Public Works Department-PWD has published Tender For Maintenance Of Water Supply System Servicing Overhauling And Repairs Replacement Of Worn Out Parts Of On Load Tap Changers Of 33Kv 3.3Kv 1250 Kva Transformer At Gogal Clear Water Pumping Stations. Submission Date for this Tender is 18-07-2023. Railway Ancillaries Tenders in South Goa Goa. Bidders can get complete Tender details and download the document.
| Sl. No. | Item Description |
| 1 | Servicing andOverhaulingofOn Load Tap ChangerOLG makes type ABS III 200 30 9 17 0G ( Sr.No :39465) at Gogal Pumping Station by company technician/authorized experienced person as detailed below:A) Drive mechanism: Visual check for the condition & functioning ofi) Contactors, ii) Heater, thermostat & Switch, iii) Motor, iv) Motor protective relay , v) Aux. transformer, vi) Geneva Assembly, vii) Stuffing box oil seal, viii) Motor Drive belt tension, ix) Limit switch, x) Main spring, xi) Condition of sealing gaskets, xii) Lubrication/greasing of rubbing parts. B) Selector/Drive Switch: i) Quality of oil: BDV, PPMii) Erosion of fixed contacts iii) Erosion of Moving contacts, iv) Condition of terminal Board, v) Phase board, vi) Lead clearance. C) Functional checks / test on OLTC : i) Raise/ Lower Operations, ii) Step-by-Step Operation, iii) Tap position indication, iv) Tap -Change -in Progress indication, v) Limiting Devices,vi) Operation counter, vii) Manual Operation ofthe Drive Mechanism, viii) Functioning of OSR in test positin .as directed by Engineerin charge. |
| 2 | Servicing andOverhauling ofCTR make, EO16 Type OLTC, ( Sr.No. 21TC2P2632 )by company technician/authorized experienced personas detail below: a) Check proper transformer OLTC isolation,b) Visual check for DM box function and condition : i) check all electrical connections , heater , thermostat & switch , Contactor operation, motor and gear operation smooth, motor protective relay operation Auxiliary transformer output voltage , Limit switch operation , Check energy accumulator spring function, check DB box doorgasket, Checkoil seal condition, Check OLTC conservator oillevel. c) Selector switch condition checking: |
| 3 | i) Check carbon deposition in selector switch chamber and clean the selector switch chamber, check for erosion offixed and movingcontacts , check tightness ofOLTC contacts and phase board assembly, Check tightness of copper tubes, taper pins and bushing board assembly, check tightness of epoxy Arm, assembly ( Main Moving and Resitance Moving contacts ) , Cleaning of selector switch contacts , removing all carbon deposits with clean cloth, Check BDV value ,d) Operational Checking :i) Raise/ lower operational checking manual, Raise/ Lower operation electrical , checking through local control, Raise /Lower operation electrical checking through remote control counter operation, Check TPI indication progress, Check Tap function of OSR in test position , Check electrical operation through AVR , proper AVR setting to be done , e) Electrical Testing : Checking megger, Ratio test and Magnetic balance test etc. Complete as directed by Engineer-in-Charge. |
| 4 | Supplyand Replacement of worn outspare for On Load Tap ChangerOLG makes type ABS III 200 30 9 17 0G ofGogal Pumping Station. |
| 5 | i) Link Belt Good year type -A Section 12.7mm, 30 X 4.( PS57606 ) |
| 6 | ii) Main Spring Assembly 33KV ( KS3302) |
| 7 | iii) Bottom Flange Gasket 33Kv 17 pos ( 40276700000) |
| 8 | iv) Top Frame Gasket . ( 40270900000) |
| 9 | v) Fixed Contact-01 Stem ( 40313600100 ) |
| 10 | vi) Fixed Contact-01 Main ( 40313700100) |
| 11 | vii) Hinge Assy 33KV 17 pos P/S < 100A ( KABS01007 ) |
| 12 | viii) Kit for 33KV 17P P/S Resitance assembly (Ds-11) ( KA3359) |
| 13 | Supply and Replacement of defective/worn out parts of CTR make On load Tap Changer moving mechanism type EO16 , of 33KV/3.3KV , 1250KVA transformer at Gogal Pumping Station. |
| 14 | i) Top/ BottomCover Gasket |
| 15 | ii) Main Moving Contact Assy. |
| 16 | iii) Resistor Moving Contact Assy. |
| 17 | iv) Fixed Contact Assy. |
| 18 | v)Hardware |
| 19 | vi) Transition Resistance Assembly 1 Set =3Nos |
| 20 | Filtration of oil of2 Nos. OLTC ofeach 33KV/3.3KV, 1250KVAoutdoor transformersat Gogol Pumping Station bydraining of OLTC oil in clean and moisture free barrels and refilling after Servicing ofOLTC including required tools & tacklesComplete as directed by Engineer-in-Charge. |
| 21 | Supply and Topingupof transformer oil make Power oilfor 2Nos. OLTC"s of33KV/3.3KV, 1250KVA transformers at GogalPumping Station . |
| 22 | Supply and Replacement of silica jellbreatherof2kg capacity, 2nos of 33KV/3.3KV ,2000KVAtransformer conservator main tank ,0.50kg , 2nos . oftransformerHV cable box at Verna Pumping Station and 1.50kgcapacity , 2nos of 1250KVA transformer conservator main tank , 0.5kg capaciy1no of OLTCat Gogal Pumping Station. |
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