standards / manuals / guidelines for small hydro development - AHEC

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Example :- Circuit Breaker Rating for hydro electric power system shown in fig. 3.5 isproposed to be determined.100MVA;11kV WATER WHEELGENERATOR WITH DAMPER WINDINGAND HIGH RESISTANCE GROUNDINGGGGEN. CIRCUIT BREAKER100MVA;11/132kVTRANSFORMERX = 12%A132kV BUSM60km 132kV DOUBLE CIRCUIT LINESBX 1 = 8%OPENEQUIVALENT SYSTEMX 1 = 0.03X 1 = 8%132kV BUSFig. 3.54-23
Datai) Sub transient reactance of generator on own base - 24%ii) 100 MVA transformer impedance - 12%iii) 132 KVA transmission lines impedance - 8%iv) Power house is interconnected with grid at bus B.v) Equivalent system X 1 = 0.03 of X 0 = 0.041. Consider the fault at M which is fed by the grid system and the hydrogeneratorswhich is considered worst.2. Three phase fault calculations:- In the system shown in figure 4.5 per unitreactances are indicated.Apparent power is 100 MVA base and nominal voltage 132 kV is used as base at alllevels. 0.24 0.12 x0.08 0.032 2X 1 = 0.24 0.12 0.08 0.03 2 2 =0.18x0.110.18 0.11= 0.068X 1 =0.24X 1 =0.12X 1 =0.24X 1 =0.12X =0.08 1OPENX 1=0.03X 1 =0.08Base voltage 132 kVBase current 437The value of operating voltage corresponding to the highest operating voltage at faults is145 kV or 1.098/unit1.098Isc = x 437 = 7056A0.0683. Single line to ground fault current4-24
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Section -1Guide for Design of Outdo
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The terms atmospheric overvoltages
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Table 2.31. Basic Data Example 1.Hi
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Spark gaps specified for fitting to
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2.4.2 Working Safety Clearances125
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Highest System Voltage rating kV Sp
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2.6 Insulator TypeTypes of insulato
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Bending .. .. 1265 kg/sq.cm.Shear .
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v) Installations in difficult site
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During maintenance, it is essential
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Areva Compact Air Insulated Substat
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The bus bar sizes should meet the e
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disconnect switch contacts in such
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(iv)Electro magnetic type interlock
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) Temperature rise of 11 kV Class C
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4.6 TestsThe CTs shall be provided
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10. 1.2/50 micro seconds impulse 32
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7.0 Lightning ArrestorsLightning ar
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and this aspect has to be kept in m
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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 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: to earthxvii. Difference in the ins
Page 97 and 98: Annexure-1Current waveAA = envelop
Page 99: Annexure-3Fig. 3.3 Arc extinction4-
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