公开(公告)号：US20170160330A1

公开(公告)日：2017-06-08

申请号：US15347499

申请日：2016-11-09

Applicant: ROLLS-ROYCE plc

Inventor： Vaiyapuri VISWANATHAN ,  Sivakumar NADARAJAN ,  Amit K. GUPTA

IPC: G01R31/02 ,  H02P9/14

CPC classification number: G01R31/02 ,  G01R31/34 ,  H02P9/14 ,  H02P25/03 ,  H02P29/0241

Abstract: A rectifier diode failure detection apparatus for an electrical machine (10), the electrical machine (10) comprising an exciter armature winding (28a-c), a rotor main field winding (24) and first and second rectifiers (34a, 34b) arranged in parallel, each rectifier (34a, 34b) comprising at least first and second diodes (38a, 38b), each rectifier being configured to independently supply the rotor main field winding (24) with DC electrical current, the failure detection apparatus comprising:a controller (40) comprising at least two current sensors (42a, 42b), each current sensor (42a, 42b) being configured to measure output current (If1, If2) of a respective one of the rectifiers (34a, 34b), and the controller (40) being configured to determine a harmonic of the measured rectifier output currents; the controller (40) being further configured to determine a ratio of the magnitude of the first rectifier (34a) output current harmonic to the magnitude of the second rectifier (34b) output current harmonic, wherein the controller (40) is configured to determine that a fault has occurred in one of the rectifier diodes (38a, 38b) where the ratio exceeds a threshold value.

公开(公告)号：US20160154065A1

公开(公告)日：2016-06-02

申请号：US14926853

申请日：2015-10-29

Applicant: ROLLS-ROYCE PLC

Inventor： Sivakumar NADARAJAN ,  Shantha Dharmasiri Gamini JAYASINGHE ,  Amit Kumar GUPTA ,  Chandana Jayampathi GAJANAYAKE ,  Viswanathan VAIYAPURI

IPC: G01R31/40

CPC classification number: G01R31/40 ,  G01R29/16 ,  G01R31/343

Abstract: A method of assessing a condition of a multi-phase power system comprises the steps of: acquiring a voltage signal and a current signal for each phase of the multi-phase power system; calculating a product of the voltage signal for each phase of the multi-phase power system with one of the current signals such that the product is between a voltage signal for one phase and a current signal for a different phase for at least two of the products; summing the calculated products; and identifying the possible existence of a fault in the multi-phase power system based on a frequency analysis of the summed calculated products.

Abstract translation: 一种评估多相电力系统状况的方法，包括以下步骤：获取多相电力系统各相的电压信号和电流信号; 使用所述电流信号之一来计算所述多相电力系统的各相的电压信号的乘积，使得所述乘积位于所述一相的电压信号与所述产品中的至少两个产品的不同相的电流信号之间 ; 计算产品的总和; 并基于对所计算出的产品的频率分析，确定多相电力系统中可能存在的故障。