Crepe Papers and Crepe-Paper Cables [includes discussion]

Varnished cambric tape has been used as electric insulation very extensively in the past because of its high dielectric strength, stretchability to fit irregular surfaces, and relatively high resistance to humidity. However, this material is relatively expensive, and seriously contaminates the Askarels. Two new high-density crepe papers have now been developed to replace the varnished cambric. For the same thickness and width, the tear strength of one of these new crepe papers is equal to that of the varnished cambric, while its lengthwise tensile strength is almost three times as high. The dielectric strength of this crepe paper at both 60 cycles and impulse tests compares very favorably with the varnished cambric. The second of these new crepe papers is characterized with 2-way stretch and is suitable for producing cables with great flexibility. The electrical, physical, and chemical characteristics of this new paper are also comparable to those of varnished cambric. Cables insulated with this new crepe paper can be advantageously used for both oil and Askarel transformers.