Overload capacity of Generator
Overload capacity of Generator
(OP)
Hi everyone,
I would like to know whether the overload capacity of the generator is considered while sizing the Diesel Engine Generator by the DG manufacturers in their software programs.
As per IEC standard, generator shall be capable of withstanding 1.5 times the full load current for 30 seconds.Or only 15 seconds? For Prime rated engine 10% overload capacity is considered.But for generator? .
I would like to know whether the overload capacity of the generator is considered while sizing the Diesel Engine Generator by the DG manufacturers in their software programs.
As per IEC standard, generator shall be capable of withstanding 1.5 times the full load current for 30 seconds.Or only 15 seconds? For Prime rated engine 10% overload capacity is considered.But for generator? .





RE: Overload capacity of Generator
Bill
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"Why not the best?"
Jimmy Carter
RE: Overload capacity of Generator
RE: Overload capacity of Generator
Generator sizing software considers the resulting voltage dip caused by motor starting.
The old school rule of thumb is that a reserve capacity of three times the rated motor current will provide acceptable starting performance.
The sizing software, based on voltage drop, often sizes the generator somewhat larger.
In extreme cases, a reserve of 2.5 times the rated motor current will start the motor but the voltage dip may be objectionable.
The smaller the motor starting load in relation to the base load, the lower the voltage dip will be.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Overload capacity of Generator
Selecting a generator AC to meet your requirements requires a control philosophy where the starting sequence of plant is stated along with their kilowatts. A simple addition of kilowatts may lead to short falls or over compensation.