Public Works Department-PWD has published Maintenance Of Water Supply System Servicing And Replacement Of Defective Worn Out Parts Of On Load Tap Changer Of 33Kv 3 3Kv 2000Kva Transformers At Verna Pumping Station . Submission Date for this Tender is 10-06-2022. Railway Ancillaries Tenders in South Goa Goa. Bidders can get complete Tender details and download the document.
| Sl. No. | Item Description |
| 1 | Servicingof On Load Tap Changer make CTR, type EN 16 , of2000KVA,33KV/3.3KV transformerat Verna pumping stationbyexperiencedtechnician. The transformer and OLTC" shall be safely disconnected from the HT supply and shall beearthed onHV and LV sides oftransformers. The detailed scope of work is as under : |
| 2 | a)Visual checking&functioning ofOLTCDrive mechanismparts i) Electrical connections ,ii)Heater, thermostat & switch, iii) Contactor operation,iv) Motor & gear operation, v) Motor protective relay operation,Aux. transformer, vi)Limit switch operation,vii) energy accumulation spring function, viii) DM box door gasket,ix) Condition ofsealing gasketsincludingLubrication/ greasing all gears teeth, Geneva lockingfaces , mechanical contactsand bearing surfaces, wipingtap position indicator dial switch fixed studs and smearinga electrolube oil. |
| 3 | b) Overhauling ofSelector/Diverter Switch : i) Checking Carbon deposition in selector switch chamber and cleaning the selector switch chamber ii) Cheking the erosion of fixed/moving contacts, iii)Checking tightness of OLTC contacts and phase board assembly.iv) Checking tightness ofCoppertubes, taper pins and bushings board assembly, v) Checking tightness of Epoxy Arm assembly ( Main Moving and Resitance Moving Contacts) , vi) Cleaning of selector switch contacts, vii) Closing OLTC top Cover, ix) replacing OLTC top cover gasket , x) checking forlead clearance xi) Removingall carbon depositswith clean cloth before filtering, c) Operationalcheckingand testing of :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 of drive Machanism ,etc. Complete as directed by Engineer in charge. |
| 4 | Filtration of oil of2 Nos.On Load TapChanger of33KV/3.3KV, 2000KVA outdoor transformers at VernaPumping Station. |
| 5 | Supply, Replacement/Topingupof transformer oil make Power oil for 2Nos.On load Tap Changers of33KV/3.3KV, 2000KVA transformers at Verna pumping station. |
| 6 | Supplyand Replacementof defective/worn out parts ofOn load tap changersmoving machanism, type EN 16 , CTR make as mentioned below: |
| 7 | i) Main Moving ContactAssy. |
| 8 | ii) Resistor Moving Contact assy. |
| 9 | iii) Fixed Contact assembly. |
| 10 | iv) Epoxy Arm Assembly For |
| 11 | v) Top/Bottom Gasket |
| 12 | vi) Oil Seal assembly |
| 13 | vii) Hardware |
| 14 | viii) Copper Braided Wire |
| 15 | ix) Pivot Pin |
| 16 | x) Tapper Pin |
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