HJ 24-2020 in English
ABOLISHEDTechnical guidelines for environmental impact assessment of electric power transmission and distribution
- Issued on:2020-12-14
- Implemented on:2021-03-01
- File Format:PDF
- Delivery:Via email within 5 business days
$534.00
本标准规定了输变电建设项目环境影响评价工作的内容和方法。
本标准适用于 110kV 及以上电压等级的交流输变电建设项目、±100kV 及以上电压等级的直流输电建设项目环境影响评价工作。
Introduction
Background of Standard Revision and Technological Evolution
As the second revision of the 2014 version of the guidelines, HJ 24-2020 has the following major adjustments:
- The word "engineering" is deleted from the standard name to highlight the technical attributes
- Evaluation requirements for new equipment such as Gas Insulated Metal Enclosed Transmission Lines (GIL) are added
- Surface water environmental impact assessment is strengthened, and special requirements for public participation are deleted
Analysis of core content
1. Delineation of evaluation scope
| Elements | Evaluation scope of substation | Evaluation scope of overhead lines |
|---|---|---|
| Electromagnetic environment | 30-50m outside the station boundary | 30-50m outside the projection of the side conductor |
| Ecological environment | 500m from the station boundary | 1000m in the sensitive area/300m in the non-sensitive area |
2. Electromagnetic environment hierarchical evaluation
Three-level evaluation is implemented according to the voltage level and sensitive target distribution:
- First-level evaluation: 500kV and above outdoor stations or lines in sensitive areas, full-factor actual measurement + prediction is required
- Third-level evaluation: 110kV indoor stations/underground cables, simplified analysis can be performed
Key technical requirements
1. Electromagnetic prediction method
Taking the mirror image method recommended in Appendix C as an example, the following should be considered when calculating the power frequency electric field of the AC line:
- Calculation of equivalent radius of split conductor (Formula C5)
- Construction of potential coefficient matrix (Formula C2-C4)
- Complex voltage decomposition (Formula C8-C9)
Implementation suggestions
1. Principle of avoiding sensitive targets
- Maintain a clear distance of more than 20m between 500kV lines and residential areas
- No new schools or hospitals should be built within 50m outside the converter station wall
2. Configuration of environmental protection facilities
Key points to be set up: accident oil pool (volume ≥ maximum oil volume of a single device), SF6 gas recovery device, underground cable anti-eddy current measures, etc.
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