塔式太阳能热发电项目中定日镜场的低压供电接地系统的分析

ANALYSIS OF LOW-VOLTAGE POWER SUPPLY GROUNDING SYSTEM OF HELIOSTATS FIELD OF TOWER SOLAR THERMAL POWER GENERATION PROJECT

根据接地形式的不同,低压供电接地系统可以分为TN低压供电接地系统(其中包括TN-S低压供电接地系统)、TT低压供电接地系统和IT低压供电接地系统。低压供电接地系统与发电项目的安全性直接相关,在实际发电项目中,不同的场合选用的低压供电接地系统各不相同。本文从安全性、可靠性和经济性的角度出发,对比分析了TT低压供电接地系统和TN-S低压供电接地系统在某塔式太阳能热发电项目的定日镜场低压供电接地系统中的应用特点。分析后发现:由于塔式太阳能热发电项目的定日镜场的供电距离较长,这种场合下TT低压供电接地系统具有更大的应用优势。

According to different grounding forms,the low-voltage power supply grounding system can be divided into TN low-voltage power supply grounding system(including TN-S low-voltage power supply grounding system),TT low-voltage power supply grounding system,and IT low-voltage power supply grounding system. The low-voltage power supply grounding system is directly related to the safety of the power generation project. In the actual power generation project,the low-voltage power supply grounding systems selected for different occasions are different. From the perspective of safety,reliability and economy,this paper compares and analyzes the application characteristics of the TT low-voltage power supply grounding system and the TN-S low-voltage power supply grounding system in the heliostats field of a tower solar thermal power generation project. The results show that the TT low-voltage power supply grounding system has greater application advantages when the power supply distance is longer of tower solar thermal power generation project.