CN102207532A - Oil paper insulation early stage discharge defect diagnosis method - Google Patents
Oil paper insulation early stage discharge defect diagnosis method Download PDFInfo
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- CN102207532A CN102207532A CN2011100581186A CN201110058118A CN102207532A CN 102207532 A CN102207532 A CN 102207532A CN 2011100581186 A CN2011100581186 A CN 2011100581186A CN 201110058118 A CN201110058118 A CN 201110058118A CN 102207532 A CN102207532 A CN 102207532A
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Abstract
The invention discloses an oil paper insulation early stage discharge defect diagnosis method in the field of transformer partial discharge partial discharge monitoring technology in an electric power system. The method comprises collecting a partial discharge pulse signal of a transformer in a signal power frequency period and extracting the number of the pulse, carrying out a statistics towards the phase distribution of the transformer discharge impulse and acquiring the phase distribution range of the pulse, detecting the content of acetylene in the transformer oil, using oil paper insulation early stage discharge defect to set a standard and determining whether the oil paper insulation discharge in the transformer is at an early stage or not. According to the invention, a goal of recognizing early stage partial discharge defects in the transformer is achieved by observing characteristic parameters such as the frequency and phase of the discharge impulse, the gas content in the oil and the like and supports are provided for the state assessment and maintenance of the transformer.
Description
Technical field
The invention belongs to the partial discharge of transformer monitoring technical field of electric system, relate in particular to a kind of paper oil insulation early discharge defect diagnostic method.
Background technology
Paper oil insulation is the built-in electrical insulation ingredient of oil-filled transformer.Oil-filled transformer is the transformer of present main flow.Transformer is the key equipment in the electric system, as the important component part in the power transmission network, is undertaking the vital task that system power is transmitted, and its reliability of operation is directly connected to the safety and stablization of electric system.From transformer damage accident position statistics, Transformer Winding is the main damaged location of transformer damage accident.Shelf depreciation is to cause one of transformer insulated cause faults, because transformer outlet or near region short circuit, structural design are unreasonable, manufacturing process and material control is tight, thunderbolt, internal overvoltage and insulation ag(e)ing and maloperation or install improperly, all can cause the transformer damage accident.A transformer is under working voltage, if having partial discharge phenomenon in expendable insulation, then these faint discharge energies can slowly damage insulation, along with the growth of time, may cause whole insulation breakdown, causes heavy losses.
Insulation fault to transformer carries out partial discharge monitoring, can reflect the insulation degradation situation of transformer inside continuously, in real time, and it is one of important means of grasping transformer insulated situation.And at present people carry out partial discharge monitoring to electrical equipment, can't be well the various characteristic quantities of the local discharge signal order of severity with the insulation fault that is taken place be combined.What can accomplish at present is: according to the regulation of the standard GB 1094.3-2003 " power transformer the 3rd part: dielectric level, Insulation Test and external insulation clearance " of China, the shelf depreciation of the transformer under trial voltage during greater than 300pC or 500pC, can be considered as substandard product at discharge capacity with this transformer.As seen, also do not occur utilize the characteristic parameter of local discharge signal to discern the early stage shelf depreciation defective of transformer inside at present, thereby be difficult to take corresponding maintenance measures at the shelf depreciation defective that is in developing stage.
Summary of the invention
The objective of the invention is to, a kind of paper oil insulation early discharge defect diagnostic method is provided, according to these characteristic parameters of gas content in frequency, phase place and the oil of discharge pulse, the early stage shelf depreciation defective of identification transformer inside.
Technical scheme is that a kind of paper oil insulation early discharge defect diagnostic method is characterized in that described method comprises:
Step 1: gather the partial discharge pulse's signal in the single power frequency period of transformer, extract pulse number;
Step 2: the PHASE DISTRIBUTION to the transformer discharge pulse is added up, and obtains the PHASE DISTRIBUTION scope of pulse;
Step 3: detect acetylene content in the transformer oil;
Step 4: utilize the paper oil insulation early discharge defective criteria for classifying, judge whether the paper oil insulation discharge in the transformer is in commitment.
The described paper oil insulation early discharge defective criteria for classifying specifically is, when satisfying
(1) the discharge pulse quantity of the single power frequency period of transformer is less than 10;
(2) PHASE DISTRIBUTION of transformer discharge pulse is in 0 degree～110 degree and two intervals of 200 degree～310 degree;
(3) detect less than acetylene gas;
In two or two when above, then the discharge of the paper oil insulation in the transformer is in commitment.
The present invention has realized characteristic parameter such as gas content in frequency, phase place and the oil by discharge pulse, the purpose of the early stage shelf depreciation defective of identification transformer inside, the insulation degradation situation that can reflect transformer inside continuously, in real time is for Transformer State Assessment with maintenance provides rationally, support reliably.
Description of drawings
Fig. 1 is a paper oil insulation early discharge defect diagnostic method process flow diagram;
Fig. 2 is the pulse number synoptic diagram in the single power frequency period; Wherein, be that pulse number in the single power frequency period is less than 10 synoptic diagram (a), (b) be pulse number in the single power frequency period is more than 10 synoptic diagram;
Fig. 3 is the impulse phase distribution schematic diagram; Wherein, (a) being the synoptic diagram that impulse phase is in 0 degree～110 degree and two intervals of 200 degree～310 degree, (b) is that impulse phase is in the synoptic diagram outside 0 degree～110 degree and two intervals of 200 degree～310 degree.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation only is exemplary, rather than in order to limit the scope of the invention and to use.
Carry out the whole process monitoring by generation, development and even the final whole process that punctures to shelf depreciation, obtain the development and change rule of local discharge characteristic parameter, the rule of development of characteristic gas content in the frequency of discharge pulse, PHASE DISTRIBUTION feature and the oil particularly, deeply excavate wherein implicit insulation degradation degree information, the criteria for classifying that can obtain to distinguish early defect He be in the defective of Rapid development stage.
In the present invention, the applicant has set up Research on Power Transformer Oil-paper Insulation partial discharge test platform and ball-leaf fat wedge discharging model, post-plate discharging model, horizontal pin-plate discharging model in the laboratory, vertical needle-plate discharging model and turn-to-turn discharging model, adopt conventional pulse current detection method (meeting the GB7354-2003/IEC60270:2000 standard), monitor partial discharge pulse's signal of above-mentioned model, adopt gas chromatography method (meeting the GB7252-2001 standard), study the evolution of the shelf depreciation form of above-mentioned five kinds of common discharging models.Carry out statistical study by frequency, PHASE DISTRIBUTION and characteristic gas content to discharge pulse, the characteristic parameter of above-mentioned five kinds of discharging models and the relation between the defective order of severity have been obtained, obtain the paper oil insulation early discharge defective criteria for classifying, specifically be, when satisfying
(1) the discharge pulse quantity of the single power frequency period of transformer is less than 10;
(2) PHASE DISTRIBUTION of transformer discharge pulse is in 0 degree～110 degree and two intervals of 200 degree～310 degree;
(3) detect less than acetylene gas;
In two or two when above, then the discharge of the paper oil insulation in the transformer is in commitment.
Based on above-mentioned standard, in the insulating monitoring of transformer to be measured, employing meets the Partial discharge detector's device and the detection method of GB7354-2003/IEC60270:2000 standard, inside shelf depreciation defective to transformer is monitored, and the detection method that adopts the GB7252-2001 standard to be recommended is simultaneously carried out the detection of gas ingredients and content in the oil.
Fig. 1 is a paper oil insulation early discharge defect diagnostic method process flow diagram.Among Fig. 1, paper oil insulation early discharge defect diagnostic method comprises:
Step 1: gather the partial discharge pulse's signal in the single power frequency period (20 milliseconds), extract pulse number.
Step 2: the PHASE DISTRIBUTION to discharge pulse is added up, and draws out the statistics spectrogram based on phase place commonly used, and for example pulse frequency-phase place (N-Φ) spectrogram, three-dimensional spectrum (N-Q-Φ spectrogram) etc. are added up spectrogram, obtains the PHASE DISTRIBUTION scope of pulse.
Step 3: detect acetylene content in the transformer oil.
Step 4: utilize the paper oil insulation early discharge defective criteria for classifying, judge whether the paper oil insulation discharge in the transformer is in commitment.
Fig. 2 has showed that the pulse number in the single power frequency period is less than 10 and more than 10 example.Fig. 3 has showed the impulse phase distribution with the form of three-dimensional scatter diagram, wherein, (a) being the synoptic diagram that impulse phase is in 0 degree～110 degree and two intervals of 200 degree～310 degree, (b) is that impulse phase is in the synoptic diagram outside 0 degree～110 degree and two intervals of 200 degree～310 degree.According to Fig. 2 and shown in Figure 3, if the discharge pulse signal number of the single power frequency period of a certain transformer meets Fig. 2 (a), and impulse phase is in 0 degree～110 degree and 200 degree～310 degree two intervals (promptly meeting Fig. 3 (a)), and then the discharge of the paper oil insulation in this transformer is in commitment.And if the discharge pulse signal number of the single power frequency period of a certain transformer meets Fig. 2 (b), and impulse phase is in outside 0 degree～110 degree and two intervals of 200 degree～310 degree (promptly meeting Fig. 3 (b)), then the discharge of the paper oil insulation in this transformer has been in developing stage, should take immediate steps, avoid further developing of transformer oil paper insulation discharge.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (2)
1. paper oil insulation early discharge defect diagnostic method is characterized in that described method comprises:
Step 1: gather the partial discharge pulse's signal in the single power frequency period of transformer, extract pulse number;
Step 2: the PHASE DISTRIBUTION to the transformer discharge pulse is added up, and obtains the PHASE DISTRIBUTION scope of pulse;
Step 3: detect acetylene content in the transformer oil;
Step 4: utilize the paper oil insulation early discharge defective criteria for classifying, judge whether the paper oil insulation discharge in the transformer is in commitment.
2. a kind of paper oil insulation early discharge defect diagnostic method according to claim 1 is characterized in that the described paper oil insulation early discharge defective criteria for classifying specifically is, when satisfying
(1) the discharge pulse quantity of the single power frequency period of transformer is less than 10;
(2) PHASE DISTRIBUTION of transformer discharge pulse is in 0 degree～110 degree and two intervals of 200 degree～310 degree;
(3) detect less than acetylene gas;
In two or two when above, then the discharge of the paper oil insulation in the transformer is in commitment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100581186A CN102207532A (en) | 2011-03-10 | 2011-03-10 | Oil paper insulation early stage discharge defect diagnosis method |
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| CN2011100581186A CN102207532A (en) | 2011-03-10 | 2011-03-10 | Oil paper insulation early stage discharge defect diagnosis method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103576059A (en) * | 2013-10-10 | 2014-02-12 | 国家电网公司 | Integrated fault diagnosis method and system for turn-to-turn discharging of transformer |
| CN108459246A (en) * | 2018-03-19 | 2018-08-28 | 国网天津市电力公司电力科学研究院 | A method of for judging transformer insulated deterioration critical point |
| CN113341346A (en) * | 2021-05-31 | 2021-09-03 | 国网宁夏电力有限公司电力科学研究院 | Comprehensive detection system and method for gas on oil surface of oil paper insulation power transformer |
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| CN101713810A (en) * | 2009-12-23 | 2010-05-26 | 西安交通大学 | Test unit for monitoring oil-paper insulation state |
| CN101819246A (en) * | 2010-04-27 | 2010-09-01 | 重庆大学 | Discharge capacity monitoring and collecting method, device and system for ultrahigh frequency local discharge |
| JP2010190626A (en) * | 2009-02-16 | 2010-09-02 | Univ Of Miyazaki | Device and method for diagnosis of partial discharge deterioration |
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2011
- 2011-03-10 CN CN2011100581186A patent/CN102207532A/en active Pending
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| JP2010190626A (en) * | 2009-02-16 | 2010-09-02 | Univ Of Miyazaki | Device and method for diagnosis of partial discharge deterioration |
| CN101713810A (en) * | 2009-12-23 | 2010-05-26 | 西安交通大学 | Test unit for monitoring oil-paper insulation state |
| CN101819246A (en) * | 2010-04-27 | 2010-09-01 | 重庆大学 | Discharge capacity monitoring and collecting method, device and system for ultrahigh frequency local discharge |
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| 王辉: "变压器油纸绝缘典型局部放电发展过程的研究", 《中国博士学位论文数据库 工程科技辑》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576059A (en) * | 2013-10-10 | 2014-02-12 | 国家电网公司 | Integrated fault diagnosis method and system for turn-to-turn discharging of transformer |
| CN103576059B (en) * | 2013-10-10 | 2015-12-02 | 国家电网公司 | A kind of transformer turn-to-turn electric discharge resultant fault diagnostic method and system |
| CN108459246A (en) * | 2018-03-19 | 2018-08-28 | 国网天津市电力公司电力科学研究院 | A method of for judging transformer insulated deterioration critical point |
| CN108459246B (en) * | 2018-03-19 | 2020-09-04 | 国网天津市电力公司电力科学研究院 | Method for judging insulation degradation critical point of transformer |
| CN113341346A (en) * | 2021-05-31 | 2021-09-03 | 国网宁夏电力有限公司电力科学研究院 | Comprehensive detection system and method for gas on oil surface of oil paper insulation power transformer |
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Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: NORTH CHINA ELECTRIC POWER UNIVERSITY Effective date: 20121210 Owner name: FUJIAN ELECTRIC POWER CO., LTD. NORTH CHINA ELECTR Free format text: FORMER OWNER: FUJIAN ELECTRIC POWER CO., LTD., ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20121210 |
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Effective date of registration: 20121210 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: Fujian Electric Power Co., Ltd. Applicant after: North China Electric Power University Applicant after: Fujian Electric Power Co., Ltd., Electric Power Research Institute Address before: 102206, Beijing, Changping District Desheng outside the door, Zhu Xin, North China Electric Power University Applicant before: North China Electric Power University Applicant before: Fujian Electric Power Co., Ltd., Electric Power Research Institute |
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Application publication date: 20111005 |