What is the purpose of installing a neutral point reactor on the main transformer?
By Yang Qiang
March 11th, 2025
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What is the purpose of installing a neutral point reactor on the main transformer?
1、 The function of neutral point reactor Neutral point reactor is an electrical device used to protect power systems by regulating the inductance and resistance in the circuit to limit the flow of current. In the power system, the neutral point of the main transformer is usually connected to the ground wire, but in some cases, overvoltage may occur due to capacitive loads or other factors in the system, which can affect the stability and reliability of the system. Installing a neutral point reactor can effectively reduce the overvoltage of the main transformer and protect the system from the effects of overvoltage. Meanwhile, neutral point reactors can also improve the power factor of the power system, reduce the loss of reactive power, and enhance the energy efficiency of the power grid.
2、 The principle of neutral point reactor The principle of neutral point reactor is to limit the flow of current by changing the inductance and resistance of the circuit. When capacitive loads or other factors cause overvoltage in the system, the neutral point reactor will generate a potential in the opposite direction, thereby offsetting the effect of overvoltage. Neutral point reactors are usually composed of an inductor and a resistor, and their parameters can be adjusted according to the needs of the system. In circuits, neutral point reactors are usually connected between the neutral point of the main transformer and the ground wire to protect the system.
3、 Summary Installing a neutral point reactor on the main transformer can effectively reduce the overvoltage of the system and improve the stability and reliability of the power system. The principle of neutral point reactor is to limit the flow of current by changing the inductance and resistance of the circuit, thereby protecting the system from overvoltage. In practical applications, the parameters of neutral point reactors need to be adjusted according to the needs of the system to achieve the best protection effect.
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