Deepakkumar Yadav
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
Unbalanced System A system is said to be balanced system if the impedance or phase angle or frequencies of three phase is same otherwise it is called as unbalanced system. There are two types of unbalanced systems. Those are Three phase four wire system (star connection with neutral) Three phase three wire system (Delta or … Read more
Lightning Arrester for Traction Systems 1. DC Traction Arrester2. Track Side Arrester3. AC Surge Arrester4. Low Voltage Limiter 5. Enhanced Voltage Limiter This is installed in between the current return path and the structures lying alongside to the rails, such as telecommunication, signalling and electrical equipment. In case of over voltages, enhanced voltage limiter generates … Read more
Lightning Arrester for Traction Systems 1. DC Traction Arrester It is of 10 kA rating. It is designed to be used on the DC voltage systems in the traction applications. Their function is to limit the damaging effects of large lightning derived transient overvoltage conditions. They are suitable for indoor or outdoor applications and can … Read more
Surge Protection of Traction System Q. Explain with neat sketch protection of locos against lightening surges. There is a wide expansion of the track electrification worldwide. We often forget the hidden enemy and widespread damage that comes with overvoltage power surges. The easiest ways to understand are those which are derived from the lightning strikes … Read more
Tap Changer Q. Explain the purpose of equipments in AC locomotive : Tap changer. Tap changers are of many types such as On-Load tap changers and Off-Load tap changers. In traction power circuit mainly on load tap changers are preferred. On load tap changers are capable of changing the taps quickly without interrupting the flow … Read more