GDPQ-300E Power quality Analyzer

GDPQ-300E Power quality Analyzer

General Information

GDPQ300E Power Quality Analyzer is a portable device of testing and analyzing power system operation quality.It monitors and collects data in long running time, also provides harmonic analysis and power quality analysis. Meanwhile, it equips with data analysis software, by which the measure data can be uploaded to PC.


  • ARM and DSP, 16M byte memory.
  • Touch screen, more easy and convenient.
  • Data measure and saving, can be uploaded to PC.
  • Module structure, reasonable design and reliable operation.
  • Easy and convenient software upgrading.
  • Detailed analysis of measure data by power quality data analysis software in PC.

Basic functions

Meter detection functions




Measure three phase voltage, zero line voltage, three phase current, zero line current, frequency.

Harmonic wave measure

Measure up to 50times harmonic wave, results include every time harmonic wave voltage, current amplitude, total distortion rate of voltage harmonic wave, every times voltage harmonic ratio/current harmonic ratio, harmonic frequency spectrogram display.

Power measure

Measure three phase apparent power, active power, reactive power, power factor, three phase electric energy.

Three phase unbalance measure

Measure three phase voltage unbalance, positive sequence, negative sequence, zero sequence voltage; three phase current unbalance and positive sequence, negative sequence, zero sequence current; voltage vector and current vector display.

Surge current

Record up to 40pcs surge current events.


Fluctuation, short time flicker, long time flicker measurement


Record voltage dips and swells, up to 40pcs events.

Monitoring record

Long time record basic(stable)power energy quality parameters, record time interval from 3secs to 30mins adjustable.

Digital oscilloscope

Check voltage/current signal wave form

Each accuracy index for detection functions

Measure range

Measure accuracy




Three phase voltage : 10-700V(effective value)

Three phase current : 0.5-1000A(effective value,1000A current sensor for optional)

Zero line current : 0.5-10A (effective value)

Frequency: 40-70Hz

Voltage: ±0.5%

Current: ±0.5%

Frequency: reading±0.01Hz

Here,we use A phase voltage frequency as measure frequency

Harmonic wave measure

Voltage harmonic: total harmonic 1-50times harmonic wave.

Current harmonic: total harmonic 1-50times harmonic wave.

Voltage harmonic wave: ±0.1(%r)

Current harmonic wave: ±0.05(A)

Frequency measure

Active power: 0.05-700kW

Apparent power: 0.05-700kVA

Reactive power: 0.05-700kVAR

Active power energy: 0.01-10000kWh

Apparent power energy: 0.01-10000kVAh

Reactive power energy: 0.01-10000kVARh

Average power factor: 0.00-1.00

Apparent: reading±50VA

Reactive: reading ±50VAR

Power factor: reading±0.005

Active power energy: reading±0.05kWh

Apparent power energy: reading±0.1kVAh

Reactive power energy: reading±0.1kVARh

Average power factor: reading±0.005

Three phase unbalance

Fundamental voltage: 10-700V(effective value)

Fundamental current: 0.5-1000A(effective value)

Fundamental frequency: 40-70Hz

Phase angle: 0-360degree

Unbalance: 0.0%-100%

Voltage: 0.5%

Current: 0.5%

Frequency: reading±0.01Hz

Phase angle: reading±0.3degree

Voltage unbalance: reading±0.2%

Current unbalance: reading±1%

Here,we use A phase voltage frequency as total measurement frequency

Monitoring record

Record parameters include three phase voltage, three phase current, zero line current, voltage harmonic wave(total harmonic+1-25 times harmonic), current harmonic wave(total harmonic+1-25 times harmonic), three phase unbalance, active power, power factor, fluctuation, flicker

Same as above items

Monitoring time up to 960hours

Dips and swells

Voltage dips and swells and temporary outage

Record up to 40pcs events


Voltage fluctuation quantity: 0.1%-10.0%

Measure error: ≤±5%


Short time flicker, long time flicker

Short time flicker measurement error: ≤±5%

Digital oscilloscope

Three phase voltage, three phase current, zero line voltage and zero line current instant wave form

Max.sampling frequency: 200kHz

Min.sampling frequency: 100Hz

Other technical parameters

Voltage signal input loop:

  • Direct access,input impedance: 1MΩ, 20pF
  • Measure range: voltage effective value 10-700V
  • Peak voltage: 1000V
  • Power consumption: less than 0.5VA/phase

Current input loop:

  • Indirect access
  • Measure range: Current effective value 1A,5A,10A,100A,1000A (select corresponding current sensor)
  • Surge current: 1000A (select 1000A current sensor)
  • Power consumption: Less than 2.0VA/phase
  • Measure signal frequency range: 40Hz-70Hz
  • Display screen: 320*240 color LCD with touch screen
  • Memory storage: 16M byte FLASH
  • Outside storage port: USA( plug in USB disk)
  • Working power supply: Rechargeable Li-battery,5-6hours working time for full charge
  • Power supply: AC100-240V/DC 16.8V-1A power adapter/charger



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