A Test Rig For Endurance Testing And Assessment Of Brazed Joints In Water Box Of Stator Bars Of Water Cooled Generators Under Simulated Condition And A Method For The Same

Abstract: Stator winding bar with brazed water box is kept on height adjustable stands (S1, S2, S3, S4 and S5) and connected with water inlet header (6A) and water outlet header (6B) by flexible hoses (11). Water box is connected to a Electromagnetic vibration Exciter. The water box is initially subjected to Helium leak test. Hot water tank is filled with water. Water is heated upto a temperature Ts degree centigrade by immersion heater. On attaining the required temperature, hot water at temperature Ts degree centigrade is circulated through the stator winding bar by hot water circulation pump (3). On attaining the same hot water temperature at inlet (6A) and outlet (6B) header, water pressure is increased to PS which is between 3Kg/cm2 to 10Kg/cm2. With hot salt water circulating at required temperature and pressure through stator winding bar (TGS) and winding bar under vibration, the test process is continued for about 56 hours for 10X106 cycles of vibration. The temperature Ts is maintained at 65 ? 20C. Fig.1

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