Quality Assurance – Kokila Transformers | India’s Biggest Power Transformers Manufacturer & Distributor

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RAW MATERIAL

Component & Operation	Characteristics to check	Type Of Check	Qty to Check	Ref. Norms
Steel for tank	» Physical Properties » Dimension » Surface Condition	» T.C Verification » Measurement » Visual	» 100% » 100% » 100%	» I.S:226 & Purchase Order » –do– » –do–
CRGO	» Surface condi. » Dimensions » Cutting / edge Burrs » Losses » Insulation/Resis ance	» Visual » Measurement » Visual » TC/Measure ment » TC/Measure ment	» Sample » Sample » Sample » Sample » Sample	» I.S:3024 Kokila Drg. » –do– » –do– » –do– » –do–
Paper Insulated Copper / Aluminium Conductor	» Surface fin » Dimension » Corner » Electrical conductivity	» Visul » Measurement T.C » Measurement T.C » Measurement T.C	» Sample » –do– » –do– » –do–	» I.S:7404 & Purchase Order » –do– » –do– » –do–
Insulating material Press board	» Surface condition » Dimension » Physical / chemical / Electrical properties	» Visul » Measurement T.C » Measurement T.C	» 100% » 100% » 100%	» I.S:1576 – 1992 » –do– » –do–
Transformer	» Apperance » BDV Test » Ten delta	» Visul » Measurement » –do–	» Sample » –do– » –do–	» I.S:12467 – 1998 & 1986 » –do– » –do–

BOUGHT OUT ITEM

Component & Operation	Characteristics to check	Type Of Check	Qty to Check	Ref. Norms
Temperature indicator OTI,WTI	» Finish » Calibration » Electrical Test	» Visual » Measurement & T.C » T.C	» 100% » Sample » 100%	» PO make & Supplier drg. » –do– » –do–
Tap Switch	» Dimension » Mechanical Strength	» Measurement » Physical	» 100% » 100%	» –do– » –do–
Procelian insulators	» Finish dimension » Electrical Mech Test » Porosity Test	» Visul » T.C » T.C	» 100% » 100% » 100%	» I.S:2099 & 3347 » –do– » –do–
Gasket	» Dimension & Surface » Hardnes » Oil Absorption	» Measurement & Visual » T.C » T.C	» 100% » Sample » –do–	» I.S:4253 & 1980 » –do– » –do–
Radiators	» Pressure Test	» Leakage test	» 100%	» –do–

CORE ASSEMBLY

Component & Operation	Characteristics to check	Type Of Check	Qty to Check	Ref. Norms
Core Assembly	» Dimension » Clamping » Core Loss/Meg Charcteristics Upto 112% Voltage » Core Insulation	» Measurement » Mechanical » Electrical » Electrical	» 100% » 100% » On each unit » 100%	» –do– » –do– » –do–

COIL WINDING

Component & Operation	Characteristics to check	Type Of Check	Qty to Check	Ref. Norms
Coil winding	» Dimension » No. of Turns » Cross Over Check » Transposition » Tun to turn Insulation	» Measurement » –do– » –do– » Visual » Electrical	» 100% » –do– » –do– » –do– » 100%	» –do– » –do– » –do– » –do– » –do–
Coil Drying	Shrinkage to design dimension	» Measurement	» 100%	» –do–

ASSEMBLY & CONNECTION

Component & Operation	Characteristics to check	Type Of Check	Qty to Check	Ref. Norms
Core & Coil assembly	» Physical check » Dimension » Cross Over Check » Dryness-IR value » Turn Ratio	» Visual » Measurement » –do– » Electrical » –do–	» 100% » –do– » –do– » –do– » –do–	» Kokila Drg. » –do– » –do– » –do– » –do–

INSULATING OIL

Component & Operation	Characteristics to check	Type Of Check	Qty to Check	Ref. Norms
Insulating oil	» BDV » Density » Resisitivity @ 90°C » Oxidation stability » Moistuer content	» HV testing » Test » –do– » –do– » –do–	» IS : 6792-1992 » IS : 1448-1992 » –do– » IS : 12422 » IS : 2362	» IS : 12463-1988 » –do– » –do– » –do– » –do–

TESTING

Component & Operation	Characteristics to check	Type Of Check	Qty to Check	Ref. Norms
Testing	» Routine test » Type test » Special test » Layout Orientation » Dimension	» Electrical » –do– » –do– » Visual » Measurement	» 100% » 1 per dsg » As agreed with customer » 100% » 100%	» As per IS:2026 Spec. » –do– » –do– » As per Drg. » –do–

DESPATCH

Component & Operation	Characteristics to check	Type Of Check	Qty to Check	Ref. Norms
Despatch	» General appearance finish » Complete fitting of all accessories as per check list	» Visual » Visual	» 100% » 100%	» Insp. Record » Kokila Drg.