Insulation monitoring device

An insulation monitoring device monitors the ungrounded system between an active phase conductor and earth. It is intended to give an alert (light and sound) or disconnect the power supply when the resistance between the two conductors drops below a set value, usually 50 kΩ (sample of IEC standard for medical applications). The main advantage is that the ungrounded or floating system allows a continuous operation of important consumers such as medical, chemical, military, etc.

Some manufacturers of monitors for these systems are capable of handling VFDs (Variable Frequency (Speed) Drives). Most, however are not due to issues with the DC-portions of the VFDs.

Most monitors work by injecting low level DC on the line and detecting. Some manufacturers use a patented AMP-monitoring principle (Adapted Measuring Pulse)

Further reading


gollark: Oh, cool unrelated thing, my double-fusion system in a compact machine, recently upgraded to 3.
gollark: Think about it! If your reactor is *designed* to constantly meltdown, you won't have to worry when it happens!
gollark: <@404656680496791554> even mekanism fusion reactors?
gollark: (not as a mod feature, I mean as in constructing self-repairing constant-meltdown things with the current version)
gollark: Cool and utterly terrible idea: reactor designs which constantly melt down and have self-repair capability.
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