A8DB2869d01 - IEEE Transactions on Dielectrics and...

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IEEE Transactions on Dielectrics and Electrical Insulation Vol. 13, No. 6; December 2006 1070-9878/06/$20.00 © 2006 IEEE 1217 Design Optimization of High Voltage Bushing Using Electric Field Computations S. Monga, R. S. Gorur Electrical Engineering Department Arizona State University Tempe, AZ 85287, USA P. Hansen and W. Massey SPAWAR Systems Center San Diego, CA, USA ABSTRACT This paper illustrates the use of electric field computation to optimize the design of gas filled high voltage composite bushings. The United States Navy employs these bushings in high power very low frequency/low frequency transmitting stations. Commercially available 2D and 3D computational packages based on the boundary element method were employed to analyze the electric fields. The optimized design uses both internal and external elements for electric stress grading at critical parts of the bushing. It has been shown that the location and magnitude of the maximum electric field have been optimized which should result in a substantially higher corona free operating voltage. Index Terms High voltage, bushing, boundary element method, corona ring, electric field grading, voltage contour, corona inception voltage 1 INTRODUCTION THE United States (US) Navy operates a number of very low frequency/low frequency (VLF/LF) transmitting stations that support communications to deployed submarines. Porcelain housed, SF 6 filled bushings have been used in these transmitters [1]. Typically the frequency of operation is 30 kHz. The bushing dimensions are quite different from the bushings used by the utility industry; hence these non-standard components are expensive and incur long lead times for ordering spares. There is additional incentive to look for alternate designs due to potential for an explosive failure of the porcelain bushings and subsequent shrapnel hazard to neighboring equipment and personnel. Given the success of composite hollow insulators for apparatus insulation in utility applications, the Navy is exploring the use of composite materials for their bushings. The performance of composite materials is known to be degraded with sustained corona and discharge activity [2]. One way of reducing corona is to limit the operating voltage to a value below the corona inception voltage [3]. The antennas operate at voltages in excess of 100 kV rms up to 250 kV rms and it is critical to determine the highest operating voltage for these bushings to provide safe and reliable operation. These bushings are used outdoors; hence, moisture and contamination play an important role in the performance of the bushing. Manuscript received on 21 September 2005, in final form 10 March 2006. With latest advances in computer technology and availability of modern computation packages, high electric field regions in a high voltage (HV) bushing design can be identified. Various geometric modifications can be made to the design to reduce electric field in high stress areas [4]. Software packages based
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This note was uploaded on 06/08/2011 for the course ELECTRICAL 124 taught by Professor Ghjk during the Spring '11 term at Institute of Technology.

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A8DB2869d01 - IEEE Transactions on Dielectrics and...

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