Abstract:At present, transformer air cooling control system usually adopted programmable logic controller(PLC)or digital signal processor(DSP).With the development of STM32 series chips, and at low prices become the important elements in the field of automatic control. Referred existing transformer air cooling control system, the control system based on STM32 chips was designed. Features such as pulsewidth modulation(PWM)soft start, differential margin start/stop, fans grouped start/stop and load and temperature start/stop and failure protection were added. Transformer air cooling control system was improved.Air cooling system reliability and durability was increased.

Keywords:air cooling system, differential margin, failure protection, soft start