Search

Premium Membership

Learn about power engineering and HV/MV/LV substation design. Study specialized technical articles, papers & video courses. Apply 15% off code on Pro plan: ZX21F

Monthly Archive for: «August, 2011»

Protection

Bus protection – Overcurrent differential

When selecting relays for bus protection, a major concern is the ability of the protective relaying scheme to restrain from tripping for close-in line faults. Tripping for bus faults, the… Read more

Aug 31, 2011 | By Edvard

Energy and Power

Surge arrester types and auxiliary equipment

Nearly 100 years ago, electrode gaps (rod, sphere, or pipe) were used to limit overvoltages on equipment (Sakshaug, 1991). Some of these systems, particularly pipe gaps, may still be in… Read more

Aug 25, 2011 | By Edvard

Lightning arrestors being installed at Kingston sub-station in 1928. Photo: ACTEA.
Energy and Power

How to save electrical energy at home

In our home we use lot of electrical equipment like TV, Freeze, Washing machine, Mp3 player, music system, computer laptop. But we have not adequate knowledge for how to use… Read more

Aug 23, 2011 | By jiguparmar

How to save Electrical energy at Home
High Voltage

Capacitor protection by surge arresters – ABB

Generally speaking, capacitor protection by surge arresters has been a difficult task before ZnO arresters became available. The high discharge currents and possible energies associated with an arrester operation at… Read more

Aug 22, 2011 | By Edvard

Capacitor protection by surge arresters
Energy and Power

Autotransformers in few words

It is possible to obtain transformer action by means of a single coil, provided that there is a “tap connection” somewhere along the winding. Transformers having only one winding are… Read more

Aug 19, 2011 | By Edvard

Autotransformers in few words
Industrial Automation

How Stuxnet (PLC virus) spreads – Part 4

Continued from How Stuxnet (PLC virus) spreads – Part 3 » Read here Once the worm has a foothold in the Perimeter Network, it would attempt to infect any print… Read more

Aug 18, 2011 | By Edvard

How Stuxnet (PLC virus) spreads
High Voltage

Budgeting and Financing Substation

The construction of new substations and the expansion of existing facilities are commonplace projects in electric utilities. However, due to the complexity, very few utility employees are familiar with the… Read more

Aug 16, 2011 | By Edvard

Budgeting and Financing Substation
Energy and Power

Applications and forms of differential relays

Differential relays take a variety of forms, depending on the equipment they protect. The definition of such a relay is “one that operates when the vector difference of two or… Read more

Aug 15, 2011 | By Edvard

ABB Residual Current Breaker with Overload Protection RCBo
Geothermal Energy

New download – Geothermal Electricity Basics

Geothermal electricity is electricity generated from geothermal energy. Technologies in use include dry steam power plants, flash steam power plants and binary cycle power plants. Geothermal electricity generation is currently… Read more

Aug 14, 2011 | By Edvard

Krafla Geothermal Station in northeast Iceland
Energy and Power

Whole-House Protection Strategy

No single SPD (Surge Protection Strategy) can protect all the equipment in a residence from all causes of electrical surges. Instead, a whole-house protection strategy, consisting of point-of-entry and point-of-use… Read more

Aug 13, 2011 | By Edvard

SIEMENS - Whole-House Protection Strategy
Electronics

Resistors in detail

Resistors are one of the simplest varieties of electronic components. A resistor is a two-terminal device that has a fixed relationship between the current passing through the device and the… Read more

Aug 12, 2011 | By elaina

Figure 1 - Typical form of carbon resistor
Hydropower

Arrangement of Hydropower Plants

Hydropower machine is the designation used for a machine that directly convert the hydraulic power in a water fall to mechanical power on the machine shaft. This power conversion involves… Read more

Aug 10, 2011 | By Edvard

Arrangement of hydropower plants
Electric Motor

Cooling and Ventilation of Electric Motors (IC)

All rotating electrical machines generate heat as a result of the electrical and mechanical losses inside the machine. Losses are high during starting or dynamic braking. Also, losses usually increase… Read more

Aug 08, 2011 | By Edvard

Cooling and ventilation of electric motors (IC)


EEP Academy Video Courses

The learning platform for LV/MV/HV electrical engineers. Learn from experienced engineers and sharpen up your knowledge.