IEC 60353 : 2.0

LINE TRAPS FOR A.C. POWER SYSTEMS

International Electrotechnical Committee

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FOREWORD PREFACE SECTION ONE - GENERAL Clause 1 Scope 2 Object 3 Symbols used in this standard 4 Service conditions    4.1 Standard conditions    4.2 Altitude    4.3 Ambient temperature    4.4 Power frequency    4.5 Wave shape    4.6 Unusual service conditions SECTION TWO - DEFINITIONS 5 General    5.1 Main coil    5.2 Tuning device    5.3 Protective device    5.4 Carrier-frequency characteristics    5.5 Currents SECTION THREE - REQUIREMENTS 6 General requirements    6.1 Main coil    6.2 Tuning device    6.3 Protective device 7 Blocking requirements 8 Continuous service requirements 9 Ability to withstand rated short-time current    9.1 Mechanical strength    9.2 Thermal behaviour 10 Insulation level    10.1 insulation across a line trap    10.2 System voltage insulation    10.3 Line traps for use at high altitudes 11 Radio influence voltage (RIV) 12 Power losses 13 Tensile strength of suspension system 14 Accessories    14.1 Bird barriers    14.2 Terminals SECTION FOUR - RATING PLATES 15 Rating plate of the main coil 16 Rating plate of tuning device 17 Rating plate information for protective device SECTION FIVE - TESTS 18 General conditions 19 Tests    19.1 Temperature rise test (type test)    19.2 Measurement of radio influence voltage (type tests)    19.3 Insulation tests    19.4 Short-time current tests (type tests)    19.5 Measurement of the rated inductance of the main coil         (type and routine test)    19.6 Measurement of power frequency inductance of the         main coil (type and routine test)    19.7 Measurement of blocking resistance and blocking         impedance (type and routine test)    19.8 Measurement of tapping loss and tapping loss based on         the blocking resistance (type and routine test) SECTION SIX - RECOMMENDED VALUES 20 Rated inductance of main coil (mH) 21 Rated continuous current (A) 22 Rated short-time current (kA r.m.s.) 23 Co-ordination of rated continuous current and rated    short-time current APPENDIX A APPENDIX B - Line traps associated with a.c./d.c converter stations Figures

Abstract

Applies to line traps inserted into high-voltage a.c. transmission lines that prevent undue loss of carrier signal power in the range 30 kHz to 500 kHz under all power system conditions, and that minimize interference from carrier signalling systems on adjacent transmission lines.