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