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BS EN 60034-28:2013

BS EN 60034-28:2013

$167.15

Rotating electrical machines – Test methods for determining quantities of equivalent circuit diagrams for three-phase low-voltage cage induction motors

Published By Publication Date Number of Pages
BSI 2013 34
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IEC 60034-28:2012 applies to three-phase low-voltage cage induction motors of frame numbers 56 to 400 as specified in IEC 60072-1. This standard establishes procedures to obtain values for elements of single phase equivalent circuit diagrams from tests and defines standard elements of these diagrams. This edition includes the following significant technical changes with respect to the previous edition: – the formulae are now all given for equivalent star-connection equivalent circuit diagrams; – procedures for the determination of equivalent circuit parameters from a load curve test as an alternative to the reverse rotation and locked rotor tests have been added.

PDF Catalog

PDF Pages PDF Title
6 English
CONTENTS
8 INTRODUCTION
9 1 Scope
2 Normative references
3 Terms, definitions, symbols and conventions
3.1 Terms and definitions
10 3.2 Symbols
11 3.3 Subscripts
3.4 Winding connection
12 4 Test requirements
4.1 General
4.2 Frequency and voltage
4.3 Instrumentation
4.3.1 Measuring instruments for electrical quantities, speed and frequency
4.3.2 Instrument transformers
4.3.3 Temperature measurement
5 Approximations and uncertainties
13 6 Test procedures
6.1 General
6.2 Stator d.c. line-to-line resistance measurement
6.3 Load-test at rated load
14 6.4 Load curve test
6.5 No-load test
15 6.6 Reverse rotation and locked rotor tests
6.6.1 General
6.6.2 Reverse rotation test
6.6.3 Locked rotor test
7 Determination of motor quantities
7.1 General
16 Figure 1 – Type-T equivalent circuit diagram
Figure 2 – Type-T equivalent circuit diagram (iron losses disregarded)
Figure 3 – Type-L equivalent circuit diagram (iron losses disregarded)
17 7.2 Resistance of stator winding Rs
7.3 Total stator inductance Lts = Lm + Lσs
7.3.1 General
7.3.2 Determination procedure
Figure 4 – Type-Γ equivalent circuit diagram
18 7.4 Equivalent resistance of iron losses RfeΓ
7.4.1 Constant losses
Figure 5 – Typical characteristics of inductance L over current I
19 7.4.2 Friction and windage losses
7.4.3 Iron losses
20 7.5 Total leakage inductance Ltσ
7.5.1 General
7.5.2 Distribution of leakage inductances between stator and rotor
7.5.3 Determination of total leakage inductance from a reverse rotation or locked rotor test (6.6)
7.5.3.1 General
7.5.3.2 Determination procedure
21 7.5.3.3 Current displacement correction by calculation
7.5.3.4 Current displacement correction by measurement
22 7.5.4 Determination of total leakage inductance from a load curve test (6.4)
23 7.6 Magnetizing inductance Lm and voltage Um
7.6.1 From a reverse rotation or locked rotor test (6.6)
7.6.2 From a load curve test (6.4)
24 7.7 Stator and rotor leakage inductances Lσs and Lσr’
7.7.1 From a reverse rotation or locked rotor test (6.6)
7.7.2 From a load curve test (6.4)
7.8 Inductances for calculations at constant flux (rated load)
25 7.9 Resistance of rotor cage Rr’ referred to the stator winding and frequency
27 7.10 Equivalent resistance of iron losses Rfe
28 Annex A (informative) Sample calculation

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BS EN 60034-28:2013
$167.15