Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


three diesel generators syncronizing with National grid problem

three diesel generators syncronizing with National grid problem

three diesel generators syncronizing with National grid problem

Dear Gents thanks for help and reply,
kindly find the updated actions and feedback
we had three caterpillar diesel generators 750 KVA (model: 3412) with electronic fuel pump (PEEC)which are synchronizing with each other and synchronize with the national grid for load sharing and load transfer through WOODWARD EGCP-2 8406-120 control panels but during the last past days we notice the following problem: -

Generator address No.2
•Without synchronizing order: The speed during test mode or running from the local panel is 1500 RPM without hunting or fluctuation.
•With synchronizing order: The speed during running mode is fluctuating between 1490 to 1510 RPM with hunting which led to the generator doesn’t synchronize with the other generators or with the national grid as a single unit.
Others: -
1- The faulty genset working random after a lot of trails and when it sync with the others generators it working without any problems until they stopped normally and if we need to but it in the service again it doesn’t sync again and it starting hunting
2- Generator address No.1 had the same problem one time or twice but still working, just we stopped and starting it again and it sync normally
3- the speed bais output already changing fast from 37% to 42% while the others generators changed between 38% to 39% and they sync normally which mean that the controller already sending a variable speed bais value

The actions which had been taken: -
1- Check and test the continuity of the MPU sensor to the ECM and speed bais signal wiring.
2- BY ET module we calibrating the RACK position Sensor which installed in the diesel fuel pump without faults
3- Swapping between two generators No 2 & 3, the Woodward control panel and still the problem in the same Genset
4- testing the insulation resistance for all generator winding and check the Block rectifier they had been found healthy
5- we checking the varistor and by the megormter and it was 15 Mega ohm at 495 Vdc
7- checking the Bus\mains signal pt on the Woodward
still the hunting problem as it is!!
may be the problem in the main bus freq signal or input
still during the sync at KW page on Woodward reference load value was 0% before running in Sync mode and it sometime be in 0% value and sometimes it give the actual reading how can i check the process signal and it can make the hunting problem or not
Does anyone know how to solve this problem?



RE: three diesel generators syncronizing with National grid problem

Have you checked the fuel control valve? It may be sticking slightly.

"Why not the best?"
Jimmy Carter

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


eBook - Mastering Tolerances for Machined Parts
When making CNC machined parts, mastering tolerances can be challenging. Are general tolerances good enough? When does it make sense to call out for tighter tolerances? Do you need a better understanding of fits, datums, or GD&T? Learn about these topics and more in Xometry's new e-book. Download Now
eBook – How to Choose the Correct Corrosion Testing Method
When designing a metal component, engineers have to consider how susceptible certain alloys are to corrosion in the final product’s operating environment. In a recent study by NACE (National Association of Corrosion Engineers), it was estimated that the direct and indirect costs of corrosion in the United States is approximately 6.2% of the GDP. In 2016, that cost exceeded $1 trillion dollars for the first time. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close