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 resistance between the two conductors drops below a set value, usually 50 kΩ (sample of IEC standard for medical applications).The main advantage[citation needed] is that the ungrounded or floating system allows a continuous operation of important consumers such as medical, chemical, military and etc. Even if there is a failure(i.e. phase touches ground) there is still no danger to the personnel and to the application.
Some manufacturers of Monitors for these systems are capable to handle VFD's (Variable Speed Drives), most are not. The problem are the DC-portions of the VFD's.
Most monitors work by injecting low level dc on the line and detecting.[citation needed] - Some manufacturers use a patented AMP-monitoring principle (Adapted Measuring Pulse)[citation needed]
External links
Additional reading
- by BENDER CANADA 2012 -Electrical Safety on Ships, Offshore and Onshore
- 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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