CN105301417A - Assessment method for insulating property of mossed and moldy composite insulator for converter station/transformer station - Google Patents
Assessment method for insulating property of mossed and moldy composite insulator for converter station/transformer station Download PDFInfo
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- CN105301417A CN105301417A CN201510873264.2A CN201510873264A CN105301417A CN 105301417 A CN105301417 A CN 105301417A CN 201510873264 A CN201510873264 A CN 201510873264A CN 105301417 A CN105301417 A CN 105301417A
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- composite insulator
- insulating property
- mouldy
- tongue
- insulation resistance
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Abstract
The invention discloses an assessment method for insulating property of a mossed and moldy composite insulator for a converter station/transformer station. The assessment method is used for detecting the insulating property of the mossed or moldy zone on the surface of a composite insulator, and includes the steps: utilizing a water spray grading method to detect the surface hydrophobicity grading of the composite insulator and the corresponding area of zone, and dividing the surface hydrophobicity state into seven grades; utilizing a megohmmeter or an insulation resistance meter to measure the insulation resistance of 1-3 pieces of composite insulator umbrella skirts under the drying and mosit conditions; and according to the measurement results of the above two steps, assessing the insulating property of the mossed or moldy composite insulator. As the measurement method is simple and the measurement tool is simple operation, the measurement method can be performed under the field condition of a converter station or a transformer station; and when the hydrophobicity of more than 50% of the mossed or moldy composite insulator is reduced to be less than HC5 or the insulation resistance of single piece of umbrella skirt is less than 1G/piece, cleaning and subsequent detection work for the composite insulator can be arranged.
Description
Technical field
The present invention relates to current conversion station/transformer station's high pressure primary equipment repair and maintenance field, be specifically related to a kind of current conversion station/power transformation and stand the appraisal procedure of the mouldy composite insulator insulating property of tongue.
Background technology
2014 ~ 2015 years, south electric network inspection travel personnel found that equipment tongue green for a long time, the phenomenon such as mouldy appear in some current conversion station porcelain insulator, composite insulator and compound insulating sleeve.Investigation finds, insulator arrangement surface is played tongue Signs of Mould and at home and abroad all happened occasionally.In Dec, 2010, when south electric network exchanges 500kV line outage maintenance, discovery part anchor support glass insulator upper and lower surface all length has liver moss, and lower surface is comparatively serious; Confirm through field staff, the more difficult cleaning of liver moss of insulator surface is clean; In national grid region there is similar phenomenon in Sichuan Electric Power Network.Worldwide, the country such as the U.S., Switzerland, Sri Lanka, Tanzania, Colombia, Uruguay, New Zealand and Australia has all found Similar Problems.The national researchist such as Switzerland, the U.S. carries out systematic Study to this problem from the nineties, mainly comprise type and the formation condition of the biological contamination of insulator, biological contamination is on the prophylactico-therapeutic measures of the impact of equipment and the biological contamination of insulator and feasible direction etc.Domestic electrical and the research of scientific research institution to this problem less, rarely have report.Therefore, to playing the mouldy insulator of tongue, especially the evaluation measures of compound insulating sublayer performance is very limited.
Summary of the invention
Technical matters to be solved by this invention is: provide the appraisal procedure that a kind of current conversion station/power transformation stands the mouldy composite insulator insulating property of tongue.
The solution of above-mentioned technical matters, realize by following technical scheme: a kind of current conversion station/power transformation stands the appraisal procedure of the mouldy composite insulator insulating property of tongue, for detecting the insulating property playing tongue or mouldy region of surface of composite insulator, comprise the steps:
Step one: adopt water spray stage method to detect the surface hydrophobicity classification of composite insulator and the region area of correspondence, the hydrophobic nature state of surface of composite insulator is divided into seven grades, be expressed as HC1 ﹑ HC2 ﹑ HC3 ﹑ HC4 ﹑ HC5 ﹑ HC6 and HC7, the wherein corresponding best hydrophobic nature of HC1, the poorest hydrophobic nature of HC7 correspondence, i.e. total hydrophilic;
Step 2: adopt megohmmeter or insulation resistance meter to measure the insulation resistance of 1 ~ 3 composite insulator umbrella skirt under drying condition and wet condition;
Step 3: assessed tongue or mouldy composite insulator insulating property according to the measurement result of above-mentioned two steps, hydrophobic nature classification is divided into three grades:
The rank of the first order is zero level, meets following two conditions
The hydrophobic nature of (i) this rank be HC1 ~ HC2 level 100% play tongue or mouldy region area, HC3 ~ HC4 level not higher than 50% play tongue or mouldy region area,
(ii) insulation resistance under drying condition and wet condition is >=50G/ sheet composite insulator;
Then judge that composite insulator insulating property meet the demands, composite insulator continues to run;
The rank of the second level is one-level, meets following two conditions
The hydrophobic nature of (i) this rank be HC3 ~ HC4 level 100% play tongue or mouldy region area, HC5 level below not higher than 50% play tongue or mouldy region area,
(ii) insulation resistance under drying condition and wet condition is 1 ~ 50G/ sheet composite insulator;
Then judge that composite insulator insulating property meet the demands substantially, under the prerequisite of periodic detection, composite insulator continues to run;
The rank of the third level is secondary, meets following two conditions
The hydrophobic nature of (i) this rank be below HC5 level higher than 50% play tongue or mouldy region area,
(ii) insulation resistance is in a wetted condition≤1G/ sheet composite insulator;
Then judge that composite insulator insulating property do not meet the demands, composite insulator is out of service.
Hydrophobic nature is the hallmark characteristic of composite insulator.The insulating property of composite insulator generally comprise a series of indexs such as hydrophobic nature, insulation resistance, voltage breakdown, creepage trace index.It is generally acknowledged that the forfeiture of hydrophobic nature can cause the degradation of insulation resistance, but decline degree depends on the lost degree of hydrophobic nature.Therefore, there is complementary relation during the measurement of the measurement of insulation resistance and hydrophobic nature.
Major technique innovative content of the present invention comprises:
1, the insulating property that the method adopting hydrophobic nature detection and insulation measurement to combine has judged tongue, mouldy composite insulator are proposed;
2, its principle is, microbial adhesion region composite insulator hydrophobicity and insulation resistance all there will be decline, and fall depends on microorganism type and adhesion amount, and the hydrophobic nature of non-adhering zone then changes not quite;
3, show that the Hydrophobicity of Composite Insulator in mouldy region can be lost by research.
The present invention has following beneficial effect: this appraisal procedure is by means of only the insulating property of the hydrophobic nature and insulation resistance assessment insulator of measuring mouldy tongue composite insulator, measuring method is simple, testing tool is easy and simple to handle, can implement under current conversion station or substation field condition, when rise insulation resistance that tongue or the above hydrophobic nature of mouldy insulator 50% region area drop to below HC5 or monolithic full skirt below 1G/ sheet time, cleaning and the subsequent detection work of composite insulator can be arranged.
Accompanying drawing explanation
Fig. 1 is that insulation resistance of the present invention detects schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical scheme of the present invention is described in detail.
Embodiment:
Current conversion station/power transformation stands the appraisal procedures of the mouldy composite insulator insulating property of tongue, for detecting the insulating property playing tongue or mouldy region of surface of composite insulator, comprises the steps:
Step one: adopt water spray stage method to detect the surface hydrophobicity classification of composite insulator and the region area of correspondence, the hydrophobic nature state of surface of composite insulator is divided into seven grades, be expressed as HC1 ﹑ HC2 ﹑ HC3 ﹑ HC4 ﹑ HC5 ﹑ HC6 and HC7, the wherein corresponding best hydrophobic nature of HC1, the poorest hydrophobic nature of HC7 correspondence, i.e. total hydrophilic, in test process, sprinkler can use watering can;
Step 2: adopt megohmmeter or insulation resistance meter to measure the insulation resistance of 1 ~ 3 composite insulator umbrella skirt under drying condition and wet condition;
Step 3: assessed tongue or mouldy composite insulator insulating property according to the measurement result of above-mentioned two steps, hydrophobic nature classification is divided into three grades:
The rank of the first order is zero level, meets following two conditions
The hydrophobic nature of (i) this rank be HC1 ~ HC2 level 100% play tongue or mouldy region area, HC3 ~ HC4 level not higher than 50% play tongue or mouldy region area,
(ii) insulation resistance under drying condition and wet condition is >=50G/ sheet composite insulator;
Then judge that composite insulator insulating property meet the demands, composite insulator continues to run;
The rank of the second level is one-level, meets following two conditions
The hydrophobic nature of (i) this rank be HC3 ~ HC4 level 100% play tongue or mouldy region area, HC5 level below not higher than 50% play tongue or mouldy region area,
(ii) insulation resistance under drying condition and wet condition is 1 ~ 50G/ sheet composite insulator;
Then judge that composite insulator insulating property meet the demands substantially, under the prerequisite of periodic detection, composite insulator continues to run;
The rank of the third level is secondary, meets following two conditions
The hydrophobic nature of (i) this rank be below HC5 level higher than 50% play tongue or mouldy region area,
(ii) insulation resistance is in a wetted condition≤1G/ sheet composite insulator;
Then judge that composite insulator insulating property do not meet the demands, composite insulator is out of service.
A tongue in the present embodiment or mouldy region comprise algae, fungi/mould, bacterium and liver moss phenomenon.
Sprinkler in the present embodiment should be about 25cm, water spray per second 1 time, totally 25 times apart from the insulator umbrella playing tongue or mouldy region, and each injection flow rate is 0.7 ~ 1ML; Under after water spray, insulator surface should have water shunting.Injection direction is as far as possible perpendicular to subject surface, and the reading of hydrophobic nature classification HC value should complete in 30s after water spray terminates.
By choosing 1 ~ 3 full skirt playing tongue or mouldy compound inslation subregion as product to be tested, adopt bare copper wire around being close at compound inslation sub bar footpath place, as test electrode; Use insulation resistance meter or megohmmeter to be adjusted to corresponding gear and measure the insulation resistance of product to be tested under drying and wet condition respectively, compound inslation full skirt under wet condition adopts available water conductivity 300 μ S/cm spray product to be tested surface has water droplet to flow down to full skirt surface, insulation measurement adopts megohmmeter or insulation resistance meter, and measurement range is not less than 1 × 10
6~ 1 × 10
15Ω, the present embodiment is by having illustrated the appraisal procedure of the insulating property of tongue or mouldy compound inslation subregion as following table 1.
The evaluation criteria playing tongue mouldy composite insulator insulating property in the present invention is as shown in table 1.The order of severity playing tongue mouldy is divided into three grades, is respectively zero level, firsts and seconds.This appraisal procedure adopts composite insulator umbrella skirt surface to play tongue or mouldy region area, hydrophobicity rank and the insulation resistance standard as classification.Especially, if composite insulator plays tongue or mouldy state is in secondary, then tested composite insulator should take the measures such as cleaning or replacing.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and this embodiment is also not used to limit the scope of the claims of the present invention, does not allly depart from the equivalence that type of the present invention does and implements or change, and all should be contained in the scope of the claims of this case.
Claims (3)
1. current conversion station/power transformation stands an appraisal procedure for the mouldy composite insulator insulating property of tongue, for detecting the insulating property playing tongue or mouldy region of surface of composite insulator, it is characterized in that, comprise the steps:
Step one: adopt water spray stage method to detect the surface hydrophobicity classification of composite insulator and the region area of correspondence, the hydrophobic nature state of surface of composite insulator is divided into seven grades, be expressed as HC1 ﹑ HC2 ﹑ HC3 ﹑ HC4 ﹑ HC5 ﹑ HC6 and HC7, the wherein corresponding best hydrophobic nature of HC1, the poorest hydrophobic nature of HC7 correspondence, i.e. total hydrophilic;
Step 2: adopt megohmmeter or insulation resistance meter to measure the insulation resistance of 1 ~ 3 composite insulator umbrella skirt under drying condition and wet condition;
Step 3: assessed tongue or mouldy composite insulator insulating property according to the measurement result of above-mentioned two steps, hydrophobic nature classification is divided into three grades:
The rank of the first order is zero level, meets following two conditions
The hydrophobic nature of (i) this rank be HC1 ~ HC2 level 100% play tongue or mouldy region area, HC3 ~ HC4 level not higher than 50% play tongue or mouldy region area,
(ii) insulation resistance under drying condition and wet condition is >=50G/ sheet composite insulator;
Then judge that composite insulator insulating property meet the demands, composite insulator continues to run;
The rank of the second level is one-level, meets following two conditions
The hydrophobic nature of (i) this rank be HC3 ~ HC4 level 100% play tongue or mouldy region area, HC5 level below not higher than 50% play tongue or mouldy region area,
(ii) insulation resistance under drying condition and wet condition is 1 ~ 50G/ sheet composite insulator;
Then judge that composite insulator insulating property meet the demands substantially, under the prerequisite of periodic detection, composite insulator continues to run;
The rank of the third level is secondary, meets following two conditions
The hydrophobic nature of (i) this rank be below HC5 level higher than 50% play tongue or mouldy region area,
(ii) insulation resistance is in a wetted condition≤1G/ sheet composite insulator;
Then judge that composite insulator insulating property do not meet the demands, composite insulator is out of service.
2. a kind of current conversion station/power transformation according to claim 1 stands the appraisal procedure of the mouldy composite insulator insulating property of tongue, and it is characterized in that, described tongue or mouldy region comprise algae, fungi/mould, bacterium and liver moss phenomenon.
3. a kind of current conversion station/power transformation according to claim 1 stands the appraisal procedure of the mouldy composite insulator insulating property of tongue, and it is characterized in that, described megohmmeter or insulation resistance meter measurement range are not less than 1 × 10
6~ 1 × 10
15Ω.
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| CN201510873264.2A CN105301417A (en) | 2015-12-01 | 2015-12-01 | Assessment method for insulating property of mossed and moldy composite insulator for converter station/transformer station |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106546511A (en) * | 2016-11-25 | 2017-03-29 | 国网河南省电力公司漯河供电公司 | Transmission line of electricity sulphurated siliastic coating method for detecting hydrophobic |
| CN107543821A (en) * | 2017-09-07 | 2018-01-05 | 国网四川省电力公司电力科学研究院 | A kind of insulator algal grown degree assessment method |
| CN108267168A (en) * | 2017-12-20 | 2018-07-10 | 国网江西省电力有限公司电力科学研究院 | A kind of method of epoxy group insulating part performance in evaluation high-tension switch cabinet |
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| CN2170529Y (en) * | 1993-09-20 | 1994-06-29 | 东北电力学院 | Isolator string low-zero magnetic bottle detector |
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Cited By (4)
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| CN106546511A (en) * | 2016-11-25 | 2017-03-29 | 国网河南省电力公司漯河供电公司 | Transmission line of electricity sulphurated siliastic coating method for detecting hydrophobic |
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| CN107543821B (en) * | 2017-09-07 | 2020-05-05 | 国网四川省电力公司电力科学研究院 | Insulator algae growth degree assessment method |
| CN108267168A (en) * | 2017-12-20 | 2018-07-10 | 国网江西省电力有限公司电力科学研究院 | A kind of method of epoxy group insulating part performance in evaluation high-tension switch cabinet |
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Application publication date: 20160203 |