standards / manuals / guidelines for small hydro development - AHEC

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Zero sequence impedance would be that of transformers above as 12 % on 100 MVA.Impedance X of diagram is shown in figure.X 0 = 0.04 0.24 x0.120.04 0.240. 12=0.28x0.120.28 0.12= 0.0840.240.12X 0 = 0.040.24Since X 0 is greater than X 1 , single line to ground fault need not be considered.4. Selection of Breaker rating as per IEEE std. 37010-1999.Load current =437 x 2 = 874ARated normal continuous current =As per table Xc of IS 131181250ARated short breaking current = 20,000A at 145 kVThree phase short circuit current is 7056A is less than 80% of symmetrical interruptingcapability ( 16,000A) and large growth margin exists; the 132 kV breakers at step upsub station are rated 1250A; with rated short circuit breaking current of 20,000A.Rating as per earlier AIEEE Committee methodMaximum initial symmetrical current =7050ARating for 5 cycle breakers & factor = 1.1and mandatory duty factor = 1.6short circuit rating = 7050 x 1.1 x 1.6= 12419Aand for 3 cycle breakers = 134547.5According 20,000 kA; 1250 A breakers as O. K.4-25
Annexure-1Current waveAA = envelop of current waveBB´BX = normal zero lineCC´ = displacement of current wave zero line at any instantDD´ = r.m.s. value of the ac component of current at any instant, measuredfrom CCÉE´ = instant of contact separation (initiation of the arc)I AC = peak value of ac component of current at instant EEÍ AC /2 =r.m.s. value of ac component of current at instant EEÍ Dc = d.c. component of current at instant EEÍDCx100IAC= percentage value of the d.c. componentFig. 1 short-circuit making and breaking currents, and of percentage d. c. component(IS: 13118).4-26
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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
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Fig. 12.4 Layout of 72.5 kV Switchy
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Page 47 and 48: Fig. 12.6:145 kV Outdoor Switchyard
Page 49 and 50: Fig. 12.7: 245 kV Outdoor Switchyar
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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: Datai) Sub transient reactance of g
Page 99: Annexure-3Fig. 3.3 Arc extinction4-
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