Siemens SIPROTEC 7UM62 - 4.9 Earth Current Differential Protection (ANSI 87 GN,TN)

Technical Data
4.9 Earth Current Differential Protection (ANSI 87GN,TN)
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
481
4.9 Earth Current Differential Protection (ANSI 87GN,TN)
Setting Ranges / Increments
Times
Dropout Ratios
Tolerances
Influencing Variables for Pickup Values
Differential current I-REF> I/I
N Obj
. 0.05 to 2.00 Increments 0.01
Characteristic: base point I/I
N Obj.
0.00 to 2.00 Increments 0.01
Characteristic: Slope 0.00 to 0.95 Increments 0.01
Delay times T 0.00 s to 60.00 s or ∞ (ineffective) Increments 0.01 s
Phase current blocking I> I/I
N Obj.
1.0 to 2.5 Increments 0.1
Zero Voltage Enable U0 1.0 V to100.0 V or 0 (ineffective) Increments 0.1V
Pickup Times
Dropout Times
approx. 25 ms to 55 ms
approx. 60 ms
Trip Characteristic approx. 0.90
Dropout Ratio approx. 0.95ms
Trip Characteristic 5 % of setpoint value or 0.02 I/InO
Phase Current Blocking I> 1 % of setting value or 0.01 I/InO
Zero Voltage Enable U0> 1 % of setting value or 0.5 V
Delay times T 1 % of setting value or 10 ms
Power supply direct voltage in range 0.8 ≤ U
Aux
/U
AuxN
≤ 1.15 ≤ 1 %
Temperature in range 23.00 °F (–5 °C) ≤ Θ
amb
≤ 131.00 °F (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 %