What is meant by impulse ratio of any lightning arrester?

1 Answer

Answer :

Impulse ratio of any lightning arrester is the ratio of breakdown voltage of the wave of special duration to breakdown voltage of a 50Hz wave

Related questions

Description : What is meant by Lightning arrester or surge diverter?

Last Answer : A Surge Diverter is a device that is connected between line and earth, i.e, in parallel with the equipment under protection at the substation. It limits the duration and amplitude of the follow current

Description : What is the difference between the lightning arrester and surge absorber?

Last Answer : Lightning arrester limits the duration and amplitude of the follow current while a surge absorber reduces the steepness of the wave front for a particular surge

Description : How standard lightning impulse wave is represented?

Last Answer : Answer: Standard Lighting impulse wave is represented by 1.2/50 micro sec wave

Description : What is meant by voltage surge?

Last Answer : Voltage surge is sudden excessive rise in voltage that may be dangerous to the electrical equipment of an installation. Voltage surge cause damage to insulation of the system. Voltage surges are caused because of lightning, switching on and off the load at high voltages

Description : What is meant by protective angle? Give its value for reliable operation?

Last Answer : Protective angle is the vertical angle through the ground wire axis and the line passing from the ground wire axis to the outermost phase conductor. Its value for reliable protection is taken equal to 20-30 degrees

Description : Why Earth Wire is provided in the overhead transmission lines?

Last Answer : Earth wire is provided above the overhead transmission lines for protection against lightning strokes. The ground wire or earth wire protects the phase conductors or line conductors by attracting itself the ... traveling waves set in the lines by acting a short circuit secondary of the line current

Description : Explain Horn-gap lightning arrester with neat sketch diagram.

Last Answer : Horn Gap Type Lightning Arrester: It consists of two horn shaped metal rods A and B separated by a small air gap. The horns are so connected that distance between them gradually increases towards the ... being hot, moves up naturally along the horns. So it is elongated and naturally quenched.

Description : What is the use of lightning arrester?

Last Answer : The lighting arrester is used to discharge the high voltage surge towards the earth by the lighting strike

Description : what is lightning arrester?

Last Answer : Light arrester is a protecting device which is used at substation for protecting the devices in the substation from lighting phenomenon.      

Description : Indicate the false statement. A. Industrial noise is usually of the impulse type B. Static is caused by lightning discharges in thunderstorms and other natural electric disturbances occurring in the ... another source of man-made noise D. Flourescent lights are another source of man-made noise

Last Answer : C. Distant stars are another source of man-made noise

Description : function of equipment’s used in sub-stations : (i) Earth Switch (ii) Relay (iii) Lighting Arrester (iv) Auxiliary transformer 

Last Answer : (i) Earth Switch   It's function is to discharge the ground capacitance when line is open circuited for maintenance purpose by isolator.) Earthing switch is inter - locked with isolator from the safety point ... 3-ph, 4wire, 400V) to give supply to control room, area lighting, staff quarters etc, 

Description : A thyrite type lightening arrester :

Last Answer : A thyrite type lightning arrester : offers low resistance path to surge currents

Description : A lightening arrester connected between the line and earth in a power system  (1) protects the terminal equipment against travelling surges (2) protects the transmission line against direct ... suppresses high frequency oscillations in the line (4) reflects back the travelling wave approaching it

Last Answer : A lightening arrester connected between the line and earth in a power system protects the terminal equipment against travelling surges

Description : What is Basic Impulse Level (BIL)?

Last Answer : Basic Impulse Level (BIL) refer to the peak value of lightning impuse voltage withstand capability of the equipment

Description : Define the followings.   Insulation level, Rated short circuit breaking current, Making current, Short time rating, Impulse withstand voltage, Power frequency withstand voltage .

Last Answer : Insulation level - it is the combination of rated voltage, the corresponding impulse withstand voltage, which together characterize the insulation of the equipment as regards its ability to withstand ... wave of power frequency (50 Hz) which the insulation of equipment should withstand. 

Description : Explain the main difference between impulse and reaction turbine. 

Last Answer : When the inlet pressure of steam to the turbine is equal to outlet pressure of steam from the turbine the turbine is called the impulse turbine. In this type the heat is added is very less. ... than the inlet pressure of the steam. There is reduction in pressure with the increase in kinetic energy.

Description : Explain the principle of working of impulse steam turbine. 

Last Answer : When steam enters the turbine it suffers a change in direction and momentum, which gives rise to the rotation of the turbine. There will be no drop in pressure in impulse steam turbine.  

Description : Emulsifier protection is associated with: a) Grounding protection b) Dielectric strength protection of cables and conductors c) Lightning protection d) Fire protection

Last Answer : Ans: D

Description : Which of the following has highest diversity factor? a) Domestic lightning b) Commercial lightning c) Industrial power d) Domestic power

Last Answer : Ans: A

Description : What is the difference between surge arrestor and lightning arrestor?

Last Answer : LA is installed outside and the effect of lightning is grounded, where as surge arrestor installed inside panels comprising of resistors which consumes the energy and nullify the effect of surge.

Description : What Is The Difference Between Surge Arrestor And Lightning Arrestor?

Last Answer : LA is installed outside and the effect of lightning is grounded,where as surge arrestor installed inside panels comprising of resistors which consumes the energy and nullify the effect of surge.

Description : What is the difference between surge arrestor and lightning arrestor?

Last Answer : A:Lightning Arrestor is installed outside and the effect of lightning is grounded where as surge arrestor installed inside panels comprising of resistors which consumes the energy and nullify the effect of surge.

Description : What is the difference between surge arrestor and lightning arrestor?

Last Answer : Lightning arrestor is installed outside and the effect of lightning is grounded, whereas surge arrestor installed inside panels comprising of resistors which consumes the energy and nullify the effect of surge.

Description : What is the type of Lightning Arrestor?

Last Answer : Station type, heavy duty, gap less zinc oxide.  

Description : What is the purpose of lightning arrestor? 

Last Answer : Due to lightning and switching surges high voltages are induced in the lines. If equipment's. Connected is subjected to this high voltage the insulation will fail. In order to avoid the failure of ... current to the earth. (It will divert the over voltages to earth and protect the substation)  

Description : For a fault in switchyard lightning arrestor, what protection will act?

Last Answer : Bus bar differential protection.  

Description : Give the details of switchyard 220 kV CB, Isolator, CT, CVT and lightning arrestor.  

Last Answer : 220 kV SF6 Circuit Breaker 1. Make - ABB 2. Air pressure blocking a. Close Block - 17.3 bar. b. Open block - 16.7 bar. c. Auto reclose block - 19 bar. 3. SF6 pressure block a. Alarm - 5. ... , storage and erection. Rated voltage : 216 kV rms. Operating voltage : 184 kV rms. 

Description : What is the type of lightning arrestor for GT? 

Last Answer : Zn O (zinc oxide) types.  

Description : How generator is protected from switching surges and lightning surges? 

Last Answer : Surge capacitor and lightning arrestor.  

Description : In 220 kV switchyard why lightning arrestor should be properly grounded?

Last Answer : a. During lightning, surges should be discharged to ground, otherwise it will puncture the equipment insulation and it is possible only when lightning arrestor is grounded properly.  b. In order to make it effective ... kV. Soil resistivity a should be minimum and may be it is 3.5 ohm per meter.  

Description : Write types of lightning arrestor.

Last Answer : a. Horn gap lightning arrestor. b. Oxide film lightning arrestor. c. Pellet lightning arrestor. d. Thyrite lightning arrestor.

Description : When the electric current is passed through conducting solution, there is change in colour of the solution. This indicates a) chemical effect of current b) the heating effect of current c) the magnetic effect of current d) the lightning effect of current

Last Answer : a) chemical effect of current

Description : If you did some goofy, impulse, online shopping during the first year of the pandemic, what is your favorite item?

Last Answer : Nothing goofy, but we got a new living room set.

Description : Are inclinations an impulse?

Last Answer : I think inclinations are pre impulse. I believe that we have genetic predilections that social and physical conditions can initiate. Drives, such as hunger, generate angst drawing the attention of ... required to be inclined to focus upon the desire's preferred object. Inclination is sufficient.

Description : What impulse would make someone make jokes about the earthquake-tsunami disaster in Japan?

Last Answer : I think it’s the I’d rather laugh than cry thing. They’re covering up the pain by trying to make a joke.

Description : Where does the impulse to "sweep it under the rug" come from? Is this a helpful impulse?

Last Answer : Shame almost never works I have that sweep it under the rug' impulse too, it's been instilled in me from 40 years of conditioning from my family. When I was seeing a counselor to work through issues ( ... only my happiness, but that of those around me so I CHOOSE to face my problems head on now.

Description : How strong is your impulse to have a biological child?

Last Answer : I do have a desire to have a biological child. It's not that strong, but it would be nice. However, since I am gay, that is going to be a lot less likely to happen. If only two men could have a child ... being what I do, I won't be surprised. I do know that I want to have kids eventually. Male, 17

Description : Impulse can be obtained from a.force-time diagram b.velocity-time diagram c.107 dynes d.force displacement diagram e.velocity-displacement diagram

Last Answer : a. force-time diagram

Description : A body is pushed with a force of 10 N for 0.5 second. The impulse given to the body is a.107 dynes b.50 Ns c.3.5 Ns d.5 Ns e.2.5 Ns

Last Answer : d. 5 Ns

Description : Write a and b in the given flow chart of neuron through which information travels as an electrical impulse.Dendrite → a →b → End point of Neuron -Science

Last Answer : a. Axon b. Cell body

Description : Explain the mechanism of generation of light-induced impulse in the retina. -Biology

Last Answer : answer:

Description : Explain the mechanism through which a sound produces a nerve impulse in the inner ear. -Biology

Last Answer : answer:

Description : What is the difference between impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre? -Biology

Last Answer : answer:

Description : Mechanism of generation of light-induced impulse in the retina. -Biology

Last Answer : answer:

Description : Assertion `:` Though AV node generates impulses, it is still not called as the pacemaker of heart. Reason `:` The rythmicity of impulse production is

Last Answer : Assertion `:` Though AV node generates impulses, it is still not called as the pacemaker of heart. ... . D. If both Assertion & Reason are false.

Description : The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is

Last Answer : The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is

Description : The impulse for voluntary muscles for forced breathing starts in

Last Answer : The impulse for voluntary muscles for forced breathing starts in A. Medulla oblongata B. Vagus nerve C. Cerebellum D. Cerebrum

Description : If a force F =500-100t, then impulse as a function of time will be :-

Last Answer : If a force F =500-100t, then impulse as a function of time will be :- A. `500t-50t^(2)` B. ` 50t-10` C. `50-t^(2)` D. `100t^(2)`

Description : A body of mass `(1)/(4) kg` moving with velocity `12 m//s` is stopped by applying a force of 0.6 N. Then impulse is :-

Last Answer : A body of mass `(1)/(4) kg` moving with velocity `12 m//s` is stopped by applying a force of 0.6 N. Then ... A. 7.2 Ns B. 3 Ns C. 2.4 Ns D. None

Description : Direction of nerve impulse is reversed in nerve with

Last Answer : Direction of nerve impulse is reversed in nerve with A. Axo -axonic B. Axo-dendrite C. Axo -axondendritic D. None of the above