Oil duct spacer curtain is a core insulation & heat dissipation component applied in layer winding of oil-immersed power transformers. It is assembled with high-density transformer pressboard / laminated wood spacers bonded with grid dot adhesive insulation paper via eco-friendly insulating glue. Spacers are arranged equidistantly to form fixed and regular oil circulation channels, an ideal upgrade to traditional corrugated oil duct board.