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When the magnetic circuit is not saturated, for the salient-pole synchronous generator, since the air gap of the straight shaft is smaller than the air gap of the quadrature axis, the magnetic resistance of the direct-axis magnetic circuit is smaller than the magnetic resistance of the quadrature-axis magnetic circuit, so in particular. 1 The plant's hidden pole synchronous generator is composed of ten dozen axis and quadrature axis magnetic circuit synchronous reactance.
When the magnetic circuit is saturated, the direct axis synchronous reactance decreases with the increase of saturation of the magnetic circuit; while the magnetic gap of the magnetic circuit of the axe axis is large, and the nearly linear magnetic circuit 1 is basically constant, that is, the synchronous impedance of the quadrature axis is basically not Affected by the saturation of the magnetic circuit of the motor.
In summary, the synchronous reactance is an important parameter of the synchronous generator and a comprehensive parameter of the symmetrical and steady state operational armature reaction magnetic field and leakage magnetic field of the generator, and reflects the armature reaction magnetic field and the leakage magnetic field respectively. The role of the phase circuit. Practically. Usually only the synchronous reactance is treated as a single reactance.
2 Determination of steady-state synchronous reactance Because the flux of the armature reaction of the quadrature axis and the straight axis passes through the stator and rotor cores, the corresponding synchronous reactance values ​​are divided into the unsaturated value and the saturation value.
2.1 Measurement of unsaturated direct-axis synchronous reactance The no-load characteristic and short-circuit characteristic can be used to determine the synchronous motor's no-load characteristics and short-circuit characteristics of the synchronous generator. The linear part of the no-load characteristic curve can be extended to obtain the air gap line such as curve 3. Corresponds to any excitation current in the gas, line and short-circuit characteristic curve of the apricot excitation potential and short-circuit current. The three-step reactance is not saturated so that the measured one-step reactance is called an unsaturated synchronous reactance. One-step reactance measured for a hidden synchronous motor. That is jade. The synchronous reactance measured by the salient-pole synchronous generator is a direct-axis synchronous reactance. 2.2 Saturated direct-axis synchronous reactance is measured. The no-load characteristic and the zero-power characteristic curve can be used to obtain the saturation direct-axis synchronous current. 2. It is set on the zero characteristic curve. 4 o'clock. And the corresponding nominal no-load potential (1) or the center-of-centre calibration value of the rated end-conformation is such that the measured small reactance is called the saturated direct-axis synchronous reactance. The saturation condition of the magnetic circuit in the mountain depends on the value of the resultant magnetic field in the air gap. If the leakage impedance drop is omitted, the value of the terminal voltage is determined. When the generator has a different terminal voltage, it's enough. 1 There should also be a much larger number of different resistances.
Editor Xi Dongxia
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