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Iec 60099 4 Latest Version Download


IEC 60099-4:2014 applies to non-linear metal-oxide resistor type surge arresters without spark gaps designed to limit voltage surges on a.c. power circuits with Us above 1 kV. This third edition cancels and replaces the second edition published in 2009. This edition constitutes a technical revision. The numerous changes between the second and third editions are listed in the Foreward of the document. Keywords: testing of gapless metal-oxide surge arresters for a.c.power systems




iec 60099 4 latest version download


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Abstract: IEC time parameter definitions for impulse currents are explained and an overview of the IEC standards 60060-1, 60099-4, 61643-1 and 61312-1 in regards to impulse current testing is given. The different impulse currents such as exponential current impulses (ECI), lightning current impulses (LCI) and rectangular current impulses (RCI) are analytically described by their simplified circuit diagrams. The generation of the lightning current impulses (LCI) is more detailed explained and the impulse current system of the Shanghai Metrology Institute delivered by the Haefely AG is introduced especially in regards of lightning current impulse testing. 1. Introduction The IEC standards 60060-1, 60099-4, 61643-1 and 61312-1 specify parameter tolerances for the different exponential current impulses (ECI), rectangular current impulses (RCI) and lightning current impulses. IEC 61312-1 standard gives a guideline how a lightning current impulse (LCI) for test purposes can be achieved. 2. Time parameter definitions for impulse currents according to IEC standards 2.1. Exponential current impulse (ECI) Figure 1. Time parameter ECI T1: Front time T2: Time to half value O1: Virtual origin Lightning Protection Forum Shanghai June 2004 Impulse current testing Michael Gamlin Haefely Test AG, Basle, Switzerland 1/7 2.2. Rectangular current impulse (RCI) Figure 2. Time parameter RCI Td: Duration of peak of a rectangular impulse Tt: Total duration of a rectangular impulse current 2.3. Current rise Figure 3. Parameter current rise Δi: I90% - I10% Δt: t90% - t10% 3. Overview of impulse current definitions according to IEC standards 3.1. IEC 60060-1: High Voltage Test Techniques; Part 1: General definitions and test requirements IEC 60060-1 defines several exponential current impulses as well as several rectangular current impulses by time parameters, peak values, polarity reversal and the permitted tolerances (see Figure 4.).


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