How to Detect Power Quality?
Power supply quality refers to power quality and power supply reliability. If the quality of the power supply is not up to standard, the performance of the electrical equipment will deteriorate. For example, the operating efficiency and power factor of the equipment will decrease, the power loss will increase, and the service life will be shortened. It will make the automatic device or electronic equipment work abnormally; it will reduce the efficiency of the production machinery, and the quality of the produced products will be unqualified. In severe cases, a large number of products will be scrapped, and even equipment or personal safety will be endangered.
Power quality characterizes the pros and cons of power quality, usually power quality includes voltage quality and frequency quality.
(1) Voltage deviation
* 35kV and above and for users with special requirements for voltage quality, the allowable deviation of power supply voltage is ±5%
* The allowable deviation of the three-phase supply voltage of 10kV and below is ±7% of the rated voltage.
* The allowable deviation of the 220V single-phase supply voltage is +7%~-10% of the rated voltage
(2) Voltage fluctuation. In a certain period of time, the phenomenon that the voltage changes sharply and deviates from the rated value is called voltage fluctuation. The rate of voltage change is greater than 1% per second, that is, the voltage changes sharply.
(3) Voltage flicker. The phenomenon that the luminous flux of the electric light source fluctuates sharply and causes visual discomfort to the human eye is called flicker.
(4) Voltage Sine Wave Distortion Rate. Due to the existence of a large number of power supply and consumption equipment with nonlinear impedance characteristics in the power system, the actual voltage waveform deviates from the sine wave. This phenomenon is called voltage sine wave distortion. The degree of voltage waveform distortion is measured by the voltage sine wave distortion rate, also known as the voltage harmonic distortion rate.
(5) Negative sequence voltage coefficient. The negative sequence voltage coefficient is used to express the degree of unbalanced three-phase voltage, usually expressed as a percentage of the ratio of the RMS value of the negative sequence voltage of the three-phase fundamental wave to the RMS value of the rated voltage.
Follow us for more sharing.
We are one of the leading suppliers of single-phase Wi-Fi energy meter, three-phase Wi-Fi energy meter, Wi-Fi wall-mounted energy meter, card prepaid electric meter, etc. For more information, please feel free to contact us.
