Optimizing methods for designing a robust fop current sensor to be installed in EHV power system

An optimization method for designing fibre-optic current sensors, suitable for EHV environment has been developed. Though the principles of current sensing were known earlier, suitable optimization of the designing methods are not available. The techniques discussed in this paper can be applied to ordinary single mode fibres. A modest amount of temperature insensitivity, 5 percent to be specific, has been achieved for a wide variation of temperature range: from 35 deg to 150 deg. The nonlinearity due to the residual linear birefringence (bending) has been kept below 1 percent. The designing methods can be applied to both bulk and fibre-optic sensors. The sensor designed has been used to capture switching waveform