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Rockman, on that statement of inrush current being reduced, it will depend on the operating philosophy of your standby substation, if its automatic, that means all the paralleling breakers of the gens must be kept open, they will only be closed once the unit is up to speed and ate least at 90%...

If your transformers are identical or at least close to identical, then I don't see a problem, which breakers you are keeping close and which ones are controlled, especially the transformer feeder breakers? you have to consider inrush currents, the first genset that comes online may be affected...

The genset controller which in some controllers has a built in AVR and ECM, have almost all the standard codes protection, like 50/51, 50N/51N, and 32P, 25 etc protections, in that case that is the one protecting the gensets for any faults before the breaker, it will either shut off the...

As everyone has stated, according to my experience a gas genset is about 1.5 times more expensive than a diesel genset, on deciding which one to choose, you must also consider that you can have a diesel engine running and take load in 10 to 15 seconds, for a gas you must be prepared to be in the...

Thanks waross, I have a challenge with my master controller, when I got to site I found out that I cant control most of the breakers, breaker #9 WILL ALWAYS BE CLOSED, and breakers 5000A, #7 and #8 WILL ALWAYS BE CLOSED ASWELL, I am not worried about the initial plant load if I have to do a...

Hi crshears, thanks for your time, The relocated incomer 1 cable connection is the grid connection, new breaker number 9 is going to a distribution board for all the plant loads

Hi all, since I am keeping the 4 breakers closed, should I be worried about the inrush currents from energizing two transformers? because this means that the first gensets to close to the Bus will energize both transformers before the other two gensets close their breakers. By the way, thanks...

Thanks a lot, much appreciated, Each genset has a maximum fault level of 20KA, the 5000A n/c breakers to feed the transformers are rated at 100KA at 1 sec, if I keep this breakers N/C it means the 400V bus bar will always be Live and will be subjected to the full fault level of the utility...

Thanks NKN5, Unfortunately the project is in the commissioning stage now, I don't like the design as well, but I must make it work, I was involved later on this project. in my designs I make sure I avoid such, if I don't use a 11KV alternator I use a step up transformer for each genset and sync...

Hi, I need some advise please, please see the attached SLD I have three standby gensets running in parallel, 400V, from the 400V bus bar to the two transformers, I am going to keep the breakers at a normally close position. I don't expect any problem in terms of voltages as my transformers are...

Thanks Waross and Parchie, much appreciated, I will get the copy of IEEE Std 142.

Good day, I need help, with sizing the NER to limit the fault current, there are a couple of things I am not sure of. 1. selecting the current that will flow through the NER, I understand is the most critical stage, since after that you will be able to use ohms law and calculate the resistor...