IEC 61000-4-11:2020 pdf free download – Electromagnetic compatibility (EMC)
lf it is necessary to verify the peak inrush drive current capability， the generator shall beswitched from 0 % to 100 % of full output,when driving a load consisting of a suitable rectifierwith an uncharged capacitor whose value is 1 700 uF on the DC side.The test shall be carriedout at phase angles of both 90° and 270°. The circuit required to measure the generator inrushcurrent drive capability is given in Figure A.1.
When it is believed that a generator with less than the specified standard generator peak inrushcurrent-may can be used because the EUT-may can draw less than the specified standardgenerator peak inrush current(e.g.,500 A for 220 V to 240 V mains), this shall first be confirmedby measuring the EUT peak inrush current. When power is applied from the test generator, themeasured EUT peak inrush current shall be less than 70 % of the peak current drive capabilityof the generator, as already verified according to Annex A.The actual EUT inrush current shallbe measured both from a cold start and after a 5 s turn-off, using the procedure of Clause A.3.
Generator switching characteristics shall be measured with a 100 Q load of suitable power-dissipation rating.
9Evaluation of test results
The test results shall be classified in terms of the loss of function or degradation of performanceof the equipment under test, relative to a performance level defined by its manufacturer or therequestor of the test,or agreed between the manufacturer and the purchaser of the product.The recommended classification is as follows:
a) normal performance within limits specified by the manufacturer, requestor or purchaser;
b) temporary loss of function or degradation of performance which ceases after the disturbance ceases,and from which the equipment under test recovers its normal performance,withoutoperator intervention;
c) temporary loss of function or degradation of performance, the correction of which requires operator intervention;
d) loss of function or degradation of performance which is not recoverable, owing to damage to hardware or software, or loss of data.
The manufacturer’s specification may define effects on the EUT which-may can be consideredinsignificant, and therefore acceptable.
This classification may be used as a guide in formulating performance criteria, by committeesresponsible for generic，product and product-family standards,or as a framework for theagreement on performance criteria between the manufacturer and the purchaser, for examplewhere no suitable generic，product or product-family standard exists.
NOTEThe performance levels may can be different for voltage dip tests and short interruption tests as well as forvoltage variations tests, if this optional test has been required.
The circuit for measuring generator peak inrush current drive capability is shown inFigure A.1.Use of the bridge rectifier makes it unnecessary to change rectifier polarity for testsat 270° versus 90°.The rectifier half-cycle mains current rating should be at least twice thegenerator’s inrush current drive capability to provide a suitable operating safety factor.
The 1 700 uF electrolytic capacitor shall have a tolerance of ±20 %. lt shall have a voltagerating preferably 15 % to 20 % in excess of the nominal peak voltage of the mains, for example400 V for 220 v to 240 V mains. lt shall also be able to accommodate peak inrush current up toat least twice the generator’s inrush current drive capability, to provide an adequate operatingsafety factor.The capacitor shall have the lowest possible equivalent series resistance (ESR)at both 100 Hz and 20 kHz,not exceeding 0,1 Q at either frequency.