ABB RELION SMU615 Applications Manual page 46

Merging unit variants
SEQSPVC1_FUSEF_3PH
Figure 19: Current circuit and Fuse failure supervision functions
Three arc detection function stages ARCDSARC1...3 are included as an optional
function. The arc detection offers individual function blocks for three arc sensors
that can be connected to the merging unit. Each arc detection function monitors
the light information from an arc and delivers a signal, if an arc is detected.
The output signals from ARCDSARC1...3 are connected to the disturbance recorder
function block.
Figure 20: Arc detection function
3.3.3.4 Functional diagrams for measurement functions
The phase current inputs to the merging unit are measured by the three-
phase current measurement function CMMXU1. Similarly, the sequence current
measurement CSMSQI1 measures the sequence current and the residual current
measurement RESCMMXU1 measures the residual current.
46
Current circuit supervision
SEQSPVC1_FUSEF_U
CCSPVC1_ALARM
CCSPVC1
BLOCK FAIL
ALARM
O:15|T:2.5|I:1
Fuse failure supervision
SEQSPVC1
BLOCK FUSEF_3PH
CB_CLOSED FUSEF_U
DISCON_OPEN
MINCB_OPEN
O:16|T:2.5|I:1
Supervision alarm
OR6
B1 O
B2
B3
B4
B5
B6
O:17|T:2.5|I:1
ARC detection
ARCDSARC1
BLOCK ARC_FLT_DET
O:21|T:2.5|I:1
ARCDSARC2
BLOCK ARC_FLT_DET
O:19|T:2.5|I:2
ARCDSARC3
BLOCK ARC_FLT_DET
O:20|T:2.5|I:3
1MRS758580 C
CCSPVC1_FAIL
CCSPVC1_ALARM
SEQSPVC1_FUSEF_3PH
SEQSPVC1_FUSEF_U
SUPERVISION_ALARM
ARCDSARC1_ARC_FLT_DET
ARCDSARC2_ARC_FLT_DET
ARCDSARC3_ARC_FLT_DET
SMU615
Application Manual