Solid core current
transformers typically have a long lifespan, however, they do break
down over time. When they do, it can sometimes be difficult, if not
impossible, to replace them without affecting power delivery
downstream.
When continuous power
delivery is a must, utilizing split core CTs might be ideal. Since
the rings of a split core CT can be opened up, removal and
installation of the device can be achieved without having to
disconnect the feeder lines they are meant to monitor.
It should be noted, however,
that split core CTs do have their disadvantages over solid core CTs:
First, split core CTs are
typically less accurate than solid core CTs. When accuracy is your
priority, going solid core may be your only option. When faced with
such a case, it may be best to incorporate a backup power supply in
your design so that the main feeders can be disconnected for safe
replacement of the solid core CT.
Second, split core CTs are
also more expensive than solid core CTs. Some would argue, however,
that in cases where a backup power supply is not a feasible option,
the cost of using split core CTs can be justified by the mitigated
impact to production the replacement of a CT might otherwise have.
Finally, split core CTs are
bulkier than their solid core counterparts. While this might not be a
problem in most cases, such aspect should be highly considered when
space is at a premium.
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