CN109581105A - Composite insulator interface performance appraisal procedure based on leakage current change rate - Google Patents
Composite insulator interface performance appraisal procedure based on leakage current change rate Download PDFInfo
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- CN109581105A CN109581105A CN201811433119.2A CN201811433119A CN109581105A CN 109581105 A CN109581105 A CN 109581105A CN 201811433119 A CN201811433119 A CN 201811433119A CN 109581105 A CN109581105 A CN 109581105A
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- leakage current
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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
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The composite insulator interface performance appraisal procedure based on leakage current change rate that the present invention relates to a kind of, is mainly used for the qualitative assessment of composite insulator sample interface performance.It mainly includes leakage current test after DC leakage-current test, boiling, boiling before sampling, boiling, the analysis of leakage current change rate, interface performance assessment.Leakage current test in this method is convenient for carrying out, and time-consuming is shorter, and choosing leakage current change rate of the composite insulator sample before and after boiling is index, can fast and efficiently complete the interface performance assessment of sample.
Description
Technical field
The present invention relates to a kind of methods of composite insulator quality evaluation, in particular for operation compound inslation sub-interface matter
Appraisal procedure measure, based on leakage current change rate.
Background technique
Composite insulator is small in size since its is light-weight, has unique hydrophobicity, is widely used in overhead transmission line
In road, play a part of insulation and fixed conducting wire.According to statistics, to the defeated of China 110kV in 2014 and above
Electric line has had 7,100,000 composite insulators to put into operation.One complete insulator is by silicon rubber umbrella, fiber reinforced plastics rod
It is formed with end metal fitting, there are interfaces between the part of different materials composition, and wherein the interface between umbrella cover and plug is accounting
Maximum and most important part.When the position quality is bad, shelf depreciation may occur in transmission line of electricity operational process, invade
Silicon rubber umbrella and fiber reinforced plastics rod are lost, composite insulator electric property and mechanical performance is caused to decline, is ultimately caused compound exhausted
The fracture of edge, causes electric power accident.
Current value after the leakage current of insulating materials refers to impressed DC voltage, when reaching stable.Engineering in practice
The method of measurement leakage current is commonly used to judge insulation with the presence or absence of degradation phenomena.For composite insulator, if its umbrella cover and core
Interface quality between stick is bad, then moisture can easily pass through boiling test and penetrate into wherein, and insulation resistance is caused to be substantially reduced.Cause
This, can use the variation characteristic of composite insulator boiling front and back leakage current to assess its interface performance.
Summary of the invention
The technical problems to be solved by the invention are exactly to propose that the composite insulator based on leakage current change rate is interface characteristics
Energy appraisal procedure can carry out interface quality assessment to new factory and running composite insulator using this method, in time
It was found that the product of interface quality difference, provides useful information for the selection and replacement of product, guarantees the safe operation of transmission line of electricity.
The technical solution adopted by the present invention is that:
A kind of composite insulator interface performance appraisal procedure based on leakage current change rate, which is characterized in that including with
Lower step:
Step 1 determines the operation composite insulator for needing to carry out interface performance assessment, it is removed from route, measures
Insulated part length, and clean its surface；
Taken composite insulator test product high-voltage end is applied high direct voltage, low-pressure end ground connection by step 2.Added voltage value from
Zero is gradually increased to maximum value, obtains corresponding voltage gradient value according to insulated lengths, and records and stablize under each voltage gradient
When flow through the leakage current of test product；
Test product is put into boiling setting time hour in the sodium chloride of boiling by step 3, is taken out and is simultaneously dried at room temperature to umbrella
Skirt surface is without obvious drop；
Step 4 applies high direct voltage to test product again, repeats step 2；
It is each to calculate boiling front and back for step 5, the leakage current-voltage gradient change curve for making test product before and after boiling
Leakage current change rate Δ I%, calculation method are as follows under voltage gradient
In formula, Δ I% is leakage current change rate, I0For the leakage current values before boiling, I is the leakage current after boiling
Value.
Step 6 is assessed according to interface quality of the interface quality assessment level to product to be tested, and interface quality assessment is quasi-
It is then as follows:
Interface quality is good: Δ I% is respectively less than when voltage gradient 0.5kV/cm, 1kV/cm, 1.5kV/cm, 2kV/cm
0.1；
Interface quality is qualified: 0.1 < Δ I% < 15 when voltage gradient is 0.5kV/cm, and 0.1 when voltage gradient is 1kV/cm
< Δ I% < 8 and 0.1 < Δ I% < 5 and 0.1 < Δ I% < 3 when voltage gradient is 2kV/cm when voltage gradient is 1.5kV/cm；
Interface quality is unqualified: Δ I% when Δ I% >=15 or voltage gradient are 1kV/cm when voltage gradient is 0.5kV/cm
>=85 or voltage gradient Δ I% >=3 when Δ I% >=5 or voltage gradient are 2kV/cm when being 1.5kV/cm.
In the above-mentioned composite insulator interface performance appraisal procedure based on leakage current change rate, the step 2, institute
Making alive maximum value is the value big as far as possible that is taken in the case where guaranteeing that flashover does not occur for test product.Intermediate voltage value is arrived 0
Equally distributed 15~20 points between maximum value.
In the above-mentioned composite insulator interface performance appraisal procedure based on leakage current change rate, the step 3, chlorine
The conductivity for changing sodium solution is 1670 μ of μ S/cm~1830 S/cm at 20 DEG C；
In the above-mentioned composite insulator interface performance appraisal procedure based on leakage current change rate, voltage gradient is equal to
Voltage is divided by the interface length between sheath and plug, the i.e. linear distance of insulated part.Bleeder resistance is equal to the voltage gradient
Under voltage divided by corresponding leakage current.
Therefore, the present invention can efficiently assess composite insulator interface quality, find the product of interface quality difference in time, be
The selection and replacement of product provide useful information, guarantee the safe operation of transmission line of electricity.
Detailed description of the invention
Fig. 1 is detection method flow chart.
Fig. 2 is test product leakage current change rate with voltage gradient change curve.
Specific embodiment
The present invention will be further described with embodiment with reference to the accompanying drawing:
As shown in Figure 1, the composite insulator interface performance appraisal procedure based on leakage current change rate includes the following steps
Step 1 determines the operation composite insulator for needing to carry out interface performance assessment, 3 test products chosen in this example
From certain 110kV route, they are removed to rear clean surface from route, number is No. 1, No. 2 and No. 3 test product respectively
Taken composite insulator test product high-voltage end is applied high direct voltage, low-pressure end ground connection by step 2.Added voltage value from
Zero is gradually increased to 400kV, about takes an electrical voltage point every 20kV, records and flows through letting out for test product when stablizing under each voltage gradient
Leakage current
Step 3 gets out sodium chloride solution, and conductivity is 1680 μ S/cm at 20 DEG C.Test product is put into the chlorine of boiling
Change in sodium boiling 42 hours, then takes out, dried at room temperature to full skirt surface without obvious drop
Step 4 applies high direct voltage to test product again, repeats step 2
Step 5 makes leakage current change rate-voltage gradient change curve before and after every test product boiling respectively, as a result
As shown in Fig. 2, leakage current change rate Δ I% under each voltage gradient after obtaining boiling.It is computed, obtains No. 1 test product Δ I%
| E=0.5kV/cm=0.01, Δ I% | E=1kV/cm=0.01, Δ I% | E=1.5kV/cm=0.01, Δ I% | E=
2kV/cm=0.01, No. 2 test product Δ I% | E=0.5kV/cm=7.65, Δ I% | E=1kV/cm=3.63, Δ I% | E=
1.5kV/cm=2.21, Δ I% | E=2kV/cm=1.48, No. 3 test product Δ I% | E=0.5kV/cm=39.80, Δ I% | E
=1kV/cm=14.66, Δ I% | E=1.5kV/cm=7.94, Δ I% | E=2kV/cm=5.01,
Step 6 is assessed according to according to interface quality of the interface quality assessment level to product to be tested, and interface quality is commented
It is as follows to estimate criterion:
Interface quality is good: Δ I% is respectively less than when voltage gradient 0.5kV/cm, 1kV/cm, 1.5kV/cm, 2kV/cm
0.1；
Interface quality is qualified: 0.1 < Δ I% < 15 when voltage gradient is 0.5kV/cm, and 0.1 when voltage gradient is 1kV/cm
< Δ I% < 8 and 0.1 < Δ I% < 5 and 0.1 < Δ I% < 3 when voltage gradient is 2kV/cm when voltage gradient is 1.5kV/cm
Interface quality is unqualified: Δ I% when Δ I% >=15 or voltage gradient are 1kV/cm when voltage gradient is 0.5kV/cm
>=85 or voltage gradient Δ I% >=3 when Δ I% >=5 or voltage gradient are 2kV/cm when being 1.5kV/cm.
According to test product actual conditions, evaluation result is as follows: No. 1 test product interface quality is good, and No. 2 test product interface qualities close
Lattice, No. 3 test product interface qualities are unqualified.
Claims (4)
1. a kind of composite insulator interface performance appraisal procedure based on leakage current change rate, which is characterized in that including following
Step:
Step 1 determines the operation composite insulator for needing to carry out interface performance assessment, it is removed from route, measurement insulation
Partial-length, and clean its surface；
Step 2, by taken composite insulator test product high-voltage end apply high direct voltage, low-pressure end ground connection, added voltage value from zero according to
It is secondary to increase to maximum value, corresponding voltage gradient value is obtained according to insulated lengths, and record stream when stablizing under each voltage gradient
Cross the leakage current of test product；
Test product is put into time hour that boiling in the sodium chloride of boiling is set by step 3, take out and dry at room temperature to
Full skirt surface is without obvious drop；
Step 4 applies high direct voltage to test product again, repeats step 2
Step 5, the leakage current-voltage gradient change curve for making test product before and after boiling calculate each voltage before and after boiling
Leakage current change rate Δ I%, calculation method are as follows under gradient
In formula, Δ I% is leakage current change rate, I0For the leakage current values before boiling, I is the leakage current values after boiling；
Step 6 is assessed according to interface quality of the interface quality assessment level to product to be tested, and interface quality assessment level is such as
Under:
Interface quality is good: Δ I% is respectively less than 0.1 when voltage gradient 0.5kV/cm, 1kV/cm, 1.5kV/cm, 2kV/cm；
Interface quality is qualified: 0.1 < Δ I% < 15 when voltage gradient is 0.5kV/cm, and 0.1 < Δ when voltage gradient is 1kV/cm
I% < 8 and 0.1 < Δ I% < 5 and 0.1 < Δ I% < 3 when voltage gradient is 2kV/cm when voltage gradient is 1.5kV/cm
Interface quality is unqualified: Δ I% >=85 when Δ I% >=15 or voltage gradient are 1kV/cm when voltage gradient is 0.5kV/cm
Or voltage gradient Δ I% >=3 when Δ I% >=5 or voltage gradient are 2kV/cm when being 1.5kV/cm.
2. the composite insulator interface performance appraisal procedure according to claim 1 based on leakage current change rate,
It is characterized in that, in the step 2, added voltage max is taken most in the case where guaranteeing that flashover does not occur for test product
Big value, intermediate voltage representative value are 0 to 15~20 points equally distributed between maximum value.
3. the composite insulator interface performance appraisal procedure according to claim 1 based on leakage current change rate,
It is characterized in that, in the step 3, the conductivity of sodium chloride solution is 1670 μ of μ S/cm~1830 S/cm at 20 DEG C.
4. the composite insulator interface performance appraisal procedure according to claim 1 based on leakage current change rate,
It is characterized in that, voltage gradient is equal to voltage divided by the interface length between sheath and plug, the i.e. linear distance of insulated part, lets out
Ohmic leakage is equal to the voltage under the voltage gradient divided by corresponding leakage current.
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Cited By (4)
| 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 |
| CN111965097A (en) * | 2020-09-29 | 2020-11-20 | 海南电网有限责任公司电力科学研究院 | Method for evaluating anti-aging performance of new composite insulator in tropical environment |
| CN111965098A (en) * | 2020-09-29 | 2020-11-20 | 海南电网有限责任公司电力科学研究院 | Method for evaluating aging state of composite insulator running in tropical environment |
| CN117347912A (en) * | 2023-12-06 | 2024-01-05 | 清华大学深圳国际研究生院 | Optical fiber insulator interface performance testing device and interface performance evaluation method |
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| CN107797036A (en) * | 2017-10-19 | 2018-03-13 | 广东电网有限责任公司电力科学研究院 | A kind of method based on high voltage and the evaluating combined insulator interface performance of salting liquid |
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| CN111965098A (en) * | 2020-09-29 | 2020-11-20 | 海南电网有限责任公司电力科学研究院 | Method for evaluating aging state of composite insulator running in tropical environment |
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| CN117347912A (en) * | 2023-12-06 | 2024-01-05 | 清华大学深圳国际研究生院 | Optical fiber insulator interface performance testing device and interface performance evaluation method |
| CN117347912B (en) * | 2023-12-06 | 2024-03-22 | 清华大学深圳国际研究生院 | Optical fiber insulator interface performance testing device and interface performance evaluation method |
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