All the line voltages are monitored and sensed simultaneously using three independent
scale down potential transducer this low level ac signal is subjected to signal condition,
which includes surge suppressors and harmonic filter, filtered signal is fed to the ADC of the
industrial grade pic micro controller, When the sensing voltage level exceeds the user set
value f or under or over voltage, Digital Microcontroller based definite-time under voltage
(uv) and over voltage (ov) relay/line voltage monitor(LVM) gives an output signal in the form
of relay change over for tripping/alarming.