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PD CISPR/TR 18-2:2010 Radio interference characteristics of overhead power lines and high-voltage equipment - Methods of measurement and procedure for determining limits, 2010
- cispr18-2{ed2.0}en.pdf [Go to Page]
- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Measurements [Go to Page]
- 4.1 Measuring instruments
- 4.2 On-site measurements on HV overhead power lines
- 4.3 Statistical evaluation of the radio noise level of a line
- 4.4 Additional information to be given in the report
- 4.5 Measurements on HV equipment in the laboratory
- 5 Methods for derivation of limits for HV power systems [Go to Page]
- 5.1 Overview
- 5.2 Significance of CISPR limits for power lines
- 5.3 Technical considerations for derivation of limits for lines
- 5.4 Methods of determining compliance of measured data with limits
- 5.5 Examples for derivation of limits in the frequency range below 30 MHz
- 5.6 Additional remarks
- 5.7 Technical considerations for derivation of limits for line equipment and HVAC substations
- 6 Methods for derivation of limits for the radio noise produced by insulator sets [Go to Page]
- 6.1 General considerations
- 6.2 Insulator types
- 6.3 Influence of insulator surface conditions
- 6.4 Criteria for setting up radio noise limits for insulators
- 6.5 Recommendations
- 7 Methods for derivation of limits for the radio noise due to HVDC converter stations and similar installations [Go to Page]
- 7.1 General considerations
- 7.2 Sources of interference
- 7.3 Radiated fields from valve halls
- 7.4 Conducted interference along the transmission lines
- 7.5 General criteria for stating limits
- 8 Figures
- Annex A (informative) Radio interference measuring apparatus differing from the CISPR basic standard instruments
- Annex B (normative) List of additional information to be included in the report on the results of measurements on operational lines
- Annex C (informative) Minimum broadcast signal levels to be protected – ITU recommendations
- Annex D (informative) Minimum broadcast signals to be protected – North American standards
- Annex E (informative) Required signal-to-noise ratios for satisfactory reception
- Annex F (informative) Derivation of the formula for the protected distance
- Bibliography
- Figures [Go to Page]
- Figure 1 – Transformation of pulses through a CISPR measuring receiver
- Figure 2 – Bursts of corona pulses generated by alternating voltage
- Figure 3 – Example of extrapolation to determine the radio noise field strength reference level of a power line, here at the direct reference distance of 20 m
- Figure 4 – Basic test circuit
- Figure 5 – Standard test circuit
- Figure 6 – Connection to the measuring receiver by a coaxial cable
- Figure 7 – Connection to the measuring receiver by a balanced cable
- Figure 8 – Special test circuit
- Figure 9 – Arrangement for calibration of the standard test circuit
- Figure 10 – Map showing boundaries of zones A, B, and C in regions 1 and 3
- Figure 11 – Illustration of the four basic parameters for a power transmission line
- Figure 12 – Example of typical statistical yearly "all-weather" distributions of the radio-noise levels of a bipolar direct current line (-----) and for an alternating current line in a moderate climate (- - -)
- Figure 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 (-----) and a particular type of "low noise" insulator (- - -)
- Figure 14 – Example of frequency spectra of pulses with different rise times, simulating commutation phenomena in mercury valves and in thyristor valves
- Figure 15 – Example of frequency spectra of the radio interference recorded outside the hall of a mercury arc valve converter station with and without toroidal filters
- Figure 16 – Example of frequency spectra of the radio interference recorded outside the hall of a thyristor valve converter station for different operating conditions
- Figure 17 – Attenuation of the field strength as a function of the distance on a horizontal plane, for different frequencies
- Figure 18 – Example of frequency spectrum of the radio interference in the vicinity of a d.c. line (30 m) at a short distance from the converter station
- Figure 19 – Example of frequency spectrum of the radio interference in the vicinity of an a.c. line (20 m) at a short distance from the converter station
- Figure 20 – Frequency spectra of radio interference at 20 m from the electrode line at 1,5 km from the Gotland HVDC link in Sweden with mercury arc groups or thyristor groups in operation
- Figure 21 – Frequency spectra of radio interference at 20 m from the electrode line at 1,5 km and 4,5 km from the Gotland HVDC link in Sweden with mercury arc groups in operation
- Figure 22 – Frequency spectra of the radio interference recorded along a 200 kV d.c. line, at 20 m from the conductor, at different distances from the converter station
- Tables [Go to Page]
- Table 1 – Number of n sets of measurement of the radio noise level and corresponding values for factor k
- Table 2 – Minimum usable broadcast signal field strengths in the v.h.f bands according to CCIR
- Table 3 – Recommendations for the radio noise voltage limits and for the test methods for insulator sets installed in different areas
- Table C.1 – Minimum field strength
- Table C.2 – Nominal usable field strength
- Table D.1 – Signal levels at the edge of the service area in North America
- Table E.1 – Summary of signal-to-noise ratios for corona from a.c. lines (Signal measured with average detector, noise measured with quasi-peak detector)
- Table E.2 – Quality of radio reception or degree of annoyance due to RFI [Go to Page]