Tricky but Easy Electrical Engineering!
There are mainly two types of transformer from core construction point of view: Core Type Transformer and Shell Type Transformer. A transformer can be classified into various types based on core construction, winding design, application, cooling medium and power supply to which it is connected. . In core type, transformer HV and LV windings are wound on both … Read more
Definition of Transformer: Transformer is a device which transfers electrical energy from one circuit to another through the medium of magnetic field and without change in the frequency. The electrical circuit which receives electrical power from the source is called the primary winding and another circuit which delivers the electric energy to load is called … Read more
Rotor resistance control is one among the various methods for the speed control of induction motor. In this method of speed control, the rotor circuit resistance is varied by connecting a variable external resistance. This method is only applicable for slip ring or wound rotor induction motor (WRIM). As in squirrel cage induction motor (SCIM), … Read more
Pole changing method is a speed control scheme of induction motor. In this scheme, the number of pole pairs is changed by changing the field connection. In induction motor, field winding is wound on the stator while the armature winding is wound on the rotor. Therefore in this scheme, provision for changing the stator winding … Read more
Grading capacitor is used in EHV circuit breakers for achieving uniform voltage distribution across the contacts of multi-break circuit breaker. Multi-break circuit breaker here means that a single breaker having more than once interrupter unit. These capacitors are connected in parallel with each of the interrupter unit. In this post, we will discuss the effect … Read more
Before going into the phasor diagram of transformer, there are some important points which must be kept in mind. Based on these points, we will draw the phasor diagram for No Load, Lagging Load and Leading Load condition of transformer. Important Points for Phasor Diagram of Transformer: 1) Transformer when excited at no load, only … Read more
Definition: Triplen harmonics are the odd integral multiple of third harmonic wave. If the frequency of third harmonic wave is ω then frequency of triplen harmonic wave will be 3nω, where n = 3,5,9,…These waves posses a special characteristics and hence it becomes important for the study and analysis of power system. The amazing property … Read more
There are mainly two types of induction motor on the basis of power supply, Single Phase Induction Motor and Three Phase Induction Motor. As their name suggests, 1 phase AC power supply is extended to single phase induction motor while three phase induction motor is connected to 3 phase AC power supply. Types of Single … Read more
Low power factor has several disadvantages in power system. The main effect of low power factor is to increase the current and hence increase losses. This reduces overall system efficiency. Low power factor is thus not desirable from economic point of view. Let us first understand the basic cause for low power factor. We know … Read more
Effect of Poor Power Factor: The major effect of poor power factor is higher value of line current. We know that power factor (pf) is an important parameter for calculation of power in an AC circuit. For a given power and voltage, the current flowing through the line is inversely proportional to the power factor. … Read more