Electrical Lectures
Power distribution configurations with three 3-phase hot power lines
Power leaves the substation on three, three-phase “hot” power lines that are strung adjacent to highways or along local roads to points of use. All three phases share a single neutral line and have the same voltage, but they are… Read more
Jun 01, 2016 | By Edvard Csanyi
Energy and Power
Equipment Used To Implement Automatic Transfer System (ATS)
Although the basic operational requirements of any automatic transfer system are as given in this technical article, the equipment which is used to implement the automatic transfer system can vary. The following is a list of commonly encountered variations regarding… Read more
Jun 01, 2016 | By Edvard Csanyi
Energy and Power
General Requirements For Operation and Maintenance Of Battery Cells
Primary battery cells cannot be recharged and once their energy is depleted they should be disposed off in the manner recommended by the manufacturer. The cells should be examined occasionally during their life for signs of leakage or physical deformation…. Read more
May 11, 2016 | By Edvard Csanyi
Electric Motor
A few tips on how to select contactors for use in direct on line starters
Contactors for use in direct on line starters (DOL) are normally selected by their AC3 rating, that is the switching on of a cage type induction motor and switching off the supply to the motor after the motor has run… Read more
May 09, 2016 | By Edvard Csanyi
Energy and Power
Differential protection – Proven technique for more than 50 years
The best protection technique now and for more than 50 years is that known as differential protection. Here the electrical quantities entering and leaving the protected zone or area are compared by current transformers (CTs). If the net between all… Read more
May 02, 2016 | By Edvard Csanyi
Electrical Lectures
Superposition Theorem Used To Solve The Simple Network
Using Superposition theorem, find the current through the 2Ω resistor of the network of Figure 1 above. The presence of three sources will result in three different networks to be analyzed. Considering the effect of the 12-V source (Fig. 2):… Read more
Apr 30, 2016 | By Edvard Csanyi
Energy and Power
Features of 3 circuit protection devices (MCB, RCCB and RCBO) you have probably forgotten
Traditionally, fuses were the main devices chosen for final circuit protection, up until the 1970’s when circuit breaker technology started to become dominant. Today, the three principle circuit protection devices are: Miniature Circuit Breakers (MCBs), Residual Current Circuit Breakers (RCCBs)… Read more
Apr 25, 2016 | By Edvard Csanyi
Electrical Lectures
Electric Circuits? It’s All About Nodes, Branches, and Loops
Since the elements of an electric circuit can be interconnected in several ways, we need to understand some basic concepts of network topology. To differentiate between a circuit and a network, we may regard a network as an interconnection of… Read more
Apr 23, 2016 | By Edvard Csanyi
Energy and Power
What Would Be The Worst Type Of Three Phase Faults (And Why It Happens)
In a three phase power system, the type of faults that can occur are classified by the combination of conductors or buses that are faulted together. In addition, faults may be classified as either bolted faults or faults that occur… Read more
Apr 22, 2016 | By Edvard Csanyi
Energy and Power
3 Designs of DC Distribution Systems In Power Substations
The method of connection of the battery, battery charger, and DC distribution systems depends on the duty, the type or load, and whether the system needs to be duplicated or whether duplicate chargers are required. One typical example for a… Read more
Apr 20, 2016 | By Edvard Csanyi
Energy and Power
You can use water pipes for grounding purposes, but…
Water pipes have been used extensively in the past as a grounding electrode. Water pipe connections are not testable and are unreliable due to the use of tar coatings and plastic fittings. City water departments have begun to specifically install… Read more
Apr 16, 2016 | By Edvard Csanyi
Electrical Lectures
Why do we care so much about power factor correction?
Power factor, as every electrical engineer should know, is defined as the ratio of real power to volt-amperes and is the cosine of the phase angle between the voltage and current in an AC circuit. These are neatly defined quantities with sinusoidal… Read more
Apr 15, 2016 | By Edvard Csanyi
Electrical Lectures
AC versus DC. Those were the days…
Take warning! Alternating currents are dangerous. They are fit only for powering the electric chair :) The only similarity between an AC and a DC lighting system is that they both start from the same coal pile. And thus did… Read more
Apr 13, 2016 | By Edvard Csanyi
Energy and Power
What would be the best conductor material for electrical wires and cables
The conductivity of copper is 65% higher than that of aluminium which means that the conductor size of similarly rated cables is proportionately smaller. Correspondingly less expense is then incurred in providing for insulation, shielding and armouring the cables themselves…. Read more
Apr 09, 2016 | By Edvard Csanyi
Electrical Lectures
What Is The Energy, But For Real?
Energy is best defined as “the capacity for doing work”. Electricity is but one of many forms of energy. Other familiar forms of or descriptions of energy are thermal or heat, light, mechanical, and so on. Energy is also described… Read more
Apr 08, 2016 | By Edvard Csanyi
