NRDWG series substation grounding resistance tester is suitable for testing the power frequency grounding impedance, contact voltage, step voltage, transfer potential, field surface potential gradient and other power frequency characteristic parameters of various grounding devices, as well as soil resistivity. NRDWG-3A substation grounding resistance tester adopts different frequency anti-interference technology, which can accurately measure the data under the power frequency of 50Hz in a strong interference environment. The test current is small (0～3.0A), which will not cause the potential of the grounding device to be too high during the test. At the same time, it also has a strong anti-interference ability, so it can be measured without power failure.
Overview
(1) The measured power frequency equivalence is good. The test current waveform is sine wave and two frequencies are used for measurement.
(2) Strong anti- interference ability of ground voltage. This instrument adopts the different frequency method to measure and cooperates with modern software and hardware filtering technology so that the instrument has a high anti-interference performance and the test data is stable and reliable. The error caused by 15V power frequency (50Hz) interference voltage is only 0.001Ω.
(3) High precision. It can be used to measure large ground grids with very small ground impedance.
(4) Powerful functions. It can measure all the characteristic parameters of the grounding device specified by the relevant standards. Not only can the ground impedance be measured but also the resistance component and reactance component can be measured.
(5) It has the function of disconnection alarm to avoid wrong measurement.
(6) Simple operation. Full English menu operation direct display of the measurement results and the built-in micro-printer can print the measurement results on-site.
(7) Small wiring labor no need for high current wires.
(8) Small in size light in weight and easy to carry.
NRDWG series substation grounding resistance tester is suitable for testing the power frequency grounding impedance contact voltage step voltage transfer potential field surface potential gradient and other power frequency characteristic parameters of various grounding devices as well as soil resistivity. NRDWG-3A substation grounding resistance tester adopts different frequency anti-interference technology which can accurately measure the data under the power frequency of 50Hz in a strong interference environment. The test current is small (0～3.0A) which will not cause the potential of the grounding device to be too high during the test. At the same time it also has a strong anti-interference ability so it can be measured without power failure.
Models
| Parameter | Model | |
| NRDWG-3A | NRDWG-5A | |
| Impedance measurement range | 0～15Ω | 0～50Ω |
| Resolution | 0.001Ω | |
| Measurement error | ±(reading×1%+0.001Ω) | ±(reading×2%+0.001Ω) |
| Anti- interference ability of ground voltage | The error caused by 15V power frequency interference voltage is only 0.001Ω | Power frequency 50Hz anti-voltage interference capability: 10V |
| Test current waveform | Sine wave | |
| Test current frequency | -- | 45Hz 55Hz dual frequency |
| Output current | 0～3.0A | 0～5.0A |
| Output voltage | 0 ~ 100V | 0 ~ 420V |
| Test cable requirement |
The cross-sectional area of the copper core of the current wire ≥ 1.0 mm2 The cross-sectional area of the copper core of the current wire ≥ 1.5 mm2 |
The cross-sectional area of the copper core of the voltage line ≥ 0.2 mm2 The cross-sectional area of the copper core of the voltage line ≥ 1.0mm2 |
| Power supply | AC220V±10% 50Hz | |
| Working environment: | Temperature: -10℃～50℃; Relative humidity: < 90% | |
| Dimensions | 440mm×350mm×310mm | 440mm×350mm×210mm |
| Weight | Around 6.0kg | Around 18kg |
