Электрические станции и их классификации.

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Thermal Power Station.

A modern thermal power-station is known to consist of four principal components, namely, coal handling and storage, boiler house, turbine house, switch gear.If you have not seen a power-station boiler it will be difficult for you to imagine its enormous size.

Besides the principal components mentioned above there are many additional parts of the plant. The most important of them is the turbogenerator in which the current is actually generated.A steam turbine requires boilers to provide steam. Boilers need a coal-handling plant on the one hand and an ash-disposal plant on the other. Large fans are quite necessary to provide air for the furnaces. Water for the boilers requires feed pumps. Steam must be condensed after it has passed through the turbines, and this requires large quantities of cooling water. The flue gases carry dust which must be removed by cleaning the gases before they go into the open air.

A modern thermal power-station is equipped with one or more turbine generator units which convert heat energy into electric energy. The steam to drive the turbine which, in its turn, turns the rotor or revolving part of the generator is generated in boilers heated by furnaces in which one of three fuels may be used-coal, oil and natural gas. Coal continues to be the most important and the most economical of these fuels.

At present great attention is being paid to combined generation of heat and electricity at heat-and-power plants and to centralized heat supply. One of the world’s largest heat-and-power installations is operating at the Moskowskaya thermal power-station-25.

Thermal power-stations are considered to be the basis of our country’s power industry. More than 80% of the country’s total power output comes from the above stations. It is necessary to say that separate power-stations in our country are integrated into power systems. Integration of power systems is a higher stage in the scientific and technical development of power engineering.

Тема № 6 The electric power system.

Энергосистемы и потребители.

 

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http://electrical-engineering-portal.com/electric-power-systems

 

 

Тема № 7 Руководства по эксплуатации электрооборудования.

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WHAT IS A THREE PHASE VOLTAGE TRANSFORMER

The VT3 series of voltage transformers-sensors are designed for pole top use and intended to use for low power remote control- measurement applications in medium Voltage networks from 3-27kV. It has one phase to phase connected transformer and three Y-Y connected resistive voltage dividers.
Modern oil-insulated voltage transformers are suitable for power supply of various remote controlled switches, autoreclosers, motor actuators, remote terminals, radio equipment, etc.
Oil-insulated transformers are most suitable for AMS work, as the fault risk is very limited.
They are made of SIS 2333 stainless steel for best corrosion protection.
The transformer has a core of composite material and an outer shell of silicone rubber. Silicone rubber protects very effectively against UV light and ensures long durability for many years of operation.

 

MAIN ADVANTAGES

· 3-27/0.11-0.22kV, 300 VA, 50/60Hz transformer versions

· High precision Y-Y connected resistive voltage dividers

· No voltage saturation at single earth faults in insulated ground networks

· Oil insulated

· Epoxy – silicone bushings

· Made of stainless steel

TECHNICAL DATA

· Primary voltage: 11 or 22 kV (phase phase)

· Secondary voltage: 220V

· Power: 300 VA

· Completions: Composite and silicone rubber

· Voltage Sensors: 3 x 100MΩ Phase-Earth

· Dimensions: 500 x 400 x 220 mm (hxbxd)

· Operating temperature range: -40... +55 ° C

· Enclosure: IP65, stainless steel

· Weight: 40 kg