Woodward SEG HighPROTEC MRA4, Device Manual

Page: 58 / 510

Connection Examples Voltage and Current Transformers
Page 58 EN MRA4 04/09
1
X4.
2
3
4
5
6
7
8
L1 L3 L2
VL1
VL3
VL2
L1
L3
N
VL3' VL2'
V13'
V32'
V21'
VL1'
n
VE'
e
L1
L3
L2
L1 L3 L2
1
X3.
2
3
4
5
6
7
8
9
10
11
12
IG'
Three phase current measurement; In secondary = 1 A.
Earth-current measuring via Holmgreen-connection; IGnom secondary = 1 A.
Three-phase voltage measurement - wiring of the measurement inputs: "star-connection"
Measurement of the residual voltage VE via auxilliary windings (e-n) "open delta"
Connection example Anti-Clockwise Rotating Field
IL1
1A
5A
N
IL3
1A
5A
N
IL2
1A
5A
N
IG
1A
5A
N
VE
VL3/
VL31
VL2/
VL23
VL1/
VL12
Notice!
Notice!
Not recommended for isolated and compensated networks
Measuring of VE and IG is possible
IL1 IL3 IL2
L2
IL3'
IL2'
IL1'
IL3'
IL2'
IL1'