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Info iec61869 2 ed1 0 b This is a preview - click here to buy the full publication INTERNATIONAL STANDARD NORME INTERNATIONALE IEC - Edition - Instrument transformers ?? Part Additional requirements for current transformers Transformateurs de mesure ?? Pa

This is a preview - click here to buy the full publication INTERNATIONAL STANDARD NORME INTERNATIONALE IEC - Edition - Instrument transformers ?? Part Additional requirements for current transformers Transformateurs de mesure ?? Partie Exigences supplémentaires concernant les transformateurs de courant INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS XB PRICE CODE CODE PRIX ISBN - - - - Warning Make sure that you obtained this publication from an authorized distributor Attention Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé Registered trademark of the International Electrotechnical Commission Marque déposée de la Commission Electrotechnique Internationale CThis is a preview - click here to buy the full publication IEC - ISH ? IEC ?? ?? INTERNATIONAL ELECTROTECHNICAL COMMISSION IEC - Edition - INSTRUMENT TRANSFORMERS ?? Part Additional requirements for current transformers INTERPRETATION SHEET This interpretation sheet has been prepared by IEC Technical Committee Instrument transformers The text of this interpretation sheet is based on the following documents DISH DISH Report on voting RVDISH Full information on the voting for the approval of this interpretation sheet can be found in the report on voting indicated in the above table Limits of ratio error and phase displacement for measuring current transformers BACKGROUND Subclause states the following For all classes the burden shall have a power-factor of lagging except that when the burden is less than VA a power-factor of shall be used with a minimum value of VA QUESTION How shall this sentence be interpreted when the rated output is above VA but the test burden for the test at of the rated output is below VA For example when testing a current transformer with a rated output of VA the test burden at of the rated output is VA Shall this test burden be at power factor or ICS IEC - - ISH - en CThis is a preview - click here to buy the full publication INTERPRETATION ?? ?? IEC - ISH ? IEC The burden mentioned in the above-stated sentence of is to be understood as the test burden and therefore in the proposed example the test at VA has to be carried out at power factor Rationale The sentence under discussion is about the burden connected to the current transformer during the accuracy test This is the understanding of manufacturers metrological institutes and test laboratories This is also re ected in the commercially available test burdens used for accuracy testing of current transformers These burdens have the possibility to choose values of VA and above with a power factor of and values below VA with a power factor of The minimum test burden is VA For the above-mentioned reasons it is logical to conclude that ? the power factor value is for test burdens of VA and above ? the power factor value is for test burdens of less than VA ? VA is the minimum value for the rated output as well as for the test burden Some users need to compare accuracy measurements at