Parallel Connection of MOV

[mayavi207]

mov parallel connection

Could anybody explain still clear about the Clamping & Varistor voltage difference

AND

When the MOVs are connected the total joule rating is the sum of the joule rating of the individual MOV. How about the Clamping Voltage? & Varistor Voltage?

How to calculate the life span of the MOV?

 

[dipnirvana]

Varistor voltage : Voltage across varistor when current is 1mA , i.e safe working voltage of varistor

Clamping Voltage: When conduction starts , some time max calmp voltage is also specified in the datasheet.

For life span , u need to calculate the current in case of the transient and look for the possible strike in the life span and age will come from the datasheet

 

[mayavi207]

Thanks For your Reply!

When the MOVs are connected in parallel the total joule rating is the sum of the joule rating of the individual MOV. How about the Clamping Voltage? & Varistor Voltage?

Could you plz explain this[/i]

 

[yetisouth]

MOV's should not be connected in parallel, because of the very steep curve when they start conducting. If they have only a slight difference in threshold voltage, only one will do all the work, and the other will rest - just like a politician. Typical tolerances are about 30%, so they definitely will not share!