Energy and Power
Electrical Thumb Rules You MUST Follow (5)
Continued from: Electrical Thumb Rules You MUST Follow (Part 4) Standard Size of Transformer (IEEE/ANSI 57.120) Standard Size of Motor (HP) Approximate RPM of Motor Motor Line Voltage Motor Starting Current Motor Starter Impedance of Transformer (As per IS 2026)… Read more
Nov 20, 2013 | By Jignesh Parmar
Electric Motor
Identity Card of Every Asynchronous Motor
A motor is characterized by different electrical and constructional parameters which identify its correct application field. The whole of all these parameters constitutes the rating of the machine and is reported on a nameplate positioned on the motor itself. Hereunder… Read more
Nov 18, 2013 | By Edvard Csanyi
Energy and Power
Electrical Thumb Rules You MUST Follow (4)
Continued from: Electrical Thumb Rules You MUST Follow (Part 3) Substation Capacity and Short Circuit Current Capacity (As per GERC) Substation Capacity and Short Circuit Current Capacity (As per Central Electricity Authority) Minimum Ground Clearance and Fault Clearing Time Busbar… Read more
Nov 15, 2013 | By Jignesh Parmar
Maintenance
Guidelines For The Construction And Maintenance Of Transmission Lines
The purpose of this article is to give a general overview of the steps that are necessary in the planning and construction of a typical overhead transmission line, to give newcomers to the trade a general format to follow, and… Read more
Nov 13, 2013 | By Edvard Csanyi
Transmission and Distribution
The Need for Load Shedding In Generating, Transmission and Distribution Systems
The need for load shedding generally arises from unforeseen causes, lack of sufficient power supply from deficiencies in generating, transmission and distribution capabilities. These conditions may stem from unusually higher than foreseen demands that may be due to the following:… Read more
Nov 11, 2013 | By Edvard Csanyi
Energy and Power
What’s the worst source of fluctuations on a power supply system?
Electric arc furnaces are considered as being one of the worst source of fluctuations on a power supply system. The load cycles of arc furnaces vary widely, depending on size and metallurgical requirements. The first part of the cycle consists… Read more
Nov 08, 2013 | By Edvard Csanyi
Electric Motor
Few Words About Stepper Motor (Advantages, Disadvantages and Classification)
A stepper motor is an electromechanical device which converts electrical pulses into discrete mechanical movements. The shaft or spindle of a stepper motor rotates in discrete step increments when electrical command pulses are applied to it in the proper sequence…. Read more
Nov 06, 2013 | By Edvard Csanyi
Energy and Power
Practical calculations of lightning strikes frequency
We distinguish between the following frequencies of lightning strikes which can be relevant for a building or structure: ND – Frequency of direct lightning strikes to the building or structure;· NM – Frequency of close lightning strikes with electromagnetic effects;… Read more
Nov 04, 2013 | By Edvard Csanyi
Electric Motor
4 motor designs identified in NEMA MG1
Performance requirements for various types of induction motors for use on standard sinewave power supplies are identified in NEMA MG1. Some of these types of motors are suitable for use in variable speed applications, dependent on the type of application…. Read more
Nov 01, 2013 | By Edvard Csanyi
Energy and Power
What’s That Hissing, Cracking, Buzzing Noise?
Corona can be visible in the form of light, typically a purple glow, as corona generally consists of micro arcs. Darkening the environment can help to visualize the corona. We once attached a camera (set to a long exposure time)… Read more
Oct 30, 2013 | By Edvard Csanyi
Medium Voltage
Field Inspection and Testing of Medium-Voltage Motor Control Centres (MCCs)
Check MCC equipment for: alignment, levelness, and tightness of all bolting. Check all equipment for: removal of blocking, supports, temporary ties, and temporary wire jumpers. Check that all protective barriers are properly installed. Check door alignment of individual starter units… Read more
Oct 28, 2013 | By Edvard Csanyi
Energy and Power
What’s important for water power designer to make the right choice of a turbine
The water power designer has to make a choice on the type of turbine that can be adopted for a particular project. After the range of head to be handled by a turbine has been evaluated by stream flow analysis… Read more
Oct 25, 2013 | By Edvard Csanyi
Testing and Commissioning
Eight important checks to do before powering up the dry-type transformer
The transformer should be powered up only after checking the following items: name plate ratings, parallel operation, connections: cables, busbars, tap change connections, grounding connection, thermal protective device, impurities removal and insulation resistance test. Make sure the name plate ratings… Read more
Oct 23, 2013 | By Edvard Csanyi
Power Substation
Dry-Type Transformer Installation and Ventilation Requirements
Dry-type transformers should be installed over foundations that are properly leveled and capable to withstand their weight. When a transformer is fitted with wheels, make sure the equipment will be equally supported on its base points in order to assure… Read more
Oct 21, 2013 | By Edvard Csanyi
Energy and Power
Natural Ventilation Of Power Substation
The operation of a system of natural ventilation is as a result of a decrease in air density as its temperature is raised due to the heat gain from various sources. This decrease in air density causes a pressure differential… Read more
Oct 18, 2013 | By Edvard Csanyi
