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Reliability and efficiency from the renewal of electrical and automation systems at the Raasakka power plant

New electrical and automation systems have been commissioned at the Raasakka hydropower plant operated on the Iijoki river by Pohjolan Voima’s hydropower company PVO-Vesivoima. The modernisation improves the reliability of the power plant and provides a boost to load-following capacity.

The modernisation project constituted replacing the previous systems, dated from the 1970s, with up-to-date digital technology. The work began in summer 2018, and the new systems were commissioned at the end of the year. The renewal will secure the power plant’s production and control functions for the next 15 or 20 years.

-       “The detailed condition monitoring data produced by the new systems will improve the availability of the plant. The digital equipment will also enhance the power plant’s control properties, which will boost the plant’s ability to produce load-following capacity that provides important balance to the national power supply”, says development manager Juha Kähkölä from PVO-Vesivoima Oy.

Accurate condition monitoring and enhanced energy efficiency

The modern systems mean easier condition monitoring and better availability of spare parts. They produce more detailed data on the condition of the systems and improve the plant’s potential for proactive maintenance. Plant functionalities can also be adjusted remotely.  

The new technology also boosts the plant’s energy efficiency.

-       “We used up-to-date technology to replace systems that had reached the end of their operating life. The new plant and machine automation is also more energy efficient than the old systems. The automation system controls the power plant's switching stations, water levels and the three turbines and generators in more detail than before, with real-time data”, says Kähkölä.

The 10 kV switching station was also replaced during the project, and the turbines and generators received an overhaul. The new electricity and automation systems were supplied by ABB. Electrical installation was managed by Paikallis-Sähkö Oy. PVO’s maintenance partner Caverion carried out overhaul work.

The investment is part of a systematic renovation programme for Pohjolan Voima’s hydropower plants. Work carried out in recent years includes the renewal of electrical automation at the Isohaara power plant on Kemijoki river in 2016–2017 and the overhaul of the Melo power plant on Kokemäenjoki river in 2014–2015. A major renovation programme involving four power plants was completed on Iijoki river in 2013.

Modernisations add several decades to the service lives of the hydropower plants. Their ability to produce just-in-time load-following power to support the increased wind and solar power capacities also improves, which allows the continuing adoption of an emission-free energy system.

Further information: Juha Kähkölä, Development Manager, PVO-Vesivoima, tel. +358 10 478 622

PVO-Vesivoima Oy produces electricity with its hydropower plants on the Iijoki, Kemijoki and Kokemäenjoki rivers. The average total annual energy production output of the company is 1.7 TWh. The company is part of the Pohjolan Voima Group. Twitter: @PVOVesivoima