Unbalance Protection - ABB RELION REX640 Technical Manual

1MRS759142 F
4.3.8.12 Technical data
Table 733: MHZPDIF Technical data
Characteristic
Operation accuracy
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite
time mode
4.4

Unbalance protection

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