Category: Lightning arrester mcq

Lightning Arrester Mcq. What happens if i connect a capacitor to a generator load?. Basic Electrical and Electronic Symbols. Ground screw. An icon used to represent a menu that can be toggled by interacting with this icon. Hitachi ABB Power Grids offers a complete range of surge arresters for high and medium voltage applications. Historically, this test was a one- or two-impulse test, depending on the supplier. Cable — Different type of cables, cable rating and derating factor. In electrical power distribution systems, a protective ground conductor is an essential part of the safety earthing system.

A surge arrester is a device that protects electrical power systems from damages caused by lightning. When a lightning surge or switching surge travels along the power line to the Arrester, the current from the surge is diverted through the Arrestor, in most cases to the earth.

Types of Lightning Arresters The lightning arrester protects the electrical equipment from lightning. Sources of over voltages - Capacitor switching — lightning - ferro resonance. They trigger contactors and circuit breakers to make or break. The voltage rating of a lightning arrester depends on the type of neutral provided in the system.

Definition of a dc motor in Hindi. Difference between Surge Arrester, Lightning Arrester and Lightning Rod: Surge arrester is used to protect the circuit or electrical equipment from high voltage transient or electrical surges.

Flame Arrester In the event of lightning or another source of vapor ignition, a flame arrestor in the vent line of a storage tank prevents flames from flashing to the vapor inside the tank. When potentially dangerous lightning strikes, the arrester activates and diverts the lightning to ground, where it will disperse harmlessly.

What we are providing is content that both meets demand of the question and at the same time gives you extra points in the form of background information. When a powerful electric surge travels from the power system to the surge arrester, the high voltage current is sent directly to the insulation or to the ground to. Suppresses high-frequency oscillations in the line D. Surge voltages associated with the discharge of lightning arresters at other locations within the facility. Multiple choice questions.

All lightning arresters should withstand the maximum continuous operating voltage MCOV. Hence, during a lightning surge, it allows the current through it to the earth.Necessary cookies are absolutely essential for the website to function properly.

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Non-necessary Non-necessary.Lightning generates voltage surges in different ways and they directly hit on your house. It can strike wiring of the circuit within the walls of the house. Lightning can hit an object close to your home to cause a surge like the ground or a tree.

So it plays an essential role to protect the electrical devices and traction installation from surges. The proper protection for this device is very necessary to check the normal power supply of rolling stock for smooth running in electrified sections. This article discusses an overview of the lightning arrester, types, working, advantages and disadvantages. Definition: The circuit which is protected from the strokes of lightning with the help of a protection device is known as lightning arrester.

Here the lightning strokes are nothing but surges with high transient voltage, arcs of isolation, spark, and surge currents because of lightning, etc. These devices are used to defend the power systems by forwarding the high voltage surges in the direction of the ground.

And these power systems and over headlines can also be protected by using ground wire or the earthing from the direct strikes of lightning. The lightning arrester diagram is shown below.

Here these can be occurred during the strokes of lightning toward the ground to defend the system from the induced problems of lightning. Lightning arrestor working principle is, once the voltage surge travels throughout the conductor then it reaches the location of the arrestor where it is installed.

lightning arrester mcq

So it will break down the insulation of the lightning arrestor for a moment, so voltage surge can be discharged toward the ground. Further, the current flow toward the ground will be stopped. Generally, lightning arresters are classified into different types. The construction of lightning arrestors is different based on its type but the working principle is the same.

It provides a low resistance pathway to the surges in the direction of the ground. The types are. As the name suggests, this arrestor has two metal rods in horn-shaped. The arrangement of these metal rods can be done around a small air gap. The distance between these two rods can be increased because they increase from the gap. The metal rods are located on ceramic insulators. The connection of the horn can be done by connecting it to two dissimilar wires.

The resistance restricts the flow of current toward a minute value. The choke coil is used to provide less reactance at the usual power frequency and also provides high reactance at transient frequency. The gap among the horns can be adjusted so that the usual supply voltage is not sufficient to cause an arc. These types of arresters are designed with a sequence of metal cylinders that are insulated and divided through air gaps with each other. In the sequence of cylinders, the primary cylinder is connected toward the electrical line, whereas the remaining cylinders are connected to the ground by series resistance.

Some of the gaps among the next cylinders contain a shunt resistance that grabs a surge when there is a surplus of voltage.Different terms used for arresters are sometimes confusing even professional engineers and electricians use them interchangeably. We will discuss the main difference between the different types of arresters such as surge arrester, lightning arrester, surge suppressor and lighting rod as sometimes, they may used for same purpose. The difference shows that what kind of system you want to protect from what and how?

We will discuss all of them in details below. Surge arrester is a voltage limiting device installed inside the installation equipment panel to protect the insulation, equipment and machines not only from lightning, but also from transient voltage produced by switching, sparks, load shading and other electrical faults such as ground faults etc. Surge arresters are used to limit the current and voltage surges to protect the low and high voltage appliances as well as communication lines.

This is because the main reason for most of over voltages was lightning when the power system design was not that much complicated. In most advanced designs, load shading, sudden change in high power in load, and disconnector switching in EHV substation causes over voltage where surge arrester are used in a substation instead of lightning arrester which provides protection against all of the above mentioned surges.

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Lightning Arrester is a protective device used to protect the circuit from lightning strokes having high transient voltage surges, surge currents due to lightning, spark and isolation arcs etc. It is used to protect the power system by redirecting the high voltage surges to the ground. Although, the earthing or ground wire also protects the overhead lines and power system from direct lightning strikes but it may fail to protect against traveling waves which may reach to the terminal connected devices and equipment.

For this reason, surge diverters or lightning arresters are used to protect the power system against such produced surges by faults or lightning stokes. Lightning arresters are installed on the peak height of a structure i.

lightning arrester mcq

A lightning rod also known as lightning conductor is a metal rod copper or aluminium or other conducting materials installed on the top of the structure transmission and distribution towersbuildings etc to protect it from the direct lighting strikes. Lightning is the electrostatic discharge between clouds and earth.

If they hit the power lines directly, the system voltage may rise to a dangerous level which may harm the electrical installation and equipment. For this reason, a lightning rod is used to protect the electrical installation, equipment and devices from direct hit of lightning strokes. Lightning rod is cheaper than surge arrester which is mounted on the top surface of a building or power lines tower which provides a safe path to the high value electrostatic charges and lightning currents to the ground it must be properly earthed to the grounding system as well.

Surge Suppressor is also known as surge protector or transient suppressor. It is a device installed in the home distribution board to protect the home wiring installations from voltage surges or switching surges.Impulse ratios of insulators and lightning arresters should be.

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In a thyrite lightning arrester the resistance. Varies linearly with the applied voltage.

lightning arrester mcq

Decreases linearly with the applied voltage. Is high at low current and low at high current.

Difference between Lightning Arrester and Surge Arrester

Blocks the search voltage appearing in a line. Absorbs the surgery voltage appearing in a line. Offers a low resistance path to the surge appearing in a line. Which of the following is the protective device against lightning over voltages? A low impedance path between line and ground, during operation. A high impedance path between line and ground, during operation. A low resistance path between line and ground, during operation. A high resistance path between line and ground, during operation.

Enter the code above here : Can't read the image? Click here to refresh. Contact us: info mechanicaltutorial. Lightning arrester Lightning arrester Objective Type Questions and answers. Your name: Your Email: Your Comments:.

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Increases with the applied voltage. Returns the surge back to the source.Lightning Arrester Mcq. 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.

A lightning arrester alternative spelling lightning arrestor also called lightning diverter is a device used on electric power systems and telecommunication systems to protect the insulation and conductors of the system from the damaging effects of lightning. Utilization of Electrical Energy, Illumination, electric heating, Electric welding, electroplating, electric drives and motors. Protects the terminal equipment against travelling surges B.

Lightning Arrester Mcq

Electrical apparatus for switching or protecting electrical circuits, or for making connections to or in electrical circuits for example, switches, fuses, lightning arresters, voltage limiters, surge suppressors, plugs and other connectors, junction boxesfor a voltage exceeding 1, volts: Cable — Different type of cables, cable rating and derating factor.

Home; Electrical Theory. Surge arresters are installed inside the panels to cancel out the surges. Definition of Fleming right hand rule in Hindi. Although both surge diverter and surge absorber remove the surge, the manner in which it is done is different in the two devices.

Testing of Lightning Arresters/Surge Arresters in a Substation

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. This over time causes wear and tear and the decrease of the. It is clear that it is consists of a spark gap in series with a nonlinear resistor. All lightning arresters should withstand the maximum continuous operating voltage MCOV.

When a lightning surge or switching surge, which is very similar travels along the power line to the arrester, the current from the surge is diverted through the arrestor, in most cases to earth. Make sure the electrical cord is firmly gripped by the arrestor clips.

A lightning arrester or a surge diverted is a protective device, which conducts the high voltage surges on the power system to the ground. Question Whenever you. They are cheaper than using static wicks.Explanation: No explanation is available for this question!

Dear Readers, Welcome to High Voltage Engineering multiple choice questions and answers with explanation. Specially developed for the Electrical Engineering freshers and professionals, these model questions are asked in the online technical test and interview of many companies. Fresh Trending Easy Medium Hard. Average value b. Peak value c.

Quasi-peak value d. All of these. Conductor b. Non-conductor c. Semiconductor d. Visible in oscillograms b. Loud noise produced c. External flashovers d. Full wave standard impulse b. Chopped wave standard impulse c. Half wave standard impulse d. Only a and b e. Less than 1 hr b.

Lightning arrester | Lightning arrester Objective Type Questions and answers

More than hr d. Increases with humidity b. Humidity effect decreases with the size of spheres d. Sphere gaps b. Field gaps c. Rod gaps d. Positive half cycle b.

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Negative half cycle c.


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