EN 61986:2002

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
Annex ZA (normative) Normative references to
         international publications with their
         corresponding European publications

Applies to machines covered by EN 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.