Deepakkumar Yadav
Working Principle of Timer The on-delay relay timer provides a change to the state of the contacts that are controlled by the energizing of the timer. The on-delay relay timer can be set or programmed to a predetermined time and this is called the preset time. Preset time can be as low as milliseconds to … Read more
Methods of Calculation of Electric Field There are different graphical, experimental and numerical field calculation methods. Special methods like method of images, conformal mapping, co-ordinate transformation are applied to simple geometrical configuration. The experimental measurement of field strength in small air gaps stressed by high voltages is a very difficult process and not quite accurate. … Read more
Fields in Multidielectric, Isotropic Materials Many insulating materials used in high voltage insulation system are formed with different layers of various insulating materials. Different materials have different permittivities. e.g. Bakelite sheets or mica sheets or materials used in transformers. The necessity of using such a material is Different layers are used to control electric stresses. … Read more
Working Principle of DC Generator An electrical generator is a machine which converts mechanical energy (or power) into electrical energy (or power). The energy conversion is based on the principle of the production of dynamically (or motionally) induced e.m.f. As seen from Figure, whenever a conductor cuts magnetic flux, dynamically induced e.m.f. is produced in … Read more
Dynamic Equations and System-model of a Simple System It is quite necessary to analyze electro-mechanical conversion system for predicting the performance and/or for monitoring the system. A simple system is being taken up here to deal with dynamic equations and a simple model with its components is being related to the system. The details will … Read more
Motor Principle An Electric motor is a machine which converts electric energy into mechanical energy. Its action is based on the principle that when a current-carrying conductor is placed in a magnetic field, it experiences a mechanical force whose direction is given by Fleming’s Left-hand Rule and whose magnitude is given by F = BIl Newton. … Read more
Electrostatic Fields and Field Stress Control In high voltage most of the problems are related with electrical conduction fields and electrostatics. Permissible field strength in the materials are interlinked with electrostatic field distributions. Knowledge of electric field and controlling field stress’s are important for following reasons. Researchers are trying to increase transmission line voltages, … Read more
Switching Surges due to External and Internal factors The above all were the protection systems against the direct lightning strokes which is purely natural and we are not having any control over it. Switching surges are the over-voltage stresses applied on the traction system, and are generally transient in nature. The surge voltage is defined … Read more
Conventional Lightning Protection System There are various conventional or principle provide protection against components to conventional lightning strokes. (A) Air Termination Network The primary function of termination network, is to arrest the an air terminal or air lightning strike to a preferred point, so as to make sure that the discharge current can be safely … Read more
Direct Lightening Strokes Basically, lightning strike is an electric discharge on a massive scale between the atmosphere and an earth bound object. Most of the lightning events are between the clouds to cloud where discharges only occur in the high atmosphere. Near about 25% of all the lightning events is ground to cloud. A lightning … Read more