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

Digestion sytem, what is the substance produced in the liver that acts in t...

what is the substance produced in the liver that acts in the small intestine during digestion?

How will we define charge? , Electric charge is a physical property of matt...

Electric charge is a physical property of matter that causes it to experience a force when near other electrically charged matter. There exist two types of electric charges, called

An egg beater, An egg beater Study an egg beater, hand drill or some o...

An egg beater Study an egg beater, hand drill or some other device in which an enhance of speed is obtained by means of gears.

Acsr (aluminium conductor steel reinforced), ACSR (Aluminium Conductor Stee...

ACSR (Aluminium Conductor Steel Reinforced): Owing to the low tensile strength of aluminium, aluminium conductors produce greater sag which prohibits their use for longer spans

A high voltage generator, The electrostatic shielding may be found by prote...

The electrostatic shielding may be found by protecting and enclosing the sensitive instruments inside a hollow conductor due to inside hollow conductors, electric fields is zero.

Descrieb the types of magnetic material, On the basis of mutual interaction...

On the basis of mutual interactions or behavior of several materials in an external magnetic field, the materials are dividing in three basic categories. (i) Diamagnetic materi

Find refractive index of water using newtons ring, Briefly explain with nec...

Briefly explain with necessary theory how you will calculate refractive index of water/transparent liquid by using Newton's ring apparatus?

Capacitance, Capacitance: If we increase the voltage between the plates...

Capacitance: If we increase the voltage between the plates, the charge increases, but the ratio of charge to voltage remains the same.  This ratio gives the capacitance (C)  of

Microwave, Write an assembly program to make a microwave. Need: 1.    T...

Write an assembly program to make a microwave. Need: 1.    The microwave has a clock (hh:mm:ss am/pm) and the user should be able to alter the clock at any time. 2.    For c

Magnetic materials, Magnetic materials: Ferromagnetic materials: ...

Magnetic materials: Ferromagnetic materials: Ferromagnetic materials can be easily magnetised and exhibit strong magnetic properties. This group can be further sub

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