CN104062420A - Method for evaluating aging state of insulation paper in running power transformer - Google Patents
Method for evaluating aging state of insulation paper in running power transformer Download PDFInfo
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- CN104062420A CN104062420A CN201410314162.2A CN201410314162A CN104062420A CN 104062420 A CN104062420 A CN 104062420A CN 201410314162 A CN201410314162 A CN 201410314162A CN 104062420 A CN104062420 A CN 104062420A
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- transformer
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- furfural content
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Abstract
The invention discloses a method for evaluating the aging state of insulation paper in a running power transformer. The method comprises the steps that total quantity of furfural produced by solid insulation when the degree of polymerization of the insulation paper in the running transformer is lowered to be the limit value is set, wherein the total quantity of furfural comprises the total quantity of furfural produced in transformer oil after solid insulation aging, the total quantity of furfural in the insulation paper and the total quantity of furfural removed from the transformer oil in a filtered mode when the transformer is overhauled; the aging state of the insulation paper in the running power transformer is evaluated by calculating the total quantity of the furfural produced in the transformer oil after solid insulation aging. The method for evaluating the aging state of the insulation paper in the running power transformer can evaluate the transformer solid insulation aging state in a non-power-off state, and has the advantages of being simple, direct, convenient to implement, effective and the like.
Description
Technical field
The present invention relates to a kind of appraisal procedure of electric power transformer insulated paper ageing state in service, belong to POWER SYSTEM STATE assessment technique field.
Background technology
The most direct method of solid insulation health status assessment is to adopt the insulating paper of getting in transformer to carry out the measurement of the degree of polymerization at present.But the operability of the method is very poor, obtain sample process and must have a power failure, drain the oil, solid insulation system is had to wound, sampling finishes rear sampling place and must repair and strengthen.Use the appraisal procedure of electric power transformer insulated paper ageing state in service of the present invention under non-power down mode, to carry out the assessment of solid insulation ageing state and residual life, to the life-cycle management of grid equipment, provide effective technical support.
Summary of the invention
Object: in order to overcome the deficiencies in the prior art, the invention provides a kind of appraisal procedure of electric power transformer insulated paper ageing state in service, relate to the parameters such as furfural content that the furfural content in transformer oil and the furfural content in insulating paper after the gross mass, solid insulation ageing of insulating paper in the furfural content, transformer of transformer oil in power transformer in service, transformer oil in service absorbed after filtering.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:
An appraisal procedure for electric power transformer insulated paper ageing state in service, is characterized in that: under non-power down mode, transformer solid insulation ageing state is carried out to analysis and evaluation.
The appraisal procedure of described in service electric power transformer insulated paper ageing state, it is characterized in that: extrapolate when in operating transformer, the degree of polymerization of insulating paper drops to ultimate value, the furfural total amount that solid insulation produces, be furfural total amount that solid insulation produces when reaching certain value, can judge that in power transformer, insulating paper is completely aging.
The appraisal procedure of described in service electric power transformer insulated paper ageing state, it is characterized in that: transformer insulating paper ageing state is judged by measuring the degree of polymerization of insulating paper, this appraisal procedure is converted to directly passes through calculating transformer oil furfural content, assesses electric power transformer insulated paper ageing state.
Because the insulating paper sampling link of transformer in service is complicated, and easily affect transformer insulated system, take sample and also must repair, not easy to operate; The method can directly be carried out the measurement of transformer oil furfural content, convenient and simple.
The appraisal procedure of described in service electric power transformer insulated paper ageing state, is characterized in that: the furfural total amount Q that when degree of polymerization of insulating paper drops to ultimate value in setting operating transformer, solid insulation produces
always; Furfural total amount Q
alwayscomprise three parts, the one, the furfural content Q after solid insulation ageing in transformer oil
oil, the 2nd, the furfural content Q in insulating paper
paper, the 3rd, the transformer oil furfural content Q that mode is removed after filtration in Repair of Transformer process
filter, i.e. Q
always=Q
oil+ Q
paper+ Q
filter.
The appraisal procedure of described in service electric power transformer insulated paper ageing state, is characterized in that, comprises the following steps:
1) degree of polymerization of setting electric power transformer insulated paper in service is ultimate value when dropping to 250, and, when furfural content in transformer oil is greater than 4 mg/L, insulating paper is completely aging, and transformer integral insulation level, in late period in life-span, is designated as Q
always=4 mg/L;
2) insulating paper of Yi1kg unit calculates, a certain amount of new insulating paper is immersed in the transformer oil of known furfural content, set the different time and carry out transformer oil furfural content mensuration, when the furfural content recording is during without significant change, calculate the absorptance of insulating paper to furfural in oil, thereby calculate the adsorbable furfural content of 1kg insulating paper, be designated as the furfural content Q in insulating paper
paper;
3) utilize existing old transformer, the furfural that adds aimed concn, the various maintenance processes of draining the oil that relate to of analogue transformer, adopt respectively dissimilar oil filtering unit to carry out oil strain to this transformer, then carry out furfural content mensuration, with aimed concn, deduct the furfural content after oil strain, be the transformer oil furfural content Q that mode is removed after filtration in Repair of Transformer process
filter;
4) basis: Q
always=Q
oil+ Q
paper+ Q
filter,transformation for mula obtains: Q
oil=Q
always-Q
paper-Q
filter; Due to Q
alwaysfor fixed value, Q
paper, Q
filtermeasure, the furfural content Q in transformer oil after solid insulation ageing
oilcan determine;
5) Q calculating by above step
oilbe the furfural content in transformer oil after solid insulation ageing.
6) therefore, in transformer state evaluation procedure, as long as the furfural content recording in transformer oil reaches Q
oilabove, be judged to be the integral insulation level of this transformer in late period in life-span, should take corresponding maintenance measure.
Beneficial effect: the appraisal procedure of electric power transformer insulated paper ageing state in service provided by the invention, replace getting measurement that insulating paper in transformer carries out the degree of polymerization and evaluated the method for firmware insulation health status, can under non-power down mode, carry out the assessment of solid insulation ageing state and residual life, simple, convenient effective.The appraisal procedure of electric power transformer insulated paper ageing state of the present invention has solved gets insulating paper and surveys that degree of polymerization operation is poor, the difficult point of operation very complicated, there is features such as evaluating more accurately firmware insulated aging life-span, for electric power netting safe running provides strong technical support.
Embodiment
Below in conjunction with specific embodiment, the present invention is further described.
An appraisal procedure for electric power transformer insulated paper ageing state in service, comprises the following steps:
1) degree of polymerization of setting electric power transformer insulated paper in service is ultimate value when dropping to 250, and, when furfural content in transformer oil is greater than 4 mg/L, insulating paper is completely aging, and transformer integral insulation level, in late period in life-span, is designated as Q
always=4 mg/L;
2) insulating paper of Yi1kg unit calculates, a certain amount of new insulating paper is immersed in the transformer oil of known furfural content, set the different time and carry out transformer oil furfural content mensuration, when the furfural content recording is during without significant change, calculate the absorptance of insulating paper to furfural in oil, thereby calculate the adsorbable furfural content of 1kg insulating paper, be designated as the furfural content Q in insulating paper
paper;
3) utilize existing old transformer, the furfural that adds aimed concn, the various maintenance processes of draining the oil that relate to of analogue transformer, adopt respectively dissimilar oil filtering unit to carry out oil strain to this transformer, then carry out furfural content mensuration, with aimed concn, deduct the furfural content after oil strain, be the transformer oil furfural content Q that mode is removed after filtration in Repair of Transformer process
filter;
4) basis: Q
always=Q
oil+ Q
paper+ Q
filter,transformation for mula obtains: Q
oil=Q
always-Q
paper-Q
filter; Due to Q
alwaysfor fixed value, Q
paper, Q
filtermeasure, the furfural content Q in transformer oil after solid insulation ageing
oilcan determine;
5) Q calculating by above step
oilbe the furfural content in transformer oil after solid insulation ageing.
6) therefore, in transformer state evaluation procedure, as long as the furfural content recording in transformer oil reaches Q
oilabove, be judged to be the integral insulation level of this transformer in late period in life-span, should take corresponding maintenance measure.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. an appraisal procedure for electric power transformer insulated paper ageing state in service, is characterized in that: under non-power down mode, transformer solid insulation ageing state is carried out to analysis and evaluation.
2. the appraisal procedure of electric power transformer insulated paper ageing state in service according to claim 1, it is characterized in that: extrapolate when in operating transformer, the degree of polymerization of insulating paper drops to ultimate value, the furfural total amount that solid insulation produces, be furfural total amount that solid insulation produces when reaching certain value, can judge that in power transformer, insulating paper is completely aging.
3. the appraisal procedure of electric power transformer insulated paper ageing state in service according to claim 2, it is characterized in that: transformer insulating paper ageing state is judged by measuring the degree of polymerization of insulating paper, this appraisal procedure is converted to directly passes through calculating transformer oil furfural content, assesses electric power transformer insulated paper ageing state.
4. the appraisal procedure of electric power transformer insulated paper ageing state in service according to claim 3, is characterized in that: the furfural total amount Q that when degree of polymerization of insulating paper drops to ultimate value in setting operating transformer, solid insulation produces
always; Furfural total amount Q
alwayscomprise three parts, the one, the furfural content Q after solid insulation ageing in transformer oil
oil, the 2nd, the furfural content Q in insulating paper
paper, the 3rd, the transformer oil furfural content Q that mode is removed after filtration in Repair of Transformer process
filter, i.e. Q
always=Q
oil+ Q
paper+ Q
filter.
5. the appraisal procedure of electric power transformer insulated paper ageing state in service according to claim 4, is characterized in that, comprises the following steps:
1) degree of polymerization of setting electric power transformer insulated paper in service is ultimate value when dropping to 250, and, when furfural content in transformer oil is greater than 4 mg/L, insulating paper is completely aging, and transformer integral insulation level, in late period in life-span, is designated as Q
always=4 mg/L;
2) insulating paper of Yi1kg unit calculates, a certain amount of new insulating paper is immersed in the transformer oil of known furfural content, set the different time and carry out transformer oil furfural content mensuration, when the furfural content recording is during without significant change, calculate the absorptance of insulating paper to furfural in oil, thereby calculate the adsorbable furfural content of 1kg insulating paper, be designated as the furfural content Q in insulating paper
paper;
3) utilize existing old transformer, the furfural that adds aimed concn, the various maintenance processes of draining the oil that relate to of analogue transformer, adopt respectively dissimilar oil filtering unit to carry out oil strain to this transformer, then carry out furfural content mensuration, with aimed concn, deduct the furfural content after oil strain, be the transformer oil furfural content Q that mode is removed after filtration in Repair of Transformer process
filter;
4) basis: Q
always=Q
oil+ Q
paper+ Q
filter,transformation for mula obtains: Q
oil=Q
always-Q
paper-Q
filter; Due to Q
alwaysfor fixed value, Q
paper, Q
filtermeasure, the furfural content Q in transformer oil after solid insulation ageing
oilcan determine;
5) Q calculating by above step
oilbe the furfural content in transformer oil after solid insulation ageing;
6) therefore, in transformer state evaluation procedure, as long as the furfural content recording in transformer oil reaches Q
oilabove, be judged to be the integral insulation level of this transformer in late period in life-span, should take corresponding maintenance measure.
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| CN201410314162.2A CN104062420B (en) | 2014-07-04 | 2014-07-04 | The appraisal procedure of electric power transformer insulated paper ageing state in a kind of operation |
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| CN201410314162.2A CN104062420B (en) | 2014-07-04 | 2014-07-04 | The appraisal procedure of electric power transformer insulated paper ageing state in a kind of operation |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502488A (en) * | 2015-01-06 | 2015-04-08 | 国家电网公司 | Method for evaluating insulation aging degree of oil-immersed type power transformer |
| CN105784977A (en) * | 2016-05-11 | 2016-07-20 | 林光琴 | Insulation paper aging performance judging method of power transformer |
| CN105866390A (en) * | 2016-06-21 | 2016-08-17 | 林光琴 | Evaluation method for insulating properties of power transformer |
| CN106124701A (en) * | 2016-06-21 | 2016-11-16 | 林光琴 | Power transformer performance monitoring system |
| CN106199234A (en) * | 2016-06-22 | 2016-12-07 | 国家电网公司 | A kind of transformator residual life detection method based on health index |
| CN108802581A (en) * | 2018-06-14 | 2018-11-13 | 国网江苏省电力有限公司电力科学研究院 | Transformer solid insulation aging assessment based on furfural balance model |
| CN108872101A (en) * | 2018-05-10 | 2018-11-23 | 广东电网有限责任公司电力科学研究院 | A kind of appraisal procedure and detection system of transformer degree of aging |
| CN110553977A (en) * | 2019-10-18 | 2019-12-10 | 云南电网有限责任公司电力科学研究院 | Method for judging aging of insulating paper in transformer insulating oil |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502488A (en) * | 2015-01-06 | 2015-04-08 | 国家电网公司 | Method for evaluating insulation aging degree of oil-immersed type power transformer |
| CN105784977A (en) * | 2016-05-11 | 2016-07-20 | 林光琴 | Insulation paper aging performance judging method of power transformer |
| CN105866390A (en) * | 2016-06-21 | 2016-08-17 | 林光琴 | Evaluation method for insulating properties of power transformer |
| CN106124701A (en) * | 2016-06-21 | 2016-11-16 | 林光琴 | Power transformer performance monitoring system |
| CN105866390B (en) * | 2016-06-21 | 2017-12-29 | 江苏惠聪科技有限公司 | Electric power transformer insulated method of evaluating performance |
| CN106199234A (en) * | 2016-06-22 | 2016-12-07 | 国家电网公司 | A kind of transformator residual life detection method based on health index |
| CN108872101A (en) * | 2018-05-10 | 2018-11-23 | 广东电网有限责任公司电力科学研究院 | A kind of appraisal procedure and detection system of transformer degree of aging |
| CN108802581A (en) * | 2018-06-14 | 2018-11-13 | 国网江苏省电力有限公司电力科学研究院 | Transformer solid insulation aging assessment based on furfural balance model |
| CN110553977A (en) * | 2019-10-18 | 2019-12-10 | 云南电网有限责任公司电力科学研究院 | Method for judging aging of insulating paper in transformer insulating oil |
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