# 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… Read more

May 11, 2016 | Energy and Power

# 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… Read more

May 09, 2016 | Electric Motor

# Every car has it – The Lundell generator with claw-pole rotor

Increasing comfort and safety in cars, trucks, and buses driven by combustion engines require more installed electric power on board. As of now, the Lundell generator (claw-pole rotor generator) is the… Read more

May 06, 2016 | Electric Motor

# Does transformer hum make you nervous? It does me.

Noise is caused by magnetostricition (changes in shape) of the core laminations while the transformer is energized. Transformers emit a low-frequency, tonal noise that people living in their vicinity experience… Read more

May 04, 2016 | Power Substation

# 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… Read more

May 02, 2016 | Energy and Power

# 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… Read more

Apr 30, 2016 | Electrical Lectures

# How To Reduce Transformer Losses At Design Stage

Design changes to reduce transformer losses, just as in a motor, always involve trade offs. For example, consider varying the cross-sectional area of the transformer core. An increase tends to… Read more

Apr 29, 2016 | Energy Efficency

# Purpose And Applicable Processes Of a SCADA System

SCADA is the technology that enables a user to collect data from one or more distant facilities and to send limited control instructions to those facilities. It’s important to note… Read more

Apr 27, 2016 | Industrial Automation

# 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… Read more

Apr 25, 2016 | Energy and Power

# 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… Read more

Apr 23, 2016 | Electrical Lectures