Interested to Buy Any Domain ? << Click Here >> for more details...
In power generator sets, when they are coverted from 50hz
to 60hz, the kva rating after conversion increases. For
example, the manufacturer of a perkins 200kva @ 50Hz
generator set has mentioned it to become 220kva after
converstion to 60hz. What is the relation between the
frequency & the KVA rating. Any formula please.
- 3 Answers
- 7367 Views
- I also Faced
- E-Mail Answers
Answer Posted / kj
The main reason for the increase in the kva is that the
diesel engine produces more HP at 1800 rpm than at 1500 rpm.
This allows a higher kw output. The alternator can also
handle the higher current and therefore the kva is
increased. Note that the rated power factor stays the same.
This is because the amount of cooling air is increased at
the higher speed.
The increase in the EMF per turn allows a higher voltage to
be generated but this is reduced by the AVR reducing the
excitation. This has no effect on the kva capacity of the
generator set.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
ASTM D 3455 - Standard Test Methods for Compatibility of Construction Material with Electrical Insulating Oil of Petroleum Origin has been used for Testing Transformer Oils with a product placed in it. Aged Control Oil has a Power Factor of 0.032% at 100°C. Aged Oil with a Test component has a Power Factor of 0.093% at 100°. Is this increase acceptable? If not why? How much increase is acceptable?
In our plant we have installed new MCC with ELR and CBCT which is detecting some leakage current in the system but it leading to some confusion when to check that in which feeder which is drawing current we put off the whole panel itself but still CBCT detecting some leakage current so can anybody ans me , where i am going wrong or how to detect whether its actual leakage or CBCT malfunctioning.
PLZ EXPLIN ABOUT CLASS PS CLASS CT .WHY THEY R DESINED AND FOR WHAT PURPOSE?WHY OTHER CT CANT BE USED AS PS CLASS CT? EXPLAIN IN SIMPLE LAUNGAGE IF POSSIBLE PLZ GIVE CIRCIT DIAGRAM?EMAIL-RAJ_SINGH_0376@SIFY.COM
HOW TO WORK A VFD?SAY SIMPLE METHOD
Give atleast 20 alternating current apparatus and devices.
Why use the vcb at high transmission system ? Why can’t use acb?
i want to run 11kv star connected motor in 6.6kv with delta connected throught inverter, is it possible?
what is lumped and distributed elements?
What is the magnetic field (coil DC ) of Turbo Expander?
how braking & making capacity of circuit breaker are calculated?
The power supplied to a 50mH inductor from a 120V, 60Hz source will be
can i connect the two phases of scott connected transformer,if not why?
how electical engineer is related to apsrtc (general) post? if they ask a question in interview as why did u choose this job what shd be answer
i am completed diploma in ece,and working in ht and lt lines.so is elligible diploma in ece for get electrical C Licence?plse give ur opinion?
what is basic difference betmeen normal & flame proof motor??
