Encyclopedia Knowledge

Eddy Current Definition According to Lenz’s law, when a conducting loop is exposed to a changing magnetic field, it generates an emf that induces a current opposing the change. Similarly, when a magnetic field changes through a conducting body, like a filament or a slab, it causes currents to flow t

Leakage Reactance Definition In a transformer, not all the flux links both the primary and secondary windings. Some flux links with only one winding, called leakage flux. This leakage flux causes self-reactance in the affected winding. This self-reactance is also known as leakage reactance. When com

Losses in Transformer As the electrical transformer is a static device, mechanical loss in transformer normally does not come into picture. We generally consider only electrical losses in transformer. Loss in any machine is broadly defined as difference between input power and output power. When inp

Transformer Definition A transformer is defined as an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. Theory of Transformer on No-Load Having No Winding Resistance and No Leakage Reactance Consider a transformer with only core losses

Vector Group Test Definition The vector group test of a transformer checks the phase sequence and angular difference to ensure transformers can operate in parallel. Vector Group Test of Transformer The vector group of a transformer is essential for successful parallel operation of transformers. Ever

Dielectric Test Definition The dielectric test of a transformer checks the insulation’s ability to handle voltage without breaking down. Separate Source Voltage Withstand Test of Transformer This dielectric test checks the main insulation’s ability to withstand voltage between the winding and the ea

Temperature Rise Test Definition A temperature rise test of a transformer checks if the temperature increase of its winding and oil meets specified limits. Temperature Rise Test for Top Oil of Transformer First, the LV winding of the transformer is short-circuited. Then one thermometer is placed in

Winding Resistance Test Definition The winding resistance test of a transformer checks the health of transformer windings and connections by measuring resistance. Procedure of Transformer Winding Resistance Measurement For star connected winding, the resistance shall be measured between the line and

What is the Torque Equation of DC Motor? Torque Definition Torque in a DC motor is defined as the force’s tendency to cause or change rotational motion. When a DC machine is loaded either as a motor or as a generator, the rotor conductors carry current. These conductors lie in the magnetic field of

What is the Operating Principle of DC Motor? DC Motor Definition A DC motor is defined as a device that converts direct electrical energy into mechanical energy using magnetic fields and electrical currents. DC motors play a crucial role in modern industry. Understanding the working principle of a D

Controller Definition In control systems, a controller is a mechanism that seeks to minimize the difference between the actual value of a system (i.e. the process variable) and the desired value of the system (i.e. the setpoint). Controllers are a fundamental part of control engineering and used in

What is a Proportional Controller? Proportional controller is one of the most basic control algorithms in automatic control systems, usually represented by the letter "P". The proportional controller controls the response of the system by adjusting the output signal to be proportional to the error s