ABB RED615 ANSI, Product Manual

Page: 40 / 68

Table 40. Wattmetric based earth-fault protection (WPWDE)
Characteristic Value
Operation accuracy 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
Start time
1)2)
Typical 63 ms
Reset time < 40 ms
Reset ratio Typical 0.96
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Operate time accuracy in IDMT mode ±5.0% of the set value or ±20 ms
Suppression of harmonics -50dB at F= n x fn, where n=2,3,4,5,…
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 Function Values (Range) Step
Directional mode WPWDE 2=Forward
3=Reverse
Current start value WPWDE 0.010...5.000 x I
n
0.001
Voltage start value WPWDE 0.010...1.000 x U
n
0.001
Power start value WPWDE 0.003...1.000 x P
n
0.001
Reference power WPWDE 0.050...1.000 x P
n
0.001
Characteristic angle WPWDE -179...180 deg 1
Time multiplier WPWDE 0.05...2.00 0.01
Operating curve type WPWDE Definite or inverse time
Curve type: 5, 15, 20
Operate delay time WPWDE 60...200000 ms 10
Min operate current WPWDE 0.010...1.000 x I
n
0.001
Min operate voltage WPWDE 0.01...1.00 x U
n
0.01
Line Differential Protection and Control 1MRS756500 F
RED615
Product version: 4.0
40 ABB