The reliability and maintainability of the transmission transformers in South Africa
- Authors: Molabe P.P.
- Date: 2018
- Subjects: Eskom (Firm) , Electric transformers - South Africa - Maintenance and repair , Electric insulators and insulation , Electric power transmission , Electric power supplies to apparatus
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/286013 , uj:30941
- Description: M.Phil. (Engineering Management) , Abstract: The power utilities have the challenging task of supplying electricity and meeting stakeholders expectations with constrained resources. Like other power utilities, Eskom has a mandate of generating and distributing electricity in a safe, reliable and cost-effective ways. The success and failure of the South African power utility are depended on the capabilities of the transformers and the maintenance strategies adopted to support the systems. This study presents the finding of the reliability and maintainability analysis of the transmission transformers in Eskom from the period of 2014 to 2016. The study used statistical methods to analyse secondary data from Eskom operational records and reports. During the period of analysis, Eskom experienced twenty-nine failures related to transmission transformers. The study shows that Eskom was operating with the ageing transmission transformers, the protection system and bushings came out as dominating causes for malfunctions. It is recommended that Eskom change the maintenance strategy and focus on replacing the high failing component or systems to improve reliability.
- Full Text:
- Authors: Molabe P.P.
- Date: 2018
- Subjects: Eskom (Firm) , Electric transformers - South Africa - Maintenance and repair , Electric insulators and insulation , Electric power transmission , Electric power supplies to apparatus
- Language: English
- Type: Masters (Thesis)
- Identifier: http://hdl.handle.net/10210/286013 , uj:30941
- Description: M.Phil. (Engineering Management) , Abstract: The power utilities have the challenging task of supplying electricity and meeting stakeholders expectations with constrained resources. Like other power utilities, Eskom has a mandate of generating and distributing electricity in a safe, reliable and cost-effective ways. The success and failure of the South African power utility are depended on the capabilities of the transformers and the maintenance strategies adopted to support the systems. This study presents the finding of the reliability and maintainability analysis of the transmission transformers in Eskom from the period of 2014 to 2016. The study used statistical methods to analyse secondary data from Eskom operational records and reports. During the period of analysis, Eskom experienced twenty-nine failures related to transmission transformers. The study shows that Eskom was operating with the ageing transmission transformers, the protection system and bushings came out as dominating causes for malfunctions. It is recommended that Eskom change the maintenance strategy and focus on replacing the high failing component or systems to improve reliability.
- Full Text:
Electric load forecasting for holiday periods
- Authors: Godden, Kieran Richard
- Date: 2012-08-22
- Subjects: Electric power-plants - Load , Electric power systems - Load dispatching , Forecasting - Statistical methods , Electric power supplies to apparatus
- Type: Mini-Dissertation
- Identifier: uj:3015 , http://hdl.handle.net/10210/6437
- Description: M.Sc. , The Christmas and Easter holiday periods have a large influence on electricity load. Forecasting the load for these periods is difficult since the changes in the load patterns are sudden and substantial. Furthermore, the effects of these periods on the load patterns are dependent on the timing of Easter and the weekday composition of Christmas, which change from year to year. A strategy is presented to forecast the hourly electricity load for these holiday periods as well as the periods shortly afterward. This strategy is based on a general fixed structure ARIMA model developed to forecast the hourly load for periods with no unusual load activity. The general model is supplemented by information on the two holiday periods, extracted from the corresponding periods in historical years by means of growth independent scale factors. A model for forecasting the total weekly load is also presented. This model makes use of intervention techniques to account for the changes in the load due to the Christmas and Easter holiday periods. The forecasting methodologies are all geared towards practical application and are suitable for on-line implementation.
- Full Text:
- Authors: Godden, Kieran Richard
- Date: 2012-08-22
- Subjects: Electric power-plants - Load , Electric power systems - Load dispatching , Forecasting - Statistical methods , Electric power supplies to apparatus
- Type: Mini-Dissertation
- Identifier: uj:3015 , http://hdl.handle.net/10210/6437
- Description: M.Sc. , The Christmas and Easter holiday periods have a large influence on electricity load. Forecasting the load for these periods is difficult since the changes in the load patterns are sudden and substantial. Furthermore, the effects of these periods on the load patterns are dependent on the timing of Easter and the weekday composition of Christmas, which change from year to year. A strategy is presented to forecast the hourly electricity load for these holiday periods as well as the periods shortly afterward. This strategy is based on a general fixed structure ARIMA model developed to forecast the hourly load for periods with no unusual load activity. The general model is supplemented by information on the two holiday periods, extracted from the corresponding periods in historical years by means of growth independent scale factors. A model for forecasting the total weekly load is also presented. This model makes use of intervention techniques to account for the changes in the load due to the Christmas and Easter holiday periods. The forecasting methodologies are all geared towards practical application and are suitable for on-line implementation.
- Full Text:
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