The achievement of Einstein's Law

Ernest Walton

In 1932, the English scientists C.D.Cockcroft and E.T.S.Walton tested the validity of Einstein's law in practice, he deliberately bombard the lithium with a high-speed proton that was composed of alpha particles and a large amount of energy. The previous nuclear reaction was associated with a mass loss of 0.0186 atomic mass units.
E.T.S.Walton was found that the amount of energy emitted from the reaction is equal to the amount of energy that can be calculated from Einstein's equation, so Einstein's law was proved and the mass conversion potential

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The idea of nuclear energy

The reaction of nuclear fission is the interaction in which high thermal and light energy is produced in addition to particles such as beta and alpha.
Nuclear energy is released by bombarding the nucleus 235 of neutrons as in following picture. This collision results in a new molecule of unstable that quickly breaks into two molecules and an average of 2 to 3 neutrons, thus colliding with other uranium atoms

Chain reaction

Thus, the process of energy release and the production of neutrons within the so-called Chain reaction. The amount of energy emitted by the splitting of a single atom of uranium 235 is two hundred and two million electron volts

1 MeV = 106 × 1.6 × 10−19 J

Nuclear power reactors produce a huge amount of electrical energy from a small amount of fuel. A few grams of uranium give a quantity of energy equivalent to one tonne of coal. Enough to run a home electricity for about four months, without any carbon emission. (Note: Production of 1 GWh of coal-fired plant produces 1041 tonnes of CO2

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Nuclear bonding energy

The nucleus of helium consists of proton and neutronin, It was supposed to be the relationship between them as in the following Figure

The nucleus of the helium nucleus is 4,0015 units of atomic mass.
The proton mass is 1.0073 atomic mass units.
Neutron mass is 1.0087 atomic mass units.

Since the nucleus of helium consists of proton and neutronin, the mass of the helium nucleus can be calculated as follows:
Protonin mass = 2 × 1.0073 neutron mass = 2 × 1.00
Protonin mass = 2.0146 neutron mass = 2.0174
Total mass of protons and neutrons = 2.0146 + 2.0174 = 4.0320 units of atomic mass

By comparing the actual helium mass with the total mass of its nuclei, there is a difference in mass as in the following Fig

The difference in mass between the helium nucleus and its total components is 0.0305 atomic mass units. The German-American physicist Albert Einstein (1879-1955), in 1907, using the purely mathematical analysis, he  was able to prove that energy and mass They are only two sides of a single coin which means that the substance can be converted into energy and energy into substance.

Einstein was able to put his illustrious equation

E = M C²

This energy is called the Binding ENERGY

For example, the nuclear energy produced by converting one gram into energy is 85,000 million BTU, which is equivalent to 25 million kilowatt hours, or the equivalent of the energy produced by the burning of nearly 5,000 tons of Coal.

^{Important note:}

1. When one kilogram of uranium is fissioned, the difference between the mass of the material before and after the fission process is equal to one gram, ie, one gas is converted to energy and the remaining 999 is discharged as waste. Therefore, you may find the same previous statement mentioned in the reference However, instead of the word gram, you will find the word kilogram  and therefore it is necessary to distinguish.
2. A 1,000 megawatt power plant needs only 2 Kilogram per day of fissionable enriched uranium to be operated. This amount of fuel can be provided by supplying the reactor with 50 kg of enriched uranium by 4% (18 tons per year and up to 30 tons if the enrichment rate is lower). This amount of fuel remains very low compared to 3 million tons of coal Stoneware is required to operate the same plant annually.

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STEP DOWN TRANSFORMER

1- MAIN COMPONENTS OF OIL IMMERSED TRANSFORMER

1-1- The Core

• In a transforming voltage from a primary coil induced to the secondary coil of the production of magnetic flux in the core of the transformer.
• In all types of construction, high-permeability-grade core, high-rolled grain-oriented laminated silicon steel. Laminations are assembled together to provide minimum magnetic loss.
• The resistivity of the steel sheet is made by making the laminations very thin and thus
• Thickness of the lamination is between 0.25mm to 0.5mm, the laminations are electrically insulated from each other by a very thin coating of insulating varnish.

1-2- The Winding

• Transformer windings (coil) are made from copper wire and wound on the core of the transformer. The low voltage winding is placed on the core and high voltage winding is placed on the low voltage winding.
• The coils are paper insulated of insulation class 'grade A'.
• The winding is connected to the voltage source and creates a magnetic flux called the primary winding, and the other winding called the secondary in which voltage is induced as a result of mutual induction.

1-3- Tank and conservator

• The core and coil assembly are immersed in an Oil Tank. The oil acts as an insulating and cooling medium for the transformer.
• The Tank is connected to a Conservator, placed above the Tank and connected with the Tank by pipes. The conservator is in the process of expanding oil. It also acts as a reservoir for transforming insulating oil.
• The conservator is connected to the atmosphere with a connection to the top of the conservator. The pipe is connected to the atmosphere through a Silica gel breather.
• During expansion and contraction of the air is the breath of the Silica gel breather.
• Silica Gel in the breather absorbs moisture content of the air taken inside which ensures no deterioration of insulating oil properties due to atmospheric moisture ingress.
• The storage tank should be mounted above the highest point of the equipment oil circulation system and, in the case of on-load tap-changer transformers, two (2) oil-tight compartments. and the appropriately sized gas, one for the main tank and one for the bypass switch compartment must be provided.
• The preservative must not allow contact between the oil in the main transformer tank and the switch compartment (if available) and outside air.
• This must be achieved either by the use of a diaphragm between the oil and the air, or by the use of a multi-compartment preservative with internal baffles.

1-4- The Cooling system

• When a Transformer is loaded, the current starts flowing through its windings and produces heat that transforms the temperature of Transformer Oil. The oil tank is connected to the outer end of the radiator with isolating valves. The radiator accelerates the cooling rate of transformation.
• In order to increase the frequency of cooling, they are widely used to transform along with the radiators. Fans operate automatically with rise of oil / winding temperature.
• MVA rating of transformer provided with external cooling fan on the radiator is given for the Oil Natural Air natural cooling (ONAN i.e. fan not running) and Oil Natural Air forced cooling (ONAF, i.e. with fan running). Start and stop the fans are controlled by oil / winding temperature.
• The above types of cooling systems are mainly used, but for very large transformers, in addition to the cooling fans, an oil pump is also installed in the pipe between the tank and the radiator.
• This type of cooling is called Oil Forced Air Forced (OFAF).
• Regardless of the ONAN and ONAF rating for forced and forced air (OFAF, that is both the fan and the oil pump), this is also mentioned for this type of transformer.
• Starting and stopping of the oil pumps is controlled by the oil / winding temperature.

1-5- Voltage Regulation Equipments

• Transformers are generally provided with Taps for adjustment of voltage ratio by adding or removing tapping turns.
• Two types of tap changer are used viz. No Load Tap Changer (NLTC) and ON Load Tap Changer (OLTC). Taps are provided on the HV winding.
• The NLTC is simple type and can be used only when the transformer is de-energised whereas OLTC can be operated when the transformer is loaded without interrupting the current. 
• Transformer with OLTC is provided with a Remote Tap Changer Control (RTCC) panel from which tap can be changed manually/electrically and also in auto mode to maintain the pre-set voltage of the system to which transformer is feeding power

1-6- Terminals

• The winding connections are brought out to insulated bushings where they connect with the supply and the load. 
• Generally in all transformers, Terminals are suitably designed for connecting bare conductor, cables or bus-duct depending on the requirement. 
• In most cases terminals are air-insulated but transformer with cable terminal box can be air insulated or oil-insulated.

1-7- Buchholz relay

• A Buchholz relay is located in the connection pipe between the main tank and conservator. The relay has two functions:
• Collect free gas on their way to conservator.
• Sensitive when oil flow between main tank and conservator exceeds a pre set value.
• When minor amount of gas is collected in the relay an alarm actuated. If an additional amount of gas is collected tripping contact actuated. 
• In case of heavy fault with in the transformer arcing may occur within the transformer, this will lead to sudden push a burst of oil in the conservator from the main tank. Such fault causes actuation of tripping contact.
• The Buchholz relay has gas release pockets on top to collect the gas in the relay for testing to understand the nature of fault in the transformer.

1-8- Temperature Indication

2- Oil and Winding Temperature Measurement

2-1- Oil temperature indicator (OTI)

• These  devices  are  designed  to  measure  the  temperature  of  the  insulating  oil  inside  of power transformer tanks. 
• The bulb  of thermometer detects  the transformer oil temperature variations generating a contraction  or  expansion  of  the  capillary  connected  to  the  pointer shaft.  
• The  adjustable switching system connected to the pointer shaft provide the desired alarm/trip signals.

2-2- Winding temperature indicator (WTI)

• The  winding  is  a  “high  temperature”  component  in  oil  transformers,  subjected  to  fast temperature  changes.  Thus,  an  indirect  system (Called Thermal Image Principle)  is  used  to  measure  the  winding temperature because it is dangerous to place a sensor close to the winding. 
• This instrument is designed to measure the temperature of winding by using a special bulb surrounded  by  a  heating   resistance  through  which  passes  a  current  proportional  to  the winding current under certain load and temperature conditions. 
• The bulb  detects  the  temperature  variations  generating  a contraction  or  expansion  of  the  capillary  connected  to  the  pointer  shaft.  The  adjustable switching system connected to the pointer shaft provide the desired alarm/trip signals.
• The top oil temperature is measured directly by sensor kept in oil pocket in the oil top layer in the tank. 
• Winding temperature is measured in indirect way; by connecting the Secondary of the Current Transformer (CT) through a shunt resistor (heater coil) inside the Winding Temperature Indicator. 
• The Heater Coil heats the operating bellow of the temperature indicator to give additional temperature rise of the winding over the oil temperature.
• Both winding and oil temperature have two output contacts, one for pre trip alarm and other for tripping, if the temperature rises to a set value or above.
• For ONAN and OFAF transformer apart from alarm & trip contact, output contacts are provided for auto start of cooling fan and oil pump.

OIL LEVEL  GAUGES

• The oil    level  gauges  serve  the  purpose  of  visually  indicating  the  oil  level  in  a  tank  or  in  a conservator of oil filled transformers.
• It is normal practice to use magnetic oil level gauges with low level alarm and trip contacts. This can also be of the plain glass or prismatic type. 
• The oil level gauge is marked to indicate minimum, normal and maximum oil levels in the conservator (as a function of conservator capacity). 
• The conservator (or partition) for on-load tap changer carries its own oil level gauge. 
• For bigger units, oil level gauge is fitted on the tank also.

Dehydrating breathers

• During the breathing process, the incoming air may consist of moisture and dirt which should be removed in order to prevent any damage. 
• Hence the air is made to pass through the silica gel breather, which will absorb the moisture in the air and ensures that only dry air enters in to the transformer.
• Silica gel in the breather will be blue when installed and they turn to pink colour when they absorb moisture which indicates the crystals should be replaced. 
• These breathers also have an oil cup fitted with, so that the dust particles get settled in the cup. 

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Nuclear power plants

 
 Nuclear generating plants are a kind of thermal generating station, because they operate by heat in the same way as generating steam. Then this steam rotates the turbines, which rotate the rotor from the electric generator and generate electrical energy on the stationary parts of the generator.

   The main difference between conventional steam stations and nuclear plants is that in nuclear power plants the fuel-burning furnace is replaced by a reactor that generates heat as a result of the fission of uranium and uses this enormous thermal energy to evaporate the water in the boilers and convert it into Vapor with high pressure and high temperature

   This reactor needs a insulation wall and beams of atomic radiation and therefore consists of a layer of fire bricks, a layer of water and a layer of steel and then a layer of cement up to two meters to protect the workers in the plant and the surrounding environment from pollution by atomic radiation.

   The world's first nuclear power plant was carried out in 1954 and was in the Soviet Union with a capacity of 5 megawatts.


Read also:

• Nuclear bonding energy
•   The idea of nuclear energy
•   The achievement of Einstein's Law

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The electrical grid

Thomas Edison created the world's first power plant in New York in 1882, and after several unsuccessful attempts, he succeeded in generating a continuous electric current. "i have not failed i just found 10000 ways that won't work meaning."

• Importance of interconnected electricity network

In all countries of the world, the power stations within each country are connected together by a high voltage transmission network, so that all generators are connected to one network. All loads are taken from the same network

     The objective from this method of connecting the generating stations together. If each station is responsible for a particular city, the exit of this station from service for any reason means the loss of electrical energy in this city.

    The main benefit of connecting several networks together is to reduce the spinning reserve of each network, thereby reducing the investment spent on building new plants to meet demand without compromising the safety and reliability of the associated networks.

   The interconnection is also aimed at reducing pollution of the environment. 

• Main features of electrical connection

      The main advantage of this interconnection is strongly demonstrated in the Blackout cases. This connection is useful in the process of restoration. Sometimes their importance appears in the peak energy exchange, but this latter feature only appears if the countries involved are spaced in meridians so that they do not peak simultaneously, making the exchange difficult (unless the country has a large production that exceeds its maximum consumption)

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Classification of electrical power plants

It can be classified into two types of power plants: conventional plants, renewable energy.

One of the most popular types of conventional power plants:

• Thermal Power Stations
• Gas Turbine & Combined cycle
• Diesel Power Stations
• Nuclear Power Stations
• Hydroelectric Power stations

The most famous types of new and renewable power plants:

• Wind Power stations
• Solar Power stations
• Tidal Power stations
• Geothermal Power Stations
• Biomass Power Stations
• Wave Power stations
• Conversion Ocean Thermal Energy
• Fuel Cells Power Plants

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Power measurement units

   Since power generation is a process of energy conversion, we should refer here to energy measurement units. Energy is generally (mechanical, electrical, or thermal) measured by the Joule unit.

In the case of mechanical energy 
Mechanical energy can be expressed in three different images (all images of the same energy but with different transformations):

1. Potential Energy, PE = mass x gravity acceleration x height
2. Kinetic Energy, KE= 0.5 mass x velocity ²
3. Work,: the final achievement of this mechanical energy, which is moving something for a certain distance, Work = Force x distance

All of them are measured by the unity of the joule. 

   The joule expresses the amount of work done by a force of one Newton when you push a object to a distance of one meter: Joules = Work = Mechanical Energy (J) = Force (N) x Distance (mt)

And in the case of electric power

The same unit (joule) represents the electricity consumed in the second within any electrical device with a power of one Watt:

   Electrical Energy = Power (watt) × time (sec) = Volt × Amp × Sec = Joules

Since this unit represents a small amount of energy, we can use larger units such as kWatt-Hour

1 (KWH) = 1000 x 60 x 60 = 36 x 10⁵ Joule

^{1 W.H = 3600 Joule}

^{Note: joule is also equivalent Electrically:}

• The energy obtained by an electric charge of 1 colum when moving between voltages of 1 volt.
• Energy required to conduct an electric current of 1 amp between the difference voltage of 1 volt during 1 second.

   The origin of electrical energy can be chemical as in batteries, or mechanically as in generating plants, or as in solar cells. What is important here is to emphasize that electric energy comes only from other energy.

In the case of thermal energy

Energy is often measured in a unit called calorie in the English system measured in another unit, (the British Thermal Unit, BTU),one Joule represents the energy consumed Q to raise the temperature of one gram of water to one degree Celsius.

𝐴𝑚𝑜𝑢𝑛𝑡 𝑜𝑓 𝐻𝑒𝑎𝑡=𝑄=𝑚(𝑘𝑔) × 𝑐(𝑆𝑝𝑒𝑐𝑖𝑓𝑖𝑐 𝐻𝑒𝑎𝑡 𝑐𝑜𝑛𝑠𝑡)× Δ𝑇(℃)

The relationship between Joule and Calorie is:

1 Calorie = 4.18 Joule

The temperature degrees can be expressed in three different ways:

1. Using degrees Celsius. 
2. Using Kelvin scale K₀ (Temperature Absolute), And we get added 273 to degrees Celsius.
3. Fahrenheit measurement (the most commonly used in America), the following equation shows the method of conversion from Celsius to Fahrenheit.

F = 32 + 1.8 times ° C

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The most important sources of energy

The sources of energy are two types:

1- Fossil Fuel: is the remains of organisms from plants and animals that have been buried deep underground for many years and It was subjected to very high temperatures and pressure, which led to the concentration of carbon in it and its transformation into fossil fuels. One of the most important examples of fossil fuels is coal, oil, and natural gas.

    Fossil fuel has been named by this name either because it is extracted from fossils (fossils are organisms that died millions of years ago and buried in the ground), or because they need drilling tools to be used from the ground.

    Fossil fuels account for 90% of the total energy used in our daily lives. One of the most important that has made fossil fuels an important source of energy production is that it has a high energy density, easy transport and storage, and when it is processed chemically, we get different types of fuel that have multiple uses.

    In spite of all these benefits and improvements in fossil fuels, it is one of the main reasons for the destruction of the environment. It is one of the main reasons that led to the phenomenon of (global warming), air pollution due to harmful gases and volatile substances resulting from Burn it.

2-  Renewable energies:  such as solar, wind and energy extracted from Geothermal and biomass energy, and others.

We can say that the origin of all these sources (both traditional and renewable) is the sun, which is almost the source of all energies on the surface of the earth. Winds move only from high pressure to low pressure, and the sun controls this pressure. And the same think the rest of the energies sources  such as tides, and the energy of the waves and the energy of the ground, etc.

      The plant as we mentioned its origin of the fossil fuel. The source of the energy that is placed in the plant is the sun, and then you will always find a direct relationship between the source of energy and the sun.

3- Nuclear power: perhaps exception to the previous rule of specific types such as nuclear power, this has nothing to do with the sun.

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Electric power system

What is the power system?

This system consists of three basic systems:

1-  Power generation system: which includes several topics systems, including: unified networks, control of generating capacity, and types of stations.

2- Power Transmission System: This system is divided into two parts: Overhead Transmission System and Underground Cables, and the student should be aware of such topics as studying the types of conductors, types of insulators, cable faults and active power transmission, as well as the impact of reactive power and its relation to change and stability of networks.

3- Power distribution system: This system is concerned with the transfer of energy to consumers through the medium voltage network as well as low voltage network.  and the student should be familiar with the many topics related to the planning of distribution networks, distribution network components, distribution and control systems, etc.

    - The work of these three systems is organized by a set of subsystems: the protection system, the control system, the measurement system and the communications network.

    - The substations are the main interconnections between the three systems, where the former auxiliary systems are located inside (Protection - measurement - communication - control).

    - Of course, all systems work together to achieve the quality of the service required, and with the verification of the network stability (Power System Stability), the first means the ability of the network to quickly restore the normal values of operation (both frequency or voltage) after the network perturbations, whether these perturbations are simple or big.

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How does Blackout happen?

One of the dangers in the electrical network is the occurrence of so-called full darkness or blackout,
and represents a failure of the network maintains constant voltage and frequency, leading to the exit of all generating units from the service and then outages electricity for all loads.

The electrical grid, as we know, is made up of power plants connected to each other to feed electrical loads, but the strange thing is that there is no component of the electrical grid that can store energy, and therefore a period electricity storage is zero, meaning that the energy generated is always instantaneous, noting that the speed of the electricity from the source of pregnancy is the speed of light, that is, everything is instantaneous.
The balance between demand and generation must be maintained: there are millions of consumers who have loads that need to active power P (MW), and other loads that require reactive power Q (MVAR) and at the same time are required from the generating stations provide these orders instantaneously. So it is a very complicated system, and once this balance is broken, it falls the entire system and complete blackout occurs.

Suppose, for example, that at a peak time, where the network operates at maximum generating capacity, then, for some reason, there was a malfunction in one of the power plants, which stopped and went out of service suddenly. When these come out the other units must work quickly to provide the necessary energy to compensate for the resulting the exit of that station, but at peak time as we mentioned all units are working at maximum capacity and can not afford any increase in loads, the protection systems are used and the units are removed from the grid so that the generator does not burn then, we get to the Blackout, and this is one of the scenarios of the Blackout

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EXHAUST SYSTEM WITH SILENCER

•     Function of Exhaust System:
  

−The exhaust system guides exhaust gas from the gas turbine via the exhaust diffuser to the heat recovery steam generator (HRSG) of a combined cycle power plant and finally to the atmosphere through the main stack.−After leaving the last stage of the gas turbine, the exhaust gases are directed through an exhaust system, which includes an exhaust plenum mounted on the outlet end of the turbine. The exhaust plenum directs the exhaust gas into the exhaust ductwork, which transports the hot gases into the inlet ductwork of the heat recovery steam generator (HRSG) for utilization of its thermal energy. The exhaust system includes an expansion bellows that allows for the thermal movements of the plenum and exhaust ductwork.−Silencer is installed in the HRSG main stack. Silencer should be installed to reduce noise at stack outlet because hot temperature exhaust gases from gas turbine makes noise. Therefore, splitter in silencer made of material to absorb noise. Silencer outlet sound level shall be maintained 85 dB(A) at all operating condition.

• The major parameters of the exhaust system are:

−Exhaust gas flow at base load    :  616.2 kg/s (When Fuel is Gas)

                                                               610.9 kg/s (When Fuel is Oil)
−Exhaust gas temperature with compressor  :  607.6°C (When Fuel is Gas)

   inlet temperature 35°C at base load                  557.4°C (When Fuel is Oil)
−Pressure loss at turbine outlet for both  :  36.3 mbar  fuel (i.e. gas and oil)

• The major components of the exhaust system are:

−Exhaust Diffuser
−Exhaust Plenum
−Expansion Joint
−Exhaust Duct

•     Exhaust Diffuser:

−Gas turbine exhaust is fed through the exhaust diffuser, the downstream exhaust system and into the main stack to utilize the maximum thermal energy from hot exhaust flue gases in the HRSG; in the process static pressure increases as a function of the decrease in velocity.−A manhole located in the upper portion of the exhaust diffuser is provided to permit access into the exhaust diffuser during inspections.

• Exhaust Plenum:

−The function of the exhaust plenum is to direct the gas turbine exhaust gases into the exhaust ductwork.

• Expansion Joint:

−The function of the expansion joint is to allow for the thermal movements of the exhaust plenum and exhaust ductwork.

• Exhaust Duct:

−The function of the exhaust duct is to transport exhaust gases from the outlet of the gas turbine into the inlet ductwork of the heat recovery steam generator (HRSG).

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GAS TURBINE - STARTING SYSTEM

1-STARTING SYSTEM

•  GT starting system used here is Static Frequency Converter (SFC).
•   When all permissive of GTG are met and auxiliary checks are satisfied, GTG TCS sends to DCS a signal of “READY TO START”. On obtaining the signal, DCS sends GT start signal to GT TCS. The gas turbine is started up by turning the generator via the starting frequency converter (SFC).
• The starting frequency converter also turns the turbine via the generator for compressor cleaning and for heat-recovery steam-generator purging in combined-cycle operation.
• The power section of the SFC consists of the following components:

                   −Supply via the SFC transformer

                   −Two fully controlled three-phase thyristor bridges, line-side converter and the generator side converter

                   −Current DC link reactor decouples line- and generator side converters 

                   −Radial fan for heat dissipation

2-STARTING FREQUENCY CONVERTER (SFC)

•    Power Supply                                                                                                                                           −The SFC is fed via the SFC transformer from the medium-voltage supply of the plant auxiliary power supply system i.e. BSDG (Black Start Diesel Generator).

•   Perating Aspects                                                                                                                                         −A SFC is used to drive the generator in synchronous motor operation to accelerate the gas turbine train. Synchronous motor operation requires static excitation equipment (SEE) for field control over the complete speed range. During SFC operation the SEE controls the excitation current according to the SFC requirements.

            −The SEE, which operates only one generator, is also used for signal interchange between SFC and control system.

  −SFC operation is controlled fully automatic by the control system sub group control, except of the compressor cleaning mode.

          −The SFC is designed for four gas turbine starts in sequence. After this, a cooling down time of at least two hours must be observed.

      

3-SFC OPERATING MODES

•   SFC Standard Operating Modes are:

         −Unit start: SFC provides rated output power to start up the gas turbine train.   Gas turbine  will be fired in low speed range and SFC supports the   acceleration above the self sustaining speed of gas turbine and   switches off at 70% of nominal speed.

     −Compressor Cleaning: The turbine-generator is turned to clean the gas turbine compressor   blades. Depending on turbine type constant or various speeds can   be provided in low speed range. The gas turbine remains unfired   during this operation. This mode is operated manually from the   control system. Turning in this mode is at a various speed between   approximately 23 to 27% of rated speed.

      −HRSG Purging (Option): On boiler request the purging mode will be executed prior gas turbine start. Ignitable gases, which might be injected during the last   gas turbine operation, are flushed out of the heat-recovery steam   generator (HRSG) of combined-cycle units. Depending on turbine   type, constant or various speeds can be provided in low speed   range. The gas turbine remains un-fired during this operation.

CHANGE OVER FUNCTION

•   A change over function can be supplied as an add-on option that allows the start-up multiple gas turbines with one SFC. Start up availability can be improved when more than one SFC is used to start all gas turbines in a SFC starting bus.
•   The changeover function requires beside the starting bus power connection among the units a data link.

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