油浸式变压器在线监测与保护装置

On-line detecting and protecting device for Oil-immersed power transformer

提出了一种新型油浸式变压器油箱内故障在线监测与保护装置.该装置以PIC18FXX系列单片机作为测量和控制核心,利用其自带的CCP功能模块和A/D转换功能模块及CAN总线模块,扩展了少量的外围电路,实现了对变压器油箱内绝缘油的高度和温度的在线监测与故障保护.测量结果通过CAN总线传送给上位机.本设计采用电容法间接测量油箱内的油面高度,采用温敏元件测量变压器绝缘油的温度,具有成本低、可靠性高、结构简单等特点,特别适用于普通的中、小型变压器中.

A novel oil-immersed power transformer on-line detecting and protecting equipment in oil-tank is presented. PIC18FXX single chip microcomputer is used as core of the equipment to realize control and signal acquisition. With the CCP function module, A/D converting function module, as well as CAN bus function module embedded in single chip microcomputer, only few extended peripheral circuit is needed. The design realizes the on-line detecting and fault protecting for height and temperature of insulated oil in transformer oil-tank. The measuring result can be sent to superior computer through CAN bus. A particular capacitance sensor is used to measure the oil-height in the oil-tank indirectly, and the temperature of insulated oil in transformer is gained by temperature sensitive parts. The device presented here possesses the characters such as lower cost, higher reliability, simpler circuit-structure, and is specially applicable to medium-pattern and small-pattern power transformers.