Function Block - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.12.1.2
4.12.1.3
4.12.1.4
1010

Function block

GUID-4360928E-C2D8-4978-AB08-E02D3B77E243 V1 EN
Figure 546: Function block
Functionality
The three-phase overload protection for shunt capacitor banks function COLPTOC
provides single-phase, two-phase and three-phase protection against overloads
caused by harmonic currents and overvoltages in shunt capacitor banks. The operation
of overload and alarm is based on the peak value of the integrated current which is
proportional to the voltage across the capacitor.
The overload function operates with IDMT characteristic and an alarm function
operates with DT characteristic.
COLPTOC provides undercurrent protection to detect disconnection of the capacitor.
COLPTOC has breaker reclosing inhibit feature to enable complete capacitor
discharging before breaker reclosing after it has operated.
COLPTOC contains blocking functionality. It is possible to block the function
outputs, timers or the function itself.
Analog channel configuration
COLPTOC has one analog group input which must be properly configured.
Table 950: Analog inputs
Input
I3P
See the preprocessing function blocks in this document for the
possible signal sources.
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings. For
troubleshooting, check the contents of this chapter and also the preprocessing blocks
in this document. The configuration can be written to the protection relay once the
mismatch is corrected.
Description
Three-phase currents
1MRS759142 C
REX640
Technical Manual