Electric Motor
What is the rewind scenario if a motor fails?
Unlike an initial motor purchase where your decision is limited to procuring a standard versus a premium efficiency motor, a motor failure or burnout produces three alternatives. Your options are to rewind the failed motor, purchase a new standard-efficiency motor,… Read more
Jul 10, 2013 | By Edvard Csanyi
Electrical Lectures
Development of a Sine-Wave Output In AC Generator
The elementary AC generator (Figure 1) consists of a conductor, or loop of wire in a magnetic field that is produced by an electromagnet. The two ends of the loop are connected to slip rings, and they are in contact with two… Read more
Jul 08, 2013 | By Edvard Csanyi
Electric Motor
Keeping Motor At Correct Temperature When Connected To a Frequency Converter
When a motor is connected to a frequency converter it must be kept at the correct temperature, and this is subject to two types of influence: If the speed decreases, the cooling air volume goes down. If a non-sinusoidal motor… Read more
Jul 05, 2013 | By Edvard Csanyi
Energy and Power
A Few Words About Battery Hazards and Why They Happen
Because batteries store large amounts of energy, there are certain hazards that are associated with battery operation. These hazards must be fully understood to ensure safe operation of batteries. Cell short circuits can be caused by several conditions, which include… Read more
Jul 03, 2013 | By Edvard Csanyi
Transmission and Distribution
Voltage Distribution In a Suspension Insulator Strain
A suspension insulator strain consists of a series of alternately insulators and metal parts, which bind each insulator to the next. This constitutes a series of connected capacitors, with each one’s capacitance being created by two successive metal connectors (clips)… Read more
Jul 01, 2013 | By Emmanouil Angeladas
Energy and Power
Surge protective categories defined by ANSI/IEEE C62.41
Three different surge protective classes or zones have been defined by ANSI/IEEE C62.41, Recommended Practice on Surge Voltages in Low Voltage Power Circuits. These classes are illustrated in the pictorial diagram Fig. 12-1. Category C (outdoors) is the region outside the… Read more
Jun 28, 2013 | By Edvard Csanyi
Energy and Power
Thinking About Security Considerations in SCADA Systems (2)
Continued from previous part: Thinking About Security Considerations in SCADA Systems (1) In this part of technical article, I will focus on various types of threats which must be considered in order to plan the security management of a SCADA… Read more
Jun 26, 2013 | By Bipul Raman
Energy and Power
Thinking About Security Considerations in SCADA Systems (1)
SCADA System can be affected by a number of threats, which may be natural or intentional. So it is very much important to focus on security aspects of SCADA Systems. In this article, I will focus on various types of threats… Read more
Jun 24, 2013 | By Bipul Raman
Electric Motor
Mysterious synchronous operation of generator solved
To many people, the operation of a synchronous generator is very mysterious and strange. Here is this huge machine which runs are a constant speed whether the 4 – 24 inch steam valves are wide open or shut tightly the machine speed is… Read more
Jun 21, 2013 | By Edvard Csanyi
Energy and Power
An Introduction To SCADA For Electrical Engineers – Beginners
It is impossible to keep control and supervision on all industrial activities manually. Some automated tool is required which can control, supervise, collect data, analyses data and generate reports. A unique solution is introduced to meet all this demand is… Read more
Jun 19, 2013 | By Bipul Raman
Transmission and Distribution
Overhead Transmission Lines – Static Mechanical Support
When designing an overhead transmission line, we should pay attention to ensure that the tension force does not exceed, in any case, the limit of the mechanical strength of the conductor. The maximum stress occurs at the lower temperature,when the… Read more
Jun 17, 2013 | By Emmanouil Angeladas
Electric Motor
Few Words About Capacitor-Start (CS) Motors
The capacitor-start (CS), or more precisely, capacitor-start, induction-run motor, is a modified split-phase induction motor used for hard-to-start loads. CS motors are efficient and require starting currents about 5 times their full-load currents. The schematic Figure 1 shows that the… Read more
Jun 14, 2013 | By Edvard Csanyi
Electric Motor
Split-phase motors for medium-duty applications
The split-phase (SP), or more accurately, the resistance-start, split-phase, induction run motor,is recommended for medium-duty applications. It can run at constant speed even under varying load conditions where moderate torque is acceptable. Split-phase motors have squirrel-cage rotors and both a main or… Read more
Jun 12, 2013 | By Edvard Csanyi
Energy and Power
How to calculate voltage regulation of distribution line
Introduction to voltage regulation Voltage Regulation for 11KV, 22KV, 33KV Overhead Line Permissible Voltage Regulation (As per REC) Voltage Regulation Values Required Size of Capacitor Optimum location of capacitors Voltage Rise due to Capacitor installation Calculate % Voltage Regulation of… Read more
Jun 10, 2013 | By Jignesh Parmar
Energy and Power
Impacts of Voltage Dips on Power Quality Problems
Figure 1 shows the profile of a voltage dip, together with the associated definitions. The major cause of voltage dips on a supply system is a fault on the system, that is sufficiently remote electrically that a voltage interruption does… Read more
Jun 07, 2013 | By Edvard Csanyi
