At present, the sensitivity of enterprise relay protection is greatly improved, and voltage quality problems caused by power flicker may cause misoperation of relay protection devices. When the misoperation of relay protection device is serious, it will even cause bus trip and power failure, resulting in heavy load power failure accident and huge losses to enterprises.
Secondly, the influence of power sloshing on the power supply circuit of control appliances.
The influence of power flicker on the main network of power system is specific to all factories and enterprises. In order to prevent electric arc from injuring people and protect the normal operation of electrical equipment, a large number of AC contactors will be connected to the power system. The low voltage and short-term power failure caused by lightning will disconnect the contactors in the system, cut off the power supply circuit and cause huge losses to the factory.
Third, the influence of electric sloshing on frequency converter
When the inverter controls the motor to adjust speed, there will be power flicker. Sudden voltage drop and short-term power failure will stop the inverter, which will lead to the inverter's inability to adjust speed, which will have serious consequences for the control motor and even lead to a major accident in which the motor does not turn. No matter what kind of inverter structure, sudden voltage drop and short-term power failure will cause the inverter to stop working. Therefore, in the case of motor speed regulation, the inverter must be protected by anti-shake products to avoid serious accidents.
Fourthly, the influence of electric sloshing on running motor.
For the running motor, when the power system is subject to power sloshing, the voltage drop or sudden rise will increase the current of the running motor in the power system; However, due to the short duration of this phenomenon, the impact on the motor is not very serious. However, in some occasions with strict requirements for motors, it is also necessary to prevent the influence of electric sloshing on motors.