Multifrequency Admittance-Based Earth-Fault Protection (Mfadpsde); Wattmetric-Based Earth-Fault Protection (Wpwde) - ABB REX640 Product Manual

REX640
Product version: 1
Table 64. Multifrequency admittance-based earth-fault protection (MFADPSDE)
Characteristic
Operation accuracy
1)
Start time
Reset time
Operate time accuracy
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
Directional mode
Voltage start value
Operate delay time
Operating quantity
Min operate current
Operation mode
Peak counter limit
Table 66. 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 × U
based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
50
Function
MFADPSDE
MFADPSDE
MFADPSDE
MFADPSDE
MFADPSDE
MFADPSDE
MFADPSDE
= phase to earth voltage during earth fault in compensated or un-earthed network, the residual power value before fault = 0.0 pu, f
n
Value
Depending on the frequency of the measured voltage:
f ±2 Hz
n
±1.5% of the set value or ±0.002 × U
Typically 35 ms
Typically 40 ms
±1.0% of the set value or ±20 ms
Value (Range)
2 = Forward
3 = Reverse
0.01...1.00 × U
n
60...1200000 ms
1 = Adaptive
2 = Amplitude
3 = Resistive
0.005...5.000 × I
n
1 = Intermittent EF
2 = Transient EF
3 = General EF
4 = Alarming EF
2...20
Value
Depending on the frequency of the measured current: f
Current and voltage:
±1.5% of the set value or ±0.002 × I
Power:
±3% of the set value or ±0.002 × P
Typically 63 ms
Typically 40 ms
Typically 0.96
±1.0% of the set value or ±20 ms
±5.0% of the set value or ±20 ms
-50 dB at f = n × f , where n = 2,3,4,5,...
n
1MRS759144 A
n
Step
-
0.01
10
-
0.001
-
1
±2 Hz
n
n
n
= 50 Hz, results
n
ABB