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
Industrial Automation
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
Transformers
Glossary of Power Transformer Terms
There are many terms associated with power and distributive transformers used in electrical networks. These are just some of the most important. Feel free to add any of missing terms in the comment below ;) An Ansi (American National Standard… Read more
Jun 05, 2013 | By Edvard Csanyi
Energy and Power
Transformer temperature, oil level and pressure gauges
Temperature controls are required in order to turn on and off the cooling equipment. These controls are usually combined with a visible dial-type gauge that measures ‘winding temperature’. This is really a misnomer because the gauge does not actually contact… Read more
Jun 03, 2013 | By Edvard Csanyi
High Voltage
High voltage testing – Direct current (DC)
DC tests are used mainly to do “pressure tests” on high voltage cables. Although the cables operate with AC, AC testing is not practical. The high capacitance of the cables necessitates AC test sets with a high kVA rating to… Read more
Jun 01, 2013 | By Edvard Csanyi
