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Showing posts with label Electrical Engineering. Show all posts
Showing posts with label Electrical Engineering. Show all posts

The Diesel Generator Set



The combination of a diesel engine, a generator and various devices like,
1) base
2) canopy
3) sound attenuation
4) control systems
5)circuit breakers
6) jacket water heaters
7) starting systems etc,

is referred to as a generating set or a gen set in short.
While the larger industrial generators can range from 8kVA - 30kVA for homes, small shops & offices up to 2000kVA used for large office complexes, factories. A 2000 kVA set can be housed in a 40ft ISO container and be fully packaged and portable. Sizes up to about 5 MW are used for small power stations and these may use from one to 20 units. In these larger sizes the engine and generator are brought to site separately and assembled along with ancillary equipment
Diesel generators, sometimes as small as 250 kVa are widely used not only for emergency power, but also many have a secondary function of feeding power to utility grids either during peak periods, or periods when there is a shortage of large power generators.

Diesel generator on an oil tanker Ships often also employ diesel generators, sometimes not only to provide auxiliary power for lights, fans, and winches, etc. but also for main propulsion. With electric propulsion the generators can be placed in a convenient position, to allow more cargo to be carried. Electric drives for ships were developed prior to WW I. Electric drives were specified in many warships built during WW II because manufacturing capacity for large reduction gears was in short supply, compared to capacity for manufacture of electrical equipment. [1] Such a diesel-electric arrangement is also used in some very large land vehicles.

Generating sets are selected based on the load they are intended to supply power for, taking into account the type of load, ie emergency or for continuous power, and the size of the load, and size of any motors to be started which is normally the critical parameter to chose a Gen set.

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Posted by Kami Sunday, June 7, 2009 0 comments

Power Line Communication System



PLC Power line communication, also known as power line carrier, mains communication, power line telecom (PLT), or power line networking (PLN), is a system for carrying data on a conductor also used for electric power transmission. Broadband over Power Lines (BPL) uses PLC by sending and receiving radio signals over power lines.
Electrical power is transmitted over high voltage transmission lines, distributed over medium voltage, and used by the end users at lower voltages. Power line communications can be applied at each stage. Most PLC technologies limit themselves to one set of wires, but some can cross between two levels eg, both the distribution network and premises wiring.
All power line communications systems operate by impressing a modulated carrier signal on the wiring system. Different types of power line communications use different frequency bands, depending on the signal transmission characteristics of the power wiring used. Since the power wiring system was originally introduced for transmission of AC power, the power wire circuits have only a limited ability to carry higher frequencies. The propagation problem is a limiting factor for each type of power line communications.
Data rates over a power line communication system vary widely. Low-frequency (about 100-200 kHz) carriers impressed on high-voltage transmission lines may carry one or two analog voice circuits, or telemetry and control circuits with an equivalent data rate of a few hundred bits per second; although, these circuits may be many miles / kilometers long. Higher data rates generally imply shorter ranges; a local area network operating at millions of bits per second may only cover one floor of an office building, but eliminates installation of dedicated network cabling system.

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Posted by Kami Saturday, May 31, 2008 0 comments

Low Voltage Power Distribution


In electrical engineering distribution is very typical field all the power a system generates and all the power a system transmittes will be un usefull if their is not a reliable Power Distribution System.

It is also diversified in high voltage and low voltage distribution system.
The low voltage is the most use full source for any domestic or a light load commercial purposes and the all the electric utilities companies got their revenue and profit through the low voltage power distribution system. In the Picture below you can see the low voltage power distribution control and safety system designed by the Siemens.

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Posted by Kami Wednesday, April 23, 2008 0 comments

Steper Motor Technology


Fundamentals of stepper motor drive technology
Classic and inexpensive: Drives with stepper motorsStepper motors are ideal for applications where cost optimisation is more important than speed and dynamism.
High-end axis controller SPC 200The SPC 200 can control up to 4 pneumatic or electrical axes. One of the main development criteria was ease of use:
Record selection: for positioning tasks with fixed traversing movements which can simply be called up via I/Os.
Program mode: with up to 100 programs for solving the most complex tasks or calculating and changing positions; I/Os control the process
Quick commissioning using the WINPISA diagnostic and programming tool
The PROFIBUS fieldbus interface facilitates direct reading and writing of the position data. You can calculate, select and archive the position in a PLC and then download it directly into the SPC200. A functional module for the Siemens S7 controller family provides assistance.

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Posted by Kami Saturday, April 19, 2008 0 comments

Power System Engineering



Power System Engineering deals with the generation, transmission and distribution of electricity as well as the design of a range of related devices. These include transformers, electric generators, electric motors, high voltage engineering and power electronics. In many regions of the world, governments maintain an electrical network called a power grid that connects a variety of generators together with users of their energy. Users purchase electrical energy from the grid, avoiding the costly exercise of having to generate their own. Power engineers may work on the design and maintenance of the power grid as well as the power systems that connect to it. Such systems are called on-grid power systems and may supply the grid with additional power, draw power from the grid or do both. Power engineers may also work on systems that do not connect to the grid, called off-grid power systems, which in some cases are preferable to on-grid systems. The future includes Satellite controlled power systems, with feedback in real time to prevent power surges and prevent blackouts

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Posted by Kami Monday, April 14, 2008 0 comments

Breif History Of Electrical Technology


Electrical engineering sometimes referred to as electrical and electronic engineering is an engineering field that deals with the study and application of electricity, electronics and electromagnetism. The field first became an identifiable occupation in the late nineteenth century after commercialization of the electric telegraph and electrical power supply. The field now covers a range of sub-studies including power, electronics, control systems, signal processing and telecommunications.
Electrical engineering may or may not encompass electronic engineering. Where a distinction is made, usually outside of the United States, electrical engineering is considered to deal with the problems associated with large-scale electrical systems such as power transmission and motor control, whereas electronic engineering deals with the study of small-scale electronic systems including computers and integrated circuits.Another way of looking at the distinction is that electrical engineers are usually concerned with using electricity to transmit energy, while electronic engineers are concerned with using electricity to transmit information.

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