Power quality is whether the voltage/current/frequency/harmonic and other parameters in the power supply system meet the standard requirement of users. If not, there will be influence to the power grid system and power equipment and leading to instability of power grid system and damage of power equipment. Thus it is meaningful to analyze and improve the power quality in the power grid system.
Main problems in the power grids are as below:
1. Voltage fluctuation and flicker. Voltage fluctuation is the supply voltage fluctuates in a special time, while voltage flicker is the sudden voltage dips and recovery, which may cause lights flash, motor having difficulty to start, computer crash, etc.
2. Voltage dips and voltage interruption. Some incidents in the power grid system, like lightning striking power supply, malfunction in the power equipment, will lead to voltage dips and voltage interruption. It will result in equipment damage, stop working, and even fire disaster.
3. Harmonics and inter-harmonics. Harmonics are the distortion of sine wave in the current or voltage. Inter-harmonics are the harmonics between fundamental wave and DC current. They can lead to power efficiency reduction, equipment overheat, etc.
4. Unbalance. It is the asymmetric flow of the current in the three phases. Long time unbalance will make the transformer and motor premature damaged.
Based on knowing the testing aims, and the conditions of power supply equipment, electric equipment, users can select suitable power quality analyzers with high accuracy, stability and reliability to measure and analyze the parameters in power grid, and then make improvements to the power supply system, such as monitoring the power quality in a certain time, maintaining and repairing the power supply system, updating the configuration of power grid system, etc.
Three model power quality analyzers offered by Suin can be selected to match users' different measuring requirements---SA2100 Class S, SA2200 Class A, economical type SA2300.