Power Substation ♛

Electric Motor

Electric Motor

Protection

## The essential physics behind transformer differential protection (You MUST know)

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# Monthly Archive for: «April, 2016»

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… Read more

Apr 30, 2016 | By Edvard

Energy Efficiency

# 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 | By Edvard

Industrial Automation

# 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 | By Edvard

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… Read more

Apr 25, 2016 | By Edvard

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… Read more

Apr 23, 2016 | By Edvard

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… Read more

Apr 22, 2016 | By Edvard

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… Read more

Apr 20, 2016 | By Edvard

Electric Motor

# Two Basic Methods Used For Braking a Motor (DC Injection and Dynamic)

Two common basic methods used for braking a motor are DC injection braking and dynamic braking. We will look at both in detail, starting with electric braking. DC Injection Braking… Read more

Apr 18, 2016 | By Edvard

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… Read more

Apr 16, 2016 | By Edvard

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… Read more

Apr 15, 2016 | By Edvard

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… Read more

Apr 13, 2016 | By Edvard

Power Quality

# 5 anomalies in AC power that can damage your home devices

In addition to lightning, there are a number of other disturbances that can come in on the AC power lines and damage equipment. Some surge protectors can reduce or eliminate… Read more

Apr 11, 2016 | By Edvard

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… Read more

Apr 09, 2016 | By Edvard

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… Read more

Apr 08, 2016 | By Edvard

Energy and Power

# Power Measurement On Four-Wire System Using Wattmeter Methods

A four-wire system is suitable to supply unbalanced, three-phase loads or single phase loads distributed on all three phases of a low voltage installation. When measuring power on a three-phase… Read more

Apr 06, 2016 | By Edvard