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Monthly Archive for: «January, 2012»

Ceramic (Porcelain and Glass) Insulators

Porcelain is the most frequently used material for insulators. Insulators are made of wet, processed porcelain. The fundamental materials used are a mixture of feldspar (35%), china clay (28%), flint (25%), ball clay (10%), and… Read more

Jan 27, 2012 | Edvard

Porcelain insulators collection

Glossary of Medium Voltage Switchgear Terms

This glossary was published originally by Schneider Electric and it is intended to cover the meaning of many common words and phrases used in association with medium voltage switchgear. Many terms will also be applicable… Read more

Jan 25, 2012 | Edvard

Anti Pumping And Lockout Relays

What is ANSI code for Antipumping relay? ANSI codes 94 or even 52 can be used. Relays can be divided into six functional categories shown below: Detect defective lines, defective apparatus, or other dangerous or… Read more

Jan 23, 2012 | Asif Eqbal

Anti-pumping relay - Powell

EHV/HV Underground Cable Sheath Earthing (part 2/2)

Continued from previous part: EHV/HV Cable Sheath Earthing (part 1/2) Link Box is electrically and mechanically one of the integral accessories of HV underground above ground cable bonding system, associated with HV XLPE power cable… Read more

Jan 21, 2012 | Edvard

21/35(40.5)KV 3-core XLPE/PVC/steel tape armor power cable

UK Electrical Industry British Standards (BS)

These standards are the whole of the prescriptions on the basis of which machines, apparatus, materials and the installations should be designed, manufactured and tested so that efficiency and function safety are ensured – and… Read more

Jan 20, 2012 | Edvard

British Standards (BSI)

EHV/HV Underground Cable Sheath Earthing (part 1/2)

In urban areas, high voltage underground cables are commonly used for the transmission and distribution of electricity. Such high voltage cables have metallic sheaths or screens surrounding the conductors, and/or armour and metallic wires surrounding… Read more

Jan 19, 2012 | jiguparmar

21/35(40.5)KV 3-core XLPE/PVC/steel tape armor power cable

Segregated Phase Bus System

In this construction all the phases are housed in one metallic enclosure as earlier, but with a metallic barrier between each phase, as illustrated in Figure 1. The metallic barriers provide the required magnetic shielding and isolate the busbars… Read more

Jan 18, 2012 | Edvard

Segregated phase bus system

How lightning really works? (video)

A lightning discharge develops in three stages: first, the collisions between ice particles and water droplets together with gravity separate positive and negative charges inside the thunder cloud and buildup a voltage. Then a discharge… Read more

Jan 17, 2012 | Edvard

Luminous Measurement Graphic Representation

The collection of luminous intensity emitted by a source of light in all directions is known asluminous distribution. The sources of light used in practice have a more or less large luminous surface, whose radiation… Read more

Jan 16, 2012 | Edvard

Goniophotometer

Synchronous Motor Construction

Synchronous motors convert electrical power to mechanical power and synchronous generators convert mechanical power to electrical power; and synchronous condensers supply only reactive power to stabilize system voltages. Synchronous motors, generators, and condensers perform similarly, except for… Read more

Jan 14, 2012 | Edvard

Synchronous Motor Construction

What Is The Potential Difference?

Potential difference is the term used to describe how large the electrostatic force is between two charged objects. If a charged body is placed between two objects with a potential difference, the charged body will try to move in one direction, depending upon the… Read more

Jan 13, 2012 | Edvard

Figure 1 - Potential Difference Between Two Charged Objects

Effective Resistance Of Busbars

The construction of busbar is usually carried out by putting together several flat bars in parallel for each phase. The spacing between the bars is made equal to their thickness for practical reasons, and this leads to skin and… Read more

Jan 12, 2012 | Edvard

System with two copper bus bars

Potential Energy Savings In Utility Buildings Using EIB

Flexibility, utilisation value and energy saving are the three main requirements for utility buildings (administration, office and public buildings, schools, hospitals, etc.). Apart from recouping investment costs, so-called life-cycle costs are also becoming increasingly important…. Read more

Jan 11, 2012 | Edvard

ABB - Intelligent building control and energy savings with i-bus ® KNX


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