Hi All,
While nominated for carrying out insulation coordination study for EHV system using PSCAD, I came to a point for transmission line transient that takes me back to some undergraduate courses, the point is the reflected wave.
I understand that there is a wave which is travelling along a...
Hi all,
when designing an EHV SS, it was noticed that the SA phase-to-ground clearance is interfering with the SF6 Air Bushing insulator (not grounded structure, i understand that there shall be some voltage in between zero and the HV Phase voltage somewhere on the bushing surface as it is...
Hi all,
In a 380 kV System, After running a study for insulation coordination with PSCAD, with a lightning impulse of 1.7/77 us, the resultant voltage on bushing was showing oscillatory response with a peak of 846 kV and 2.5/103 us overall characteristic(the oscillation isn't reaching the...
It is well known that no switching study is required for systems less than 300 kV, my question is why no BSL nor switching study is required for such voltage level?
Hi all,
It has been reported to our department that a new substation has supply by in-out arrangement from an existing double circuit 380kV OHTL, experiences frequent FLASHOVER on the two suspension towers adjacent to the tapping point, the flashovers occured almost at same time daily it is...
