Martigny-Bourg power station

Martigny-Bourg power station
	location
Coordinates	570669 / 104127 coordinates: 46 ° 5 '17 " N , 7 ° 3' 34" O ; CH1903: 570669 / 104127
country	Switzerland Valais
place	Martigny-Bourg
Waters	Drance
Height upstream	497 m above sea level M.
	power plant
owner	Forces Motrices de Martigny-Bourg SA, subsidiary of Alpiq
construction time	4 years
Start of operation	1908
	technology
Bottleneck performance	13 megawatts
Average ; height of fall	177 m
Expansion flow	10.2 m³ / s
Standard work capacity	89.2 million kWh / year
Turbines	3 × double Francis turbines
	Others
Website	Alpiq
was standing	2018

The power plant Martigny-Bourg is a medium pressure - hydropower plant in Martigny-Bourg in the canton of Valais in Switzerland , which of Alpiq operates.

history

Machine room after the reconstruction in 1945

The power plant was commissioned in 1908 by the operating company Forces Motrices de Martigny-Bourg on behalf of the Société d'Électro-Chimie from Paris. Its main purpose was to supply the nitrogen fertilizer factory in Les Vorziers near Martigny with electricity. In 1922 the power plant was transferred to Energie de l'Ouest Suisse SA (EOS) and from then on also served as a public power supply. In 1944 the 18 machine sets originally installed were replaced by three machine sets.

technology

The water is taken from the Dranse below Sembrancher with a pressure segment weir , flows under the Mont Chemin and is processed at the headquarters in Martigny-Bourg. Originally the water catchment was planned above Bovernier , but while the 2840 m long almost horizontally running inlet tunnel was already under construction, a change in the concession raised it 55 meters higher.

So that the construction work already carried out on the inlet tunnel was not lost, a two-kilometer-long gravity tunnel was created parallel to the Dranse from the new location of the water intake, the end of which is connected to the original inlet tunnel with a 60% inclined pressure shaft. The inlet tunnel, which was originally intended as a gravity tunnel, became a pressure tunnel that is operated at 5.3 bar . At the end of the tunnel is the moated castle and the transition to the 420 m long pressure pipeline to the control center. This runs completely underground in a 42% inclined tunnel. The cross-section of the tunnel is so large that in the event of damage to the pressure pipe it could absorb the entire amount of water and feed it to the underwater area of the power plant.

In 1914, the headquarters in Martigny-Bourg had the following 18 machine sets with Pelton turbines :

Machine sets in 1914
number	Type of electricity generated	tension	frequency	power per machine set	use
9	Direct current	no information		1100 hp	Industry ( aluminum production )
3	Three-phase alternating current	10,000 BC	25 Hz	2500 hp	Industry ( Carbide factory , extraction of sodium and chlorine with fused-salt electrolysis )
1	Single phase alternating current	8,000 BC	15 Hz	1000 hp	Chemins de fer Martigny-Orsières
1	Three-phase alternating current	5,000 V	50 Hz	1100 hp	Power current
2	Three-phase alternating current	5,000 V	50 Hz	500 hp	Martigny-Bourg lighting
2	Direct current	no information		80 hp	Exciter

The total output of the machine sets was 20,660 hp, but the power station could only provide water for 14,000 hp, so that not all machine sets could be operated at the same time.

In 1945 the 18 turbines listed above were replaced by 3 double Francis turbines from Ateliers des Charmilles SA . Each of the turbines has an output of 7.36 MW, but a maximum of 13 MW of electrical output can be delivered to the grid. The power plant was renewed from 2009 to 2013, with the roof of the machine house being equipped with a photovoltaic system that feeds 80,000 kWh into the power grid every year.

Pictures, ca.1926
Inlet structure below Sembrancher
Headquarters
Machine room

literature

H. Chenaud: Les Forces motrices de la Drance à Martigny . In: Bulletin technique de la Suisse romande . 1910.
- Part 1: Description générale des travaux. doi : 10.5169 / seals-81440
- Game 2: Barrage mobile. doi : 10.5169 / seals-81442
- Part 3: Vanne automatique à débit constant. doi : 10.5169 / seals-81447
- Part 4: Conduite métallique sous pression. doi : 10.5169 / seals-81453
- Part 5: Salle des machines. doi : 10.5169 / seals-81458

Web links

Commons : Martigny-Bourg power station - Collection of images, videos and audio files

Individual evidence

↑ ^a ^b No. 484: Usine de Martigny-Bourg. In Switzerland. Departement des lnnern, department for water management (ed.): The water forces of Switzerland . tape 4 , September 1916, p. 354-355 .

↑ Central No. 506400: Martigny-Bourg . In: Office fédéral de l'energie, Section Force hydraulique (ed.): Statistique des aménagements hydroélectriques de la Suisse .

↑ Martigny-Bourg run-of-river power station. Alpiq, accessed on April 17, 2019 .

[:0-1] No. 484: Usine de Martigny-Bourg. In Switzerland. Departement des lnnern, department for water management (ed.): The water forces of Switzerland . tape 4 , September 1916, p. 354-355 .

[2] Central No. 506400: Martigny-Bourg . In: Office fédéral de l'energie, Section Force hydraulique (ed.): Statistique des aménagements hydroélectriques de la Suisse .

[3] Martigny-Bourg run-of-river power station. Alpiq, accessed on April 17, 2019 .