CN105116223B - A kind of insulator contamination grade monitoring method based on leakage current phase difference - Google Patents
A kind of insulator contamination grade monitoring method based on leakage current phase difference Download PDFInfo
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- CN105116223B CN105116223B CN201510430721.0A CN201510430721A CN105116223B CN 105116223 B CN105116223 B CN 105116223B CN 201510430721 A CN201510430721 A CN 201510430721A CN 105116223 B CN105116223 B CN 105116223B
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- 239000012212 insulator Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 238000011109 contamination Methods 0.000 title claims abstract description 17
- 238000012795 verification Methods 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims abstract description 8
- 238000012806 monitoring device Methods 0.000 claims abstract description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000009795 derivation Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 abstract description 3
- 229910052573 porcelain Inorganic materials 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 11
- 239000004615 ingredient Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- -1 drizzle Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000005413 snowmelt Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- Testing Relating To Insulation (AREA)
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The insulator contamination grade monitoring method based on leakage current phase difference that the invention discloses a kind of is achieved by insulator leakage：It includes the following steps：The relative humidity of monitoring device synchronous acquisition leakage current and environment, to leakage current bandpass filtering, relative humidity verification, derive under voltage fundamental component, the different relative humidity of extraction mutually the table of the phase information of voltage and leakage current, the phase difference for calculating voltage and leakage current, relative humidity verification, the calculating of K values, inquiry K values and gradation for surface pollution in the same time and obtain pollution severity of insulators grade.The present invention does not need measurement voltage signal and obtains voltage-phase, it is by the phase difference between insulator leakage current and voltage and combines humidity variation assessment pollution severity of insulators grade, realize the real-time monitoring of pollution severity of insulators grade, measurement error is small, and precision is high, can preferably be suitable for the porcelain insulator of different voltages grade.
Description
Technical field
The insulator contamination grade monitoring method based on leakage current phase difference that the present invention relates to a kind of, more particularly to transmission of electricity
A kind of insulator contamination grade monitoring method based on leakage current phase difference of circuit.
Background technology
Insulator is a kind of special insulation control, is for supporting and fixing busbar and energized conductor and make band conductance
Between body or conductor is between the earth has at a distance from enough and insulation.With the development of electric system, especially in transmission line of electricity side
Face, the demand to insulator are increasing.
The reliability of transmission line of electricity directly affects the safe and reliable operation of electric system.And the failure of insulator is to threaten
The main reason for transmission line safety is run.The insulator of transmission line of electricity is required in atmospheric over-voltage, internal overvoltage and long-term
It can reliability service under working voltage.But it is deposited on the solid of insulator surface, liquids and gases particle and mist, drizzle, melts
It is acted on while the bad weather conditions such as ice, snow melt, the electrical strength of insulator is made to substantially reduce, to make transmission line of electricity and change
The insulator in power station is not only possible to occur flashover under overvoltage effect, and more frequent is that filth occurs under longtime running voltage
Flashover causes power outage.Pollution flashover is related with environment dirt, generally speaking, it with industrial expansion and transmission voltage raising
And it is on the rise.
Leakage current can monitor the parameter of insulator pollution condition on-line, it with surface filth accumulation, make moist it is complete
Process, variation characteristic dynamic reflect accumulation and the wetness degree of pollution severity of insulators, that is, characterize that insulator is practical to be connect
The degree of nearly pollution flashover.Therefore, from Mechanism of Contamination Flashover, leakage current is ideal monitoring parameter, measures and does not need complexity
Equipment easily realizes that on-line continuous measures.
Leakage current phase difference can be very good the state of prediction pollution severity of insulators.Its principle is：Voltage leak electricity
The stream changed essential reason of phase difference is that capacitive in leakage current, resistive and inductance current ingredient are changing.And
Capacitive, resistive and inductance current ingredient are different in the leakage current of insulator under different gradation for surface pollution.
With gradually rising for transmission line of electricity voltage class, the direct voltage waveform for measuring transmission line of electricity there is certain
Difficulty.The case where there are wave distortions again is measured by divider, and needs certain measurement cost.
How it is safe and reliable and accurately by leakage current phase difference monitor insulator contamination grade, be circuit transport
The basic means of monitoring insulator contamination grade are realized under row state.
Invention content
The technical problem to be solved in the present invention is to provide a kind of, and the insulator contamination grade based on leakage current phase difference is supervised
Survey method, to realize the real-time monitoring of pollution severity of insulators grade, measurement error is small, and precision is high, can preferably be suitable for
The porcelain insulator of different voltages grade.
In order to solve the above technical problems, the technical solution adopted by the present invention is that：It is a kind of based on the exhausted of leakage current phase difference
Edge gradation for surface pollution monitoring method is carried out by following 4 steps：Data acquisition and processing (DAP), voltage fundamental component derive, leakage
Current and phase difference calculates, and is finally the calculating of K values and the acquisition of gradation for surface pollution.
Above-mentioned data acquisition and processing (DAP) (1) is by step S1：Monitoring device synchronous acquisition leakage current Ix(n) and the phase of environment
To humidity RHWith step S2：Two parts of leakage current bandpass filtering are formed.The each periodic sampling N of leakage current in wherein S1
A, N >=128 obtain discrete total current function Ix(n), 0~N of n values.Every 48 hours take the leakage of a synchronous acquisition
Current waveform and relative air humidity RHData；The formula of S2 leakage current bandpass filterings is Ix(n)BP=(∑ Ix(n-i)×
ai), i=(0~24), a0~a24Value be
(4,5,7,11,16,22,28,34,39,44,48,50,51,50,48,44,39,34,28,22,16,11,7,5,
4), Ix(n)BPFor the leakage current fundametal compoment after bandpass filtering.
The derivation (2) of above-mentioned voltage fundamental component derives two portions of voltage fundamental component by the verification of S3 relative humidity and S4
It is grouped as.The method of wherein S3 relative humidity verification is to meet formula RH<30%；The formula that S4 derives voltage fundamental component is Ux
(n)BP=(- jIx(n)BP)/(ω C), Ux(n)BPFor voltage fundamental component ,-j indicates that 90 ° of voltage delay electric current, ω indicate angular frequency
Rate, C indicate capacitance.
The calculating (3) of above-mentioned leakage current phase difference extracts under different relative humidity mutually voltage in the same time and leakage electricity by S5
The phase information and S6 of stream calculate voltage and two parts of phase difference of leakage current form.The formula of phase difference is in wherein S6 For leakage current phase difference,Indicate the phase of voltage,Indicate the phase of electric current.
The calculating of above-mentioned K values and the acquisition (4) of gradation for surface pollution are by step：The verification of S7 relative humidity, the calculating of S8K values, S9
It inquires the table of K values and gradation for surface pollution and step S10 obtains four parts of pollution severity of insulators grade and forms.Wherein S7 is opposite
The method of humidity verification is to meet following two formula simultaneously：65%<RH<95%, Δ RH>=20%, Δ RHIndicate relative humidity
Difference；The formula of K values is in S8The table of phase difference and gradation for surface pollution is obtained in laboratory test in S9；
Insulator contamination grade is divided into five grades of a, b, c, d, e in S10.
The principle of the present invention is：The electricity of transmission line of electricity is extrapolated using leakage current fundamental waveform when relative humidity is relatively low
Fundamental waveform is pressed, leakage current phase difference is calculated, phase difference (insulator when relative humidity is higher when extraction relative humidity is higher
Upper filthy difference can change capacitive in leakage current, resistive and inductance current ingredient), it then inquires and is obtained by laboratory
Phase difference and gradation for surface pollution table predict gradation for surface pollution.
It is using advantageous effect caused by above-mentioned technical proposal：Using this method, it can be achieved that in high-voltage operation environment
The real-time monitoring of insulator leakage current and monitoring point microclimate situation, measurement error is small, and precision is high, can preferably be suitable for not
With the porcelain insulator of voltage class.Electric power accident caused by for the filth of reduction electric transmission line isolator provides effective guarantee,
Have great importance and practical value to improving Operation of Electric Systems security and reliability.
Description of the drawings
Fig. 1 is the flow diagram of the present invention；
Specific implementation mode
It further illustrates with reference to the accompanying drawings and examples：
Referring to attached drawing 1, a kind of insulator contamination grade monitoring method based on leakage current phase difference is given in figure, is had
Body includes following 10 steps：S1 monitoring device synchronous acquisition leakage currents Ix(n) and the relative humidity R of environmentH, S2 to leakage
Electric current bandpass filtering, the verification of S3 relative humidity, S4 derive that phase is in the same time under voltage fundamental component, the different relative humidity of S5 extractions
The phase information of voltage and leakage current, S6 calculate the phase difference of voltage and leakage current, the verification of S7 relative humidity, S8 calculating K
The table and S10 of value, S9 inquiry K values and gradation for surface pollution obtain pollution severity of insulators grade.
Step S1：On-line Monitoring of Leakage Current device synchronous acquisition leaks the relative humidity of total current and environment, leakage electricity
The N number of point of each periodic sampling is flowed, N >=128 obtain discrete total current function Ix(n), 0~N of n values.Every 48 hours take once
The leakage current waveform and relative air humidity R of synchronous acquisitionHData.Wherein, On-line Monitoring of Leakage Current device can be used
The On-line Monitoring of Leakage Current device of Wuhan University's exploitation, can also be used other similar products certainly.
Step S2 is I to the formula of total current AC compounent bandpass filteringx(n)BP=(∑ Ix(n-i)×ai), i=(0~
24), a0~a24Value be (4,5,7,11,16,22,28,34,39,44,48,50,51,50,48,44,39,34,28,22,
16,11,7,5,4), Ix(n)BPFor the total current AC compounent after bandpass filtering.
The method of step S3 relative humidity verification is to meet formula RH<30%.
The formula that step S4 derives voltage fundamental component is Ux(n)BP=(- jIx(n)BP)/(ω C), Ux(n)BPFor voltage base
Wave component ,-j indicate that 90 ° of voltage delay electric current, ω indicate that angular frequency, C indicate capacitance.
Step S5 extracts voltage and leakage current phase information under different relative humidity mutually in the same timeWith
Step S6 calculates the phase difference of voltage and leakage current under different relative humidity
The method of step S7 relative humidity verification is to meet following two formula simultaneously：65%<RH<95%, Δ RH≥
20%, Δ RHIndicate relative humidity differential.
Step S8 is according to phase differenceWith relative humidity differential Δ RHCalculate K values formula be
The chart of the table of step S9 inquiry K values and gradation for surface pollution, phase difference and gradation for surface pollution is in laboratory through experiment
It obtains.Referring to the following table 1, table 1 is the table of K values and gradation for surface pollution.For example, the table of phase difference and gradation for surface pollution can be in Wuhan
University's high voltage is obtained with the experiment of Insulation Test room.
Step S10 obtains pollution severity of insulators grade, and insulator contamination grade is divided into five grades of a, b, c, d, e.
The invention proposes the method for not needing measurement voltage signal and obtaining voltage-phase, by working as RH<
Insulator can be equivalent to capacitive reactances this characteristic when 30%, and voltage is extrapolated according to filtered leakage current fundametal compoment
Fundamental wave.
Table 1
| K | 0~1 | 1~2.5 | 2.5~5 | 5~9 | 9~15 |
| Gradation for surface pollution | a | b | c | d | e |
The present invention has been described in detail with reference to the accompanying drawings, those skilled in the art can be according to upper
It states and bright many variations example is made to the present invention.Thus, certain details in embodiment should not constitute limitation of the invention, this
Invention will be using the range that the appended claims define as protection scope of the present invention.
Claims (4)
1. a kind of insulator contamination grade monitoring method based on leakage current phase difference, it is characterised in that：It includes following 4
Module：The computing module of data acquisition and processing (DAP) module (1), the derivation module (2) of voltage fundamental component, leakage current phase difference
(3), the acquisition module (4) of the calculating of K values and gradation for surface pollution；
The formula of K values is For leakage current phase difference, Δ RHIndicate relative humidity differential；
The data acquisition and processing (DAP) module (1) includes following two steps：
S1：Monitoring device synchronous acquisition leakage current Ix(n) and the relative humidity R of environmentH；
S2：To leakage current bandpass filtering, the N number of point of each periodic sampling of leakage current in wherein step S1, N >=128, obtain from
Dissipate total current function Ix(n), 0~N of n values, every 48 hours take the leakage current waveform of synchronous acquisition and air opposite
Humidity RHData；The formula of step S2 leakage current bandpass filterings is Ix(n)BP=(∑ Ix(n-i)×ai), i=(0~24),
a0~a24Value be (4,5,7,11,16,22,28,34,39,44,48,50,51,50,48,44,39,34,28,22,16,
11,7,5,4), Ix(n)BPFor the leakage current fundametal compoment after bandpass filtering.
2. a kind of insulator contamination grade monitoring method based on leakage current phase difference according to claim 1, special
Sign is that the derivation module (2) of the voltage fundamental component includes following two steps：
S3：Relative humidity is verified；
S4：Derive voltage fundamental component；
The method of wherein step S3 relative humidity verification is to meet formula RH<30%；The formula that S4 derives voltage fundamental component is Ux
(n)BP=(- jIx(n)BP)/(ω C), Ux(n)BPFor voltage fundamental component ,-j indicates that 90 ° of voltage delay electric current, ω indicate angular frequency
Rate, C indicate capacitance.
3. a kind of insulator contamination grade monitoring method based on leakage current phase difference according to claim 1, special
Sign is that the computing module (3) of the leakage current phase difference includes following two steps：
S5：Extract under different relative humidity the mutually phase information of voltage and leakage current in the same time；
S6：Calculate the phase difference of voltage and leakage current；
The formula of phase difference is in wherein step S6 For leakage current phase difference,Indicate the phase of voltage,Table
Show the phase of electric current.
4. a kind of insulator contamination grade monitoring method based on leakage current phase difference according to claim 1, special
Sign is that the calculating of the K values and the acquisition module (4) of gradation for surface pollution include following part：
S7：Relative humidity is verified；
S8：The calculating of K values；
S9：Inquire the table of K values and gradation for surface pollution；
S10：Obtain pollution severity of insulators grade；
The method of wherein S7 relative humidity verification is to meet following two formula simultaneously：65%<RH<95%, △ RH>=20%, △
RHIndicate relative humidity differential；The formula of K values is in S8The table of K values and gradation for surface pollution is in Wuhan University in S9
What high voltage was tested with Insulation Test room；Insulator contamination grade is divided into five grades of a, b, c, d, e in S10.
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- 2015-07-21 CN CN201510430721.0A patent/CN105116223B/en active Active
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