Medium Voltage Application Guide

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SWITCHGEAR Exercise A 17.5 kV secondary distribution, indoor switchgear system requires MO arrestors to be fitted on the incomer side. The system supply is 15 kV/50 Hz and is isolated from earth. Use calculated ratings and the manufacturers’ data sheet for selection. The highlighted numbers 1~4 refer to the solution page. Step 1: Calculate the MO arrestor ratings Continuous operating voltage For an isolated earthed neutral system, continuous operating voltage (U c ) ≥ system voltage (U s ) U c ≥ 15 kV Rated voltage Rated voltage (U r ) ≥ 1.25 times continuous operating voltage (U c ) U r ≥ 1.25 x 15 U r ≥ 18.75 kV Nominal discharge current For a secondary distribution system, use a lightning-impulse nominal discharge current rating (I n ) of 10 kA. Residual protection voltage The residual protection voltage (U res ) developed across the MO arrester, when discharging 10 kA, must be less than 70% of the equipment lightning-impulse rating (U p ) U res U p x 0.7 95 x 0.7 66 kV Step 2: Using the calculated ratings, select an MO arrestor from the manufacturer's data sheet Page 134 Medium Voltage Application Guide 710-12280-00A
SWITCHGEAR Solution: A type MWD15 meets the selection criteria. Source: example data based on ABB MWD surge arrestors 710-12280-00A Medium Voltage Application Guide Page 135
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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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Page 174 and 175: SCHEMATIC DIAGRAMS 5 Schematic Diag
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Page 184 and 185: 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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