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HF-GT-203 Ground Grid Resistance Testing System
Ground Grid Resistance Testing System is specially developed for substation grounding grid inspection. With dual-frequency anti-interference technology, it measures grounding impedance, soil resistivity, step & contact voltage, supports data storage and onsite thermal printing for power engineering acceptance.
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HF-GT-203 Digital Large-Scale Ground Grid Resistance Tester, also named Substation Ground Resistance Tester / Earth Impedance Tester, is professional equipment for measuring substation grounding grids.
It adopts novel variable-frequency AC power supply, dual-frequency measurement technology, large touch color screen and microprocessor control system, supporting 2-wire, 3-wire and 4-wire testing methods. It can simultaneously measure soil resistivity, step voltage, touch potential, contact voltage and phase angle parameters.
It adopts novel variable-frequency AC power supply, dual-frequency measurement technology, large touch color screen and microprocessor control system, supporting 2-wire, 3-wire and 4-wire testing methods. It can simultaneously measure soil resistivity, step voltage, touch potential, contact voltage and phase angle parameters.
Applicable scenarios: power utilities, electric power stations, meteorological stations, computer rooms, oil fields, power distribution & transmission lines, gas stations, factory grounding grids, lightning arresters. It complies with national standards for substation and lightning protection detection, featuring accurate readings, fast testing, easy operation and stable performance.
Max open-circuit output voltage: AC 400V; Max short-circuit current: 5A. Equipped with microcontroller and automatic dual-frequency technology, it accurately measures power-frequency (50Hz) grounding impedance under strong interference, with readings clearly displayed on the large screen. It can store 100 groups of test data and print records via the built-in thermal printer.
The complete set includes main unit, test leads and auxiliary ground rods, supporting historical data recall, storage and printing functions.
Technical Specifications
| Item | Parameters |
|---|---|
| Functions | Ground resistance, soil resistivity, step voltage, distributed potential, contact voltage measurement |
| Ground Resistance Measuring Range & Accuracy | 0.030Ω ~ 2000Ω: Error ±2%rdg ±5dgt 0 ~ 20.00Ω: ±2%rdg ±5dgt 0 ~ 200.0Ω: ±2%rdg ±5dgt 0 ~ 2000Ω: ±2%rdg ±5dgt |
| Resolution of Ground Resistance | 0.001Ω |
| Rated Measuring Power | 2000W |
| Anti-interference Capacity | Resists 50Hz power frequency interference voltage up to 50V |
| Reference Conditions | 23℃±5℃, relative humidity ≤70%RH; auxiliary ground resistance ≤10%, earth voltage ＜10V |
| Power Supply | AC 220V 10A (50Hz) |
| Backlight | Adjustable brightness |
| Measuring Modes | 4-pole method, 3-pole method, 2-pole method |
| Measuring Principle | Ground impedance: constant current method |
| Short-circuit Test Current | 5 adjustable gears: 1A, 2A, 3A, 4A, 5A |
| Electrode Spacing for Soil Resistivity | Adjustable range: 1m ~ 100m |
| Test Frequencies | 45Hz, 55Hz; automatic dual-frequency switching optional |
| Max Short-circuit Current | AC 5A±10%, sine wave |
| Max No-load Voltage | AC 400V±10%, sine wave |
| Display | 7-inch touch color screen |
| Touch Screen | Equipped |
| Measurement Indication | Progress bar display & animation prompt during testing |
| Overall Dimensions | 540mm × 440mm × 210mm |
| Standard Test Leads | Red 15m, Black 15m, Yellow 10m, Green 10m, Yellow 1.5m, Green 1.5m, 1 piece each |
| Auxiliary Ground Rods | 2 pcs of 800mm + 2 pcs of 2000mm |
| Measuring Time | Approx. 1 minute per ground impedance test |
| Printing Function | Built-in thermal printer |
| Printing Paper Size | 57*40mm |
| Data Storage | 100 groups; “Saved Successfully” prompt; “Memory Full” symbol when storage is full |
| Data Query | Supported |
| Over-range Display | “OL” symbol for over-range indication |
| Auto Power Off | Not available |
| Power Consumption | Standby: ＜110W Measuring: 2000W |
| Weight | Main instrument: 27 kg Test leads + ground rods + packing case: 5.5 kg |
| Operating Temperature & Humidity | -10℃ ~ 40℃, relative humidity ＜80%RH |
| Storage Temperature & Humidity | -20℃ ~ 60℃, relative humidity ＜70%RH |
| Insulation Resistance | ≥10MΩ (500V applied between circuit and enclosure) |
| Withstand Voltage | AC 3700V rms (between circuit and enclosure) |
| EMC Performance | Complies with IEC61010-4-3, radiated electromagnetic field ≤1V/m |
| Applicable Safety Standards | IEC61010-1, IEC61010-2-31, IEC61557-1, IEC60529 (IP54), Pollution Degree 2, CAT III 300V |
Packing List
| Serial No. | Item Description | Quantity | Unit | Remarks |
|---|---|---|---|---|
| 1 | Main Tester Unit | 1 | Set | 7-inch touch color screen, built-in thermal printer |
| 2 | Complete Set of Test Cables | 1 | Set | Red/Black/Yellow/Green leads in various lengths |
| 3 | Auxiliary Earth Rods | 4 | Pcs | 2 pcs × 800mm, 2 pcs × 2000mm |
| 4 | Thermal Printing Paper Rolls | 2 | Rolls | Size: 57×40mm |
| 5 | Power Cord | 1 | Pc | AC220V power supply cable |
| 6 | Operation Manual (English Version) | 1 | Copy | Detailed operation & parameter introduction |
| 7 | Factory Calibration Certificate | 1 | Copy | Official calibration document |
| 8 | Shockproof Transport Case | 1 | Pc | For overall storage and transportation |
FAQ: Ground Grid Resistance Testing System
1. What grounding parameters can this system measure?
It can test ground resistance, soil resistivity, step voltage, touch voltage and potential distribution. It supports 2-wire, 3-wire and 4-wire measuring modes for large substation grounding grids.
2. How does the device resist strong on-site power frequency interference?
It adopts dual-frequency measurement (45Hz/55Hz optional) and variable-frequency AC power supply technology, effectively filtering 50Hz industrial interference to obtain accurate 50Hz power-frequency grounding impedance values.
3. What are the maximum output voltage and short-circuit current?
Max open-circuit voltage is AC 400V, maximum short-circuit current reaches 5A with five adjustable current gears (1A~5A) to fit various grounding grid conditions.
4. Does it support on-site data printing and storage?
It stores up to 100 groups of test data. Equipped with a built-in thermal printer, users can instantly print test reports on site; it also supports historical data viewing.
5. What kind of display screen is configured?
7-inch touch color screen is adopted, with measurement progress animation prompts and adjustable backlight brightness for easy reading in dark outdoor environments.
6. What is the power supply requirement?
The instrument works on AC 220V 50Hz mains power, rated measurement power is 2000W, suitable for long-time continuous field testing.
7. What auxiliary accessories are included in standard delivery?
Complete test leads, 4 auxiliary ground rods, printing paper rolls, power cord, user manual and factory calibration certificate, together with a shockproof carrying case.
8. How long does one complete grounding impedance measurement take?
Approximately 1 minute for each grounding impedance test, stable and reliable for large grounding grid acceptance inspection.
9. Is the instrument compliant with international safety standards?
It complies with IEC61010, IEC61557 and IP54 protection grade, with strict insulation and withstand voltage design to guarantee high-voltage field operation safety.
10. Where is this testing system widely applied?
Mainly used for grounding grid acceptance and maintenance of power substations, power transmission lines, oil fields, gas stations, meteorological stations and industrial factory earthing systems.
11. Can users set the electrode spacing freely?
Yes, the soil resistivity electrode spacing can be manually set within the range of 1m to 100m according to field testing demands.
12. What are the overall weight and environmental adaptability?
Main unit weighs 27kg, total packed weight 32.5kg. It works stably at -10℃~40℃, adapting to harsh outdoor construction environments.
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