Home › Electrical Engineering Forum › General Discussion › VMM (voltage monitoring module)
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Spir Georges GHALI.
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2011/06/04 at 7:20 pm #10499
ikram shehzad
ParticipantHello all,
i want to ask a question to all of you that what is VMM (voltage monitoring module )? how it work,s? i heard somewhere that it compare 1 phase voltage to other phase voltage. but there is also some setting on it. how to set it,s setting. please tell me briefly.Thank,s and Regard,s.Muhammed Ikram.2011/07/01 at 1:33 pm #12249NotUrOrdinaryJoe
ParticipantThis device is a special relay that will signal or disconnect a more expensive circuit if it detects a problem with the voltage feed. Some of them will monitor three phase voltage for dips or overshoot (variations greater than 10% of nominal typically). It may also monitor loss of a phase or phase reversal. It is a level of protection above that of a fuse or circuit breaker.
2011/07/02 at 9:49 am #12257Spir Georges GHALI
ParticipantDear ;
The VMM ikram shehzad said:
Hello all,
i want to ask a question to all of you that what is VMM (voltage monitoring module )? how it work,s? i heard somewhere that it compare 1 phase voltage to other phase voltage. but there is also some setting on it. how to set it,s setting. please tell me briefly.Thank,s and Regard,s.Muhammed Ikram.
Dear ;
the ” VMM ” are ” Electronic Relays ” with 1 or more of auxiliary contacts , and have many functions that are :
– ” Monitor & Compare ” each voltage phase's value with a ” References values ” for ” Up & Down “, and when the difference exceeds a ” References levels ” also for ” Up & Down “, the auxiliary contacts will change their states from ” NO to NC ” or ” NC to NO “.
– ” Monitor & Compare ” the rotation of phases with a ” Reference Rotation “, and when aren't the same, the auxiliary contacts will change their states from ” NO to NC ” or ” NC or NO “.
About the settings, there are many kinds, but normally :
– A special setting for ” Up level ” of voltage given in ” % ” of the designing value.
– A speical setting for ” Down level ” of voltage given in ” % ” of the designing value.
– In some VMM there's also a ” Timing delay ” in seconds.
In some ” VMM ” the references values are fixe by ” 10 – 15% “, so, there's no need to do any setting.
Regards.
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