Low-Voltage Reactive Compensation There are three main methods we usually use: random compensation, follower compensation, and tracking compensation. The following is a brief introduction to the scope of application of these three compensation methods and the advantages and disadvantages of using such compensation methods.
1. Random compensation Random compensation is to connect the low-voltage capacitor bank and the motor, and control and protect the device and the motor at the same time. The random compensation is suitable for compensating the reactive power consumption of the motor to compensate for the magnetic reactive power. This method can better limit the reactive power peak load of the rural power grid.
The advantage of random compensation is that when the power equipment is running, the reactive power compensation is input, and when the power equipment is out of service, the compensation equipment also exits, and the compensation capacity does not need to be adjusted frequently. It has the characteristics of less investment, small occupancy, easy installation, convenient and flexible configuration, simple maintenance and low accident rate.
2. The follower compensation follower compensation means that the low voltage capacitor is connected to the secondary side of the distribution transformer through low voltage insurance to compensate the no-load reactive compensation mode of the distribution transformer. The reactive load of the transformer at light load or no load is mainly the no-load excitation of the transformer, and the variable-load no-load reactive power is the main part of the reactive load of the rural power grid. For the light load distribution, this part The loss accounts for a large proportion of the power supply, which leads to an increase in the unit price of electricity, which is not conducive to the same price of electricity on the same network.
The advantages of the follow-up compensation are: simple wiring, convenient maintenance and management, can effectively compensate the no-load and reactive power of the distribution transformer, limit the reactive load of the rural power grid, and make the part of the reactive power balance on the ground, thereby improving the utilization ratio of the distribution transformer and reducing Reactive power loss, which has high economical efficiency, is one of the most effective means of compensating for reactive power. 3. Tracking compensation Tracking compensation refers to the compensation method of the reactive power compensation switching device as the control protection device to compensate the low voltage capacitor bank on the 0.4kv busbar of large users. It is suitable for special distribution users above 100kVA, which can replace the random and follow-up compensation methods, and the compensation effect is good.
The advantages of tracking compensation are: flexible operation mode, small operation and maintenance workload, longer life and more reliable operation than the first two compensation methods. However, the disadvantage is that the control protection device is complicated and the initial investment is relatively large. However, when the economics of these three compensation methods are close, the tracking compensation method should be preferred.
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