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Re: CAT DG's (3512B)- Maximum allowable transient loading

Would you please suggest the solution/ recommendation for transient load withstanding capacity for a duration of maximun 30 Sec in CAT 3512B model DG (1360KVA).


What are all the ways and means to acheive/ enhance the short term rating of 1360KVA for 30 sec to cater the load of 2 nos 500kW motors with soft start setting of 3.5 times full load current as starting current for the period max of 30 sec at 415V/ 50Hz. by starting one after the another.

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Re: CAT DG's (3512B)- Maximum allowable transient loading

Can anyone please guide.

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CAT DG's (3512B)- Maximum allowable transient loading

Dear Sir,


Myself, R. Pradeep kumar (Electrical Er) working in M/s. Larsen & Toubro ltd, Doha- Qatar.


For our Doha South STP project, we have purchased 2 New CAT DG's (3512B). Details of Alternator/ Engine/ CT ratio/ Breaker at DG alternator end are enclosed herewith, kindly clarify us what is the maximum transient current/ load can be applied for more than 30 sec.


Alternatively, we would like to connect a load of 500KW (2 no’s- one after other) using a soft starter (Schnieder - ATS48M12Q) with the pre- set value of 350% limiting current for 20Sec acceleration ramp time with initial starting torque of 20%..


Please note we successfully carried out load test at 110% using a load bank.



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