GAIL (India) Limited

233.4 General:3.4.1 The transformer shall be guaranteed for a period of 12 months from the date of commissioning. Thecontractor shall repair/replace the damaged equipment without my extra cost.4. HT and LT cables.HT and LT cables shall be of the sizes as indicated in the schedule and schematic drawing and shall bearthe ISI mark. Laying of cables shall conform to the specification detailed in cables laying section.5. Installation, testing and commissioning of sub-station Equipment:5.1 General:The installation of various sub-station equipments shall be carried out in accordance with the workingdrawings, relevant Indian Standards, code of practice and manufacturers instruction.The installation shall be in accordance with IE rules and the regulations of either local electricity authoritywhich ever is applicable. The installation, testing and commissioning of various sub-station equipmentsshall also be carried out as per the details briefly described in the subsequent paragraphs.5.2 LT panels:5.2.1 Site inspectionThe switchboards shall be supplied by the supplier in a properly packed condition. After ascertaining thatthere is no damage to the packing, all the items shall he inspected after unpacking. It shall he ensured thatthe switch boards arc in accordance with the requirements as described in the schedule and drawings. Itshall also be ensured that all the meters, relays, indication lamps etc. are in good condition and have notsuffered any damage during transit.5.2.2 Installation: The switchboard shall be assembled together in case the switchboard is supplied insection. The switchboard shall be installed in position and levelled on the foundation as per theinstallation drawings furnished by the manufacturer. The busbar of the sections shall be properlyconnected and checked for tightness after installation. The cable termination shall be carried out inaccordance with the relevant standards and the cable end box shall be sealed. The switch board shall beearthed by means of two independent earth strips of sizes as indicated in the working drawn in theschedule. It shall be ensured that 15mm thick rubber matting of an approved make is provided in front ofthe full length of the switch board. The width of the matting shall be 1 000 mm and shall withstand 1500V for one minute.5.2.3 Testing and commissioning: The following tests shall be carried out on the switchboards at thesight prior to commissioning:i) Insulation resistance between phases and individual phase and earthii) DI-electric strength of circuit breaker oil shall be checked in accordance with relevant ISiii) Earth continuityiv) Earth Resistancev) All protective relays and tripping mechanism shall be checked for their proper operation5.3 Transformer:5.3.1 Site Inspection: The transformer shall be inspected at site to ascertain that there is no damage to any ofthe components and accessories of the transformer. Normally inspection manual will be supplied by themanufacturer. The instruction given in the instruction manual shall be followed.