ABB RELION REX640 - 4.4 Unbalance protection; 4.4.1 Negative-sequence overcurrent protection NSPTOC (ANSI 46 M); 4.4.1.1 Identification; 4.4.1.2 Function block

4.3.8.12 Technical data
Table 733: MHZPDIF Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the measured current:
f
n
±2 Hz
±1.5% of the set value or 0.002 × I
n
Start time
1, 2
I
Fault
= 2.0 × set
Start Value (one
phase fault)
Minimum Typical Maximum
13 ms 17 ms 21 ms
I
Fault
= 2.0 ×
set Start Value
(three phases
fault)
11 ms 14 ms 17 ms
Reset time <40 ms
Reset ratio Typically 0.96
Retardation time <35 ms
Operate time accuracy in definite
time mode
±1.0% of the set value of ±20 ms
4.4 Unbalance protection
4.4.1 Negative-sequence overcurrent protection NSPTOC (ANSI
46M)
4.4.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative-sequence overcurrent pro-
tection
NSPTOC I2>M 46M
1
Measurement mode = “Peak-to-Peak”, current before fault = 0.0 × I
n
, f
n
= 50 Hz, fault current with
nominal frequency injected from random phase angle, results based on statistical distribution of
1000 measurements
2
Includes the delay of the signal output contact
1MRS759142 F Protection functions
REX640
Technical Manual
819