High Voltage Alarm Show After Synchronizing Two Generators

Please advise what should I check?

The phone number for Hyundai

Please check your avr... during parallel running please check power factor both generator

thanks for help visa. i will do that.

It seems that the 2 gensets are unable to synchronise or to remain so which might indicate governor or AVR problems.

Your synchronisation panel isn't doing its job if it allows the 2 gensets to couple in a non synchronised condition.

Were you able to determine what caused the AE1 stator to release its smoke in the first instance?

Is each AE capable of supporting the full load independently?

Is the rotation correct for each AE?

You need to determine what's going on with your synchro before you even try rewinding AE2 or putting it back into service.

Your protection systems aren't protecting very well are they? Something is not right. Is there a logbook for this setup? Look for words like "bypassed", "temporary repair", "removed", "replaced".... How long has this system been in service and where?

I don't have time to look up the specs on the Hundai generator, but from the voltages, I'm guessing it is a three phase alternator. You just had the stator rewound. There are two ways of rewinding a stator, Delta and Y (Star) wound.

Delta connections generate more power and are more efficient at high RPM's but have a higher cut-in speed, while generators wired in a Star configuration will have lower cut-in speeds with a higher voltage but generate less power at higher RPM's.

Sounds to me like the stator was wired in a different configuration than your #2. If that was the case, you can never get them to sync. Check the open or no load voltages of each output from common to output and then from each output to the other outputs. If they are not the same on both alternators, then you may have to get one of them re-wound to match.

Hope this helps.

I guessing these is ship power generator and normally onboard generator using star winding and ungrounded...

How is #10 off topic?

OP, you are at a point where you know that something is broken but you don't know what.

The course of action in this situation is to start checking what is working.

You listed a couple of things that you suspect might be wrong. Start checking them.

What is the present situation with your plant? AE 1and 2 definitely toasted, AE1 toasted and 2 suspect, Both OK separately but not happy together....or something else. You really need to define the fault. The fault you see may not be the actual fault but the result of others. Don't mix up faults and symptoms.

What is your level of experience? Are you alone(besides the guy with the battery)?

What type of alternator is this?

Ok back to our topic, now your problem is unable to sync ae1 and ae2... basic to sync generator is.. 1. Same voltage 2. Same frequency (or incoming little bit higher) 3. Same phase Have you check all theses....