Insulation monitoring in some marine isolated electrical systems

AI Thread Summary
In marine isolated electrical systems, monitoring only one phase of insulation resistance raises concerns about undetected issues in other phases. This approach may work if the system is ungrounded or high impedance grounded, as any ground fault can disrupt balance and be detected. Typically, monitoring the neutral is more common, but phase monitoring can also be effective. Further clarification on the specific system design is needed for a comprehensive understanding. Accurate monitoring is crucial for maintaining system integrity and safety.
Junior01
Hi,
In some marine isolated electrical systems I saw that only one phase insulation resistace is monitored. Why? If something happens on other phases I will have no information about that or...?
Regards!
 
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If it's ungrounded, or more correctly high impedance grounded, a ground anyplace will upset the balance and is easily detected.

I'm more accustomed to seeing the neutral monitored, though a phase would work as well.

Here's a description of one type of ground monitor
http://apps.geindustrial.com/publib...NR=Installation and Instruction|GEI-72116|PDFand a tutorial on basics
http://apps.geindustrial.com/publib...e-Gro?TNR=White Papers|Resistance-Gro|genericFor a thorough lesson search on "IEEE GREEN BOOK" .

You need to give us a sketch of what sort of system it is you have in mind. I have no idea.
 
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