Informatics Publishing Limited

R. Panneer Selvam ¹, A. N. N. Nampoothiri ¹, R. Ramesh Babu ²

Affiliations
1 Engineering Officer, Central Power Research Institute, Bangalore - 560 080, IN
2 Additional Director, Central Power Research Institute, Bangalore - 560 080, IN

Abstract

Electrical and telecommunication facilities are observed from the past earthquake data, as seismically weak and prone to service failure due to suddenly applied seismic loads. Among them substation equipment are the most vulnerable ones. A need for reliability of electrical equipment against vibrational hazards due to earthquakes has become prime importance. In order to meet the basic requirements regarding seismic qualification of equipment and thereby to ensure reliable power transmission, Earthquake engineering laboratory capable of performing a diverse range of seismic qualification requirements on equipment, sub-assemblies and components as per National and International standards has been established at CPRI, Bangalore. Seismic qualification of few equipment carried out are presented.

Keywords

Seismic qualification, natural frequency, 36 kV circuit breaker, substation equipments

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R. Panneer Selvam ¹, A. N. N. Nampoothiri ¹, Yamini Gupta ¹, D. Nagesh Babu ¹

Affiliations
1 Central Power Research Institute, Bangalore – 560 080, Karnataka, IN

Abstract

Relays are the protection and switching devices in most of the control processes or equipment. Relays respond to one or more electrical quantities like voltage or current such that they open or close the contacts or circuits. Relays are subjected to vibration and mechanical shock due to operating environment, transportation, mishandling and earthquake. Operating environmental vibration and shock may result in spurious operation of relays. Understanding cause and effect of vibration on relay performance is paramount to ensure reliable functioning of relays. Relays should be designed for the anticipated operating environmental vibration and shock levels. Vibration and shock qualification is performed to determine if a product can withstand the rigors of its intended use environment, to insure the final design will not fall apart during shipping, for environmental stress screening and to weed out production defects. CPRI is equipped with state-of-the-art facilities to qualify equipment and components for vibration and shock conditions. Performance of relay under vibration environment is discussed in this paper.

Keywords

Resonance Frequency, Shock, Vibration.

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