Power quality monitoring仪Hazards of power quality:

1The harm of harmonics to electrical equipment mainly manifests as follows:The main impact of harmonics on rotating motors is to cause additional losses，Secondly, it generates mechanical vibration, noise, and harmonic overvoltage。Harmonics increase the loss of power supply transformers，Produce significant sound production。Voltage distortion in the AC power grid may cause unequal triggering pulse intervals for conventional converter control angles，And amplify the voltage distortion of the system through positive feedback，Make the operation of the rectifier unstable；For inverters, continuous commutation failures may occur and they may not function properly，Even damaging commutation equipment。Harmonic effects on cables and parallel compensation capacitorsCommunication interferenceElectricity meteringThe impact of relay protection, automatic devices, and computers.

2Reactive impact will cause the following adverse effects:Causes voltage drops and fluctuations in the power supply bus，Reduced the operational level of electromechanical equipment；Power system power quality monitoring instrumentEditor's introductionWhen the bus voltage at the power supply point fluctuates，This will cause the asynchronous machine load torque of the user to change accordingly，The active power of the input load decreases accordingly，Impact on production and equipment output；Rapid reactive power impact causes bus voltage fluctuations leading to flicker，Irritating to human eyes，Causing interference to TV and computer monitor images。The impact of negative sequence:Causing misoperation of negative sequence starting components in power system relay protection devices；Causing generator and factory asynchronous motor heating and vibration。

3Low power factor will cause the following adverse effects:According to the provisions of the Technical Guidelines for Voltage and Reactive Power in Power Systems，Industrial users of high-voltage power supply and high-voltage power supply equipment, as well as power users with load adjustment voltage devices，The power factor should be greater thanzero point ninemore than。otherwise，Users will be fined for low power factor，Directly affecting the economic benefits of the enterprise。Power system power quality monitoring instrumentLow power factor loads absorb a large amount of reactive power from the system，Increased line losses and transformer losses。Due to the simultaneous passage of active power and a large amount of reactive power through the power supply transformer，Reduced the power supply capacity of the transformer。