15
3-Wire Delta, 2½-Element, 2 PTs & 3 CTs
Use PTs for voltages over 600 V L-L
VOLTS MODE = Delta
Single Phase Connection Diagram
277 V L-N / 554 V L-L max. Use PTs for higher voltages.
VOLTS MODE = Single
Using Potential Transformers
2A
V1 V2
V3
Vref
I11
I12
I21
I22
I31
I32
N/-L/+
G
3A
A
B
C
V4
I41
I42
I51
I52
LINE
LOAD
Fuse for N/- terminal
required if its supply
source is ungrounded
Connect G terminal
to ground for AC
power source
V
1
V
2
V
3
V
ref
I
11
I
12
I
21
I
22
I
31
I
32
2A
A
B
N
N/+L/+
G
3A
PF angle
= 0.9 (25° Lag)
I
b
I
a
V
a
0°
V18
b
0°
V
4
I4 Optional
I
41
I
42
I
51
I
52
LINE
LOAD
Fuse for N/- terminal
required if its supply
source is ungrounded
Connect G terminal
to ground for AC
power source
System Mode Voltage Range Requires PTs
Wye
120 V L-N or 208 V L-L no
277 V L-N or 480 V L-L no
347 V L-N or 600 V L-L no
over 347 V L-N or 600 V L-L yes
Single Phase
120 V L-N or 240 V L-L no
277 V L-N or 554 V L-L no
over 277 V L-N or 554 V L-L yes
Delta
up to 600 V L-L no
over 600 V L-L yes
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