why we use 25 kv in railway .not 11kv, or 33 kv
Answers were Sorted based on User's Feedback
Answer / pravin borkar
The choice of 25 kV was related to the efficiency of power transmission as a function of voltage and cost, not based on a neat and tidy ratio of the supply voltage. For a given power level, a higher voltage allows for a lower current and usually better efficiency at the greater cost for high-voltage equipment. It was found that 25 kV was an optimal point, where a higher voltage would still improve efficiency but not by a significant amount in relation to the higher costs incurred by the need for greater clearance and larger insulators.
Is This Answer Correct ? | 2 Yes | 2 No |
Answer / senthil nathan
as per load requirement(TRACTION MOTOR, DC SERIES WOUND
MOTOR 782V, 250AMPS) They have selected this 25kv. because
using transformer power can not be varied voltage or
current may vary but power remains same.
Is This Answer Correct ? | 9 Yes | 11 No |
Can we generate 3 phase power from single phase connections?? If yes, how?
Shall I use 40A semiconductor Fuses in 32 A SFU ? Frame size is same. What Happen if Fuses burn on SFU?
What fomula is used to calculate: 1. rated frequency withstand voltage, and 2. rated lightning impulse withstand voltage.
plz send me the syllabus or any sample paper for engineer trainee recruitment if any,on ravinder911@yahoo.com
0 Answers Bhel, Maruti Suzuki,
how induction generator generated the power without excition like syncronous generator.
what is a FACTS devices? what is mean by STATCOM????
I need to calculate the Battery bank back up for below configuration:- UPS - 120 KVA Battery Bank - 200Ah Volt of each cell - 12 V Total No of cell - 34 No's Can you please help me to get the battery back up time for above configuration...? along with formula
How to take the Vector Group Test in Transformer? What is the purpose of doing Vector Group Test?
How I can Compare 120v/60Hz versus 220v/50Hz ? Please tell me both advantage and disadvantage ......
What do you mean by turns ratio of instrument transformer?
why transformer ratings are in kva
What are the advantages and disadvantages of closed-loop control system?