Power Research

N. Srujana ¹, R. Panneer Selvam ², R. Ramesh Babu ³, Katta Venkataramana ⁴

Affiliations
1 PhD Student, Dept. of Civil Engineering, NITK, Mangalore-575 025, IN
2 EngineeringOfficer, Earthquake Engineering & Vibration Research Centre, CPRI, Bangalore, 560 080, IN
3 Additional Director, Earthquake Engineering & Vibration Research Centre, CPRI, Bangalore, 560 080, IN
4 Professor, Dept. of Civil Engineering, NITK, Mangalore- 575 025, IN

Abstract

The support structure of a surge arrester within the substation is considered for the experimental and finite element study. Support structures are generally used in a substation mainly for the electrical ground clearance purposes but also it protects the mounting equipment with respect to earthquake loads. The paper is aimed to find out the acceleration amplification levels at base of the support structure at severe earthquake loadings even when it is mounted on steel support structures. Seismic tests are carried out experimentally on shake table. The behavior of the support structure is found satisfactory. No material losses are resulted. Finite element studies are also included in the paper. The finite element model predictions are agreeable to the experimental results.

Keywords

Surge Arrester, Ground Motion Amplification, Shake Table Tests.

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R. Panneer Selvam ¹, Yamini Gupta ¹, D. Nagesh Babu ¹

Affiliations
1 Central Power Research Institute, Bengaluru – 560010, Karnataka, IN

Abstract

Switchgear and controlgear plays a vital role in electrical power distribution system. Switchgear and controlgear are designed for electrical performance requirements including short circuit, temperature and humidity environmental conditions. But design aspects due to a seismic event are usually not taken into consideration. Earthquake shock waves causes vigorous ground shaking which are three dimensional in nature. Past-earthquake records have revealed that electrical equipment are vulnerable to seismic event, this lead to an increased focus on the earthquake performance evaluation of electrical equipment. Dynamic loading due to earthquake should be considered at the design stage in addition to other performance parameters. Designing switchgear for earthquake loading and validating design by testing can ensure uninterrupted and safe power supply during crucial time of post-earthquake rescue operations. In case of metal enclosed switchgear, functioning of equipment during and after seismic event is the major concern. Malfunctioning due to breaking or loosening or deformation of components, loss of output due to open circuit or short circuit and spurious operation of protective relays are observed during past seismic events. Central Power Research Institute (CPRI) is equipped with stateof- the-art tri-axial shake table facility for simulating true earthquake vibration. Seismic performance evaluation of high voltage switchgear by shake table method is presented in this paper.

Keywords

Damping, H V Switchgear and Controlgear, Natural Frequency, Seismic Qualification.

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