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【正文】 the voltage drop, U, caused by the equipment shall be within the range 3 % to 5 % of the test supply voltage。 Page 9 EN 61000?3?11:2020 169。 BSI 012020 d – secondly, the ratio of inductive to resistive ponents of Ztest given by Xtest / Rtest shall be within the range 0,5 to 0,75 (. similar to the ratio of the ponents of Zref). NOTE The 3 % to 5 % condition ensures that the relative current changes of the equipment in the real work situation will be nearly the same as those during the test. Test of equipment against Ztest The test shall be made with the test circuit specified in Figure 1, except that the impedance Zref is replaced with Ztest. Four values dc test, dmax test, Pst test and Plt test shall be measured. The definitions of dc, dmax, Pst, and Plt are given in IEC 6100033. Evaluation against Zref If Ztest is not equal to Zref, the measured values shall be recalculated using the following formulae: d c d c test Z ref Z test d max max test Z ref Z Pst Pst test Zref Z test Plt Plt test test Z ref Z test The values dc, dmax, Pst, Plt are similar to those which would be obtained by measurements using Zref as the conditions placed on Ztest in ensure that the modulus values of Z test and Z ref are approximately in phase and that the measured voltage, Pst and Plt values can be converted to equivalent values with reasonable accuracy by multiplying them by the ratio Zref . Z test Provided that the conditions for dc and dmax are met with Ztest, d(t) shall be deemed to be satisfied. Evaluation and declaration by the manufacturer of the maximum permissible system impedance In the calculations described in the following subclauses, the modulus values of plex impedances shall be used. Comparison of calculated and measured emission values with clause 5 limits to enable a declaration of pliance with IEC 6100033 If all values calculated according to , or measured in accordance with IEC 6100033, are less than or equal to the limits in clause 5, the manufacturer may declare that the product meets the technical requirements of IEC 6100033. Page 10 EN 61000?3?11:2020 169。 BSI 012020 Calculation of the maximum permissible system impedance The following evaluation procedure shall be applied if the equipment emissions cannot meet the technical requirements of IEC 6100033 and therefore the equipment cannot be declared pliant by the manufacturer in accordance with . In such a case the equipment shall only be connected to a supply having a system impedance lower than Zref. To calculate the lower system impedance, Zsys, the values of dc, dmax, Pst and P lt calculated according to shall be used in the following formulae. For manual switching: Zsys1 Z ref (The d max limit given in clause 5 appropriate to the EUT) d max Z sys 2 Z ref 3,3 % dc 3 Z sys 3 Z ref 1 2 Pst 3 Z Z 0,65 2 sys 4 ref Plt The minimum of the four calculated values of Zsys is the maximum permissible system impedance, Zmax which the manufacturer shall declare in accordance with clause 4. In consideration of voltage changes caused by manual switching, it is only required to calculate Zsys1 and Zsys2。 Zmax is the minimum of the two values. See annex A for further information. Provided that the conditions for dc and dmax are met with Ztest, d(t) shall be deemed to be satisfied. Evaluation and declaration by the manufacturer of the minimum permissible service current capacity For single phase equipment intended to be connected to public lowvoltage distribution systems having a nominal voltage of 230 V line to neutral by means of a single or threephase service having a service current supply capacity 100 A per phase, the test impedance, Ztest, shall be set in plex terms at 0,25 + j 0,25 。 see figure 1. For threephase equipment intended to be connected to public lowvoltage distribution systems having a nominal voltage of 400 V line to line by means of a threephase service having a service current capacity 100 A per phase, the test impedance, Ztest, shall be set in plex terms at 0,15 + j 0,15 for each line, and 0,1 + j 0,1 for the neutral。 see figure 1. Page 11 EN 61000?3?11:2020 169。 BSI 012020 Equipment tested against the test impedances specified in the previous paragraphs shall meet the limits given in clause 5. The manufacturer shall declare the minimum service current capacity in accordance with 4 b). Page 12 EN 61000?3?11:2020 169。 BSI 012020 Annex A (informative) Explanation of flicker exponents Explanation of For harmonics or flicker, the permitted perturbation of the system voltage is decreased as the system impedance is reduced, because the number of consumers influenced by the disturbances is increased and there is less diversity. However, coincidence of voltage change disturbances is very unlikely, since two changes having only 1 s time difference can be regarded as separate events. It is unlikely that, for example, two unbined motors will start exactly in the same second, and that the voltage drops will be cumulative. For this reason, the permitted voltage change is independent of the work impedance and, therefore, the voltage drop during operation at the system impedance may reach, but should not exceed, the limit values according to clause 5. W here the probability of two, or more, exactly simultaneous switching processes is quite small and a reduction of the permitted relative voltage drops is not necessary,