BS 5049-2:1994

Committees responsible
National foreword
Methods
Scope and object
1 Measurements
1.1 Measuring instruments
1.2 C.I.S.P.R. site measurements - 0.15 MHz to 30 MHz
     range
1.3 C.I.S.P.R. laboratory measurements
1.4 Statistical evaluation of the radio noise level of
     a line
2 Methods for derivation of limits
2.1 Introduction
2.2 Significance of C.I.S.P.R. limits for power lines
     and high-voltage equipment
2.3 Technical considerations for derivation of limits
     for lines
2.4 Methods of determining compliance with limits
2.5 Examples for derivation of limits
2.6 Additional remarks
2.7 Technical considerations for derivation of limits
     for line equipment and substations
3 Methods for derivation of limits for the radio
     noise due to HVDC lines
3.1 Significance of C.I.S.P.R. limits for power lines
     and high-voltage equipment
3.2 Technical considerations for derivation of limits
     for lines
3.3 Methods of determining compliance with limits
3.4 Examples for derivation of limits
3.5 Additional remarks
4 Procedures for determining limits of radio noise
     produced by insulator sets
4.1 General considerations
4.2 Insulator types
4.3 Influence of insulator surface conditions
4.4 Criteria for setting up radio noise limits for
     insulators
4.5 Recommendations
Bibliography and references
Appendices
A Radio interference measuring apparatus differing
     from the C.I.S.P.R. basic standard instruments
B List of additional information to be included in
     the report on the results of measurements on
     operational limits
C Minimum broadcast signal levels to be protected -
     ITU Recommendations
D Minimum broadcast signals to be protected - North
     American standards
E Required signal-to-noise ratios for satisfactory
     reception
F Derivation of formula for protected distance
Tables
1 Recommendations for the radio noise voltage limits
     and for the test methods for insulator sets
     installed in different areas
CI Minimum field strength
CII Nominal usable field strength
DI Signal levels at the edge of the service area in
     North America
EI Summary of signal-to-noise ratios for corona from
     a.c. lines
EII Untitled
Figures
1 Transformation of pulses through a C.I.S.P.R.
     measuring set
2 Bursts of corona pulses generated by alternating
     voltage
3 Example of extrapolation to determine the radio
     noise field reference level of a power line
4 Basic test circuit
5 Standard test circuit
6 Measuring set connections co-axial cable
7 Measuring set connections balanced cable
8 Special test circuit
9 Arrangement for calibration of standard test
     circuit
10 Map showing boundaries of Zones A, B and C in
     Regions 1 and 3
11 Illustration of the four basic parameters
12 Example of typical statistical yearly 'all-weather'
     distributions of the radio-noise levels for a
     bipolar direct current line (long dashes) and for
     an alternating current line (short dashes)
13 Example of radio noise voltage level V, as a
     function of the relative air humidity R.H. in clean
     conditions and slightly polluted conditions, of a
     standard insulator, (long dashes) and a particular
     type of 'low noise' insulator (short dashes)

Techniques and procedures for use when measuring fields on site near an overhead line and for making laboratory measurements of interference voltages and currents generated by line equipment and accessories.