bowen@harchin.com
Nanjing Gaodian Electric Power Equipment

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.

GD-210 Large Ground-Grid Resistance Tester (Type CA)

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.

Standards & Compliance

Benchmark standards for this equipment category

Systems in this category are commonly specified against these standards, linked to the issuing body. Final configuration and acceptance criteria follow the standard and edition you nominate.

Application Scenarios

Large earth-grid grounding resistance measurementGrounding continuity testing between grid pointsOn-site substation measurement under strong 50 Hz interferenceSoil resistivity measurement

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Detailed 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 range0-500Ω (including current-stake impedance)
Resolution0.001mΩ
Measurement error±(reading x 1% + 0.005Ω)
Power-frequency (50 Hz) interference withstand10V
Test current waveformSine wave
Maximum output current3A
Maximum output voltage100V
Measurement leadsCurrent lead copper cross-section ≥1.5mm²; voltage lead ≥1.0mm²
Power supplyAC220V±10%, 50Hz
Dimensions368x268x211 mm
Weight6kg

Frequently Asked Questions

What is the GD-210 Large Ground-Grid Resistance Tester used for?
It measures the grounding resistance of large earth grids and the grounding continuity between grounding points. Unlike the traditional power-frequency high-current three-pole method, it uses a variable-frequency AC source and does not need a test current of 30 A or more, so the test equipment stays light and the whole process is much simpler.
What makes it accurate in a live substation?
The instrument uses a variable-frequency (different-frequency) measurement method combined with modern hardware and software filtering. The test current waveform is a sine wave whose frequency is close to power frequency, and it withstands up to 10 V of 50 Hz voltage interference, so readings stay stable and reliable even in strong-interference environments.
How do I get a quotation?
Email your grid size, required range and site conditions to bowen@harchin.com. The instrument is manufactured in our Nanjing facility, so we quote directly from the factory. Pricing depends on configuration, so please send your specification rather than asking for a list price.

Further Reading

Method and selection guides that cover the tests this instrument performs.

Standards & Reference

IEC / IEEE / GB Standards Cross-Reference for High-Voltage Testing

Which standard governs a high-voltage test? This reference maps transformers, CTs and PTs, partial discharge and FRA to their IEC, IEEE and GB/DL documents.

Reviewed by the Application Engineering Team at Nanjing Gaodian Electric Power Equipment

Specifications are taken from the manufacturer’s technical documentation. Final configuration and acceptance criteria follow the standard and edition you nominate — tell us your test list and we will confirm the ratings.

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