Phep Ch 11

Question 1

What must the governors maintain?

Answer 1

A balance between the water input to the turbines and the power requirements on the system

Question 2

Governor setting and response must take into consideration many different variables such as?

Answer 2

Allowable loading of transmission lines

Maximum loading of tie lines between systems

Hydraulic characteristics of the penstock and turbine

Flywheel effect of the rotating mass of the turbine and generator

Question 3

Any change in the position of the flyballs is transmitted to the pilot valve by the?

Answer 3

Speeder rod

Question 4

Where is the compensating dashpot inserted at?

Answer 4

Restoring mechanism linkage

Question 5

The time required to center the small plunger is determined by the setting of the?

Answer 5

Dashpot needle valve

Question 6

The compensating dashpot serves to prevent over travel or hunting of the gates by re-centering the?

Answer 6

Pilot valve

Question 7

An additional adjustment is provided in the speed adjustment linkage to cause the governor to add speed adjustment in the lower direction as the gates open wider. This adjustment is called?

Answer 7

Speed droop

Question 8

A governor with zero speed droop is called an?

Answer 8

Isochrounous governor

Question 9

The governors of unit designated to regulate system frequency will generally have a speed droop setting of closer to?

Answer 9

0%

Question 10

Governors have many built in safety devices such as?

Answer 10

Over speed devices may be provided to close the gates if the speed exceeds a predetermined value

Low governor oil pressure switches may be give alarms or shut the gates if the governor oil pressure drops below a certain pressure

Some governors prevent water hammer pressure damage by opening auxiliary nozzles if the main nozzle closes too rapidly