Turbine Governor Oil Pressure Unit

Oil relay should be usually built to utilize lube oil pressure or a separate governor oil pressure, a double acting oil relay piston permits more precise control of the governor valve. It is integral to the turbine and usually designed by the turbine manufacturer.

lube oil here is lubricating oil? sks

Most modern turbine governors have a high pressure pumping unit that is separate from the electronic devices. Saying that they are separate is like saying that the valves are not part of the governor "system". You can't govern much without/with any one of the components.

The earliest governors were direct drive from a flyweight straight to the valve, later units utilized bearing oil or a combination of bearing and high pressure lube oil.

What prompts the question?

I have worked on a relatively small (50Mw) steam turbine system.

It has a hyrdraulic power unit to that provides closed loop servo control of steam entering and leaving the turbines. It has a very seperate lubrication oil system with seperate reservoir/pump/filters etc. that provide critical lubrication oil to the main turbine bearings. These bearings are ultra-critical and are contiuously monitored for how much clearance is in the bearing,temperature and lubricant pressure.

There is a tie in between the hydraulics and the lubrication oil and the turbine controls. It is ultimately a steam valve that is actuated by high pressure hydraulics oil that is piloted by the lubrication oil. If the lubrication oil pressure drops below a critical level, hydraulic oil piloting the steam valve open is vented causing the steam valve to shut. The steam valve being normally closed makes it intrinsically safe in the event of hydraulic system failure the valve also shuts off.

Not sure if this relates to your "oil pressure unit" but it is all I've got for you.

Hi,

Actually the governing system in Hydro turbine as a whole is a very big system which includes a lot of components which consists of Oil Pressure Unit also called PP set, Pressure receiver also called accumulator, Runner Servomotor (in case of Kaplan Turbine), Guide Vane servomotors, Hydro mechanical cabinet, Runner Control mechanism (In case of Kaplan turbine). Oil pressure unit is just a component. The unit actually acts as a tank for re-storing Oil or replenishment of oil in the Pressure receiver. Governing system is mainly used to regulate the speed of turbine. The speed of Turbine is maintained to keep the frequency constant as per the variation in load.

Darshan