Ferroresonance in an 88kv network

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dc.contributor.author Gosai, Tejin
dc.date.accessioned 2006-02-14T12:42:37Z
dc.date.available 2006-02-14T12:42:37Z
dc.date.issued 2006-02-14
dc.identifier.uri http://hdl.handle.net/10539/189
dc.description Master of Science in Engineering - Engineering en
dc.description.abstract An investigation was conducted on the failures of 88kV line surge arrestors at an Eskom Distribution substation. The surge arrestor failed when one phase of the transmission line was open circuited and all three phases were not isolated by the protection relays. The transformer was lightly loaded and a surge arrestor blocked the neutral path to the ground. The investigation used a modified version of an equivalent circuit proposed by Marti [1]. Transformer magnetising losses, the non-linear resistance of the neutral surge arrestor and the transformer magnetising reactance of the closed-circuit phases were all included. The investigation revealed that the failure of the arrestor was due to the combined volt drops across the open circuited phase of the transformer magnetising reactance and the neutral surge arrestor. A resonance condition lowered the magnetising reactance of the open circuited phase of the transformer and forced the transformer into saturation. This resonance is characteristic of the fundamental frequency ferroresonance condition [2]. en
dc.format.extent 470724 bytes
dc.format.mimetype application/pdf
dc.language.iso en
dc.subject ferroresance en
dc.subject network en
dc.subject 88kv en
dc.title Ferroresonance in an 88kv network en
dc.type Thesis en

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