Medium Voltage Application Guide

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13854.A 13852.A 13853.A SWITCHGEAR Short circuit impedances and ratings of switchgear devices Device Equivalent circuit Short circuit impedance () CB1 Transient stage Break rating (kA rms) Make rating (kA peak) Z G Subtransient stage CB2 Z NET Z TR I sc2 CB3 Z NET Transient stage Z G (Z NET Z TR ) Z G (Z NET Z TR ) Z G Z TR Subtransient stage Case 2 1 Source Source (Network): U p = 36 kV = 1000 MVA S sc TR Feeder Transformer (TR): U p = 36 kV U s = 11 kV @ 50 Hz S = 20 MVA Z% = 10% Motor (M): U = 11 kV @ 50 Hz P = 2000 kW I sc3 2 CB1 I sc1 CB2 CB3 14006.A I sc3 M For the purposes of this calculation, ignore all impedances of circuit breakers, cables and busbars. The first step is to calculate the individual impedances. Page 160 Medium Voltage Application Guide 710-12280-00A
13929.A 13928.A 13853.A SWITCHGEAR Motor impedance (Z M ): U 2 200 P 11 2 200 2000 12.1 The motor impedance is 12.1 . Transformer impedance (Z TR ): Network impedance (Z NET ), as seen on the secondary side of the transformer: The permanent impedance is 0.6 . 36 2 1000 11 2 36 The permanent impedance is 0.12 . Short circuit impedances and ratings of switchgear devices Device Equivalent circuit Short circuit impedance () CB1 Break rating (kA rms) Make rating (kA peak) Z M CB2 Z NET Z TR I sc2 CB3 Z M Z NET Z TR Z M (Z NET Z TR ) Z M (Z NET Z TR ) I sc3 710-12280-00A Medium Voltage Application Guide Page 161
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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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13684.A Maximum cut-off current (kA
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13688.A 13689.A 13691.A 13690.A 136
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SWITCHGEAR IEC Ratings Disconnector
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Pre-arcing time (seconds or minutes
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SWITCHGEAR Nominal current, In (A)
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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 128 and 129: Incomer feeder panel Transformer Mo
Page 130 and 131: SWITCHGEAR Many manufacturers use a
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Page 134 and 135: Magnitude of overvoltage /p.u. Line
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Page 140 and 141: SWITCHGEAR Exercise Calculate the t
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Page 146 and 147: 13847.A SWITCHGEAR The calculated s
Page 148 and 149: SWITCHGEAR Transformer internal imp
Page 150 and 151: SWITCHGEAR Exercise For a motor run
Page 152 and 153: SWITCHGEAR The total coefficient fa
Page 154 and 155: SWITCHGEAR Short-time withstand cur
Page 156 and 157: 14009.A SWITCHGEAR Mechanical stren
Page 158 and 159: SWITCHGEAR Resonant frequency The b
Page 160 and 161: Current 13850.A SWITCHGEAR Synchron
Page 164 and 165: SWITCHGEAR 4.6 Switchgear Inspectio
Page 166 and 167: SWITCHGEAR Commissioning Tools and
Page 168 and 169: SWITCHGEAR 62271-302 High voltage s
Page 170 and 171: 13856.A 13855.A SWITCHGEAR 4.9 IEC
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
Page 198 and 199: ENVIRONMENTAL SPECIFICATIONS The eq
Page 200 and 201: LOGIC CONTROL CONFIGURATION 3.2 Ope
Page 202 and 203: LOGIC CONTROL CONFIGURATION 3.6 Met
Page 204 and 205: SPECIFICATION: Power factor Correct
Page 206 and 207: 1 INTRODUCTION Introduction 1.1 Sco
Page 208 and 209: 3 SUPPORT AND SERVICES Support and
Page 210 and 211: 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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