Medium Voltage Application Guide

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SCHEMATIC DIAGRAMS 5 Schematic Diagrams 5.1 Electrical Symbols - Common Switching Functions The following table shows the standard IEC and ANSI symbols for common switching functions IEC 60617-2 is a European standard. ANSI Y32.2 is a North American standard. As a general rule, countries using a 50 Hz supply normally adhere to IEC standards and countries using a 60 Hz supply normally adhere to ANSI standards. Designation and symbol (IEC) Disconnector Symbol (ANSI) Function Switches operating current Isolates Switches fault current Earthing disconnector Earths (short circuit making capacity) Switch Switches Disconnector switch Switches and isolates Fixed circuit breaker Switches and protects Withdrawable circuit breaker Fixed contactor Switches and protects; isolates if withdrawn Switches Withdrawable contactor Switches; isolates if withdrawn Fuse Protects but does not isolate (once) Page 172 Medium Voltage Application Guide 710-12280-00A
14040.A SCHEMATIC DIAGRAMS 5.2 Circuit Breaker Control (Typical) This information focuses on the double command operated (DCO) method of circuit breaker control. DCO control uses normally-open momentary contacts (ie pushbuttons) or a bistable relay to operate the shunt closing and opening coils. Some circuit breakers use voltage fed open and close command signals while others use volt-free signals. Medium voltage circuit breakers can be vacuum or gas (SF6) insulated, with magnetic or motor charged spring operation. Here are some examples of various double command operated (DCO) control methods: Motor operated circuit breaker using voltage fed open and close command signals via momentary contact pushbuttons 1 6 5 Auxiliary supply Motor (spring charge) Close shunt coil Open shunt coil MS MC MO Circuit breaker controller External trip contact (eg from MPR) 2 3 4 Magnetic operated circuit breaker using volt-free open and close command signals via bistable relay contacts Auxiliary supply S1 KA1 4 Circuit breaker control (open/close) Circuit breaker controller Q1-1 Q1-2 External trip contact (eg from MPR) 1 A B Control supply Command inputs (common, close, open) A B 3 KA1 14041.A 2 710-12280-00A Medium Voltage Application Guide Page 173
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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
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SWITCHGEAR Current Transformers A c
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Flux () SWITCHGEAR Exercises 1. A C
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SWITCHGEAR Class type Use a meterin
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SWITCHGEAR Exercise 2: Protection C
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SWITCHGEAR NEMA/IEEE Ratings These
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13752.A SWITCHGEAR flux). The secon
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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
Page 136 and 137: SWITCHGEAR Exercise A 17.5 kV secon
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Page 140 and 141: SWITCHGEAR Exercise Calculate the t
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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
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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 176 and 177: 14043.A 14042.A SCHEMATIC DIAGRAMS
Page 178 and 179: 14046.A 14045.A SCHEMATIC DIAGRAMS
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 ....
Page 212 and 213: 2. DOCUMENTATION Documentation 2.1
Page 214 and 215: 3.2.2 MV Equipment a) Circuit break
Page 216 and 217: ELECTRICAL SUPPLY 9. Circuit breake
Page 218 and 219: RESOURCES 6.2 Metric/Imperial Conve
Page 220 and 221: RESOURCES 6.4 Incoterms Internation
Page 222 and 223: RESOURCES kW Active power unit LRC
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Medium Voltage Application Guide

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