Insulation Pressboard Oil Grid Spacing for Oil Transformer/ Oil Duct for Transformer Winding

• Application: Insulators, Electrical Winding Insulation, Winding Wire Coating Insulation, Electrical Base, Shell, Insulating Varnish, Switch Baseplate
• Type: Insulation Paper
• Chemistry: Inorganic Insulation
• Material: Paper
• Thermal Rating: A 105
• Maximum Voltage: >100KV
• Model NO.: KLY-ODB
• Classification: Inorganic Insulation Material
• Certification: ISO9001
• Color: Brown
• Transport Package: Pallet
• Specification: Customizable
• Trademark: Kang Liyuan
• Origin: China
• HS Code: 8547909000
• Production Capacity: 6000m/Day

Product Description

Introduction
 Insulation class: A (105 °C)
 100% sulphate wood pulp
 Natural-color
 Precompressed pressboard, even fiber orientation, hard and dimensionally stable
 High purity and mechanical strength
 Low shrinkage, fiber-free surface
 Good compatibility with liquid dielectrics
 
Product Description
Description and feature:
Duct strip is made from high quality pressboard G4 grade. It has excellent transformer oil impregnation feature, high compressive strength more than corrugated pressboard which is the old technology. It is used at high temperature condition and it could be improved the circuit strength.The character are below:
1. High mechanic strength
2. High electric strength
3. Accurate dimension




 
Application:  
Oil duct strip provides duct for the flow of the cooling oil in layer and strip windings in distribution power transformers. It is manufactured by bonding transformer board sticks onto insulating paper or single-coated diamond dotted paper.
Main strips: Rectangular strips, T-strips, Pigeon cauda strips, Abnormity strips.

It is used in Oil-immersed Transformers for insulation between coils. The advantage with partially coated insulation press paper lies in the internal strengthening of the coil from adhesion to the conductor; this provides passage for quick evacuation of air and moisture during the drying process. It also minimizes the risk of partial discharge,quick impregnation and flow of oil through the channels. The bonding strength of the epoxy resin is sufficient to prevent displacement of winding layers due to short circuit forces.

TRANSFORMER OIL DUCT STRIP DATA SHEET
PART1: PRESSBOARD STICK4*5*1000MM

ITEM	TYPICAL VALUES	MATTER OF FACT
Thickness: mm	4mm±7.5%	4.1-4.3mm≤7.5%
Width	5±0.5mm	4.95-5.38mm≤0.4mm
Length of 1000mm:	±5mm	1000±3 mm
Pitch of stick centre:	±3mm	23±2 mm
Apparent density: g/cm3	1.1-1.2	1.18
Moisture content ,%	4.0 to 9.0%	5.7
PH water extract:	6.0 to 9.0	6.8
Ash content,%    maximum	1%	0.51
Tensile strength  Mpa Machine direction: Cross machine direction:	≥90 ≥50	107.4 101.3
Oil absorption	≥7.0%	12.29
Shrinkage rate% MD               CMD          Thickness D	≤1.0 ≤1.4 ≤6.0	0.16 0.25 ≤5
Elongation rate  MD               CMD	≥3 ≥4	≥4.4 ≥4.4
Conductivity of aqueous extract Ms/m	≤10.0	5.03
Dielectric breakdown:(Kv/mm )In Air In Oil	10 24	16.7 35.7

 
PART2: SINGLE SIDE DIAMOND DOTTED PAPER DATA SHEET

ITEM	TYPICAL VALUES	MATTER OF FACT
Caliper:  (millimeter)	0.25mm
Thickness: mm	0.25±0.025mm+0.06		0.260 (0.260,0.258,0.262)
Width: mm	1000±5mm		1000-1005
Apparent density: g/cm^3	0.9 to 1.1		1.01
Moisture content ,%	4.0 to 8.0%		5.6
PH water extract:	6.0 to 8.0		7.5
Ash content,%    maximum	1%		0. 43
Coating thickness per side mm	0.006 to 0.012		0.011
Tensile strength,N/mm^2  Machine direction:  Cross machine direction:	80 35		86.6 48.1
Dielectric breakdown:  (volts/layer ,dry test)	≥2100		2230
Bond strength: Kpa	450kpa		679