Patent ID: 9203342
Filing Date: 2015-12-01
Classification: G01R,G05B,H02P

Abstract:
1. A method for monitoring at least one subsea electric machine supplied by a system for electric power transmission, the system having power supply, a controller and an AC power line connecting the at least one machine with the power supply, the method comprising the steps of: receiving at the controller, data from at least one subsea sensor arranged between the subsea side of the AC power line and the at least one subsea electric machine, a data communication link comprising an optical cable connecting said at least one sensor with said controller, an A/D conversion unit positioned at the subsea side of the data communication link for converting analogue data to digital data from at least one sensor prior to transmission of the data, an optical transceiver transmitting AD conversion results to the optical cable, a wavelength converter to change the wavelength of the output of the optical transceiver, and an offshore optical multiplexer/demultiplexer which enables the combination of several wavelengths, wherein the data includes measurements of an electrical parameter for the at least one machine; and comparing the one or more measurements to a predetermined value.