BS EN 60034-2-1:2014 pdf free download

BS EN 60034-2-1:2014 pdf free download.Rotating electrical machines Part 2-1: Standard methods for determining losses and efficiency from tests (excluding machines for traction vehicles).
Tests can be grouped into the three following categories:
a) input-output power measurement on a single machine. This involves the direct measurement of electrical or mechanical power into, and mechanical or electrical power out of a machine;
b) electrical input and output measurement on two identical machines mechanically connected back-to-back. This is done to eliminate the measurement of mechanical power into or out of the machine;
c) determination of the actual loss in a machine under a particular condition. This is usually not the total loss but comprises certain loss components.
The methods for determining the efficiency of machines are based on a number of assumptions. Therefore, it is not recommended that a comparison be made between the values of efficiency obtained by different methods, because the figures may not necessarily agree.
5.2 Uncertainty
Uncertainty as used in this standard is the uncertainty of determining a true efficiency. It
reflects variations in the test procedure and the test equipment.
Although uncertainty should be expressed as a numerical value, such a requirement needs sufficient testing to determine representative and comparative values.
5.3 Preferred methods and methods for customer-specific acceptance tests, field- tests or routine-tests
It is difficult to establish specific rules for the determination of efficiency. The choice of test to be made depends on the information required, the accuracy required, the type and size of the machine involved and the available field test equipment (supply, load or driving machine).
In the following, the test methods suitable for asynchronous and synchronous machines are separated into preferred methods and methods for customer-specific acceptance tests, field- tests or routine tests.
5.4 Power supply
5.4.1 Voltage
The supply voltage shall be In accordance with 7.2 (and 8.3.1 for thermal tests) of
IEC 60034-1:2010.
5.4.2 Frequency
During tests, the average supply frequency shall be within ±0,1 % of the frequency required ror the test being conducted.
5.5 Instrumentation
5.5.1 General
Environmental conditions shall be within the recommended range given by the equipment manufacturer. If appropriate, temperature corrections according to the equipment manufacturer’s specification shall be made.BS EN 60034-2-1 pdf download.