三相鼠笼式异步电动机等值电路参数试验方法.docVIP

CONTENTS FOREWORD 4 INTRODUCTION 6 1 Scope 7 2 Normative references 7 3 Terms, definitions and symbols 7 3.1 Symbols 7 3.2 Subscripts 9 3.3 Winding connection 9 4 Test requirements 9 4.1 General 9 4.2 Frequency and voltage 9 4.3 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 5 Approximations and uncertainties 10 6 Test procedures 11 6.1 General 11 6.2 Stator d.c. line-to-line resistance measurement 11 6.3 Load-test at rated load 11 6.4 Load curve test 11 6.5 No-load test 12 6.6 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 7 Determination of motor quantities 13 7.1 General 13 7.2 Resistance of stator winding Rs 15 7.3 Total stator inductance Lts = Lm + Ls 15 7.4 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 7.5 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 7.6 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 7.7 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 7.8 Inductances for calculations at constant flux (rated load) 22 7.9 Resistance of rotor cage Rr’ referred to the stator winding and frequency 23 7.10 Equivalent resistance of iron losses Rfe 24 Annex?A (informative) Sample calculation 29 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________ ROTATING ELECTRICAL MACHINES – Part 28: Test methods for determining quantities of equivalent circuit diagrams for