Abstract: Transformer is a key equipment in the power supply and distribution system of offshore oil and gas production facilities. Power outage and shutdown of facilities caused by transformer failure occur from time to time,which is mainly caused by inadequate transformer maintenance. The transformer maintenance work of offshore production facilities lacks systematic and comprehensive maintenance standards,resulting in uneven maintenance construction quality and frequent transformer failures. In order to change this situation,this paper puts forward the work scope and technical requirements for the annual maintenance of transformers used in marine environment,and regulates the maintenance items and maintenance depth. The transformer online monitoring system and transformer upstream and downstream switchgear are included in the scope of transformer maintenance,and the corresponding maintenance technical requirements are formulated to improve the integrity,standardization and overall quality of transformer maintenance work. To address the common problems in the current transformer maintenance process,the solution is proposed.

Key words: transformer, annual maintenance, maintenance strategy, electrical test, quality control