how capacitance is neglected in short transmission lines ?
Answer Posted / sirin dutta chowdhury
In a capacitor, there are 2 metalic plates or 2 conductive
plates and a di-electric medium in between the 2 plates.As
a result of applied voltage across the pletes,opposite
charges are induced on the plates.The capacitance increases
as the surface area of the plates increases and the width
of dielectric medium (i.e. the distance btwn the plates)
decreases.
In case of transmission line, air acts as the
dielectric medium.The metal conductor wire and the ground
act as two plates.
For short lines, length of the lines so the
surface area of the line is small.Adding to it,distance
between wire & ground is large.So net effective capacitive
effect for short line is negligible.
Is This Answer Correct ? | 47 Yes | 25 No |
Post New Answer View All Answers
State The Difference Between Generator And Alternator?
Define norton equivalent circuit?
What is Control & Relay Panel? And Remote Control Center?
in the case of 6.6kv motor starter combination contain fuses on it VCB. but in 11KV motor starter combination Fuses are not using in it's VCB why?
it is possible to rotate the DG engine dc starter with wrong polarity connections? why?
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
What is the need of generator relay panel
HOW WE CHOOSE EARTH'S POTENTIAL AS ZERO V?
how to changeover ups in this power failur time?
there is an alternator 480 k.w, 400v,50hz, 4-wire running on load having leakage alternator body earthed current 38 A. is it within acceptable limit? if yes then give reference if no then how to bring within specified limit
Why we used 690V in ACS 800 drives.Why dont use standard voltage like 415v or 1.1Kv
1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?
In cable sizing calculation (determining the max route length of cable) why we choose the shortest length between cable length of full load current Iflc & starting current Istart?
What is gross error?
Give the expression for the frequency of oscillations in an op-amp sine wave oscillator?