Genset Soft-Loading
Genset Soft-Loading
(OP)
Hello, I want to ask you about a system in which there are three transformers and 3 gensets all have the same KVA respectively, I mean the back-up gensets are rated the same KVA with the tranformer to which they belong, Of course xformer-genset groups have different power ratings from each other in this case.Three gensets feed the same synchronisation busbar and the output of this busbar feeds the load busbars which is being fed by xformers separately, a classical system except that the xformers feed their loads separately and have no tie-breaks to connect them . I wonder if it is possible to have a soft-loading scheme here if the xformers have the same output voltages so that they can be paralleled (if they are fed from the same source and xformers have the same characteristics such as X/R ratio, connection type, etc) and they have separete busbars . I think it is impossible to have a soft-loading with a case in which xformers couldnt be paralleled, I mean paralleling of xformers is a stipulation to have this system soft-loading but I am not sure if the xformers busbars are separate.






RE: Genset Soft-Loading
Rafiq Bulsara
http://www.srengineersct.com
RE: Genset Soft-Loading
RE: Genset Soft-Loading
Rafiq Bulsara
http://www.srengineersct.com
RE: Genset Soft-Loading
Rafiq Bulsara
http://www.srengineersct.com
RE: Genset Soft-Loading
RE: Genset Soft-Loading
Rafiq Bulsara
http://www.srengineersct.com
RE: Genset Soft-Loading
Normally, when a generator is paralleled with the grid, the generator will be running at no load with the throttle almost closed. The frequency is set slightly above grid frequency. When the generator output is passing through the synchronizing zone, the breaker is closed and the generator picks up a small portion of the load, just enough to maintain stability. The throttle is then opened (by advancing the governor setting or by a generator control panel) until the generator is delivering the desired output.
In your case, you are going in the other direction. The generator is already loaded, you may sync at a slightly higher frequency and export some energy or at a slightly lower frequency and drop a little load on the grid. Your protection scheme may dictate this choice. Once you are connected with the grid, the throttle may be opened or closed to either export power or transfer the load to the grid.
The choice of doing this as a group or each generator independently may be dependent on the synchronizing and control equipment that is installed.
A good operator may transfer as a group or independently manually. The possibility of an automatic transfer either way, group or independently, may depend on the available features of your Automatic Transfer Switch (ATS) and/or your generator control panel.
Bill
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