With economic business development, the non-linear load will increasing deviation from sine wave power supply system will become increasingly serious distortion of the electrical systems and electrical equipment will have a serious impact and danger.
| Cause of pollution | Possible consequences | |
| Harmonic | Non-linear loads, such as electronics, core excitation class for electric arc furnace | Shorten the life of electrical equipment, severe overvoltage, overcurrent or overload can lead to equipment failure |
| Voltage Flicker | Sudden changes in load, such as electric arc furnace | Make eye discomfort generator excitation system is unstable and the transformer OLTC |
|
Unbalanced
And broke into the voltage
|
Single-phase loads such as phase frequency furnace, high-speed rail, rapid transit system | Motor overheating, computer monitors, communications interference |
| Inrush current | Electric shock, switch and capacitor switching | Too high or too instantaneous flow may cause the device to malfunction |
| Pulse | Household appliances, mobile phone transmission and distribution wires | Protection relay malfunction, communications interference |
| Voltage sag | Shock, salt damage and man-made disasters | Momentary power failure |