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D-92
Installation of the current
transformer
Additional informations
The current transformers can be installed either on the main busbars or on the
circuits upstream or downstream of devices.
Installation must not affect the insulation level or the reliability of the busbars.
PD391279
Choice of a CT model depends on the type of installation:
insulated cables
Prisma Plus vertical busbars
insulated flexible busbars
Linergy vertical busbars
rigid busbars.
When installing a CT, we recommend that you comply with the following mounting
rules:
install current transformers:
on an easily dismountable busbars or copper connections
between 2 connection points, by joints or bolted connection
place the current transformer so that the identification markings remain readable.
For large current transformers, a staggered installation is recommended to prevent
arcing on fixing screws or excessive spacing between phase conductors.
If they are installed on vertical busbars, secure the current transformers in place to
prevent them from slipping downwards (for example using a bolt or a pin)
when there are several busbars per phase, fit spacers between the busbars in
order to:
resist the tightening forces when installing the current transformer
avoid v brations that lead to current transformer breakdowns.
b
b
b
b
b
b
v
v
b
b
v
v
Dismountable vertical busbars.
PD391280
PD391281
CT on vertical busbars.
Spacers between the bars.
Practical information