Power Research

R. Panneer Selvam ¹, R. Ramesh Babu ²

Affiliations
1 Joint Director, Central Power Research Institute, Bengaluru – 560080, IN
2 Director, Central Power Research Institute, Bengaluru – 560080, IN

Abstract

Earthquake results in multifrequency vibratory ground motion at the earth’s surface, having both horizontal and vertical components. Three dimensional random earthquake vibration induces stress in the electricale quipment, components, and structures causing massive damage. Dynamic loading due to earthquake should be taken into consideration while designing electrical system. This will ensure uninterrupted power supply and safety, during and after the event of earthquake. Busbar trunking systems are utilized in high rise buildings, hospitals and industrial applications to distribute power to electrical loads. Sandwich busbartrunking systems are alternative to conventional power cabling. Seismic behaviour of Busbartrunking system depends on support, support structure, anchoring etc. Seismic qualification of Sandwich Busbartrunking system is presented in this paper.

Keywords

Sandwich busbar, resonance search, time history test

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R. Panneer Selvam 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 cabinets are widely used in power control systems. Electrical cabinet is housing for many delicate protection, measuring and control equipments like relays, meters, circuit breakers, logic device, printed circuit board etc. Seismic load should be one of criteria for selection of electrical enclosures. Seismically qualified Electrical cabinet ensures proper functioning and safety of equipment installed in it during and after seismic event. Electrical enclosures should not amplify seismic waves and should withstand seismic load without undergoing any physical failure. A typical Seismic qualification test carried out on an electrical enclosure is discussed in this paper

Keywords

resonance frequency, seismic qualification, electrical cabinet.

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

Affiliations
1 Ph.D student, Dept. of Civil Engineering, NITK, Mangalore-575025, IN
2 Additional Director, Earthquake Engineering and Vibration Research Centre, CPRI, Bangalore, IN
3 Professor, Dept. of Civil Engineering, NITK, Mangalore-575025, IN

Abstract

Substation equipment, whose natural frequencies lie in the normal frequency range of earthquake ground motion, is particularly vulnerable to damage by seismic events. Electric power systems are expected to be functional during and after major earthquakes and it is vital to sustain economic activities and assist recovery, restoration, and reconstruction of the damaged structures and equipment during earthquakes. Current transformer (CT), usually having a narrow long porcelain insulator, is the most vulnerable part subjected to earthquake. This paper evaluates amplifi cation factor in terms of acceleration from the ground to top of the support structure where the current transformer is mounted. Sine sweep tests are conducted on current transformer with support structure to evaluate its dynamic characteristics using shake table tests. The ground motion amplifi cation obtained from fi nite element analysis and shake table tests is compared.

Keywords

Current transformer, Amplifi cation factor, Shake table test

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K. Chethan ¹, R. Ramesh Babu ², Katta Venkataramanna ³, Akanshu Sharma ⁴

Affiliations
1 Lecturer, Department of Civil Engineering, UVCE, Bangalore University, Bangalore, IN
2 Additional Director, Central Power Research Institute, Bangalore, IN
3 Professor and Head, Department of Civil Engineering, NITK, Surathkal, IN
4 Scientific Officer, Bhabha Atomic Research Centre, Trombay, Mumbai, IN

Abstract

Comprehensive experimental and numerical studies are carried out on the dynamic characteristics of 3 dimensional (D) reinforced Concrete (RC) frame with Masonry Infill (MI). MI though considered as non-structural element largely affect strength, stiffness and ductility of the framed structure during the application of lateral loads such as wind and earthquake loads. This paper is a part of a collaborative research project between CPRI and BARC focusing on the influence of MI on the natural frequencies of 3D RC frame and comparison of the results with the design codes. A 3D RC frame having two bays and three storeys is designed and detailed as per the relevant Indian standard codes. A simple numerical model is being formulated to obtain the natural frequencies in the FE analysis and Tri-axial shake table of 3m × 3m is used for the experimentation. The details of the numerical analysis and experiments carried out in the research work are brought out in this paper.

Keywords

RC Frame, Masonry Infill, Natural Frequency, Shake-Table Test.

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M. Selvaraj ¹, S. M. Kulkarni ², R. Ramesh Babu ¹

Affiliations
1 Mechanical Engineering Division, Central Power Research Institute, Bangalore, IN
2 National Institute of Technology Karnataka (NITK), Surathkal, Mangalore, IN

Abstract

The technology of compaction of power transmission lines is being increasingly adopted by power industry to effectively make use of the Right of Way (ROW). For technical, aesthetic and economical reasons, our future transmission lines will have to be built with new design concepts using new materials. An attempt was made to build the transmission line tower cross arm with pultruded sections of Fibre Glass Reinforced Plastic (FRP) as a substitute for steel. The metallic towers have been deteriorating and corroding as a result of being in hostile environment i.e., wind, rain and salty environment etc. This paper describes the mechanical behaviour of FRP tower cross arm assembly simulated using Finite Element Analysis (FEA) software and compared with experimental results.

Keywords

Compact Transmission, Cross Arm, Right of Way.

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