Power Testing Instruments
GD-210 Large Ground-Grid Resistance Tester (Type CA)
Dedicated instrument for measuring the grounding resistance of large earth grids and the continuity between grounding points. Uses variable-frequency anti-interference technology, so it needs no high-current supply and can take accurate readings even inside a strongly interfering substation environment.
Overview
Dedicated instrument for measuring the grounding resistance of large earth grids and the continuity between grounding points. Uses variable-frequency anti-interference technology, so it needs no high-current supply and can take accurate readings even inside a strongly interfering substation environment.
Application Scenarios
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Get a QuoteDetailed Description
Overview: the GD-210 is a dedicated instrument for measuring the grounding resistance of earth grids and the grounding continuity between grid points. It adopts a variable-frequency AC supply and a microcomputer-controlled measurement and signal-processing scheme, which solves the anti-interference problem, simplifies the test procedure and greatly reduces labour intensity and testing cost.
Measurement capability: the instrument measures grounding impedance and grounding resistance simultaneously, giving a truer picture of the actual characteristics of the earth grid. It can also measure the current stake, the voltage stake, ground-grid impedance, grounding resistance, grounding continuity and soil resistivity.
Accuracy: the basic error is only 0.005Ω, which allows it to measure very large earth grids with very low grounding impedance. The measurement range is 0-500Ω (including current-stake impedance) with a resolution of 0.001mΩ.
Safety: the instrument is fitted with grounding protection, current-limiting and voltage-limiting protection, and audible and visual alarms to keep both the operator and the equipment safe.
Technical Specifications
| Measurement range | 0-500Ω (including current-stake impedance) |
|---|---|
| Resolution | 0.001mΩ |
| Measurement error | ±(reading x 1% + 0.005Ω) |
| Power-frequency (50 Hz) interference withstand | 10V |
| Test current waveform | Sine wave |
| Maximum output current | 3A |
| Maximum output voltage | 100V |
| Measurement leads | Current lead copper cross-section ≥1.5mm²; voltage lead ≥1.0mm² |
| Power supply | AC220V±10%, 50Hz |
| Dimensions | 368x268x211 mm |
| Weight | 6kg |
Frequently Asked Questions
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