This paper presents the results of research and development of capacitive-based sensors of rotating shaft vibration for fault diagnostic systems of powerful turbines and hydro generators. It showed that diagnostic systems with special sensors are the key to increasing the reliability of powerful turbines and hydro generators. The application of sensors in monitoring systems was considered, and the requirements for the sensors used were analyzed. Structures of concentric capacitive-based sensors of rotating shaft vibration based on the measurement of the capacitance value from the distance to the metal surface were proposed. The design scheme was created for determining electrode dimensions of the rotating shaft vibration capacitive-based sensors with concentric electrodes, and analytical dependences were obtained. The calculation results allow the selection of optimal parameters of the active and guard electrodes. Analytical and computer simulation methods determined the response functions of the capacitive sensors. Analytical calculations and simulation results using 3D FEM were used to find the response functions of the sensors. The calculation of the characteristics of the capacitive-based sensors of rotating shaft vibration is presented. The study of the influence of fringe effects was carried out using the obtained results of the modeling and analytical calculations.
Розроблено о птимальні схеми установки сенсорів віброприскорення, пристрій контролю зусиль затягування осердя статора та діагностичні процедури. Для підтвердження теоретичних положень проведено експерименти на фізичній моделі кінцевої зони осердя статора турбогенератора. Встановлено вплив розвитку дефектів пресування зубцевої зони осердя на гармоніки вібрацій основної частоти електромагнітних зусиль. Бібл. 12, рис. 5. Ключові слова: турбогенератор, моделювання, шихтований магнітопровід, осердя статора, зубцева зона, натискні пальці, механічні напруження, зусилля, лінійне видовження.
The mechanical characteristics in a copper and isolation of the turbogenerator 300 MW stator winding under a nominal loading has been searched by a numeral method at the different variants of fixing in the core end zone. Distribution of a radial and axial movements and a mechanical tension in isolation on a length of an outhang bar under action of an elektrodynamic forces is received. Changes of the indicated above characteristics when weakened a fixing of an outhang bars in a stator end zone are estimated. The new advanced design of a fixing it at an exit from a core for minimization a moving of a turbogenerator stator outhan is offered. Refe rences 10, figures 3.
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.
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