主变压器备用相热备用快速投入研究

Research on Fast Start for Hot Standby Phase of Main Transformer

针对主变压器备用相热备用快速投入,提出一种设备布置连接方案,通过ETAP建模,进行不平衡潮流分析,分析热备用相变压器分别连接在高压侧和低压侧以及光伏电场在低负荷和高负荷发电4种情况下的系统电压不平衡度,确定在各种运行工况下系统三相电压满足国家标准GB/T 15543-2008《电能质量三相电压不平衡》的要求。通过该方案可以使变压器备用相在很短的时间内快速替换故障相,从而为设置备用相的企业降低了变压器故障带来的损失。

Aiming at the fast start for hot standby phase of the main transformer, a fast input scheme is proposed. Through ETAP modeling, unbalanced power flow analysis is carried out, and the system voltage unbalance of thermal backup phase transformer connected to high voltage side and low voltage side respectively and photovoltaic field under low load and high load power generation is analyzed. It is determined that the system three-phase voltage meets the requirements of the national standard GB/T 15543-2008 Power Quality—Three-phase Voltage Unba-lance. Through this scheme, the standby phase of the transformer can quickly replace the fault phase in a very short time, thus reducing the losses caused by transformer faults for enterprises setting up the backup phase.