CN106443307A - Online insulation monitoring system for power transformation equipment - Google Patents
Online insulation monitoring system for power transformation equipment Download PDFInfo
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- CN106443307A CN106443307A CN201611013801.7A CN201611013801A CN106443307A CN 106443307 A CN106443307 A CN 106443307A CN 201611013801 A CN201611013801 A CN 201611013801A CN 106443307 A CN106443307 A CN 106443307A
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- leakage current
- moa
- transformer
- initial phase
- phase angle
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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 an online insulation monitoring system for power transformation equipment. The online insulation monitoring system comprises a current measuring device. The current measuring device is used for measuring leakage currents of an MOA (metal oxide arrester) or capacitive equipment; the current measuring device comprises a first transformer, a second transformer, a synchronous ADC (analog-digital converter), a CPU (central processing unit) and a communication module, the first transformer is used for acquiring leakage current signals of the MOA or the capacitive equipment, the second transformer is used for acquiring voltage signals of power grids, the synchronous ADC is connected with the first transformer and the second transformer, the CPU is connected with the synchronous ADC, and the communication module is connected with the CPU. A method for measuring resistive leakage currents of the MOA or the capacitive equipment in the online insulation monitoring system includes synchronously sampling voltages of the power grids and W sample data of the leakage current signals of the MOA or the capacitive equipment at equal intervals; acquiring m1-th harmonic amplitude values and initial phase angles of the voltages of the power grids; acquiring m2-th harmonic amplitude values and initial phase angles of the leakage currents; computing effective values of the resistive leakage currents by the aid of harmonic superposition principles; computing initial phase angles of the voltages of the power grids and the leakage currents; acquiring projection angles of the leakage currents on the voltages of the power grids according to projection processes; computing the resistive leakage currents.
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.According to the result of test judging the running status of equipment, so that it is determined that whether which
Can continue to put into operation.Adhere to that preventive trial serves very big work to the safe operation of China's power system 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
Showing at the trial needs to have a power failure, and 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 for high pressure equipment repair based on condition of component work, set up a set of real-time monitoring power transformation and set
The system of standby running status, is that converting equipment state estimation, risk analyses, fault diagnosis, Strategies of Maintenance decision-making offer technology are propped up
Support is very necessary.
Metal oxide arrester（Abbreviation MOA）Because its superior overvoltage protection characteristic is obtained extensively in power system
Application, but MOA resistor disc is aging and can cause fault through being heated with impact failure, seriously may result in its blast, takes 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 test.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 be differentiated to MOA performance.
MOA testing current in resistance property device application frequency analyses technology is 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 sensor, line voltage
Device, signal conditioning circuit, data acquisition circuit, CPU and corresponding analysis software composition.MOA Leakage Current sensor is typically adopted
Current Transformer, goes here and there in the earth lead of the lower end for being located at 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 sensor is sent by signal conditioning circuit
Pressure, current signal are transformed to be suitable for the voltage signal of Acquisition Circuit sampling；By data acquisition circuit, the signal after conditioning is carried out
Sampling, then the analysis to harmonic wave and detection is completed by analysis software, and then obtain the resistive Leakage Current of MOA.Prior art is obtained
The precision for taking the resistive Leakage Current of MOA is relatively low, and this have impact on accuracy and reliability to MOA performance criteria.
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 the zero crossing nearest from initial point；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 that wants.Conventional method for measuring phase difference has zero passage method, correlational analysis method and waveform transformation approach etc. multiple.
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 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 for obtaining using zero-crossing method measurement and voltage magnitude are each harmonic arrows
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 as the determination of zero-crossing timing is more difficult, and spatial interference is in the feelings for having fixing interference source
Also and non-fully uncorrelated under condition, therefore certainty of measurement cannot ensure.
Waveform transformation approach is periodic signal to be converted 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.
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 accuracy and reliability of the raising to MOA or capacitive apparatus performance criteria.
For solving above-mentioned technical problem, the invention provides a kind of converting equipment insulated on-line monitoring system, which includes：Embedding
Enter formula processor, touch screen connected with the flush bonding 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
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, synchronous ADC connected with first, second transformer, CPU connected with synchronous ADC communication mould connected with the CPU
Block；The CPU is connected with flush bonding processor by the serial ports；The relay is used for controlling 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 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
Same, 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, which includes：MOA or the resistive leakage of 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）Application 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 point, i.e., sample frequency isf s =Nf, andN >=64, f isThe frequency of line voltage.
As a kind of preferred, the step（d）Initial phase angle according to 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 the m respectively1、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、m2The number of times of subharmonic is by highest overtone order and the required analysis of 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, is 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, 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, calculating process will not bring measurement error, it is possible to obtain high-precision measurement result.
With respect to prior art, the positive effect of the present invention is：
（1）The measuring method of the resistive leakage current of the MOA of the present invention or capacitive apparatus, 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, 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 a set of power transformation height for 35kV above
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 isoparametric monitoring and in bus communication mode, Monitoring Data is sent in digital form
Collection control collecting unit.This monitoring system can independent self-organizing system also can pass through with intelligent substation monitoring system integrated design
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, realizes carrying out concentration prison to the high voltage equipment insulation on-line monitoring system in Duo Zuo transformer station
Survey monitoring management.User can obtain Monitoring Data result at any time using LAN.
（3）The measuring method of the resistive leakage current of the MOA of the present invention or capacitive apparatus is digital measurement process,
Only need in measurement process synchronize sampling according to sample frequency fs same frequency periodic signal tested to two, 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 measurement MOA of the present invention or the structured flowchart of the current measuring device of 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）,
Touch screen connected with the flush bonding processor（It is preferred that A56TFT resistive touch liquid crystal display screen）, 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, synchronous ADC connected with first, second transformer, CPU connected with the synchronous ADC（It is preferred that
STM32 series A RM processor）, communication module connected with the CPU；The communication module includes RS-485 and CAN communication mould
Block；Parameters can pass through RS-485 or CAN uses ModBus rtu protocol teletransmission.
The CPU is connected with flush bonding processor by the serial ports；The relay is used for controlling 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 divided by sampling number N in the cycle and selected harmonic wave
Analysis method determines, is 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 by integration method, and conventional integration method has muiltiple-trapezoid integration method W=
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
Corresponding selection；
（c）Application 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 point, i.e., sample frequency isf s =Nf, andN >=64, f isThe frequency of line voltage.
As a kind of preferred, the step（d）Initial phase angle according to following initial phase angle Equation for Calculating periodic signal：
, wherein, φkFor harmonic wave phase angle, AkFor harmonic amplitude,For integer；Meter
Calculate initial phase angle φVAnd φIWhen, the value of m is the m respectively1、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 to the purpose of the present invention, technical scheme and beneficial effect further in detail
Describe in detail bright, the specific embodiment that the foregoing is only the present invention is should be understood that, the present invention is not limited to, all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvement that is done etc., should be included in the guarantor of the present invention
Within the scope of shield.
Claims (1)
1. a kind of converting equipment insulated on-line monitoring system, including：Flush bonding processor, connected with the flush bonding processor tactile
Touch screen, network communication interface, multiple serial ports and relay；
Described serial ports is connected with the current measuring device for measuring MOA leakage current；
The current measuring device includes：For obtaining the first transformer of the leakage current signal of MOA, for obtaining the electricity of electrical network
Second transformer of pressure signal, synchronous ADC connected with first, second transformer, CPU connected with the synchronous ADC and should
The connected communication module of CPU；
The CPU is connected with flush bonding processor by the serial ports；
The relay is used for controlling the power supply of the current measuring device；
Characterized in that,
The method of work of described converting equipment insulated on-line monitoring system, including：The measurement side of the resistive leakage current of MOA
Method, the measuring method includes：
（a）W sampled data of the Leakage Current signal of synchronized sampling line voltage and the MOA 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）Application 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 MOAR=Icos(φ) ；
The step（d）Initial phase angle according to 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 the m respectively1、m2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611013801.7A CN106443307B (en) | 2013-05-07 | 2013-05-07 | Transformer equipment insulated on-line monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611013801.7A CN106443307B (en) | 2013-05-07 | 2013-05-07 | Transformer equipment insulated on-line monitoring system |
| CN201310165822.0A CN104142421B (en) | 2013-05-07 | 2013-05-07 | Converting equipment insulated on-line monitoring system and method for work thereof |
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| CN201310165822.0A Division CN104142421B (en) | 2013-05-07 | 2013-05-07 | Converting equipment insulated on-line monitoring system and method for work thereof |
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| CN106443307B CN106443307B (en) | 2018-12-28 |
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| CN201611013774.3A Expired - Fee Related CN106707007B (en) | 2013-05-07 | 2013-05-07 | The working method of transformer equipment insulated on-line monitoring system |
| CN201310165822.0A Active CN104142421B (en) | 2013-05-07 | 2013-05-07 | Converting equipment insulated on-line monitoring system and method for work thereof |
| 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 |
| CN201611013801.7A Active CN106443307B (en) | 2013-05-07 | 2013-05-07 | Transformer equipment insulated on-line monitoring system |
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| CN201310165822.0A Active CN104142421B (en) | 2013-05-07 | 2013-05-07 | Converting equipment insulated on-line monitoring system and method for work thereof |
| 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106710432A (en) * | 2017-03-07 | 2017-05-24 | 国家电网公司 | Transformer inner fault simulated gas sampling device |
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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 |
| CN108459228A (en) * | 2018-01-11 | 2018-08-28 | 东南大学 | A kind of 10KV metal oxide arresters line detection system for failure and method |
| CN109283385B (en) * | 2018-10-17 | 2021-05-04 | 许昌许继软件技术有限公司 | Lightning arrester monitoring data online processing method and system |
| CN110244144B (en) * | 2019-05-28 | 2021-11-16 | 许昌许继软件技术有限公司 | Lightning arrester state monitoring method and alternating current data acquisition method |
| CN110470941B (en) * | 2019-09-16 | 2021-10-08 | 威胜集团有限公司 | Method, device and equipment for detecting leakage current of alternating current and storage medium |
| CN110716112B (en) * | 2019-11-15 | 2022-01-25 | 国电南京自动化股份有限公司 | Insulation detection method for high-voltage cascaded SVG (static var generator) insulation frame |
| CN111025094A (en) * | 2019-11-19 | 2020-04-17 | 云南电网有限责任公司临沧供电局 | XLPE cable reliability evaluation method based on leakage current change coefficient |
| CN111007435B (en) * | 2019-12-27 | 2022-03-29 | 广东电网有限责任公司电力科学研究院 | Monitoring method, device and equipment for analyzing transformer fault based on resistance-capacitance component |
| CN111323665B (en) * | 2020-03-18 | 2022-06-28 | 合肥瀚度电力科技有限公司 | Lightning arrester monitoring device, method and system based on GPS time service ratio correction |
| CN113534007A (en) * | 2021-07-28 | 2021-10-22 | 广东电网有限责任公司 | Lightning arrester leakage current monitoring method and system |
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| CN106710432B (en) * | 2017-03-07 | 2022-12-30 | 国家电网公司 | Fault simulation gas taking device in transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106597229B (en) | 2019-11-15 |
| CN104142421B (en) | 2016-12-28 |
| CN106707007A (en) | 2017-05-24 |
| CN104142421A (en) | 2014-11-12 |
| CN106707007B (en) | 2019-03-19 |
| CN106597229A (en) | 2017-04-26 |
| CN106443307B (en) | 2018-12-28 |
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