Tender For Servicing Of 1600 Kva Transformers At Jnis- 1 TRANSFORMER SERVICING 2 Supply and delivery of new, unused, virgin mineral insulating transformer oil conforming to the latest IS standards, suitable for 11 kV / 433 V, 1600 kVA distribution transformer.The oil shall be suitable for initial filling or topping up of the transformer. The specifications as follows (1) Type Mineral insulating transformer oil – new and virgin, (2) Standard IS 335:2018 (latest) or IEC 60296 (3) Appearance Clear and free from suspended matter, sludge, or sediment, (4) Dielectric Breakdown Voltage (BDV) Minimum 60 kV (tested after filtration),(5) Specific Resistance at 90°C Not less than 35 × 1012 ohm-cm,(6) Moisture Content Less than 30 ppm,(7) Acidity (Neutralization Value) Max. 0.03 mg KOH/g,(8) Interfacial Tension Min. 0.04 N/m,(9) Flash Point (Closed Cup) Not less than 140°C,(10) Pour Point Not higher than –6°C,(11) Corrosive Sulphur Test Non-corrosive. 3 Carrying out hot oil filtration and dehydration of the insulating oil of 11 kV/433 V, 1600 kVA transformer using a high-vacuum filtration plant to restore dielectric and insulating properties of the transformer oil. The work shall include testing, filtration, and submission of results conforming to IS 335:2018 and IS 1866:2017 standards. 4 To supply and refill / replace silica gel crystals in the breather unit of a 1600 kVA, 11kV/433V oil-filled distribution transformer, ensuring proper moisture absorption andprotection of the transformer oil from humidity ingress. Work includes removal ofold, discoloured, or saturated silica gel, cleaning of breather assembly, refilling withfresh indicating silica gel, and reinstallation. 5 VCB SERVICING 6 Servicing, inspection, testing, and functional verification of 11 kV, 630 A Vacuum Circuit Breaker (VCB) associated with a 1600 kVA, 11 kV/433 V transformer. Work shall ensure reliable operation of the breaker, correction of mechanical defects, insulation health check, and satisfactory trip/close performance. 7 Supply installation testing and commissioning of automatic battery charger for 12V 60 AH battery of VCB panel 8 Supply, installation, and connection of DC control battery for operating the VCB tripping and closing circuits in an 11 kV switchgear panel. The work includes providing suitable battery capacity, mounting arrangement, wiring, testing, and commissioning. 12v, 60AH battery
