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