NORME CEI INTERNATIONALE IEC INTERNATIONAL 60044-5 STANDARD

4-5Première éditionFirst edition2004-04Transformateurs de mesure –Partie 5:Transformateurs condensateurs de tensionInstrument transformers –Part 5:Capacitor voltage transformers IEC 2004 Droits de reproduction réservés Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niutilisée sous quelque forme que ce soit et par aucun procédé,électronique ou mécanique, y compris la photocopie et lesmicrofilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized in anyform or by any means, electronic or mechanical, includingphotocopying and microfilm, without permission in writing fromthe publisher.International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: 41 22 919 02 11 Telefax: 41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.chCom mission Electrotechnique InternationaleInternational Electrotechnical Com m issionМеждународная Электротехническая КомиссияCODE PRIXPRICE CODEXBPour prix, voir catalogue en vigueurFor price, see current catalogue

60044-5 IEC:2004–3–CONTENTSFOREWORD. 111Scope . 152Normative references. 153Terms and definitions . 1743.1 General definitions. 173.2 Capacitor voltage divider definitions . 273.3 Electromagnetic unit definitions . 333.4 Carrier-frequency accessories definitions . 35General requirements . 355Service conditions. 3565.1 Normal service conditions . 355.2 Special service conditions. 395.3 System earthing. 41Ratings . 4176.1 Standard values of rated frequency . 416.2 Standard values of rated voltages . 416.3 Standard values of rated output . 436.4 Standard values of rated voltage factor . 436.5 Limits of temperature rise . 45Design requirements . 4787.1 Insulation requirements . 477.2 Other insulation requirements . 517.3 Short-circuit withstand capability . 577.4 Ferro-resonance . 577.5 Electromagnetic emission requirements . 597.6 Mechanical requirements . 617.7 Tightness of capacitor voltage divider and electromagnetic unit . 63Classification of tests . 6398.18.28.38.4TypeType tests . 63Routine tests . 69Special tests . 69Test sequence for one or two units . 69test . 699.1Temperature-rise test . 699.29.39.49.59.69.79.89.99.10Capacitance and tanδ measurement at power-frequency . 73Short-circuit withstand capability test . 75Impulse tests . 77Wet test for outdoor capacitor voltage transformer . 79Ferro-resonance tests. 81Tightness test of a liquid-filled electromagnetic unit. 83Accuracy tests . 83Transient response test . 87Radio interference voltage test. 91

60044-5 IEC:2004–5–10 Routine tests . 9110.1 Tightness of the liquid-filled capacitor voltage divider . 9110.2 Power-frequency withstand test and measurement of capacitance, tanδ andpartial discharge . 9110.3 Verification of terminal markings . 10110.4 Power-frequency withstand tests on the electromagnetic unit . 10110.5 Ferro-resonance check . 10310.6 Accuracy check . 10311 Special tests . 10711.1 Measurement of the transmission factor of high frequency overvoltages . 10711.2 Mechanical strength test . 10711.3 Determination of the temperature coefficient (T C ) . 10911.4 Tightness design test of capacitor units . 10912 Marking of the capacitor units . 10912.1 General . 10912.2 Marking . 10913 Terminal markings . 10913.1 General . 10913.2 Markings . 11114 Additional requirements for measuring capacitor voltage transformer . 11114.1 Accuracy class designation . 11114.2 Standard reference range of frequency . 11114.3 Standard accuracy classes . 11314.4 Limits of voltage error and phase displacement . 11314.5 Tests for accuracy . 11515 Additional requirements for protective capacitor voltage transformers . 11515.1 Accuracy class designation . 11515.2 Standard reference range of frequency . 11515.3 Standard accuracy classes . 11515.4 Limits of voltage error and phase displacement . 11515.5 Transient response . 11715.6 Requirements for secondary windings intended to produce a residual voltage. 11916 Rating plate . 12316.1 Markings of the rating plate. 12316.2 Example of a typical rating plate . 12917 Requirements for carrier – frequency accessories . 13117.117.217.317.417.5General . 131Drain coil and voltage limitation device. 131Type tests for carrier frequency accessories . 133Routine tests for carrier frequency accessories . 133Marking of the rating plate . 135

60044-5 IEC:2004–7–Annex A (normative) Typical diagram of a capacitor voltage transformer. 137Annex B (informative) Transient response of capacitor voltage transformer under faultconditions . 139Annex C (normative) High-frequency characteristics of capacitor voltage transformers . 141Bibliography . 143Figure 1 – Altitude correction factor for the insulation . 39Figure 2 – Altitude correction factor for the temperature rise . 45Figure 3 – Flow charts test sequence to be applied when performing the type test(Figure 3a) and routine test (Figure 3b) . 67Figure 4 – Diagram of a capacitor voltage transformer for the transient response testusing equivalent circuit method . 89Figure 5 – Series burden . 89Figure 6 – Pure resistance . 89Figure 7 – Test circuit . 97Figure 8 – Alternative circuit . 97Figure 9 – Example of balanced test circuit . 99Figure 10 – Example of calibration circuit . 99Figure 11 – Example of an error diagram of class 1 CVT for accuracy check with theequivalent circuit . 105Figure 12 – Single-phase transformer with a neutral primary terminal and a singlesecondary . 111Figure 13 – Single-phase transformer with a neutral primary terminal and with twosecondaries . 111Figure 14 – Single-phase transformer with a neutral primary terminal and with twotapped secondaries . 111Figure 15 – Single-phase

International Electrotechnical Commission, 3, rue de VarembØ, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: 41 22 919 02 11 Telefax: 41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch