Figure 5-7. Overvoltage Relay K102, Test Setup
Connect a variable 0 to 160V AC source
and variable frequency (50 to 60 Hz) source
to terminals 1 and 2 with switch S1 in series.
Connect lamp DS1 and 24V DC power
supply in series with switch S2 to terminals
3 and 4, also with terminals 7 and 8 (DS2).
Adjust AC power supply to 120 volts, 60 Hz.
With S1 and S2 closed, lamp DS1 shall
extinguish and DS2 shall light.
Reduce voltage slowly to 104 volts and hold
for 2 minutes. Lamp DS1 and DS2 shall
Reduce voltage to 99 volts. DS1 and DS2
shall transfer states within 4 to 8 seconds.
Increase voltage slowly to 113 volts. Lamps
DS1 and DS2 shall transfer states.
Reduce voltage to 48 volts. Transfer of
Reduce frequency to 50 Hz and repeat the
procedures in steps (c) through (h) with the