Many people don't know what the online power quality monitoring device is or what its function is. The appearance of power quality on-line monitoring device is ordinary, which is a cuboid chassis. Because we don't know its specific function, we will not install power quality on-line monitoring device in power system.

On line power quality monitoring device is just like Fang's blood glucose monitor. Blood glucose monitor is a kind of instrument to measure the blood glucose content of human body. Blood glucose refers to the proportion of glucose in the blood. Blood glucose is a kind of invisible thing, blood glucose will not bring us feelings, but once the blood glucose is too high, it will cause all kinds of complications, and the higher the blood glucose value, the greater the probability of cardiovascular and cerebrovascular complications. So we need a blood glucose monitor, which can monitor the level of blood glucose at any time.

 The online power quality monitoring device also plays a monitoring role in the power system. The online power quality monitoring device is used to monitor the grid frequency, three-phase fundamental voltage, current RMS, fundamental active power, reactive power, power factor, phase, etc.; voltage deviation, frequency deviation, three-phase voltage imbalance, three-phase current imbalance, negative sequence voltage and current Harmonics. Similarly, harmonics can not be felt in the power grid, but harmonics can cause instability of power supply voltage, resulting in transformer overheating, motor burning and other accidents.

So the power quality monitor is also an indispensable equipment in the power system.