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The Synchronous condenser is a commonly used device for power grid compensation. It plays an important role in the power system. In order to control the temperature rise in the winding within the allowable range, the water channel is blocked when the Synchronous condenser stator is cooled by water. Fault is one of the common faults, which affects the safe and reliable operation of the Synchronous condenser. In order to reduce the probability of fault occurrence, it is necessary to study the relationship between the degree of blockage of the wire rod and the temperature. In this paper, a 300Mvar Synchronous condenser is taken as the research object, and the distribution of the temperature field of the stator bars under different blocking degrees is studied. Introduction Faults caused by blocked or broken water in the stator winding account for more than half of the total faults of the generator [1]. When the motor is blocked by a hollow conductor or water is broken, the stator winding is destroyed, and in severe cases, the stator core is damaged [2]. The stability of the water cooling system of the Synchronous condenser is related to the safe and stable operation of the unit. The water cooling system directly affects the health and insulation life of the winding strands. Therefore, it is necessary to test and test the water cooling system of the Synchronous condenser [3]. In China, Professor Lu Yiping from Harbin University of Science and Technology and his students used fluid dynamics software to analyze the original structure and reduce the temperature distribution of the stator end and the pressure finger after the end of the stator end and the size of the spacer. The results show that Reducing the binding of the end of the stator and the size of the spacer can reduce the temperature rise of the end winding [3]. Li Weili et al. simulated the change of the thickness of the motor core and the number and size of the ventilation groove. The improved structure is more than the original structure. The lower temperature rise is reduced, indicating that the reasonable design of certain structures of the motor can reduce the temperature rise of the motor to a certain extent [4]. In foreign countries, many scholars have also carried out a lot of research on the fluid field and temperature field in the motor. JiĜí Franc, Vladimír Kindl and others analyzed the fluid field and temperature of the stator ventilation duct wind road with different blockage degree for a steam turbine generator. The distribution of the field provides a reference for the design of the stator ventilation gullies of large steam turbine generators [5]. Ken'ichi Hattori studied the air-cooled steam turbine generator of 250MVA and analyzed the influence of the ventilation and heat dissipation system of the motor on the insulation of the stator strand. The calculation results meet the requirements of insulation and temperature, and provide ventilation and cooling for the air-cooled turbine generator. The design of the system laid the theoretical foundation [6].

Study on the Blockage and Temperature Distribution of Stator Bar Strands in Water-cooled Large Synchronous Condensers