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  Classification as per Temperature

Classification as per to temperature:

The insulating materials are categorized chiefly relies on the thermal limit. The performance of the insulation relies on the operating temperature of it.

As much higher the temperature, as much the higher will be the rate of its chemical degrading, and therefore the lower will be its helpful life as displayed in diagram. If a plausibly long life of insulation is supposed, the operating temperature of it must be maintained low. So, it is essential to ascertain the limits of temperature for the insulation that will make sure safe operation over the expected life of it.

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So the insulating materials are grouped into dissimilar classes Y, A, B, and C along with temperature limits of 900 C, 1050C and 1300C for the top first three classes and no particular limit fixed for class C. Class Y and A cover the several organic materials with no and with impregnation correspondingly, when classes B and C cover inorganic materials, correspondingly with and without a binder. With the presence of newer insulating materials, that is, the plastics and silicones, in the middle of this century, requirement was felt to reorganize the categorization of the insulating materials. This categorization is displayed in diagram below. This led IEC (International Electro technical Commission) to come up with the latest categories:

1. Class Y: 900 C: Paper, cotton, polyvinyl chloride, silk, natural rubber, etc. without impregnation. (Formerly O)

2. Class A: 1050C: similar as class Y but impregnated, plus nylon.

3. Class E: 1200C: Polyethylene terephthalate (melinex film, terylene fibre), cellulose triacetate, polyvinyl acetate enamel.

4. Class B: 1300C: Mica, fibreglass (alkali free alumino borosilicate), asbestos, bakelite, bituminized polyester enamel.

5. Class F: 1550 C: like class B but with alkyd and polyurethane, epoxy based resins.

6. Class H: 1800C: like class B with silicone resin binder, silicone rubber, aromatic polyamide (nomex paper and fiber), polyamide film (enamel, varnish and film) and estermide enamel.

7. Class C: Above 1800C: like class B but with suitable non-organic binders; (Teflon, Mica, Micanite, Glass, Ceramics, Polytetrafluoroethylene).

In the above categorization Non-impregnated, moisture absorbing materials of the Y- class are not usually employed for motor winding insulation purposes. Because they absorb easily moisture, their quality quickly degrades. C-class materials are usually brittle, thus they too are not suitable for motors. Insulation materials of A and B class are being employed for a long time for winding insulation aims. In current times F and H class are being progressively more employed for winding insulation.

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