CN105717410A - Power transmission transformer control system - Google Patents
Power transmission transformer control system Download PDFInfo
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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 comprises a power transmission transformer ECU unit, a memory unit, three detection modules, a three-ratio method coding judging module and an early warning and display unit, wherein a component concentration detection module is capable of circularly detecting the concentration of each gas component and comparing each concentration value Di with a corresponding limit value Di0 of the gas component; a hydrocarbon content detection module and a gas production rate detection module determine early warning results of different levels by comparing a transformer total hydrocarbon content C and a total hydrocarbon absolute gas production rate V with corresponding thresholds; and based on the above early warning results, the power transmission transformer ECU unit automatically or manually judges whether three-ratio method coding judging is needed, if the three-ratio method operation is needed for specifically judging a fault type, the three-ratio method coding judging module is started to extract needed characteristic gas component values for carrying out corresponding fault type judgment.
Description
Technical field
The present invention relates to a kind of transmitting transformer improving three-ratio method and control system, belong to technical field of electric power transmission.
Background technology
Along with the expansion of the increase of power equipment capacity and electrical network scale, safe operation and power supply reliability to power system are had higher requirement, and the various countries' large-scale blackout in recent years occurred also has beaten alarm bell for China's power system.With a very important position in power system of transformator, is one of electrical equipment most important and the most expensive in power system, and the security reliability of its operation is directly connected to the safety and stablization of power system.Therefore, improve the transformator particularly large-scale power transformer reliability of operation safe and reliable operation tool to whole electrical network to be of great significance.Gases Dissolved in Transformer Oil analyzes the effective means that (DGA) technology is considered as Diagnosis for Power Transformer initial failure always.It can find the insulation fault that inside transformer exists in time, may advantageously facilitate by the transition to State Maintenance mode of the periodic maintenance mode, thus receives and be widely applied.The principle of DGA technology is based on the generation speed of any specific hydrocarbon gas and changes with temperature, and at a certain temperature, often has the factor of created gase of a certain gas maximum occur, along with temperature raises, the maximum gas of factor of created gase is followed successively by CH4, C2H6, C2H4, C2H2, H2, C0, CO2.
Have excellent heat radiation and insulating properties due to transformer oil, therefore oil-immersed power transformer is quoted widely in power system.In normal running, transformator can be slowly aging under the impact of mechanical stress and the various factors such as heat, electricity, and generates some imflammable gas.If transformator exists internal Hidden fault, the energy that trouble location discharges can accelerate the cracking of insulant, promotes the content of oil dissolved gas and gas production rate to be greatly improved.By obtaining transformer oil sample, adopt the method for gas chromatogram just can obtain the content of each component of oil dissolved gas, thus the health status of transformator is made assessment or abnormal transformator carries out the analysis of failure condition.
And three-ratio method is a kind of method carrying out transformer fault diagnosis according to the relative ratio of gas concentration.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 exists with trouble point temperature, chooses gas diffusivity from five kinds of characteristic gas components and does ratio at two kinds of gases that dissolved in insulating oil degree is similar.Three groups of ratios are chosen altogether according to above-mentioned method, respectively acetylene (C2H2)/ethylene (C2H4), methane (CH4)/hydrogen (H2), ethylene (C2H4)/ethane (C2H6), and three kinds of ratios are encoded by the coding rule (not shown) recommended according to directive/guide.Such as: time acetylene (C2H2)/ethylene (C2H4) is less than 0.1, coding settings is 0；Time acetylene (C2H2)/ethylene (C2H4) is more than or equal to 0.1 and less than 3, coding settings is 1；Time acetylene (C2H2)/ethylene (C2H4) is more than or equal to 3, coding settings is 2.After obtaining the coding of three kinds of ratios, fault type and possible failure cause just can be judged by fault type determination methods listed by directive/guide defined table easily.Due to this method in engineering simple and practical, therefore, adopt three-ratio method transmitting transformer control system oil-filled transformer fault diagnosis is had great significance.
Certainly, three-ratio method there is also obvious weak point, such as when each constituent content of gas and gas production rate are all without exceeding standard, running state of transformer is normal, three-ratio method diagnosis is invalid, only when gas content exceeds standard or gas production rate exceeds standard or has enough foundations to judge that transformator exists fault time, three-ratio method diagnosis just can be meaningful.Owing to there is error when oil dissolved gas is carried out sampling analysis test, bring certain impact so also can to the relative ratio of gas, it is possible to cause the inaccurate of diagnostic result.Therefore, when carrying out Chromatographic Analysis of Transformer oil test, test error must is fulfilled for the requirement of directive/guide defined, should avoid the various factor interference being likely to reduce precision as far as possible.
Therefore, it is necessary to the transmitting transformer adopting three-ratio method adopted at present is controlled system improve to improve the precision and stability of Transformer Fault Diagnosis, it is to avoid occur erroneous judgement operation to produce harmful effect.
Summary of the invention
In order to solve above-mentioned technical problem, the present invention proposes a kind of transmitting transformer improving three-ratio method and controls system, this transmitting transformer controls measurement inaccuracy or the instability that system can be avoided producing to the full extent because of multiple factors impact, early warning in advance can be carried out before carrying out three-ratio method monitoring, this early warning operating process can also the other early warning of classification exactly, it is possible to sent pre-alert notification before three-ratio method monitors the type that is out of order accurately.
For achieving the above object, the technology of the present invention is contemplated that, in order to avoid measuring the maloperation produced, farthest ensure the fault type accuracy of judgement degree of three-ratio method, except encoding judgement system except three-ratio method, introducing early warning system, the transmitting transformer of the present invention controls the early warning system of system and takes primary concentration early warning operation and early warning progressive operation two-stage judge process, and the technological means of employing is:
Scheme 1, a kind of transmitting transformer improving three-ratio method control system, it includes transmitting transformer ECU unit, memory unit, three detection modules, three-ratio method encodes judge module and early warning and display unit, described three detection modules include 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 control instruction of ECU unit and feed back various signals to ECU unit, memory unit encodes judge module with ECU unit and three-ratio method respectively and is connected, and early warning and display unit are responsible for that the early warning signal that ECU unit exports carries out outside display and are processed；
Wherein said concentration of component detection module can the concentration of the cycle detection each component of each gas, and each concentration value Di is compared successively with the ultimate value Di0 corresponding to this gas component, once the concentration obtaining the detection of this gas component goes beyond the limit of value, then carry out the counting operation of enumerator N, K is equaled or exceeded once enumerator N, then indicate that K group gas component is beyond ultimate value, then carry out starting early warning progressive operation；
Described hydrocarbon content detection module and gas production rate detection module detect transformator total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon respectively, C0, C1 represent transformator 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 different grades of early warning result by contrasting the numerical relation between transformator total hydrocarbon content C and total hydrocarbon absolute gas production rate V and above-mentioned threshold value；
Described transmitting transformer ECU unit manually or automatically determines a need for carrying out three-ratio method coding based on above-mentioned early warning result and judges, when needs carry out the concrete failure judgement type of three-ratio method computing, start three-ratio method coding judge module, extract required characteristic gas component numerical value and carry out corresponding fault type judgement.
Scheme 2, according to scheme 1 improve three-ratio method transmitting transformer control system, it is characterised in that each component of each gas includes H2, CH4, C2H4, C2H6, C2H2, total hydrocarbon.
Scheme 3, according to scheme 1 improve three-ratio method transmitting transformer control system, it is characterised in that under normal circumstances, K may be configured as K≤6, it is preferred to 3.
Scheme 4, according to scheme 1 improve three-ratio method transmitting transformer control system, it is characterised in that described early warning result is divided into normal condition, minor failure, medium outage and catastrophe failure, and 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 existing transmitting transformer and control the single level judgment model of system, improve the accuracy utilizing three-ratio method to judge transformer fault type；Optimize the early warning fail operation pattern of transformer control system, decrease the probability judging maloperation by accident owing to a variety of causes causes, ensure that the accuracy of output alert status, the method judged simultaneously also by secondary detection achieves verifies detection further to fault pre-alarmings at different levels, enhances application and the reliability of early warning system.
Accompanying drawing explanation
Fig. 1 is the transmitting transformer control system schematic 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 the transmitting transformer structural representation of the present invention.
Detailed description of the invention
As shown in Figure 1, the transmitting transformer improving three-ratio method of the present invention controls system and includes transmitting transformer ECU unit, memory unit, three detection modules, three-ratio method encodes judge module and early warning and display unit, described three detection modules include 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 control instruction of ECU unit and feed back various signals to ECU unit, memory unit encodes judge module with ECU unit and three-ratio method respectively and is connected, and early warning and display unit are responsible for that the early warning signal that ECU unit exports carries out outside display and are processed.
Described concentration of component detection module, hydrocarbon content detection module, gas production rate detection module is responsible for before starting three-ratio method coding judge module startup detection, detection, judgement defeated out of order early warning result, this early warning result can be divided into normal condition, minor failure, medium outage and catastrophe failure, generally, normal condition and minor failure are made without urgent process, only need continuous observation, and when medium outage and catastrophe failure occur, just judge concrete fault type further.That is, three-ratio method coding judge module is not generally operated, only after aforesaid early warning result occurs, just manually or automatically carried out triggering based on early warning result and started, such setting enormously simplify the application of three-ratio method, enrich simultaneously transmitting transformer control system function, just diagnose when needing the diagnosis carrying out fault type, it is not necessary to time only play general fault pre-alarming.Simultaneously in order to improve the reliability of fault pre-alarming, the method judged by secondary detection is achieved verifies detection further to fault pre-alarmings at different levels, enhances application and the reliability of early warning system.Below the transmitting transformer improving three-ratio method is controlled system to describe in detail:
Transformator can be subject to the impact of mechanical stress, temperature, highfield and the various factors such as moisture, oxygen in running, the various chemical reactions such as carbonization, cracking and oxidation can be there are in insulating oil under the effect of these factors, generate hydrogen, low molecular hydrocarbons 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 more minimal amount of gases, and the content of these gases also would generally be maintained within national regulations value.Once transformator occurs internal Hidden fault, the energy of trouble point release can accelerate insulating oil decomposes aerogenesis, it is possible to cause that gas concentration exceedes marginal value.And the source of Gases Dissolved in Transformer Oil is extremely complex, transformator under normal operating conditions also can electricity, thermal stress effect under generate a small amount of gas, when there is internal Hidden fault in transformator, the energy of trouble point release can accelerate the decomposition aerogenesis of insulant, may result in gas concentration over-limit condition, therefore can substantially 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 primary concentration early warning operation and early warning progressive operation two parts:
In primary 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 each concentration value Di and the ultimate value Di0 (D10 corresponding to this gas component, D20, D30, D40, D50, D60) compare successively, once the concentration obtaining the detection of this gas component goes beyond the limit of value, then carry out the counting operation of enumerator N, once enumerator N equals or exceeds K (under normal circumstances, N, K is integer and can arrange, K≤6, it is preferably 3) time, then indicate that K group gas component is beyond ultimate value, then carry out starting early warning progressive operation, if enumerator is not up to K value after being measured six groups of concentration, then enumerator can be at standby mode or reset wait next time detection instruction send.Consequently, it is possible to judged by multicomponent repeated detection, it is ensured that the accuracy of output early warning result, it is to avoid the mistake early warning that causes due to a certain gas component detection error.
Find through long-term operating experience, transformer fault usually starts with the low-yield fault of latency, the fault Free Development if leaving, the generation of transformator major accident may finally be caused, owing to gas concentration can only reflect, from a side, the running status that transformator is current, and gas production rate also reflects the out of order order of severity to a certain extent, in the early warning progressive operation process of the present invention, transformer state is carried out comprehensively objectively check and evaluation by bound gas concentration and gas production rate just.
Described hydrocarbon content detection module and gas production rate detection module detect transformator total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon respectively, C0, C1 represents transformator 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 by contrasting the numerical relation between transformator total hydrocarbon content C and total hydrocarbon absolute gas production rate V and above-mentioned threshold value, these advanced warning grades are divided into normal condition, minor failure, medium outage and catastrophe failure, find in research process simultaneously, the early warning of faults at different levels is also easier reduction erroneous judgement and accuracy in detection occur, therefore, the early warning system of the present invention achieves the raising to fault pre-alarming accuracys at different levels by the method that secondary detection judges.
Specifically, the transmitting transformer improving three-ratio method demonstrating the present invention as shown in Figure 2 controls working-flow sketch,
First early warning operating procedure is started, i value is set, K value and enumerator N reset, wherein i=1, i, K is integer, K≤6, it is preferably 3, concentration of component detection module detects each component (H2 of each gas, 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 component is beyond respective ultimate value Di0 (D10 successively, D20, D30, D40, D50, D60), once the gas component of correspondence goes beyond the limit of value, what then carry out enumerator N adds 1 operation, when enumerator N is be more than or equal to K, when namely going beyond the limit of the gas component quantity of value more than K, show that the primary concentration early warning operation of early warning system is complete, then launch into early warning progressive operation；
Described hydrocarbon content detection module and gas production rate detection module detect transformator 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, it is judged that draw corresponding fault level early warning.
Wherein it should be noted that the specifically chosen of C0, C1, V0, V1 can be obtained by empirical value, it is also possible to C0 and V0 to be chosen as empirical value, C1=2～3C0, V1=2～3V0.Above-mentioned detected components type can select according to situation, it is possible to is three kinds, four kinds or five kinds etc..
The judge process of concrete early warning progressive operation is as follows,
1). when meeting C < C0 and V < V0, indication transformer is normal, then advanced warning grade is normal condition, does not carry out three-ratio method computing judgement；
2). when meeting C0 < C < C1 and V < V0, indication transformer would be likely to occur Hidden fault, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' to determine whether, and need before secondary detection to postpone the t time, postponing certain t time, to carry out secondary detection again be the time span in order to increase detection, ensureing will not be affected by other factors to improve precision when detecting, if still meeting 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 meeting C0 < C < C1 and V0 < V < V1, indication transformer there may exist obvious fault, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' to determine whether, and need before secondary detection to postpone the t time, if still meeting C0 < C ' < C1 and V0 < V ' < V1, now show there is medium outage, then advanced warning grade is medium outage, now need manually or automatically to judge whether to three-ratio method computing and carry out concrete failure judgement type；
4). when meeting C1 < C and V1 < V, indication transformer there may exist obvious fault, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' to determine whether, and need before secondary detection to postpone the t time, if still meeting C1 < C ' and V1 < V ', now show there is the catastrophe failure worsened comparatively rapidly, then advanced warning grade is catastrophe failure, now need manually or automatically to judge whether to three-ratio method computing and carry out concrete failure judgement type.
Finally, after above-mentioned prealarming process completes, manually or automatically determine a need for carrying out three-ratio method coding to judge based on early warning result, above-mentioned judgement is just carried out when early warning result is medium outage or catastrophe failure, when being made without three-ratio method operation, only draw early warning result, then return end and be performed continuously over cycle detection；When needs carry out three-ratio method computing carry out concrete failure judgement type time, start three-ratio method coding judge module, extract five required characteristic gas component numerical value and carry out corresponding fault type judgement.What do not repeat three-ratio method implements process herein.
As mentioned above, the transmitting transformer improving three-ratio method of the present invention controls system and achieves the improvement to three-ratio method, by including the pre-alarm detection module of primary concentration early warning operation and early warning progressive operation, optimize the early warning fail operation pattern of transformer control system, decrease the probability judging maloperation by accident owing to a variety of causes causes, ensure that the accuracy of output alert status, the method judged simultaneously also by secondary detection achieves verifies detection further to fault pre-alarmings at different levels, enhances application and the reliability of early warning.
In addition, the present invention gives the oil immersed type transmitting transformer that above-mentioned control device carries out concrete application, this oil immersed type transmitting transformer structural representation is as shown in Figure 3, this transformator includes the transformer shell 1 covering whole transformator, it is connected to the insulation fuel tank 2 on transformer shell 1, transformator liner 3, and the major function part winding coil 4 of transmitting transformer and iron core 5, detecting device 6 and thermodetector 7 are positioned at transformer shell 1 top edges place, for carrying out the detection of related control data, it is positioned at insulating oil 10 and the air layer 11 of insulation fuel tank 2.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, it is appreciated that and these embodiments can be carried out multiple change, amendment, replacement and modification 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, enumerator N etc.) etc. implication be the accustomed meanings in this area, the scope of the invention and equivalency.The accompanying drawing simultaneously provided in description is only used as the convenience that description is understood, and claim is not carried out any restriction, and the simplification that flow chart is also made only as the convenience understood processes, and does not cause the defect etc. of insufficient disclosure.
Claims (1)
1. the transmitting transformer improving three-ratio method controls system, it includes transmitting transformer ECU unit, memory unit, three detection modules, three-ratio method encodes judge module and early warning and display unit, described three detection modules include 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 control instruction of ECU unit and feed back various signals to ECU unit, memory unit encodes judge module with ECU unit and three-ratio method respectively and is connected, and early warning and display unit are responsible for that the early warning signal that ECU unit exports carries out outside display and are processed；
Wherein said concentration of component detection module can the concentration of the cycle detection each component of each gas, and each concentration value Di is compared successively with the ultimate value Di0 corresponding to this gas component, once the concentration obtaining the detection of this gas component goes beyond the limit of value, then carry out the counting operation of enumerator N, K is equaled or exceeded once enumerator N, then indicate that K group gas component is beyond ultimate value, then carry out starting early warning progressive operation；
Described hydrocarbon content detection module and gas production rate detection module detect transformator total hydrocarbon content C and the absolute gas production rate V of total hydrocarbon respectively, C0, C1 represent transformator 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 to draw different grades of early warning result by contrasting the numerical relation between transformator total hydrocarbon content C and total hydrocarbon absolute gas production rate V and above-mentioned threshold value；
The judge process of concrete early warning progressive operation is as follows,
1), when meeting C < C0 and V < V0, indication transformer is normal, then advanced warning grade is normal condition, does not carry out three-ratio method computing judgement；
2), when meeting C0 < C < C1 and V < V0, indication transformer would be likely to occur Hidden fault, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' to determine whether, and need before secondary detection to postpone the t time, postponing certain t time, to carry out secondary detection again be the time span in order to increase detection, ensureing will not be affected by other factors to improve precision when detecting, if still meeting 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 meeting C0 < C < C1 and V0 < V < V1, indication transformer there may exist obvious fault, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' to determine whether, and need before secondary detection to postpone the t time, if still meeting C0 < C ' < C1 and V0 < V ' < V1, now show there is medium outage, then advanced warning grade is medium outage, now need manually or automatically to judge whether to three-ratio method computing and carry out concrete failure judgement type；
4), when meeting C1 < C and V1 < V, indication transformer there may exist obvious fault, now need to carry out secondary detection total hydrocarbon content C ' and absolute gas production rate V ' to determine whether, and need before secondary detection to postpone the t time, if still meeting C1 < C ' and V1 < V ', now show there is the catastrophe failure worsened comparatively rapidly, then advanced warning grade is catastrophe failure, now need manually or automatically to judge whether to three-ratio method computing and carry out concrete failure judgement type；
Described transmitting transformer ECU unit manually or automatically determines a need for carrying out three-ratio method coding based on above-mentioned early warning result and judges, when needs carry out the concrete failure judgement type of three-ratio method computing, start three-ratio method coding judge module, extract required characteristic gas component numerical value and carry out corresponding fault type judgement；
K≤6。
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