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Waterkrachtcentrale De Haandrik
In 1987 in the river Vecht, next to the weir 'De Haandrik' in the municipality Gramsbergen, the power company Ijsselmij built a hydropower turbine with an electric power capacity of 100 kW. The project consists of a hydropower turbine and the necessary construction work. The investment amounted to about 1.5 million Dutch guilders (approximately € 700,000). Expectations are that the turbine will generate 530,000 kilowatt-hours of electricity per year; which will be supplied to the public electricity network. Subsidies from the Ministry for Housing, Regional Development and the Environment (non profit) and the Dutch Power Development Company (demonstration project) made the realisation of the project possible.
Moreover; the kind co-operation of the Department of Public Works and the Department of Domains must not go unrecorded. As part of the co-operation with developing countries, the Dutch Government also aims at developing products which in the third world can lead to local economic development. This starting-point prevailed upon developing the water turbine adopted in this project.

As a power company, the ljsselmij wishes to contribute to the afore-mentioned aim by investing in a model project. Upon planning the project, Ijsselmij handled the principle that the project would be executed when the costs of the generated power could be compared with those of generation in conventional power stations. A Government subsidy is therefore required.
In the concession area of Ijsselmij, the weir 'De Haandrik' is, in view of the water flow, the drop height and the necessary constructional facilities, the best possible location for a water turbine. In consultation with the Department of Public Works it was decided to realise the turbine to the left of the weir; looking downstream. The unit is installed on a pile-driven concrete foundation. The turbine is developed and supplied by the Machine Factory Jansen Venneboer b.v. in Wijhe, and equiped with a four-bladed rotor of which the blades are adjustable. The advantage of this adjustability is that the power of the turbine can be optimised to the local conditions as the water quantity and the drop height difference in each situation.

By means of a gearbox, the low rotor speed of 150 revolutions per minute is increased to the required operating speed of the synchronous generator of 1500 revolutions per minute. An automatic control valve enables the power of the turbine to be controlled. This valve is situated in front of the guide blades and replaces the complicated conventional system of adjustment of the guide blades. The function of the valve is the adjustment of the generated power with preservation of the highest possible output. The building height of the turbine could be limited as the diffusor (outlet opening) is also the base of the turbine. This is very important with a limited drop height. In view of the applicability of the turbine in developing countries, special attention was given to the reliability and the low sensitivity to disturbances, together with a favourable price/performance ratio.

The maximum drop height is about 2 meters. Based on the water flow and the drop height, the output of the turbine is estimated at about 530,000 kilowatt-hours per year; which means that it can be compared with the consumption of electricity of about 180 families.
For maintenance and control purposes, a building was erected on top of the turbine. This building also contains a working space for the Department of Public Works, and a transformer kiosk
 

Technical data:
 

General:
location Weir "De Haandrik", Gramsbergen
setting: left of the weir
drop heigth: approx. 2 meters
water flow: nominal 7 m3/s
output: 530.000 kWh/year
Generator data
manufacture. type: Stanford SC 344 B synchronous
power: 165 kVA
voltage: 380 V
frequency: 50 Hz
drive: 1500 tpm via cardan shaft
Turbine data
manufacturer: Jansen Venneboer
type RR 1600
propellor diameter: 1.6 m
work speed: 150 rpm
rotor blades 4 aluminium bronze
gear box 2-stage
shaft power 110 kW
weight: 17,000 kg

Source: leaflet Ijsselmij (March 1988)

Generated power

kWh

 
Expected
1988
1989
1990
 1991
1992
Total
544,000
298,140
264,450
235,651
149,907
118,700 

Economic data

Initial investment (1988) Fl 1,440,735 
Automatic trash rack (1990) Fl 90,248 
Expected maintenance Fl 10,000/year 


year
operation costs
income 
 
(guilders)
(guilders) 
1988
29,000
14,000 
1989
17,000
12,000 
1990
19,000
18,000 
1991
12,000
7,000 
(source:http://194.178.172.86/register/datare/ccr01618.htm)


Comments and remarks to Wim Jonker Klunne