2-5
IM 760201-01E
Features
3
2
1
4
5
6
7
8
9
10
11
12
13
14
App
Index
Wiring Unit
The wiring unit is a set of two or three input elements of the same wiring system that
are grouped to measure three-phase power. The wiring unit is represented by
Σ
. The
measurement function of a wiring unit is called a
Σ
function.
For example, “Urms
Σ
” corresponds to the average of the voltages of the input elements
that are assigned to the wiring unit. The average represents the true rms value.
•
Wiring System and Wiring Unit Configuration Example
Voltage
input
Current
input
Three-phase,
three-wire
3
Element 1
Element 2 Element 3
Single-phase,
two-wire
Wiring system
Wiring unit
2.2 Measurement Functions and Periods
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