Division 3 MEASUREMENTS AND DETERMINATION OF THE EFFICIENCY
United Kingdom
The efficiency of the efficient alternator shall be determined in accordance with ISO 8854:2012, with the exception of the elements specified in the present paragraph.
The measurements shall be conducted at different operating points i, as defined in Table 1. The alternator current intensity is defined as half of the rated current for all operating points. For each speed the voltage and the output current of the alternator are to be kept constant, the voltage at 14,3 V.
Table 1
Operating points
| Operating pointi | Holding time[s] | Rotational frequencyni [min– 1] | Frequencyhi |
|---|---|---|---|
| 1 | 1 200 | 1 800 | 0,25 |
| 2 | 1 200 | 3 000 | 0,40 |
| 3 | 600 | 6 000 | 0,25 |
| 4 | 300 | 10 000 | 0,10 |
The efficiency shall be calculated in accordance with to Formula 1.