Spark suppression, Physics

Assignment Help:

Spark suppression:

If we consider a circuit with a large inductance, possibly one using a magnetic relay. At the instant the switch is opened, the current through the coil is changing at maximum rate, therefore the back emf induced in the coil is also at maximum.

This emf is applied to the air gap between the switch contacts and ionises the air, producing a spark which the burns the contacts. This increases their electrical resistance and radiates energy which may cause interference, therefore sparks must be suppressed. Good design of switch contacts can help, but connecting a capacitor in parallel with the switch is the best method of eliminating sparking.

When using a capacitor the energy released by the coil charges the capacitor instead of ionising air. When the switch is closed again the capacitor discharges.


Related Discussions:- Spark suppression

Time base control 2, Time Base Control 2 Shows the effect of modifying ...

Time Base Control 2 Shows the effect of modifying the time base control on the show while there is an input voltage varying in time.

Variation of g with altitude or depth, derive an expression for the variati...

derive an expression for the variation of g with altitude or depth

Heat exchangers, One of the practical aspects of the Engineering Profession...

One of the practical aspects of the Engineering Profession includes the design of industrial equipment. Design could be described as a creative, iterative and sometimes open-ended

Motion on inclined plane, a body is thrown horizontally with a velocity of ...

a body is thrown horizontally with a velocity of u from the top of a tower. the displacement of the stone when the horizontal and vertical velocities are equal is

Calculate the magnetic field due to a circular current loop, As regards cas...

As regards cases involving the application of the Biot-Savart Law to calculate the magnetic field due to an electric current which of the following statements about why it is relat

Determine the primary current and power factor, A single-phase transformer ...

A single-phase transformer has 2000 turns on the primary and 800 turns on the secondary. Its no-load current is 5A at a power factor of 0.20 lagging. Assuming the volt drop

Determine the radius of the collapsed neutron star, A Neutron Star is forme...

A Neutron Star is formed in the aftermath of a Supernova explosion. The star was originally rotating with a period of 20 days and had a mass of 2x10 30 kg and radius of 6x10 8 m.

Mass enegy relation, write a comrehensive note on mass energa relation

write a comrehensive note on mass energa relation

Ammeter, what happened if we connect ammeter parallel to the resistor, whos...

what happened if we connect ammeter parallel to the resistor, whose current we wnt to find ,rather than in series?

PHYSICAL CHEMISTRY, Calculate the density of sodium metal. The length of th...

Calculate the density of sodium metal. The length of the body-centered cubic unit cell is 4.24 A.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd