US 11,885,848 B2
Method for assessing remaining life of rotating electrical machine and device for assessing remaining life of rotating electrical machine
Tadao Otani, Osaka (JP); Kazuo Hayashi, Tokyo (JP); Hiroshige Fujita, Tokyo (JP); Wataru Nagaya, Tokyo (JP); and Shinsuke Miki, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/284,789
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 15, 2019, PCT No. PCT/JP2019/044882
§ 371(c)(1), (2) Date Apr. 13, 2021,
PCT Pub. No. WO2020/105557, PCT Pub. Date May 28, 2020.
Claims priority of application No. 2018-217170 (JP), filed on Nov. 20, 2018.
Prior Publication US 2021/0405117 A1, Dec. 30, 2021
Int. Cl. G01R 31/34 (2020.01)
CPC G01R 31/34 (2013.01) 3 Claims
OG exemplary drawing
 
1. A method of maintaining a rotating electrical machine that, includes an insulator, the method comprising:
assessing a remaining life of the rotating electrical machine, the assessing including
acquiring, as actual running performance data about the rotating electrical machine, a running time of, and the number of times of activation/shutdown of, the rotating electrical machine, and acquiring, as electrical data about the rotating electrical machine, a dielectric tangent, a rapid current increase voltage value, a current increase rate, and a maximum discharge charge amount,
storing, in advance, in a memory, an association relationship between the maximum discharge charge amount and a residual withstand voltage value as a first table, and an association relationship between the rapid current increase voltage value and the residual withstand voltage value as a second table,
calculating, as a first index value, an estimation value of the residual withstand voltage value of the rotating electrical machine based on the actual running performance data,
calculating, as a second index value, an estimation value of the residual withstand voltage value of the rotating electrical machine, with use of the first table, from the maximum discharge charge amount,
calculating, as a third index value, an estimation value of the residual withstand voltage value of the rotating electrical machine, with use of the second table, from the rapid current increase voltage value,
calculating, as a fourth index value, an estimation value of the residual withstand voltage value of the rotating electrical machine by performing analysis that uses a Mahalanobis-Taguchi (MT) method on each piece of the electrical data, and
assessing the remaining life of the rotating electrical machine by estimating the remaining life of the rotating electrical machine based on results of a comparison of four index values from the first index value to the fourth index value with a value indicating an anti-surge voltage protection limit and a value indicating a safe running limit;
generating an efficient maintenance plan and schedule for the rotating electrical machine based on the assessed remaining life of the rotating electrical machine; and
performing maintenance on the rotating electrical machine according to the generated efficient maintenance plan and schedule for the rotating electrical machine.