ABB RED615 Product Manual page 40

Line Differential Protection and Control
RED615
Product version: 4.0
Table 40. Wattmetric based earth-fault protection (WPWDE)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Operate time accuracy in definite time mode
Operate time accuracy in IDMT mode
Suppression of harmonics
1) Io varied during the test. Uo = 1.0 x Un = phase to earth voltage during earth-fault in compensated or un-earthed network. The residual power value
before fault = 0.0 p.u., fn = 50 Hz, results based on statistical distribution of 1000 measurement.
2) Includes the delay of the signal output contact.
Table 41. Wattmetric based earth-fault protection (WPWDE) main settings
Parameter
Directional mode
Current start value
Voltage start value
Power start value
Reference power
Characteristic angle
Time multiplier
Operating curve type
Operate delay time
Min operate current
Min operate voltage
40
Function
WPWDE
WPWDE
WPWDE
WPWDE
WPWDE
WPWDE
WPWDE
WPWDE
WPWDE
WPWDE
WPWDE
Value
Depending on the frequency of the current measured: fn
±2 Hz
Current and voltage: ±1.5 % of the set value or ±0.002 x
In Power: ±3 % of the set value or ±0.002 x Pn
Typical 63 ms
< 40 ms
Typical 0.96
±1.0% of the set value or ±20 ms
±5.0% of the set value or ±20 ms
-50dB at F= n x fn, where n=2,3,4,5,...
Values (Range)
2=Forward
3=Reverse
0.010...5.000 x I
n
0.010...1.000 x U
n
0.003...1.000 x P
n
0.050...1.000 x P
n
-179...180 deg
0.05...2.00
Definite or inverse time
Curve type: 5, 15, 20
60...200000 ms
0.010...1.000 x I
n
0.01...1.00 x U
n
1MRS756500 F
Step
0.001
0.001
0.001
0.001
1
0.01
10
0.001
0.01
ABB