Description
2.7 Metering function (power metering function)
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
137
Retrofitting the metering function
It is also possible to retrofit a metering function for a circuit breaker. The metering
values provided as a result have the accuracy specified by the manufacturer. This
restriction is necessary, as standard IEC 61557-12 requires routine testing for the
metering function of a circuit breaker.
The retrofit is performed in 2 steps:
1. Retrofit of internal voltage tap at the lower main conducting paths, see Chapter Retrofit
of the internal voltage tap (Page 366), or retrofit of option for connection of external
voltage transformers, see Chapter Connection of an external voltage transformer
(Page 368).
In both variants, voltage tap module VTM is added to the ETU600 electronic trip unit
and the additional metering values for voltage and active energy of the PMF-I
application package are enabled.
2. Expansion of the metering value scope by means of function packages.
The metering values of application packages PMF-II and PMF-III can be provided by
means of function packages for the metering function, see Chapter Function packages
for metering values (Page 374).
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