Theory of electrical HV impulse affect on steel lamination insulation
Theory of electrical HV impulse affect on steel lamination insulation
(OP)
Could someone provide information with regard to the theory of how HV elecrical impulses travel in transformer motor and generator core steel laminations, from the windings through the insulation coating?
I am presently involved with form wound winding interturn tests and have noticed that a 0 - pk wave of >0.5micro s but less than 1.2 micro s rise time has some influence on the level of insulation seen on the core lamination insulation material after this test.
Any ideas?
Thanks
I am presently involved with form wound winding interturn tests and have noticed that a 0 - pk wave of >0.5micro s but less than 1.2 micro s rise time has some influence on the level of insulation seen on the core lamination insulation material after this test.
Any ideas?
Thanks






RE: Theory of electrical HV impulse affect on steel lamination insulation
RE: Theory of electrical HV impulse affect on steel lamination insulation
the test work I am involved in is inter-turn insulation testing of inserted coils in the core, but ones which are not yet connected in groups of phases.
Your comment may mean that this is a new area for consideration in a very specialised field.
Thanks anyway
RE: Theory of electrical HV impulse affect on steel lamination insulation
RE: Theory of electrical HV impulse affect on steel lamination insulation
Thanks for your posting.
Could you please provide detail on exactly how the core loss is expected to be reversible?
my investigations thus far have shown burr and pressure induced shorting of the laminations but I donnot understand how this could be reversed as I understood once the short is there, a permanent path is established due short circuiting the lamination during the high stress levels induced by the 0 - Pk impulse test and will be maintained ever after.
Thanks for the ANSI standard, I will look into it
RE: Theory of electrical HV impulse affect on steel lamination insulation
Now some history:During the olden days the change in losses was appreciable due to poor insulation provided on the core laminations .But with todays modern core lamination insulations (C-5 over C-2)the increase in losses is negiligble often less than 0.5%.