XU Yu-yu, ZHENG Yi, WANG Xiao-hua, et al. Design of Power Supply for On-line Monitoring Contact-type Temperature Sensor in Switchgear[J]. High voltageapparatus, 2004, (6): 424-426.
XU Yu-yu, ZHENG Yi, WANG Xiao-hua, et al. Design of Power Supply for On-line Monitoring Contact-type Temperature Sensor in Switchgear[J]. High voltageapparatus, 2004, (6): 424-426.DOI:
How to power the contact-type temperature sensor is a main problem for its application in high voltage switchgear. This paper introduces a method which utilizes magnetic saturation principle to solve the problem. A kind of current transformer is installed around the inside bus bar. It is excited normally when lower current passes through it; and saturated when higher current. Therefore
the dimensions of iron-core of current transformer can be calculated to meet the power supply requirement of the sensor at the front end
providing a stable power source for the subsequent circuit.