search
person

1 Answer

Transmission lines use high voltage to reduce the amount of power loss over long distance.

This power loss can come from large current running through the cable due to the resistance of the cable conductor. Stepping up the voltage reduces the amount of current through transmission lines.
thumb_up_alt 0 like thumb_down_alt 0 dislike
Why then can't  we  apply the formular V=IR.since we know that increase in voltage results in increase in current

Related questions

Description : What happens insulators when high voltage passes through transmission lines whether it breaks or lose it's insulating property?

Answer : I think it will breaks when it crosses breakdown voltage .

Description : Bundled conductors are mainly used in high voltage overhead transmission lines to (a) Reduce line loss (c) Reduce corona (b) Reduce harmonics (d) Increase strength

Answer : Bundled conductors are mainly used in high voltage overhead transmission lines to Reduce corona 

Description : why we use aluminium conductor and not copper in transmission lines ?

Answer : Because copper conductor are costlier than aluminium conductor

Description : For extra high voltage ac transmission lines, conductors used are (a) All aluminium (b) All steel (c) AAAC (d) ACSR

Description : State the advantages of use of high voltage in transmission of Electric power. 

Answer : Advantages: 1. As Transmission voltage increases, current decreases. 2. As current decreases, cross section of conductor decreases. 3. As cross section of conductor decreases, its ... high voltage transmission line, successful interconnection of transmission line is possible than low voltage. 

Description : Why high voltage is used in power transmission?

Answer : The primary reason that power is transmitted at high voltages is to increase efficiency. ... The lower current that accompanies high voltage transmissionreduces resistance in the conductors aselectricity flows ... This means that thin, light-weight wires can beused in long-distance transmission.

Description : HV transmission lines use   (a) Pin type insulators (b) Suspension insulators (c) Both (a) and (b) (d) None of the above

Description : Why are overhead transmission lines not insulated?

Answer : Insulators are useful to help separate electrical conductors when they come into physical contact. Overhead Transmission Lines Are Not Insulated: The overhead transmission line is carrying extreme high voltage and ... a whole lot of thick insulation to absorb the heat produced by such high voltage.

Description : Why do brids not have respiratory trouble at the time of flying at high altitude ? (1) Their lungs are very large (2) They fly inactively (3) They have extra air sacs (4) They use less oxygen

Answer : They have extra air sacs

Answer : Series capacitors on transmission lines are of little use when the load VAR requirement is small.

Description : State the effects of low power factor on efficiency and voltage regulation of short transmission lines. 

Answer : i) Effect of Low power factor on efficiency:- When power factor of load reduces current drawn by transmission line increases so copper losses in transmission line increases, hence transmission ... increases, so voltage drop in transmission line increases so regulation increases. (Become Poor) 

Description : In long AC transmission lines, the receiving end voltage becomes greater than sending end voltage at light load or no load operation. This is due to (a) Ferranti effect (b) Skin effect (c) Proximity effect (d) Corona effect 

Answer : According to our application, we need low voltage and high voltage transformer.  High voltage tsansformer also called step up transformer. Low voltage transformer also called step down transformer ... tranformer used in consumer side or substation or special application like battery,etc...

Description : Why transmission voltages are high?

Answer : If current is high then I2R losses will be more .If I2R losses is more then heat generated is more. By heat or increasing temperature resistance will also be increase which will decrease ... voltage we are decreasing current which is advantageous. That's why transmission voltages is high.

Description : The main consideration for operating transmission line at high voltage is (a) to increase efficiency only. (b) to reduce power loss only. (c) to increase power transmission capability only. (d) All of the above

Answer : to reduce power loss: this is because when power is generated, it is generated at a very low voltage but because it is going to be transported over a long distance it is needed to be increase in order to avoid losses on the way such as copper loss and Eddy loss.

Description : High Voltage DC (HVDC) transmission is mainly used for  (A) bulk power transmission over very long distances (C) inter-connecting two systems with same nominal frequency (C) eliminating reactive power requirement in the operation (D) minimizing harmonics at the converter stations

Answer : High Voltage DC (HVDC) transmission is mainly used for bulk power transmission over very long distances 

Description : In case of a ‘High Voltage DC’ transmission, how many minimum conductors are required?

Answer : In case of a ‘High Voltage DC’ transmission, how many minimum conductors are required? one

Description : In order to reduce the harmful effects of harmonics on the AC side of a high voltage DC transmission system_____ are provided. (A) synchronous condensers (B) shunt capacitors (C) shunt filters (D) static compensators

Answer : In order to reduce the harmful effects of harmonics on the AC side of a high voltage DC transmission system shunt filters are provided. 

Description : The effect of corona in high voltage a.c. transmission line is  A) Increased energy loss in the transmission line B) Increased line reactance C) Increased line to line capacitance D) All of the above 

Description : What is meant by extra high voltage transmission?

Answer : HT & LT  two types transmission in industrial line 

Description : What are the advantages of high voltage transmission?

Answer : Advantages:  1. As Transmission voltage increases, current decreases. 2. As current decreases, cross section of conductor decreases. 3. As cross section of conductor decreases ... line increases  12. As transmission voltage increases power handling capacity of transmission line increases 

Description : Why is voltage increases before transmission?

Description : Why do we use AC current in our homes?

Answer : We used it for cooking rice,  For washing clothes and for lights in the house.

Description : What type of earthing is used by transmission lines?

Answer : Preventive  multiple  earthing  PME.

Description : The main limitation for power handling capability of short length transmission lines and cables is (A) power factor (B) stability (C) thermal effect limit (D) conductor size

Answer : The main limitation for power handling capability of short length transmission lines and cables is thermal effect limit

Description : Bulk power transmission over long HVDC lines is preferred because of

Answer : Bulk power transmission over long HVDC lines is preferred because of Low cost of HVDC terminal

Description : Shunt Inductors are primarily installed in transmission lines to : (A) Improve Power Factor (B) Improve Stability (C) Reduce Ferranti Effect (D) Improve Voltage Profile

Description : Transmission lines are transposed to : (A) Reduce copper loss (B) Reduce skin effect (C) Prevent interference with neighbouring telephone lines (D) Prevent short-circuit between any two lines

Answer : a

Description : In case of open circuited transmission lines the reflection coefficient is given by (A) 1 (B) -1 (C) 0.5 (D) 0

Description :  Transmission lines connect: -  a) Generating station to a switching station / step down transformer station b) Step down transformer station to service transformer banks c) Distribution transformer to consumer premises d) Service points to consumer premises

Answer :  Transmission lines connect: - Generating station to a switching station / step down transformer station 

Description : Hollow conductors are used in the transmission lines to:  (1) Improve heat dissipation (2) Reduce corona loss (3) Reduce skin effect (4) Reduce the line inductance

Answer : Hollow conductors are used in the transmission lines to: Reduce corona loss.

Answer : Copper conductors are generally used for transmission lines because it has longer life and high conductivity.

Answer : The transmission lines which feed different sub-stations represent primary distribution.

Answer : On the basis of distance from generating station to distributers

Description : Why is it cheaper to transmit electrical energy at high voltage?

Answer : Because of the electrical energy was step upped by transformers the transformer have high efficiency than the electric energy is cheaper

Description : Why high voltage test is done?

Description : Why high voltage can reduce power loss?

Answer : when voltage has increased due to reduced current flow, thus power loss given by ( I^2R) will be low due to reduced current(I^2) provided that resistance (R) is constant.

Description : Why don't we burry power lines underground ?

Answer : Because conductor used for power transmission are not insulated and if we do so it create phase to ground fault causing interruptions to supply.

Description : Why do teachers use teaching aid? Options: A) To make teaching fun-filled B) To teach within understanding level of students C) For students’ attention D) To make students attentive

Answer : B) To teach within understanding level of students 

Description : Why do teachers use teaching aid? (A) To make teaching fun-filled (B) To teach within understanding level of students (C) For students’ attention (D) To make students attentive

Answer : (B) To teach within understanding level of students

Description : 1. Why do Electricians use rubber gloves while working? 2. For which disease no vaccine is yet available? 3. Which part of the Constitution deals with the Directive Principles of State Policy? ... the Arctic regions? 20. By whom was 'Mitakshara', an authoritative treatise on Hindu law, written?

Answer : Answer : 1. Rubber is an insulator 2. Malaria 3. Part IV 4. Semangs of Malaysia 5. Satvahan 6. The Lords 7. Its creditors 8. Diamond 9. Mediterranean 10. Pataliputra 11. Due to Seismonasty 12. 11 ... In around 1000 B.C 16. Badminton 17. Zero 18. Auxins 19. 21st March to 23rd September 20. Vagneswara

Description : Why do we use 50 Hz or 60 Hz only ?

Description : Why do we use Gauss elimination method?

Description : Why do we use VLSI?

Answer : VLSI is Very Large Scale Integration. VLSI is very useful for compact design. More functionalities in smaller size. VLSI IC have small power consumption as compared to discrete components circuit. VLSI can be use for different functions in compact size.

Description : Why do we use automation?

Description : if the rated voltage from the power lines is applied to the primary of a single-phase transformer which is operated on no-load, then

Answer : if the rated voltage from the power lines is applied to the primary of a single-phase transformer which is operated on no-load, then input voltage is sinusoidal and input current is non sinusoidal.

Description : How do I use a dual trace oscilloscope to determine AC voltage and current response in a given R, L, and C circuit?

← Prev Question Next Question →
editAsk a Question
...