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Study on Grading Assessment Model for Power Transformer Operation Condition

Author: LuoSiJia
Tutor: LiaoRuiJin
School: Chongqing University
Course: Electrical Engineering
Keywords: Power transformers Condition assessment Gray Ideal Solution Accelerated aging Range extenics
CLC: TM41
Type: Master's thesis
Year: 2008
Downloads: 265
Quote: 6
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Abstract


As the the hub equipment power transformers of the power system, the operational reliability and the security and stability of the system are closely related. For a long time, the transformer of the periodic maintenance system, prone to over-repair \With the progress of the condition monitoring technology, based on the state to run the state maintenance system to replace regular maintenance has become the development direction of transformer maintenance. The operation of the transformer condition assessment is a multi-index evaluation, established the index system of the points charged assessment and blackouts assessment levels, state comprehensive natural deterioration and accelerated aging mode, and the range extenics transformer operation status grading and assessment model for in-depth study. Preventive tests, considering the maintenance history, factors such as operating conditions, attachment status, operating environment and visual inspection at the index data obtained transformer power outage the basis of assessment of the sub-charged power outage assessment levels The index system. Index for judging the right to re-subdivided to establish constant weight A, according to the indicators state the amount of information contained in the number and impact on safety, reliability and reflect the sensitivity of the state according to the index data measured to establish constant weight B. On this basis, the use of chromatography analysis method and gray relational ideal solution for calculation of indicators often the right the expert qualitative description of the relative importance of the indicators to quantitative calculation, and close to the weighting scheme with the ideal solution and negative ideal solution for the gray relational degree from the expectations and do not expect the pros and cons of the two cases to consider multiple weights weighting scheme integrated. The introduction of variable weights based on balanced function mode, considering the balance between the index and the right to often be corrected according to the size of the actual data deviate from the normal, variable weight. According to the state of deterioration of the speed of the transformer under normal and adverse operating conditions, the two modes of natural deterioration and accelerated aging; and the introduction of the concept of threat coefficient from oil chromatography, moisture, internal hot spot temperature and load way table card, on this basis of the assessment model, natural deterioration and accelerated aging mode selection problem. Consider the error of measurement and interference data, index data is extended to an interval, and the problem of assessment error prone indicators for the evaluation of multi-index incompatible, the introduction of a domain based on interval Extension Method for Evaluating the establishment of transformer running state of the multi-index comprehensive integrated assessment of matter-element model, the case study shows that created by operation of the transformer condition assessment model can effectively combine the various state parameters can be more accurate assessment of the state of operation of the transformer. Grading and assessment of the model can effectively reduce outage time and evaluation workload, integrated natural deterioration and accelerated aging mode solves the problem of assessment of the state of the transformer under different operating conditions.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Power transformers
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