Siemens SIPROTEC 7UM62 - 4.7 Differential Protection (ANSI 87 G;87 M;87 T) for Generators and Motors

Technical Data
4.7 Differential Protection (ANSI 87G/87M) for Generators and Motors
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
476
4.7 Differential Protection (ANSI 87G/87M) for Generators and Motors
Setting Ranges / Increments
Pickup Characteristic
Pickup Times
Tolerances
Differential current I
DIFF
>/I
N Gen
0.05 to 2.00 Increments 0.01
High-current stage I
DIFF
>>/I
N Gen
0.5 to 12.0
or ∞ (ineffective)
Increments 0.1
see also Figure 4-6
Slope 1 0.10 to 0.50 Increments 0.01
Base point 1 I/I
N Gen
0.00 to 2.00 Increments 0.01
Slope 2 0.25 to 0.95 Increments 0.01
Base point 2 I/I
N Gen
0.00 to 10.00 Increments 0.01
Startup recognition I/I
N Gen
0.00 to 2.00 Increments 0.01
Pickup Value Increase on Startup 1.0 to 2.0 Increments 0.1
Max. Starting Time 0.0 s to 180.0 s Increments 0.1 s
Add-on stabilization I/I
N Gen
2.00 to 15.00 Increments 0.01
Duration of Add-on stabilization (2 to 250) · Cycle duration (Network
frequency)
or ∞ (ineffective)
Tripping delay time for I
DIFF
> and I
DIFF
>> 0.00 s to 60.00 s
or ∞ (ineffective)
Increments 0.01 s
with single side feed (without parallel operation of other protection functions)
Dropout Ratio approx. 0.7
With preset parameters
- Pickup Characteristic ± 3 % of setpoint (for I < 5 · I
N
)
- Additional Delay Times ± 1 % of setting value or 10 ms