EN
GDWR-30A Portable High-Power Variable Frequency Grounding Grid Tester
GDWR-30A portable variable frequency grounding grid tester adopts high-power variable frequency anti-interference technology, designed for measuring grounding resistance, impedance and potential distribution of substation grounding grids. It eliminates industrial frequency interference on-site, delivers stable & precise test data without power cut.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDWR-30A is a high-power, high-precision variable frequency grounding grid tester designed for large-scale grounding grids in 500kV/220kV substations, thermal/hydro power plants, and industrial sites with severe electromagnetic interference. It adopts 12kW high-power output, 1A–50A continuously adjustable test current, and 0–800V adjustable voltage, delivering stable and accurate measurements for low-impedance large grids.
Equipped with DSP high-speed processor and advanced variable frequency (45/50/55/60/65Hz single-frequency; 45/55, 55/65, 47.5/52.5Hz auto dual-frequency) technology, it effectively filters 50Hz power frequency interference, enabling reliable testing in live substations without power outage. The full-touch large LCD provides intuitive graphical operation, while 100 groups of data storage + U disk export + PC software analysis ensures convenient data management. With -15°C~+40°C wide temperature and industrial-grade housing, it is ideal for grounding resistance/impedance, soil resistivity, and conduction impedance testing of large grids.
Specifications
| Parameter | Specification |
| Rated Output Power | 12kW |
| Test Current | 1A–50A continuously adjustable |
| Test Voltage | 0–800V adjustable |
| Output Frequency | Singlefrequency: 45/50/55/60/65Hz；Auto dualfrequency: 45/55, 55/65, 47.5/52.5Hz |
| Impedance/Resistance Range | 0.001Ω–5kΩ |
| Resolution | Grounding impedance: 0.0001Ω；Impedance angle: 0.0001° |
| Accuracy | Grounding impedance: ±(1%×reading+0.002Ω)；Impedance angle: ±(1%×reading+0.02°) |
| Soil Resistivity Range | 0–9999Ω·m |
| Display | Fulltouch large LCD (impedance/resistance/frequency/angle/status) |
| Data Storage | 100 groups；U disk export；PC software analysis |
| Power Supply | Main: AC380V threephase；Auxiliary: AC220V±10% (generator compatible) |
| Operating Temperature | 15°C ~ +40°C；Humidity <80%RH (noncondensing) |
| Dimensions (mm) | Host: 450×350×480；Transformer: 450×350×540 |
| Weight | Host: 20kg；Transformer: 35kg |
| Compliance | DL/T 475, GB/T 17949.1, IEC 610101 CAT IV 600V |
Applications
Core Test Objects
· Substation grounding grids: 110kV–500kV;low-impedance large grids
· Power plant grids: thermal/hydro power plants;main grounding systems
· Industrial grounding: petrochemical, metallurgy, data centers
· Transmission towers: 10kV–500kV tower grounding resistance
· Soil resistivity: for grid design and expansion
· Conduction impedance: between grounding points
Typical Usage Scenarios
· Preventive maintenance: periodic testing of large grounding grids
· Commissioning: new substation/plant grid validation
· Fault diagnosis: grid corrosion, breakage, or high resistance
· Live testing: substation grid testing without power outage
· Design optimization: soil resistivity measurement for grid design
Advantages
12kW High Power + 50A Max Current
Drives low-impedance large grids;stable output in strong EMI → accurate readings for 500kV substations
Variable/Dual-Frequency Anti-Interference
Filters 50Hz interference;works in live substations → no power outage, save time & cost
0.001Ω Ultra-High Resolution
Precise measurement for very low impedance grids → meets strict grid safety standards
Full-Touch LCD + DSP Intelligent Control
Easy operation;fast measurement;data storage/export → improve field efficiency & data management
Wide Temperature + Industrial-Grade Build
Reliable in harsh environments;durable for long-term use → suitable for all climate zones
FAQ
Q: Can it test 500kV substation grids without power outage?
A: Yes. Variable/dual-frequency anti-interference enables live-substation testing.
Q: What’s the minimum impedance it can measure?
A: 0.001Ω;ultra-high resolution for very low impedance large grids.
Q: Does it support soil resistivity measurement?
A: Yes. 0–9999Ω·m range;supports four-pole method for grid design.
Q: Is the operation complicated for field personnel?
A: No. Full-touch LCD + intelligent control;one-key test;no professional training required.
Q: What’s included in the standard package?
A: Host, transformer, test cables (current/voltage), grounding rods, U disk, power cables, carry case, user manual, calibration certificate.
