Characterization Analysis of Anti-impact Weak Current Sensor
Guohua Cao · Gaoya dianqi · 2013
The electrical equipment loss caused by the lightning and power's increasing demand is reduced by monitoring the extent of the surge protector failure using measuring its leakage current on-line.Proposed a method of monitoring the surge protector's failure degree online based on mutual inductance current sensor,established its mathematical model,analyzed the influence of coil turns,load resistance and stray capacitance on the effect of current sensor's measuring accuracy and impact resistance use lighting and tested current compound signal incentive after superposition.Experiments show: where the measured current range is 0.2~9 mA,the mutual inductance current sensor designed can resist the impact of 50 kA high current,the current measurement error can be less than 0.11 mA,and meet requirement of the leakage current on-line monitoring.