Meanwhile, a stator slot wedge 70 is arranged in the non ferromagnetic material slot 90 opening to fix the stator coil 60, airgap is provided between the stator core 40 and the stator core 10.
At present there are many methods to detect the inter-turn shorted-circuit fault of turbo-generator rotor windings. The air-gap detection coil monitoring method is effective and used widely.