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How the size of electic machine vary with the sped? Between slow and fast running machines of equal ratings, which one is more economical to design?
1 3424Why different values of B’s (magnetic flux density) are chosen for DC machines and Induction Motors?
1 3161From stability point of view,What(higher/lower) should be the value of inertia constant of rotating machines?
1 3707There are two nos of 33Kv/11Kv 5MVA transformers conecting through HT cable from substation having metering at substation itself.One transformer used at a time another remains stand by.Further 11 nos of 11Kv/440V transformers are attached on it and each transformer is having its own Power factor correction panel.Now one 33/11Kv transformer at no load condition/Stand by condition is having power factor in leading side upto 0.21 and while when another tranformer at same situation have power factor in lagging 0.42. Now one thing is clear that transformer one is having 1.5 Km long 33kv cable due to that PF goes in leading side and another is having only 250 mtr length remains him lagging. Now i want to know that how i can maintain the Power factor at no load/ stand by position though both are behaving in seperate manner.
1 6696In the ACB breaker capacity is 2000Amp but this each phase taken 1250 But total beldibg load is 600amp or 700amp watt is the problem
1920Post New Electrical Engineering Questions
Is there any rule to select the voltage of motor based on KW rating? What is the rating above which lt motor becomes the HT motor?.
How can calculate the rating of a alternator for a given specific load with formula
why normally Generator rating are between 11Kv to 22Kv?
Why need 3phase machine double earthing?
Working of microwave oven?
how to select electrical equipment such as fuse,dg,transformer,motor,msb,wire,cable as per the connecting load..please mention any books to design,take licence
A 100 kVA , 400 v/250 kv testing transformer has 8% leakage reactance and resistance on 100 KVA base . A cable has to be tested at 500 kv using the above transformer as a resonant transformer at 50 hz . if the charging current of the cable at 500 kv is 0.4 A find the series inductance required . Assume 2% resistance for the inductor to be used and the connecting leads . Neglect dielectric loss of hte cable . what will be the input voltage to the transformer ?
How time response of the system is divided?
List examples of voltage source?
what is the formula to calculate voltage drop/loss on 66KV Transmission Line?
If we use 250A MCCB as a incomer in Control panel for a fault level of 50kA for one second ,assuming temperature rise from 85 Deg. to 100 Deg , Then what will be the Aluminium Bus-bar size for 250A MCCB? Explain in detail.
what is acceptable leakage current for 33kv cable while doing high voltage test for cable? how to calaulate the leakage current for 33kv or any rated cable?
what happen if field of dc shunt motor opens? what is function of putting res. in parallel to one phase of 3 phase IM? the power supplied by 5A source in circuit is given by------Watt.
What is the type of earth fault protection used in battery? explain.
when we design electrical schemes of 11/.415kv distribution..wen and were should we show the relays??what is the function of it?for example..we place EFR Relay CT between transformer neutral link and transformer earth.Like this what are the other type of relays we should use?why?where?Explain please..Thank you
