Call For Paper Volume:4 Issue:8 Aug'2017 |

Insulation Scheme Improvement of 145kV Current Transformer Using Electric Field Analysis through Finite Element Method

Publication Date : 01/04/2016



Author(s) :

Santosh R. Jain , Ramchandra Hasabe , Goplasing Patil.


Volume/Issue :
Volume 3
,
Issue 3
(04 - 2016)



Abstract :

This paper proposes a new Capacitive graded bushing configuration for 145kV Live Tank Current Transformer which has lowest possible maximum electrical stress in it. Capacitive graded bushing breakdown is one of the major reasons of Current Transformer failures (In-service and at test bead). Since this bushing is heart of the current transformers, so it is necessary to design it carefully and to have proper electric stress distribution in capacitive graded bushing. The main motive is to obtain the better design of a capacitive graded bushing which will have reduced electric stress as compared with the existing design. Capacitive graded bushing contains concentric aluminium foils which are isolated from each other by Oil Impregnated Paper (OIP). The partial capacitances (Combination of Series and Parallel) between these can be modified by adjusting the number of foils, its diameter, width and foil staggering also the thickness of dielectric material between foils. This stated grading configuration’s stress level is under the limit considering all practical conditions, taking the various literature, IEEE transactions and practical results as benchmark. This paper reveals the configuration which gives improved and optimal electric stress distribution in the designed bushing configuration and which ultimately reduces the oil volume content, cost of active part insulation and the porcelain housing as a whole product.


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Insulation Scheme Improvement of 145kV Current Transformer Using Electric Field Analysis through Finite Element Method

March 23, 2016