Medium Voltage Application Guide

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SWITCHGEAR Exercise For a motor running at full load, calculate the full load current, the total electrical input power and the amount of full load slip, given that: P_ OUT = 2000 kW U r = 3.3 kV f = 50 Hz eff = 0.95 p.f. = 0.88 N = 1485 rpm poles = 4 Motor full load current Input power (alternative calculation) Motor slip at full load P_ IN P_ OUT P_IN N s 3U r FLCp.f. 33.34180.88 2105 kW P_ IN eff P_ OUT eff 2000 0.95 2105 kW f 120 poles 50 120 4 6000 4 1500 rpm N N N s N s 1slip 1 slip N slip 1 Ns 1485 1 1500 1 0.99 0.01 p.u. Page 148 Medium Voltage Application Guide 710-12280-00A
13857.A SWITCHGEAR Busbar Calculations Busbar calculations verify the thermal and electrodynamic design limits, and check that no resonance will occur. Thermal withstand Rated current, Ir (A) The rating of a busbar system depends on the material, shape, size and configuration of the individual busbars, as well as the operating conditions. The calculated busbar rating per phase must be greater than the maximum expected operating current. 249 . × n × S × P I = K × p20 × 1+ 20 a e 0.61 0.5 0.39 e Where I = maximum allowable current per phase (A) K = total coefficient factor = maximum allowable busbar temperature (°C) n = nominal ambient temperature (40 °C) p20 = resistivity at 20 °C: copper = 1.83 cm; aluminium = 2.90 cm α = temperature coefficient of resistivity = 0.004 P = busbar perimeter, 2(e+a) (cm) S = busbar cross-section, e· a (cm 2 ) The permitted busbar temperature rise is defined in IEC 62271-1. Maximum permissible temperature rise for bolt-connected devices, including busbars Material and dielectric medium Maximum permissible temperature (°C) Temperature rise above 40 °C ambient (°C) Bolted connection (or equivalent) Bare copper, bare copper alloy or bare aluminium alloy In air 90 50 In sulphur hexafluoride (SF 6 ) 115 75 In oil 100 60 Silver or nickel coated In air 115 75 In sulphur hexafluoride (SF 6 ) 115 75 In oil 100 60 Tin-coated In air 105 65 In sulphur hexafluoride (SF 6 ) 105 65 In oil 100 60 Source: derived from IEC 62271-1 NOTE When engaging parts with different coatings, or where one part is of bare material, the permissible temperature and temperature rise shall be those of the surface material having the lowest permitted value. 710-12280-00A Medium Voltage Application Guide Page 149
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Medium Voltage Application Guide
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CONTENTS 4 Switchgear .............
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INTRODUCTION 1 Introduction This re
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03340.B Current Torque MOTORS magne
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Torque Current MOTORS Typical start
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03340.B Current Torque MOTORS 2.2 M
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13190.A Current Torque 13193.A Curr
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MOTORS How does soft start compare
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MOTORS Soft starters Electronic sof
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MOTORS Bypassed VFD installation 1
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13473.A SOFT STARTERS Open loop sof
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SOFT STARTERS 3.2 Benefits Electric
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13490.A 13489.A SOFT STARTERS Snubb
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SOFT STARTERS Enclosed soft starter
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12996.A SOFT STARTERS Local control
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SOFT STARTERS Key Features MVS soft
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SOFT STARTERS Vibration ...........
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SOFT STARTERS MVX Soft Starter Over
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SOFT STARTERS General Technical Dat
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11083.B 11082.B SOFT STARTERS Power
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13015.A 13013.A SOFT STARTERS Soft
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SOFT STARTERS Predictive Maintenanc
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SOFT STARTERS Medium voltage starte
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STAR T STO P RESET INPU TA INPU T B
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Ready R un Trip Local 11081.C SOFT
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13522.A 13521.A 13513.A SOFT STARTE
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09593.A Current SOFT STARTERS AC53
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09678.B Current Torque (% motor ful
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13634.A 13633.A Current (%FLC) Torq
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SOFT STARTERS Example Calculate the
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SOFT STARTERS Operating Sequence NO
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13530.A SOFT STARTERS Typical multi
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SOFT STARTERS AuCom multi-motor sta
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13531.A SOFT STARTERS Slip ring mot
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SOFT STARTERS 3.8 Common standards
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11158.A SWITCHGEAR 4.1 Switchgear C
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SWITCHGEAR ANSI-defined switchgear
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11165.A 11163.A SWITCHGEAR 4.2 Stan
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11169.A 11166.A SWITCHGEAR Bus Coup
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11174.A 11173.A SWITCHGEAR Metering
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SWITCHGEAR Design Busbar system des
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SWITCHGEAR Resonant frequency The b
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SWITCHGEAR Interlock scheme 1: Two
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SWITCHGEAR Causes of internal arc T
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13716.A Current 13680.A SWITCHGEAR
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11163.A SWITCHGEAR When a withdrawa
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13720.A Percentage DC component SWI
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13722.A Voltage SWITCHGEAR Transien
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13681.A SWITCHGEAR Medium Voltage C
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Page 104 and 105: SWITCHGEAR IEC Ratings Disconnector
Page 106 and 107: Pre-arcing time (seconds or minutes
Page 108 and 109: SWITCHGEAR Nominal current, In (A)
Page 110 and 111: 13745.A Fuse rating (A) 13697.A Fus
Page 112 and 113: SWITCHGEAR Current Transformers A c
Page 114 and 115: Flux () SWITCHGEAR Exercises 1. A C
Page 116 and 117: SWITCHGEAR Class type Use a meterin
Page 118 and 119: SWITCHGEAR Exercise 2: Protection C
Page 120 and 121: SWITCHGEAR NEMA/IEEE Ratings These
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Page 134 and 135: Magnitude of overvoltage /p.u. Line
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Page 172 and 173: SWITCHGEAR 4.10 Protection index IP
Page 174 and 175: SCHEMATIC DIAGRAMS 5 Schematic Diag
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Page 180 and 181: 14049.A SCHEMATIC DIAGRAMS 5.5 MVS
Page 182 and 183: 14051.A SCHEMATIC DIAGRAMS 5.6 MVX
Page 184 and 185: RESOURCES 6 Resources 6.1 Equipment
Page 186 and 187: CONTENTS Contents Introduction ....
Page 188 and 189: 2. ENVIRONMENTAL SPECIFICATIONS Env
Page 190 and 191: LOGIC CONTROL CONFIGURATION 3.2 Ope
Page 192 and 193: LOGIC CONTROL CONFIGURATION 3.6 Met
Page 194 and 195: SPECIFICATION: MVX Solid State Redu
Page 196 and 197: 1. 1. INTRODUCTION Introduction 1.1
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LOGIC CONTROL CONFIGURATION 3.2 Ope
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LOGIC CONTROL CONFIGURATION 3.6 Met
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SPECIFICATION: Power factor Correct
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1 INTRODUCTION Introduction 1.1 Sco
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3 SUPPORT AND SERVICES Support and
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CONTENTS Contents Introduction ....
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2. DOCUMENTATION Documentation 2.1
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3.2.2 MV Equipment a) Circuit break
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ELECTRICAL SUPPLY 9. Circuit breake
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RESOURCES 6.2 Metric/Imperial Conve
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RESOURCES 6.4 Incoterms Internation
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RESOURCES kW Active power unit LRC
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