standards / manuals / guidelines for small hydro development - AHEC

10.0 Repair/Inspection FacilitiesLarge substations sometimes require the facilities of repair bay alongwith a crane ofadequate capacity for handling the heaviest equipment, which is usually the transformer.In hydropower station powerhouse crane is generally used for this purpose.Repair/service bay of powerhouse is used for repair of transformer.Provision of a rail track should be made for movement of transformer from switchyard tothe repair bay. Points for jacking, winching should be provided at the transformerfoundations and 90 0 turn on the rail track for changing the direction of the wheels.11.0 Pale FencingPale fencing around switchyard consists of 75 mm wide and 2500 mm high pales fixedon two members 45 x 45 x 6 mm angle horizontal runners. Vertical supports may be of50 x 50 x 6 mm angle. Two meter gates of approximately 4000 mm width (2000 mmwide each leaf) is normally required for entry/exist of transformers etc.12.0 Switchyard LayoutLow level layout of the switchyard of step up station should be provided. Layout ofswitchyard may be generally designed in accordance with Central Board of irrigation andpower manual on Sub-Station layout for 36 kV and above. Rural electrification standardbe adopted for 12 kV substations. Typical layouts of substations are attached as follows:12.1 12 kV outdoor switchyard with Lattice type structure recommended for hilly areas – 2 x500 kVA Agnoor SHP12.2 12 kV outdoor switchyard with pole structure – REC standard layout12.3 36 kV outdoor switchyard – single sectionalized bus (H-Type) 2 x 3.5 MW SikasarProject – 2 sheets12.4 36 kV outdoor switchyard – single bus (CBI & P Manual) – 2 sheets12.5 72.5 kV outdoor switchyard – single sectionalized bus – proposed 2 x 10 MW Mukerianproject stage –II – 2 sheets.12.6 145 kV outdoor switchyard single bus (CBI & P) manual for single sectionalized bus – 2sheets.12.7 245 kV outdoor switchyard single bus (CBI & P) manual for single sectionalized bus – 2sheets.2-18