IEC 60034-2-2 pdf download Rotating electrical machines – Part 2-2: Specific methods for determining separate losses of large machines from tests – Supplement to IEC 60034-2-1
This part of IEC 60034 applies to large rotating electrical machines and establishes additional methods of determining separate losses and to define an efficiency supplementing IEC 60034-2-1 . These methods apply when full-load testing is not practical and result in a greater uncertainty.
NOTE In situ testing according to the calorimetric method for full-load conditions is recognized.
The specific methods described are:
– Calibrated-machine method.
– Retardation method.
– Calorimetric method.
2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60034-1 , Rotating electrical machines – Part 1: Rating and performance IEC 60034-2-1 , Rotating electrical machines – Part 2-1: Standard methods for determining losses and efficiency from tests (excluding machines for traction vehicles)
3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60034-1 and IEC 60034-2-1 apply, as well as the following.
3.1 calibrated machine machine whose mechanical power input/output is determined, with low uncertainty, using measured electrical output/input values according to a defined test procedure
3.2 calibrated-machine method method in which the mechanical input/output to/from an electrical machine under test is determined from the measurement of the electrical input/output of a calibrated machine mechanically coupled to the test machine
3.3 retardation method method in which the separate losses in a machine under test are deduced from the measurements of the deceleration rate of its rotating components when only these losses are present
In addition to the symbols in IEC 60034-2-1 , the following apply.
A is an area, m 2 ,
C is the retardation constant, kg m 2 min 2 ,
c p is the specific heat capacity of the cooling medium, J/(kg K),
h is the coefficient of heat transfer, W/(m 2 K),
J is the moment of inertia, kg m 2 ,
n is the speed, min –1 ,
P 1E is the excitation power supplied by a separate source, W,
P k is the constant loss, W,
P el is the electrical power, excluding excitation, W,
P e is the excitation power, W,
P Fe is the iron loss, W,
P fw is the friction and windage loss, W,
P sc is the short-circuit loss, W,
P mech is the mechanical power, W,
P T is the total loss, W,
Q is the volume rate of flow of the cooling medium, m 3 /s,
t is the time, s,
v is the exit velocity of cooling medium, m/s,
⊗ p is the difference between the static pressure in the intake nozzle and ambient pressure, N/m 2 ,
⊗ θ is the temperature rise of the cooling medium, or the temperature difference
between the machine reference surface and the external ambient temperature, K,
δ is the per unit deviation of rotational speed from rated speed,
ρ is the density of the cooling medium, kg/m 3 ,
θ is the temperature, °C.
irs for inside reference surface,
ers for outside reference surface,
E for exciter,
c for the cooling circuit,