentVAnd φI；
（e）Projected angle φ of the Leakage Current on line voltage is obtained according to sciagraphy=φI-φV；
（f）Calculate the resistive Leakage Current I of the MOA or capacitive apparatusR=Icos(φ) 。
Described synchronized sampling at equal intervals is same in a cycle to line voltage and the Leakage Current signal respectively
When sample N points, i.e., sample frequency isf s =Nf, andN >=64, f isThe frequency of line voltage.
As a kind of preferred, the step（d）According to the initial phase angle of following initial phase angle Equation for Calculating periodic signal：
, wherein, φkFor harmonic wave phase angle, AkFor harmonic amplitude,For integer；
Calculate initial phase angle φVAnd φIWhen, the value of m is respectively the m1、m2。
As another kind of preferred scheme, the step（d）Using following steps：
（1）, take φ=φ1；
（2）, substitute intoCalculate；
（3）, substitute intoCalculate；
（4）, with calculate obtainWithSubstitute intoCalculate new φ；
（5）, repeat step（2）、（3）、（4）Until φ restrains or meets required precision.
Particular embodiments described above, has been carried out further in detail to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail it is bright, should be understood that the foregoing is only the present invention specific embodiment, be not limited to the present invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., should be included in the guarantor of the present invention
Within the scope of shield.
Claims (1)
1. a kind of method of work of converting equipment insulated on-line monitoring system, the system includes：Flush bonding processor, it is embedded with this
The connected touch screen of formula processor, network communication interface, multiple serial ports and relay；
Described serial ports is connected with the current measuring device for measuring MOA or capacitive apparatus leakage current；
The current measuring device includes：For obtaining the first transformer of the leakage current signal of MOA or capacitive apparatus, for obtaining
Second transformer of the voltage signal of power taking net, the synchronous ADC being connected with first, second transformer, ADC synchronous with this is connected
The communication modules that are connected with the CPU of CPU；The communication module includes RS-485 and CAN communication module；
The CPU is connected by the serial ports with flush bonding processor；The relay is used to control the current measuring device
Power supply；
Characterized in that,
Described method of work, including：The measuring method of the resistive leakage current of MOA or capacitive apparatus, the measuring method includes：
（a）W sampled data of the Leakage Current signal of synchronized sampling line voltage and the MOA or capacitive apparatus at equal intervals；
（b）The m of line voltage is obtained using harmonic analysis method to above-mentioned W sampled data1Subharmonic amplitude Vk1And initial phase angle
φVk1, k1=1 ..., m1；Meanwhile, obtain the m of the Leakage Current2Subharmonic amplitude Ik2With initial phase angle φIk2, k2=1 ..., m2；
The m1、m2Respectively not less than the line voltage and the highest overtone order of Leakage Current signal discrete frequency spectrum；
（c）Using harmonic superposition principleCalculate virtual value I of the Leakage Current；
（d）Calculate initial phase angle φ of line voltage and the Leakage CurrentVAnd φI；
（e）Projected angle φ of the Leakage Current on line voltage is obtained according to sciagraphy=φI-φV；
（f）Calculate the resistive Leakage Current I of the MOA or capacitive apparatusR=Icos(φ) ；
The step（d）According to the initial phase angle of following initial phase angle Equation for Calculating periodic signal：
, wherein, φkFor harmonic wave phase angle, AkFor harmonic amplitude,For integer；Calculate described
Initial phase angle φVAnd φIWhen, the value of m is respectively the m1、m2。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611013773.9A CN106597229B (en) | 2013-05-07 | 2013-05-07 | The working method of 35kV or more transformer equipment insulated on-line monitoring system |
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| CN201310165822.0A CN104142421B (en) | 2013-05-07 | 2013-05-07 | Converting equipment insulated on-line monitoring system and method for work thereof |
| CN201611013773.9A CN106597229B (en) | 2013-05-07 | 2013-05-07 | The working method of 35kV or more transformer equipment insulated on-line monitoring system |
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| CN201611013801.7A Active CN106443307B (en) | 2013-05-07 | 2013-05-07 | Transformer equipment insulated on-line monitoring system |
| CN201611013773.9A Active CN106597229B (en) | 2013-05-07 | 2013-05-07 | The working method of 35kV or more transformer equipment insulated on-line monitoring system |
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| CN110470941A (en) * | 2019-09-16 | 2019-11-19 | 威胜集团有限公司 | Creepage detection method, device, equipment and the storage medium of alternating current |
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| CN106154128B (en) * | 2016-07-11 | 2018-10-26 | 国家电网公司 | The built-in electrical insulation detecting system of high-tension apparatus containing insulator |
| CN106710432B (en) * | 2017-03-07 | 2022-12-30 | 国家电网公司 | Fault simulation gas taking device in transformer |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106707007A (en) | 2017-05-24 |
| CN106443307B (en) | 2018-12-28 |
| CN106597229B (en) | 2019-11-15 |
| CN106443307A (en) | 2017-02-22 |
| CN106707007B (en) | 2019-03-19 |
| CN104142421A (en) | 2014-11-12 |
| CN104142421B (en) | 2016-12-28 |
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