technical specification for ehv grade transformer oil - WBSEDCL

12.0 DECLARATION :The enclosed declaration sheet (Annexure – III) shall have to be filled up and signed.13.0 PRICE VARIATION FORMULA :For calculation of Price variation , the tenderer should furnish documents indicatingnecessary dates viz. Price of TOBS/ TOPS, Price of oil barrels, base date effective forthe quoted prices etc.14.0 DOCUMENTS TO BE SUBMITTED AT THE TIME OF PHYSICAL DELIVERY ATCONSIGNEE STORES :The following documents to be submitted by the venders to the consignee Stores at thetime of despatch to stores by the venders:-a) Copy of purchase Order.b) Copy of Despatch Instructionc) Inspection Test Certificated) Guarantee Certificatee) Proforma Invoicef) Calculation Sheet for price Variation on the basis of IEEMA or CACMAI asapplicable with base date of order.g) Seal list and packing listh) Challan in triplicatei) Way bill, if applicable.REQUIRED SPECIFICATION OF NEW INSULATING OILSL.VALUES PROPOSED AS PERNO. CHARACTERISTICS TENDER SPECIFICATION1) Appearance Clear and transparentfree from suspendedmatter or sediments.2) Density at 29.5 o C (Max) gm/cc 0.893) Viscosity, Kinematic at 27 o C (Max) 274) Interfacial Tension at 27 o C (Min)Newton / M 0.045) Flash point, Pensky Marten(closed) in o C (min). 1406) Pour point in o C (Max) - 067) Neutralisation valuea) Total acidity, mg KOH/gm (Max) 0.034 of 7

) Inorganic acidity / alkalinity Nil8) Corrosive sulphur (Copper strip)19 hours at 140 o C Non corrosive.9) Electric strength (Breakdown Voltage ) KV (rms).a) New unfiltered oil (min). 60b) After filteration (min). 6010) Dielectric dissipation factor(Tan Delta) at 90 o C (Max). 0.00211) Specific resistance (resistivity)a) at 90 o C , ohm-cms (Min ) 35 x 10 12b) at 27 o C , ohm-cms (Min) 1500 x 10 1212) Oxidation stability.a) Neutralisation value, afterOxidation for 164 hours at 100 o Cmg KOH/gm (Max). 0.40b) Total sludge, after 164 hoursAt 100 o C wt. % (max). 0.1013) Ageing characteristics after acceleratedAgeing (open beaker method withcopper Catalyst) for 96 hours at 115 o Ca) Specific resistance (resistivity)i) at 27 o C , ohm-cms (Min) 2.5 x 10 12ii) at 90 o C , ohm-cms (Min) 0.2 x 10 12b) Dielectric dissipation factor(Tan Delta ) at 90 o C (Max) 0.2c) Total acidity, mg KOH/gm (max) 0.05d) Total sludge value, Wt. % (max) 0.0514) Presence of oxidation inhibitor The oil shall not containanti oxidant additives.15) Water content, ppm (max) 2016) SK value, % (max) -The values are tentative and there is scope for further improvement in the stabilitycharacteristics of the oil, which may increase the service life of the oil.Tenderer shall furnish their guaranteed values along with method of tests for the abovecharacteristics of Transformer oil, along with their offer.5 of 7

The tenderer shall also furnish :a) Proportion of classes of hydrocarbons in the crude oil including content of aromatichydrocarbons.b) Details of barrel (Size, gauge inside/outside coating/weight of empty drum not lessthan 18 Kg.).c) List of equipments for testing of oil as per revised ISS.d) Electric strength(breakdown voltage ) KV (Min)i) Value of the fresh sample in the supplied sealed drums KV(Min).ii) Value after filling in transformer upto & within 3 months (Min).17) Reference IS Specification:IS-335-1993, IS-1448 –1967, IS-1448 –1976, IS-1448-1977,IS-6103 -1971, IS-6104-1971,IS—6262-1971, IS-6792-1992,IS-12177—1987,IS-13557 – 1992, IS-13631-1992.GUARANTEED TECHNICAL PARTICULARSSL. NO. CHARACTERISTICS GUARANTEED VALUES OF TENDERER(TO BE STATED BY TENDERER)1 Appearance2 Density at 29.5 o C (Max) gm/cc3 Viscosity, Kinematic at 27 o C (Max)4 Interfacial Tension at 27 o C (Min)Newton / M5 Flash point, Pensky Marten(closed) in o C (min).6 Pour point in o C (Max)7 Neutralisation valuea) Total acidity, mg KOH/gm (Max)b) Inorganic acidity / alkalinity8 Corrosive sulphur (Copper strip)19 hours at 140 o C6 of 7

SL. NO. CHARACTERISTICS GUARANTEED VALUES OF TENDERER(TO BE STATED BY TENDERER)iii) List of equipments for testing of oilas per revised ISSiv)Electric strength(breakdown voltage) KV (Min)a) Value of the fresh sample in thesupplied sealed drums KV(Min).b) value after filling in transformer upto& within 3 months (Min)8 of 7