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WINDING WIRES Winding wire is an important constituent of practically every type of electrical product. The

variety of winding wires has grown from simple oleoresinous enamel coated to coatings like

polyester, polyesterimide, polyurethane, single and dual coated and also PVC. ERDA is

actively involved in testing, evaluation and investigation of all types of winding wires as wellas raw materials. Relevant R&D activities accompany the regular testing activities. 

Test Facilities 

Raw materials that are tested include: 

1  Polyvinyl Chloride  IS:5831, IEC:60540

2  Polyester, polyesterimide,

Polyamideimide, polymide  IS:13778, IEC:60851

3  Conductors (Copper and Aluminium)  IS:8130, IEC:60228

Testing of the different kinds of winding wires include:

1  Polyvinyl acetal based enamelled wire  IS:13730, IEC: 60317

2  Polyester based enamelled wire  IS:13730, IEC:60317

3  Polyurethane & Polyvinyl formal based

enamelled wire  IS:13730, IEC:60317-2,4 4  Polyvinyl acetal or polyesterimide

based enamelled wire for refrigerant

system

IS:13730, IEC: 60317-8 

5  Polyesterimide based winding wire  IS: 13730-15, IEC: 60317-156  Polyesterimide based winding wire with

an overcoat of polyamide-mide

IS:13730, IEC:60317 7  Polyvinyl chloride based winding wire  IS:8783 8  Glass Fibre wound Varnish treated

enamelled sire  IS:13730-31,32

IEC:60317-31,32 Further, the quality of enamelled wires is tested by conducting long term ageing test as per 

IEC:60216 and IS: 5825. For enamelled wires determination of tip up temperature by

measuring tan delta at various temperatures after impregnation and accelerated ageing

tests is also done. Infrastructure 

y  High resistivity meter  y  Tan delta meter  y  Ageing ovens y  ACDC high voltage testing equipments y  Kelvin bridge 

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y  Instron tensile testing machine y  Cut through tester  y  Pin-hole tester  y  Unidirectional abrasion resistance tester  y  Thermo gravimetric analyzer  y  Abrasion resistance, springiness test setups 

Certification

The test facilities for winding wires at ERDA are recognised by BIS for its marking scheme and

also accredited by NABL, Govt. of India.

R&D Activities 

Projects Completed : y  Evaluation of indigenously manufactured copper wires and development of quick 

quality control test y  Evaluation of enamelled wire/compound compatibility y  Comparative evaluation of enamelled Aluminium wire of Aluminium Pechiney and

indigenous enamelled winding wires. y  Comparative evaluation of indigenous and imported enamelled winding wires y  To recommend a computerised quicker method for thermal class evaluation of insulating

material