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Principles and significance of reactive power compensation by big tree
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Principles and significance of reactive power compensation by BIG TREE
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| Article Posted: 07/20/2010 |
| Article Views: 47 |
| Articles Written: 1033 - MORE ARTICLES FROM THIS AUTHOR |
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Principles and significance of reactive power compensation |
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Business,Business News,Business Opportunities
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1. The principle of reactive power compensation
Output power grid consists of two parts; one active power; second is the reactive power. Direct consumption of electrical energy into mechanical energy to electrical energy, thermal energy, chemical energy or sound energy, use of these can be successful, this part of the power that for the active power; do not consume energy; just energy into another form of energy, such as electrical equipment can be a prerequisite for success, and that this can be carried out in the periodic grid with power conversion, This part of the power called reactive power, such as the electromagnetic component of power occupied by the establishment of the magnetic field, electric field capacitor to establish the share of electricity. current in the inductor for power, the current lead the voltage 90 . The current in the capacitor element for success in , the current lags voltage 90 . in the same circuit, the inductor current and capacitor current in the opposite direction, each difference 180 . If the ratio of electromagnetic device installed in the circuit capacitive elements, so that the two currents cancel each other out, so that current vector and voltage vector angle between the reduced, thereby improving the capacity of electricity for power, reactive power compensation that is the truth.
2. The meaning of reactive power compensation
(1) compensation for reactive power, can increase the proportion of constant active power grid
(2) reduced-fat, power equipment, design capacity, reduce Investment , For example, when the power factor cos = 0.8 to cos4 = 0.95, the capacitor can save equipment installed capacity 1Kvar 0.52KW; Conversely, increasing 0.52KW. On the original equipment, the equivalent of increasing the hair, power supply equipment capacity. Therefore, new construction, renovation works. should take full account of reactive power compensation, it can reduce the design capacity, thereby reducing investment.
(3) reduce line losses, by the formula P% = (1-cos /cos ) X100% reached after which cos to compensate for power factor, cos for the power factor before compensation is
Cos > cos , so to improve power factor, the line loss rate also fell. Reduce the design capacity, reduce investment and increase the transmission power ratio of the active power, and reduce line losses have a direct impact on the decision and power supply enterprises economic benefits. Therefore, the power factor is Assessment Important indicator of economic efficiency, Planning The implementation of reactive power compensation is imperative.
3. The principle of reactive power compensation
Increase Electricity Units of the natural power factor, reactive power compensation is divided into centralized compensation, dispersion compensation and were compensated with the device, it should follow: overall planning, rational distribution, Classification Compensation, local equilibrium; focus on the combination of compensation and dispersion compensation, dispersion compensation to the Lord; high voltage and low voltage compensation compensation combined with low-voltage compensation-based; surge combined with lower loss, loss of the main principles of dynasties.
4. A combination of reactive power compensation equipment components
(1) Low-voltage reactive power compensation equipment, a combination of components
reactive power automatic compensating controller According to whether the reactive power set value to control the reactive power capacitors of the input and removal, and had, under voltage protection
contactless smart composite thyristor switch module or
capacitor (with a discharge within the resistance)
fuse Current Transformer arrester switch reactor (for non-contact switch to play the role of over-current protection; on the prevention of over-current also plays a suppression capacitor Make Use)
In addition, the table assembly to monitor the voltage used, current meter, power factor meters and signal lights, etc.. [Popular Keywords]: Saving Reactive power compensation Comment Large In Small I am a professional writer from China Manufacturers, which contains a great deal of information about $keyword_li, welcome to visit!
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