Rellswerk

Rellswerk
Construction site of the power plant in Rellstal at 1446 m.
location
Coordinates	47 ° 4 '36 "  N , 9 ° 48' 6"  E Coordinates: 47 ° 4 '36 "  N , 9 ° 48' 6"  E
country	Austria  Vorarlberg
place	Vandans
Waters	Rellsbach, Lünbach (Vilifaubach), Zaluandabach, Lünersee
Kilometers of water	km 0.00 (Rellsbach)
Height upstream	1460  m
power plant
owner	illwerke vkw AG
operator	illwerke vkw AG
Start of planning	2008 (1980s)
construction time	2014-2017
Start of operation	2018
technology
Bottleneck performance	10.4 megawatts
Average height of fall	441 to 521 m
Expansion flow	about 2.47 to 2.6 m³ / s
Standard work capacity	18 million kWh / year
Turbines	1
Generators	1
Others
Website	www.illwerkevkw.at

The power station shaft at kilometers 6.30 under construction.

Confluence and rake / gate structures of the new power plant.

Power plant group Obere Ill-Lünersee Schematic representation

Transfer from the Brandner Glacier 2480  m above sea level A. Ill origin ( Ochsentaler Glacier ) 2460  m Tributaries Silvretta reservoir 2030  m Drain to Ill  |  Lünersee 1970  m Tributaries Kleinvermunt pumping station 1670  m Stream crossing Fasulbach and Rosanna Kops reservoir 1809  m Obervermuntwerk I 1743  m Transfer Kops-Vermunt with tributaries Tributaries Vermuntsee 1743  m Lockroom salonies 1690  m Obervermuntwerk II 1655  m Rells-, Vilifau- and Zaluandabach tributaries Storage basin rells 1456  m Rellswerk 1430  m Kopswerk II   |   Kopswerk  I   |   Vermuntwerk 1025  m Partenen compensation pool 1025  m Free-flow tunnel Partenen-Latschau Rifawerk 1005  m Rifa compensation pool 1007  m Tributaries Garnera, Vermilbach, Suggadin Lünerseewerk 992  m Latschau reservoir 992  m Latschauwerk 985  m Rodundwerk I   |   Rodundwerk II 645  m Inflow from Ill Rodund basin  I to III 645  m Drain to Ill Alvier tributary Inflow quantity Walgauwerk 492  m Walgau compensation basin 492  m Drain to Ill

The Rellswerk is a pumped storage power plant of illwerke vkw AG in the Austrian Montafon and belongs to the “Obere Ill-Lünersee” plant group. The Rellswerk was put into operation on September 28, 2018.

history

Already in the 1980s there were plans to use the slope of the upper Rellsbach in the Rellstal ( Vandans , Montafon ) near the Mariahilfkapelle for the Lünerseewerk (project Vilifau pumping station with 8 MW pumping capacity).

In 2006, a private group planned a small Rells power station and submitted it for a preliminary examination under water law. This power plant would have been designed for an output of 1  MW (around 3 GWh / year). The project was not implemented.

On July 8, 2009, the Vorarlberger Illwerke submitted an application to the Vorarlberg Provincial Government for approval in accordance with Section 5 (1) of the Environmental Impact Assessment Act 2000 (UVP-G 2000) for the construction and operation of the Rellswerk in Vandans. On May 4, 2010, the corresponding approval was granted subject to conditions.

The official groundbreaking was on July 30, 2014.

Preparatory work began on July 10, 2012 below the Rellser Mariahilfkapelle in Rellstal (construction of the lock chambers in the rear Saloniental).

The Rellswerk was put into operation on September 28, 2018.

Rellswerk

The power plant consists of the water pipeline of the Lünbach (Vilifaubach) and the Zaluanda stream (max. 1.5 m ³ / s), the Rells storage basin, the Rells powerhouse, the Salonie pressure pipeline and the Salonie barrier chamber with integration into the Salonie valley through the existing headwaters of the Lünerseewerk .

The Rellswerk is operated by remote control from the icc ( illwerke vkw control center ) in Vandans .

Power house

The power house is integrated with four basement floors in the valley floor and in the upper area (ground floor) in the artificial dam of the Rells storage basin (shaft power house, shaft bottom about 1428 m above sea level, total depth about 15.50 m). This means that only the access portal is visible from the outside. In the power house itself, the motor generator, the transformer and the necessary electrotechnical and other necessary ancillary systems are housed.

The 20 kV system, the control technology as well as the office and social rooms are located in the first basement; on the second basement floor the motor generator including control technology, a battery room and the building services system; in the third basement the pump spiral, the pump ball valve, control system, hydraulic unit etc; The inlet pipe, the shut-off valve and the bilge pump are housed in the fourth basement .

The Rellswerk pumps the water temporarily stored in the Rells basin into the Lünersee .

Technical specifications

The data presented here are based on the provisionally planned variant before the installation and testing of the components:

• Unregulated vertical-axis pump turbine (3-stage / 1-flow pump turbine):
  • Nominal turbine output 10.4 MW,
  • Mechanical power 9.34 MW
  • Nominal pump output 13.2 MW,
  • Engine power consumed 13.75 MW
• Start-up time from standstill turbine operation and pump operation approx. 60 s,
• Speed ​​(constant) 1000 / min,
• Water flow (pump or turbine) about 2.47 to 2.6 m ³ / s,
• Net usable head height 454.50 m,
• Net head 527.70 m,
• maximum head about 540 m,

Lines, transformation

The Rellswerk is connected to the grid via an existing 8 km long underground cable (20 kV line) from Rodundwerk I in Vandans via a 20 MVA network coupling transformer (110 kV network) to the transformer station in Rellstal.

Due to the seasonal fluctuations in network consumption in the Vandans, Tschagguns and Golm areas , the power connection of the Rellswerk to the transformer of the Rodundwerk is limited.

Hydraulic data

Storage basin rells

The oval, kidney-like storage basin Rells is located about 90 m northeast of the confluence of the Zaluanda stream and the Lünbach (Vilifaubach) to the Rellsbach at about 1450 m above sea level. right of the Rellsbach and consists of homogeneous embankments with a water-side surface seal (foil seal). The outlet structure and the power house adjoining it on the valley side are located on the eastern side of the storage basin.

• Longitudinal extension in a southwest-northeast direction about 140 m,
• greatest width about 90 m,
• Congestion destination 1456.0 m above sea level,
• Lowering target 1449.0 m above sea level,
• Dam crest 1457.0 m above sea level,
• maximum dam height about 14.4 m,
• drivable dam crest approximately 4 m wide,
• Storage basin bottom 1453.6 to 1447.1 m above sea level,
• Bottom outlet at the lowest southeastern floor point of the basin at 1,447.1 m above sea level in the Rellsbach,
• Dam cubature (support structure) about 32,000 m ³ .
• Total volume (pool volume) 45,350 m ³ ,
• Usable volume 44,000 m ³ ,
• The surface of the basin at the dam destination is about 9,880 m ²
• surge-free flood relief over the dam crest at 1456.0 m above sea level in the Rellsbach,
• Inflow and outflow
  • fastest filling of the storage basin with maximum natural inflow and pump operation: 3 hours,
  • Filling of the storage basin only through natural inflow: 8 hours,
  • fastest emptying of the storage basin with maximum inflow: 11 hours,
  • fastest emptying of the storage tank without natural inflow to the lowering target: 5 hours,
  • Maximum pumping capacity from the storage basin into the Lünersee: 174,000 m ³ / day.

The Tannlegertobel is located above the end of the basin outward of the valley. To protect against mudslides, a protective wall was built above the basin (made of around 7,000 m ^{3 of} natural debris).

Penstock salonies

From the Rells powerhouse to the existing Salonien valley culvert (barrier chamber Salonien), an underground pressure pipeline with a length of approx. 2310 m is being built for the headrace (mean gradient 11%). The pipeline is designed with a maximum diameter of 1.2 m and covered with 1.2 m so that it is laid frost-proof.

• Rated pressure about 72 bar (Rells basin),
• inclined length of the pressure pipe approx. 2310 m,
• Difference in altitude 258.50 m.

The 22.9 million m ^{3 of} water per year available to the ecosystem over the upper part of the Rellsbach will be reduced to a doping water output of 72 l / s for the Rellsbach. This means about 5.9 million m ^{3 of} water per year that remain in the Rellsbach as doping water or as overflow. "For the existing Rellsbach catchment (lower part of the Rellsbach) this means that instead of the current 27.5 million m ³ / year, only 10.5 million m ³ / year can be drawn in."

Latschau reservoir

So far, at about 1000 m above sea level water introduced into the Latschau reservoir through a transfer tunnel of the existing lower Rellsbach catchment . In the future, this water will mainly be processed by the upper Rellsbach catchment from the Lünersee via the headwaters of the Lünersee into the Latschau reservoir.

Web links

Commons : Rellswerk  - collection of images, videos and audio files

• Rellswerk - illwerkevkw.at
• ENVIRONMENTAL COMPATIBILITY TEST Rellswerk Vorarlberger Illwerke AG
• Illwerkeprojekt Rellswerk

Individual evidence

1. ↑ Illwerke / VKW puts Rellswerk into operation on ORF-Vorarlberg from September 28, 2018, accessed on September 28, 2018
2. ↑ Vorarlberger Nachrichten of July 31, 2014, D1.
3. ↑ Illwerke / VKW puts Rellswerk into operation on ORF-Vorarlberg from September 28, 2018, accessed on September 28, 2018
4. ↑ In order to maintain emergency operation, the power plant has an emergency power unit with around 150 kW in order to be able to continue operating the bottom discharge gate, the inlet gate, the bilge pumps etc.
5. ↑ There is no rapid changeover between pump and turbine operation, which is why a surge tank was not used.
6. ↑ Embankment material is the bulk material extracted from the lateral moraine of the southern embankment to be removed.
7. ↑ According to ENVIRONMENTAL COMPATIBILITY TEST Rellswerk Vorarlberger Illwerke AG , p. 23, the storage basin is to be emptied approximately once a year via the bottom outlet pipe.
8. ↑ Environmental impact assessment Rellswerk Vorarlberger Illwerke AG , p. 44.
9. ↑ ENVIRONMENTAL COMPATIBILITY TEST Rellswerk Vorarlberger Illwerke AG , p. 81.