Earth-Fault Protection; Non-Directional Earth-Fault Protection Efxptoc (Ansi 51G/51N-1, 51G/51N-2, 50G/50N) - ABB RELION REX640 Technical Manual

Protection functions
4.1.12.10 Technical data
Table 501: GSLPTOC Technical data
Characteristics
Operation accuracy
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy
4.2

Earth-fault protection

4.2.1 Non-directional earth-fault protection EFxPTOC (ANSI
51G/51N-1, 51G/51N-2, 50G/50N)
4.2.1.1 Identification
Function description
Non-directional earth-fault protec-
tion, low stage
Non-directional earth-fault protec-
tion, high stage
Non-directional earth-fault protec-
tion, instantaneous stage
4.2.1.2 Function block
Figure 252: Function block
1
Current before fault = 0.0 x I
injected, results based on statistical distribution of 1000 measurements
2
Includes the delay (≈0ms) of the static signal output (SSO)
440
Value
Depending on the frequency of the measured current f
±1.5% of the set value or ±0.03 × I
1, 2
Typically 30ms
<30 ms
Typically 0.96
<50 ms
±1.0% of the set value of ±20 ms
, f = 50 Hz, nominal frequency fault current 1.1 x set
n n
IEC 61850 IEC 60617
identification identification
EFLPTOC Io>
EFHPTOC Io>>
EFIPTOC Io>>>
1MRS759142 F
±2 Hz
n
n
ANSI/IEEE C37.2
device number
51G/51N-1
51G/51N-2
50G/50N
Start value is
REX640
Technical Manual