大型电力变压器状态检修及常见故障分析（Analysis of state overhaul and common failure of large power transformer）.docVIP

大型电力变压器状态检修及常见故障分析（Analysis of state overhaul and common failure of large power transformer） Analysis of state overhaul and common failure of large power transformer Power transformer electronic transformer, the safe and stable operation of large power transformer is becoming more and more attention from all walks of life, especially network access of a growing number of large capacity transformer operation, a quantity of transformer faults, will affect the normal production and peoples normal life, but also service and repair of large transformer will bring great economic losses, in this case a transformer state maintenance, prevent the happening of the transformer accident, make the transformer in a controlled state run for a long time, avoid into transformer is damaged, the safe and reliable operation of the transformer has a certain practical significance. Analysis of the state of transformer operation Most of the large power transformers in operation are in normal state and only a few are temporarily in abnormal condition. In the state evaluation, there are two main categories: normal and abnormal. There are three types of transformer that can be considered for abnormal condition, and can be divided into three categories: tracking state; Maintenance status; Emergency repair status. 1.1 method of status evaluation (1) test project of status evaluation: transformer factory test, handover test (after installation or overhaul) and preventive test; For the status evaluation of the transformer in operation, the data of the factory test and the handover test are mainly based on the reliability test. The online detection and preventive test is the change of the discriminant state in comparison with the benchmark. The pilot projects for state assessment are: A measurement of local power discharge; The chromatographic analysis of dissolved gas in b oil; C moisture detection: including oil content, tg delta, insulation resistance and leakage current; D winding resistance