High Voltage ♛

Transformers

Transformers

Electric Motor

## Basics of 3-phase Induction Motor (part 1)

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# Technical Articles

Electrical Lectures

# Power Measurement In AC Circuits

Power measurement in AC circuits can be quite a bit more complex than with DC circuits for the simple reason that phase shift complicates the matter beyond multiplying voltage by current… Read more

May 15, 2012 | By Edvard

Energy and Power

# Introduction to instrument transformers

Instrument transformers (ITs) are designed to transform voltage of current from the high values in the transmission and distribution systems to the low values that can be utilized by low… Read more

May 14, 2012 | By Edvard

Cables

# Sizing of power cables for circuit breaker controlled feeders (part 2)

Continued from article Sizing of power cables for circuit breaker controlled feeders (part 1) This criterion is applied so that cross section of the cable can carry the required load… Read more

May 13, 2012 | By Asif Eqbal

Cables

# Sizing of power cables for circuit breaker controlled feeders (part 1)

The following three criteria apply for the sizing of cables for circuit breaker controlled feeders: [fancy_header]I. Short circuit current withstand capacity[/fancy_header] This criteria is applied to determine the minimum cross… Read more

May 10, 2012 | By Asif Eqbal

Energy and Power

# Overvoltages Caused by Indirect Lightning Strokes

A direct stroke is defined as a lightning stroke when it hits a shield wire, a tower, or a phase conductor. An insulator string is stressed by very high voltages… Read more

May 08, 2012 | By Edvard

Metering

# An Overview Of Clamp Meter

Clamp-on ammeter or simply ‘clamp meter’ is an instrument that is used to measure the current flowing through a conductor. An AC Clamp meter basically consists of a current transformer… Read more

May 06, 2012 | By S

Medium Voltage

# Bus Switching Configurations In Air Insulated Substations (AIS)

Various factors affect the reliability of a substation, one of which is the arrangement of the switching devices. Arrangement of the switching devices will impact maintenance, protection, initial substation development,… Read more

May 05, 2012 | By Edvard

Energy and Power

# Using AC and DC together in electrical system?

There are a number of issues to using AC and DC together in the same electrical system. Briefly, they are: circuit boxes and hardware, outlets, wiring schemes and sizes, and switches. The Electrical… Read more

May 05, 2012 | By Edvard

Energy and Power

# Types of Residual Current Devices (RCD)

For domestic applications only the first five of the below listed residual current devices (RCD) need to be considered. For industrial and commercial buildings all of the classifications need to… Read more

May 03, 2012 | By Edvard

Energy and Power

# Time relays setting ranges explained in details

Time relays are used in control switching operations involving time delay. Most of these time relays have multiple time setting ranges and most of them are explained below. Time relays… Read more

Apr 30, 2012 | By Edvard

Maintenance

# Measurement of insulation resistance (IR) – 2

Continued from first part: Measurement of insulation resistance (IR) – Part 1 1. IR Values For Electrical Apparatus & Systems 2. IR Value for Transformer 3. IR Value for Tap Changer… Read more

Apr 29, 2012 | By jiguparmar

Cables

# Measurement of insulation resistance (IR)

The measurement of insulation resistance is a common routine test performed on all types of electrical wires and cables. As a production test, this test is often used as a… Read more

Apr 28, 2012 | By jiguparmar

Energy and Power

# Overview Of Electrical Loads In Building

The electrical design professional should determine a building’s electrical load characteristics early in the preliminary design stage of the building to select the proper power distribution system and equipment having… Read more

Apr 27, 2012 | By Edvard

Lighting

# Light Emission Depreciation

Illuminance provided initially by a lighting installation will decrease in a gradual way during its use due to a reduction in lamp lumens, to lamps which burn down, and to… Read more

Apr 24, 2012 | By Edvard

Electric Motor

# Direct On Line (DOL) Motor Starter

Different starting methods are employed for starting induction motors because Induction Motor draws more starting current during starting. To prevent damage to the windings due to the high starting current… Read more

Apr 22, 2012 | By jiguparmar

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