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Protection of Transformer by Differential Relay
Jára, Jaroslav ; Haluzík, Evžen (referee) ; Toman, Petr (advisor)
This bachelor’s thesis deals with transformer failures and principles of their protection and a design of differential protection of transformers. The first part details with transformer failures, classification of these failures, short-circuit ground faults types, causes of the short-circuit occurrences and consequences of oil-transformer failures. The second part deals with problems of protection in general with the description of protection function, requirements of protection such as selectivity, speed of response, sensitivity and protection classification, methods of protection according to failure type - size of nominal power of transformers. It further describes principle of differential protections. Finally there are previews of historical and modern protections. The third part describes a design of differential protection of transformers. It includes short-circuit ratio calculation, example of three phase short-circuit calculation, CT ratio check, actual setting of protection and setting evaluation.
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Protection of Transformer by Differential Relay
Jára, Jaroslav ; Haluzík, Evžen (referee) ; Toman, Petr (advisor)
This bachelor’s thesis deals with transformer failures and principles of their protection and a design of differential protection of transformers. The first part details with transformer failures, classification of these failures, short-circuit ground faults types, causes of the short-circuit occurrences and consequences of oil-transformer failures. The second part deals with problems of protection in general with the description of protection function, requirements of protection such as selectivity, speed of response, sensitivity and protection classification, methods of protection according to failure type - size of nominal power of transformers. It further describes principle of differential protections. Finally there are previews of historical and modern protections. The third part describes a design of differential protection of transformers. It includes short-circuit ratio calculation, example of three phase short-circuit calculation, CT ratio check, actual setting of protection and setting evaluation.
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