Insulation monitoring device
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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 impedance between the two conductors drops below a set value, usually 50 kΩ.The main advantage of the device that it allows uninterprted power supply on important consumers such as medical,military and etc. Even if there is a failure(i.e phase touches ground) there are still no danger to the personal.
It works by injecting low level ac or dc on the line and detecting.
External links
Additional reading
- Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 8: Insulation monitoring devices for IT systems
- The IT earthing system (unearthed neutral) in LV
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