无功补偿原理（Principle of reactive power compensation）.docVIP

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无功补偿原理（Principle of reactive power compensation）.doc

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无功补偿原理（Principle of reactive power compensation）

无功补偿原理（Principle of reactive power compensation） Low voltage reactive power compensation I. Basic knowledge of reactive power compensation (1) power and power factor 1, active power: in the DC circuit, the power from the power supply to the electrical (load) is the product of the voltage and current, that is, the actual power absorbed by the electrical equipment. In AC circuits, because of resistance and reactance (inductance and capacitance) exist at the same time, so the power supply to the electric power appliances not completely work. Because some of the electrical power (the electric energy stored in the inductor and capacitor) can still be returned to the power supply, the actual power absorbed by the device is called active power. Use the letter P. The international unit watt is represented by the letter W. Usually the unit of active power is expressed in kW, with the letter KW. 2, reactive power: inductance and capacitor storage power can still be back to the power supply, this part of power in the power supply and reactance between the exchange, exchange without consumption, called reactive power. The letter Q indicates that the international unit is short and is represented by the letter var. Usually, the reactive power unit with kilovar, represented by the letter Kvar. 3 、 inductive reactive power: many electrical equipment connected to the power grid works according to the principle of electromagnetic induction. For example: through a magnetic field, the transformer can change the voltage and send out the energy, the motor can rotate and drive the mechanical load. The magnetic field of a magnetic field can be supplied by a power source. In the process of energy conversion, the motor and transformer build an overpass magnetic field, and the power absorbed and released in a cycle is equal. This power is called inductive reactive power. 4, the capacitive reactive power capacitors in AC power network connected, in one cycle, the discharge power is equal to t