Patent ID: 8957664
Filing Date: 2015-02-17
Classification: G01R,G05B,H01H

Abstract:
1. A method for detecting a crowbar circuit in a wind turbine, wherein the wind turbine comprises a converter electrically connected to the crowbar circuit, wherein the method comprises: electrically coupling a detection module to the crowbar circuit; inputting a first control signal into the crowbar circuit, so as to turn on the crowbar circuit; providing a three-phase voltage signal to the crowbar circuit via the converter, wherein voltage signals in two adjacent phases has a predetermined phase angle difference; reading a first detection signal outputted by the detection module, so as to determine whether the crowbar circuit is thrown into the wind turbine; inputting a second control signal to the crowbar circuit, so as to turn off the crowbar circuit; and reading a second detection signal outputted by the detection module, to determine whether the crowbar circuit is cut out from the wind turbine.