WTT Control Systems & SCADA 3

Question 1

A technician notices a turbine's SCADA shows frequent 'grid voltage fluctuation' faults. Which component should be investigated first?

Accepted Answer

The main circuit breaker and grid monitoring relay

Answer

Grid voltage fluctuation faults point to the grid monitoring relay and main breaker, which monitor voltage levels and disconnect the turbine when grid quality falls outside acceptable limits.

Question 2

What is the function of a 'watchdog timer' in a wind turbine controller?

Accepted Answer

It resets the controller if the main program fails to execute within a set time period

Answer

A watchdog timer resets the controller if the main control program does not periodically reset the timer, indicating a program crash or hang.

Question 3

In IEC 61400-25, what standard does it define for wind turbine communication?

Accepted Answer

Communication standards for monitoring and control of wind power plants

Answer

IEC 61400-25 defines communication standards and data models specifically for monitoring and control of wind power plants.

Question 4

A wind turbine's power curve shows actual output consistently 8% below the reference curve at all wind speeds. What is the most likely cause?

Accepted Answer

Blade contamination, erosion, or pitch angle offset error

Answer

A consistent underperformance across all wind speeds on the power curve typically indicates blade surface degradation or a systematic pitch angle offset affecting aerodynamic efficiency.

Question 5

What does the term 'setpoint ramp rate' mean in the context of active power control for wind turbines?

Accepted Answer

The maximum rate at which the power output setpoint can be changed per unit time

Answer

Setpoint ramp rate limits how quickly the power output target can change, preventing rapid power fluctuations that could destabilize the grid.

(WTT) Wind Turbine Technician Certification Practice Test

(WTT) Wind Turbine Technician Certification Practice Test

WTT Control Systems & SCADA 3