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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

GE Watthour Meter
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

Instrument transformers - ABB
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

Clapm meter
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

Using AC and DC together in electrical system?
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

Residual current device 30mA - SIEMENS
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

Siemens SIRIUS 3RP25 timing relay with microprocessor, OFF delay without auxiliary voltage, fully cover the functionality of the predecessor types on ASIC basis
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

Fluke insulation resistance tester up to 10kV
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

Megger MIT1020 10-kV insulation resistance testers are all designed specifically to assist the user with the testing and maintenance of high voltage equipment
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

Low voltage switchgear type 'OKKEN' - Schneider Electric
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

Dirty surface of the fluoroscent lamp
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

Direct Online Motor Starter - Square D


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