AFunctional characteristics and parameters of harmonic online monitoring device based on class standards

1、 Functional Features

1、 safe and reliable.Voltage input adopts high voltage isolation moduleThe current input adopts a high-precision current transformer to safely isolate the input signal from the measurement system. Greatly improved the anti-interference ability of the instrument.

2、 Easy to use.Adopting a Chinese interface and simple button operation, it is convenient for users to use.

3、 high precision.comply with national standardsALevel instrument requirements. Reference algorithms are used for harmonics, three-phase unbalance, flicker, and fluctuations without approximate calculations, and high-precision calculations are employedA/D（16 Bit), simultaneous sampling, acquisition rate12.8 kHz.

4、 Strong software functionality.adoptDSP+ARM+CPLDThe kernel, fast processing speed, and rich software functions make the instrument suitable for complex testing and data processing work, greatly improving testing efficiency and level.

5、 communication interface(485, Ethernet port)

6、 Multiple testing parameters.System frequency, grid harmonics, three-phase voltage imbalance, voltage fluctuations 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 power2-The parameters specified in the five national standards for power quality, including the 63rd harmonic and true power factor.

7、 High-capacity storage.The device is built-in512MMemory, to5Store data in minutes and store one year's historical data in a single channel,

8Multiple relay contacts can be provided;

9Using benchmark algorithms for approximate calculations of harmonics, three-phase unbalance, flicker, and fluctuations, with high precisionA/D（16 Bit), simultaneous sampling, acquisition rate12.8 kHz, in compliance with national standardsALevel instrument requirements.

10Backend monitoring and analysis systemsupport：Real time data, waveforms, and spectra are displayed on any line of any monitored substation; Output various functional curves and enable scaling, translation, and comparison of curves; Generate power quality；Automatically output power quality statistical reports, maximum statistical values95% probability value, minimum value, average value.

IItechnical indicators

1、 frequency measurement

Measurement range:45～65Hz, center frequency50HzMeasurement condition: The fundamental component of the signal is not less than80％F.S.

measurementwupoor:≤0.02Hz

2、 Input voltage range:AC10～120VorAC10～400V

3、 Input current range:5A/1A

4、 Fundamental voltage and current amplitude: Fundamental voltage is allowedwupoor≤0.5％F.S.Allowable error of fundamental current≤1％F.S.

5、 Measurement of phase difference between fundamental voltage and currentwuPoor:≤0.5°

6、 Measurement of harmonic voltage contentWu is poor：≤0.1％

7、 Measurement of harmonic current contentwuPoor:≤0.2％

8、 Three phase voltage imbalancewuPoor:≤0.2％

9、Unbalance degree of three-phase current:≤1%；

10、voltage deviationwuPoor:≤0.2％

11、Voltage variationwuPoor:≤0.2％

12、powerwuPoor:≤0.5％

13、FlickerwuPoor:≤5％