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HF-GT-214 Grounding Wire Resistance Tester
This portable Grounding Wire Resistance Tester adopts multi-current output design to precisely test loop resistance of grounding down leads. With high measuring accuracy and strong anti-interference ability, it helps staff check corrosion, fractures and bad contacts for substation grounding safety maintenance.
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Download datasheet (PDF · 307 KB)
The Grounding Wire Resistance Tester is a portable high-precision testing instrument specially developed for power industry grounding maintenance work. It supplies multiple optional DC test currents to measure the loop resistance of grounding down leads, portable grounding short-circuit wires and personal protective earthing wires.
It can efficiently detect hidden faults including joint rusting, contact deterioration and wire breakage caused by long-term outdoor operation. Equipped with LCD display and built-in printing function, the device features high measurement precision, stable repeatability and powerful anti-electromagnetic interference performance, perfectly adapting to complex substation field environments.
Compact structure with a durable aluminum alloy carrying case enables easy transportation and field deployment. Regular tests with this equipment effectively reduce grounding safety risks, avoid equipment outages triggered by lightning strikes and short-circuit faults, and guarantee the secure and stable operation of power grid grounding systems in accordance with national power test standards.
Product Features
- Controlled by a high-speed single-chip microcomputer, the device features high automation and extremely simple operation.
- Adopting advanced power supply technology, it delivers stable output current and high output voltage with fast measurement speed and wide measuring range. It is applicable to tests for portable short-circuit grounding wires and personal protective grounding wires.
- Built-in clock and perpetual calendar; capable of storing up to 20 groups of test data for convenient inquiry anytime.
- Comprehensive protection functions: automatic overheat protection for internal power supply to avoid damage; reverse connection warning for voltage terminals to prevent inaccurate test results caused by wrong wiring.
- Equipped with a 128×64 dot-matrix LCD screen with full Chinese menu display for easy operation.
- Integrated thermal printer supports real-time printing of test results.
- Intelligent power management keeps the instrument running at minimum power consumption, lowering internal heat generation and saving energy.
Technical Specifications of HF-GT-214 Grounding Wire Assembly Resistance Tester
| Item | Technical Specification |
|---|---|
| Output Current | 30A, 40A, 50A (selectable) |
| Output Voltage | ≥ DC 10V |
| Minimum Resolution | 0.1μΩ |
| Measuring Range | 30A gear: 150μΩ ~ 300mΩ 40A gear: 100μΩ ~ 250mΩ 50A gear: 50μΩ ~ 200mΩ |
| Accuracy | 5‰ ± 3 digits |
| Operating Temperature | -20℃ ~ 40℃ |
| Ambient Humidity | ＜ 80% RH, no condensation |
| Power Supply | AC 220V±10%, 50Hz |
Purpose
This Grounding Wire Resistance Tester is specially used to measure loop resistance of portable short-circuit grounding wires and personal safety grounding wires in power systems. It detects joint corrosion, loose contacts and wire breakage faults regularly, ensures excellent conductive performance of grounding assemblies, eliminates grounding hidden dangers, and complies with preventive test specifications for electric safety tools to guarantee safe operation of power substations and staff personal safety.
Packing List: Grounding Wire Resistance Tester
| Serial No. | Item Name | Quantity | Unit | Notes |
|---|---|---|---|---|
| 1 | Tester Main Unit | 1 | Set | HF-GT-214 host machine |
| 2 | High Current Test Cables (Red & Black) | 4 | Pcs | Large-current insulated connecting leads |
| 3 | AC Power Cord | 1 | Piece | For 220V power supply |
| 4 | Thermal Printing Paper Rolls | 2 | Rolls | Spare paper for built-in printer |
| 5 | User Operation Manual | 1 | Book | Chinese & English version |
| 6 | Factory Calibration Certificate | 1 | Copy | Official metering test report |
| 7 | Shockproof Aluminum Alloy Carrying Case | 1 | Piece | Integral packaging for transport & storage |
| 8 | Packing List Document | 1 | Copy | This checklist |
Frequently Asked Questions
1. Main Application Scenarios
This tester is designed for routine preventive tests on portable short-circuit grounding wires and personal protective grounding wires in power stations. It checks internal wire breakage, joint rust and poor contact to guarantee safe grounding performance.
2. Optional Output Current Levels
Three adjustable currents are available: 30A, 40A, 50A. Each current corresponds to an exclusive measuring range to meet different onsite detection demands.
3. Measurement Accuracy & Resolution
Minimum resolution reaches 0.1μΩ; overall accuracy is 5‰ ± 3 digits, which can precisely detect subtle resistance changes of grounding loops.
4. Data Storage & Printing Function
The built-in clock can save up to 20 groups of historical test data for later checking. Equipped with a thermal printer, it supports instant printing of test reports for filing and project acceptance.
5. Built-in Safety Protection Mechanisms
It is fitted with power overheat automatic protection to avoid internal component damage. A reverse connection alarm will pop up if test wires are connected incorrectly, preventing inaccurate measuring results. Intelligent power control reduces internal heat generation continuously.
6. Applicable Working Environment
Operating temperature: -20℃ ~ 40℃; Ambient humidity: below 80% RH with no condensation. It can work stably in most complex outdoor substation environments.
7. Operation Difficulty for Field Staff
Adopted single-chip microcomputer automatic control system, the whole operation process is simplified. The 128×64 dot matrix LCD screen displays all operation menus clearly, easy for technicians to operate quickly without complicated training.
8. Power Supply Specification
Standard AC 220V±10%, 50Hz mains power input. Stable high DC output voltage ensures fast and reliable measurement.
9. Calibration Cycle Requirement
Annual professional calibration by authorized metering departments is advised, to maintain long-term measuring precision and conform to national electric power testing regulations.
10. Portability for Field Use
The complete machine is installed inside a durable shockproof aluminum alloy carrying case, compact in volume, lightweight and convenient for transportation to various onsite testing locations.
FAQ
Q1: What test currents does the HF-GT-214 support?
A1: It offers three selectable DC test currents: 30 A, 40 A and 50 A.
Q2: What is the measuring range of each current gear?
A2: The 30 A gear covers 150 μΩ to 300 mΩ; the 40 A gear covers 100 μΩ to 250 mΩ; the 50 A gear covers 50 μΩ to 200 mΩ.
Q3: What is the minimum resolution?
A3: 0.1 μΩ.
Q4: How accurate is the measurement?
A4: 5‰ ± 3 digits.
Q5: What can the HF-GT-214 measure?
A5: It measures the loop resistance of grounding down leads, portable grounding short-circuit wires and personal protective earthing wires. It detects hidden faults such as joint rusting, contact deterioration and wire breakage caused by long-term outdoor operation.
Q6: Can it print and store test results?
A6: Yes. A built-in thermal printer prints test results in real time, and two spare paper rolls are supplied. The built-in clock and perpetual calendar store up to 20 groups of test data for convenient inquiry at any time.
Q7: What protection functions does it have?
A7: Automatic overheat protection for the internal power supply avoids damage, and a reverse-connection warning on the voltage terminals prevents inaccurate results caused by wrong wiring.
Q8: What are the display, power supply and operating conditions?
A8: A 128×64 dot-matrix LCD with a full Chinese menu. The power supply is AC 220 V ± 10 %, 50 Hz. Operating temperature is −20 ℃ to 40 ℃ with ambient humidity below 80 % RH and no condensation.
Q9: What is included in the delivery, and is it portable?
A9: The complete unit is installed in a durable shockproof aluminium alloy carrying case. The delivery includes the tester main unit, 4 high-current insulated test cables, an AC power cord, 2 rolls of thermal printing paper, a Chinese/English operation manual, a factory calibration certificate and the packing list. Annual professional calibration by an authorised metering department is advised.
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