π type current transformer using thin magnetic wire

Generally there are two methods of measuring heavy currents of high tension lines, electrical and optical ones [1]. One electrical method makes use of a thin magnetic wire with uniaxial anisotropy, a wire which has bi-stable states of 0 or π, depending on the direction of an external magnetic field. The Thin Magnetic Transformer (TMT) using a thin magnetic wire has been developed for this use and analyzed theoretically and experimentally in terms of input and output levels, frequency, a number of coil turns and so on. As one of its applications, a current transformer (CT), named π Type CT in our laboratory, has been built and tested. According to the trial set, it is clarified to be stable under extreme temperatures.