standards / manuals / guidelines for small hydro development - AHEC

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eakera. one minute dry and wet powerfrequency withstand voltagei. to earth (breaker closed)ii. across terminals of open circuitbreaker325 kVp140 kV rms140 kV rmsvi. Rated normal current at site conditions 1600 A 630 Avii. Rated line charging breaking current Not less than 10A. 100 Acorresponding switchingover voltage values online side & supply sideto be intimated by thetendererviii.Rated short circuit breaking currenta) rms value of AC component ( ratedshort circuit current )b) percentage D.C. component31. 5 KA at 72. 5 KVAs per IEC-56 (Latestedition)ix. First pole to clear factor 1.5x. Rated transient recovery voltage for As per IEC –56 (latestterminal faultsedition)a) corresponding to rated short circuitbreaking current (Symmetrical & -do-Asymmetrical)b) Corresponding to currents below therated & short circuit currentxi.Breaking capacity under short line faultconditions with rated supply side andline side characteristics-do-xii. Rated short circuit making current 78. 75 KA peakat 72. 5 kVxiii. Rated operating sequence Break dead Time-Make-Break (Minimum deadtime should not be morethan 15 cycles at 50 c/sinclusive of the time forauto reading relay. Unitof adjustment of deadtime shall be 15 to 35cycles.xiv. Total break time for any current upto Not more than 60 msrated breaking currentxv. Min. short time current rating and its 31.5 kA for 3 sec.durationxvi Minimum total creepage distance phase 1700 mm12.5 kA at 36 kV(750 MVA) as perIS: 131182.5 times the rmsvalue of Accomponent4-21
to earthxvii. Difference in the instant ofclosing/opening of contacts of all the 3polea) Openingb) Closingxviii Small inductive current interruptingcapacityxix.Whether breaker suitable for single poleoperation or gang operation of threepolesNot more than 3.33 ms.Not more than 5 ms.Any value upto 10Awith out switching overvoltage exceeding 2.0p.u.Gang operation of threepoles throughmechanical linkagesxx. Number of trip coils Two Nos. per breaker4-22
Page 2 and 3:
Section -1Guide for Design of Outdo
Page 4 and 5:
The terms atmospheric overvoltages
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Table 2.31. Basic Data Example 1.Hi
Page 8 and 9:
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
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 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: Steps involved in applying method a
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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