Seismic Analysis of Power Resistor Bank for Cressall Resistors Ltd

Earthquake shock waves radiate from the fault fracture zone and arrive at the earth?s surface as a complex broadband vibratory ground motion, having both horizontal and vertical components. The response of structures to earthquake ground motion depends on their strength, ductility and dynamic properties. Lightly damped structures having one or more natural modes of oscillation within the frequency band of ground excitation can experience considerable amplification of the forces, component stresses, and deflections which can result in irreparable damage. DC White were contacted by Cressall Resistors when they required a design substantiation of a power resistor bank against the seismic shock requirements of IEEE 693?2005; an international standard specifying recommended practice for seismic design of substations; to meet customer specific site requirements. Many items of resistor bank equipment are constructed from brittle, relatively low strength and lightly damped materials. The primary areas of concern are the insulators and resistor bushes which are particularly vulnerable. DC White built a finite element (FE) model of the resistor bank using a mix of shell elements for the sheet metal enclosure and solid elements for the insulators and bushes.

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