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Master's Thesis from the year 2013 in the subject Electrotechnology, grade: 1, Nirma University (Institute of technology), course: M.Tech, language: English, abstract: An internal arc test is not a mandatory test. It is a consumer premises test. It should be done on the terminal box, panel, enclosure, etc. Overpressure at internal arc, inside the penal, may be a danger for the worker working inside the field. compact substation in the public area must have to be arc proof. In this thesis report, in the beginning, the internal arc phenomena are discussed. Thereafter the internal arc test condition and their standards are given. In the middle part of the thesis, the analytical method is given and its failure is discussed and the limitation is of the old method is clearly shown with taking practical data at calculation data. The internal arc test is very expansive in the real working field and may danger sometimes because of loss of equipment during the test. although it is consumer selection to decide the level and location of the short circuit. It is always a risky test. In this thesis, the computer simulation method using Finite Volume Method (FVM) for simulation of the internal arc test with following all testing standards with selecting particular assembly is modeled. The electromagnetic and fluid combined analysis is presented to a detailed plasma arc. The MHD equation is derived and solved at the end using ANSYS software.