use of null meter in synchronisation

[probe01]

can some body tell me what is use of null meter in synchronisation and what it ment for?

 

[rbulsara]

Look up "Synchroscope" on Google or Wikipedia.

Rafiq Bulsara

http://www.srengineersct.com

 

[probe01]

well i had tried but synchroscope and null meter is different

 

[rbulsara]

Not familiar with that term/meter in synchronizing application. A null meter that is used for resistance testing has no direct use there. Describe the null meter your know about.


Rafiq Bulsara

http://www.srengineersct.com

 

[dpc]

Perhaps something related to voltage matching of generator voltage and line voltage, but I've never come across this terminology in a synchronizing system.

David Castor

http://www.cvoes.com

 

[byrdj]

would it be similair to using lamps to indicate when the incoming and generator are inphase

 

[GTstartup]

My understanding of a null meter is that it is used to indicate the balance between an AVR auto and field current channel, not directly related to synchronizing

 

[waross]

I thought that a null meter was used to synchronize aircraft engines or boat engines to eliminate the beat frequency of small speed differences.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[ScottyUK]

I agree with GTstartup, it is a term sometimes seen when multiple controllers are tracking each other in an AVR, typically the main and standby auto systems and the manual controller. It's purpose is to aid a bumpless transfer between sources, i.e. if the null meter isn't zero there will be a definite 'bump'.


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If we learn from our mistakes I'm getting a great education!

 

[pwrengrds]

The null meters I have seen are used to switch modes of operation in the AVR, from Auto to Manual, Manual to Auto.

Its generally not used to sync.

David