what is mean by long transmission line ?

what is mean by long transmission line ?
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1 Answer

Answer :

The transmission line which have length more than 250 km are known as long transmission lines.

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Related questions

Why is AC better for long distance power transmission than DC ?

Description : Why is AC better for long distance power transmission than DC ?

Last Answer : ac is more economical to transmit for long distances . wires can be made smaller by step up transformer .. since major cost are wires to transmit .. then at the end of distance step down transformer is used for commercial use.

For a 500 Hz frequency excitation, a 50 km long power line will be modeled as

Description : For a 500 Hz frequency excitation, a 50 km long power line will be modeled as

Last Answer : For a 500 Hz frequency excitation, a 50 km long power line will be modeled as long line

Which relays are used for phase faults on long line?

Last Answer : Impedance relays are used for phase faults on long line.

The standard for long distance analog signal transmission in process control industry is

Description : The standard for long distance analog signal transmission in process control industry is (A) 4-20 mV (B) 0-20 mA (C) 4-20 mA (D) 0-5 V

Last Answer : The standard for long distance analog signal transmission in process control industry is 4-20 mA

what is mean by medium transmission line ?

Description : what is mean by medium transmission line ?

Last Answer : The transmission line which have length between 80 km to 250 km is known as medium transmission line.

what is mean by short transmission line ?

Description : what is mean by short transmission line ?

Last Answer : The transmission lines which have length less than 80 km is known as short transmission lines.

effect of inductance and capacitance on performance of transmission line.

Description : effect of inductance and capacitance on performance of transmission line.

Last Answer : Following are the effect on performance of transmission line:  1. Due to inductance (L) voltage drop in transmission line produces.  2. Capacitor (C) draws charging current ... , transmission line efficiency, voltage regulation & also power factor of transmission line gets affected. 

While calculating performance of medium transmission line, what assumptions are made in case of (i) Nominal 'T' Method (ii) Nominal 'TT' Method.

Description : While calculating performance of medium transmission line, what assumptions are made in case of (i) Nominal 'T' Method (ii) Nominal 'TT' Method. 

Last Answer : (i) Assumptions are made in case of Nominal 'T' Method:  a. It is assume that line capacitance is connected at center of transmission line. b. It is assume that half ... assumed that transmission line resistance & reactance per phase is connected in between two half transmission line capacitance 

HVDC transmission line in India:

Description : HVDC transmission line in India: 

Last Answer : HVDC transmission line in India:  S.N .  From To  Voltage 1 Rihand (U.P) (from 1990) Dadri +- 500 KV (bipolar) 2 Talcher- is the biggest ... (Chandrapur) Western Region  140KV   8 Connecting Southern region(Vizag- Gajuwaka) Eastern Region 140KV 

effect of line parameter on performance of transmission line.

Description : effect of line parameter on performance of transmission line. 

Last Answer : Following are the effect of line parameter on performance of transmission line:  1. Due to resistance (R), voltage drop in transmission line & copper losses in transmission line ... transmission line efficiency, voltage regulation & also power factor of transmission line gets affected. 

Why is transmission line 11kV, 33kV 66kV Not Is 10kV, 20kV, 30kV ?

Description : Why is transmission line 11kV, 33kV 66kV Not Is 10kV, 20kV, 30kV ?

Last Answer : 10kv plus to compensate losses in olden days 1kv were added and transmitted. Since all equipment used for transmission have a multiple of 11 from olden days, still that is being followed even though the losses are ... voltages, multiples of 11 is eazy for winding ratios.. i.e. 11kv to 33kv is 1:3.

A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient?

Description : A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient? A) 0.69 B) 1.69 C) 6.9 D) 16.9 

Last Answer : A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient? A) 0.69 B) 1.69 C) 6.9 D) 16.9 

The sag of a transmission line is least affected by

Description : The sag of a transmission line is least affected by (A) Self weight of the conductor. (B) Temperature of the surrounding air. (C) Current through the conductor. (D) Ice deposited on the conductor.

Last Answer : The sag of a transmission line is least affected by Current through the conductor.

For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is

Description : For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is

Last Answer : For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is 0.707 lead

A transmission line of 200 km has a certain A, B, C and D parameters. If the length is reduced to 60 km

Description : A transmission line of 200 km has a certain A, B, C and D parameters. If the length is reduced to 60 km

Last Answer : A transmission line of 200 km has a certain A, B, C and D parameters. If the length is reduced to 60 km A increases, B decreases

State the limitations of EHVAC transmission line.

Description : State the limitations of EHVAC transmission line. 

Last Answer : Following are the Limitations of EHVAC Transmission:   1. Insulation cost increases as voltage increases 2. Skin effect is more 3. Proximity effect is more. 4. Corona loss increases. 5. Radio ... 18. EHVAC is economical only for bulk amount of power is to be transmitted over long distance. 

State line parameters of transmission line.

Description : State line parameters of transmission line. 

Last Answer : Following are the of Line parameters of transmission line:  1. Resistance  2. Inductance  3. Capacitance

State the impact of inductance and resistance on transmission line performance

Description : State the impact of inductance and resistance on transmission line performance

Last Answer : Impact of inductance on transmission line: 1) It causes IXL drop in transmission line which affects regulation. 2) It is the only parameter which decides power transmission capacity of line i. ... is very small, it causes losses, temperature rise& poor voltage regulation so it cannot be neglected

Stability of a transmission line can be increased by

Description : Stability of a transmission line can be increased by

Last Answer : Stability of a transmission line can be increased by Shunt capacitor, Series capacitor

In a transmission line if booster transformers are to be used, preferred location will be

Description : In a transmission line if booster transformers are to be used, preferred location will be  (A) At the receiving end (B) At the sending end (C) At the intermediate point (D) Anywhere in the line 

Last Answer : In a transmission line if booster transformers are to be used, preferred location will be At the intermediate point

A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of

Description : A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of

Last Answer : A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of 0.02 P.U

Series capacitive compensation in EHV transmission line is used to

Description : Series capacitive compensation in EHV transmission line is used to

Last Answer : To maintain voltage stability 

The sending end and receiving end voltages of a three-phase transmission line are 10 kV/ph and 9.5 kV/ph,

Description : The sending end and receiving end voltages of a three-phase transmission line are 10 kV/ph and 9.5 kV/ph, respectively. If the resistance drop is 150 V/ph and receiving end power factor is 0.8, the sending end power factor is (A) 0.745 lagging (B) 0.775 lagging (C) 0.8 lagging (D) 0.85 lagging

Last Answer : Vscos¢s-Vrcos¢r=IR

Transmission efficiency of a transmission line increases with the

Description : Transmission efficiency of a transmission line increases with the

Last Answer : Transmission efficiency of a transmission line increases with the increase in power factor and voltage

Which relay is preferred for phase fault on short transmission line?

Last Answer : Reactance relay is preferred for phase fault on short transmission line.

When a wave propagates on a transmission line, it suffers reflection several times at?

Last Answer : When a wave propagates on a transmission line, it suffers reflection several times at sending and other end.

The interaction between a transmission line and communication line is minimized by?

Last Answer : The interaction between a transmission line and communication line is minimized by transposing transmission as well as communication lines, increasing the height of the transmission line tower, increasing the distance between the two lines.

When a transmission line is energized, the wave that propagates on it is?

Last Answer : When a transmission line is energized, the wave that propagates on it is current wave and voltage wave.

A transmission line is protected by?

Last Answer : A transmission line is protected by distance protection, time graded and current graded overcurrent protection.

Draw a neat sketch and explain the accessory used to support long work.

Description : Draw a neat sketch and explain the accessory used to support long work.

Last Answer : Accessory to support long work: A steady rest is a tool for a lathe, enabling a machinist to make deep cuts in long, slender stock, bore out thin pieces of metal, and generally keeps thin stuff straight. ... tool that follows the cutter, a steady rest is firmly attached to the bed of a lathe.

Power for lighting in passanger coach, in a long distance electric train, is provided?

Last Answer : Power for lighting in passanger coach, in a long distance electric train, is provided through individual generator of bogie and batteries.

A cumulatively compounded long shunt generator when operating as a motor would be?

Last Answer : A cumulatively compounded long shunt generator when operating as a motor would be differentially compounded long shunt.

requirements or properties of the line supports used in transmission and distribution.

Description : requirements or properties of the line supports used in transmission and distribution.  

Last Answer : Following are requirements or properties of the line supports used in transmission and distribution. 1. High mechanical strength:-  It should have high mechanical strength to withstand against - ... . 8. Appearance: It should have good appearance or They must be of pleasing shape

Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at the line terminals (c) Possibility of better protection for the line due to possible use of higher terminal reactants (d) Improvement of power factor at times of moderate and heavy loads (e) Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Description : Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at ... of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Last Answer : (a) Increase of short-circuit current of the system

Is the power line voltage available in our homes a dc or an ac voltage?

Description : Is the power line voltage available in our homes a dc or an ac voltage?

Last Answer : The power line voltage available in our homes is AC. Mobile dwellings are the most commonly DC-supplied homes and even then they tend to include AC supply for heavier loads.

Define load and line regulation.

Description : Define load and line regulation.

Last Answer : 1. Load regulation : The load regulation indicates how much the load voltage changes when the load current changes. The load regulation is defined as:  % Load regulation = (VNL-VFL) / VFL *100  ... the power supply. A well-regulated power supply can have a line regulation of less than 0.1%.  

Pure inductive circuit takes power from the A.C. line when?

Description : Pure inductive circuit takes power from the A.C. line when?

Last Answer : It takes power when voltage decreases and current increases.

What are the factors that limit the maximum power transfer capability in a transmission line?

Description : What are the factors that limit the maximum power transfer capability in a transmission line?

Last Answer : Answer: Some of the factors which limits the maximum power transfer are: 1. Electrical phase shift 2. Voltage drop 3. Thermal effects in the line

Which of the following characteristics should the line supports for transmission lines possess ? (a) Low cost (b) High mechanical strength (c) Longer life (d) All of the above

Description : Which of the following characteristics should the line supports for transmission lines possess ? (a) Low cost (b) High mechanical strength (c) Longer life (d) All of the above

Last Answer : (d) All of the above

Transmission line insulators are made of (a) glass (b) porcelain (c) iron (d) P.V.C.

Description : Transmission line insulators are made of (a) glass (b) porcelain (c) iron (d) P.V.C.

Last Answer : B

How many insulator disc used for 33 kV transmission voltage line?

Description : How many insulator disc used for 33 kV transmission voltage line?

Last Answer : 5,As 33kv is Vrms

necessity of transmission of electricity.

Description : necessity of transmission of electricity.

Last Answer :  Because of following points there is necessity of transmission of power:   1. Electrical load on power system is not concentrated at one place but it is widely spread.  2. Load ... to the point of actual utilization of it (consumers) for this purpose transmission electricity is necessary. 

Why are overhead transmission lines not insulated?

Description : Why are overhead transmission lines not insulated?

Last 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.

i) State the significance of modulation index in AM transmission. ii) Explain the effect of modulation index on AM wave with waveforms.

Description : i) State the significance of modulation index in AM transmission. ii) Explain the effect of modulation index on AM wave with waveforms.

Last Answer : Significance of modulation index in AM transmission  It is used to determine the strength and quality of transmitted signal. If the modulation index is small, then the amount of variation in ... amplitude part of its information is lost in the process of modulation which is undesirable.

Compare characteristics of asynchronous and synchronous transmission mode.

Description : Compare characteristics of asynchronous and synchronous transmission mode (four points). 

Last Answer : Synchronous transmission Asynchronous transmission 1. Synchronous transmission are synchronized by an external clock. 1. Asynchronous transmission are synchronized by special signals along the transmission ... for transferring a small amount of data as it is simple and economical.

The permissible voltage variation in transmission and distribution system is:

Description : The permissible voltage variation in transmission and distribution system is:  (A) ± 0.1% (B) ± 1% (C) ±10% (D) ± 25%

Last Answer : The permissible voltage variation in transmission and distribution system is: ±10%

Skin effect is absent in which of the following transmission systems?

Description : Skin effect is absent in which of the following transmission systems? A) Extra High Voltage (EHV) AC B) High Voltage Direct Current (HVDC) C) Both A and B D) None of these

Last Answer : Skin effect is absent in which of the following transmission systems? A) Extra High Voltage (EHV) AC B) High Voltage Direct Current (HVDC) C) Both A and B D) None of these

For the women: Does a mans chin and jaw line effect whether he's more attractive?

Description : For the women: Does a mans chin and jaw line effect whether he's more attractive?

Last Answer : I like a nice strong chin but it’s not a deal-breaker by any means.

How to Spool Line Onto a Reel

Description : How to Spool Line Onto a Reel

Last Answer : How to Spool Line Onto a Reel If you think of fishing as a sport or a hobby, you must always make sure that you have efficient fishing tools with you all the time. Your fishing rod must ... you'll always have good quality fishing line and an efficient fishing reel to use during your fishing trips.

How to Replace Edge Trimmer Line

Description : How to Replace Edge Trimmer Line

Last Answer : How to Replace Edge Trimmer Line An edge trimmer line is a very efficient equipment for any avid gardener. This small diameter line, usually made of plastic or other material, cuts various vegetation, ... your edge trimmer lines regularly. It'll save you time and give you a great-looking landcaping.