What are the three major indicators of power quality?

The three major indicators of power quality include voltage stability, frequency quality, and power loss. ‌‌
Voltage stability: This is a measure of the stability of voltage in the power system during steady and transient states. Voltage stability is crucial for the quality of power supply and the normal operation of electrical equipment. The measurement indicators of voltage stability include voltage fluctuations, voltage deviations, and voltage harmonics. Excessive voltage may damage equipment, while insufficient voltage may affect power transmission efficiency.
Frequency quality: Frequency is a key parameter for measuring the stability of power systems, with a standard frequency of 50/60Hz. Excessive frequency deviation may lead to unstable motor speed, affecting production efficiency and system stability. The measurement indicators of frequency stability include frequency deviation and frequency fluctuation.
Electricity loss: There will be a certain amount of electricity loss during the transmission, conversion, and use of electricity, and the indicator for measuring electricity loss is power factor. The lower the power factor, the higher the energy loss and the lower the efficiency of electrical equipment.
These indicators collectively determine the quality of electrical energy, affecting the stability of the power system and the normal operation of equipment.