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When the magnetic circuit is not saturated, for the salient-pole synchronous generator, since the straight-axis air gap is smaller than the cross-axis air gap, the magnetic resistance of the straight-axis magnetic circuit is smaller than that of the cross-axis magnetic circuit, so that is. 1 pair of factory hidden pole synchronous generator, synchronous reactance by ten-axis and cross-axis magnetic circuit.
When the magnetic circuit is saturated, the direct-axis synchronous reactance decreases with the increase of the magnetic circuit saturation degree; while the cross-axis magnetic circuit air gap is larger, and the near-thousand linear magnetic circuit is substantially constant, that is, the cross-axis synchronous reactance is basically not Affected by the degree of 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 reaction magnetic field and the leakage magnetic field of the generator-symmetrical symmetric steady-state armature, reflecting the armature reaction magnetic field and the leakage magnetic field. The role of the phase circuit. In practical terms. Usually only the synchronous reactance is treated as a single reactance.
2 Determination of steady-state synchronous reactance Since the cross-shaft and the straight-axis armature reaction flux pass through the stator and the rotor core, the corresponding synchronous reactance values ​​are divided into unsaturated values ​​and saturation values.
2.1 Determination of unsaturated direct-axis synchronous reactance Using the no-load characteristics and short-circuit characteristics, it can be determined that the synchronous motor measures the no-load characteristics and short-circuit characteristics of the synchronous generator, and the straight line portion of the no-load characteristic curve is extended to obtain the air gap line as curve 3. Corresponding to the excitation current and the short-circuit current of the Xingshan on the gas, line and short-circuit characteristics of any excitation current. Then the three-step reactance of the three-step reactance is called the unsaturated synchronous reactance. The 1-step reactance measured by the hidden-pole synchronous motor. It is jade. The synchronous reactance measured by the salient-pole synchronous generator is the measurement of the linear-axis synchronous reactance 2.2 saturated direct-axis synchronous reactance. The no-load characteristic and the zero-power characteristic curve can be used to obtain the saturated direct-axis synchronous power. 2. Set on the zero characteristic curve. 4 o'clock. And the corresponding no-load potential of the rated terminal pressure (1) or the value of the core is such that the measured less reactance is called saturated direct-axis synchronous reactance. The saturation state of the mountain in the magnetic circuit is determined by the value of the combined magnetic field in the air gap. If the leakage impedance drop is omitted, it is determined by the value of the terminal voltage. When the generator has different terminal voltages, it is sufficient. 1 should also have a much larger value for different resistance.
Editor Dong Dongxia
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