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HF-GT-213 Grounding Down Lead Earth Continuity Tester
This Grounding Down Lead Earth Continuity Tester is specially developed for power system maintenance. It precisely tests the loop resistance of grounding down leads to detect fractures, loose joints and corrosion faults, ensuring smooth current discharge and safe operation of substation grounding networks.
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The grounding down lead continuity tester is a highly automatic portable instrument specially designed for electrical integrity tests of grounding devices. All its technical indicators meet or exceed relevant national standards. Featuring easy operation, high precision, fast testing speed, favorable repeatability and clear readings, it is an ideal instrument complying with industrial regulations, which greatly facilitates testing work and improves working efficiency.
Standard Compliance
This tester conforms to national standards GB6587-86 General Specification for Environmental Tests of Electronic Measuring Instruments and GB6593-86 Verification Regulation for Electronic Measuring Instruments.
Reliable connection between power equipment grounding down leads and grounding grids is the fundamental guarantee for safe equipment operation. After long-term service, joints of grounding down leads may suffer rusting or even fracture due to moisture and other factors. This will increase the contact resistance between down leads and the main grounding grid, failing to meet power industry specifications and bringing potential safety hazards; severe cases will lead to equipment outage. The newly issued Preventive Test Regulation for Electric Safety Tools mandates regular DC resistance tests for portable short-circuit grounding wires and personal protective grounding wires.
Product Technical Parameters
| Item | Technical Specifications | Remarks |
|---|---|---|
| Test Current | 10A / 5A / 1A | – |
| Measuring Range | 10A: 1μΩ ~ 2Ω 5A: 1μΩ ~ 4Ω 1A: 1μΩ ~ 20Ω | – |
| Measurement Accuracy | ±0.2% (Full Scale) | – |
| Display Mode | 128×64 dot matrix LCD display | 4½-digit resistance reading |
| Maximum Resolution | 0.1μΩ | – |
| Power Supply | AC 220V±22V, 50Hz±2Hz | 5A fuse tube equipped |
| Max Power Consumption | 600W | At 10A test current |
| Working Conditions | Ambient temperature: 0℃ ~ 40℃; Relative humidity ≤80% | – |
Product Features
- Measures continuity resistance of grounding down leads for all power equipment inside substations
- Compact size, lightweight and easy to carry outdoors
- Chinese LCD menu interface, intuitive and simple operation
- Fast testing, high accuracy, excellent data repeatability and strong anti-interference performance
Packing List: Grounding Down Lead Earth Continuity Tester
| No. | Item Name | Qty | Unit | Remarks |
|---|---|---|---|---|
| 1 | Main Tester Host | 1 | Set | Built-in display & test circuit |
| 2 | Red Test Cables | 2 | Pcs | High-current insulated connecting wires |
| 3 | Black Test Cables | 2 | Pcs | Return circuit connecting wires |
| 4 | Power Cord | 1 | Pc | AC220V power supply wire |
| 5 | Spare Fuse Tube | 2 | Pcs | 5A spare fuse for replacement |
| 6 | Operation Manual (English+Chinese) | 1 | Book | Detailed operation & maintenance guide |
| 7 | Calibration Certificate | 1 | Copy | Factory metering calibration document |
| 8 | Aluminum Shockproof Carrying Case | 1 | Pc | Integral packaging for transport & storage |
| 9 | Packing List | 1 | Copy | This checklist |
Frequently Asked Questions | Grounding Down Lead Earth Continuity Tester
1. What is the core purpose of this tester?
It measures loop resistance of substation grounding down leads, identifying joint corrosion, loose contact and wire breakage faults to ensure effective conductive connection between power equipment and the grounding grid.
2. What test currents can I choose?
Three optional currents: 1A, 5A and 10A, corresponding to different resistance measurement ranges to satisfy diverse on-site test requirements.
3. What are the precision parameters?
Measurement accuracy: ±0.2% full scale; minimum resolution up to 0.1μΩ, capable of capturing tiny resistance changes accurately.
4. Is it adaptable to complex substation working environments?
Absolutely. It features powerful anti-electromagnetic interference performance. Operating scope: temperature 0℃~40℃, relative humidity ≤80%, ideal for all-year outdoor field maintenance.
5. Can test data be stored and printed out?
The 128×64 dot matrix LCD screen shows readings clearly. The built-in thermal printer outputs standard test reports directly for archiving and project acceptance.
6. Power supply and safety configuration
AC 220V mains input; max power consumption 600W at 10A testing current. A 5A safety fuse is equipped to prevent circuit overload damage.
7. Why carry out regular grounding down lead tests?
After long-time service, connection points tend to rust or crack, which boosts contact resistance. Routine inspections eliminate grounding hazards and avoid equipment shutdown caused by lightning impact and power short circuits.
8. Does the instrument require periodic calibration?
Annual calibration by accredited metrology institutions is recommended, to sustain stable accuracy and make test results compliant with power industry specifications.
9. Is the device convenient for field transportation?
It is assembled inside a sturdy shockproof aluminum alloy carrying case. Compact and lightweight structure enables easy transport to outdoor testing locations.
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