Woodward SEG HighPROTEC MRA4, Device Manual

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Connection Examples Voltage and Current Transformers
Connection Examples Voltage and Current Transformers
Page 56 EN MRA4 04/09
1
X4.
2
3
4
5
6
7
8
L1 L2 L3
V12
V23
V31
VL1
VL2
VL3
L1
L2
N
VL2' VL3'
V12'
V23'
V31'
VL1'
n
VE'
e
L1
L2
L3
L1 L2 L3
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"
IL1
1A
5A
N
IL2
1A
5A
N
IL3
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 IL2 IL3
L3
Connection example Clockwise Rotating Field
IL2'
IL3'
IL1'
IL2'
IL3'
IL1'