Our company has 11 synchronous machines, and the electricity load accounts for about 50% of the total load of the whole plant. It is the main electrical equipment used in the company's production. Therefore, whether the excitation equipment can operate normally will be the key to stable production and energy conservation. If the excitation equipment can maintain normal operation, the power factor is maintained above 0.9 according to its capacity, which can fully compensate the reactive power of all asynchronous motor groups.
1 Excitation system application analysis Our company's synchronous machine uses the excitation products of the 1970s - KGLF10 series three-phase full control bridge single-unit component control equipment, using 11 unit type connectors, each connector Both consist of discrete components of the transistor. In principle, the device is a relatively mature product.
1.1 Synchronous motor working principle Synchronous motor is a bilaterally excited AC motor composed of stator current excited by alternating current to establish a rotating magnetic field and excited by DC current. During the entire starting process of the synchronous machine, the frequency of the rotor induced alternating voltage varies with the acceleration of the rotor. The higher the speed, the lower the frequency of the induced alternating voltage. At the moment of starting the motor, the rotor induced voltage frequency is the same as the stator loop grid frequency, and the rotor induced voltage frequency when reaching any slip is: /='=50-s. When the synchronous motor accelerates to subsynchronous (synchronous speed 5%), the slip s=0.05, then the rotor induced voltage frequency is: /=2.5Hz. When one motor enters the sub-synchronous speed, the excitation excitation phase receives the rotor induced voltage with a voltage frequency of 2.5 weeks, and the polarity When the signal is pulsed, the thyristor in the phase shifting step is triggered to provide a control voltage to the base of the triggering plug, thereby exciting the synchronous motor and dragging the synchronous motor into synchronous operation.
1.2 Automatic excitation circuit analysis The synchronization process of the synchronous machine is a very important link. In order to ensure a certain theoretical basis during maintenance, we analyzed the link. The circuit principle is as follows. In the circuit, the 1 and 10 lines are respectively connected to the DC side of the main circuit bridge. When the motor enters the subsynchronous speed, the voltage of the terminals 1 and 102 reaches the setting value, so that the 18BG1 is turned on, and the 18BG2 is discharged and discharged through the 18C2, and the pulse is output through the BT. On the secondary side, a pulse signal is sent to trigger the small thyristor 2KGZ1 in the phase shifting link (given the link), so that the triggering step is triggered, and the synchronous machine enters the excitation state.
Circuit model such as. Simplified circuit schematic According to the circuit model, the following equation is given: returning the equipment input cost of the reactor; significantly prolonging the service life of the bulb and other electrical equipment, reducing maintenance costs and reducing maintenance workload. At the same time, it also improved the lighting rate and improved the night lighting environment of the bridge. Since the reactor is connected in series on the power supply line, it also has a good effect on suppressing transient spike current and eliminating harmonics. Therefore, adding a step-down reactor is a low-cost, high-return, simple and reliable power-saving technical reform measure. .
Table 2 test data table installed reactor front lamp main line three-phase voltage / V installed reactor rear lamp main line three-phase voltage / V installed reactor front lamp main line three-phase current / A installed reactor rear lamp main line three-phase Current / A installed reactor three-phase power consumption / kW winter 5I installed reactor 6 after three-phase power consumption / kW with a new single air gap buck reactor technology as the core of the LI type street lamp power saver It has obtained the patent right of China, successfully passed the scientific and technological achievements appraisal of Jiangsu Science and Technology Commission, and has been promoted and used in many famous power supply systems, and achieved good social and economic benefits.
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