
Manual 37139C
UMT 1 - Measuring Transducer
Page 40/62
© Woodward
Measuring System 2W3
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Three-phase mains
•
3-wire (delta) system
•
Asymmetrical (unbalanced) load
•
Voltage measurement in L1, L2 and L3
•
Current measurement in L1 and L3 (open delta connection)
•
Grounding of the neutral point (connected transformer terminals)
L..
s1 (k)
s2 (l)
L1
s1 (k)
s2 (l)
L3
L3
L2
L1
s1 (k)
s2 (l)
..
..
s1
S1
s2
S2
G
L..
s1 (k)
s2 (l)
L2
L1
L2
L3
Measuring
current
Measuring
voltage
Measuring system: 2W3
Detail:
Connection of
the current transformers.
N
G
Figure 7-4: 2W3 measuring system
Measuring System 2W4
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Three-phase mains
•
4-wire (wye) system
•
Asymmetrical (unbalanced) load
•
Voltage measurement in L1, L2 and L3
•
Current measurement in L1, L2 and L3
•
Grounding of the transformer terminal pointing into the direction of the generator
L1
L2
L3
N
S1
S2
L..
G
N
L3
L2
L1
s1 (k)
s2 (l)
s1 (k)
s2 (l)
L1
L2
s1 (k)
s2 (l)
L3
Detail:
Connection of
the current transformers.
Measuring system: 2W4
Measuring
current
Measuring
voltage
s1 (k)
s2 (l)
s1
s2
..
..
G
Figure 7-5: 2W4 measuring system