device for utrona leckstellen in a kylvattenkretslopp in an electrical machine

摘要

1362924 Leak testing KRAFTWERK UNION A G 2 Nov 1972 [5 Nov 1971] 50644/72 Heading G1S [Also in Division H2] In an electrical machine, such as a turbogenerator, which has a main gas tight housing supplied with a gas and a water cooling circuit, leakage in the water cooling circuit is detected by adding an indicator such as helium or tritium to the gas or the cooling water, and detecting the presence of the indicator in the cooling water or gas respectively. In Fig. 1, hydrogen is passed through housing 5 to cool the rotor 3 and the laminations of stator 2, and water flows through the stator windings 6. Helium is added to the gas in housing 5 via valve 16, and a helium detector 17 is provided in the cooling water expansion tank 12. In an alternative arrangement, Fig. 2 (not shown), tritium is added to the cooling water, and the hydrogen from housing 5 is passed through a counter. In an alternative construction Fig. 3 (not shown) the cooling water containing tritium passes through both the stator and rotor windings of the machine. In Fig. 4, the stator, the rotor and the stator laminated core are supplied with cooling water into which helium or tritium is injected at 18. The air gap 25 is sealed at 26 and 27, and is evacuated, while the machine housing 5 is filled with natural gas. Leakage of the cooling water into hqusing 5 and into air gap 25 is detected at 20 and 29 respectively.