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Online impulse frequency response analysis (IFRA) is an advanced method for detecting winding faults in transformers. In this method, square wave impulse is commonly used as the excitation signal. In theory, the frequency response curve of a transformer is not related to the excitation signal. However, it is discovered that the test results can be influenced by the input impulse. The influence may...
Frequency response analysis (FRA) is a regular method to detect winding faults in transformer. According to the kind of excitation source, it can be divided into two categories that are impulse frequency response analysis (IFRA) and sweep frequency response analysis (SFRA). Compared with SFRA, IFRA use less time during test and can reach higher frequency domain it's about 10MHz, with SFRA usually...
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