POWER ACCUMULATOR FOR STABILIZATION OF THE PRESSING PRESSURE OF THE CORE OF A POWERFUL TURBOGENERATOR WITH BUILT-IN METER
Authors: Levitskyi Anatolii , Zaitsev Ievgen , Kobzar Kostyantyn 
Published: July 2024

In this paper present described features of stabilization and restoration of pressing force of the stator core of a powerful turbogenerator (TG). Weakening of the pressing forces is the cause of a number of negative phenomena, such as increased vibration and loosening of the core sheets with their subsequent destruction (cracking), which is often the cause of generator damage. It is shown that to assess the state of the pressing force in the core of the TG stator, force meters in the clamping prisms of the core, built into the design of the power accumulator (PA) for stabilizing the pressing force of the core, can be used. The design of the package of disc springs used in PA consists of a package of plate springs and allows to stabilize the pressure in the stator core of a powerful TG to a given level without additional control with probes and fixation by tightening the adjustment nuts. Describes the advantages and features of using PA with a package of disc springs for pressure stabilization, installed under the tightening nuts or instead of them on the threaded ends of the tightening prisms. Proposed to use a built-in force measuring transducer, which consists of an elastic sensitive element (ESE) and a capacitive sensor (CS) into PA structure. The purpose of this article is to create a force meter in the clamping prisms of the stator core of a powerful TG using an elastic sensitive element and a capacitive sensor built into the design of a "caseless" power battery to stabilize the pressing pressure of the stator core of a powerful turbogenerator.
A number of TG and PA parameters, which should know to calculate the mechanical characteristics of the disc spring unit outlined. The dependence of the force of the spring block on the displacement of the pressure plate of the stator core is determined. Showing that the assessment of the force in the tightening prism performed by measuring the electrical capacity between the potential electrode CS and the grounded element of PA. Measuring the height of the block during planned repairs or operation of the turbogenerator allows you to determine with high accuracy the amount of tension on each tightening prism and therefore the compression force of the core and, if it necessary to adjust the pressing force by tightening the springs. The conversion function of the force converter is determined, taking into account the geometric dimensions of the ESE and CS. The calculation of ESE for mechanical strength was carried out. The use of pressure gauges in tightening prisms allows you to effectively restore and maintain the pressing force of the final packages of the stator core, control the pressure during operation and adjust it without stopping the turbogenerator. The obtained results can be used in systems for stabilizing the pressing force of the stator core with power accumulators and in the system for assessing the current state of the stator core of powerful turbogenerators of the TGV-200 and TGV-300 type. Increasing the accuracy of measurements and reducing operational risks will contribute to the rapid and effective restoration of critical infrastructure and ensure the stable operation of energy facilities.