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Telephone Paper Covered Wire
Introduction
Telephone paper covered wire is a traditional paper insulated winding wire. It uses round copper / rectangular copper or aluminum conductors, with insulation formed by multi-layer overlapping wrapping of special telephone paper (QB 218). The insulation layer is thin, compact, flexible and smooth, suitable for oil-immersed electrical windings.
Key Features
Thin and flexible insulating paper (0.03–0.08 mm), tight wrapping and low space occupation
Stable electrical insulation, applicable for power frequency / low-frequency windings
Good oil resistance, compatible with transformer oil environment
Thermal Class: 105°C (Class A) after impregnation
Excellent workability: Smooth winding with low risk of damage
Moderate cost and mature manufacturing process
Application Scenarios
Oil-immersed power transformers, distribution transformers (main windings / regulating windings)Oil-immersed reactors, instrument transformersWindings for legacy communication equipment, telephone exchanges and carrier equipmentLow/medium-frequency oil-immersed motors and traction transformers
