Research on deep exploiting technology of power transformer load capacity

Abstract

Exploiting the load capacity of operating transformers is an important measure to ensure the safe operation of the power grid under emergency load conditions. Based on the typical methods for top oil temperature measurement and hot-spot temperature measurement， this paper proposes an optimal measurement of R×K2 and gr for special transformers to exert the original load capacity of the transformer still further. Meanwhile， to improve the cooling capacity of transformers， a series of solutions including installing extra fans， replacing low-speed fans， and frequency conversion of power supply for fans. Thus， the load capacity of the operating transformers is improved. The paper analyzes the transformers’ safety risks during the high-load operating condition， and proposes a new safety management method based on the online monitoring of oil levels and combustible gas， providing technical support for ensuring the high-load operation safety of transformers.

Keywords

• transformer
• load capacity
• evaluation
• frequency conversion
• fan
• combustible gas
• oil level