4.17 Sensitive Earth Fault Protection (ANSI 51GN, 64R)
331
7UM61 Manual
C53000-G1176-C127-3
4.17 Sensitive Earth Fault Protection (ANSI 51GN, 64R)
Setting Ranges / Increments
Times
Dropout Ratios
Tolerances
Influencing Variables
Pickup Current I
EE
> 2 mA to 1000 mA Increments 1 mA
Delay time T
IEE
> 0.00 s to 60.00 s
or ∞ (ineffective)
Increments 0.01 s
Pickup Current I
EE
>> 2 mA to 1000 mA Increments 1 mA
Delay time T
IEE
>> 0.00 s to 60.00 s
or ∞ (ineffective)
Increments 0.01 s
Measuring circuit Supervision when Used as
Rotor Earth Fault Protection I
EE
<
1.5 mA to 50.0 mA or 0.0
mA (ineffective)
Increments 0.1 mA
Pickup Times approx. 50 ms
Dropout Times approx. 50 ms
Measuring Circuit Supervision (Delay) approx. 2 s
Pickup currents I
EE
>, I
EE
>> approx. 0.95 or 1 mA
Measuring Circuit Supervision I
EE
< approx. 1.10 or 1 mA
Pickup current 1 % of setting value or 0.5 mA
Time Delay 1 % of setting value or 10 ms
Power Supply DC Voltage in Range
0,8 ≤ U
PS
/U
PSN
≤ 1.15
≤ 1 %
Temperature in Range
23°F or –5 °C ≤ Θ
amb
≤ 131°F or 55 °C
≤ 0.5 % / 10 K
Frequency in Range
0,95 ≤ f/f
N
≤ 1.05
≤ 1 %
Harmonics
- Up to 10 % 3rd harmonic
- Up to 10 % 5th harmonic
≤ 1 %
≤ 1 %
Note: For the purpose of high sensitivity, the linear range of the measuring input for the sensi-
tive ground fault acquisition is from 2 mA to 1600 mA.
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