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Protection

## Primary injection testing of protection system for wiring errors between VTs / CTs and relays

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Energy and Power

# How to manage harmonic currents affecting the neutral

A number of measures can be taken to eliminate or reduce the effects of harmonic currents in the neutral conductor, in particular third harmonic currents. Let’s talk about the following… Read more

Mar 25, 2016 | By Edvard

Electrical Lectures

# Reactive Power and Compensation Solution Basics For Students

The total power, the so-called apparent power, of a transmission network is composed of active and reactive power (Figure 1). While the power consumers connected into supply transform the active… Read more

Feb 17, 2016 | By Edvard

Energy and Power

# Harmonics. What are they? What do they do?

The harmonics allow to represent any periodic waveform. In fact, according to Fourier’s theorem, any periodic function of a period T may be represented as a summation of: A sinusoid with… Read more

Jan 27, 2016 | By Edvard

Energy and Power

# How to identify these four parameters and lower facility’s electricity bill

The world is more energy conscious these days. But unlike you, most of the world doesn’t pay electricity bill that rivals the cost of a four bedroom home. You understand… Read more

Jan 13, 2016 | By Edvard

Energy and Power

# Smart Ways To Cut Down The Influence Of Harmonics

There are three possible ways of suppressing or at least reducing the influence of harmonics. The fourth way is a special case. Contents: Reducing generated harmonic currents Modifying the installation… Read more

Dec 28, 2015 | By Edvard

Energy and Power

# Few things that capacitors do perfectly

Capacitors provide tremendous benefits to distribution system performance. Most noticeably, capacitors reduce losses, free up capacity, and reduce voltage drop. Let’s go a little bit into details. By canceling the… Read more

Oct 05, 2015 | By Edvard

Energy and Power

# Acceptable levels of distortion in the mains supply system

In the mains supply system, harmonic voltage distortion is the consequence of the flow of harmonic currents through the impedances in the power supply circuit connected to the converter. A… Read more

Sep 26, 2015 | By Edvard

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… Read more

Aug 07, 2015 | By Edvard

Electrical Lectures

# Essential Basics of Total Harmonic Distortion (THD)

For a signal y, the total harmonic distortion (THD) is defined by the equation: This definition complies with that of standard IEC 61000-2-2. Note that the resulting value may exceed… Read more

Jul 22, 2015 | By Edvard

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… Read more

Jun 05, 2015 | By Edvard

Energy and Power

# 5 Types of equipment which generates the most harmonics

Harmonic load currents are generated by all non-linear loads. This includes: Switched mode power supplies (SMPS) Electronic fluorescent lighting ballasts Variable speed drives (VSDs) Uninterruptible power supplies (UPS) Magnetic-cored devices… Read more

Apr 27, 2015 | By Edvard

Energy and Power

# Detailed Overview of Power System Disturbances (Causes and Impacts)

To make the study of Power Quality problems useful, the various types of disturbances need to be classified by magnitude and duration. This is especially important for manufacturers and users of… Read more

Apr 17, 2015 | By Edvard

Electronics

# Should We Blame Supplier For Voltage Dips and Transients?

Voltage dips and transients are usually blamed on the supplier, but this is often unfair. There are many potential on-site causes; for example, starting of heavy loads may cause voltage… Read more

Mar 11, 2015 | By Edvard

Energy and Power

# Why it’s important to know which type of power factor correction to use

It’s important to understand where the capacitors are to be installed for a better exploitation of such advantages. There are no general rules applicable to every type of installation and, in… Read more

Mar 09, 2015 | By Edvard

Energy and Power

# 9 Recommended Practices for Grounding

Grounding and bonding are the basis upon which safety and power quality are built. The grounding system provides a low-impedance path for fault current and limits the voltage rise on… Read more

Mar 06, 2015 | By Edvard

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