How to control voltage sag?

In the power supply network of enterprises and power companies, voltage fluctuations often occur due to the mistakes of large-scale operating equipment, a large number of impact load equipment and natural environment. Among them, the voltage sag is the situation that the power supply voltage of the enterprise power grid quickly drops to 90 %~ 10% of the rated voltage and returns to normal in a short time. However, when the voltage drops temporarily, the system voltage drops, and the production equipment may mediate due to undervoltage, which will affect the normal production of enterprises and even cause serious accidents such as fire and explosion.

Reconstruction principle of preventing voltage sag

For the power supply system, the following principles must be followed when carrying out anti-sway transformation: first, strictly follow the relevant national and industry standards and norms to ensure compliance with national technical and economic policies; Secondly, the anti-shake transformation should provide protection for personal and equipment safety and ensure the economic rationality, safety and reliability of power supply; Finally, the anti-sloshing transformation can not bring adverse effects to the smooth operation of the state grid.

Protective measures to prevent voltage sag

1. In order to improve the anti-sloshing ability of the inverter during operation, Taipu Technology recommends that you use DC- Bank system, and connect the DC bus of the inverter with the DC- Bank system in parallel to ensure the normal operation of the equipment.

2. Because the voltage drop has obvious influence on the low-voltage motor, enterprises can make reasonable setting by using the restart function of the motor protection device.

3. TPM-K anti-sloshing contactor is used in the power control loop. When the power supply system of an enterprise encounters voltage drop, the anti-sloshing contactor can keep internal tripping for a certain period of time to ensure the power supply system in production and use.

Through the above protective measures to prevent voltage sag, enterprises can do a good job in preventing voltage sag from three aspects: inverter, motor and power supply system, which provides a strong guarantee for the smooth operation of enterprise power supply system.