Power system voltage instability

According to the test, the grid often occurs on computers and precision instruments and interfere with or disrupt the problems are mainly the following:
⒈ Surge: refers to the RMS output Voltage stabilizer is higher than 110% of rated, and the duration of one or more cycles. Surge was mainly due to a large power line connecting

electrical equipment is turned off, the grid due to a sudden unloading pressure generated.
⒉ high voltage spikes: refers to the peak reached 6000v, duration up to one-millionth of a second from the cycle (10ms) voltage. This is mainly due to lightning, arc

discharge, static discharge or large electrical equipment switching operations generated.
⒊ transient overvoltage: refers to the peak voltage of up to 20000V, but the duration boundaries in millionths of a second to a millionth of a second pulse voltage.

The main reason, and may cause damage similar to the high-voltage spikes, but there will be differences in the solution.
⒋ voltage sag: refers to your mains RMS voltage rating of between 80 to 85% between the low state, and the duration of one to several cycles. Large equipment boot,

large motor starting, or access large power electric transformer can cause this problem.
⒌ Wire Noise: refers to radio frequency interference and electromagnetic interference as well as a variety of other high-frequency interference. Motor running, relay

operation, the motor controller work broadcast transmitters, microwave radiation, and electrical storms, etc., will cause line noise interference.
⒍ Frequency Offset: Refers to the mains frequency variation than 3Hz or more. This is mainly run by the instability of the emergency generator, or by the frequency of

the power supply is unstable due.
So use the regulator so that the voltage stability, voltage stability of the voltage electrical equipment, especially for demanding high-tech and sophisticated

equipment is essential.