CN104090080B - A kind of method for supervising of oil-filled transformer abnormality - Google Patents
A kind of method for supervising of oil-filled transformer abnormality Download PDFInfo
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Abstract
A kind of method for supervising of oil-filled transformer abnormality, comprise the following steps: 1) utilize concentration of component detection module can the concentration of each gas composition of cycle detection, and each concentration value Di is compared successively with the ultimate value Di0 corresponding to this gas composition, once the concentration obtaining the detection of this gas composition goes beyond the limit of value, then carry out the counting operation of counter N, K is equaled or exceeded once counter N, then indicate that K group gas composition is beyond ultimate value, then carry out startup warning progressive operation; 2) hydrocarbon content detection module and gas production rate detection module is utilized to detect transformer total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon respectively, by contrast transformer total hydrocarbon content C and transformer total hydrocarbon content first threshold C0 and Second Threshold C1, and contrast total hydrocarbon absolute gas production rate V and total hydrocarbon absolute gas production rate first threshold V0, relation between Second Threshold V1 and the 3rd threshold value V2 judges different alarm level.
Description
Technical field
The present invention relates to a kind of method for supervising of oil-filled transformer abnormality, belong to technical field of electric power transmission.
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 mechanical stress and the various factors such as heat, electricity, and generate some inflammable gass.If transformer exists inner Hidden 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, thus assessment is made to the health status of transformer or the transformer that there is exception is carried out to 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 changes with temperature based on the generation speed of the specific hydrocarbon gas of any one, at a certain temperature, often has the factor of created gase of a certain gas to occur maximal value, along with temperature raises, the maximum gas of factor of created gase is followed successively by CH4, C2H6, C2H4, C2H2, H2, CO, CO2.This also proves necessarily to there is corresponding relation between Faulty Temperature with dissolved gas content.These gas compositions are also referred to as characteristic gas or component gas.
Three-ratio method as one of DGA technology has played certain effect in engineering reality, but because ratio coding is limited, fault type is also just divided into some classical types, the all fault types in actual motion cannot be contained, 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 comprehensively closes relation, also there is the out of true of the gas content that some may cause due to various factors simultaneously, and then erroneous judgement is formed to fault type.Therefore be necessary the precision and stability improving to improve diagnosis oil-filled transformer fault to the DGA technology adopted at present, avoid that erroneous judgement operation occurs 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 avoid the measurement out of true that produces or instability because multiple factors impact to the full extent, can rank be divided exactly to report to the police, alert carries out the activities such as corresponding maintenance.
Research finds, utilizing oil dissolved gas concentration to judge in the process whether transformer is abnormal, usually need by the concentration of each for oil dissolved gas component with recommend the ultimate value of solution gas concentration in oil to compare, if arbitrary gas concentration over-standard just should attract great attention.But only rely on gas concentration value entirely accurate determining apparatus whether can not there is fault, because some non-faulting factor also may cause Oil Dissolved Gases Concentration to increase, even exceed the gas concentration ultimate value that directive/guide is recommended.
Find through long-term operating experience, 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 reflect from a side running status that transformer is current, 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, objectively check and evaluation is carried out comprehensively to transformer state just.
Based on above-mentioned research, for achieving the above object, technical conceive of the present invention is, in order to avoid measuring the maloperation produced, farthest ensure to judge alarm accuracy, the method for supervising of oil-filled transformer abnormality of the present invention takes elementary concentration alarm operation and warning progressive operation two-stage deterministic process, and the technological means of employing is:
1) utilize concentration of component detection module can the concentration of each gas composition of cycle detection, and each concentration value Di is compared successively with the ultimate value Di0 corresponding to this gas composition, once the concentration obtaining the detection of this gas composition goes beyond the limit of value, then carry out the counting operation of counter N, K is equaled or exceeded once counter N, then indicate that K group gas composition is beyond ultimate value, then carry out startup warning progressive operation;
2) hydrocarbon content detection module and gas production rate detection module is utilized to detect transformer total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon respectively, by contrast transformer total hydrocarbon content C and transformer total hydrocarbon content first threshold C0 and Second Threshold C1, and contrast total hydrocarbon absolute gas production rate V and total hydrocarbon absolute gas production rate first threshold V0, relation between Second Threshold V1 and the 3rd threshold value V2 judges different alarm level;
3) according to step 2) result, the operation judges process of alarm level is as follows,
A). when meet C < C0 and V < V0 time, indication transformer is normal, then alarm level is normal condition;
B). when meet C0 < C < C1 and V < V0 time, there is Hidden fault in indication transformer, and fault progression is slow, and impact is comparatively slight, then alarm level is minor failure;
C). when meet C0 < C < C1 and V0 < V < V1 time, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' judges further, and need before secondary detection to postpone the t time, if still meet C0 < C ' < C1 and V0 < V ' < V1, now show to there is comparatively stable medium outage, then alarm level is medium outage (stablizing),
D). when meet C0 < C < C1 and V1 < V < V2 time, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' judges further, and need before secondary detection to postpone the t time, if still meet C0 < C ' < C1 and V1 < V ' < V2, now show to exist the medium outage worsened comparatively rapidly, then alarm level is medium outage (deterioration),
E). when meet C1 < C and V2 < V time, there is catastrophic failure in indication transformer, and fault progression worsens rapidly, and impact is comparatively serious, then alarm level is catastrophic failure.
Have employed above-mentioned technological means, the single level changing the existing transformer alarm method of oil immersed type judges, improves the accuracy that oil-filled transformer abnormality judges; Optimize oil-filled transformer failure warning system, decrease the probability of the erroneous judgement maloperation caused due to a variety of causes, ensure that the accuracy of output alarm state, the method simultaneously also judged by secondary detection achieves the further classification to intermediate fault alarm, enhances 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 covering whole transformer, be connected to the insulation fuel tank 2 on transformer shell 1, transformer liner 3, and the major function part winding coil 4 of transmitting transformer and iron core 5, 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 mechanical stress, temperature, highfield and the various factors such as moisture, oxygen in operational process, the various chemical reactions such as carbonization, cracking and oxidation can be there is in insulating oil under the effect of these factors, generate hydrogen, low molecular hydrocarbon compounds, greasy filth, some oxide and hydrocarbon polymer (X wax), Here it is transformer insulation oil deterioration and catabiosis.Under normal circumstances, insulating oil only generates some gases of seldom amount, and the content of these gases also can remain within national regulations value usually.Once inner Hidden fault occurs oil-filled transformer, the energy of trouble spot release can accelerate insulating oil and decompose aerogenesis, and gas concentration may be caused to exceed 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 operating conditions under the effect of electricity, thermal stress, when there is inner Hidden fault in oil-filled transformer, the energy of trouble spot release can accelerate the decomposition aerogenesis of insulating material, gas concentration over-limit condition may be caused, therefore can roughly judge that whether oil-filled transformer state is normal by the concentration of gas.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.Wherein concentration of component detection module, 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 signal to ECU unit, memory unit is connected with ECU unit, usually also become the ingredient of ECU, the alerting signal that warning and display unit are responsible for ECU unit exports carries out outside Graphics Processing.
Based on above-mentioned oil-filled transformer exceptional state alarm system composition, 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 (H2 of each gas of cycle detection, CH4, C2H4, C2H6, C2H2, total hydrocarbon) concentration, and by the ultimate value Di0 (D10 corresponding to each concentration value Di and this gas composition, D20, D30, D40, D50, D60) compare successively, once the concentration obtaining the detection of this gas composition goes beyond the limit of value, then carry out the counting operation of counter N, once counter N equals or exceeds K (under normal circumstances, N, K is integer and can arranges, K≤6, be preferably 3) time, then indicate that K group gas composition is beyond ultimate value, then carry out startup warning progressive operation, if counter does not reach K value after having measured six groups of concentration, then counter can be in standby mode or reset and wait for that next detection instruction sends.Thus, judged by repeated detection, ensure that the accuracy of output alarm state, avoid the false alarm caused because a certain gas composition detects error.
Described hydrocarbon content detection module and gas production rate detection module detect transformer total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon respectively, C0, C1 represents transformer total hydrocarbon content first threshold and Second Threshold respectively, V0, V1, V2 represents the absolute gas production rate first threshold of total hydrocarbon respectively, Second Threshold and the 3rd threshold value, different alarm level is judged from the numerical relation between above-mentioned threshold value by contrast transformer total hydrocarbon content C and total hydrocarbon absolute gas production rate V, these alarm level are divided into minor failure, medium outage and catastrophic failure, find in research process simultaneously, in order to refinement fault level, middle rank fault can be divided into again stable intermediate fault and continuous worsening intermediate fault, the warning of middle rank fault is also than being easier to the reduction occurring erroneous judgement and the accuracy detected, therefore, warning system of the present invention achieves the raising to intermediate fault alarm accuracy by the method that secondary detection judges.
Specifically, demonstrate the performing step general flow chart of warning system of the present invention as shown in Figure 3,
First warning system is started, i value is set in systems in which, K value and counter N reset, wherein i=1, i, K is integer, K≤6, be preferably 3, each gas composition (H2 is detected in concentration of component detection module, CH4, C2H4, C2H6, C2H2, total hydrocarbon) concentration obtain each concentration value Di (D1, D2, D3, D4, D5, D6), judge that whether the concentration value of each gas composition is beyond respective ultimate value Di0 (D10 successively, D20, D30, D40, D50, D60), once the gas composition of correspondence goes beyond the limit of value, that then carries out counter N adds 1 operation, when counter N is more than or equal to K, namely when the gas composition quantity going beyond the limit of value is more than K, show that the elementary concentration alarm operation of warning system completes, then 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.
Transformer total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon is detected respectively at described hydrocarbon content detection module and gas production rate detection module, 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 total hydrocarbon content C and the interval range residing for absolute gas production rate V respectively, judges to show that corresponding fault level is reported to the police.
Wherein it should be noted that, the concrete selection of C0, C1, V0, V1, V2 can be obtained by empirical value, also C0 and V0 can be chosen as empirical value, C1=2 ~ 3C0, V1=1 ~ 2V0 or V2=3 ~ 4V0.
Based on above-mentioned comparing result, the deterministic process of concrete warning progressive operation is as follows,
1). when meet C < C0 and V < V0 time, indication transformer is normal, then alarm level is normal condition;
2). when meet C0 < C < C1 and V < V0 time, there is Hidden fault in indication transformer, and fault progression is slow, and impact is comparatively slight, then alarm level is minor failure;
3). when meet C0 < C < C1 and V0 < V < V1 time, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' judges further, and need before secondary detection to postpone the t time, if still meet C0 < C ' < C1 and V0 < V ' < V1, now show to there is comparatively stable medium outage, then alarm level is medium outage (stablizing),
4). when meet C0 < C < C1 and V1 < V < V2 time, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' judges further, and need before secondary detection to postpone the t time, if still meet C0 < C ' < C1 and V1 < V ' < V2, now show to exist the medium outage worsened comparatively rapidly, then alarm level is medium outage (deterioration),
5). when meet C1 < C and V2 < V time, there is catastrophic failure in indication transformer, and fault progression worsens rapidly, and impact is comparatively serious, then alarm level is catastrophic failure.
As mentioned above, warning system of the present invention realizes pre-alarm and the warning progressive operation in conjunction with gas concentration and gas production rate by elementary Concentration Testing, optimize transformer fault warning system, decrease the probability of the erroneous judgement maloperation caused due to a variety of causes, ensure that the accuracy of output alarm state, the method simultaneously also judged by secondary detection achieves the further classification to intermediate fault alarm, enhances application and the reliability of warning system.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, simultaneously, formula cited by the present invention, symbol (such as sequence mark i, threshold k, counter N etc.) etc. implication be accustomed meanings in this area, scope of the present invention is by claims and equivalency thereof.The accompanying drawing simultaneously provided in instructions, only as the convenience that instructions is understood, does not carry out any restriction to claim, and process flow diagram is also only the simplify processes of making as the convenience understood, and does not cause the defect etc. of insufficient disclosure.
Claims (3)
1. the method for supervising of an oil-filled transformer abnormality, this oil-filled transformer comprises the transformer shell covering whole transformer, be connected to the insulation fuel tank on transformer shell, transformer liner, and winding coil and iron core, pick-up unit and thermo detector are positioned at transformer shell top edges place; This method for supervising comprises the following steps:
1) utilize concentration of component detection module can the concentration of each gas composition of cycle detection, and each concentration value Di is compared successively with the ultimate value Di0 corresponding to this gas composition, once the concentration obtaining the detection of this gas composition goes beyond the limit of value, then carry out the counting operation of counter N, equal or exceed K once counter N, then carry out startup warning progressive operation;
2) hydrocarbon content detection module and gas production rate detection module is utilized to detect transformer total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon respectively, by contrast transformer total hydrocarbon content C and transformer total hydrocarbon content first threshold C0 and Second Threshold C1, and contrast total hydrocarbon absolute gas production rate V and total hydrocarbon absolute gas production rate first threshold V0, relation between Second Threshold V1 and the 3rd threshold value V2 judges different alarm level;
3) according to step 2) result, the operation judges process of alarm level is as follows,
A). when meet C < C0 and V < V0 time, indication transformer is normal, then alarm level is normal condition;
B). when meet C0 < C < C1 and V < V0 time, there is Hidden fault in indication transformer, and fault progression is slow, and impact is comparatively slight, then alarm level is minor failure;
C). when meet C0 < C < C1 and V0 < V < V1 time, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' judges further, and need before secondary detection to postpone the t time, if still meet C0 < C ' < C1 and V0 < V ' < V1, now show to there is comparatively stable medium outage, then alarm level is represent stable medium outage,
D). when meet C0 < C < C1 and V1 < V < V2 time, likely there is obvious fault in indication transformer, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' judges further, and need before secondary detection to postpone the t time, if still meet C0 < C ' < C1 and V1 < V ' < V2, now show to exist the medium outage worsened comparatively rapidly, then alarm level is represent the medium outage worsened,
E). when meet C1 < C and V2 < V time, there is catastrophic failure in indication transformer, and fault progression worsens rapidly, and impact is comparatively serious, then alarm level is catastrophic failure.
2. the method for supervising of oil-filled transformer abnormality according to claim 1, it is characterized in that, gas composition comprises H
2, CH
4, C
2h
4, C
2h
6, C
2h
2, total hydrocarbon.
3. the method for supervising of oil-filled transformer abnormality according to claim 1, it is characterized in that, K is set to K≤6.
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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 |
| CN106154119B (en) * | 2015-03-24 | 2019-03-19 | 国家电网公司 | A kind of extra-high voltage direct-current transmission engineering converter power transformer production gas 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 |
| CN109186786B (en) * | 2018-10-10 | 2020-01-07 | 西安交通大学 | Device and method for monitoring whether electrical contact of electrical equipment is overheated |
| CN111856166B (en) * | 2019-04-19 | 2023-08-01 | 宁波奥克斯智能科技股份有限公司 | 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 |
| CN114994230B (en) * | 2022-07-18 | 2023-04-07 | 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 |
| 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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| US6037592A (en) * | 1997-02-14 | 2000-03-14 | Underground Systems, Inc. | System for measuring gases dissolved in a liquid |
| US6289716B1 (en) * | 1998-08-19 | 2001-09-18 | Electric Power Research Institute, Inc. | Method for on-line assessment and indication of transformer conditions |
| CN102680814B (en) * | 2012-03-29 | 2015-11-25 | 河北省电力公司电力科学研究院 | A kind of diagnostic method of severity degree of transformer fault |
| CN103630768A (en) * | 2012-08-23 | 2014-03-12 | 天津市电力公司 | Method for diagnosing transformer fault in transformer station |
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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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