US 11,692,496 B2
Method and device for capturing trip sign of turbine due to high bearing temperature based on correlation
Zhengguo Xu, Hangzhou (CN); Yong Xiong, Hangzhou (CN); Zijun Que, Hangzhou (CN); Peng Cheng, Hangzhou (CN); and Jiming Chen, Hangzhou (CN)
Assigned to ZHEJIANG UNIVERSITY, Hangzhou (CN)
Filed by ZHEJIANG UNIVERSITY, Hangzhou (CN)
Filed on Jul. 4, 2021, as Appl. No. 17/367,413.
Claims priority of application No. 202110301867.0 (CN), filed on Mar. 22, 2021.
Prior Publication US 2022/0298982 A1, Sep. 22, 2022
Int. Cl. F01D 21/12 (2006.01); F01D 21/14 (2006.01); F02D 35/02 (2006.01); F01D 25/16 (2006.01)
CPC F02D 35/02 (2013.01) [F01D 21/12 (2013.01); F01D 21/14 (2013.01); F01D 25/16 (2013.01); F05D 2260/80 (2013.01); F05D 2260/81 (2013.01); F05D 2270/3032 (2013.01); F05D 2270/334 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for capturing a trip sign of a turbine due to a high bearing temperature based on correlation, comprising following steps:
S1, monitoring in real time a temperature of a target bearing in a turbine and generator set operating parameters correlated to the temperature of the target bearing, obtaining time-series change data of each of the generator set operating parameter, wherein the generator set operating parameters comprise a temperature of a paired bearing, X-direction vibration of the target bearing and Y-direction vibration of the paired bearing, capturing the temperature of the target bearing by a temperature sensor provided at the target bearing, capturing the temperature of the paired bearing by a temperature sensor provided at the paired bearing, capturing the X-direction vibration of the target bearing by a displacement sensor provided at the target bearing, and capturing the Y-direction vibration of the paired bearing by a displacement sensor provided at the paired bearing, wherein the paired bearing is configured to be matched with the target bearing and support one turbine cylinder together with the target bearing;
S2, calculating a first correlation coefficient between the temperature of the target bearing and the temperature of the paired bearing in a current time window according to the time-series change data obtained in S1, and judging whether the first correlation coefficient exceeds a first threshold range, wherein the first threshold range is a variation range of a correlation coefficient between the temperature of the target bearing and the temperature of the paired bearing in a normal operation state of the turbine without trip faults;
S3, performing a Box-Cox transformation for a X-direction vibration signal of the target bearing and a Y-direction vibration signal of the paired bearing in the current time window by a processor according to the time-series change data obtained in S1, then calculating a second correlation coefficient between the two vibration signals after the transformation, and judging whether the second correlation coefficient exceeds a second threshold range, wherein the second threshold range is a variation range of the correlation coefficient between the X-direction vibration signal of the target bearing after the Box-Cox transformation and the Y-direction vibration signal of the paired bearing after the Box-Cox transformation under the normal operation state without the trip faults; and
S4, determining that the turbine has the trip sign due to a high bearing temperature if when the processor monitors that the first correlation coefficient exceeds the first threshold range and the second correlation coefficient exceeds the second threshold range in the current time window; and performing warning by a warning device when the turbine has the trip sign due to the high bearing temperature.