Computer aided design of protection systems for electrical drives

The contents of this thesis describe the results of an investigation into the means by which computer aided design (CAD) may be applied to the protection systems of electrical drives, removing much of the repetitive procedures presently used in determining relay settings. To further this aim, a series of algorithms have been devised which allow exploitation of the concept. The areas chosen for demonstration are, direct-on-line started induction motors and transformer fed variable speed drives. In both cases "standard settings' cannot be implemented as the field of application varies enormously.<br/><br/>The text discusses an algorithm which utilises several databases containing motor, fuse and cable parameters. Chapter three uses a program derived from this algorithm which allows data to be extracted from the databases and manipulated in order to determine the optimum circuit components.<br/><br/>Subsequent chapters examine the implementation of two types of motor protection relay and discusses the algorithms used in modelling them. The text is supported by applications which demonstrate the effectiveness of the derived programs.<br/><br/>Chapter six discusses in depth the application of overcurrent relays for the protection of transformers used on variable speed drive installations. The possibility of using overcurrent elements in two or three phases is examined together with the attendant difficulties which may arise. The algorithms are further expanded to incorporate applications which involve the protection of multi-transformer installations supplied from a common point.

Name dc:type.qualificationname

Doctoral Thesis

Level dc:type.qualificationlevel

Student thesis

Year dc:date.issued

1994

Author dc:creator

• Dunn, Ian

Language dc:language

eng

Identifier

oai:pure.atira.dk:studenttheses/083070e9-5cde-45e7-8bbd-e25f8f9c4742

OAI identifier oai:identifier

oai:pure.atira.dk:studenttheses/083070e9-5cde-45e7-8bbd-e25f8f9c4742