Contact Us
Nancy

Phone Number : +8613408630944

WhatsApp : +8613408630944

The Basic Working Principle of Hydroelectric Generator II

November 17, 2020

Synchronous generators are divided into three types: turbo generators, hydro generators and diesel generators according to the different prime movers used. The common point in their structure is that except for small motors that use permanent magnets to generate a magnetic field, the general magnetic field is generated by a DC excitation coil, and the excitation coil is placed on the rotor, and the armature winding is placed on the stator. Because the voltage of the excitation coil is low, the power is small, and there are only two outlets, which are easy to lead out through the slip ring; while the armature winding has higher voltage and high power, mostly three-phase windings, with 3 or 4 outlets , It is more convenient to put it on the stator. The armature (stator) core of the generator is laminated with silicon steel sheets to reduce iron loss. The rotor core can be made of an integral steel block because the magnetic flux passing through it remains unchanged. In large motors, because the rotor bears strong centrifugal force, the material for the rotor must be high-quality steel.

 

The generators of hydro power plants are synchronous motors, which can convert the mechanical energy of the prime mover (water turbine) into electrical energy, which is sent to users through equipment such as power transmission lines. We know that wire cutting magnetic lines of force can generate induced electromotive force. Connecting the wires into a closed loop, there is current through the synchronous generator, which uses the principle of electromagnetic induction to convert mechanical energy into electrical energy. The wire is placed in the core slot of the hollow drum, and the core is fixed when it is called the stator. The lines of magnetic force are produced by the magnetic poles, which rotate when the magnetic poles are, called the rotor. The stator and rotor are the most basic parts of a generator. In order to obtain three-phase alternating current, three-phase windings A-X, B-Y, C-Z are placed along the inner circle of the stator core every 120 degrees, and there are excitation windings (also called rotor windings) on the rotor. Through the sliding contact of the brush and the slip ring, the direct current generated by the excitation system is introduced into the rotor excitation winding to generate a constant magnetic field. When the rotor is dragged and rotated by the prime mover, the stator winding continuously cuts the magnetic lines of force, and electromotive force is induced in it. Wire cutting magnetic lines of force can generate induced electromotive force. When the wires are connected into a closed loop, current flows through. The synchronous generator uses the principle of electromagnetic induction to convert mechanical energy into electrical energy. The wire is placed in the hollow barrel iron core slot, the iron core is fixed, called the stator. The lines of magnetic force are generated by magnetic poles, which rotate, and are called rotors. The stator and rotor are the most basic parts of a generator. In order to obtain three-phase alternating current, three-phase windings A-X, B-Y, C-Z are placed along the inner circle of the stator core every 120 degrees, and there are excitation windings (also called rotor windings) on the rotor. Through the sliding contact of the brush and the slip ring, the direct current generated by the excitation system is introduced into the rotor excitation winding to generate a constant magnetic field. When the rotor is dragged and rotated by the prime mover, the stator winding continuously cuts the magnetic lines of force, and electromotive force is induced in it.

86221