Generator comprehensive knowledge

2017-03-27 14:56:32   
1 What is a "synchronous generator synchronous speed " is the answer: how do you determine the generator is the
1. What is a "synchronous generator synchronous speed" is the answer: how do you determine the generator is the heart of the power plant equipment generators driven by its power can be roughly divided into hydrogenerator (hydraulic) and steam turbine generator (steam). The book content are involved (limited to vertical hydro-generator) refers to the synchronous generator.
Generator in normal operation, in the air gap between the generator stator rotor with the synthesis of a rotating magnetic field, the magnetic field is synthesis by two: rotor magnetic field and stator magnetic field. The so-called "synchronous generator, is refers to the speed of the generator rotor magnetic field (prime mover) and the speed of the stator magnetic field (decision) power system frequency is equal.

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By the rotation of the rotor magnetic field has a dc of rotor winding (pole), the speed of the rotor magnetic field is the rotor speed, namely the rotational speed of the unit. The rotor, driven by a prime mover speed adjusted by the governor of unit, the rotating speed on the nameplate of the generator are clearly marked. The stator rotating magnetic field by through the three-phase symmetrical current of stator three phase winding (by 120 ° symmetric arrangement), its speed determined by type (type: p for the logarithmic rotor poles; f for power system frequency; n unit for speed), visible from the type, of a specific generator, its magnetic poles logarithm is fixed, and the frequency of the power system in our country is fixed, the 50 hz (also called a power frequency), visible for each specific generator after completion of the rotational speed of the stator rotating magnetic field in generator manufacturing is "fixed value". Of course, the frequency of the power system is not really stable in the theoretical value of 50 hz, but allows for a small fluctuations in the value of the up and down, that is actually in the operation of the stator magnetic field in around the rated speed value of dynamic change. The rotor magnetic field to sync with the stator field has to adapt to this change, namely speed for dynamic adjustment of the unit. If the speed cannot be aligned with the stator magnetic field, we say "out of step" with the generator.
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