ABB Relion 620 Series - Unbalance Protection; Negative-Sequence Overcurrent Protection NSPTOC

Name Type Values (Range) Unit Description
ID_C FLOAT32 0.00...80.00 xln Differential current
phase C
MHZPDIF Enum
1=on
2=blocked
3=test
4=test/blocked
5=off
Status
4.3.6.11 Technical data
Table 538: MHZPDIF Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the current measured: f
n
±2
Hz
±1.5% of the set value or ±0.002 x I
n
Operate time , Minimum Typical Maximum
I
Fault
= 2.0 × set Start Value
(one phase fault)
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
4.4.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative-sequence overcurrent
protection
NSPTOC I2> 46
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.
1MRS757644 H Protection functions
620 series
Technical Manual
609