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Electrical OEM Materials for Transformers

3M™ Electrical Insulating Tape and Flexible Electrical Insulation can help improve dry-type transformer performance and can even help reduce the total cost. Our wide array of solutions include minor and major insulation materials for ground, layer, interwinding and conductor wrap applications with many UL electrical insulation systems available for adoption.

Transformer Types

  • Bobbin-wound

  • HID and Microwave

  • Wire-wound

  • Foil-wound


Higher Thermal Conductivity

  • Higher Thermal Conductivity

    Transformers can operate at a cooler temperature when designed with 3M Flexible Insulation, thanks to its excellent thermal conductivity performance.

    In testing conducted by a third party for 3M, coils fabricated with a combination of 3M ThermaVolt Insulating Paper and 3M ThermaVolt AR Insulating Paper had a maximum temperature rise that was 11% less than the same coil insulated with calendered meta-aramid. Cooler-running coils insulated with 3M products can exhibit greater overload capability and longer life.

Hot Spot Temperature Rise - 75kVA Coil

Hot Spot Temperature Rise - 75kVA Coil Chart

Long-Term Voltage Endurance

  • When faced with partial discharge or corona that may lead to premature failure, 3M insulation can provide long-term voltage endurance, helping provide greater reliability. In testing also conducted by a third party, 3M ThermaVolt Electrical Insulating Paper and calendered meta-aramid insulation were tested through a procedure developed for variable-frequency drives. With test conditions of 150°C, 180 volts/mil and 20 kHz, the average time to failure for 7-mil calendered meta-aramid was less than an hour while 7-mil 3M ThermaVolt paper completed more than two months without failure when the testing was stopped.

    Contact 3M for options for an improved efficient transformer.

High Thermal Conductivity and Benefits
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