Interested to Buy Any Domain ? << Click Here >> for more details...
what are the advantages of having high voltage in transmission
lines?
- 5 Answers
- 8524 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 is cut-off rate?
If the line voltage is reduced to 75% of its rated value then by what percentage current will reduce ?? 75% 25% 50% no change and why ?
how to avoid electrical shock how capacitor store charges wat are the speed control of induction motors state faradays law flemings left hand rule what is rotary converter wat is transmission and distribution what are the sources of energy abrevation of acb,vcb,sf6,igbt what is output equation of transformer which test copper iron and iron loss are calculated what is eddy current draw a single line diagram (10 marks) draw direct online starter(10 marks)
There are Two questions about Steam Turbine Generator... What is HRSG bypass of LP, HP used for in power generation? In particualar, in the event that fault of HP bypass, there would be STG TRIP in operation but none on the LP bypass fault...what's the reason ?
WHAT IS AIR GAP VALUE IN MM FOR A 11KV BUSHING OF 11KV/440V DISTRIBUTION TRANSFORMER. AND AIR GAP VALUE OF 25 KV BUSHING OF AT TRANSFORMER OF 25 KV TRACTION. WHAT IS THE CALCULATION FOR THE AIR GAP PERMITTED FOR BUSHINGS AT DIFFERENT VOLTAGES.
how many joint can done in HT line and what is life of the joint
why and where we use early make & late break contacts in protection?
The metal-enclosed switchgear and controlgear is subdivided into three types: 1. metal-clad switchgear and controlgear; 2. compartmented switchgear and controlgear 3. cubicle switchgear and controlgear. What is the main differnence between them. State some example.
Define super node?
Why reactors use before incoming of ac vvfd drive?
State the frequency for rc phase shift oscillator?
what is the difference between b c d curves on mcb
How can I calculate ISF of current transformer?
where is the need for short circuit test for 3 see is required and why? can you explain in brief with application
how many electricity poles are there and what are the names and their sizes.
