Selection of three-phase asynchronous generator capacitors
The selection of 6-phase asynchronous generator capacitors The practical calculation method of the capacitor capacity of the capacitors required by Fujian Water Conservancy and Electric Power School 3 and the selection of capacitors should be noted. The thesaurus asynchronous generator capacitors and capacitors are currently used in some rural areas where water resources are scarce. Phase-asynchronous motors are often used as generators. This type of motor is used as a self-excited asynchronous generator. The capacitors therein play an important role. Self-excited asynchronous generators are connected to capacitors of both functions. The main capacitor is fixedly connected to the stator winding of the asynchronous motor, and the other group of auxiliary rib capacitors are respectively connected to the distribution line. That is, the auxiliary capacitor is terminated at the negative terminal. The main capacitor provides no-load excitation current for phase-synchronous generator operation, while the auxiliary capacitor uses the excitation current required to increase the load. Compensate for the pressure drop caused by the load. Keep the generator voltage stable. The auxiliary capacitor's capacity can be adjusted to have good operating characteristics. Reasonable choice of capacitors is the key. The practical method of selecting a capacitor here is as follows. 1 When the load is no-load, the main capacitor is set to reduce the capacity of the generator. In the phase generator, the capacitor is generally angled. This type of wiring requires a group of capacitors. When the rated voltage is idling, the capacitance of each phase capacitor, that is, the main capacitor, can be calculated by the following method to calculate the reactive power of the excitation current. Line current frequency where motor technology 2001. The no-load line current of the rated voltage of the generator can be taken as 30 of the rated current of the motor. =0.3. When the shape is connected to no-load, the required capacitance of the phase is the main capacitance. When the connection is idling, the total capacitance required for the head is 2. The approximate calculation of the capacitance when the load is loaded. 2.1 The capacitive capacity of the resistance load generator with resistive load. The current is to overcome its own reactive component R yCos0 type rated load current, 5, asynchronous motor rated power factor with resistive load, capacitor connected by shape, phase capacitance is CR=, Ijy1cos2XIO6 uf such that the capacitance of each phase auxiliary capacitor It can be determined by the value of 0. 2.2 Power negative load With power load, it is necessary to increase the capacitive current to compensate the reactive part of the load. The required reactive power capacity at full load is 52. In the motor-to-child kVar type, 3 of 1 load power factor is full. The ancestor capacitor 1, ie the auxiliary capacitor, can be used as the basis for selecting the auxiliary rib capacitor. When the generator is fully loaded, the total capacitance is set to 3 capacitor voltage size selection considering the sudden cutoff of the load. The pulse voltage received on the main capacitor is sometimes twice as large as the motor terminal voltage, so the rated voltage of the main capacitor. It should be no less than 1.5, 2 times the amplitude of the asynchronous generator terminal voltage. The rated voltage of the auxiliary capacitor is only the generator terminal voltage. 1 times. 4 should pay attention to several capacitor capacitance selection should be appropriate. The generator voltage selected too small does not reach the required value. The voltage adjustment range is small or even a voltage collapse occurs; too large selection is easy to generate overvoltage, and the cost is high. Phase-step generators are mainly suitable for lighting loads. The power supply can only be reduced. General power load accommodation should be below the rated capacity of the generator. And the single unit capacity of the load is not greater than the capacity of the generator 1. Otherwise, the capacitor auxiliary container should be increased by a plurality of sets of small-capacity capacitors in parallel and a switch should be installed. In order to adjust the capacity, the main capacitor can be fixed. When powering the power load, the current is large when the motor is negatively started, resulting in a large voltage drop. Even crashed. The capacitance of the auxiliary capacitor should be appropriately increased in this case. Received 2000052 on the 24th page 5 parameters determination synchronous reactance transient reactance super transient reactance negative sequence reactance zero sequence reactance super transient time constant 5 transient time constant 3 no-load time constant 3 6 outlook with technology The progress, new technologies and new materials are constantly being used in the manufacture of air-cooled steam turbine generators. In addition, increasing the capacity of the single unit can reduce the cost and material consumption of the generator, and reduce the infrastructure installation cost and operating cost of the power plant. To meet the needs of the society for air-cooled turbine generators. Motor manufacturers at home and abroad will increase their development efforts, and believe that there will be more air-cooled steam turbine generators in the future. The heavy-duty generator workshop under construction at Jinan Power Generation Equipment Factory, the largest air-cooled steam turbine generator production base in China, is preparing for the development of 200MW, 300MW air-cooled steam turbine generators. It is believed that the structural characteristics and test results of the main parameters of the 35 slave air-cooled steam turbine generators are described above. To design this air-cooled generator. A lot of work has been done on the study of structural design ventilation systems. Through the factory test, the test results of the prototype are considered to be consistent with the design. Some indicators exceed the requirements of national standards. Meet the needs of users. This provides experience for the development of air-cooled generators with larger stand-alone capacity in the future. 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