Introduction
The ungrounded system ensures safety through continuity
of service. First insulation fault does not impact continuity of service.
However, a system outage might occur during a transformer overload
or short circuit. In such cases, the impact of short circuit can be
limited by isolating the fault. The overloads and increases in temperature
must be monitored in related to ungrounded system transformers.
The transformer monitoring function is integrated with IM15H or IM20-H. The IM10-H requires additional equipment to perform this function.
An overload or overheating might generate a transformer fault:
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On the IM15H or IM20-H, then the transformer faults take priority over an insulation fault on the display and the transformer alarm relay is activated.
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On the HRP, then the electrical fault red LED turns ON in the event of a transformer fault.
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On the Local Remote Display, the Transformer Overload or Transformer Overheat message is displayed.