standards / manuals / guidelines for small hydro development - AHEC

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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
Fig. 12.1: Layout of 12 kV Agnoor SHP SubStation2-19
Page 2 and 3: Section -1Guide for Design of Outdo
Page 4 and 5: The terms atmospheric overvoltages
Page 6 and 7: Table 2.31. Basic Data Example 1.Hi
Page 8 and 9: Spark gaps specified for fitting to
Page 10 and 11: 2.4.2 Working Safety Clearances125
Page 12 and 13: Highest System Voltage rating kV Sp
Page 14 and 15: 2.6 Insulator TypeTypes of insulato
Page 16 and 17: Bending .. .. 1265 kg/sq.cm.Shear .
Page 18 and 19: v) Installations in difficult site
Page 20 and 21: During maintenance, it is essential
Page 22 and 23: Areva Compact Air Insulated Substat
Page 24 and 25: The bus bar sizes should meet the e
Page 26 and 27: disconnect switch contacts in such
Page 28 and 29: (iv)Electro magnetic type interlock
Page 30 and 31: ) Temperature rise of 11 kV Class C
Page 32 and 33: 4.6 TestsThe CTs shall be provided
Page 34 and 35: 10. 1.2/50 micro seconds impulse 32
Page 36: 7.0 Lightning ArrestorsLightning ar
Page 39: and this aspect has to be kept in m
Page 43 and 44: Fig. 12.4 Layout of 72.5 kV Switchy
Page 45 and 46: 464006800 7600 3000LA30002000 2000X
Page 47 and 48: Fig. 12.6:145 kV Outdoor Switchyard
Page 49 and 50: Fig. 12.7: 245 kV Outdoor Switchyar
Page 51 and 52: 2-20
Page 53 and 54: 3.0 Transformer RatingThe full load
Page 55 and 56: OFAFOil Immersed with forced oil ci
Page 57 and 58: The transformer may be operated wit
Page 59 and 60: 8.10 Parallel OperationThe transfor
Page 61 and 62: (a)(b)33 kV Transformers (MVA)1.001
Page 63 and 64: (e)(f)(g)(h)(i)(j)(k)(l)(m)(n)(o)(p
Page 65 and 66: 18.0 Oil Containment and Fire Prote
Page 67 and 68: ) The limits of temperature rise me
Page 69 and 70: Example Calculation -1Generator Tra
Page 71 and 72: TRANSFORMER RATING AND CHARACTERSTI
Page 73 and 74: 3.0 Type of Circuit BreakerFollowin
Page 75 and 76: iii) during arcing of SF6 breaker,
Page 77 and 78: 3.4 Protection Classes for Switchge
Page 79 and 80: The rated voltage is expressed in k
Page 81 and 82: 5.7 Rated Short Circuit Making Curr
Page 83 and 84: Effect of circuit conditions on rec
Page 85 and 86: 5.17 Rated time quantities and oper
Page 87 and 88: 25405017.5 812.516254024 812.516254
Page 89 and 90: component of fault current in addit
Page 91 and 92:
Steps involved in applying method a
Page 93 and 94:
to earthxvii. Difference in the ins
Page 95 and 96:
Datai) Sub transient reactance of g
Page 97 and 98:
Annexure-1Current waveAA = envelop
Page 99:
Annexure-3Fig. 3.3 Arc extinction4-
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