ZES ZIMMER LMG450, User Manual

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Z E S ZIMMER Electronic Systems GmbH Chapter 5
89
Impedances
apparent impedance:
Z
Utrms
Itrms
=
active impedance:
Rser
P
Itrms
=
2
reactive impedance
Xser
Q
Itrms
=
2
5.3.2 Integrated values
The following basic definitions are used:
n
The value from the measuring cycle number n.
N Is the number of measuring cycles for the integration. This number depends on the real
measuring times and on the desired integration time.
Energy
active energy:
EP P T
n n
n
N
=
=
∑
*
0
reactive energy:
EQ Q T
n n
n
N
=
=
∑
*
0
apparent energy
ES S T
n n
n
N
=
=
∑
*
0
Average values
average active power:
Pm
EP
T
n
n
N
=
=
∑
0
average reactive power:
Qm
EQ
T
n
n
N
=
=
∑
0
average apparent power
Sm
ES
T
n
n
N
=
=
∑
0
Miscellaneous
charge:
q Idc T
n n
n
N
=
=
∑
*
0
integration time:
t T
n
n
N
=
=
∑
0