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Although the transfer function (TF) method is widely used to detect deformation and displacement of power transformer windings, the sensitivity to minor defects is affected by several factors. This paper presents the influence of temperature on the TF of transformer windings. Nanosecond pulse was used to extending the frequency band of the measurement system. The experiment was carried on a purpose-made...
A multipoint fiber-optic temperature sensor network integrated inside a power transformer for continuous monitoring of hot-spots on windings, cellulose insulations, and oil, is demonstrated and tested. The temperature sensors are based on proprietary encapsulated fiber Bragg grating (FBG) sensors and the optical interrogation unit uses a special designed narrowband high power broadband fiber source...
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