1MDU07205-YN rev. F
REF601 CEI
User’s manual
20
Technical data
Non-directional earth-fault protection
Low-set stage Io > Nominal value of earth current 1 A
Measurement range 0.025 In ...12.5 In
1)
Setting range for External earth
fault measurement
0.025..0.5 x In in steps of
0.0125, Excludable
Operate time at DT mode to > 0.1...1 sec insteps of 0.05
Accuracy of pick-up current ± 5% of set value
Accuracy of operate time :
DMT characteristic
± 5% of set value or ± 30
msec
Reset ratio 0.98
High-set stage
Io >>
Setting range 0.25...12.5 x In in steps of
0.25, Excludable
Operation mode Defi nite time
Operate time to >> 0.05...0.2 in steps of 0.05
Accuracy of pick-up current ± 15% of set value
Accuracy of operate time ± 5% of set value or ± 30 m
sec
Reset ratio 0.98
1) Earth current measurement makes use of the external core balance CT input for currents
upto 7 In.When the measured current exceeds 7 In , measurement switches from external
input to internal vector summation mode. Conversely, when the measured current reduces
to a level below 6 In, measurement switches from internal to external CT input mode.
The automatic swicthing of measurement modes, allows a wide dynamic measurement
range of 1 : 500 .
Transformer inrush detection
Inrush threshold value 0.2...20 x In
Ratio Setting 30%...50%
Degree of protection of fl ush-mounted relay
Front side
IP 42
Sides with connection terminal IP 20
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