IEC 60353:1989

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

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.