ZES ZIMMER LMG450, Руководство пользователя

Страница: 90 / 306

Normal measuring mode LMG450
90
5.3.3 Total values
This are values which are calculated over several channels of one group. Following symbols
are used:
f first channel of the group
l last channel of the group
s number of the display channel for the total values
These three symbols depend on the wiring. Please refer to 2.4, ‘The group concept’ and 2.5,
‘Linked values’ for details
Following values are calculated for the total values display channels (all other values are
invalid):
collective sum voltage: U U
s
n f
l
TRMS nTRMS
=
=
∑
2
collective sum current: I I
s n
n f
l
TRMS TRMS
=
=
∑
2
active power: P P
s n
n f
l
=
=
∑
apparent power: S U I
s s s
=
*
reactive power:
Q S P
s s s
= −
2 2
power factor:
λ
s
s
s
P
S
=
frequency: f f
s f
=
active energy:
∑
=
=
N
n
n s s
T P EP
0
reactive energy:
∑
=
=
N
n
n s s
T Q EQ
0
apparent energy:
∑
=
=
N
n
n s s
T S ES
0
average active power:
∑
=
=
N
n
n
s
s
T
EP
Pm
0