Power System Protection
In a power system protection, faults can occur in any components like generators, transformers, buses or transmission lines and so
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Electrical Engineering
Factor Affecting Transient Stability
It has been seen that transient stability is greatly affected by the type and location of a fault, so that
Read MoreFault Subsequent Clearance by Circuit Breaker
Let us consider a single machine tied to infinite bus through two parallel lines as shown below in figure. Let
Read MoreConcept of Critical Clearing Angle and Critical Clearing Time
Let the system of figure shown above be operating with mechanical input Pm at a steady angle of δ0(Pm =
Read MoreEqual Area Criteria
For single machine system and infinite bus-bars a method known as “equal area criterion of stability” is employed. This method
Read MoreSystem Stability Concepts
Different Forms of Stability For the purpose of analysis there are mainly three stability conditions which are namely 1. Steady
Read MoreShort Circuit of a Synchronous Machine (On No-Load)
When a fault occurs in a power system network, the current flowing is determined by the internal emfs of the
Read MoreFault Calculations
Whenever there is insulation failure of equipment in a power system or flashover of the lines initiated by a lightning
Read MoreFormation of YBUS Matrix
YBUS can be formed using two methods namely. Direct inspection method Singular transformation method 1. Direct Inspection Method Let us
Read MoreProperties of A ZBUS Matrix
(i) ZBUS can be obtained as inverse of YBUS given by (ii) In ZBUS matrix, the diagonal elements are short
Read MoreImpedance and Admittance Matrices
Formulation of Nodal Admittance Matrix Power system network can be analysed using either mesh current method or nodal voltage method.
Read MorePower Generation
INTRODUCTION Electrical energy is generated by conversion of energy available in different forms from different natural sources such as pressure
Read MoreTYPES OF STEPPER MOTORS
Variable-Reluctance Stepper Motors A variable-reluctance stepper motor consists of a single or several stacks of stators and rotors. Stators have
Read MoreSTEPPER MOTORS
The stepper motor is a special type of synchronous motor which is designed to rotate through a specific angle called
Read MoreTWO-PHASE SERVOMOTOR
SERVOMOTOR For a low-power (~300 W) control application, 2-phase balanced servomotor driven by ac amplifier is used in control applications.
Read MoreDifference between Induction Motor and Transformer
Induction Motor Vs Transformer Transformer Induction Motor (i) Electrical to electrical conversion through high permeability core. (i) Electrical to mechanical
Read MoreExcitation Systems for Synchronous Machines
Definition :- The system which provides DC to the synchronous machine field winding to perform protective and control function of
Read MoreDC Machine Construction
A DC machine has two main parts stator and rotor. The stator of the machine does not move, i.e., stationary
Read MoreTypes of Transformers
Generally, there are two types of transformers, the core type and shell type. In core type the windings surround a
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