ABB RELION 630 Series Product Manual page 32

Generator Protection and Control
REG630
Product version: 1.3
Table 42. High-impedance based restricted earth-fault protection (HREFPDIF)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
1) Current before fault = 0.0 × I , f = 50 Hz
n n
2) Includes the delay of the signal output contact
Table 43. High-impedance based restricted earth-fault protection (HREFPDIF) main settings
Parameter
Operate value
Minimum operate time
Table 44. Rotor earth-fault protection (MREFPTOC)
Characteristic
Operation accuracy
Start time 1)2)
Reset time
Reset ratio
Retardation time
Operate time accuracy
Suppression of harmonics
1) Current before fault = 0.0 × I , f = 50 Hz, earth-fault current with nominal frequency injected from random phase angle, results based on statistical distribution of 1000 measurements
n n
2) Includes the delay of the signal output contact
Table 45. Rotor earth-fault protection (MREFPTOC) main settings
Parameter
Alarm start value
Operate start value
Alarm delay time
Operate delay time
32
I = 2.0 × set Operate value
Fault
Operate value
I = 10.0 × set
Fault
Function
HREFPDIF
HREFPDIF
Function
MREFPTOC
MREFPTOC
MREFPTOC
MREFPTOC
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 × I
Typically 22 ms (±5 ms)
Typically 15 ms (±5 ms)
<60 ms
Typically 0.96
<60 ms
±1.0% of the set value or ±20 ms
Value (Range)
0.5...50.0%
0.020...300.000 s
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 × I
Typically 25 ms (±15 ms)
<50 ms
Typically 0.96
<50 ms
±1.0% of the set value of ±20 ms
-50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
Value (Range)
0.010...2.000 pu
0.010...2.000 pu
0.04...200.00 s
0.04...200.00 s
1MRS757583 C
n
Step
0.1
0.001
n
Step
0.001
0.001
0.01
0.01
ABB