Siemens 7SJ82 - Differential Protection for Capacitor Banks

Differential Protection for Capacitor Banks
Setting Values
Operate curve
Threshold value I/I
Rated,obj
0.05 to 2.00 Increments of 0.01
Slope 1 0.00 to 0.80 Increments of 0.01
Intersection 1 Irest I/I
Rated,obj
0.00 to 5.00 Increments of 0.01
Slope 2 0.25 to 0.95 Increments of 0.01
Intersection 2 Irest I/I
Rated,obj
1.00 to 20.00 Increments of 0.01
Startup detection
Startup detection threshold value I/I
Rated,obj
0.1 to 2.0 Increments of 0.1
Characteristic curve increase factor 1.0 to 5.0 Increments of 0.1
Maximum starting time 0.1 s to 180.0 s Increments of 0.1 s
DC-component detection
Characteristic curve increase factor
DC
1.0 to 5.0 Increments of 0.1
Inrush-current detection
2nd harmonic content 10 % to 45 % Increments of 1%
Crossblk. time 2nd har. 0.00 s to 200.00 s or ∞ Increments of 0.01 s
Detection of external faults
Add-on stabilization threshold value I/I
Rated,obj
1.00 to 20.00 Increments of 0.01
Add-on stabilization time 0.00 s to 5.00 s or ∞ Increments of 0.01 s
Crossblk. time additional stabilization 0.00 s to 2.00 s or ∞ Increments of 0.01 s
Operate curve See figure Figure 12-17
I-DIFF Fast
Threshold value
I/I
Rated,obj
0.5 to 35.0 Increments of 0.1
Tripping delay 0.00 s to 60.00 s Increments of 0.01 s
I-DIFF Unrestrained
Threshold value
I/I
Rated,obj
0.5 to 35.0 Increments of 0.1
Tripping delay 0.00 s to 60.00 s Increments of 0.01 s
Dropout Ratio
I-DIFF stage
Approx. 0.7
I-DIFF fast stage Approx. 0.8
I-DIFF unrestrained stage Approx. 0.7
Response Tolerance
For preset characteristic curve parameters; for 2 sides with 1 measuring point each
I-DIFF stage and characteristic curve 2 % of the setting value
I-DIFF fast stage 2 % of the setting value
Time Delays
I-DIFF stage
0.00 s to 60.00 s Increments of 0.01 s
12.28
Technical Data
12.28 Differential Protection for Capacitor Banks
SIPROTEC 5, Overcurrent Protection, Manual 1505
C53000-G5040-C017-8, Edition 07.2017