To enhance the reliability of the unit saic Siemens turbine bearing temperature protection Suggestions

To enhance the reliability of the unit saic Siemens turbine bearing temperature protection advice - 2019 08 - 28 Ding Junhong/article zhejiang electricity science college in recent years, saic Siemens turbine unit bearing temperature signal abnormal situation several times. In August 2015, a factory unit # 2 / # 3 # 5 crew fault and bearing bushing temperature measuring point has two faults in the three components of measuring points. On July 7, 2016 a # 2 gas turbine # 5 bearing temperature components under the oil flow scour protection layer is to break through, # 5 bearing upper segment temperature three components in the two temperature components were thrust, cause temperature jump machine protection action. Post-mortem found thermocouple cable fixed derivation is not enough, easy to touch the ground bearing box edges, under the lubricating oil for a long time scouring caused cable caused by wear and tear. （ Please refer to the attachment for event situation. ） Some units in the province in 2018, bearing temperature jump condition of components in the operation of the installation, check is difficult to determine the fault position. Bearing temperature is an important signal of participation in turbine main protection, to prevent similar incidents from happening again, please each unit failure prevention measures: 1) Maintenance temperature element arranged in the inspection, by adding a fixed line card, avoid shaking cable. 2) There is possibility to touch the ground, considering the existing thermocouple cable extension cases. When it is necessary to replace armoured metal casing temperature element. 3) Improve the bearing temperature redundant point inconsistent alarm logic function and high bearing temperature protection, measurement signal is abnormal warning ahead of time, to prevent high bearing temperature protection misoperation. Attachment: ( Source: turbine supervision)