Design of Distribution Protection for Motor Cooling Fans in Low-voltage Frequency Conversion Circuits of TN Systems
The motor cooling fans in 0.4 kV low-voltage frequency conversion distributing circuits of TN systems have dis-advantageous features such as low capacity and small sectional area the corresponding cable.This paper discusses the de-sign of its distribution protection,with an emphasis on indirect contact shock prevention for distant distributing circuits.With respect to practical electric designs,the paper recommends the use of the approximate calculating formula of mini-mum ground fault current to deduce the maximum protective distribution distance for circuits with breakers or fuses as protective components.
frequency conversion circuitcooling fanindirect contact preventionground fault relaycircuit breakerfuse
万方数据
维普
