Electrical4U 
Type I and Type II superconductors are two magnetic classes of materials that conduct electricity with vanishing DC resistance below a critical temperature, based on the properties of Superconductors. The split is not the same as low-temperature versus high-temperature superconductors.(1) Type – I Superconductors: a single critical field and a full Meissner state. Most elemental … Read more
A synchronous condenser is an over-excited synchronous motor that runs with no shaft load. Like a capacitor bank, it raises a poor power factor on a power system. The VAR output can be varied smoothly.The over-excited machine draws a leading current from the source. That leading current offsets lagging load current. In a three-phase network … Read more
The characteristics of a Zener diode are its forward and reverse current-voltage curves, especially the reverse knee. Ordinary diodes mainly conduct when forward biased, with a small voltage drop. In reverse they pass only a tiny current until breakdown voltage. Uncontrolled breakdown can destroy a rectifier. The Zener diode is rated to run in reverse … Read more
When we apply a three-phase supply to a three-phase distributed winding of a rotating machine, a rotating magnetic field is produced which rotates in synchronous speed. A rotating magnetic field is the constant-magnitude flux wave that travels around a three-phase stator. Picture the stator of an electric motor with the three-phase winding placed so each … Read more
Low power factor operation of an induction motor is the usual light-load and no-load condition. Induction Motors need magnetic fields to work, so they draw magnetizing current from the source. That current sets up flux in the air gap, often about 20% to 60% of full-load current and more on small machines. Magnetizing current does … Read more
Core and Windings of Three Phase Core Type Transformer There are different types of windings used for different kinds of applications and arrangements. Windings are the conductors wrapped as helical, disc, cylindrical or crossover coils. Those turns produce ampere-turns. The core carries flux to the other winding so the two sides have different voltages. Mainly … Read more
An electrical grid system is the network that moves power from generating stations to substations and then toward customers. Several stations are tied together on transmission lines, often at more than one voltage. The “network topology” can be a ring, a mesh or radial feeders. Choice depends on load, generation, money and reliability. Land and … Read more
An electrolytic capacitor is a capacitor that uses an electrolyte to reach a high capacitance in a small volume. Aluminium types often span about 1uF to 50mF; tantalum and polymer parts use other bands. An electrolyte is a solution with a high concentration of ions. Aluminium, tantalum and niobium electrolytic capacitors are the three main … Read more
An electrostatic precipitator is a flue-gas cleaner that charges dust and ash, then pulls those particles onto collecting plates. Coal-fired furnaces send a lot of fly ash with the gas. The precipitator sits in that duct so most of the ash never reaches the stack. If that gas left the chimney uncleaned, the ash would … Read more
Advantages of Induction Motor Disadvantages of Induction Motor