45
—
Table 38. Admittance-based earth-fault protection (EFPADM)
Characteristic
Value
Operation accuracy
At the frequency f = f
n
±1.0% or ±0.01 mS
(In range of 0.5...100 mS)
Start time
1) 2)
Minimum
Typical
Maximum
56 ms
60 ms
64 ms
Reset time
40 ms
Operate time accuracy i
±1.0% of the set value or ±20 ms
Suppression of harmonics
-50 dB at f = n × fn, where n = 2, 3, 4, 5,…
1) Uo = 1.0 × U
n
2) Includes the delay of the signal output contact, results based on statistical distribution of 1000 measurements
—
Table 39. Admittance-based earth-fault protection (EFPADM) main settings
Parameter
Function
Value (range)
Step
Voltage start value
EFPADM
0.01...2.00 × U
n
0.01
Directional mode
EFPADM
1 = Non-directional
2 = Forward
3 = Reverse
-
Operation mode
EFPADM
1 = Yo
2 = Go
3 = Bo
4 = Yo, Go
5 = Yo, Bo
6 = Go, Bo
7 = Yo, Go, Bo
-
Operate delay time
EFPADM
60...200000 ms
10
Circle radius
EFPADM
0.05...500.00 mS
0.01
Circle conductance
EFPADM
-500.00...500.00 mS
0.01
Circle susceptance
EFPADM
-500.00...500.00 mS
0.01
Conductance forward
EFPADM
-500.00...500.00 mS
0.01
Conductance reverse
EFPADM
-500.00...500.00 mS
0.01
Susceptance forward
EFPADM
-500.00...500.00 mS
0.01
Susceptance reverse
EFPADM
-500.00...500.00 mS
0.01
Conductance tilt Ang
EFPADM
-30...30°
1
Susceptance tilt Ang
EFPADM
-30...30°
1
—
Table 40. 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 × fn, 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