Generators on Synchro Board

Not everything on the Internet is true, in particular that item.

ok.. so?

Rubbish!

sorry, if I get your question correctly.if are talking about parallellin of generator wit unmatched parameters.reasons being dat if their parameters do not match before synchronization of d generators it will cause a serious system disturbance n possibly an explosion. so in other to successfully parallel two generators to ork in synchronism, their voltage magnitudes must be the same, viotage frequencies and their phase angle must match for safe paralling

I have seen locations where Generators of different ratings were functioning in parallel through synchronization panels.Such panels are designed in a manner that said Generators cannot be in synchronization without achieving certain conditions.

It could get interesting if it wasn't possible to parallel generators of different rating. Take the UK for instance. We would have to shut down the national grid because according to the OP it just wouldn't work.

It's not exactly at it's best, but it still keeps working with few outages.

I know that this is wrong information on internet..

I have done synchronising of two dissimilar rating generators, almost 10 + sites.

We need to take care about the Load Sharing between these two generators, Rule says that the Generators in Sync should be loaded to equal % of their capacity.

To sync two dissimilar rating generators (of Different Manufacturer) is typically difficult than to similar rating generators (Same Manufacturer). The winding pitch plays very important role, to achieve the 4th Sync Condition that the generators should be of Same Phase Angle..

Now a days all manufacturers are using 2/3rd Winding pitch, so the risk due to disimilar phase angle has vanished..which has further eased this sync of dissmilar generators..

Regards,

Vishram LELE

Hi

I agree with all the above comments regarding disimilar generators. I dont understand the pitch comment. All the pitch does is cancle out some harmonics. Typically 83% would be used on high voltage machines and 66% on low voltage (66% reduces the third harmonic and allows L-N connections. But the synchronise just sees the resultant three voltages. AM I missing something?

I suppose you are ignoring the 4th Condition / Prerequist for Synchronising " The Phase Agnle of Both the Alternators Should be Same".

This necessarily means that the Angular difference between the Instatanous Voltages should be zero, this is possible only if the Coils distribution in the Main Stator of the Alternator is exactly same and Hence the Pitch Factor.

Ofcourse this is my understanding about the 4The Condition / Prerequisit of Synchronising.

Regards,

Vishram LELE

My understanding of the phase angle being the same, relates to the external phase angle of the two generator waveforms, not the internal phase angle. My experience is that the pitch factor makes no difference.