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UL 60034-2-1-2017 pdf free download
UL 60034-2-1-2017 pdf free download.Rotating Electrical Machines — Part 2-1: Standard methods for determining losses and efficiency from tests (excluding machines for traction vehicles).
220.127.116.11 Zero power factor test
Operate the machine uncoupled as a motor, at rated speed and over-excited. Adjust the supply voltage to the same electromotive force E and armature current I (at a power factor near zero) as at the desired load.
NOTE I E is the veclonal sum of terminal voltage and Potier reactance voltage drop according to 7.26.2 of lEG 60034-4:2008.
The test shall be made as near as possible to the stabilized operating temperature attained In operation at rated load. No winding temperature correction shall be made.
For the above test, it is necessary that the supply voltage is adjustable so that the iron losses have the same value during this test as at a rated power factor under load at rated voltage. If the supply voltage is not adjustable but is equal to the rated voltage, this could give an active iron loss appreciably different from that at full-load. In principle, reactive power should be delivered (i.e. machine over-excited), but when this is impossible due to limited exciter voltage, the test may be made with reactive power absorbed (i.e. machine under-excited) as far as stable running is possible.
The excitation winding losses at the desired load will be obtained from the excitation current estimated according to 7.26.2 of IEC 60034-4:2008 (Potier diagram), or 7.26.3 (ASA diagram), or 7.26.4 (Swedish diagram).
NOTE 2 The accuracy of this method depends on the accuracy ol the wattmeters and the instrument translormers at low power facior.
Record at zero power factor:
— Li, f, I, P1,
— excitation system values according to 5.9;
— e and O.
18.104.22.168 Efficiency determination
For each desired load point, determine the efficiency with the measured values as follows:(90).
7.2.5 Method 2-1-2G — Summation of separate losses with a load test without consideration of additional load losses
The test procedure is In principle similar to method 2-1 -2B. The only difference is that the additional load losses are not considered by this method, I.e. the short circuit test for their determination is skipped. This results in a significantly lower accuracy.
Apart from that, the procedures for loss and efficiency determination are equivalent to method 2-1-2B. For an overview, Figure 26 provides a flowchart for efficiency determination by this test method.
For the procedures to determine efficiency see 7.1.3, method 2-1-2B, without consideration of the additional load loss.
This procedure is not applicable for synchronous machines with excitation by permanent magnets.UL 60034-2-1-2017 pdf free download.
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