三相鼠笼式异步电动机等值电路参数的试验方法

CONTENTS

FOREWORD ........................................................................................................................... 4 INTRODUCTION ..................................................................................................................... 6 1 2 3

Scope ............................................................................................................................... 7 Normative references ....................................................................................................... 7 Terms, definitions and symbols ........................................................................................ 7 3.1 Symbols .................................................................................................................. 7

3.2 Subscripts ............................................................................................................... 9 3.3 Winding connection ................................................................................................. 9 Test requirements ............................................................................................................ 9 4.1 4.2 4.3

General ................................................................................................................... 9 Frequency and voltage ............................................................................................ 9 Instrumentation ..................................................................................................... 10 4.3.1 Measuring instruments for electrical quantities, speed and frequency ........ 10 4.3.2 Instrument transformers ............................................................................. 10 4.3.3 Temperature measurement ........................................................................ 10 Approximations and uncertainties ................................................................................... 10 Test procedures ............................................................................................................. 11 6.1 6.2 6.3 6.4 6.5 6.6

General ................................................................................................................. 11 Stator d.c. line-to-line resistance measurement ..................................................... 11 Load-test at rated load .......................................................................................... 11 Load curve test ..................................................................................................... 11 No-load test........................................................................................................... 12 Reverse rotation and locked rotor tests ................................................................. 12 6.6.1 General ..................................................................................................... 12 6.6.2 Reverse rotation test ................................................................................. 12 6.6.3 Locked rotor test ....................................................................................... 13 Determination of motor quantities ................................................................................... 13 7.1 7.2 7.3 7.4

General ................................................................................................................. 13 Resistance of stator winding Rs ............................................................................. 15 Total stator inductance Lts = Lm + Ls .................................................................... 15 Equivalent resistance of iron losses Rfe .............................................................. 16 7.4.1 Constant losses ......................................................................................... 16 7.4.2 Friction and windage losses ...................................................................... 17 7.4.3 Iron losses ................................................................................................. 17 Total leakage inductance L .................................................................................. 17 7.5.1 General ..................................................................................................... 17 7.5.2 Distribution of leakage inductances between stator and rotor .................... 18 7.5.3 Determination of total leakage inductance from a reverse rotation or

locked rotor test (6.6) ................................................................................ 18

7.5.4 Determination of total leakage inductance from a load curve test (6.4) ...... 19 Magnetizing inductance Lm and voltage Um .......................................................... 21 7.6.1 From a reverse rotation or locked rotor test (6.6) ....................................... 21 7.6.2 From a load curve test (6.4) ....................................................................... 21 Stator and rotor leakage inductances Ls and Lr’ .................................................... 22 7.7.1 From a reverse rotation or locked rotor test (6.6) ....................................... 22 7.7.2 From a load curve test (6.4) ....................................................................... 22

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7.5

7.6

7.7