Power Accumulator for Stabilizing the Pressing Pressure of Powerful Turbogenerator Stator Core with a Fiber-Optic Force Meter in the Clamping Prisms
DOI:
https://doi.org/10.31649/1997-9266-2023-169-4-61-67Keywords:
powerful turbogenerator, stator cores, compression pressure, power accumulator, block of plate springs, fiber optic sensor with Bragg gratings, forces in clamping prismsAbstract
The paper describes the advantages and features of using power accumulators (PA) for powerful turbogenerators (TG), in which plate spring blocks are used to restore and stabilize the compression pressure of the stator core. Groups of PA are installed under the clamping nuts or instead of them on the threaded ends of the clamping prisms of the core. Measuring the forces of the clamping prisms in PA makes it possible to estimate the current state of the compression pressure in the core. To measure forces at clamping prisms the construction of PA with a fiber optic sensor based on Bragg gratings is proposed. The use of an optical sensor, which is a Bragg grating, ensures the efficiency of measuring forces in the clamping prism and compression pressure. Moreover, the proposed measuring transducers have immunity to influence of powerful electromagnetic fields, which occur during the operation of powerful generators. According to the given design parameters of the PA and mechanical characteristics of the plate spring block, a fiber optic force measurement sensor was developed and its characteristics were determined. The forces in the prisms is measured using a dielectric tubular force-receiving element and a ring measuring elastic element connected to it by light tension. Structural diagram of fiber-optic system with Bragg gratings for measuring forces in N clamping prisms of a powerful TG is proposed. The method of monitoring the state of the TG stator core using the PA system with a fiber-optic sensor, based on Bragg gratings is described. The processing of the measurement results in the clamping prisms is carried out , using a fiber-optic sensor, based on Bragg gratings, located in the PA , using an interrogator and a personal computer. The use of the device in the stabilization system makes it possible to increase the reliability and efficiency of monitoring the actual technical condition of the core, as well as more reliably to diagnose its defects with their subsequent elimination, both during its operation and during preventive and repair measures. The use of the developed information and measurement tools will ultimately increase the reliability of TG and its durability.
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