Dynamic compensation for performance characteristic differences of wind generator coupled pumps
- Swanepoel, Pieter Frederick Renier
- Authors: Swanepoel, Pieter Frederick Renier
- Date: 2000
- Subjects: Wind pumps
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10806 , http://hdl.handle.net/10948/25 , Wind pumps
- Description: The lack of services such as electricity in the rural areas of South Africa has given rise to the use of pump water and the windmills. The ones in use currently are maintenance intensive. There is a corrosive element in water and this sometimes requires plastic or other non-corrosive materials to be used for pump components and pipes. Solar panels are expensive and have low efficiencies. Alternative energy systems such as diesel engine driven- mono pumps or -turbines or windmills are costly, which means that the overall efficiency must be maximized to reduce these costs.
- Full Text:
- Date Issued: 2000
- Authors: Swanepoel, Pieter Frederick Renier
- Date: 2000
- Subjects: Wind pumps
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10806 , http://hdl.handle.net/10948/25 , Wind pumps
- Description: The lack of services such as electricity in the rural areas of South Africa has given rise to the use of pump water and the windmills. The ones in use currently are maintenance intensive. There is a corrosive element in water and this sometimes requires plastic or other non-corrosive materials to be used for pump components and pipes. Solar panels are expensive and have low efficiencies. Alternative energy systems such as diesel engine driven- mono pumps or -turbines or windmills are costly, which means that the overall efficiency must be maximized to reduce these costs.
- Full Text:
- Date Issued: 2000
Handheld infrared CO2 gas detector
- Authors: Coetzee, George
- Date: 2000
- Subjects: Gas-detectors , Infrared detectors , Water quality -- Measurement
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10807 , http://hdl.handle.net/10948/28 , Gas-detectors , Infrared detectors , Water quality -- Measurement
- Description: A handheld InfraRed (IR) Carbon Dioxide (CO2) gas detector was developed and used to carry out a study of water and urine samples in South Africa. The details of the model and the results of the study are discussed here. The overseas markets are not geared for the current South African conditions. Use is made of components that can be obtained locally. Imported components are very expensive and should an imported model be damaged, it has to be returned overseas to be repaired. As an illustration of this technology it was decided to perform research in water technology and then develope a handheld Infrared CO2 gas detector based prototype which would: highlight the benefits of using handheld IR CO2 gas detectors; be built locally; be powered by a 12 Volt supply; be very easy to maintain; and be cost effective. Experimental results on the accuracy and stability of the instrument formed part of this study. The IR CO2 Gas detector that was developed was used throughout the project as a prototype and testing vehicle for numerous designs. It proved to be superior to the current imported commercial instruments in terms of size, cost effectiveness and user friendliness. A further advantage of the instrument is its robustness.
- Full Text:
- Date Issued: 2000
- Authors: Coetzee, George
- Date: 2000
- Subjects: Gas-detectors , Infrared detectors , Water quality -- Measurement
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10807 , http://hdl.handle.net/10948/28 , Gas-detectors , Infrared detectors , Water quality -- Measurement
- Description: A handheld InfraRed (IR) Carbon Dioxide (CO2) gas detector was developed and used to carry out a study of water and urine samples in South Africa. The details of the model and the results of the study are discussed here. The overseas markets are not geared for the current South African conditions. Use is made of components that can be obtained locally. Imported components are very expensive and should an imported model be damaged, it has to be returned overseas to be repaired. As an illustration of this technology it was decided to perform research in water technology and then develope a handheld Infrared CO2 gas detector based prototype which would: highlight the benefits of using handheld IR CO2 gas detectors; be built locally; be powered by a 12 Volt supply; be very easy to maintain; and be cost effective. Experimental results on the accuracy and stability of the instrument formed part of this study. The IR CO2 Gas detector that was developed was used throughout the project as a prototype and testing vehicle for numerous designs. It proved to be superior to the current imported commercial instruments in terms of size, cost effectiveness and user friendliness. A further advantage of the instrument is its robustness.
- Full Text:
- Date Issued: 2000
Replacement of seven 132/66 kv distance protection schemes by means of a generic relay implemented as a strategic spare
- Authors: Harris, Raymond Trevor
- Date: 2000
- Subjects: Protective relays , Electric power systems -- Protection
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10808 , http://hdl.handle.net/10948/34 , Protective relays , Electric power systems -- Protection
- Description: Eskom is experiencing problems in the field of protection maintenance and in-service breakdowns which negatively influence the quality of electrical supply to the consumer, an integral component of the utility business. These facts initiated the research into the further development of a generic relay to be implemented as a strategic spare for the replacement of several schemes operating within Eskom’s southern region. These include the electromechanical, solid state and numerical distance protection relay and scheme failures on the 132 / 66 kV feeder network. Hence, the primary objective of the research is to develop, test and configure the strategic spare in terms of software and peripheral hardware for the input and output terminal connections, generic equations and settings for the purpose of the scheme replacements. The various schemes are assessed for stepped distance and permissive intertripping for three or single pole operation. This is done in conjunction with the internal and external circuit diagrams in order to understand the detailed operation of the scheme and to ensure the effective implementation of the strategic spare. The generic relay is configured for the emergency replacement of the various schemes during in-service breakdowns. This constitutes a temporary installation and therefore the downtime in essence, of all the distance protection schemes that require replacement, is limited to a minimum. This dissertation therefore explores the implementation of the strategic spare.
- Full Text:
- Date Issued: 2000
- Authors: Harris, Raymond Trevor
- Date: 2000
- Subjects: Protective relays , Electric power systems -- Protection
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10808 , http://hdl.handle.net/10948/34 , Protective relays , Electric power systems -- Protection
- Description: Eskom is experiencing problems in the field of protection maintenance and in-service breakdowns which negatively influence the quality of electrical supply to the consumer, an integral component of the utility business. These facts initiated the research into the further development of a generic relay to be implemented as a strategic spare for the replacement of several schemes operating within Eskom’s southern region. These include the electromechanical, solid state and numerical distance protection relay and scheme failures on the 132 / 66 kV feeder network. Hence, the primary objective of the research is to develop, test and configure the strategic spare in terms of software and peripheral hardware for the input and output terminal connections, generic equations and settings for the purpose of the scheme replacements. The various schemes are assessed for stepped distance and permissive intertripping for three or single pole operation. This is done in conjunction with the internal and external circuit diagrams in order to understand the detailed operation of the scheme and to ensure the effective implementation of the strategic spare. The generic relay is configured for the emergency replacement of the various schemes during in-service breakdowns. This constitutes a temporary installation and therefore the downtime in essence, of all the distance protection schemes that require replacement, is limited to a minimum. This dissertation therefore explores the implementation of the strategic spare.
- Full Text:
- Date Issued: 2000
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