Plant Design: Motor Protection Parameters

The table below is an example of a working protection parameters of an electrical system. A parameter sheet such as this will enable the designer to tabulate necessary initial values and  calculations. NO. Equipment name Nominal power (kW) Circuit calculation current(A) CT trans. ratio Zero sequence CT trans. ratio Circuit type 1 Motor...

Generator excitation control operation

Increasing the output voltage of a generator is achieved by adjusting the magnitude of the excitation current. This happens because as DC current is increased, the rotating magnetic field increases thereby increasing the generator  voltage induced in the stator conductor.     As the...

EEWeb Website of the Day April 2, 2012

This blog is featured in EEWeb - Electrical Engineering Community, as website of the day for April 2, 2012. This is an excellent recognition from a popular electrical engineering community website for hardware engineers. I'm happy and honored that this blog was on the front page of the EEweb ...

Electronic Control of automatic Recloser

Electronic Recloser Contol is compromised of a number of programmable, solid solid-state electronic circuits that perform the command fuctions involved in automatic recloser operation. It is used to operate all electronically controlled reclosers. the control panel of the control unit contains the...

Automatic Circuit Recloser

Recloser is a device that is used in over head distribution systems to interrupt the circuit to clear faults. Automatic reclosers have its electronic control senses and vacuum interrupters that automatically recloses to restore service  if a fault is temporary. There are several attempts...

AC Circuit Phase Sequence

Phase sequence is the order in which the generated voltages in the phase winding of an alternator reach or  attain  their peak or maximum values. It is represented by the letters a, b, and c or the numbers 1, 2, 3 or by using double letter as ab, bc  and ca or  an, bn  and...

Balanced Three phase AC circuit Delta connected

A balanced three phase AC circuit systems is energized by three equal alternating emf's of the same frequency but 120 degree apart. The phase impedance are equal. Also the currents are equal and 120 degree apart. Three AC emf's differing in time phase by 120 degree DELTA (MESH) CONNECTED SYSTEM This...

Electronics :Traffic light Circuit

This is a two way continuous traffic light circuit which uses  LED, diodes and IC's .  Usually most traffic light in the world is PLC controlled but this circuit is  simple  and easy to build .   In the image below is the schematic diagram of the project ....

RLC parallel circuit formula and Phasor diagram

RLC in parallel RCL parallel circuit can be considered as two reactance's XC and XL where the currents are in phase opposition in parallel with the resistor. Through the use of  the phasor diagram the effective total resistance can be found  . It can be observed that IR is at the base...

Parallel RC circuit formula and phasor diagram

RC circuit in parallel formula and diagram Currents in IR and IC are 90 degree out of phase and cannot be added directly. The total current or resultant will depend upon the resistance and R and the reactance ( AC reactance) of AC Parallel RC circuit Phasor diagram : As the reactance...

Parallel RL circuits formula and Phasor diagram explanation

Parallel  RL circuit formula and diagram The current through L will lag  IR  by 90 degrees . The resultant negative phase angle  depends upon the relative values of R and XL. for R, E and R in phase . For  XL , E and IL in quadratic lagging current. As  the...

Series RLC circuit formula explanation

Series RLC circuit diagram and formula Resistance ,inductance capacitance in series    In RLC series circuit , the series current is common for Resistance, Capacitance and inductance . VR will be in phase width I. Whereas the voltage of Vc and VL will be 180 degree...

The formula for Series RC circuit with Phasor Diagram

Series RC circuit formula explanation  R- the resistance -opposition to current flow (ohms)Ω C- capacitance-opposition to any change in voltage ,farad(f)  VR=IR- voltage drop of the resistor Vc= q/c=∫idt/c- voltage drop in the capacitor           ...

Analyze the formula for Series RL circuit and its Phasor Diagram

   Series RL circuit R- the resistance -opposition to current flow (ohms)Ω L- Inductance -opposition to any change   XL- inductive resistance VR=I R volts VL=I XL volts XL = inductance reactance  (ohms) Ω       = 2πfL= ωL Voltage developed...

Power in parallel Circuits

Power dissipated by each individual resistance is simply added to find the total power dissipated by the series circuit. This same procedure also applies to parallel circuits. If there are five resistive branches in a parallel circuit and each was dissipated 1 watt of power, the total power...

Series and parallel resistance circuit :explanation

The familiarity of the few circuit building blocks is important in  understanding complex circuits. In this post I will explain the most important ideas in  DC circuits. From my previous posts I discussed about the Ohms law . This is a continuation of the post about  simple direct...