CN104090080A - Monitoring method for abnormal state of oil-immersed transformer - Google Patents
Monitoring method for abnormal state of oil-immersed transformer Download PDFInfo
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Abstract
The invention provides a monitoring method for an abnormal state of an oil-immersed transformer. The monitoring method comprises the following steps: (1) circularly detecting the concentration of each gas component by using a component concentration detecting module and sequentially comparing all concentration values Di with extreme values Di0 corresponding to the gas components; counting by a counter N once the detected concentrations of the gas components exceed the extreme values; and starting graded alarming once counting of the counter N is equal to or more than K, which shows that K sets of gas components exceed the extreme values; and (2) respectively detecting a total hydrocarbon content C and a total hydrocarbon absolute gas production speed V of the transformer by utilizing a hydrocarbon content detecting module and a gas production speed detecting module, respectively; and comparing a first threshold value C0 and a second threshold value C1 of the total hydrocarbon content of the transformer with the total hydrocarbon content C of the transformer, and comparing relations among the total hydrocarbon absolute gas production speed V and a first threshold value V0, a second threshold value V1 and a third threshold value V2 of the total hydrocarbon absolute gas production speed, thus judging different alarming grades.
Description
Technical field
The present invention relates to a kind of method for supervising of oil-filled transformer abnormality, belong to technology of transmission of electricity field.
Background technology
Oil-immersed power transformer is quoted widely in electric system.In normal operational process, transformer can be slowly aging under the impact of the various factorss such as mechanical stress and heat, electricity, and generate some inflammable gass.If transformer exists inner latency fault, the energy that trouble location discharges can accelerate the cracking of insulating material, impels the content of oil dissolved gas and gas production rate greatly to improve.By obtaining transformer oil sample, adopt the method for gas chromatography just can obtain the content of each component of oil dissolved gas, thereby the health status of transformer is made and being assessed or to existing abnormal transformer to carry out the analysis of failure condition.Therefore, Gases Dissolved in Transformer Oil analysis has great significance to oil-filled transformer fault diagnosis.The principle of DGA technology is that the generation speed based on any specific hydrocarbon gas changes with temperature, under specified temp, often has the factor of created gase of a certain gas to occur maximal value, along with temperature raises, the gas of factor of created gase maximum is followed successively by CH4, C2H6, C2H4, C2H2, H2, CO, CO2.This also proves between fault temperature and dissolved gas content and necessarily exists corresponding relation.These gas compositions are also known as characteristic gas or component gas.
Three-ratio method as one of DGA technology has been brought into play certain effect in engineering reality, but because ratio coding is limited, fault type is also just divided into some classical types, cannot contain all fault types in actual motion, there is ambiguity in the mapping relations between coded combination and failure mode, the complicated lotus root that simple man-to-man mapping can not objectively embody between sign and fault is comprehensively closed relation, also there is the out of true of some gas contents that may cause due to various factors simultaneously, and then fault type is formed to erroneous judgement.Therefore be necessary the DGA technology of current employing to improve to improve the precision and stability of diagnosing oil-filled transformer fault, avoid occurring erroneous judgement operation and produce harmful effect.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention proposes a kind of method for supervising of oil-filled transformer abnormality, this method for supervising can be avoided the measurement out of true that produces because of multiple factors impact or unstable to the full extent, can divide exactly rank to report to the police, alert is carried out the activities such as corresponding maintenance.
Research is found, utilizing oil dissolved gas concentration to judge in the whether abnormal process of transformer, conventionally arbitrary gas concentration over-standard the concentration of each component of gas in oil and the ultimate value of solution gas concentration in oil of recommending need to be compared, if just should attract great attention.But only rely on gas concentration value entirely accurate determining apparatus whether not have fault, because some non-failure factor also may cause Oil Dissolved Gases Concentration to increase, even surpass the gas concentration ultimate value that guide rule is recommended.
Through long-term operating experience, find, transformer fault normally starts with the low-yield fault of latency, the fault Free Development if leave, finally may cause the generation of transformer major accident, because gas concentration can only be from a current running status of side reflection transformer, and gas production rate also reflects the out of order order of severity to a certain extent, in warning progressive operation process of the present invention, in conjunction with gas concentration and gas production rate, transformer state is carried out objectively detecting assessment comprehensively just.
Based on above-mentioned research, for achieving the above object, technical conceive of the present invention is, for fear of measuring the maloperation producing, farthest guarantee judgement warning precision, the method for supervising of oil-filled transformer abnormality of the present invention has been taked elementary concentration alarm operation and warning progressive operation two-stage deterministic process, and the technological means of employing is:
1) utilize the concentration that concentration of component detection module can each gas composition of cycle detection, and each concentration value Di and the corresponding ultimate value Di0 of this gas composition are compared successively, once obtain concentration value of going beyond the limit of that this gas composition detects, carry out the counting operation of counter N, once counter, N equals or exceeds K, indicate that K group gas composition has exceeded ultimate value, starts warning progressive operation;
2) utilize hydrocarbon content detection module and gas production rate detection module to detect respectively transformer total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon, by contrast transformer total hydrocarbon content C and transformer total hydrocarbon content first threshold C0 and Second Threshold C1, and the absolute gas production rate V of contrast total hydrocarbon judges different alarm level from the relation between the absolute gas production rate first threshold of total hydrocarbon V0, Second Threshold V1 and the 3rd threshold value V2;
3) according to step 2) result, the operation judges process of alarm level is as follows,
A). when meeting C < C0 and V < V0, indication transformer is normal, and alarm level is normal condition;
B). when meeting C0 < C < C1 and V < V0, there is latency fault in indication transformer, and fault progression is slow, affects comparatively slightly, and alarm level is minor failure;
C). when meeting C0 < C < C1 and V0 < V < V1, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and definitely gas production rate V ' further judge, and need to postpone the t time before secondary detection, if still meet C0 < C ' < C1 and V0 < V ' < V1, now show to exist comparatively stable medium fault, alarm level is medium fault (stablizing),
D). when meeting C0 < C < C1 and V1 < V < V2, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and definitely gas production rate V ' further judge, and need to postpone the t time before secondary detection, if still meet C0 < C ' < C1 and V1 < V ' < V2, now show to exist the medium fault worsening comparatively rapidly, alarm level is medium fault (deterioration),
E). when meeting C1 < C and V2 < V, there is catastrophic failure in indication transformer, and fault progression worsens rapidly, affects comparatively seriously, and alarm level is catastrophic failure.
Adopt above-mentioned technological means, changed the single level judgement of the existing transformer alarm method of oil immersed type, improved the accuracy of oil-filled transformer abnormality judgement; Optimized oil-filled transformer failure warning system, reduced the probability of the erroneous judgement maloperation causing due to a variety of causes, guaranteed the accuracy of output alarm state, also the method judging by secondary detection has realized the further classification to intermediate fault alarm simultaneously, has strengthened application and the reliability of warning system.
Accompanying drawing explanation
Fig. 1 is oil-filled transformer structural representation of the present invention;
Fig. 2 is oil-filled transformer warning system sketch of the present invention;
Fig. 3 is the general flow chart of the method for supervising of oil-filled transformer abnormality of the present invention.
Embodiment
As shown in Figure 1, oil immersed type transmitting transformer structural representation of the present invention, this transformer comprises the transformer shell 1 that covers whole transformer, be connected to the insulation fuel tank 2 on transformer shell 1, transformer liner 3, and major function part winding coil 4 and the iron core 5 of transmitting transformer, pick-up unit 6 and thermo detector 7 are positioned at transformer shell 1 top edges place, for carrying out the detection of related control data, be positioned at insulating oil 10 and the air layer 11 of insulation fuel tank 2.This oil-filled transformer can be subject to the impact of the various factorss such as mechanical stress, temperature, highfield and moisture, oxygen in operational process, can under the effect of these factors, there are the various chemical reactions such as carbonization, cracking and oxidation in insulating oil, generate hydrogen, low molecular hydrocarbon compounds, greasy filth, some oxide and hydrocarbon polymer (X wax), the deteriorated and catabiosis of Here it is transformer insulation oil.Under normal circumstances, insulating oil only generates seldom some gases of amount, and the content of these gases also can remain in GB setting conventionally.Once inner latency fault occurs oil-filled transformer, the energy that trouble spot discharges can accelerate insulating oil and decompose aerogenesis, may cause gas concentration to surpass critical value.And the source of Gases Dissolved in Transformer Oil is very complicated, oil-filled transformer also can generate a small amount of gas under normal running (operation) conditions under the effect of electricity, thermal stress, when there is inner latency fault in oil-filled transformer, the energy that trouble spot discharges can accelerate the decomposition aerogenesis of insulating material, may cause the gas concentration value of overstepping the extreme limit, therefore can by the concentration of gas, roughly judge that whether oil-filled transformer state is normal.It is as shown in the table for regulation oil-filled transformer oil dissolved gas concentration limit value.
Table Gas in Oil of Transformer concentration of component ultimate value (uL/L)
As shown in Figure 2, the warning system of monitoring oil-filled transformer abnormality of the present invention comprises ECU unit, memory unit, three detection modules and warning and display unit, described three detection modules comprise concentration of component detection module, hydrocarbon content detection module, gas production rate detection module.Concentration of component detection module wherein, hydrocarbon content detection module, gas production rate detection module is connected with ECU unit, accept the steering order of ECU unit and feed back various signals to ECU unit, memory unit is connected with ECU unit, conventionally also become the ingredient of ECU, warning and display unit are responsible for the alerting signal of ECU unit output to carry out outside Graphics Processing.
Based on above-mentioned oil-filled transformer exceptional state alarm system, form, the method for supervising process of oil-filled transformer abnormality is as described below:
In elementary concentration alarm operation, described concentration of component detection module can each component of each gas of cycle detection (H2, CH4, C2H4, C2H6, C2H2, total hydrocarbon) concentration, and by each concentration value Di and the corresponding ultimate value Di0 (D10 of this gas composition, D20, D30, D40, D50, D60) compare successively, once obtain concentration value of going beyond the limit of that this gas composition detects, carry out the counting operation of counter N, once counter N equals or exceeds K (generally, N, K is integer and can arranges, K≤6, be preferably 3) time, indicate that K group gas composition has exceeded ultimate value, start warning progressive operation, if counter does not reach K value after having measured six groups of concentration, counter can send in standby mode or zero clearing wait detection next time instruction.Thus, by repeated detection, judge, guaranteed the accuracy of output alarm state, avoided because a certain gas composition detects the false alarm that error causes.
Described hydrocarbon content detection module and gas production rate detection module detect respectively transformer total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon, C0, C1 represents respectively transformer total hydrocarbon content first threshold and Second Threshold, V0, V1, V2 represents respectively the absolute gas production rate first threshold of total hydrocarbon, Second Threshold and the 3rd threshold value, by contrast transformer total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon, judge different alarm level from the numerical relation between above-mentioned threshold value, these alarm level are divided into minor failure, medium fault and catastrophic failure, in research process, find simultaneously, for refinement fault level, the intermediate fault that middle rank fault can be divided into again stable intermediate fault and continue to worsen, the warning of middle rank fault also occurs that than being easier to the erroneous judgement detecting is broken and the reduction of accuracy, therefore, the method that warning system of the present invention judges by secondary detection has realized the raising to intermediate fault alarm accuracy.
Particularly, demonstrate as shown in Figure 3 the performing step general flow chart of warning system of the present invention,
First start warning system, i value is set in system, K value and counter N zero clearing, i=1 wherein, i, K is integer, K≤6, be preferably 3, in concentration of component detection module, detect each gas composition (H2, CH4, C2H4, C2H6, C2H2, total hydrocarbon) concentration obtains each concentration value Di (D1, D2, D3, D4, D5, D6), whether the concentration value that judges successively each gas composition has exceeded ultimate value Di0 (D10 separately, D20, D30, D40, D50, D60), once corresponding gas composition value of going beyond the limit of, carry out 1 operation that adds of counter N, when counter N is more than or equal to K, when the gas composition quantity of the value of going beyond the limit of surpasses K, the elementary concentration alarm operation that shows warning system completes, start and enter warning progressive operation.It should be noted that, above-mentioned detected components type can be selected according to situation, can be three kinds, four kinds or five kinds etc.
At described hydrocarbon content detection module and gas production rate detection module, detect respectively transformer total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon, by total hydrocarbon content C and absolute gas production rate V and total hydrocarbon content first threshold and Second Threshold C0, C1, the absolute gas production rate first threshold of total hydrocarbon, Second Threshold and the 3rd threshold value V0, V1, V2 compares, and judges respectively total hydrocarbon content C and the absolute residing interval range of gas production rate V, and judgement draws corresponding fault level warning.
Wherein it should be noted that, C0, C1, V0, V1, the concrete selection of V2 can be obtained by empirical value, also C0 and V0 can be chosen as to empirical value, C1=2～3C0, V1=1～2V0 or V2=3～4V0.
Based on above-mentioned comparing result, the deterministic process of the progressive operation of specifically reporting to the police is as follows,
1). when meeting C < C0 and V < V0, indication transformer is normal, and alarm level is normal condition;
2). when meeting C0 < C < C1 and V < V0, there is latency fault in indication transformer, and fault progression is slow, affects comparatively slightly, and alarm level is minor failure;
3). when meeting C0 < C < C1 and V0 < V < V1, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and definitely gas production rate V ' further judge, and need to postpone the t time before secondary detection, if still meet C0 < C ' < C1 and V0 < V ' < V1, now show to exist comparatively stable medium fault, alarm level is medium fault (stablizing),
4). when meeting C0 < C < C1 and V1 < V < V2, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and definitely gas production rate V ' further judge, and need to postpone the t time before secondary detection, if still meet C0 < C ' < C1 and V1 < V ' < V2, now show to exist the medium fault worsening comparatively rapidly, alarm level is medium fault (deterioration),
5). when meeting C1 < C and V2 < V, there is catastrophic failure in indication transformer, and fault progression worsens rapidly, affects comparatively seriously, and alarm level is catastrophic failure.
As mentioned above, warning system of the present invention is detected and is realized pre-alarm and in conjunction with the warning progressive operation of gas concentration and gas production rate by elementary concentration, optimized transformer fault warning system, reduced the probability of the erroneous judgement maloperation causing due to a variety of causes, guaranteed the accuracy of output alarm state, also the method judging by secondary detection has realized the further classification to intermediate fault alarm simultaneously, has strengthened application and the reliability of warning system.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, simultaneously, the cited formula of the present invention, symbol (order mark i for example, threshold k, counter N etc.) etc. implication is the habitual implication in this area, and scope of the present invention is by claims and be equal to and limit.The convenience that the accompanying drawing simultaneously providing in instructions is only understood as instructions, does not carry out any restriction to claim, and process flow diagram is only also that the simplification of making as the convenience of understanding is processed, and does not cause and discloses inadequate defect etc.
Claims (3)
1. a method for supervising for oil-filled transformer abnormality, comprises the following steps:
1) utilize the concentration that concentration of component detection module can each gas composition of cycle detection, and each concentration value Di and the corresponding ultimate value Di0 of this gas composition are compared successively, once obtain concentration value of going beyond the limit of that this gas composition detects, carry out the counting operation of counter N, once counter, N equals or exceeds K, indicate that K group gas composition has exceeded ultimate value, starts warning progressive operation;
2) utilize hydrocarbon content detection module and gas production rate detection module to detect respectively transformer total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon, by contrast transformer total hydrocarbon content C and transformer total hydrocarbon content first threshold C0 and Second Threshold C1, and the absolute gas production rate V of contrast total hydrocarbon judges different alarm level from the relation between the absolute gas production rate first threshold of total hydrocarbon V0, Second Threshold V1 and the 3rd threshold value V2;
3) according to step 2) result, the operation judges process of alarm level is as follows,
A). when meeting C < C0 and V < V0, indication transformer is normal, and alarm level is normal condition;
B). when meeting C0 < C < C1 and V < V0, there is latency fault in indication transformer, and fault progression is slow, affects comparatively slightly, and alarm level is minor failure;
C). when meeting C0 < C < C1 and V0 < V < V1, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and definitely gas production rate V ' further judge, and need to postpone the t time before secondary detection, if still meet C0 < C ' < C1 and V0 < V ' < V1, now show to exist comparatively stable medium fault, alarm level is medium fault (stablizing),
D). when meeting C0 < C < C1 and V1 < V < V2, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and definitely gas production rate V ' further judge, and need to postpone the t time before secondary detection, if still meet C0 < C ' < C1 and V1 < V ' < V2, now show to exist the medium fault worsening comparatively rapidly, alarm level is medium fault (deterioration),
E). when meeting C1 < C and V2 < V, there is catastrophic failure in indication transformer, and fault progression worsens rapidly, affects comparatively seriously, and alarm level is catastrophic failure.
2. according to the method for supervising of the oil-filled transformer abnormality of claim 1, it is characterized in that, gas composition comprises H2, CH4, C2H4, C2H6, C2H2, total hydrocarbon.
3. according to the method for supervising of the oil-filled transformer abnormality of claim 1, it is characterized in that, generally, K can be set to K≤6, is preferably 3.
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Cited By (11)
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| CN104330684A (en) * | 2014-10-31 | 2015-02-04 | 国家电网公司 | Multi-parameter power transformer core inside local short-circuit fault monitoring method |
| CN106154119A (en) * | 2015-03-24 | 2016-11-23 | 国家电网公司 | A kind of extra-high voltage direct-current transmission engineering converter power transformer aerogenesis verification method |
| CN108414684A (en) * | 2018-01-31 | 2018-08-17 | 贵州乌江水电开发有限责任公司东风发电厂 | A kind of for transformer status assessment and method for diagnosing faults |
| CN109186786A (en) * | 2018-10-10 | 2019-01-11 | 西安交通大学 | Whether a kind of monitoring electrical equipment is in electrical contact the devices and methods therefor of overheat |
| CN111289728A (en) * | 2020-03-26 | 2020-06-16 | 云南电网有限责任公司电力科学研究院 | Device and method for monitoring dissolved gas in insulating oil |
| CN111856167A (en) * | 2019-04-19 | 2020-10-30 | 宁波奥克斯高科技有限公司 | Detection method of box-type transformer and transformer |
| CN111856166A (en) * | 2019-04-19 | 2020-10-30 | 宁波奥克斯高科技有限公司 | Detection method of box-type transformer and transformer |
| CN113280884A (en) * | 2020-02-20 | 2021-08-20 | 阳江核电有限公司 | Gas quantity monitoring system, method and storage medium for gas relay of oil-immersed transformer |
| CN114360176A (en) * | 2021-12-15 | 2022-04-15 | 中煤科工开采研究院有限公司 | Fully mechanized coal mining face safety monitoring method |
| CN114994230A (en) * | 2022-07-18 | 2022-09-02 | 广东电网有限责任公司佛山供电局 | Method and device for determining main transformer oil chromatography abnormality and storage medium |
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| CN104330684A (en) * | 2014-10-31 | 2015-02-04 | 国家电网公司 | Multi-parameter power transformer core inside local short-circuit fault monitoring method |
| CN106154119A (en) * | 2015-03-24 | 2016-11-23 | 国家电网公司 | A kind of extra-high voltage direct-current transmission engineering converter power transformer aerogenesis verification method |
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| CN109186786A (en) * | 2018-10-10 | 2019-01-11 | 西安交通大学 | Whether a kind of monitoring electrical equipment is in electrical contact the devices and methods therefor of overheat |
| CN111856167A (en) * | 2019-04-19 | 2020-10-30 | 宁波奥克斯高科技有限公司 | Detection method of box-type transformer and transformer |
| CN111856166A (en) * | 2019-04-19 | 2020-10-30 | 宁波奥克斯高科技有限公司 | Detection method of box-type transformer and transformer |
| CN111856167B (en) * | 2019-04-19 | 2023-06-27 | 宁波奥克斯智能科技股份有限公司 | Detection method of box-type transformer and transformer |
| CN113280884A (en) * | 2020-02-20 | 2021-08-20 | 阳江核电有限公司 | Gas quantity monitoring system, method and storage medium for gas relay of oil-immersed transformer |
| CN111289728A (en) * | 2020-03-26 | 2020-06-16 | 云南电网有限责任公司电力科学研究院 | Device and method for monitoring dissolved gas in insulating oil |
| CN114360176A (en) * | 2021-12-15 | 2022-04-15 | 中煤科工开采研究院有限公司 | Fully mechanized coal mining face safety monitoring method |
| CN114994230A (en) * | 2022-07-18 | 2022-09-02 | 广东电网有限责任公司佛山供电局 | Method and device for determining main transformer oil chromatography abnormality and storage medium |
| CN116643181A (en) * | 2022-08-25 | 2023-08-25 | 浙江长兴震革科技有限公司 | Storage battery state monitoring system |
| CN116643181B (en) * | 2022-08-25 | 2024-04-16 | 浙江长兴震革科技有限公司 | Storage battery state monitoring system |
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Inventor after: Chen Ning Inventor after: Wang Chuanyong Inventor after: Han Peng Inventor after: Zhang Jian Inventor after: Wang Kun Inventor after: Yang Fengwen Inventor after: Kang Wenwen Inventor after: Dai Ergang Inventor after: Sun Baofeng Inventor before: Hu Xiaoqing |
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Effective date of registration: 20151120 Address after: 277800 Zaozhuang New District, Shandong, the Yellow River Road, No. 999 Applicant after: Zaozhuang Power Supply Company of State Grid Shandong Electric Power Company Applicant after: State Grid Corporation of China Address before: Le Cheng Zhen Niu Bi Dong Cun 325600 Yueqing City, Zhejiang Province Applicant before: Hu Xiaoqing |
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