Quality Assurance PRESENTED BY PROF VG PATEL TRANSFORMER

Quality Assurance PRESENTED BY PROF. VG PATEL

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Quality Management System & Planning Saturday, June 12, 2021 VG PATEL 2

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Saturday, June 12, 2021 VG PATEL 3

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Saturday, June 12, 2021 VG PATEL 4

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Saturday, June 12, 2021 VG PATEL 5

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Saturday, June 12, 2021 VG PATEL 6

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Saturday, June 12, 2021 VG PATEL 7

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Saturday, June 12, 2021 VG PATEL 8

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE TODAY WE WILL DISCUSS QUALITY ASSURANCE ONLY Saturday, June 12, 2021 VG PATEL 9

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Quality Assurance: v. In-process quality checks. v. Incoming material checks. v. Outer inspection. v. Internal inspection. v. Final inspection. Saturday, June 12, 2021 VG PATEL 10

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE In-process quality checks: v. Winding Section v. Core assembly Section v. Core coil assembly Section v. Tanking Section Saturday, June 12, 2021 VG PATEL 11

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE 1. Winding Section: Saturday, June 12, 2021 VG PATEL 12

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE 1. Winding Section: Saturday, June 12, 2021 VG PATEL 13

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE 1. Winding Section: v. No of discs. v. No of turns per discs. v. Radial depth of coil. v. Tightness of discs. v. Insulations between discs as per drawing. v. Inner diameter of coil. Saturday, June 12, 2021 VG PATEL 14

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE v. Outer diameter of coil. v. Height of coil. v. Position of oil guiding washers as per drawing. v. Lead continuity checking. v. Arrangement of drop of turns as per drawing. Saturday, June 12, 2021 VG PATEL 15

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE v. Top & bottom insulation after pressing of coil. Saturday, June 12, 2021 VG PATEL 16

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE 2. Core assembly Section: Saturday, June 12, 2021 VG PATEL 17

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE 2. Core assembly Section: v. Leg Centre of core. v. Leg Length of core. v. Diagonals of Core. v. Diameter of limbs & yoke. v. Steps arrangement of core. v. Window dimensions of core. Saturday, June 12, 2021 VG PATEL 18

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE v. Condition of Channels. v 2 KV test of core clamps & core bolts. v. Arrangement of base block. Saturday, June 12, 2021 VG PATEL 19

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Saturday, June 12, 2021 CORE-COIL ASSEMBLY VG PATEL 20

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE 3. Core coil assembly Section: v. Inner insulation after fitting of coil on limb. v. Arrangement of upper yoke. v. Horizontal base level. v. Tightness of winding assembly. Saturday, June 12, 2021 VG PATEL 21

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE v. Arrangement of insulation at top and bottom. v. Checking for sharp corners after brazing. v. Dimension of conductor. v. Dimension of bus conductor. v. Connections on LV side. v. Connections on HV side. v. Insulation between LV & HV. v. Insulation between two phases. v. Ratio and M. B. test Saturday, June 12, 2021 VG PATEL 22

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE 4. Tanking Section: Saturday, June 12, 2021 VG PATEL 23

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE 4. Tanking Section: v. Proper gasket cutting. v. Fittings of valves. v. Tighten of nut-bolts. v. Earth wire connections. v. O. L. T. C connections. v. Terminal marking of C. T on epoxy terminals. v. Clearance between live & earth parts. Saturday, June 12, 2021 VG PATEL 24

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE In coming material checks: v. Lot wise inspection. v. Suppose the quantity of MOG is 15 Nos. Then we have to check 2 or 3 nos. of them. v. After checking if it is OK then we accept the lot of MOGs. v. If it is not OK then we reject the whole lot. Saturday, June 12, 2021 VG PATEL 25

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Outer inspection: v The material which we give order for our requirement like PICC, CRGO, Tank, Channel etc. v We should check quality at suppliers’ works/premises. v Stage inspection is also a part of this activity. Saturday, June 12, 2021 VG PATEL 26

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Internal inspection: v. After tanking this type of inspection is done. v. The accessories, Proper fittings these things are checked by QA department. Saturday, June 12, 2021 VG PATEL 27

TRANSFORMER ENCYCLOPAEDIA QUALITY ASSURANCE Final inspection: v Verification of complete transformer and fittings as per approved drawings. v Clearance and oil leakage test is done in final inspection. v This inspection is done in presence of customer. v Final testing of transformer as per relevent standards. Saturday, June 12, 2021 VG PATEL 28

TRANSFORMER ENCYCLOPAEDIA OPEN FORUM Saturday, June 12, 2021 29

TRANSFORMER ENCYCLOPAEDIA THANQ Saturday, June 12, 2021 30