CN105527554A - Power transmission transformer control system capable of gradable early warning - Google Patents
Power transmission transformer control system capable of gradable early warning Download PDFInfo
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- CN105527554A CN105527554A CN201610069329.2A CN201610069329A CN105527554A CN 105527554 A CN105527554 A CN 105527554A CN 201610069329 A CN201610069329 A CN 201610069329A CN 105527554 A CN105527554 A CN 105527554A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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Abstract
A power transmission transformer control system capable of gradable early warning includes a power transmission transformer ECU unit, a storage unit, three detection modules, a three-ratio method coding judgment module, and an early warning and display unit. A component concentration detection module can circularly detect each component concentration of the gases, and compares each concentration value Di with a limiting value Di0 corresponding to the gas component in order. A hydrocarbon content detection module and a gas production rate detection module judge different grades of early warning results through comparison with a numerical relation of a total hydrocarbon content C and a total hydrocarbon absolute gas production rate V of a transformer with the above threshold. The power transmission transformer ECU unit artificially or automatically judges whether three-ratio method coding judgment is needed based on the early warning results. When a three-ratio method operation is needed to judge the fault type, the three-ratio method coding judgment module is started, and a required characteristic gas component value is extracted to judge the corresponding fault type.
Description
Technical field
The present invention relates to a kind of transmitting transformer control system improving three-ratio method, belong to technical field of electric power transmission.
Background technology
Along with the increase of power equipment capacity and the expansion of electrical network scale, have higher requirement to the safe operation of electric system and power supply reliability, the various countries' large-scale blackout in recent years occurred is also for alarm bell has been beaten in China's electric system.With a very important position in electric system of transformer, be one of electrical equipment most important and the most expensive in electric system, its safe reliability run is directly connected to the safety and stablization of electric system.Therefore, improve transformer particularly the safe and reliable operation tool of large-scale power transformer reliability of operation to whole electrical network be of great significance.Gases Dissolved in Transformer Oil analyzes the effective means that (DGA) technology is considered to Diagnosis for Power Transformer initial failure always.It can Timeliness coverage inside transformer exist insulation fault, be conducive to promote by the transition of periodic maintenance mode to State Maintenance mode, thus receive and apply widely.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, C0, CO2.
Because transformer oil has excellent heat radiation and insulating property, therefore 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.
And three-ratio method is a kind of method that relative ratio according to gas concentration carries out transformer fault diagnosis.The substantial connection that the relative ratio of the gas componant content that it generates under the effect of fault energy according to TRANSFORMER INSULATING MATERIAL and trouble spot temperature exist, chooses gas diffusivity and does ratio at two kinds of gases that dissolved in insulating oil degree is similar from five kinds of characteristic gas components.Three groups of ratios are chosen altogether according to above-mentioned method, be respectively acetylene (C2H2)/ethene (C2H4), methane (CH4)/hydrogen (H2), ethene (C2H4)/ethane (C2H6), and according to the coding rule (not shown) that directive/guide is recommended, three kinds of ratios are encoded.Such as: time acetylene (C2H2)/ethene (C2H4) is less than 0.1, coding settings is 0; Time acetylene (C2H2)/ethene (C2H4) is greater than or equal to 0.1 and is less than 3, coding settings is 1; Time acetylene (C2H2)/ethene (C2H4) is greater than or equal to 3, coding settings is 2.After the coding of acquisition three kinds of ratios, just can judge fault type and possible failure cause easily according to the fault type determination methods listed by directive/guide defined table.Because this method is simple and practical in engineering, therefore, the transmitting transformer control system of three-ratio method is adopted to have great significance to oil-filled transformer fault diagnosis.
Certainly, also there is obvious weak point in three-ratio method, such as when each component concentration of gas and gas production rate all do not exceed standard, running state of transformer is normal, three-ratio method diagnosis is invalid, only have when gas content exceeds standard or gas production rate exceeds standard or have enough foundations to judge that transformer exists fault time, three-ratio method diagnosis just can be meaningful.Owing to there is error when carrying out sampling analysis test to oil dissolved gas, bringing certain influence so also can to the relative ratio of gas, the inaccurate of diagnostic result may be caused.Therefore, when carrying out Chromatographic Analysis of Transformer oil test, test error must meet the requirement of directive/guide defined, should avoid the various factor interference that may reduce precision as far as possible.
Therefore, be necessary that the transmitting transformer control system to the employing three-ratio method adopted at present improves to improve the precision and stability of Transformer Fault Diagnosis, 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 transmitting transformer control system improving three-ratio method, this transmitting transformer control system can avoid the measurement out of true that produces or instability because multiple factors impact to the full extent, early warning in advance can be carried out before carrying out three-ratio method monitoring, this early warning operating process can also divide rank early warning exactly, can send pre-alert notification before three-ratio method monitors the type that is out of order accurately.
For achieving the above object, technical conceive of the present invention is, in order to avoid measuring the maloperation produced, farthest ensure the fault type accuracy of judgement degree of three-ratio method, except three-ratio method coding judgement system, introduce early warning system, the early warning system of transmitting transformer control system of the present invention takes elementary concentration early warning operation and early warning progressive operation two-stage deterministic process, and the technological means of employing is:
Scheme 1, a kind of transmitting transformer control system improving three-ratio method, it comprises transmitting transformer ECU unit, memory unit, three detection modules, three-ratio method coding judge module and early 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, three-ratio method coding judge module is connected with ECU unit, accept the steering order of ECU unit and feed back various signal to ECU unit, memory unit judge module of encoding with ECU unit and three-ratio method is respectively connected, and the early warning signal that early warning and display unit are responsible for ECU unit exports carries out outside Graphics Processing;
Wherein said concentration of component detection module can the concentration of each component of each gas 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 early warning progressive operation;
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 represent transformer total hydrocarbon content first threshold and Second Threshold respectively, V0, V1 represent the absolute gas production rate first threshold of total hydrocarbon and Second Threshold respectively, are judged the early warning result of different brackets by contrast transformer total hydrocarbon content C and the numerical relation between total hydrocarbon absolute gas production rate V and above-mentioned threshold value;
Described transmitting transformer ECU unit carries out artificially based on above-mentioned early warning result or automatically determines whether that needing to carry out three-ratio method coding judges, when needs carry out the concrete failure judgement type of three-ratio method computing, start three-ratio method coding judge module, the characteristic gas component numerical value needed for extraction carries out corresponding fault type judgement.
Scheme 2, transmitting transformer control system according to the improvement three-ratio method of scheme 1, it is characterized in that, each component of each gas comprises H2, CH4, C2H4, C2H6, C2H2, total hydrocarbon.
Scheme 3, transmitting transformer control system according to the improvement three-ratio method of scheme 1, it is characterized in that, under normal circumstances, K can be set to K≤6, is preferably 3.
Scheme 4, transmitting transformer control system according to the improvement three-ratio method of scheme 1, it is characterized in that, described early warning result is divided into normal condition, minor failure, medium outage and catastrophic failure, wherein C0 and V0 is chosen as empirical value, C1=2 ~ 3C0, V1=2 ~ 3V0.。
Invent after deliberation, have employed above-mentioned technological means, change the single level judgment model of existing transmitting transformer control system, improve and utilize three-ratio method to judge the accuracy of transformer fault type; Optimize the early warning fail operation pattern of transformer control system, decrease the probability of the erroneous judgement maloperation caused due to a variety of causes, ensure that the accuracy exporting alert status, the method simultaneously also judged by secondary detection is achieved and detects the further checking of fault pre-alarming at different levels, enhances application and the reliability of early warning system.
Accompanying drawing explanation
Fig. 1 is the transmitting transformer control system sketch that the present invention improves three-ratio method;
Fig. 2 is the workflow sketch that the present invention improves the transmitting transformer control system of three-ratio method;
Fig. 3 is transmitting transformer structural representation of the present invention.
Embodiment
As shown in Figure 1, the transmitting transformer control system of improvement three-ratio method of the present invention comprises transmitting transformer ECU unit, memory unit, three detection modules, three-ratio method coding judge module and early 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, three-ratio method coding judge module is connected with ECU unit, accept the steering order of ECU unit and feed back various signal to ECU unit, memory unit judge module of encoding with ECU unit and three-ratio method is respectively connected, and the early warning signal that early warning and display unit are responsible for ECU unit exports carries out outside Graphics Processing.
Described concentration of component detection module, hydrocarbon content detection module, gas production rate detection module is responsible for before startup three-ratio method coding judge module start detection, detect, judge and defeated out of order early warning result, this early warning result can be divided into normal condition, minor failure, medium outage and catastrophic failure, generally, normal condition and minor failure do not need to carry out urgent process, only need continuous observation, and just judge concrete fault type further when there is medium outage and catastrophic failure.That is, three-ratio method coding judge module does not generally carry out work, only after aforesaid early warning result occurs, just based on early warning result by artificially or automatically carry out triggerings startup, such setting enormously simplify the application of three-ratio method, enriching the function of transmitting transformer control system simultaneously, just having diagnosed when needing the diagnosis carrying out fault type, when not needing, only played general fault pre-alarming.Simultaneously in order to improve the reliability of fault pre-alarming, the method judged by secondary detection is achieved and detects the further checking of fault pre-alarming at different levels, enhances application and the reliability of early warning system.Below the transmitting transformer control system improving three-ratio method is described in detail:
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 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, 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 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 transformer state is normal by the concentration of gas.It is as shown in the table for regulation gas dissolved in oil of power trans-formers ultimate value.
Table Gas in Oil of Transformer concentration of component ultimate value (uL/L)
Aforesaid prealarming process can be divided into elementary concentration early warning operation and early warning progressive operation two parts:
In elementary concentration early warning 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 early 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 polycomponent repeated detection, ensure that the accuracy exporting early warning result, avoid the mistake early warning caused because a certain gas composition detects error.
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 early 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.
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 represents the absolute gas production rate first threshold of total hydrocarbon and Second Threshold respectively, different advanced warning grades 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 advanced warning grades are divided into normal condition, minor failure, medium outage and catastrophic failure, find in research process simultaneously, the early warning of fault at different levels is also than being easier to the reduction occurring erroneous judgement and the accuracy detected, therefore, early warning system of the present invention achieves the raising to fault pre-alarming accuracy at different levels by the method that secondary detection judges.
Specifically, demonstrate the transmitting transformer control system workflow sketch of improvement three-ratio method of the present invention as shown in Figure 2,
First early warning operation steps is started, i value is set, K value and counter N reset, wherein i=1, i, K is integer, K≤6, be preferably 3, each component (the H2 of each gas 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 early warning operation of early warning system completes, then start and enter early warning progressive operation,
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, by total hydrocarbon content C and absolute gas production rate V respectively with total hydrocarbon content first threshold C0 and Second Threshold C1, total hydrocarbon absolute gas production rate first threshold V0 and Second Threshold V1 compares, judge the above-mentioned threshold interval scope residing for total hydrocarbon content C and absolute gas production rate V respectively, judge to draw corresponding fault level early warning.
Wherein it should be noted that, the concrete selection of C0, C1, V0, V1 can be obtained by empirical value, also C0 and V0 can be chosen as empirical value, C1=2 ~ 3C0, V1=2 ~ 3V0.Above-mentioned detected components type can be selected according to situation, can be three kinds, four kinds or five kinds etc.
The deterministic process of concrete early warning progressive operation is as follows,
1). when meet C < C0 and V < V0 time, indication transformer is normal, then advanced warning grade is normal condition, does not carry out three-ratio method computing judgement;
2). when meet C0 < C < C1 and V < V0 time, may Hidden fault be there is 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, postponing certain t time, to carry out secondary detection be again time span in order to increase detection, ensure can not be subject to the impact of other factors to improve precision when detecting, if still meet C0 < C ' < C1 and V0 < V ' < V1, now show the fault that there is slower development, affect comparatively slight, then advanced warning grade is minor failure, selectively do not carry out three-ratio method computing judgement,
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 medium outage, then advanced warning grade is medium outage, now need to carry out artificially or automatically judge whether that carrying out three-ratio method computing carrys out concrete failure judgement type,
4). when meet C1 < C and V1 < V 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 C1 < C ' and V1 < V ', now show to exist the catastrophic failure worsened comparatively rapidly, then advanced warning grade is catastrophic failure, now need to carry out artificially or automatically judge whether that carrying out three-ratio method computing carrys out concrete failure judgement type.
Finally, after above-mentioned prealarming process completes, carry out artificially based on early warning result or automatically determine whether that needing to carry out three-ratio method coding judges, when early warning result be medium outage or catastrophic failure time just carry out above-mentioned judgement, when not needing to carry out three-ratio method operation, only draw early warning result, then return end and continue to carry out cycle detection; When needs carry out the concrete failure judgement type of three-ratio method computing, start three-ratio method coding judge module, five characteristic gas component numerical value needed for extraction carry out corresponding fault type judgement.Do not repeat the specific implementation process of three-ratio method herein.
As mentioned above, the transmitting transformer control system of improvement three-ratio method of the present invention achieves the improvement to three-ratio method, by comprising the pre-alarm detection module of elementary concentration early warning operation and early warning progressive operation, optimize the early warning fail operation pattern of transformer control system, decrease the probability of the erroneous judgement maloperation caused due to a variety of causes, ensure that the accuracy exporting alert status, the method simultaneously also judged by secondary detection is achieved and detects the further checking of fault pre-alarming at different levels, enhances application and the reliability of early warning.
In addition, the present invention gives the oil immersed type transmitting transformer above-mentioned control device being carried out embody rule, this oil immersed type transmitting transformer structural representation as shown in Figure 3, 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.
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 (1)
1. one kind is improved the transmitting transformer control system of three-ratio method, it comprises transmitting transformer ECU unit, memory unit, three detection modules, three-ratio method coding judge module and early 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, three-ratio method coding judge module is connected with ECU unit, accept the steering order of ECU unit and feed back various signal to ECU unit, memory unit judge module of encoding with ECU unit and three-ratio method is respectively connected, and the early warning signal that early warning and display unit are responsible for ECU unit exports carries out outside Graphics Processing;
Wherein said concentration of component detection module can the concentration of each component of each gas 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 early warning progressive operation;
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 represent transformer total hydrocarbon content first threshold and Second Threshold respectively, V0, V1 represent the absolute gas production rate first threshold of total hydrocarbon and Second Threshold respectively, judge by contrast transformer total hydrocarbon content C and the numerical relation between total hydrocarbon absolute gas production rate V and above-mentioned threshold value the early warning result drawing different brackets;
The deterministic process of concrete early warning progressive operation is as follows,
1), when meet C < C0 and V < V0 time, indication transformer is normal, then advanced warning grade is normal condition, does not carry out three-ratio method computing judgement;
2), when meet C0 < C < C1 and V < V0 time, may Hidden fault be there is 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, postponing certain t time, to carry out secondary detection be again time span in order to increase detection, ensure can not be subject to the impact of other factors to improve precision when detecting, if still meet C0 < C ' < C1 and V0 < V ' < V1, now show the fault that there is slower development, affect comparatively slight, then advanced warning grade is minor failure, selectively do not carry out three-ratio method computing judgement,
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 medium outage, then advanced warning grade is medium outage, now need to carry out artificially or automatically judge whether that carrying out three-ratio method computing carrys out concrete failure judgement type,
4), when meet C1 < C and V1 < V 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 C1 < C ' and V1 < V ', now show to exist the catastrophic failure worsened comparatively rapidly, then advanced warning grade is catastrophic failure, now need to carry out artificially or automatically judge whether that carrying out three-ratio method computing carrys out concrete failure judgement type,
Described transmitting transformer ECU unit carries out artificially based on above-mentioned early warning result or automatically determines whether that needing to carry out three-ratio method coding judges, when needs carry out the concrete failure judgement type of three-ratio method computing, start three-ratio method coding judge module, the characteristic gas component numerical value needed for extraction carries out corresponding fault type judgement;
C1＝2～3C0，V1＝2～3V0。
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| CN113900018A (en) * | 2021-10-12 | 2022-01-07 | 云南电网有限责任公司电力科学研究院 | Transformer tap switch fault detection method |
| CN117347917A (en) * | 2023-10-09 | 2024-01-05 | 国网黑龙江省电力有限公司大庆供电公司 | Power transmission transformer thermal fault detection system |
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| CN117347917A (en) * | 2023-10-09 | 2024-01-05 | 国网黑龙江省电力有限公司大庆供电公司 | Power transmission transformer thermal fault detection system |
| CN117347917B (en) * | 2023-10-09 | 2024-05-03 | 国网黑龙江省电力有限公司大庆供电公司 | Power transmission transformer thermal fault detection system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105548796A (en) | 2016-05-04 |
| CN105527555B (en) | 2018-06-19 |
| CN105606969B (en) | 2018-06-19 |
| CN105606969A (en) | 2016-05-25 |
| CN105527555A (en) | 2016-04-27 |
| CN104090079A (en) | 2014-10-08 |
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