What is gas turbine protection?
The gas turbine unit is protected against any possible damage caused to the machine in the event turbine outlet gas temperature exceeds a predetermined limit. In such case the over-temperature protection system trips the turbine to arrest any further temperature increase.
What is the main disadvantage of gas turbine?
The main disadvantage of gas turbines is that, compared to a reciprocating engine of the same size, they are expensive. Because they spin at such high speeds and because of the high operating temperatures, designing and manufacturing gas turbines is a tough problem from both the engineering and materials standpoint.
What are the safety devices on turbines?
This article provides the list of different types of Turbine Protective Devices like turbine over speed trip, low lube oil pressure, axial displacement, turbine temperature and turbine vibrations.
What are turbine protections?
The Turbine Protection System (TPS) provides an additional independent protection function for the steam turbine and generator. The TPS detects undesirable operating conditions and initiates trips to avoid damaging the steam turbine [4].
What are advantages and limitations of gas turbine?
Power Generation/Gas Turbine Power
| Advantages | Disadvantages |
|---|---|
| Less water used since there is no need for a condenser | Temperature of combustion chamber is too high thus resulting in a lower life. |
| Maintenance charges are low | . |
| Can be started quickly | . |
| No stand-by losses | . |
What is heat rate for gas turbine?
According to the EIA, natural gas combined-cycle power generators installed since 2015 have an average heat rate of 6,654 Btu/kWh. This average is nearly 25% lower than units installed before 2000, which have an average operating heat rate of 8,840 Btu/kWh.
Which of the following is the most common maintenance problem in turbine?
Main problems accurse in hydro turbine is cavitation, erosion,fatigue and material defects.
Which type of compressor is used in a gas turbine plant?
Compressor: The air compressor used in gas turbines is of rotary type mainly axial flow turbines. It draws air from the atmosphere and compressed to the required pressure.
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 …
How are steam turbines protected?
Since turbine casings are not normally able to withstand the connected steam supply pressure, they must be protected against overpressure. Condensing machines are often protected by an input to the trip valve that responds to condenser overpressure.
What is tripping of turbine?
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 is critical speed of turbine?
The critical speed of the turbine is the rpm which numerically coincides with the natural frequency of the transverse vibrations of the shaft. At critical speed the deflection of the shaft tends to infinity, therefore the normal speed of the shaft should not coincide with the critical speed of the shaft.