• Home
  • André Abgottspon
André Abgottspon

André Abgottspon
etaeval GmbH

MSc
Managing Director at etaeval GmbH

About

45
Publications
19,049
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
249
Citations

Publications

Publications (45)
Article
Full-text available
Turbinen von Hoch- und Mitteldruck-Wasserkraftanlagen können bekanntlich durch Schwebstoffpartikel im Wasser stark abgenutzt werden, was zu erheblichen Unterhaltskosten, Wirkungsgradabnahmen, Minderproduktion und somit zu Ertragseinbussen führt. Diese Problematik wurde am Hochdruck-Laufwasserkraftwerk Fieschertal (Wallis) in einem Forschungsprojekt...
Article
Full-text available
Geometrical changes and material loss of Pelton turbine runners as well as changes in turbine efficiency have been measured at HPP Fieschertal in Valais, Switzerland since 2012. The HPP is equipped with two horizontal axis Pelton units, with each 32 MW nominal power, 7.5 m ³ /s design discharge, 515 m head and two injectors. The nozzles and the buc...
Article
Full-text available
Hydro-abrasive erosion on hydraulic turbines is economically and energetically important. To better understand the causes and consequences of turbine erosion and to further develop mitigation measures, the suspended sediment concentration (SSC) and size distribution of mineral particles in the turbine water of the 64 MW high-head run-of-river hydro...
Conference Paper
Full-text available
Geometrical changes and material loss of Pelton turbine runners as well as changes in turbine efficiency have been measured at HPP Fieschertal in Valais, Switzerland since 2012. The HPP is equipped with two horizontal axis Pelton units, with each 32 MW nominal power, 7.5 m3/s design discharge, 515 m head and two injectors. The nozzles and the bucke...
Conference Paper
Hydro-abrasive erosion on hydraulic turbines is economically and energetically important. To better understand the causes and consequences of turbine erosion and to further develop mitigation measures, the suspended sediment concentration (SSC) and size distribution of mineral particles in the turbine water of the 64 MW high-head run-of-river hydro...
Article
Full-text available
In Hoch- und Mitteldruck-Laufwasserkraftanlagen unterstrom von Gletschern sind die Turbinen besonders von hydro-abrasivem Verschleiss betroffen. An einer solchen Anlage wurden Instrumente eingebaut, mit denen die Schwebstoffbelastung laufend gemessen wird, um den Betrieb wirtschaftlich zu optimieren.
Conference Paper
Full-text available
Many rivers worldwide transport fine sediment particles at least in some periods of the year and particularly after intense rainfall. To reduce sediment problems, intakes of hydropower plants (HPPs) or irrigation schemes may be closed for limited time if the suspended sediment mass concentration (SSC) exceeds a threshold during a flood. As a basis...
Conference Paper
Full-text available
The power plant of Filisur has recently been equipped with a condition monitoring system to survey the real time efficiency as well as its history. In addition, a large number of site specific characteristics are acquired and stored to a database with a sampling rate of 1 Hz. All these data can be analysed on demand over a period of at least three...
Article
Hydro-abrasive erosion in hydraulic turbines is a well-known problem, but comprehensive data sets from hydropower plants (HPP) are still rare. Therefore, the sediment load, erosion depths and efficiency changes have been measured and evaluated since 2012 in a high-head run-of-river HPP in the Swiss Alps. An erosion model for hard-coated Pelton buck...
Conference Paper
Full-text available
Hydro-abrasive erosion of hydraulic turbines is an economically important issue due to maintenance costs and production losses. The topic is of particular importance at high-and medium-head run-of-river hydropower plants (HPPs). To address this issue, a comprehensive research study has been conducted at the case study HPP Fieschertal, in the Alps o...
Conference Paper
Full-text available
Many reservoirs worldwide are negatively affected by sedimentation. For headwater storages of hydropower plants (HPPs), one countermeasure is to increase the transport of fine sediments through power waterways to downstream river reaches. The suspended sediment concentration (SSC) in the power waterway can be increased by (i) adequate design and op...
Article
Full-text available
Wirkungsgradmessungen für Turbinen und Pumpen in Wasserkraftwerken werden einerseits bei vertraglich geregelten Garantienachweisen benötigt und andererseits für die Bewertung der Wirtschaftlichkeit bei Erneuerungsmassnahmen ausgeführt. Sie erhöhen die Transparenz zwischen Betreiber und Lieferant. Zudem liefern sie wertvolle Erkenntnisse für die Wei...
Article
Full-text available
Hydro-abrasive erosion of hydraulic turbines is an economically important issue due to maintenance costs and production losses, in particular at high- and medium-head run-of- river hydropower plants (HPPs) on sediment laden rivers. In this paper, research and development in this field over the last century are reviewed. Facilities for sediment excl...
Article
Full-text available
At medium- and high-head hydropower plants (HPPs) on sediment-laden rivers, hydro-abrasive erosion on hydraulic turbines is a major economic issue. For optimization of such HPPs, there is an interest in equations to predict erosion depths. Such a semi-empirical equation suitable for engineering practice is proposed in the relevant guideline of the...
Article
Full-text available
At medium- and high-head hydropower plants (HPPs) on sediment-laden rivers, hydro-abrasive erosion in turbines is an important economic issue. In HPPs with headwater storage, reservoir sedimentation is another problem related to fine sediment. On the one hand, turbine erosion is mitigated by reducing the sediment load in power waterways. On the oth...
Article
Full-text available
Geometrical changes and material loss of Pelton turbine runners as well as changes in turbine efficiency were measured at HPP Fieschertal in Valais, Switzerland. The HPP is equipped with two horizontal axis Pelton units, with each 32 MW nominal power, 7.5 m³/s design discharge, 515 m head and two injectors. The injectors and the buckets are hard-co...
Article
Full-text available
Fine sediments are important in the design and operation of hydropower plants (HPPs), in particular with respect to sediment management and hydro-abrasive erosion in hydraulic machines. Therefore, there is a need for reliable real-time measurements of suspended sediment mass concentration (SSC) and particle size distribution (PSD). The following in...
Article
Full-text available
In the scope of a research project on hydro-abrasive erosion of Pelton turbines, a field study was conducted at the high-head HPP Fieschertal in Valais, Switzerland. The suspended sediment mass concentration (SSC) and particle size distribution (PSD) in the penstock have been continuously measured since 2012 using a combination of six measuring tec...
Conference Paper
Full-text available
A case study of discharge measurements with the acoustic transit time method in a rectangular open channel at the intake of the dotation hydro power plant of Pradella, Switzerland is presented. These measurements were performed in the context of efficiency testing of the recently installed turbines. The power plant started operation in 2014 and is...
Conference Paper
Full-text available
Hydro-abrasive erosion of hydraulic turbines is an economically important issue due to maintenance costs and production losses, in particular at high- and medium-head run-of-river hydropower plants (HPPs) on sediment laden rivers. In this paper, research and development in this field over the last century are reviewed. Facilities for sediment exclu...
Conference Paper
Full-text available
Fine sediments are important in the design and operation of hydropower plants (HPPs), in particular with respect to sediment management and hydro-abrasive erosion in hydraulic machines. Therefore, there is a need for reliable real-time measurements of suspended sediment mass concentration (SSC) and particle size distribution (PSD). The following in...
Conference Paper
Full-text available
In the scope of a research project on hydro-abrasive erosion of Pelton turbines, a field study was conducted at the high-head HPP Fieschertal in Valais, Switzerland. The suspended sediment mass concentration (SSC) and particle size distribution (PSD) in the penstock have been continuously measured since 2012 using a combination of six measuring tec...
Conference Paper
Full-text available
At medium- and high-head hydropower plants (HPPs) on sediment-laden rivers, hydro-abrasive erosion on hydraulic turbines is a major economic issue. For optimization of such HPPs, there is an interest in equations to predict erosion depths. Such a semi-empirical equation suitable for engineering practice is proposed in the relevant guideline of the...
Conference Paper
Full-text available
At medium- and high-head hydropower plants (HPPs) on sediment-laden rivers, hydro-abrasive erosion in turbines is an important economic issue. In HPPs with headwater storage, reservoir sedimentation is another problem related to fine sediment. On the one hand, turbine erosion is mitigated by reducing the sediment load in power waterways. On the oth...
Conference Paper
Full-text available
Geometrical changes and material loss of Pelton turbine runners as well as changes in turbine efficiency were measured at HPP Fieschertal in Valais, Switzerland. The HPP is equipped with two horizontal axis Pelton units, with each 32 MW nominal power, 7.5 m 3 /s design discharge, 515 m head and two injectors. The injectors and the buckets are hard-...
Article
Full-text available
Durch schwebstoffhaltiges Wasser kommt es insbesondere bei Hoch- und Mitteldruckwasserkraftanlagen zu hydro-abrasiven Verschleiss an Turbinen und Pumpen mit entsprechenden Wirkungsgradreduktionen. Die Folgen sind erhöhte Unterhaltskosten und Ertragseinbussen. Im Rahmen eines Forschungsprojekts wurden die Schwebstoffbelastung, die Abrasion an Pelton...
Article
Full-text available
La Rance was the first tidal power plant worldwide with a capacity of 240 MW supplied by 24 bulb units working in both flow directions. Many tests had been undertaken in laboratory and on the prototype of Saint-Malo, but no real commissioning tests had been carried out until now. Measuring discharge at La Rance is indeed complex because of a very l...
Article
Full-text available
In the context of a planned retrofit and upgrade of the hydropower plant Wettingen, operated by the Elektrizitätswerke Zürich, three intakes were equipped with acoustic transit time flow measuring devices. Since the flow meters are installed in a converging section, downstream of a pier, it became necessary to perform numerical flow simulations in...
Presentation
Full-text available
Das Niederdruckwasserkraftwerk in Wettingen, Schweiz, ist seit 1933 in Betrieb und eine Zusammenhangsoptimierung war überfällig. Das Ziel der durchgeführten Messkampagne war es Daten für eine Optimierung des Betriebs der Anlage zu finden und auch für eine Kosten/Nutzen-Analyse eines Erneuerungsprojektes.
Conference Paper
Full-text available
In the context of a planned retrofit and upgrade of the HPP Wettingen, operated by the Elektrizitätswerke Zürich, three intakes were equipped with acoustic transit time flow measuring devices. Since the flow meters are installed in a converging section, downstream of a pier, it became necessary to perform numerical flow simulations in order to weig...
Article
Full-text available
Wirkungsgradmessungen in Kleinwasserkraftwerken liefern einen bedeutenden Beitrag zur Förderung der Transparenz zwischen den Kraftwerken (Vergleichsmöglichkeit) und zur Weiterentwicklung von hydraulischen Komponenten. Sowohl gute als auch schlechte Resultate, egal aus welcher Optik, können den Erfahrungsstand der Lieferanten sowie der Betreiber stä...
Article
Full-text available
Sediment in the water passing through hydro turbines can have a signifcant effect on unit effciency. The authors undertook a research project to better understand the interactions between suspended sediment, turbine wear and unit effciency.
Conference Paper
Full-text available
La Rance was the first tidal power plant worldwide with a capacity of 240 MW supplied by 24 bulb units working in both flow directions. Many tests had been undertaken in laboratory and on the prototype of Saint-Malo, but no real commissioning tests had been carried out until now. Measuring discharge at La Rance is indeed complex because of a very l...
Conference Paper
Full-text available
A novel method for evaluation of current meter measurements is presented. This method is especially suited for generally shaped flow cross sections, where the application of procedures described in the international standards are not suitable. The proposed procedure bases on numerical flow simulation with exactly known flow rate and a subtraction o...
Conference Paper
Full-text available
The low head hydro power plant in Wettingen, Switzerland, is in operation since 1933 and no effective cam optimization has been carried out up to now. The goal of the measuring campaign was to provide data enabling an economic study for a retrofit and upgrade project of the plant and the measurement of the efficiency improvement of turbines after r...
Conference Paper
Full-text available
Besides siltation of reservoirs, wear on turbines of hydroelectric power plants (HPP) is an economically important issue related to sediment-laden natural waters. Hydro-abrasive erosion on turbines that is caused by suspended sediment may lead to considerable maintenance and repair costs as well as significant generation losses due to reduced turbi...
Conference Paper
Full-text available
Wear of turbine parts due to abrasive particles in the water of hydroelectric power plants (HPP) is of special importance for Pelton turbines where extreme redirection and deceleration of the flow occurs. In an on-going research project at HPP Fieschertal, Switzerland, wear on coated runner buckets is measured with a 3D optical scanner and a thickn...
Conference Paper
Full-text available
The paper discusses the results of laboratory and field measurements with a commercial type clamp-on acoustic transit time (CATT) flow meter. Experience was gained on the one hand with systematic tests in the laboratory, with and without disturbed flow conditions at various installation positions with varying measurement setups. The flow rate meas...
Conference Paper
Full-text available
Corrective terms to improve the accuracy of the thermodynamic efficiency measurements are proposed in section 14.6 of the IEC standard 60041 – 1991. The following contribution focuses on the corrective term for the specific mechanical energy. The physical background of this correction will be discussed, the equations will be derived and the range o...
Conference Paper
Full-text available
The paper focuses on the comparison of index measurements of a Francis turbine with steady state measuring points and measurements under quasi-steady conditions. This second method is called "sliding gate method" and was introduced by Almquist [2]. It is shown that in spite of large fluctuations of the data an excellent repeatability of the curves...
Conference Paper
Full-text available
This paper addresses two aspects of thermodynamic efficiency measurements on Pelton turbines. On the one hand the results of measurements in the HPP of Sedrun, Soazza and Rabiusa-Realta which all are equipped with two jet horizontal Pelton turbines are presented. For these three plants the differences between upper and lower injector efficiencies f...

Network

Cited By