POWERFUL TURBOGENERATOR STATOR CORE CONTROL METHOD

Abstract

The article is presented the development of an automatic method and device for monitoring the state of pressing of the stator core of a powerful turbogenerator (TG) during assembly at the factory. The core is assembled and pressed in an upright position by the individual parts, and at each stage of assembly it is necessary to detect places with weakened solidity. Failure to maintain uniformity of the compaction density over the entire volume of the stator core can lead to a relative displacement of the active steel sheets and losses in iron, as well as the appearance and development of the following defects: loosening of the teeth of the end packets, chipping of fragments of the active steel sheets, local closure of the sheets and heating of the packets, which ultimately can lead to hard accidents and TG failure. The initial density of the stator core of a powerful turbo-generator is required by its pressing during manufacture. Existing control methods, including automatic ones, will not allow for quality control. A method and a device are proposed in which, in order to detect places with weakened solidity, an automatic measurement of the specific pressure of the pressing is performed during the deformation of special control easily deformable samples. The device is implemented as a ring mounted on the end surface of the core. In the ring, uniformly with respect to the end surface of the core, N cells with control samples are installed. The largest decrease in sample thickness caused by the highest specific pressure corresponds to the smallest defect, and vice versa. It is proposed to use a flat metal membrane and a capacitive sensor with a digital output as a pressure transducer. The characteristics of the converter are calculated and experimentally verified. Processing of the results of measuring specific pressure is performed using a special electronic unit. Using the device allows to increase labor productivity during core monitoring, diagnose its defects with greater reliability, eliminate them, and, ultimately, increase the reliability of the TG and its durability.