Characteristic Value
Operate time accuracy in definite
time mode
1 % of the theoretical value or ±20 ms
Operate time accuracy in IDMT
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,..
4.12.4 Shunt capacitor bank switching resonance protection,
current based, SRCPTOC (ANSI 55ITHD)
4.12.4.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Shunt capacitor bank switching res-
onance protection, current based
SRCPTOC TD> 55ITHD
4.12.4.2 Function block
Figure 638: Function block symbol
4.12.4.3 Functionality
The shunt capacitor bank switching resonance protection, current based, function
SRCPTOC is used for detecting three-phase resonance caused by capacitor
switching or topology changes in the network. The operating characteristic is a
definite time (DT).
SRCPTOC contains a blocking functionality. It is possible to block function outputs,
timers or the function itself.
4.12.4.4 Analog input configuration
SRCPTOC has one analog group input which must be properly configured.
Table 1087: Analog inputs
Input Description
I3P Three-phase currents
See the preprocessing function blocks in this document for the possible
signal sources.
Protection functions 1MRS759142 F
1142 REX640
Technical Manual
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