what are the advantages of having high voltage in transmission
lines?
- 5 Answers
- 6623 Views
- I also Faced
- E-Mail Answers
Answer Posted / srajan
AC is used for both transmission and distribution because it is possible to easily transform voltage. Increasing voltage reduces current, thereby reducing the size conductors required to transmit large blocks of power, and also minimizes losses. Lower voltages are desired at the point of consumption because of safety and convenience.
With DC, the advantages of higher voltage (smaller conductors, lower losses) and lower voltages (safety and convenience) are also present, but there is no convenient way to change the voltage with DC. That's the main reason that all-DC systems are not used.
DC does offer two advantages over AC - with AC, the maximum distance that power can be transmitted is limited by two factors. Obviously, one is losses. But a more limiting factor is that the maximum magnitude of power transfer is governed by the phasor angle between the sending and receiving voltages - that angle physically cannot exceed 90 degrees, and as a practical matter can not be allowed to exceed about 30 degrees without jeopardizing the ability to the system to respond to contingencies. With DC, there is no angular limitation, only a limitation based on losses.
That angular concern comes about because of the need to maintain synchronism across an AC system. The second advantage of DC is that there is no need to maintain synchronism, and in fact DC can readily be used to interconnect systems that are not in synchronism (for example, the State of Texas is not in synchronism with anyone else - and that goes beyond politics - and is interconnected with the rest of North America via high voltage DC. It is also possible to interconnect systems that are operating at different frequencies using DC - for example, the Amtrak rail system between Washington DC and New York is a 25 Hz system, and is interconnected to the rest of the grid via either DC or special rotating frequency converters.
| Is This Answer Correct ? | 1 Yes | 2 No |
Post New Answer View All Answers
What will be the effect of circulating current in HT xlpe cable when both the armour ends are grounded. Will the termination fils after some time in case of 33 kv supply.
Explain mechanical rotational system?
in electrical control panel. how can i choose the cable rating. (example - 11kw motor, 18-25A mpcb}
What is the working principle of CFL & T5 tube light & 40W tube light with electronic ballast?
What is the use of bundle conductors?
can u please mail me the syllabus for GET exam for damodar valley corporation?
what is the common earth
What are the protection required for Transformer, motor, Line, Generator, capacitor, that all i have to refer which standard?(Like Transformer detail IS 2026)
sir am giving jspl exam on 19th oct . i belong to eee, so plz send previous question papers ..........to dis id abhilash203@gmail.com
What is the end effect of linear induction motor ??
A 500 V shunt motor runs at its normal speed of 250rpm when the armature current is 200A. The resistance of the armature is 0.12 Ω. Calculate the speed when a resistance is inserted in the field reducing the shunt field to 80% of normal value and the armature current is 100A.
what is the meaning of 0.5ohm Resistance
how the B-H loop obtain under the static condition
What will happen if we introduce negative feedback to a control system that uses a positive feedback?
What are the factors influence the choice of an electrc drive?
