ABB Relion 620 Series - Shunt Capacitor Bank Switching Resonance Protection, Current Based SRCPTOC794

4.12.2.9 Technical data
Table 758: CUBPTOC 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
Typically 26 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Operate time accuracy in definite time mode 1 % of the theoretical value or ±20 ms
Operate time accuracy in inverse definite mini-
mum time mode
5 % of the theoretical value or ±20 ms
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2,3,4,5,..
4.12.2.10 Technical revision history
Table 759: CUBPTOC Technical revision history
Technical revision Change
B Selection name for Recorded unbalance
changed.
4.12.3 Shunt capacitor bank switching resonance protection,
current based SRCPTOC
4.12.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE
C37.2 device
number
Shunt capacitor bank switching
resonance protection, current
based
SRCPTOC TD> 55TD
4.12.3.2 Function block
Figure 415: Function block symbol
1
Fundamental frequency current = 1.0 × I
n
, current before fault = 0.0 × I
n
, fault current = 2.0 × Start
value , results based on statistical distribution of 1000 measurements
2
Includes the delay of the signal output contact
Protection functions 1MRS757644 H
794 620 series
Technical Manual