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Key points in Manufacturing FRP dogbone

There are three main methods of low-voltage reactive power compensation: 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 this compensation method.

1), random compensation. Random compensation is to connect single or multiple low-voltage capacitor banks with electrical equipment separately according to the amount of reactive power required by individual electrical equipment. It shares a set of circuit breakers with electrical equipment. By control, protection device and motor at the same time cutting. Random compensation is suitable for compensating the reactive power consumption of individual large capacity and continuous operation (such as large and medium-sized asynchronous motors) and is mainly based on compensating the reactive power of excitation. This method can limit the peak load of reactive power in the rural power network.

The advantages of random compensation are as follows: when the electrical equipment is in operation, the reactive power compensation is put in, and when the electrical equipment is out of operation, the compensation equipment is also withdrawn, which will not cause the reactive power to reverse, and it is not necessary to adjust the compensation capacity frequently. It has the advantages of less investment, small occupancy, easy installation, convenient and flexible configuration, simple maintenance, and low accident rate.

2), with compensation. Random compensation refers to the low-voltage capacitor is connected to the secondary side of the distribution transformer through the low-voltage switch to compensate the no-load reactive power of the distribution transformer by reactive power. The reactive negative load of the distribution transformer under light load or no load is mainly the no-load excitation reactive power of the transformer. The no-load reactive power of the distribution transformer is the main part of the reactive power load of the rural power network. For the distribution transformer with a light load, this part of the loss accounts for a large proportion of the electricity supply, which leads to the increase of the unit price of electricity, which is not conducive to the same price of electricity with the same network.

The advantages of follower compensation: simple wiring, convenient maintenance, and management, can effectively compensate the distribution of variable no-load reactive power, limit the reactive baseload of the rural network so that the part of reactive power on the spot balance,

Thus, it can improve the utilization rate of the distribution transformer and reduce the reactive power loss. It has a high economy and is one of the commonly used means in reactive power compensation.

3), tracking compensation. Tracking compensation refers to the compensation method of compensating the low voltage capacitor bank on the large user 0.4kV bus with the reactive power compensation switching device as the control and protection device. Applicable to the special distribution users above 100kVA, can replace the random, random two compensation methods, the compensation effect is good.

The advantages of tracking compensation are flexible operation mode, the small workload of operation and maintenance, relatively long service life, and more reliable operation than the previous two compensation modes. But the disadvantage is that the control protection device is complex and the initial investment is relatively large. But when the economy of the three compensation methods is close, the tracking compensation method should be chosen first.