What is overspeed protection?
Unlike the Core 2 or Pentium D processors, the Core i7 CPU can monitor the current it draws as well as its power consumption—if it exceeds a certain level, the processor automatically reduces its clock speed. Intel calls this feature “Overspeed Protection.” The limits hard-wired into the core are 100 A and 130 watts.
What is turbine protection?
A multi-valve, multi-stage turbine protection system incorporates a mechanical overspeed device (trip pin) to shut down the turbine on overspeed (10 percent above maximum continuous speed). The solenoid valve will open on command when any trip parameter set point is exceeded.
How does a turbine overspeed trip work?
When turbine speed reaches an overspeed condition (i.e., 10% above running speed), the centrifugal force on the bolt overcomes the spring force, the bolt moves out and hits a lever which moves the oil dump valve causing depressurization of the oil supply to all steam valves.
What is meant by turbine trip?
A turbine trip is the emergency shutdown of a power-generation turbine due to unexpected events. Due to the number of issues that may cause a trip, they are relatively common events.
What causes overspeed in a generator?
Overspeed is any speed beyond the operating range specified by the engine manufacturer. Very often overspeed leads to serious damage, not only to the engine itself, but also to generators and gears. There are several reasons for overspeed, but the most common is malfunction of the governor or fuel oil pumps.
How do you test overspeed trip of main engine?
It can be tested by increasing the engine speed by speed adjuster at no load condition. Over speed trip will cut-out the fuel supply at 115% of normal speed.
What are the safeties present in a steam turbine?
A steam turbine installation includes a safety system located in the steam flow path having a stop valve located in the steam flow path upstream of the turbine and a vacuum break valve located in the stream flow path downstream of the turbine, and a combined regulating and safety device connected to the turbine …
What causes turbine overspeed?
A turbine overspeed accident can be caused by a lightning-induced power surge, a fouled pilot valve, an electrical fault, operator failure, or any of a few dozen other problems. These systems are built to cut the energy supply to the turbine so that it will coast to an orderly stop.
What causes a turbine trip?
The common causes for a turbine trip are for example: the speed of the turbine shaft increases beyond specific value (e.g. 110%) – turbine overspeed. balancing of the turbine is disturbed or due to high vibrations. failure of the lubrication system.
What happens when a power station trips?
When a generator trips, it means that it is suddenly, and usually unexpectedly, disconnected from the transmission network, and thus stops supplying electricity to consumers.
How are the tube elements of a reheater supported?
The structure is supported on two integral tubular supports which penetrate the shell and provide support for the tube elements and integral framework. The tube elements are therefore allowed to expand vertically from this tubular support near the base inside a sliding linkage arrangement.
How does shell side relief work in a reheater?
Shell-side relief is normally accommodated on vertical reheaters by a combination of bursting diaphragms and pressure relief valves in the hot reheat lines between the reheater and the interceptor valves.
Are there any problems with a vertical reheater?
A problem with vertical reheaters is that the maximum height of the crane hook has to be sufficient to lift the heating elements out vertically. To reduce the amount of cutting during dismantling, the live and bled-steam pipework normally enters the shell through the side wall rather than through the shell cover.
How does heat transfer in a reheater work?
In order to protect the heat transfer surfaces on the inside and outside of the tubes from rusting during prolonged shutdown periods, heated air is blown through the reheater elements on the shell side to keep the ambient internal temperature above the dew point. This prevents rust forming on the outside of the tubes and the shell internals.
