Medium Voltage Application Guide

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13761.A 13760.A 13758.A 13759.A SWITCHGEAR Overcurrent protection based on measuring the 3-phase line currents, produces positive sequence current (I 1 , indicative of phase-to-phase faults) or negative phase sequence current (I 2 , indicative of phase loss or phase imbalance). Overcurrent protection based on measuring the residual or ground current, produces zero sequence current (I 0 , indicative of ground fault or earth leakage). The configuration of the CTs depends on the functionality of the protection device: Line current protection L1 L2 L3 Line current and residual current protection L1 L2 L3 I_A I_A I_B I_B I_C I_C Io Positive sequence current, I 1 Negative sequence current, I 2 Ground current protection Positive sequence current, I 1 Negative sequence current, I 2 Zero sequence current, I 0 Ground current protection HV TXR Zero sequence current, I 0 1 MV Io Zero sequence current, I 0 Page 122 Medium Voltage Application Guide 710-12280-00A
13757.A 13756.A 13756.A SWITCHGEAR Differential In medium voltage installations, differential protection is mainly used on transformers, motors and generators. Line currents are measured on both sides of the device, to determine the difference between the input and output currents (individual or 3-phase average). If the difference exceeds a preset limit, this indicates a phase loss or short circuit fault condition. A trip will occur, isolating the affected electrical device from the rest of the system. Transformer application 2 CT1 CT2 3 3 1 4 3 HV supply Transformer Differential protection device MV supply MV motor application 1 CT1 3 2 3 M CT2 Incoming supply MV motor Differential protection device 3 MV generator application 1 CT1 3 2 3 G CT2 Output supply MV generator Differential protection device 3 Bus zone This protection is used on bus distribution systems. The 3-phase line currents are measured on all feeders connected to a busbar system. The sum of currents entering should equal the sum of currents leaving the busbar system. If the difference in individual or 3-phase average currents is not close to zero, a trip will occur. Bus configurations can be complex, but by using the status information of all the switching devices on a busbar system, logic within the protection device can selectively isolate the faulty zone. 710-12280-00A Medium Voltage Application Guide Page 123
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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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Page 88 and 89: SWITCHGEAR Causes of internal arc T
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Page 100 and 101: 13684.A Maximum cut-off current (kA
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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 128 and 129: Incomer feeder panel Transformer Mo
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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
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SCHEMATIC DIAGRAMS 5 Schematic Diag
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14043.A 14042.A SCHEMATIC DIAGRAMS
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14046.A 14045.A SCHEMATIC DIAGRAMS
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14049.A SCHEMATIC DIAGRAMS 5.5 MVS
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14051.A SCHEMATIC DIAGRAMS 5.6 MVX
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RESOURCES 6 Resources 6.1 Equipment
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CONTENTS Contents Introduction ....
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2. ENVIRONMENTAL SPECIFICATIONS Env
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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: MVX Solid State Redu
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1. 1. INTRODUCTION Introduction 1.1
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ENVIRONMENTAL SPECIFICATIONS The eq
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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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Medium Voltage Application Guide

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