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Archive: Category «Energy and Power»

Electrical Lectures

Fundamental Characteristics of Circuit Breaker

The fundamental characteristics of a circuit breaker are: Its rated voltage Ue Its rated current In Its tripping current level adjustment ranges for overload protection (Ir or Irth) and for short… Read more

Jun 05, 2012 | By Edvard

Fundamental characteristics of circuit breakers
Energy and Power

Understanding Vector Group of Transformer (2)

Continued from first part Understanding Vector Group of Transformer (part 1) Vector Groups are the IEC method of categorizing the primary and secondary winding configurations of 3-phase transformers. Windings can… Read more

Jun 04, 2012 | By jiguparmar

220kV Class 110kV Class Single Phase Traction Transformer
Energy and Power

Understanding Vector Group of Transformer (Part 1)

Three phase transformer consists of three sets of primary windings, one for each phase, and three sets of secondary windings wound on the same iron core. Separate single-phase transformers can… Read more

Jun 03, 2012 | By jiguparmar

Understanding Vector Group of Transformer (Part 1)
Energy and Power

Process Design Basics for Station Facility

The purpose of this article is to establish the design basis electrical system Front End Engineering Design (FEED) and data design or standards uses in the gathering stations facility will… Read more

May 25, 2012 | By ivan.kurniawan

Process flow diagram
Energy and Power

Special considerations when selecting transformer protection

Current transformer ratio selection and performance require special attention when applying transformer protection. Unique factors associated with transformers, including its winding ratios, magnetizing inrush current, and the presence of winding… Read more

May 19, 2012 | By Edvard

Dry-type power transformers 11/0.42kV 2000kVA
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
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
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

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