Energy and Power
Dimensioning of Power Distribution Systems (1)
When the basic supply concept for the electricity supply system has been established, it is necessary to dimension the electrical power system. Dimensioning means the sizing rating of all equipment and components to be used in the power system. In… Read more
Jan 20, 2014 | By Edvard Csanyi
Electric Motor
Calculating the short-circuit current across the terminals of a synchronous generator
Calculating the short-circuit current across the terminals of a synchronous generator is very complicated because the internal impedance of the latter varies according to time. When the power gradually increases, the current reduces passing through three characteristic periods: Subtransient (enabling determination… Read more
Jan 13, 2014 | By Edvard Csanyi
Energy and Power
U.S. Renewable Energy – The Facts!
About 82% of the nation’s energy comes from fossil fuels, 8% from nuclear, and 9% from renewable sources. Wind is the fastest growing renewable source, but contributes only 1% of total energy used in the U.S. The examples below illustrate… Read more
Jan 08, 2014 | By Edvard Csanyi
Energy and Power
Driving Distributed Energy with Smart Networks
The smart network will set up a virtuous cycle for distributed generators and energy storage devices. It will grow the market by opening up more niches where distributed energy is economically competitive. This growth will lead to economies of scale… Read more
Jan 03, 2014 | By Edvard Csanyi
Energy and Power
Electrical Thumb Rules You MUST Follow (7)
Continued from: Electrical Thumb Rules You MUST Follow (Part 6) Overhead conductor / cable size Transmission / distribution line (span, height of tower) Types of towers Tower swing angle clearance (metal part to live part) Cable coding, IS 1554 (A2XFY, FRLS,… Read more
Dec 23, 2013 | By Jignesh Parmar
Energy and Power
An overview of the transmission and distribution network of New Zealand
The national grid has approximately 12,000 km of high voltage transmission lines. Most of the grid operates on alternating current (the HVAC system), although there is a direct current (HVDC) link for long distance transfer of power between Benmore in… Read more
Dec 06, 2013 | By Edvard Csanyi
Energy and Power
Electrical Thumb Rules You MUST Follow (6)
Continued from: Electrical Thumb Rules You MUST Follow (Part 5) Transformer earthing wire / Strip size Motor earthing wire / Strip size Panel earthing wire / Strip size Electrical equipment earthing Earthing wire (As per BS 7671) Area for transformer room:… Read more
Nov 29, 2013 | By Jignesh Parmar
Electrical Lectures
Important in role of capacitors in distribution systems
Should the voltage on a circuit fall below a specified level for some reason, a device called a capacitor can momentarily maintain the voltage at line value. Basically, a capacitor serves the same purpose as a storage tank in a… Read more
Nov 27, 2013 | By Edvard Csanyi
Electric Motor
Heat as one of the most common cause of motor failure
Heat is the most common cause of motor failure before reaching rated service life. Every increase of 10 degrees Centigrade of a motor’s windings above its design operating temperature cuts the life of the motor’s windings insulation by 50 percent,… Read more
Nov 22, 2013 | By Edvard Csanyi
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
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
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
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
