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DL/T 691-2019: Calculation method of radio interference from high voltage overhead power transmission lines
Status: Valid DL/T 691: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| DL/T 691-2019 | English | 279 |
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Calculation method of radio interference from high voltage overhead power transmission lines
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DL/T 691-2019
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| DL/T 691-1999 | English | 439 |
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Methods of calculation of radio interference from high voltage overhead power transmission lines
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DL/T 691-1999
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PDF similar to DL/T 691-2019
Basic data | Standard ID | DL/T 691-2019 (DL/T691-2019) | | Description (Translated English) | Calculation method of radio interference from high voltage overhead power transmission lines | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F20 | | Classification of International Standard | 29.240 | | Word Count Estimation | 12,147 | | Date of Issue | 2019 | | Date of Implementation | 2019-10-01 | | Issuing agency(ies) | National Energy Administration | DL/T 691-2019: Calculation method of radio interference from high voltage overhead power transmission lines
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Calculation method of radio interference from high voltage overhead power transmission lines
ICS 29.020
F 20
People's Republic of China Electric Power Industry Standard
Replace DL/T 691-1999
Radio Interference Calculation Method for High Voltage Overhead Transmission Line
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 4 Calculation of radio interference from AC transmission lines split and below...1
5 Calculation of radio interference caused by multi-split AC transmission lines...3
6 Radio Interference Calculation of DC Line...5
7 Calculation of radio interference spectrum characteristics...5
Appendix A (informative appendix) Calculation method of conductor surface potential gradient...6
Appendix B (informative appendix) CISPR recommended excitation function calculation method...8
Appendix C (informative appendix) Detailed calculation process of modular transformation method...9
References...11
Foreword
This standard is revised on the basis of DL/T 691-1999 "Calculation Method for Radio Interference of High Voltage Overhead Transmission Lines". This revision
The relevant contents of DL/T 691-1999 are included in this standard.
The main changes of this standard compared with DL/T 691-1999 are as follows.
--The range of radio interference calculation is extended to 1000kV;
--Extend the calculation formula of radio interference empirical method for double-circuit transmission lines on the same tower to the radio interference experience of multi-circuit transmission lines on the same tower
Method calculation formula
- Explain and refine the calculation steps of using excitation function method to calculate radio interference;
--Proposed the radio interference excitation function based on the UHV corona cage test in my country;
-The "same pole" in the original standard is changed to "same tower";
- The "power transmission" in the original standard has been changed to "power transmission".
This standard replaces DL/T 691-1999 from the date of implementation.
Appendix A and Appendix B of this standard are informative appendices.
This standard was proposed by the Standardization Management Center of the China Electricity Council.
This standard is under the jurisdiction and interpretation of the National Electromagnetic Compatibility Standardization Technical Committee (SAC/TC 246).
The organization responsible for drafting this standard. China Electric Power Research Institute Co., Ltd., North China Electric Power University, State Grid Co., Ltd., Power Planning
Design Institute, State Grid Electric Power Research Institute Wuhan Nanrui Co., Ltd., State Grid Shandong Electric Power Company Electric Power Research Institute.
The main drafters of this standard. Wan Baoquan, He Wangling, Wu Xiong, Lu Yao, Chen Yuchao, Tang Jian, Zhang Jiangong, Pei Chunming, Liu Yunpeng, Xie Hui
Chun, Zhang Yemao, Liu Zhenhuan, Wan Hao, Liu Huagang, Chen Yulong, Wu Guanbin.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of the China Electricity Council (Baiguang Road, Beijing
No. 100761).
Radio Interference Calculation Method for High Voltage Overhead Transmission Line
1 Scope
This standard recommends calculation methods for radio interference from high-voltage overhead transmission lines.
This standard is applicable to the calculation of radio interference of overhead transmission lines with voltage levels of 110kV~1000kV in normal operation.
The radio interference of transmission lines above 500m above sea level should be considered for correction.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 4365-2003 Electrotechnical terminology electromagnetic compatibility (IEC 60050-161.1990, IDT)
GB/T 15707-2017 Radio interference limits for high-voltage AC overhead transmission lines
3 Terms and definitions
The terms and definitions defined in GB/T 4365-2003 and GB/T 15707-2017 apply to this document.
4 4 Calculation of radio interference from AC transmission lines split and below
4.1 Calculation formula of radio interference field strength of single-phase conductor
4.2 Calculation formula for radio interference field strength of single circuit transmission line
Where.
Ei--the radio interference field strength at the direct distance Di from the i-th phase conductor, in dB (μV/m);
gmaxi--the maximum effective value of the potential gradient on the surface of the i-th phase conductor, in kV/cm;
Di--the direct distance from the i-th phase conductor to the reference point P (2m above the ground) (see Figure 1), in m;
ri--The radius of the sub-conductor of the ith phase conductor, in cm;
xi--The projection distance from point P to the i-th phase conductor, in m;
hi--the minimum height of the wire to the ground, in m.
The radio interference field strength of the three-phase line is calculated according to the following calculation method. if the field strength of one phase is at least 3dB greater than the other two phases, then
The latter can be ignored. The radio interference field strength of the three-phase line can be considered equal to the maximum one-phase field strength, otherwise the following formula.
4.3 Calculation formula for radio interference of multi-circuit transmission lines on the same tower
For multi-circuit transmission lines on the same tower, the radio interference generated by each phase conductor in the multiphase conductor can be calculated according to formula (2), and
The field strengths generated by the phases of the same name are geometrically added.
5 Calculation of radio interference caused by multi-split AC transmission lines
5.1 Overview
Based on the excitation function under heavy rain measured by the test line or corona cage, through a certain mode conversion, the radio of each phase wire is obtained
Interference current, and then obtain the field generated by these currents, that is, radio interference. The calculation steps include. calculation of excitation function and modification of meteorological influence
Positive; Calculate the distribution of radio interference field strength through mode conversion.
5.2 Calculation of excitation function
5.4 Calculation of radio interference field strength
There is a magnetic field H around the current-carrying conductor. There is a certain relationship between the high-frequency electric field and the magnetic field. The relationship between the magnetic field strength and the current is (see Figure 2).
6 Calculation of radio interference of DC line
7 Calculation of radio interference spectrum characteristics
Appendix C
(Informative appendix)
Detailed calculation process of mode conversion method
Calculate wire current distribution and radio interference using the method of analog conversion.
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