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Technical reference

Turbine Systems

Knowing a turbine by its faults starts with knowing its systems one at a time. These four pages cover the systems my hands are in most often: what each one does, what its normal values are, what it looks like when it fails, and how often it needs attention.

Every page follows the same order: what the system does, its components, how it works, normal operating values, typical faults and a maintenance table. If you already have a fault and want to work backwards from the symptom, the fault diagnosis tree gets you there faster; to see how a real case was actually solved step by step, go to the field notes.

01Pitch SystemThe mechanism that sets blade angle against the wind. Motor, gearbox, sensor and PID control; high-current and asymmetry faults. 02Yaw SystemTurns the nacelle into the wind. Motor, slewing bearing, ring gear, vane sensor; yaw hunting and bearing wear. 03GearboxSteps the slow rotor up to generator speed. Parallel-axis and planetary designs, oil management, temperature control. 04Generator and ConverterTurns mechanical torque into electricity. Induction, DFIG and direct-drive; converter, cooling and insulation.

Frequently asked

Which wind turbine system fails most often?

In geared designs a significant share of downtime traces back to the gearbox and to oil management; the pitch system is the one that raises the most alarms. In direct-drive machines (Enercon) there is no gearbox at all, so that entire failure category disappears and generator thermal management takes its place as the main concern.

What is the difference between pitch and yaw?

Pitch rotates each blade about its own axis, which sets how much power the rotor takes from the wind and acts as the primary brake. Yaw rotates the whole nacelle horizontally to keep the rotor facing the wind. Pitch is power control; yaw is pointing.

What gearbox oil temperature is normal?

It varies with model and load; a typical nominal band is 45–65 °C. Above roughly 75 °C is usually an alarm and above 90–95 °C a shutdown. What matters is not a single reading but the trend of that temperature at the same wind speed over weeks.