Siemens SIPROTEC 7UM62, Manual

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4.7 Differential Protection for Generators and Motors (ANSI 87G/87M)
417
7UM62 Manual
C53000-G1176-C149-3
4.7 Differential Protection for Generators and Motors (ANSI 87G/87M)
Setting Ranges/
Resolutions 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 (Increments 0.1)
or
∞
(no trip)
Pickup
Characteristic 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)
Start Detection I / I
N Gen
0.00 to 2.,00 (Increments 0.01)
Factor for Increase of Characteristic
at Start
1.0 to 2.0 (Increments 0.1)
Max. Permissible Starting Time 0.0 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)
⋅
dur. of period (system frequ.)
or
∞
(does not expire)
Tripping time delay 0.00 s to 60.00 s (Increments 0.01 s)
for I
DIFF
> and I
DIFF
>> or
∞
(ineffective)
Pickup Times without parallel operation of other protection functions
Dropout/Pickup Ratio Approx. 0.7
Tolerances With Preset Transformer Parameters
– Pickup Characteristic
±
3 % of setpoint value (for I < 5
⋅
I
N
)
– Additional Delay Time
±
1 % of setting value or 10 ms
Influencing
Variables for
Pickup Power Supply Direct Voltage in Range
0.8
≤
V
PS
/ V
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 % (see also Figure 4-7)
50 Hz 60 Hz
−
with
≥
1.5
⋅
setting
I
DIFF
>/
I
N Gen
, approx.
35 ms 35 ms
−
with
≥
1.5
⋅
setting
I
DIFF
>>/
I
N Gen
, approx.
25 ms 22 ms
−
with
≥
5
⋅
setting
I
DIFF
>>/
I
N Gen
, approx.
18 ms 17 ms