Electrical Research And Development Association
Address : ERDA Road, Makarpura Industrial Estate, Vadodara - 390010, (India)
Ph. : 642942, 642964, 642377, 642557,
Fax : 643182
Email : joshicg@rediffmail.com
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Insulation Crepe Paper is one of the most important
solid insulation of the transformers oil-paper insulation system. |
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| Sr.No. | Particulars Of Test & Cl. No | Requirements as per Specification | Obtained Value | Remarks |
| 1 | Thickness, Micron (Cl.No.2) | --- | Central : 626 Maximum : 640 Minimum : 580 | --- |
| 2 | Hill Count, Counts per 10 mm | --- | 17 | --- |
| 3 | Grammage , g/m2 | --- | Central : 156 Maximum : 165 Minimum : 153 | |
| 4 | Apparent density , g/cm3 | --- | Central : 0.26 Maximum : 0.27 Minimum : 0.25 | |
| 5 | Tensile Strength expressed as Extended tensile index and elongation at break (Cl.No.5) I) Extended Tensile index, Nm/g - Machine Direction: II) Elongation at break, % - Machine Direction: | Min. 39 -- | Central : 42 Maximum : 45 Minimum : 40 Central : 197 Maximum : 202 Minimum : 193 | Conforms |
| 6 | Moisture Content, % (CI No.10) | Max. 8 | Central : 5.8 Maximum : 5.8 Minimum : 5.4 | Conforms |
| 7 | Ash Content, % (Cl.No.11) | Max. 1 | Central : 0.80 Maximum : 0.81 Minimum : 0.80 | Conforms |
| 8 | Conductivity of aqueous Extract, mS/m (Cl.No.12) | Max. 10.0 | Central : 8.0 Maximum : 8.5 Minimum : 7.8 | Conforms |
| 9 | pH of aqueous extract (Cl.No.13) | 8-Jun | Maximum : 6.3 Minimum : 6.0 Maximum : 6.3 | Conforms |
| 10 |
Oil absorption by Klemm method
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--- --- | 6 59 | --- --- |
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No. |
Cl. No. | Tests | Specified limit | Obtained value | Remarks |
| 1 | 2 | Thickness, mm | - | Central : 0.078 Maximum: 0.063 Minimum: 0.075 | |
| 2 | 3 | Substance G/m² | - | Central: 65.6 Maximum: 67.7 Minimum :65.5 | |
| 3 | 4 | Apparent density , g/cm3 | Central: 0.82 Maximum: 0.83 Minimum :0.41 | ||
| 4 | 5 | Tensile Strength expressed as
tensile index and elongation
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- - | Central: 80 Maximum: 96 Minimum :87 Central: 48 Maximum:52 Minimum :40 | |
II. II) Elongation at break,
%
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Central:2.2 Maximum: 2.6 Minimum: 1.7 Central: 5.1 Maximum: 5.6 Minimum: 4.6 | ||||
| 5 | 6 | Internal tearing strength expressed as too) factor, machine a. Machine Direction | - | Central: 12.0 Maximum: 13.2 Minimum: 11.4 | |
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- | Central: 14.9 Maximum : 17.9 Minimum: 13.1 | |||
| 6 | 10 | Moisture content, % | - | Central: 3.5 Maximum:3.9 Minimum :3.2 | |
| 7 | 11 | Ash content, % | - | Central: 0.43 Maximum: 0.47 Minimum : 0.40 | |
| 8 | 12 | Conductivity of aqueous extract, mS/m | - | Central: 6.2 Maximum: 6.5 Minimum:5.7 | |
| 9 | 13 | pH of aqueous extract | - | Central: 6.5 Maximum: 6.7 Minimum: 6.2 | |
| 10 | 18 | Air permeability, µm/pa.s | - | Central: 0.61 Maximum: 0.62 Minimum: 0.55 | |
| 11 | 19 | Water foil absorption by Klemm method
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- | 18.4 16.2 10.1 8.5 | |
| 12 | 21 | Electric Strength (ac) in oil at 90°C Kw/ | - | Central : 21.3 Minimum: 20.0 | |
| 13 | 24 | Heat Stability Test (ageing Period 120°C/168hrs)Decrease in burning strength% | - | Central : 7.7 Maximum: 13.3 Minimum:7.1 |
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