Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

We have discussed about the theory of ideal transformer for better understanding of actual elementary theory of transformer. Now we will go through the practical aspects one by one of an electrical power transformer and try to draw vector diagram of transformer in every step. As we said that, in an ideal transformer; there are no core losses in transformer i.e. loss free core of transformer. But in practical transformer, there are hysteresis and eddy current losses in transformer core.Theory of

Armature winding in an alternator may be either closed type open type. Closed winding forms star connection in armature winding of alternator.There are some common properties of armature winding. First and most important property of an armature winding is, two sides of any coil should be under two adjacent poles. That means, coil span = pole pitch. The winding can either be single layer or double layer. Winding is so arranged in different armature slots, that it must produce sinusoidal emf.Types

The electric motor is a device which converts electrical energy to mechanical energy. There are mainly three types of electric motor. DC Motor. Induction Motor. Synchronous Motor.All of these motors work in more or less same principle. Working of electric motor mainly depends upon the interaction of magnetic field with current.Now we will discuss the basic operating principle of electric motor one by one for better understanding the subject.Working of DC MotorWorking principle of DC Motor mainly

What is an Armature?An armature is the component of an electric machine (i.e., a motor or generator) that carries alternating current (AC). The armature conducts AC even on DC (Direct Current) machines via the commutator (which periodically reverses current direction) or due to electronic commutation (e.g., in a brushless DC motor).The armature provides housing and support to the armature winding, which interacts with the magnetic field formed in the air gap between the stator and the rotor. The

What is a Transformer?Atransformeris defined as apassive electrical devicethat transfers electrical energy from one circuit to another through the process ofelectromagnetic induction. It is most commonly used to increase (‘step up’) or decrease (‘step down’)voltagelevels between circuits.Working Principle of TransformerThe working principle of a transformer is very simple. Mutual induction between two or more windings (also known as coils) allows for electrical energy to be transferred between c

What is an Electric Motor?An electric motor (or electrical motor) is an electric machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor’s magnetic field and electric current in a wire winding. This interaction generates a force (as per Faraday’s Law) in the form of torque which is applied to the motor’s shaft.Electric motors can be powered by direct current (DC) sources, such as batteries or rectifiers. Or by alterna

When a conductor moves in a magnetic field, an emf is induced across the conductor. This is the only basis on which each and every rotating electric generator works (such as portable generators).According to Faraday’s law of electromagnetic induction, when a conductor links with a changing flux, it will have an induced emf across it. The value of induced emf across the conductor depends on the rate of change of flux linkage with the conductor. The direction of the induced emf in the conductor ca

What is a Slip Ring?A slip ring is defined as an electromechanical device that is used to connect a stationary system to a rotating system. It is used in applications that require rotation while transmitting power or electrical signals.The slip ring also is known as an electrical rotary joint, rotating electrical connector, or electrical swivels. It is used in various electrical machines to improve mechanical performance and simplify the operation.If a device rotating for a fixed number of revol

Emf Equation of TransformerEMF Equation of transformer can be established in a very easy way. Actually in electrical power transformer, one alternating electrical source is applied to the primary winding and due to this, magnetizing current flowing through the primary winding which produces alternating flux in the core of transformer. This flux links with both primary and secondary windings. As this flux is alternating in nature, there must be a rate of change of flux. According to Faraday’s law

What is a Rogowski Coil?The Rogowski coil is defined as an electrical device that is used to measure alternating current (AC). It is also used to measure the high-speed transient, pulsed current or sinusoidal current. The name Rogowski coil was named after the German physicist Walter Rogowski.A Rogowski coil is an evenly wounded coil with N number of turn and constant cross-section area A. There is no metal core in a Rogowski coil.The end terminal of the coil is returned through the central axis