1、 IEC TS 60871-3 Edition 2.0 2015-06 TECHNICA L SPECIFICA TION Shunt capacitors for A C power sy stems having a rated voltage above 1 000 V Part 3:Protection of shunt capacitors and shunt capacitor banks IEC TS 60871-3:2015-06(en)Copyright International Electrotechnical Commission THIS PUBLICATION IS
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11、 60871-3 Edition 2.0 2015-06 TECHNICA L SPECIFICA TION Shunt capacitors for A C power sy stems having a rated voltage above 1 000 V Part 3:Protection of shunt capacitors and shunt capacitor bank s INTER NATIONA L ELECTROTECHNICA L COMMISSION ICS 29.240.99;31.060.70 ISBN 978-2-8322-2755-8 Registered
12、t rademark of t he Int ernational Electrot echnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.Copyright International Electrotechnical Commission 2 IEC TS 60871-3:2015 IEC 2015 CONTENTS FOREWORD.5 1 Scope.7 2 Normative ref erences.7 3 Terms and de
13、f initions.7 4 Internal f uses.7 4.1 General.7 4.2 Fuse characteristics.8 4.2.1 Rated current.8 4.2.2 Rated discharge capability.8 4.2.3 Disconnecting capability.8 4.2.4 Voltage withstand capability af ter operation.8 4.3 Inf luence of capacitor element conf iguration on capacitor lif e.8 4.3.1 Capa
14、citor with all elements connected in parallel.8 4.3.2 Capacitor with elements connected in series and parallel.8 5 External f uses.8 5.1 General.8 5.2 Fuse characteristics.9 5.2.1 Rated current.9 5.2.2 Rated voltage.9 5.2.3 Time-current characteristics.9 5.2.4 Discharge capability.10 5.3 Fuse types.
15、10 5.3.1 General.10 5.3.2 Expulsion f uses.10 5.3.3 Current-limiting f uses.11 5.3.4 Combination current-limiting/expulsion f uses.11 5.4 Inf luence of capacitor bank conf iguration on f use selection.11 5.4.1 Single series section grounded star and delta banks.11 5.4.2 Single series section ungroun
16、ded star banks.11 5.4.3 Multiple series section banks.11 5.5 Coordination with case rupture curves.11 6 Unbalance detection.12 6.1 Operation.12 6.2 Types of unbalance protection.12 6.2.1 Neutral current(Figure 3).12 6.2.2 Neutral voltage(Figure 4).12 6.2.3 Current unbalance between neutrals(Figure 5).13 6.2.4 Phase voltage unbalance(Figure 6).13 6.2.5 Voltage dif f erence(Figure 7).13 6.2.6 Current unbalance in bridge connection(Figure 8).13 6.3 Current and voltage transf ormers.13 6.3.1 Current
