Energy and Power
What parallel redundancy does to the power distribution system?
Redundancy is a useful method of increasing reliability and optimising the balance between operation effectiveness and expenditure. In the context of reliability, redundancy signifies that a system will continue to function satisfactorily in spite of the failure of some of… Read more
Aug 07, 2015 | By Edvard Csanyi
Energy and Power
13 Basic expressions often used in electrical testing
This is the simple list of basic terms you can often hear when testing and measurements of electrical installation (in general) is being performed. While experienced electrical engineers will find this list short, I hope beginners will catch the essence… Read more
Jul 27, 2015 | By Edvard Csanyi
Energy and Power
Two Circuit-Breaker Types For Automatic Disconnection Of the Supply
The Standard IEC 60364 prescribes automatic disconnection of the supply for protection against indirect contact. The protective device shall automatically disconnect the supply so that, in the event of a fault between a live part and an exposed-conductive-part or a… Read more
Jul 20, 2015 | By Edvard Csanyi
Electric Motor
Comparision of Direct-on-line (DOL) and Star-delta Motor Starting
The primary challenge in starting induction motors of large or medium size is predominantly due to the necessity for a high starting current when employing direct-on-line (DOL) starting method. Consider that the distribution line comes from a substation, where the… Read more
Jul 17, 2015 | By Edvard Csanyi
Cables
Differences in size and weight of equipment using copper and aluminium conductors
It is a common misconception that electrical equipment built using aluminum conductors will always be larger than the same equipment using copper conductors. While the actual conductor within the equipment will be larger with aluminum, many times the enclosure for… Read more
Jul 13, 2015 | By Edvard Csanyi
Energy and Power
MV Metal-Enclosed Switchgear and Loss of Service Continuity (LSC) Categories
Some parts of a switchgear may be made accessible for the user, for various reasons from operation to maintenance, and such an access could impair the overall operation of the switchgear then decreasing the availability. The IEC 62271-200 proposes user-oriented… Read more
Jul 10, 2015 | By Edvard Csanyi
Electrical Lectures
4 Main Means For The Generation Of Reactive Power
The four main means for the generation of reactive power are: synchronous alternators, synchronous compensators (SC), static var compensators (SVC) and banks of static capacitors. Contents Synchronous alternators Synchronous compensators (SC) Static var compensators (SVC) and Banks of static capacitors… Read more
Jun 29, 2015 | By Edvard Csanyi
Energy and Power
Take into account these losses when purchasing power transformer
Losses and purchase price should be considered when deciding which transformer to purchase. The purpose of this technical article is to present a uniform approach that can be used to determine the dollar value of these losses over the life of the transformer…. Read more
Jun 26, 2015 | By Edvard Csanyi
Energy and Power
Example for Coordination of Cascaded Circuit Breakers
A 440 V 60 Hz switchboard feeds a 4-wire distribution board for small loads such as socket outlets. The switchboard has a fault making capacity of 100kA rms. After applying diversity factors to the loads the total load current is… Read more
Jun 24, 2015 | By Edvard Csanyi
Electric Motor
Calculation of motor starting time as first approximation
The problems connected to motor starting operations are fundamentally linked to the type of motor which a determined motor operational torque “CM” offers, to the starting modality and to the connected load which has a determined load torque “C ”. The… Read more
Jun 22, 2015 | By Edvard Csanyi
Energy and Power
5 copper busbar jointing methods you should know
Efficient joints in copper busbar conductors can be made very simply by: Bolting Clamping Riveting Soldering Welding Bolting and clamping are used extensively on-site. Shaped busbars may be prefabricated by using friction stir welding. Bolted joints are formed by overlapping… Read more
Jun 17, 2015 | By Edvard Csanyi
Energy and Power
When To Use a Solidly Grounded System?
As is evident from the name, a solidly grounded system is one where the neutral of the system is directly connected to ground without introducing any intentional resistance in the ground circuit. With appropriate choice of the type and number… Read more
Jun 10, 2015 | By Edvard Csanyi
Energy and Power
How to achieve selective coordination of circuit breakers
Selective coordination is often referred to simply as coordination. Coordination is defined in NEC® 240.2 as: “The proper localization of a fault condition to restrict outages to the equipment affected, accomplished by the choice of selective fault-protective devices.” It is… Read more
Jun 08, 2015 | By Edvard Csanyi
Energy and Power
What Is The Poor Power Quality?
Most electrical and electronic equipment is designed to operate from a power supply with a particular specification that usually defines the minimum and maximum limits for RMS (root mean-square) voltage and frequency. There is an expectation on the part of… Read more
Jun 05, 2015 | By Edvard Csanyi
Energy and Power
Understanding Transfer Switch Transition Types
Transfer switches are used for quickly and safely transitioning all electrical power consumed by the circuit, equipment, or systems connected to the transfer switch output between those normal and emergency power sources. All electrical power consumed by the circuit, equipment, or… Read more
Jun 03, 2015 | By Edvard Csanyi
