FAULT INTERPRETATION OF POWER APPARATUS USING HEXAGON BASED DISSOLVED GAS ANALYSIS

Abstract

In protecting a Power Apparatus (PA), the limiting of damage becomes a by product of the protection system function. To interpret the type of fault by analysing the dissolved gases, a simple algorithm incorporating all the different zone areas for fault interpretation is developed and implemented in this paper. To interpret the faults occurring in power apparatus like Power Transformers (PT), Load Tap Changers (LTC) and Bushings from the Dissolved Gas Analysis (DGA) data, the Hexagon algorithm is developed that interprets the faults when the DGA data is imported. DGA data samples collected from various substations are used to test this algorithm for fault interpretation. In this Hexagon algorithm the data of fault gases from various Power Apparatus evolved from mineral as well as non mineral, cooling and insulating media is given as input and the type of fault interpreted by the algorithm is obtained as output. All the cases of equipments and insulating media can be tested using this Hexagon algorithm. This window based Hexagon results are useful for control and protection of electricity in transmission and distribution side.