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
