The dinowig power station Essay


The dinowig power station is a1800MW wired storage hydroelectric strategy that was commissioned in 1984 and was regarded as one of the universe ‘s most Imaginative technology and environmental undertaking, it comprises of 16km of belowground tunnels deep below the Elidir Mountain

And its building required 1 million metric tons of concrete, 200 metric tons of cement and 450 metric tons of steel. In the station there are 6 power bring forthing units, the chief in-let valves that house the works which regulates the H2O that flows into the turbine.

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1 History of Dinorwig power

Dinorwig is a little small town that has a long history of slate prey located near Llanberis in Gwynedd, North Wales. The word Dinorwig means “fort of ordovices” because it was thought to be a portion of the district of the ordovice folk. In the late 1770 ‘s until 1969, the slates from the vale are used by the Romans for building until after the First World War where surrogate roofing stuffs was available, the production and the used of these slates from the Valley declined and the people populating at that place relocated to a nearby towns. Today the small town portion its name with a wired storage hydroelectric power station known as Dinorwig power station.

2 Construction of the power station

The dinorwig power station was constructed on an abandoned slate prey located at deep inside the mountain Eldir fawr. The undertaking was awarded by the Uk authorities to a British building house known as Alfred Mc Alpine and it took up to ten old ages to finish the building of the power station because about 12 million metric tons of stones were excavated inside the mountain making tunnels and caverns of about 51m tall, 180m long and 23m broad known as “concert hall” . The dinorwig power station is connected to the national grid substation at Pentir by a 400kv overseas telegrams that are buried about 6 stat mis instead than utilize unsightly transmittal towers to convey electricity to the country with an outstanding natural beauty.

3 Environmental restraints at the site

During the building of the site, the scientist guarantee the protection of the Welshman Arctic Charr, a native to Llyn Peris, a programme was devised to guarantee the protection of these rare fish that are found in about four lakes in Wales to a safe location ; a nearby glacial lake and they besides guarantee uninterrupted monitory of the environmental issues such as the H2O quality and wildlife protection within the site. The designers and applied scientists find it hard besides in disposing about one million metric tons of stones during building and sites were chosen were the stones could be dispersed and the contour of the local landscape ; grasses, trees and bushs were planted in order to better and continue the rich and varied natural life that surrounds the power station.

4 Detailed descriptions of operations

The dinorwig power works stored H2O at a high height in marchlyn reservoir, a lake in Snowdonia behind Elidir Mountain and is discharged into Llyn Peris through the turbines during times of peak electricity demand and its normally pumped back from Llyn Peris to Marchlyn during off peak times. The dinorwig power station uses more electricity to pump the H2O back than it generates on the manner down and the pumping is normally done during the periods of low electricity demands and when the energy is cheaper to devour. Dinorwig comprises of 16km of belowground tunnels, deep the Elidir Mountain with three chief caverns

  • The chief recess valves gallery
  • The machine hall
  • The transformer hall.

The chief recess valve gallery at the upstream terminal links to the machine hall, whereas the transformer hall lies on the down stream terminal with the machine hall located below them.

4.1The machine hall

Dinorwig machine hall was designed so that the pump/turbines will be sited below the degree of the lower reservoir in other to understate the harm to the turbine blade caused by entrapment of air bubbles, this machine hall houses six pump/turbines and generator motors ; the control room, the low electromotive force switchgear, care workshops and the power Stationss warming and airing systems. The machine hall has a length of 180m and a breadth of 24m and a tallness of 51m.

4.2The transformer hall

The transformer hall contains the monolithic transformer which converts the 18,000 Vs current produced by the generator to the needed electromotive force for transmittal through the national grid which is normally 400,000 Vs. The transformer are connected to the metal-clad switchgear on the floor above with a tallness of about 17m, a breadth of 23m and a length of 160m.

4.3The control room

This is located within the machine hall and is the Centre of all system direction and operation, it controls each bring forthing unit, programming the 300 single stairss that guide each from shutdown to full power end product. The operations here are normally in contact with the national grid and a individual operation can oversee the whole six units of the turbines.

The Hydraulic system

During the bring forthing procedure, the system has to speed up the 2km H2O column from deadlock to full flow in merely 11 seconds every bit good as covering with a maximal demand of 390 three-dimensional meters of H2O per seconds through the recess valves supplying sustained and dependable electricity end product.

4.4The rush pool

Its major map is to move as a safety valve when the coevals procedure is complete and the recess valve stopping points. The rush pool besides provides modesty H2O for the high force per unit area consequence as the coevals starts.

4.5Main recess valves

This houses all six recesss valves and these Hugh building controls the flow of H2O into the station to drive the turbines. The valve can be opened to 50 % capacity within 5 seconds let go ofing up to 65m3 of H2O per seconds into the turbine system, inside each valve there is a immense ball mechanism which unfastened and stopping points by two 16 metric tons hydraulic counter weight weaponries. The recess valves have been constructed to defy the utmost forces and force per unit area of big H2O ; it takes about 20 seconds for the valve to shut.

4.6The pump/turbines

Here the H2O that passes through the in-let valve at high force per unit area is directed to the turbine smugglers which is the traveling portion of the turbine and is basically a horizontal H2O wheel connected to the turbine ‘s cardinal shaft. The force of the H2O that passes through rotates the shaft at 500rpm in a clockwise way to the power of the generator and when this generator is run as a motor to change by reversal the rotary motion of the shaft, the unit act as a pump to transport H2O from Llyn Peris back to Marchlyn Marr.

4.7 The generator motors

The Dinorwig generator motor is coupled to the pump utilizing a cardinal shaft and this generator is magnetic rotor which spins within a round stator, the electricity is created through the electromagnetic initiation rule. During the operation of the system, the air ice chests regulate the temperature of each unit which has been built with mechanical and electrical braking systems and electronic governors to command bring forthing and pumping. At Dinorwig power station, the bring forthing units stand vertically to do efficient usage of infinite, each rotor weighing 445 metric tons. The generator motors are connected to a complex web of coach saloon within the transformer hall which steps up the electromotive force for transmittal utilizing the belowground overseas telegrams to pertir station. The electricity that is fed to the national grid is from the generator motor.

4.8 Spinning-in-air

The Dinorwig power station is enhanced by the fast response of the whirling air map which allows each of the turbines to work fast during operation. In its stationary manner the turbine are immersed to the H2O and since the generator is placed on standby, compressed air is injected into the turbine thereby displacing the H2O. The generator and the spinning-in-air are brought together utilizing a really little sum of electricity and when direction is received from the national grid to get down bring forthing about instantly where the recess valves clears and stopping points within five seconds as the H2O flows take over thereby bring forthing electricity. This procedure reduces the sum of energy required to maintain the turbines on a standby manner.

Dinorwig dikes

Dinorwig power station comprises of two dikes viz. ;

  • Marchly dike
  • Afor -y-Bala dike

5.0 Principle for runing generator motors and pumps turbines

The rule under which Dinorwig power station plants is when two big volume of H2O are stored in the reservoir at different height, the H2O is so released from the top reservoir making energy that will be used to drive the turbine which in bend powers the generator to make electricity. The H2O that is captured from the lower reservoir is so pumped back to the upper reservoir through the pumped shaft to the turbine shaft utilizing a pump motor that is powered by electricity from the national grid. The H2O that is pumped back will be stored in the upper reservoir.

The cross-section of the Dinorwig power station strategy. The cross-section of the Dinorwig power station strategy.

During the operation, the H2O is released through the caput gate into the concrete-line low force per unit area tunnel system and as the down flow reaches the rush shaft, it so pumps up to 568m before come ining the high force per unit area tunnel system which splits into 6 offprints and narrow steel-lined sluicegates which so directs the H2O through the recess valves and to the turbines. All the turbines are connected to their ain generator and every bit shortly as the shaft rotates the generator immense cardinal rotor, which spins within a stator to bring forth electricity. This electricity produced is increased to 400,000 Vs by a transformer web before it is connected to the 400kv overseas telegrams about 11km resistance to the national grid.

6.0 Dinorwig function in providing electricity to the national grid

In England and Wales most of the electricity distributed to the state is by a web of power lines owned and controlled by the national Grid and it their duty to guarantee that electricity is available anytime needed. Since the demand for electricity is normally needed throughout the twenty-four hours because less power is used at dark, in other to fit this fluctuation in demand, Dinorwig power station store the extra electricity generated at dark to be used during the twenty-four hours and by so making the works can provide electricity to the national Grid and the power Federal from the Grid can be used to reload the reservoirs. Besides Dinorwig power station can be brought to a standby extremum capacity in 12 seconds providing electricity to the national grid on a day-to-day footing and besides supplying back-ups for periods of heavy demands.

The economic sciences of runing the power station

The economic sciences includes the entire costing of the undertaking which is about ?425 million and it took approximately 10 old ages to finish the edifice of the full site and besides the electricity needed to pump the H2O from the upper reservoir to the lower reservoir is been paid though it is normally bought at a cheaper rate from the grid during off-peak hours and is sold back to the national grid during the twenty-four hours, thereby doing some net incomes in running the power station. Some other cost includes the recreational developments of the country, maintaining of the H2O quality for the saving of this historical site and protecting the aquatic/wildlife within the station.


Energy plays a critical function in our modern economic system of which this energy system faces new challenges in seeking to run into up the mark of the u K policy and statute law of white paper in making low C economic system by 2020 i.e. 20 % renewable energy. The Dinorwig power station emits C dioxide when H2O is being pumped during off peak hours thereby bring forthing less carbon dioxide comparison to other power bring forthing beginnings.


  • Directorate-General for energy and conveyance ( 2009 ) Legislation U k-energy white paper: our energy future-creating a low C economic system [ online ] Available: hypertext transfer protocol: // ( accessed December 10 2009 )
  • The dinorwig slate prey ( 2009 ) [ on-line ] Available: hypertext transfer protocol: // # History ( accessed December 8 2009 )
  • University of Glamorgan – Prifysgol Morgannwg