4.22 Sensitive Earth Fault Protection (ANSI 51GN, 64R)
437
7UM62 Manual
C53000-G1176-C149-3
4.22
Sensitive Earth Fault Protection (ANSI 51GN, 64R)
Setting Ranges/
Resolutions
Overcurrent pick-up
I
EE
>
2 mA to 1000 mA
(Increments 1 mA)
Delay Time
T
IEE>
0.00 s to 60.00 s
(Increments 0.01 s)
or
∞
(does not expire)
Overcurrent Pick-Up
I
EE
>>
2 mA to 1000 mA
(Increments 1 mA)
Delay Time
T
IEE>>
0.00 s to 60.00 s
(Increments 0.01 s)
or
∞
(does not expire)
Measured Value Supervision
when Used as Rotor Earth
Fault Protection
I
EE
<
1.5 mA to 50.0 mA
(Increments 0.1 mA)
or 0.0 mA (ineffective)
Inherent Operating
Times
– Pickup Times
Approx. 60 ms
– Dropout Times
Approx. 50 ms
– Measured Value Supervision
Approx. 2 s
Dropout
Overcurrent Pick-Up
I
EE
>, I
EE
>>
Approx. 0.95 or 1 mA
Measured Value Superv. I
EE
<
Approx. 1.10 or 1 mA
Tolerances
Overcurrent Pick-Up
1 % of setting value or 0.5 mA
Delay Times T
1 % of setting value or 10 ms
Influencing
Variables for
Pickup
Power Supply Direct Voltage in Range
0.8
≤
U
PS
/ U
PS nominal
≤
1.15
1 %
Temperature in Range
23 °F
≤ ϑ
amb
≤
131 °F
0.3 % / 10 °F
–5 °C
≤ ϑ
amb
≤
55 °C
0.5 % / 10 K
Frequency in Range
0.95
≤
f/f
N
≤
1.05
< 1 %
Harmonic Currents
– Up to 10 % 3rd Harmonics
< 1 %
– Up to 10 % 5th Harmonics
< 1 %
Note: For the purpose of high sensitivity, the linear range of the measuring input for
the sensitive ground fault acquisition is from 2 mA to 1600 mA.
