
Manual 37139C
UMT 1 - Measuring Transducer
Page 38/62
© Woodward
Appendix A.
Measuring Systems
CAUTION
The grounding of the N-wire in the voltage measurement must not be done at the UMT 1, but must be
done at a central location (PEN-System).
Measuring System 1W
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
Single-phase mains
•
Voltage measurement in L1 (P = V
L1N
× I
L1
× cos
ϕ
)
•
Current measurement in L1
•
Grounding of the transformer terminal pointing into the direction of the generator
L..
s1 (k)
s2 (l)
L1
N
L1
s1 (k)
s2 (l)
..
..
s1
S1
s2
S2
G
Measuring system: 1W
Measuring
current
Measuring
voltage
Detail:
Connection of
the current transformers.
G
L1
L2
L3
N
Figure 7-1: 1W measuring system