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4
Installation and De-Installation
4.1
Basic Information for Connecting Meter
4.1.1
Connection to Low Voltage with Current Transformers
Test terminal block
© Landis+Gyr AG
This chapter describes the installation and connection of meters for trans-
former connection. In addition, the necessary steps for checking the con-
nections, commissioning of the meter and the final functional check are
described as well as the de-installation.
Dangerous voltage
Dangers can arise from live electrical installations to which the meters are
connected. Touching live parts is dangerous to life. All safety information
should therefore be strictly observed without fail.
It is recommended to use the following circuits whenever possible for con-
necting the meter to the various voltage levels.
Terminal layout
In the following illustrations the terminal layout is shown according to DIN.
For the version with symmetrical terminal layout, which is optionally avail-
able for ZMD400 meters for three-phase four-wire networks, the different
terminal numbers according to the connection diagram must be observed.
Fig. 4.1
Connection to low voltage with current transformers
The secondary circuit of a current transformer must always be closed when
current is flowing in the primary. Opening of the secondary circuit can de-
stroy the transformer. The test terminal block shown in Fig. 4.1 allows the
secondary circuits to be short-circuited and the voltage circuits to be
opened in order to exchange the meter without interrupting operation.
D000030110 d – E650 Series 3 (ZMD400AT/CT, ZFD400AT/CT) – User Manual
Installation and De-Installation
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