Using AC switchgear in DC applications
Switchgear designed for alternating current can carry at least the same rated continuous operational DC current. With direct current the skin effect in the circuits disappears and none of the… Read more
Apr 19, 2013 | By Edvard Csanyi
What happened to forgotten papers of Nikola Tesla?
After Nikola Tesla died, there was a scramble by the United States government to find all of his papers, notes and research before other foreign powers could find them. Tesla’s… Read more
Apr 15, 2013 | By Edvard Csanyi
Why we find wind energy delivery factor important?
The key economic performance measure of a power plant is the electrical energy it delivers over the year. Not all power produced is delivered to the paying customers. A fraction… Read more
Apr 13, 2013 | By Edvard Csanyi
Grounding systems and their 3-letter classification
Low voltage systems supplying to consumer premises are predominantly solidly grounded. Protective ground connection to consumer premises (or extending the supply system ground to consumer premises) is however done in different… Read more
Apr 12, 2013 | By Edvard Csanyi
An overview of GFCI – Ground-fault circuit interrupter
The NEC requires that Ground-Fault Circuit Interrupters (GFCIs) be installed in many different rooms and locations in both public and private buildings. They are now required in bathrooms, kitchens, appliance… Read more
Apr 10, 2013 | By Edvard Csanyi
Detecting Cyber Intrusion in SCADA System
One of the axioms of cyber security is that although it is extremely important to try to prevent intrusions into one’s systems and databases, it is essential that intrusions be… Read more
Apr 06, 2013 | By Edvard Csanyi
How to Determine Correct Number of Earthing Electrodes (Strips, Plates and Pipes) – part 1
Number of Earthing Electrode and Earthing Resistance depends on the resistivity of soil and time for fault current to pass through (1 sec or 3 sec). If we divide the… Read more
Apr 05, 2013 | By jiguparmar
Preparing to synchronize a generator to the grid
In order to synchronize a generator to the grid, four conditions must be met: Phase Sequence Voltage Magnitude Frequency Phase Angle The phase sequence (or phase rotation) of the three… Read more
Mar 27, 2013 | By Edvard Csanyi
Lightning Protection System – Germany Regulations
The purpose of a lightning protection system is to protect buildings from direct lightning strikes and possible fire, or from the consequences of the load-independent active lightning current (non-igniting flash… Read more
Mar 22, 2013 | By Edvard Csanyi
The Rheostat In Few Simple Words
A variable resistor can be made from a wirewound element, rather than a solid strip of material. This is called a rheostat. A rheostat can have either a rotary control… Read more
Mar 20, 2013 | By Edvard Csanyi
Sources and Contributors To Short Circuit Current
Every electrical system confines electric current flow to selected paths by surrounding the conductors with insulators of various types. Short circuit current is the flow of electrical energy that results… Read more
Mar 15, 2013 | By Edvard Csanyi
Working principle of thermal motor protection relay
Thermal motor protection relays contain three bimetal strips together with a trip mechanism in a housing made of insulating material. The bimetal strips are heated by the motor current, causing… Read more
Mar 09, 2013 | By Edvard Csanyi
An Overview Of Short Circuit Current (part 3)
Fault calculations are carried out to find the magnitude of fault current at various voltage levels of electrical system. One of the key components in the calculation process is to determine… Read more
Mar 08, 2013 | By Asif Eqbal
Super Capacitors – Different Than Others (part 2)
Continued from first part: Super Capacitors – Different Then Others (part 1) Equivalent circuit How to measure the capacitance? Charge Method Discharge Method Measure Capacitance Capacitor types Advantages of the… Read more
Mar 01, 2013 | By sravankumarpadala
An Overview Of Short Circuit Current (part 2)
Continued from previous technical article: An Overview Of Short Circuit Current (part 1) Sub transient reactance Xd” is the apparent reactance of the stator winding at the instant short circuit… Read more
Feb 27, 2013 | By Asif Eqbal