Quality index of electric energy

Quality index of electric energy

Voltage quality standards: overvoltage and undervoltage affect the safe operation of electrical equipment

frequency:

Rated frequency: 50Hz (Foreign: 50 or 60Hz)

Frequency deviation: ±0.2Hz (≥3000MW system)

±0.5Hz (<3000MW system)

Overseas: ±(0.1~0.2)Hz or ±0.5Hz

Waveform:

Quality standard: sine wave voltage and current

Harmonic Harm and Suppression: It will have a negative impact on the power grid, power equipment, and communications. Such as: increasing line loss, harming capacitors, affecting measurement, and protecting malfunctions.

Harm of low power factor: increase line loss, occupy transformer capacity, occupy line transmission capacity, cause terminal voltage to decrease, etc.

The harm of three-phase imbalance: increase the line loss; the increase of the neutral line current causes the neutral point to shift, causing the voltage to deviate from the phase, affecting the safety of the electrical equipment; reducing the transformer utilization rate and reducing the transformer service life.