Strips and Spacers
According to IEC 60641-1 Type B 3.1
Rectangular strips are fitted in axial oil channels as spacers for the cylinders. Special strips are used between supporting cylinders and windings, which act as spacers between cylinder and winding (for cooling of winding) and make the radial spacers mechanically fixed.
Since the strips are exposed to strong electric fields, a tissue free surface and specific rounded edges strips are of great importance to maintain dielectric strength of the overall arrangement.
Spacers made of high density boards with high short- circuit strength are used in windings. They can be supplied in final milled states. Milled spacers and strips with rounded edges prevent damages to the wire insulation. In contrast to punched spacers, milled spacers release substantially less cellulose fiber to the oil, witch has a positive effect on the dielectric strength of the coolant.
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