Strength of magnetic leakage field of transformer increases with increasing of capacity transformer, greater the leakage magnetic field strength increases,the leakage loss caused by the transformer in the structure, resulting in low operating efficiency of the transformer,there by affecting the normal operation of 35 kV transformer are tested,magnetic flux leakage generating produced at the top end of the temperatures are compared with the maximum temperature and the fuel tank . The results show that when the fan on the premises and the fuel tank at the top of the highest temperature difference is 8. 7℃;when the load is reduced to 1 times the power,temperature difference is 2. 9℃,their real-time temperature curve is coincidence with operation of transformer,results in phenomenon of local temperature rise. Situation of magnetic leakage reflected by temperature changes detected by fiber Bragg grating( FBG),real time on-line monitoring on magnetic leakage of transformer is realized.%变压器的漏磁场强度随着变压器容量的增大而增大，漏磁场强度越大在变压器各结构中引起的漏磁损耗越大，导致变压器运行效率低下，进而影响变压器的正常运行。对35 kV变压器进行试验，将漏磁产生最大处的温度与油箱产生顶端处的温度进行了对比，试验得出当开风机时该处与油箱顶端处的最高温度差为8.7℃、当负荷降至1倍功率时温差为2.9℃，它们的实时温度曲线图与变压器的运行一致，产生了局部温升的现象。通过光纤Bragg光栅（ FBG）检测温度的变化反映变压器漏磁的情况，从而实现了对变压器漏磁的实时在线监测。
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