Power quality monitoringWhat exactly does the device do?
Power quality mainly includes the quality of voltage, frequency, and waveform. The online monitoring equipment for power quality mainly measures voltage deviation, voltage fluctuation and flicker, frequency deviation, harmonics, voltage asymmetry, imbalance, etc.
Monitoring the reliability of power supply is also one of the important tasks. Power supply reliability refers to the ability of a power supply system to continuously supply electricity, which is an important indicator for assessing the quality of power supply system energy. It reflects the degree to which the power industry meets the national economic energy demand and has become one of the standards for measuring a country's economic development level.

Power supply reliability can be measured by a series of indicators such as power supply reliability rate, average user outage time, average user outage frequency, and equivalent system outage hours; At present, the reliability rate of power supply in general urban areas in China has reached over 3 9s (99.9%), and the average annual power outage time for users does not exceed 8.76 hours; The number of major urban centers has reached over 99.99%, with an average annual power outage time of no more than 53 minutes for users.
       Power quality monitoring deviceMultiple testing parameters:
System frequency, grid harmonics, three-phase voltage imbalance, voltage fluctuation and flicker, voltage deviation, fundamental effective value and true effective value of voltage, fundamental effective value and true effective value of current, fundamental active power, active power, fundamental apparent power, 2-50 harmonics, true power factor, and other parameters specified in the five national standards for power quality.
Mass storage
The online power quality monitoring device has a built-in 512M memory, which stores data in units of 5 minutes. Each channel can continuously store historical data for 4 months.
Technical indicators of power quality monitoring devices
1. Frequency measurement
Measurement range: 45-55Hz, center frequency 50Hz, measurement conditions: signal fundamental component not less than 80% F S
Measurement error: ≤ 0.02Hz
2 Input voltage range: AC10~120V
3 Input current range: 5A
4. Fundamental voltage and current amplitude: allowable error of fundamental voltage ≤ 0.5% F.S; The allowable error of fundamental current is ≤ 1% F S
Measurement error of phase difference between fundamental voltage and current: ≤ 0.5 °
Measurement error of 6 harmonic voltage content: ≤ 0.1%
Measurement error of 7 harmonic current content: ≤ 0.2%
8-phase voltage imbalance error: ≤ 0.2%
9 Voltage deviation error: ≤ 0.2%
10 Voltage variation error: ≤ 0.2%
11 Power deviation: ≤ 5%