Detailed Product Description
3520 Phenolic paper laminated tube
Characteristics and applicationTemperature classification is E. Good dielectric property under dry state. Used as the insulating structural parts of electrical apparatus in transformer oil at dry environments.
StandardJB/T3172-1999
Technical requirements are shown in table 1, 2 and 3
Table 1 Nominal thickness and tolerance
Unit: mm
Inner diameter | Tolerance of inner diameter | Wall thickness | Tolerance of wall thickness | |
10 | 10-25 | |||
515time of 1 | ±0.3 | 1.0-15 | ±0.4 | ±0.5 |
1650time of 1 | ±0.4 | 1.5-15 | ±0.5 | ±0.8 |
51120time of 1 | ±0.5 | 2.0-20 | ±0.5 | ±1.0 |
122250times of 2 or 5 | ±0.7 | 2.5-20 | ±0.5 | ±1.0 |
255500times of 5 | ±0.8 | 3.0-25 | ±0.5 | ±1.0 |
505800times of 5 | ±1.0 | 5.0-30 | ±1.0 | ±1.0 |
8101000times of 10 | ±1.5 | 7.0-40 | ±1.0 | ±1.0 |
1010-1200times of 10 | ±2.0 | 8.0-50 | ±1.0 | ±1.0 |
Note: 1. Wall thickness: 1.0-3.0mm, times of 0.5mm; 3.1-15mm, times of 1mm ; 16-30mm, times of 2mm; 31-50mm, times of 5mm, 2. The tolerance of wall thickness is negotiated by supplier and customer when wall thickness is over 25mm. 3. The specification of dimension is negotiated by supplier and customer outside of above. | ||||
Table 2: Nominal length and tolerance
Length | Tolerance |
450550 | ±25 |
900-1200 | ±25 |
1400-1950 | ±25 |
Note: The minimum length is no less than 425mm when the customer does not indicate the length. | |
Table 3: The main technical requirements
No | Item | Unit | Normal value | |
Inner diameter 525mm | Inner diameterabove 25mm | |||
1 | Density | g/cm3 | ≥1.03 | ≥1.10 |
2 | Water absorption | % | ≤310 | ≤310 |
3 | Thermal stability for 24h | 120 | 120 | |
4 | Flexural strength | N/mm2 | ≥50.0 | ≥60.0 |
5 | Compressive strength | N/mm2 | ≥50.0 | ≥60.0 |
6 | Dissipation factor50Hz | - | ≤0.03 | ≤0.03 |
7 | Voltage resistance perpendicular to the layer direction at 90±2 transformer oil for 5 min. Wall thickness1.52.5mm 2.53.5mm 3.54.5mm 4.56mm 69mm | MV/m |
≥8.5 ≥8.0 ≥7.0 ≥6.5 ≥6.0 |
≥8.5 ≥8.0 ≥7.0 ≥6.5 ≥6.0 |
8 | Voltage resistance parallel to the layer direction at 90±2 transformer oil for 5 min. | kV | 20 | 25 |
9 | Surface voltage resistance after being humidified in the air at room temperature for 1 min | kV | 12 | 12 |
