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

Electromagnetic induction, what is construction,,, principle...and working ...

what is construction,,, principle...and working of AC generator

Poission;s theory, what is poission''s equation?Establish poisson''s equati...

what is poission''s equation?Establish poisson''s equation for space distribution of charges.discuss its significance.

Phases of matter , Freezing, condensation, and deposition are what kind of ...

Freezing, condensation, and deposition are what kind of processes because heat is removed from matter as they occur

Dielectrics, a parallel pate capacitor has two dieletric slabs between the ...

a parallel pate capacitor has two dieletric slabs between the plates with interface normal to E and D.the thickness of each slab is 1cm,area is 100cm2.neglect fringing effects.dete

Binding Energy per nucleon, The average energy needed to release a nucleon ...

The average energy needed to release a nucleon from the nucleus is known as binding energy per nucleon.   Binding energy per nucleon diffrence  Stability of nucleus

Explain working principle of d.c motor, Working Principle of D.C Motor ...

Working Principle of D.C Motor A) An electric motor is a machine which changes electrical energy into mechanical energy. B) When a current carrying conductor is placed in a

Complex variables and rlc circuits, The project consists of a word processe...

The project consists of a word processed (typed) report submitted by the project report due date. Late submissions are penalized 10% of the mark per day, including Saturdays and Su

Electronic polarization, It is defined as an electric strain produced in an...

It is defined as an electric strain produced in an atom due to application of external electric field to the bulk material. It is the result of the displacement of the positively c

#PhysicsofVolleyball, Is there a way that you can gain potential energy and...

Is there a way that you can gain potential energy and release kentic energy in Volleyball?

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