METHOD FOR DIAGNOSING CURRENT COLLECTOR OF TURBINE GENERATOR AND ITS EXCITATION CONTROL METHOD

摘要

PURPOSE: To report malfunctioning of a current collector by detecting the ripple component of direct current flowing in the brushes of a generator having a stator provided with armature windings, and a rotor provided with field windings and a current collector composed of brushes and slip rings, and judging that the current collector is malfunctioning when it is larger than a specified value. ;CONSTITUTION: When a synchronous generator 1 is started, a starting device 4 is operated with a switch S1 off and with a switch S2 on. And direct current is supplied for excitation from a forward converter 12 to the field windings 6. Next a forward converter 8 and a reverse converter 9 are operated to accelerate the synchronous motor generator 1. When its speed reaches a specified one, the switch S2 for a starting device 4 is turned off and the switch S1 is turned on to transfer it to a power generating condition. The direct current in the field windings 6 from the start to a constant speed during power generating time is supplied from a plurality of slip rings and brushes. When the sliding between the slip rings and the brushes is bad, sparks are generated. Pulsation by the sparks is found by a GT 24 and a detector 23, and when it exceeds a specified value, malfunctioning is reported 50. As a result of this, it becomes possible to generate power stably.;COPYRIGHT: (C)1995,JPO