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FIGURE 7 Pump performance (1 hp = 0.746 kW; 1 ft = 0.3048 m; 1 ft3/s = 0.0283 m3/s) (Voith Siemens Hydro)

FIGURE 7 Pump performance (1 hp = 0.746 kW; 1 ft = 0.3048 m; 1 ft3/s = 0.0283 m3/s) (Voith Siemens Hydro)

design of the bearing. It is now standard practice to provide a high-pressure oil pumping system to ensure that there will be a film of oil between the bearing surfaces before the unit starts rotating.

Conventional Generation For generation in the conventional manner, the unit may be started from rest under its own power without assistance from the starting motor.

Rotating Spinning Reserve In considering the requirements for starting the unit for rotating spinning reserve, it will be assumed that the utility is a participant in a grid sys-

FIGURE 8A Synoptic chart for an 8.94-in (227-mm) opening (1 hp = 0.746 kW; 1 ft = 0.3048m; 1 ft3/s = 0.0283 m3/s) (Voith Siemens Hydro)

tem of interconnection by means of extra-high-voltage (EHV) transmission lines of high capability. This means that, immediately upon loss of generation by the local utility, the EHV connection will carry the necessary load for the short time required (about 30 s) for the local pumped storage units to absorb full load. In readiness for just such an emergency, these local pump turbines will be motoring on the line in the generating direction, with the wicket gates and main penstock valves closed and with the tailwater depressed. The loads and procedure for bringing the units up to speed for synchronizing to the line for rotating spinning reserve are identical with those given for operation in the pumping mode except that rotation is in the generating direction.

FIGURE 8B Synoptic chart for a 5.59-in (142-mm) opening (1 hp = 0.746 kW; 1 ft = 0.3048 m 1 ft3/s; = 0.0283 m3/s) (Voith Siemens Hydro)
Survival Treasure

Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

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