本文介绍的煤电钻变压器载频短路保护,其电路特点是利用555时基集成电路中的电压比较器作为监测回路、利用该集成电路的逻辑功能来实现短路保护自锁,并利用它的高电平输出作为驱动端,直接带动中间继电器,实现短路保护。 This paper describes the coal-drill transformer short-circuit protection of the carrier frequency, the circuit is characterized by the use of 555 time-based integrated circuit voltage comparator as a monitoring circuit, the use of integrated circuits to achieve short-circuit logic to protect self-locking and use its high Level output as the drive side, directly drive the intermediate relay, short circuit protection.