In the field of electrical engineering, a high total voltage distortion rate can cause many serious hazards. Below is a detailed introduction for everyone.DNV Voltage Total Distortion Elimination Stabilizer
1、 The harm of high total voltage distortion rate
1. Hazards to transformers
-The transformer noise increases, and the iron core will make a loud scream.
-An increase in iron loss and line loss can cause a significant increase in magnetic flux, leading to severe overheating or even burnout of transformers.
2. Hazards to distribution switch coils and protection
-May cause voltage breakdown in the secondary operation coil.
-It can cause voltage breakdown of the protective instrument circuit board and burn out electronic circuit components.
3. Hazards to instruments and meters
-It will directly cause voltage breakdown and burn out the power module of the instrument.
4. Hazards to electric motors
-It can cause changes in motor excitation, voltage breakdown of motor coil insulation, and ultimately burn out the motor.
2、 Selection scheme for handling high total voltage distortion rate
Many industries believe that high voltage distortion rates are caused by harmonic currents, and that controlling harmonic currents can reduce voltage distortion. Indeed, for the problem of high voltage distortion caused by the load side, the total voltage distortion rate can be reduced and meet the national standard requirements after harmonic control.
2. The development of power electronics has undergone a qualitative change, and most load devices are now equipped with electronic filtering functions. However, the characteristic of electronic filtering is that it can only eliminate harmonic currents of various orders, and at the same time, it will cause an increase in the harmonic values of various voltages fed back to the grid side. The superposition of harmonic voltages of different orders in the power grid causes an increase in the total voltage distortion rate.
3. Many power electronics application sites have reported a problem that under low harmonic current conditions, the proportion of harmonic voltage is high, and the total voltage distortion rate ranges from 6% to 30%, often causing electronic burnout or fault alarms in load equipment.
4. Regarding the issue of high total distortion rate for different voltages,Lite Electric Energy has developed a new type of voltage total distortion elimination stabilizer - DNV voltage total distortion elimination stabilizer.It is a device for eliminating and compensating different voltage harmonics, which can eliminate the total distortion rate of load voltage and the total distortion rate of grid side voltage.