Brief IntroductionOIL DUCT STRIP TRANSFORMER OIL DUCT :
We have one pressboard stick (oil duct stick) equipment and 4 sets full-automatic edge fixing lines. Our daily putout is 10000 pcs duct stick to supply. We could provide 500 m oil duct strip one day. 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 paer. Duct strip has the excellent transformer oil impregnation feature, it has high compressive strength more than corrugated pressboard which is the old technology, it's used at high temperature condition and it could be improved the circuit strength.
TRANSFORMER OIL DUCT We have 2SETS pressboard stick (oil duct stick) equipment and 4 sets full-automatic edge fixing lines. Our daily putout is 10000 pcs duct stick to supply. We could provide 500 m oil duct strip one day.
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 DescriptionDescription 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.
TRANSFORMER OIL DUCT STRIP DATA SHEETPART1: 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 |
| 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/cm3 | 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/mm2
Machine direction:
Cross machine direction: |
80
35 |
86.6
48.1 |
Dielectric breakdown:
(volts/layer ,dry test) | ≥2100 | 2230 |
| Bond strength: Kpa | 450kpa | 679 |
|
|
|
|
1.Rectangular Strips
2. Trapezoidal Strips
3. T-Strips
