Instrumentation overview

In power systems, grounding resistance of large ground screen tests at present, the main use of frequency large current measurement. In order to prevent operation when power-line interference, improve the accuracy of measurements, insulation prevention test rules: power frequency large current test current shall not be less than 30Amps. Thus, heavy lies the test equipment, the testing process complicated, test personnel strength, test time, and many other issues.

YDW-5A Large ground network grounding resistance Tester, measurement of substation grounding grid (4Ω), Water power plants, microwave station (10Ω), Lightning (10Ω) Model, used a new type variable-frequency AC power and computer processing control and signal processing, measures have been adopted, very good solving interference problems during testing, simplifies the testing process, increase the precision and accuracy of test results, greatly reduce the cost of testing personnel's labor intensity and test.

The tester is applied to test various types of power-frequency grounding resistance of grounding devices, the contact voltage, voltages, frequency characteristics, such as parameters and soil resistivity. This instrument adopts anti-interference techniques of different frequency, can be accurately measured in strong interference environment 50Hz Under data. Test current 3A, Does not cause ground when testing the potential of the device is too high, and it also has strong anti-jamming ability, so it can be carried out without power measurement.

Performance characteristics

1Measuring frequency equivalent good. Test current waveform for a sine wave, frequency and frequency difference only for 5Hz Use 45Hz And 55Hz Two frequencies were measured.

2, Strong anti-interference ability. This instrument uses the same frequency measurement, combined with modern hardware and software filtering techniques, instruments with very high anti-jamming performance, stable and reliable testing data.

3High accuracy. Basic error 0.005Omega used to measuring the grounding impedance is very large and small networks.

4And powerful. Measuring current, voltage, resistance, voltages, contact voltage.

5And simple operation. Full Chinese menu operation, display measurement results.

6, Cabling, small amount of labor, without high current wires.

Technical specifications

1Impedance measuring range: 1MΩ~ 200Ω

2Resolution: 0.001Ω

3Measurement error: ± (reading x2% +0.005Ω)

4, And frequency 50Hz Voltage noise: 10V

5Test current waveforms: sine wave

6Test current frequency: 45Hz , 55Hz Dual-frequency

7Maximum output current: 5A

8Maximum output voltage: 200V

9Measuring line requirements: current line copper conductor cross section ≥1.5mm2

Voltage line copper conductor cross section ≥1.0mm2

10, Power supply: AC220V ±10% , 50Hz

11Profile dimension: 440×350×210

12Instrument weight: 10kg