The monograph is devoted to the development of new and improvement of existing methods and means of control of the stator core of powerful turbine generators (TG), which is one of the main components of machines and whose technical condition affects the technical characteristics and performance of machines. The topicality of the work determined by the growing requirements for information and measurement systems for monitoring and diagnostics of powerful TG to ensure their reliable and trouble-free operation. Shown that the main features of powerful TG, which determine the choice of technology to provide elastic compression of the stator core, are the method of collecting the core, the method of combining the core in the stator housing, the design of the end zone of the stator core and the cooling system. The main factors of reducing the degree of compression of the core, which include technological, operational and structural analyzed.
The results of an analytical review of modern methods and means of restoring and stabilizing the pressing pressure of the stator core of a powerful turbogenerator (TG) during operation are presented. The advantages and features of the use of power accumulators (PA) with blocks of disk springs for pressure stabilization, which are installed under the tightening nuts or instead of them on the threaded ends of the tightening prisms, are described. A number of TG and PA parameters that must be known to calculate the mechanical characteristics of the conic springs unit are outlined. It is shown that the optimal method of assembling disc springs into blocks in CA is combined (series-parallel). Based on the specified design parameters, the dependence of the force created by the disc spring and the spring block on the spring thickness was obtained. The dependence of the force of the spring block on the displacement of the pressure plate of the stator core for different values of the spring thickness was determined. The method of calculating the strength of disc springs is given. Ref. 12, fig. 9.
A capacitive sensor for measuring the air gap between the boring of the stator core and the poles of the rotor in a powerful hydrogenerator is proposed and investigated. The sensor consists of a system of equal in width tape parallel coplanar high-potential and low-potential electrodes, between which grounded electrodes are placed. The ratios between the width of the high-potential, low-potential and grounded electrodes are selected depending on the size of the nominal gap. The electrodes are formed on a dielectric substrate mounted on the boring of the stator core. To reduce the effect of edge effects on the short sides of high-potential electrodes, the length of the low-potential electrodes is chosen to be smaller than the length of the high-potential electrodes by a value determined by the nominal gap. It is proposed to place all electrodes along the length perpendicular to the boring core generatrix to reduce the measurement error due to the influence of the rotor pole curvature. The electrical capacitance between the system of high-potential electrodes connected in parallel and the system of low-potential electrodes connected in parallel, which functionally depends on the size of the air gap, is measured. Analytical and graphical dependences for the sensor conversion function intended for use on a SGK538 / 160-70M bulb hydrogenerator have been determined. The value of the error caused by the curvature of the rotor poles in this hydrogen generator was calculated. The sensor in comparison with analogs has higher accuracy of measurement. The sensor or sensor system can be used as a stand-alone device or as part of monitoring and diagnostic systems. References 19, figures 6.
A new compensation bridge measuring transducer is proposed for operation with capacitive sensors having grounded electrodes. Two variants of its construction are described: with analog and with analog-digital balancing of charges on sensor capacitors. The advantages of the converter with analog-digital balancing are noted: compactness and improved speed. The research results of the error from the nonlinearity of the conversion characteristic of the experimental sample of the device are given. It is shown that the proposed converter provides a combination of high accuracy with a high conversion rate of informative parameters of capacitive sensors with grounded electrodes. References 9, figures 3, table 1.
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