ABB RELION 615 Series Applications Manual page 50

Section 3
REV615 standard configurations
44
X110_BI4_CB_CLOSED
GUID-CF723E8E-F01F-4A51-BE58-2083B45AC03F V1 EN
Figure 19: Capacitor bank overload protection function
Current unbalance protection for shunt capacitor banks CUBPTOC1 is provided in the
application configuration to protect double-Y type connected capacitor banks against
internal faults. The function is suitable for protection of internally fused, externally
fused and fuse-less capacitor bank applications. If the application contains an H-
bridge type capacitor bank, CUBPTOC1 function can be replaced by HCUBPTOC
function which has been designed for H-bridge type capacitor banks.
BLOCK
GUID-E065DA6C-6BA6-4373-B7D4-3F7A65C73BDD V1 EN
Figure 20: Unbalance protection for H-bridge shunt capacitor banks
Shunt capacitor bank switching resonance protection, current based, SRCPTOC1 is
used for three-phase resonance detection caused by capacitor switching or due to
topology changes in the network.
BLOCK
RESO_IN
GUID-00CB236D-D5DF-47C7-B0D4-1542CA5340B7 V1 EN
Figure 21: Capacitor bank resonance protection
Two overvoltage and undervoltage protection stages PHPTOV and PHPTUV offer
protection against abnormal phase voltage conditions. Positive-sequence
undervoltage protection PSPTUV1 and negative-sequence overvoltage protection
NSPTOV1 functions enable voltage-based unbalance protection. A failure in the
voltage measuring circuit is detected by the fuse failure function and the activation is
connected to block undervoltage protection functions and voltage based unbalance
protection functions to avoid faulty tripping.
COLPTOC1
BLOCK OPR_OVLOD
CB_CLOSED OPR_UN_I
ST_OVLOD
ST_UN_I
ALARM
BLK_CLOSE
CUBPTOC1
OPERATE
START
ALARM
SRCPTOC1
ALARM
OPERATE
1MRS758955 A
COLPTOC1_OPR_OVLOD
COLPTOC1_OPR_UN_I
COLPTOC1_ST_OVLOD
COLPTOC1_ST_UN_I
COLPTOC1_ALARM
COLPTOC1_BLK_CLOSE
CUBPTOC1_OPERATE
CUBPTOC1_START
SRCPTOC1_ALARM
SRCPTOC1_OPERATE
Application Manual
REV615