CN105116223A - Insulator pollution level monitoring method based on leakage current phase difference - Google Patents
Insulator pollution level monitoring method based on leakage current phase difference Download PDFInfo
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- CN105116223A CN105116223A CN201510430721.0A CN201510430721A CN105116223A CN 105116223 A CN105116223 A CN 105116223A CN 201510430721 A CN201510430721 A CN 201510430721A CN 105116223 A CN105116223 A CN 105116223A
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- 239000012212 insulator Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012544 monitoring process Methods 0.000 title claims abstract description 24
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000012806 monitoring device Methods 0.000 claims abstract description 4
- 238000011109 contamination Methods 0.000 claims description 17
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 238000009795 derivation Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 229910052573 porcelain Inorganic materials 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 11
- 230000005611 electricity Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
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- Testing Relating To Insulation (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The invention discloses an insulator pollution level monitoring method based on leakage current phase difference. The method is implemented through insulator leakage, and comprises the following steps: a monitoring device synchronously collects leakage current and the relative humidity of the environment; band-pass filtering is carried out on the leakage current; the relative humidity is verified; the fundamental component of voltage is deduced; phase information of voltage and leakage current at the same moment under different relative humidity is extracted; the phase difference between the voltage and the leakage current is calculated; the relative humidity is verified; the K value is calculated; a table of K values and pollution levels is queried to obtain the level of insulator surface pollution. According to the invention, the phase of voltage can be obtained without measuring a voltage signal, the level of insulator surface pollution is evaluated based on the phase difference between the leakage current and the voltage of an insulator and the humidity change, and real-time monitoring of insulator surface pollution level is realized. The method has the advantages of low measurement error and high precision, and can well adapt to porcelain insulators at different voltage levels.
Description
Technical field
The present invention relates to a kind of insulator contamination grade monitoring method based on leakage current phase differential, particularly relate to a kind of insulator contamination grade monitoring method based on leakage current phase differential of transmission line of electricity.
Background technology
Insulator is a kind of special insulation control, is used to support and fixing bus and energized conductor and makes between energized conductor or have enough Distance geometry to insulate between conductor and the earth.Along with the development of electric system, especially in transmission line of electricity, increasing to the demand of insulator.
The reliability of transmission line of electricity directly affects the safe and reliable operation of electric system.And the fault of insulator is the main cause threatening transmission line of electricity safe operation.The insulator of transmission line of electricity requires all can reliability service under atmospheric over-voltage, internal overvoltage and long-time running voltage.But act on while being deposited on the bad weather conditions such as the solid of insulator surface, liquids and gases particulate and mist, drizzle, ice-melt, snow melt, the electrical strength of insulator is reduced greatly, thus make the insulator of transmission line of electricity and transformer station not only under superpotential effect, flashover may occur, frequently be, under long-time running voltage, pollution flashover occurs, cause power outage.Pollution flashover is relevant with environment dirt, generally speaking, it with industrial expansion and transmission voltage rising and be on the rise.
Leakage current can the parameter of on-line monitoring insulator pollution condition, and the overall process that it gathers with surface filth, make moist, gathering and wetness degree of its variation characteristic dynamic reflection pollution severity of insulators, namely characterizes the actual degree close to pollution flashover of insulator.Therefore, from Mechanism of Contamination Flashover, leakage current is desirable monitoring parameter, and it is measured does not need complicated equipment, easily realizes on-line continuous and measures.
Leakage current phase differential can well predict the state of pollution severity of insulators.Its principle is: the essential reason that voltage leak current and phase difference changes is capacitive in leakage current, composition that is resistive and inductance current is changing.And under different gradation for surface pollution insulator leakage current in capacitive, composition that is resistive and inductance current be different.
Along with the rising gradually of transmission line of electricity electric pressure, just there is certain difficulty in the voltage waveform directly measuring transmission line of electricity.Measured and exist the situation of waveform distortion by voltage divider, and need certain measurement cost.
How safely, reliably and accurately by leakage current phase differential monitoring insulator contamination grade, it is the basic means realizing monitoring insulator contamination grade under circuit running status.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of insulator contamination grade monitoring method based on leakage current phase differential, to realize the Real-Time Monitoring of pollution severity of insulators grade, its measuring error is little, and precision is high, the porcelain insulator that can be applicable to different electric pressure preferably.
For solving the problems of the technologies described above, the technical scheme that the present invention takes is: a kind of insulator contamination grade monitoring method based on leakage current phase differential, it is undertaken by following 4 steps: data acquisition and processing (DAP), voltage fundamental component is derived, leakage current phase difference calculating is finally the calculating of K value 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 I
xthe relative humidity R of (n) and environment
hwith step S2: to leakage current bandpass filtering two part composition.The wherein N number of point of each periodic sampling of leakage current in S1, N>=128, obtain discrete total current function I
x(n), n value 0 ~ N.Every leakage current waveform and relative air humidity R getting a synchronous acquisition for 48 hours
hdata; The formula of S2 leakage current bandpass filtering is I
x(n)
bP=(∑ I
x(n-i) × a
i), i=(0 ~ 24), a
0~ a
24value 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), I
x(n)
bPfor the leakage current fundametal compoment after bandpass filtering.
The derivation (2) of above-mentioned voltage fundamental component is derived voltage fundamental component two parts by the checking of S3 relative humidity and S4 and is formed.Wherein the method for S3 relative humidity checking meets formula R
h<30%; The formula of S4 derivation voltage fundamental component is U
x(n)
bP=(-jI
x(n)
bP)/(ω C), U
x(n)
bPfor voltage fundamental component ,-j represents 90 °, voltage delay electric current, and ω represents angular frequency, and C represents electric capacity.
The calculating (3) of above-mentioned leakage current phase differential is extracted under different relative humidity by S5 that the phase information of voltage and leakage current and phase differential two parts of S6 calculating voltage and leakage current form in the same time mutually.Wherein in S6, the formula of phase differential is
for leakage current phase differential,
represent the phase place of voltage,
represent the phase place of electric current.
The calculating of above-mentioned K value and the acquisition (4) of gradation for surface pollution are by step: the checking of S7 relative humidity, the calculating of S8K value, S9 inquire about the form of K value and gradation for surface pollution and step S10 and obtain pollution severity of insulators grade four and partly form.Wherein simultaneously the method for S7 relative humidity checking meets following two formula: 65%<R
h<95%, Δ R
h>=20%, Δ R
hrepresent that relative humidity is poor; In S8, the formula of K value is
in S9, the form of phase differential and gradation for surface pollution obtains at laboratory test; In S10, insulator contamination grade is divided into a, b, c, d, e five grades.
Principle of the present invention is: utilize leakage current fundamental waveform to extrapolate the voltage fundamental waveform of transmission line of electricity when relative humidity is lower, calculate leakage current phase differential, extract relative humidity higher time phase differential (difference filthy on insulator when relative humidity is higher can change the composition of capacitive in leakage current, resistive and inductance current), the form then inquiring about phase differential and the gradation for surface pollution obtained by testing laboratory predicts gradation for surface pollution.
The beneficial effect adopting technique scheme to produce is: adopt this method, the Real-Time Monitoring of insulator leakage current and monitoring point microclimate situation in high-voltage operation environment can be realized, measuring error is little, and precision is high, the porcelain insulator that can be applicable to different electric pressure preferably.For reducing electric transmission line isolator filthy and the electric power accident that causes provides effective guarantee, to raising Operation of Electric Systems safety with reliability has great importance and practical value.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention;
Embodiment
Further illustrate below in conjunction with drawings and Examples:
See giving a kind of insulator contamination grade monitoring method based on leakage current phase differential in accompanying drawing 1, figure, specifically comprise following 10 steps: S1 monitoring device synchronous acquisition leakage current I
xthe relative humidity R of (n) and environment
h, S2 obtains pollution severity of insulators grade to the form of the phase differential of leakage current bandpass filtering, the checking of S3 relative humidity, S4 derives voltage fundamental component, S5 to extract under different relative humidity mutually voltage and leakage current in the same time phase information, S6 calculating voltage and leakage current, the checking of S7 relative humidity, S8 calculating K value, S9 inquiry K value and gradation for surface pollution and S10.
Step S1: On-line Monitoring of Leakage Current device synchronous acquisition leaks the relative humidity of total current and environment, and the N number of point of each periodic sampling of leakage current, N>=128, obtain discrete total current function I
x(n), n value 0 ~ N.Every leakage current waveform and relative air humidity R getting a synchronous acquisition for 48 hours
hdata.Wherein, the On-line Monitoring of Leakage Current device that On-line Monitoring of Leakage Current device can adopt Wuhan University to develop, also can adopt other like products certainly.
The formula of step S2 to total current AC compounent bandpass filtering is I
x(n)
bP=(∑ I
x(n-i) × a
i), i=(0 ~ 24), a
0~ a
24value 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), I
x(n)
bPfor the total current AC compounent after bandpass filtering.
The method of step S3 relative humidity checking meets formula R
h<30%.
The formula of step S4 derivation voltage fundamental component is U
x(n)
bP=(-jI
x(n)
bP)/(ω C), U
x(n)
bPfor voltage fundamental component ,-j represents 90 °, voltage delay electric current, and ω represents angular frequency, and C represents electric capacity.
Step S5 to extract under different relative humidity voltage in the same time and leakage current phase information mutually
with
Step S6 calculates the phase differential of voltage and leakage current under different relative humidity
Simultaneously the method for step S7 relative humidity checking meets following two formula: 65%<R
h<95%, Δ R
h>=20%, Δ R
hrepresent that relative humidity is poor.
Step S8 is according to phase differential
with relative humidity difference Δ R
hthe formula of calculating K value is
Step S9 inquires about the form of K value and gradation for surface pollution, and the chart of phase differential and gradation for surface pollution obtains through testing in testing laboratory.See table 1, table 1 is the form of K value and gradation for surface pollution.Such as, the form of phase differential and gradation for surface pollution can be tested at Wuhan University's high voltage and Insulation Test room and obtain.
Step S10 obtains pollution severity of insulators grade, and insulator contamination grade is divided into a, b, c, d, e five grades.
The invention proposes does not need measurement voltage signal and the method obtaining voltage-phase, by working as R
hduring <30%, insulator can be equivalent to this characteristic of capacitive reactances, extrapolates the first-harmonic of voltage according to filtered leakage current fundametal compoment.
Table 1
| K | 0～1 | 1～2.5 | 2.5～5 | 5～9 | 9～15 |
| Gradation for surface pollution | a | b | c | d | e |
Below embodiment is to invention has been detailed description by reference to the accompanying drawings, and those skilled in the art can make many variations example to the present invention according to the above description.Thus, some details in embodiment should not form limitation of the invention, the present invention by the scope that defines using appended claims as protection scope of the present invention.
Claims (5)
1. the insulator contamination grade monitoring method based on leakage current phase differential, it is characterized in that: it is undertaken by following 4 steps: data acquisition and processing (DAP), voltage fundamental component is derived, and leakage current phase difference calculating is finally the calculating of K value and the acquisition of gradation for surface pollution.
2. a kind of insulator contamination grade monitoring method based on leakage current phase differential according to claim 1, it is characterized in that, described data acquisition and processing (DAP) (1) comprises following two steps:
S1: monitoring device synchronous acquisition leakage current I
xthe relative humidity R of (n) and environment
h;
S2: to leakage current bandpass filtering, the wherein N number of point of each periodic sampling of leakage current in step S1, N>=128, obtain discrete total current function I
x(n), n value 0 ~ N, every leakage current waveform and relative air humidity R getting a synchronous acquisition for 48 hours
hdata; The formula of step S2 leakage current bandpass filtering is I
x(n)
bP=(∑ I
x(n-i) × a
i), i=(0 ~ 24), a
0~ a
24value 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), I
x(n)
bPfor the leakage current fundametal compoment after bandpass filtering.
3. a kind of insulator contamination grade monitoring method based on leakage current phase differential according to claim 1, it is characterized in that, the derivation (2) of described voltage fundamental component comprises following two steps:
S3: relative humidity is verified;
S4: derive voltage fundamental component;
Wherein the method for step S3 relative humidity checking meets formula R
h<30%; The formula of S4 derivation voltage fundamental component is U
x(n)
bP=(-jI
x(n)
bP)/(ω C), U
x(n)
bPfor voltage fundamental component ,-j represents 90 °, voltage delay electric current, and ω represents angular frequency, and C represents electric capacity.
4. a kind of insulator contamination grade monitoring method based on leakage current phase differential according to claim 1, it is characterized in that, the calculating (3) of described leakage current phase differential comprises following two steps:
S5: the phase information extracting under different relative humidity mutually voltage and leakage current in the same time;
S6: the phase differential of calculating voltage and leakage current;
Wherein in step S6, the formula of phase differential is
for leakage current phase differential,
represent the phase place of voltage,
represent the phase place of electric current.
5. a kind of insulator contamination grade monitoring method based on leakage current phase differential according to claim 1, is characterized in that, the calculating of described K value and the acquisition (4) of gradation for surface pollution comprise following part:
S7: relative humidity is verified;
The calculating of S8:K value;
S9: the form of inquiry K value and gradation for surface pollution;
S10: obtain pollution severity of insulators grade;
Wherein simultaneously the method for S7 relative humidity checking meets following two formula: 65%<R
h<95%, △ R
h>=20%, △ R
hrepresent that relative humidity is poor; In S8, the formula of K value is
in S10, insulator contamination grade is divided into a, b, c, d, e five grades.
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|---|---|---|---|
| CN201510430721.0A CN105116223B (en) | 2015-07-21 | 2015-07-21 | A kind of insulator contamination grade monitoring method based on leakage current phase difference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510430721.0A CN105116223B (en) | 2015-07-21 | 2015-07-21 | A kind of insulator contamination grade monitoring method based on leakage current phase difference |
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| CN105116223B CN105116223B (en) | 2018-10-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967602A (en) * | 2019-11-28 | 2020-04-07 | 南方电网科学研究院有限责任公司 | Composite insulator aging degree evaluation method, device, equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101661076B (en) * | 2009-09-04 | 2011-07-20 | 重庆大学 | Method for detecting pollution grade of insulator |
| CN102809568A (en) * | 2012-08-28 | 2012-12-05 | 广东电网公司佛山供电局 | Method and system for monitoring contamination distribution of insulator |
| CN202886471U (en) * | 2012-10-30 | 2013-04-17 | 河南中分仪器股份有限公司 | Multi-channel leakage current phase difference detection equipment |
| CN103411970A (en) * | 2013-07-17 | 2013-11-27 | 同济大学 | Alternating current transmission line insulator contamination condition detection method based on infrared thermography |
| CN103411980A (en) * | 2013-07-23 | 2013-11-27 | 同济大学 | External insulation filth status identification method based on visible-light images |
| CN103604976B (en) * | 2013-11-19 | 2016-05-04 | 国家电网公司 | The inner current in resistance property measuring method of electric transmission line isolator |
| CN104316851A (en) * | 2014-10-30 | 2015-01-28 | 国网上海市电力公司 | Method and device for automatically monitoring pollution of line insulators |
| CN104898031A (en) * | 2015-05-29 | 2015-09-09 | 三峡大学 | Method for identifying pollution discharge intensity of suspension porcelain insulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967602A (en) * | 2019-11-28 | 2020-04-07 | 南方电网科学研究院有限责任公司 | Composite insulator aging degree evaluation method, device, equipment and storage medium |
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