Informatics Publishing Limited

Dundru Sridhar ¹, Kanyakumari M. ², Jithin Pauly P. ³, Karunakara K. ⁴, Vasudev N. ²

Affiliations
1 Junior Research Fellow, High Voltage Division, Central Power Research Institute, Bangalore - 560080, IN
2 Joint Director, High Voltage Division, Central Power Research Institute, Bangalore -560080, IN
3 Engineering Officer, High Voltage Division, Central Power Research Institute, Bangalore - 560080,, IN
4 Engineering Officer, High Voltage Division, Central Power Research Institute, Bangalore - 560080, IN

Abstract

In this paper, comparative analysis of computed and measured lateral profiles of electric field distribution at maximum sag point has been done for the existing 765 kV AC transmission line located at northern region of India. Computations were carried out by using developed MATLAB^TM Program. Measurements were carried out by using electric field meter designed in CPRI. Right of way is also determined for both computed and measured values of electric field based on safety limits given by Central Electricity Authority (CEA). Measured quantities compared with computed electric field. From the obtained results it is observed that, measured right of way is almost matching with computed right of way and there are few differences between computed and measured values. Possible reasons are explained for the causes of differences.

Keywords

Electrostatic Field, Ill Effects, mMxwell’s Coefficient Matrix, Analytical Method, Measurements, Right of Way, Safety Limits

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Dharmesh Y. ¹, Vasudev N. ¹, Karunakara K. ¹, Sheshagiri Rao U. R. ¹, Shivakumara Aradhya R. S. ¹, Anoop Kumar Gupta ², Mukesh Wadhwa ²

Affiliations
1 High Voltage Division, Central Power Research Institute, Bangalore - 560 080, IN
2 DMRCL, Metro Bhavan, 6th Floor, Fire Brigade Lane, Barakhamba Road, New Delhi - 110 001, IN

Abstract

This paper describes the failure analysis of a section insulator assembly at one of the depot of Delhi Metro Rail Corporation Limited (DMRCL). Frequent breaker tripping at Saritavihar depot of DMRCL due to flashover of the section insulator assembly was observed; the cause of failure of the section insulator was investigated and presented in this paper. As a first step laboratory tests on new and used section insulator assemblies were conducted to make comparative analysis, and then simulation studies were carried out to estimate the possible over voltages during different switching operations and their relationship with the test voltages used in the experimental investigation. This paper presents the laboratory experiments and simulation studies for the failure analysis of section insulator assembly of DMRCL.

Keywords

Section Insulator, Electric Traction, Insulation Level and Impulse Testing

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