科研之友
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摘要
Accurate measurement of localised flux inside transformer cores is useful for studying core design and assembly problems. Usually holes are drilled through laminations and thin gauge wire is threaded through them to make enwrapping search coils. Holes drilled in the steel and air-gaps created by introducing wires between laminations make the technique unsuitable for measurements throughout the life of a transformer core. Physical vapour deposition (PVD) was used to create an insulation layer and conductive tracks on sheets and laminations of grain oriented 3% SiFe to form localised thin film flux sensors. The laminations were inserted into a three-phase, 350 kVA distribution core to measure the internal flux distribution. The localised flux density measured with the thin film sensors agreed within +/- 5% of that measured under similar conditions using the conventional search coils. The difference was highest when measuring flux in the core at high flux density and this was attributed to an error in the thin film sensor outputs due to interlaminar flux in the core.
- 出版日期2013-1
