11
Fig. 5.1: Three phase measurement with neutral
conductor (3ph, 4w, 1m).
Three phase auxiliary measurement
Installation
Fig. 5.3: Single phase measurement (1ph, 2w, 1m).
Fig. 5.2: Three phase measurement without neutral
conductor (3ph, 3w, 1m).
Single phase auxiliary measurement
Hilfsmessung
Netz
Messung
Anschlußvariante Abb.
L1, L2, L3, N, PE Dreiphasige Messung mit Nullleiter.
3ph, 4w, 1m
5.1
L1, L2, L3, PE
Dreiphasige Messung ohne Nullleiter.
3ph, 3w, 1m
5.2
L1, N, PE
Einphasige Messung.
1ph, 2w, 1m
5.3 /4.14
Measurement
Medium and high voltage
Potential and current transformers are always re-
quired for measurements in medium and high volt-
age distribution systems. Special safety regulations
have to be observed when using these transformers.
Measurement circuits
The UMG 510 provides two measurement inputs:
one three-phase main measurement and one auxil-
iary measurement. In total 4 voltages and 4 currents
can be measured.
The three-phase main measurement has 10 differ-
ent measurement configurations. The auxiliary input
provides 3 measurement circuits.
Use the auxiliary input to measure single-phase or
symmetrical three-phase systems.
Neutral line current measurement
Example:
Both inputs may be used in a three-phase system to
calculate the difference between the theoretical and
real neutral current (caused by earth leakage).
Fig 4.13: Three phase measurement with neutral
conductor (3ph, 4w, 3m) and measurement with
auxiliary input (1ph, 2w, 1m).
