Читать книгу Handbook of Large Hydro Generators - Geoff Klempner - Страница 42

The friction and windage loss, including brush mechanical friction, is the power required to drive the unexcited machine at rated speed with the brushes in contact, deducting that portion of the loss which results from

1 forcing the air through any part of the ventilating system that is external to the machine and cooler (if used);

2 the driving of direct‐connected flywheels or other direct‐connected apparatus.

3 In the case of machines furnished with a complete set of bearings, only that portion of the friction and windage loss produced by the bearing load due to the generator or generator/motor itself shall be included. In the case of machines not furnished with a complete set of bearings, only that portion of the friction and windage loss associated with the equipment supplied with the generator or generator/motor shall be included. Where losses are apportioned between equipment or between manufacturers, the method of allocation of the losses shall be subject to agreement between the manufacturer and purchaser.