Re: VMM (voltage monitoring module)

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#12257
Spir Georges GHALI
Participant

Dear ;

 

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.