3.4 THROUGH FAULT MONITORING
Overcurrent pick-up Setting +/-5% or 50 mA, whichever greater
Overcurrent drop-off 0.95 x setting +/- 5% or 50 mA, whichever is greater
Heating pickup (I2t)
Setting +/-2% or 5 A
2
s, whichev
er greater
3.5 THERMAL OVERLOAD
Hotspot pick-up
Expected pick-up time +/-5% or 50 ms, whichever greater.
(Expected pick
-up time is the time required to reach the temperature
setting)
Hotspot operate DT +/-5% or <= 50 ms, whichever greater
Top Oil pick-up Expected pick-up time +/-5% or 50 ms, whichever greater
Top Oil operate DT +/-5% or <= 50 ms, whichever greater
Repeatability < 2.5%
3.6 LOW IMPEDANCE RESTRICTED EARTH FAULT
Pick-up Formula +/-5%
Drop-off 0.9 x formula +/- 5%
Pick-up and drop-off repeatability < 5%
Operate time < 45 ms (currents applied at 2x pickup level or higher)
Operate time repeatability < 5 ms
Disengagement time < 30 ms
3.7 HIGH IMPEDANCE RESTRICTED EARTH FAULT
Pick-up Formula +/-5%
Drop-off 0.9 x formula +/- 5%
Pick-up and drop-off repeatability < 5%
Operate time < 30 ms
Operate time repeatability < 5 ms
Disengagement time < 30 ms
Chapter 21 - Technical Specifications P64x
460 P64x-TM-EN-1.3
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