standards / manuals / guidelines for small hydro development - AHEC

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Sl. Rating Type GaugeNo.Shorter axis Longer axis1. Up to 5 MVA Flat, uni-directional As per manufacturer’s practice,however, not to exceed 1000 mm2. 6.3 MVA Flanged, bi-directional 1435 mm 1435 mm3. 10 MVA and Flanged, bi-directional 1676 mm 1676 mmabove(r) Inspection cover.(s) Cooling accessoriesONAN/ONAF cooling1. Radiators with shut-off valves and air release plugs.2. Fans.3. Filter valves.4. Drain and sampling device.5. Air release device.16.0 Dielectric Tests(a)220/132 kV windingi) Lighting impulse on all the line terminals (routine test)ii) Induced over-voltage with partial discharge indication (routine test)(b)33 kV windingi) Separate source AC on the all line terminal (routine test)ii) Lightning impulse on all the line terminals (routine test)17.0 AccessoriesNormal accessories are arcing horns, oil flow alarm, fans and pumps, dissolved gasmonitoring system, Temperature detectors, Lifting devices.Provision of Following Oil preservation system are preferred for generator step-uptransformer.(i)(ii)Inert gas pressure system. Positive nitrogen gas pressure is maintained in the spacebetween the top of the oil and the tank cover from a cylinder through a pressure-reducingvalve.Air-cell, constant-pressure, reservoir tank system. A system of one or more oil reservoirs,each containing an air cell arranged to prevent direct contact between the oil and the air.3-13
18.0 Oil Containment and Fire Protection SystemIf any oil filled transformers are used in the power plant, provisions should be made tocontain any oil leakage or spillage resulting from a ruptured tank or a broken drain valve.Physical separation in the use of fire wall/barriers is also provided in power plants.Specifications for fire protection of power transformers may be provided in accordancewith CBI & P Manual on Transformer in Section ‘O’ or specification refer chapter onmechanical auxiliaries.19.0 Factory and Field TestingTransformer specifications must contain complete and exhaustive section for qualitycontrol, Inspection, factory and field test. Provision for witness testing of factory test andmethod for type test should be specified in detail. Various routine, type and special testsare detailed in IS 2026 part I. For explanations, details on the methods and procedure forcorrections when ideal test conditions cannot be achieved reference may be made to testmanual for transformers issued by CBI & P.20.0 Erection, Maintenance Testing and CommissioningRefer CBI & P manual on transformers section K entitle Erection, Maintenance andCommissioning manual.21.0 Typical Transformer rating and characteristicsTransformer rating and characteristics for a 11/66 kV transformer for Mukerain Stage-IIHEP ( 2 x 10 MW) is enclosed as Annexure 3.4.3-14
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 40: and this aspect has to be kept in m
Page 41 and 42: Fig. 12.1: Layout of 12 kV Agnoor S
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: (e)(f)(g)(h)(i)(j)(k)(l)(m)(n)(o)(p
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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