BS 5049-1:1994

Committees responsible
National foreword
Guide
1 Scope
2 Object
3 Introduction
4 Radio noise from power lines
4.1 Physical aspects of radio noise
4.2 Main characteristics of the noise field resulting
     from conductor corona
5 Effects of corona from conductors
5.1 Physical aspects of corona from conductors
5.2 Methods of investigation of corona by cages and
     test lines
5.3 Methods of predetermination
5.4 Catalogue of standard profiles
6 Radio noise levels due to insulators, fittings and
     substation equipment (excluding bad contacts)
6.1 Physical aspects of radio noise sources
6.2 Correlation between radio noise voltage and the
     corresponding field for distributed and individual
     sources
6.3 Influence of ambient conditions
7 Sparking due to bad contacts
7.1 Physical aspects of the radio noise phenomenon
7.2 Examples of gap sources
8 Special d.c. effects
8.1 General
8.2 Effects of corona from conductors
8.3 Radio noise due to insulators, fittings and
     substation equipment
8.4 Valve firing effects
Bibliography and references
Appendices
A Calculation of the voltage gradient at the surface
     of a conductor of an overhead line
B Catalogue of profiles of radio noise field due to
     conductor corona for certain types of power line
C Summary of the catalogue of radio noise profiles
     according to the recommendation of the C.I.S.P.R.
Figures
1 Typical lateral attenuation curves for high voltage
     lines
2 Typical lateral attenuation curves for high voltage
     lines
3 Example of statistical yearly distributions of
     radio-noise levels recorded continuously under
     various overhead lines
4 Example of statistical yearly distributions of
     radio-noise levels recorded continuously under
     various overhead lines
5 Example of statistical yearly distributions of
     radio-noise levels recorded continuously under
     various overhead lines
6 Example of statistical yearly distributions of
     radio-noise levels recorded continuously under
     various overhead lines
7 Equipotential lines for clean and dry insulator
     unit
8 Determination of the magnetic field from and
     perpendicular to a section of a line, at a distance
     x from the point of injection of noise current I
9 Longitudinal noise attenuation versus distance from
     noise source (from the test results of various
     experiments frequencies around 0.5 MHz)
10 Lateral profile of the radio noise field produced
     by distributed discrete sources on a 420 kV line of
     infinite length
11 Example of relative strength of radio noise field
     as a function of frequency
12 Example of relative strength of radio noise field
     as a function of the distance from the line

Gives information on the factors involved in protecting the reception of radio and television broadcasting from interference due to high voltage overhead power lines and associated equipment.