Three-Phase Current Unbalance Protection For Shunt Capacitor Banks Hcubptoc - ABB RELION REX640 Technical Manual

1MRS759142 C
4.12.3
4.12.3.1
4.12.3.2
4.12.3.3
4.12.3.4
REX640
Technical Manual
Three-phase current unbalance protection for shunt
capacitor banks HCUBPTOC
Identification
Function description
Three-phase current unbalance
protection for shunt capacitor banks
Function block
GUID-E7503522-65BE-4647-9221-426F153C0D41 V1 EN
Figure 556: Function block symbol
Functionality
The three-phase current unbalance protection function for shunt capacitor banks
HCUBPTOC is used to protect the H-bridge capacitor banks against internal faults.
HCUBPTOC is suitable for protection of internally fused, externally fused and fuse-
less capacitor bank applications.
HCUBPTOC has two stages of operation, the operation stage and alarm stage. In the
operation stage, HCUBPTOC starts when the measured unbalance current exceeds
the set limit. The operating time characteristics can be selected to be either definite
time (DT) or inverse definite minimum time (IDMT). In the alarm stage, the alarm
starts when the measured unbalance current exceeds the set alarm limit. The alarm
time characteristics are based on DT.
HCUBPTOC contains blocking functionality. It is possible to block the function
outputs, timers or the function itself.
Analog channel configuration
HCUBPTOC has two analog group inputs which all must be properly configured.
Table 973: Analog inputs
Input
I3P1
I3P2
Protection functions
IEC 61850 IEC 60617
identification identification
HCUBPTOC 3dI>C
Description
Three-phase currents
Three-phase unbalance currents
Section 4
ANSI/IEEE C37.2
device number
60P
1033