IEC 60034-2-2:2010 pdf download.Rotating electrical machines — Part 2.2: Specific methods for determining separate losses ot large machines from tests — Supplement to IEC 6OO3421.
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 recognize
The specific methods described are:
— Calibrated-machine metho
— Retardation metho
— Calorimetric metho
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.
5.1 Direct and indirect efficiency determination Tests can be grouped in the following categories.
5.1.1 Direct
Input-output measurements on a single machine are considered to be direct. This involves the measurement of electrical or mechanical power into, and mechanical or electrical power out of a machine.
5.1.2 Indirect
Measurements of the separate losses In a machine under a particular condition are considered to be indirect. This is not usually the total loss but comprises certain loss components. The method may, however, be used to calculate the total loss or to calculate a loss component.
The determination of total loss shall be carried out by one of the following methods:
5.1 Direct and indirect efficiency determination Tests can be grouped in the following categories.
5.1.1 Direct
Input-output measurements on a single machine are considered to be direct. This involves the measurement of electrical or mechanical power into, and mechanical or electrical power out of a machine.
5.1.2 Indirect
Measurements of the separate losses In a machine under a particular condition are considered to be indirect. This is not usually the total loss but comprises certain loss components. The method may, however, be used to calculate the total loss or to calculate a loss component.
The determination of total loss shall be carried out by one of the following methods:
a) Frictfon and windage loss at rated speed (when the test machine is not electrically connected);
b) Active iron loss, and additional open-circuit losses in c. and synchronous machines, (when tested at no-load, open-circuit, excited at rated voltage, minus the windage and friction loss). Field losses from a separate source;
C) Armature-winding loss and additional-load loss in synchronous machines, (when tested under short-circuit conditions, excited at rated armature current, minus the windage and friction loss). Field losses from a separate source.
7.2 Retardation method
The retardation method can be used in determining the separate losses of rotating electrical machines having an appreciable rotational inertia.
The retardation method is used to determine:
— sum of the friction loss and windage loss (“mechanical losses”) in machines of all types;
— sum of losses in active iron and additional open-circuit losses in c. and synchronousv.IEC-60034-2-2-2010