GB/T 50417-2017 in English
VALIDCode for design of electric power supply of under the coal mine
- Issued on:2017-05-04
- Implemented on:2018-01-01
- File Format:PDF
- Delivery:Via email within 5 business days
$796.00
Introduction
1. Background and significance of standard formulation
The revision and release of GB/T 50417-2017, the design specification for underground power supply and distribution in coal mines, fully considers the latest developments in technology, equipment and management in the coal industry in recent years. This standard takes the guarantee of mine power supply safety as the core, combines the requirements of modern mine construction with intelligence, efficiency and greenness, and comprehensively upgrades the original specification.
2. Comparative analysis of standard frameworks
| Chapter number | Chapter content | Number of clauses in the 2007 version | Additions/adjustments in the 2017 version |
|---|---|---|---|
| 1 | General provisions | 3 clauses | New requirements for power supply in intelligent mines |
| 2 | Terms and symbols | 18 clauses | Supplemented terminology for new electrical equipment |
| 3 | Underground power supply and distribution system and voltage level | 9 clauses | Adjust the scope of high-voltage power supply and add requirements for disaster-resistant drainage systems |
3. Interpretation of key technical points
3.1 Design of high-voltage power supply system
According to Section 8.1 of the specification, underground high-voltage power supply systems must use mining flameproof electrical equipment and strictly follow the following requirements:
- Circuit breakers should be used for high-voltage incoming lines and busbar section switches.
- Oil-containing electrical equipment is prohibited.
- The substation must be located close to the auxiliary shaft to ensure a 30-minute emergency response time.
4. Implementation suggestions and precautions
- System security:Set up the main grounding grid and local grounding electrodes in strict accordance with the specifications to ensure the protective grounding of all electrical equipment underground.
- Cable laying:When laying high-voltage cables in a fixed manner, armored cables must be used, and the appropriate type (such as coal wire armor or steel belt lock) must be selected according to the inclination of the shaft.
- Substation management:Substation chambers that implement centralized ground monitoring do not need to have dedicated personnel on duty, but must be equipped with a video surveillance and inspection system.
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