To meet the requirement of unattended wind farm

and improve the security

reliability and automationof pad-mounted transformer

the key issues of the design of pad-mounted transformer monitoring and protection arestudied. Considering the actual engineering application

the three pad-mounted transformer monitoring schemes aresummarized. Then

the influence of transformer oil temperature and other factors on the selection of the fuse ratedcurrent is analyzed in detail. The protection cooperation setting program of low-voltage breaker protection and windbreaker protection is proposed. Based on the analysis of pad-mounted transformer lack-phase operation

theschemes of lack-phase protection are proposed. The configuration of the gas protection and other non-electricity pro-tection is elaborated. The protection measures to isolate the fault pad-mounted transformer completely are intro-duced. The design of pad-mounted transformer monitoring and protection is expected to provide reference for the ac-tual engineering projects.