IEC 61986:2002

FOREWORD
1 Scope
2 Normative references
3 Symbols and units
4 General test requirements
5 Principle of superposition tests
   5.1 General
   5.2 Permissible temperature rise at superposition tests
6 Superposition methods for induction motors
   6.1 Method of reduced voltage and rated current
   6.2 Method of rated voltage and reduced current
   6.3 Method for wound-rotor induction motors
7 Superposition methods for synchronous machines
   7.1 Method of open circuit, short circuit, zero excitation
   7.2 Method of zero power factor and open circuit loading
8 Superposition method for d.c. machines
9 Principle of equivalent load tests
   9.1 General
   9.2 Permissible temperature rise at equivalent load tests
10 Equivalent load tests for induction motors
   10.1 Forward short-circuit test
   10.2 Modulated frequency method
   10.3 DC injection
   10.4 Mixed-frequency or bi-frequency method
11 Equivalent load test for synchronous machines - Zero power
   factor
Figures

Applies to machines covered by IEC 60034-1 when they cannot be loaded to a specific condition (rated or otherwise) for whatever reason. It is applicable to both motors and generators but the methods are not suitable for machines of and below 1 kW.Provides descriptions of various indirect load tests, the purpose of which is to determine the temperature rise of rotating electrical machines, including a.c. induction machines, a.c. synchronous machines and d.c. machines. The test methods in some cases provide, in addition, a means of measuring or estimating other parameters such as losses and vibration, but the methods are not designed specifically to provide such data.