Table 64. Multifrequency admittance-based earth-fault protection (MFADPSDE)
Characteristic Value
Operation accuracy Depending on the frequency of the measured voltage:
f
n
±2 Hz
±1.5% of the set value or ±0.002 × U
n
Start time
1)
Typically 35 ms
Reset time Typically 40 ms
Operate time accuracy ±1.0% of the set value or ±20 ms
1) Includes the delay of the signal output contact, results based on statistical distribution of 1000 measurements
Table 65. Multifrequency admittance-based earth-fault protection (MFADPSDE) main settings
Parameter
Function Value (Range) Step
Directional mode MFADPSDE 2 = Forward
3 = Reverse
-
Voltage start value MFADPSDE 0.01...1.00 × U
n
0.01
Operate delay time MFADPSDE 60...1200000 ms 10
Operating quantity MFADPSDE 1 = Adaptive
2 = Amplitude
3 = Resistive
-
Min operate current MFADPSDE 0.005...5.000 × I
n
0.001
Operation mode MFADPSDE 1 = Intermittent EF
2 = Transient EF
3 = General EF
4 = Alarming EF
-
Peak counter limit MFADPSDE 2...20 1
Table 66. Wattmetric-based earth-fault protection (WPWDE)
Characteristic
Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
Current and voltage:
±1.5% of the set value or ±0.002 × I
n
Power:
±3% of the set value or ±0.002 × P
n
Start time
1)2)
Typically 63 ms
Reset time Typically 40 ms
Reset ratio Typically 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 -50 dB at f = n × f
n
, where n = 2,3,4,5,…
1) Io varied during the test, Uo = 1.0 × U
n
= phase to earth voltage during earth fault in compensated or un-earthed network, the residual power value before fault = 0.0 pu, f
n
= 50 Hz, results
based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
1MRS759144 A
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