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

Affiliations
1 Ph.D Student, Dept. of Civil Engineering, NITK, Mangalore - 575025, Karnatakam, IN
2 Additional Director, Earthquake Engineering & Vibration Research Centre, CPRI, Bangalore - 560080, IN
3 Professor, Dept. of Civil Engineering, NITK, Mangalore - 575025, Karnatakam, IN

Abstract

History of past earthquakes had demonstrated that structural failures in substations were nonrecoverable unless huge amount of money and man power involves in it. A broad range of substation equipment are especially vulnerable to seismic vibrations and circuit breaker is one among them. Failure in circuit breaker results flow of excessive current in substation components than the respective ratings. Excessive current in substation components cause fire accidents along with power outages. The efficient way to resolve the problem is to analyze and identify the failure points over the earthquake vibrations before installing in the field. This paper discusses in relation to earthquake acceleration amplification of 12 kV circuit breaker used in substations. Shake table experiments are conducted on circuit breaker at higher seismic zone levels. The ground motion amplification obtained from finite element analysis and shake table tests is compared.

Keywords

Circuit breaker, Ground motion amplification factor and Shake table experiments

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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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