Novatech Bitronics M87X Series Manual page 123

A
B
C
N
A B C N
LINE 1
2½ Element (Wye) configured for Breaker-and-a-Half (voltage connections shown, with B-phase missing)
Current connections are the same as for 3-element 4-wire (wye) shown on the preceding page.
When configuring the unit, set the VT ratio for the missing phase equal to 0. This will cause the M872 to calculate the
voltage of the missing phase from the vector sum of the two phases present (assumes balanced voltage).
A
B
C
N
CB
A B C N
LOAD
2½ Element (Wye) configured for Dual Feeder Common Bus (shown with B-phase missing).
When configuring the unit, set the VT ratio for the missing phase equal to 0. This will cause the M872 to calculate the
voltage of the missing phase from the vector sum of the two phases present (assumes balanced voltage).
ML0021 August 15, 2018
CB CB
VOLTAGE
9
VA1
10
VB1
11
VC1
12
VN1
BUS 1 BUS 2
4
A
HI
5
B
HI
6
C
HI
1
A
LO
2
B
LO
3
C
LO
CURRENT
BUS (POTENTIALS COMMON TO BOTH FEEDERS)
VOLTAGE
9
VA1
10
VB1
11
VC1
12
VN1
BUS 1 BUS 2
4
A
HI
5
B
HI
6
C
HI
1
A
LO
2
B
LO
3
C
LO
CURRENT
Figure 9 - Signal Connections (M872)
CB
VOLTAGE
13
VA2
14
VB2
15
VC2
16
VN2
24
A
HI
25
B
HI
26
C
HI
21
A
LO
22
B
LO
23
C A B C N
LO
CURRENT
"Reference" potentials VR1
VOLTAGE
and VR2 are intended for
13
synch-check across the
VR1
respective feeder-breakers.
14
VRN1
15
VR2
16
VRN2
24
A
HI
25
B
HI
26
C
HI
21
A
LO
22
B
LO
23
C
LO
CURRENT
A B C N
107
Copyright 2018 Bitronics, LLC
LINE 2
CB
LOAD