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8 Special features
8.1 Energy registration
The ITZ can be configured for the following types of energy registration:
a) Measuring of +A with non-reverse ratchet
A
tot
= A1+A2+A3
A
tot
> 0 energy is registered
A
tot
< 0 non-reverse ratchet active, no registration of energy takes place
b) Measuring of +A and -A
+A and -A are registered in two separate registers
A
tot
= A1+A2+A3
A
tot
> 0 Import
A
tot
< 0 Export
c) IAI-absolute measurement
+A and -A are registered in the +A register. The absolute measurement takes place
phase by phase: I A
tot
I=IA1I+IA2I+IA3I
d) Measuring of +R with non-reverse ratchet
R
tot
= R1+R2+R3
R
tot
> 0 energy is registered
R
tot
< 0 non-reverse ratchet active, no registration of energy takes place
e) Measuring of +R and -R
+R and -R are registered in two separate registers
R
tot
= R1+R2+R3
R
tot
> 0 Import
R
tot
< 0 Export
f) IRI-absolute measurement
+R and -R are registered in the +R register. The absolute measurement takes place
phase by phase: I R
tot
I=IR1I+IR2I+IR3I
8.2 Registration of instantaneous values
The ITZ meter can register active power P, reactive power Q, voltage U (per phase) and
current I (per phase) and display with the following digitness (integer digits/decimal digits
[Unit]):
- U = 3.1 [V]
- I = 3.2 [A] (with direct connected meters)
I = 1.3 [A] (with transformer operated meters)
- I P I = 2.2 [kW] (with direct connected meters)
I P I = 1.3 [kW] (with transformer operated meters)
- I Q I = 2.2 [kvarh] (with direct connected meters)
I Q I = 1.3 [kvarh] (with transformer operated meters)
8.3 Measuring of the maximum demand
The ITZ has the possibility to measure the maximum demand, this occurs continuously
over a 24 hour period and is clock synchronised. With the maximum demand for active
energy 15 pre-values can be saved, for reactive energy no pre-values are formed.
The measuring period can be parameterised to 5, 6, 10, 12, 15, 20, 30 or 60 min
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