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Fig. 3.5 Short-line fault circuit5.13 Rated Supply Circuit characteristicsVoltage equal to the phase-to-earth voltage V/3 corresponding to the rated voltage V ofthe circuit breaker.Short circuit current, in case of terminal fault, equal to the rated short circuit breakingcurrent of the circuit breaker.Prospective transient recovery voltage, in case of terminal fault, given by the standardvalues in IS: 13118.5.14 Rated line CharacteristicsStandard values of rated surge impedance rated peak factor and time should be takenfrom IS: 13118.5.15 Rated out –of-phase breaking currentRated out –of-phase breaking current is required to be specified for generator breaker andas per IS 13118. This provision will provide with following.i) The power frequency recovery voltage should be 2.0/3 times the rated voltagefor earthed neutral systems and 2.5/3 times the rated voltage for other systems.ii) The rated out-of-phase breaking current should be 25% of the rated short-circuitbreaking current.iii) Transient recovery voltage as pre IS: 13118.5.16 Rated Line Charging Breaking CurrentRated Line Charging Breaking Current is required to be specified for feeder circuitbreakers. Standard value of line charging capacity of circuit breakers for thecommonly used voltages are as follows:Table 3.3Rated voltage (kV) Rated line-charging breaking current (A)12 2.536 4072.5 40145 50245 125This implies for overhead line length equal to 1.2 times the rated voltage of the circuitbreaker in kilovolts. In case line length is longer than it may be necessary to specify ahigher value of line charging capacity.4-13
5.17 Rated time quantities and operating sequenceRated values to be assigned to the following time quantities (fig. 3.6) will depend uponrated supply voltage reclosing operations etc.Opening time;Break time;Closing time;Open-close time;Reclosing time;Close-open time;Rated operating sequence is defined as follows:-o – t – co - t´ - coWhereo - opening operationco - closing operation followed immediately by an opening operation(without internal time delay)t,t´ - time interval between successive operation/ t& t˝ are in minutes orsecondsPower circuit breakers are rated for interrupting ability on the basis of a standardoperating duty.4-14
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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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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 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: Effect of circuit conditions on rec
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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