Hydropower Station Equipment Solution

Top Arrangement of the Unit

Oil Receiver (Excluding Outer Cover)

The oil receiver (also referred to as the bearing oil supply system) is a critical lubrication component of the hydro-turbine generator unit. It is primarily used to supply pressurized oil to the thrust bearing and guide bearings, ensuring stable operation under high-pressure and high-speed conditions.

Stator

Power Output: Converts the rotating magnetic field into three-phase alternating current through electromagnetic induction.

Harmonic Filtering: Suppresses 5th and 7th harmonics by employing short-pitch windings (with a pitch of 5/6) and fractional-slot designs (e.g., 72 slots / 6 poles).

Structural Support: Withstands the electromagnetic torque transmitted by the rotor (the stator frame of the Three Gorges unit must withstand torque exceeding 5,000 kN·m).

Rotor

Mechanical Energy Input: Connected to the turbine runner via the main shaft, it receives rotational mechanical energy driven by water flow (speed range: 50-1000 rpm).

Magnetic Field Generation: The excitation winding is supplied with direct current (typically 500-1000V, 2000-5000A) to establish the main magnetic field, forming rotating magnetic poles.

Dynamic Balance: Withstands significant centrifugal forces (e.g., the Three Gorges rotor weighs 1,950 tons, with a peripheral linear velocity >150 m/s).

Magnetic Poles

The magnetic poles of a hydrogenerator are core components of the rotor, undertaking three key functions: establishing the magnetic field, transmitting energy, and ensuring stable operation.

Permanent Magnet Generator, Speed Signal Sensor

The permanent magnet generator is a key component of the generator excitation system. It generates a magnetic field through permanent magnetism, causing the rotor to rotate and output electrical energy.