Energy Efficiency
Energy Efficency In Hospitals – HVAC
In the following lines we will look at a number of case studies for energy saving options. These are subdivided into the following areas: – HVAC – Compressed air – Steam – Lighting – Cogeneration For each of these areas we first… Read more
Dec 25, 2010 | By Edvard Csanyi
Energy Efficiency
How To Achieve Energy Efficiency In Hospitals?
The great majority of the energy used within a hospital is purchased from outside in the form of natural gas and electricity. A small proportion is bought in as diesel oil. The energy bought in is converted by a number… Read more
Dec 25, 2010 | By Edvard Csanyi
Solar Power
Solar Energy Expands, Escapes the Power Grid
Solar power has come a long way since its origins as a niche technology for satellites, finding its way into a wide range of large and small power generation applications. This range of applications is what makes photovoltaics unique among… Read more
Dec 24, 2010 | By Edvard Csanyi
Lighting
Distribution Of Energy For Lighting – History
Edison planned his first installation for New York City, and decided that an underground system of distribution would be necessary. This took the form of a network supplied by feeders radiating ftom a centrally located degenerating station to various feed… Read more
Dec 24, 2010 | By Edvard Csanyi
Energy and Power
Siemens – Busway Purpose and Definition
Commercial and industrial distribution systems use several methods to transport electrical energy. These methods may include heavy conductors run in trays or conduit. Once installed, cable and conduit assemblies are difficult to change. Power may also be distributed using bus… Read more
Dec 23, 2010 | By Edvard Csanyi
High Voltage
Use Of Vacuum As A Breaking Medium
SF6 and vacuum are the two most modern breaking techniques in the fields of Medium Voltage (from 1 to 52 kV) and High Voltage (> 72.5 kV). They appeared in the 1960’s and rapidly developed as of the 1970’s. Today… Read more
Dec 22, 2010 | By Edvard Csanyi
Power Substation
Establishing New Power Substation
The construction of new substations and the expansion of existing facilities are common place projects in electric utilities. However, due to the complexity, very few utility employees are familiar with the complete process that allows these projects to be successfully… Read more
Dec 20, 2010 | By Edvard Csanyi
Energy and Power
Characteristics of Lightning Strokes
Lightning, one of Mother Nature’s most spectacular events, started to appear significantly demystified after Franklin showed its electric nature with his famous electrical kite experiment in 1752. Although a great deal of research on lightning has been conducted since then,… Read more
Dec 19, 2010 | By Edvard Csanyi
High Voltage
Basics Of Subtransmission Systems
Subtransmission systems are those circuits that supply distribution substations. Several different subtransmission systems can supply distribution substations. Common subtransmission voltages include 34.5, 69, 115, and 138 kV. Higher voltage subtransmission lines can carry more power with less losses over greater… Read more
Dec 17, 2010 | By Edvard Csanyi
Maintenance
Maintenance for UPS systems
Maintenance of the UPS consists of preventive and corrective maintenance. Preventive maintenance consists of a scheduled list of activities. Performing these activities keeps the UPS in good working order and helps to prevent failures. Corrective maintenance is performed as a… Read more
Dec 16, 2010 | By Edvard Csanyi
Solar Power
Solar Power Tower
Solar power towers generate electric power from sunlight by focusing concentrated solar radiation on a tower mounted heat exchanger (receiver). The system uses hundreds to thousands of sun-tracking mirrors called heliostats to reflect the incident sunlight onto the receiver. These… Read more
Dec 15, 2010 | By Edvard Csanyi
Electric Motor
Keeping Motor Windings Dry
Special provision should be made to protect motor windings which operate in a damp atmosphere or are subject to condensation of moisture when out of service for long periods. Motors located in galleries of dams are frequently subject to continual… Read more
Dec 14, 2010 | By Edvard Csanyi
Low Voltage
Forms of Separation (2) – Fundamentals
In accordance with the Standard, separation of the various elements of an Assembly: busbars, functional units, terminals, can be claimed providing one or more of the following criteria are met: 1. “Protection against contact with live parts belonging to adjacent… Read more
Dec 13, 2010 | By Edvard Csanyi
Cables
Shielding Of Power Cables
Medium and high-voltage power cables, in circuits over 2000 volts, usually have a shield layer of copper or aluminum tape or conducting polymer. If an unshielded insulated cable is in contact with earth or a grounded object, the electrostatic field… Read more
Dec 12, 2010 | By Edvard Csanyi
Hydropower
Hydro vs. Wind vs. Solar Power?
Matthew Stein, author of When Technology Fails: A Manual for Self-Reliance, Sustainability, and Surviving the Long Emergency wrestles with that very question in his book. Here’s an excerpt: No single RE source works best all the time in all situations…. Read more
Dec 11, 2010 | By Edvard Csanyi
