Inspite of best efforts, no state electricity board can ensure constant voltage to the customer because of long and inadequate distribution lines rind irregular load pattern on distribution transformers. Generally Voltage is low during day time and high during night boors. Moreover on holiday, peak hours, rainy days and when agricultural and Industrial load is switched off, the voltage rises sharply which is more dangerous.
This higher current affects the electrical motors particularly smaller capacity motors upto 7.5 H.in three ways
- Higher Current produces higher loses in electrical motors which causes premature failure of winding
- These higher loses of electric motors also increases the loses of cables, switches, transformers and other associated equipment
- For smooth continuous operation of motors, over load relays arc usually set it higher setting
With the installation of the stabilizer and maintaining 390/400 volts, the motor will operate smoothly drawing 15-20% lesser current and correspondingly the relay setting can he reduced by 15-20%. In case single phasing occurs, the relay will trip 40-50 seconds. The motor can withstand the high current for this period and will be safe.