These Pin Insulators are made by the wet process using high grade raw materials. The basic raw materials that go into the manufacture of these insulators of these insulators are naturally occuring clays and minerals like quartz and feldspar. The coarsely-powdered materials are ground to the required particle size in ball mills. The moisture content is reduced in filter process to obtain solid cakes. The cakes are fed into the pug mills. The void free pugs that are extruded from the pug mills are then pressed into shape and glazed after drying. These insulators which are thoroughly inspected before glazing are fired in the tunnel kilns.
The body composition developed over the years ensures excellent mechanical and electrical characteristics. These insulators are provided with Zinc thimbles suitable for Small and Large Steel Head Pins. Above Pin Insulators are subjected to a full series of type tests such as Impulse and Power Frequency Tests, Temperature Cycle Test, Mechanical (cantilever) test, Puncture Test & Porosity Test. Full quality control is exercised at all stages of manufacture. Some of the tests conducted on all insulators during manufacture are crack detection before firing, high frequency high voltage test besides routine electrical test at power frequency, in addition, porosity and temperature cycle tests are conducted for each batch of manufacture.
These pin insulators conforms to specifications, BS:137, IEC:383, IS:731 and other international specifications.
|Highest System Voltage||kV||12||12||12||12|
|Total Creepage Distance (Nominal)||mm||270||320||230||320|
|Protected Creepage Distance (Nominal)||mm||120||140||110||140|
|Flashover Voltage||Power Frequency||Dry||kV||70||75||65||75|
|Withstand Voltage||Power Frequency||Dry||kV||65||70||60||70|
|Power Frequency Puncture Voltage||kV||105||110||105||110|
|Visible Discharge Voltage||kV||9||9||9||9|
|Thimble Type : IS:2486 (Part-II)/ BS:3288 (Part-II)||Small or Large||Small or Large||Small||Small or Large|
|Nett Weight (Approx.)||kg||1.8||2.3||1.5||2.5|
|Contents of each package||Nos||8||6||10||8|
Applicable Specifications IS:731 BS:137 & IEC:383
Note : Insulators can also be supplied with Radio Free Glaze.
Export packing of insulators in pallets