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- Description
- Specifications
- Applications
- Advantages
- FAQ
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Description
The GDHL-200HV Double-Ended Grounding Loop Resistance Tester is a high-current, high-precision micro-ohmmeter engineered for non-disassembly loop resistance measurement on double-ended grounded switchgear (GIS, vacuum/SF6 breakers) and busbar connections. It addresses the critical challenge of grounding grid shunt interference in traditional testers, enabling accurate testing without removing grounding jumpers.
Integrating a high-power constant-current source, precision acquisition unit, and dual Hall-effect current sensors, it delivers 50–200A DC adjustable output (200A max). The 4.7-inch sunlight-readable touchscreen displays resistance, current, voltage, and time simultaneously. Weighing only ~7kg with IP67 protection, it’s ideal for power utilities, GIS manufacturers, and test institutions for efficient, safe on-site maintenance.
Specifications
| Parameter Category | Specification |
| Output Current | |
| DC Current Range | 50/100/150/200A adjustable (200A max) |
| Current Stability | ±0.2% FS |
| Resistance Measurement | |
| Range (50A/100A/150A/200A) | 5μΩ–25mΩ / 5μΩ–10mΩ / 5μΩ–5mΩ / 5μΩ–2mΩ |
| Resolution/Accuracy | 0.01μΩ / ±(0.5% reading + 0.2μΩ) |
| Test Modes | Traditional, clamp direct, single-side shunt, double-side shunt |
| Display & Interface | |
| Screen | 4.7-inch industrial touchscreen (sunlight-readable) |
| Language | Chinese/English bilingual |
| Data Management | |
| Storage Capacity | 1000+ test records |
| Export | USB 2.0 (Excel/PDF); optional thermal printer |
| Power & Environmental | |
| Power Supply | Built-in 14.8V Li-ion battery (8h operation); AC 220V charger |
| Operating Temp/Humidity | -10℃~+50℃, ≤90% RH (non-condensing) |
| Protection Grade | IP67 (dustproof/waterproof) |
| Dimensions/Weight | 350×280×150mm / ~7kg |
| Compliance | DL/T 845.4, GB/T 11022, IEC 62271-1, CE |
Applications
Core Test Objects
· GIS Switchgear: Main circuit resistance, contact condition verification (non-disassembly)
· Vacuum/SF6 Circuit Breakers: Contact resistance, connection quality testing
· Busbars & Connectors: Copper/aluminum bar joint resistance, crimp/weld quality
· Earthing Switches: Contact resistance and electrical integrity check
· High-Current Equipment: Motor stator/rotor connections, transformer bushing contacts
Industry-Specific Usage
· Power Utilities: Substation GIS/breaker commissioning, routine maintenance, fault analysis
· GIS Manufacturers: Factory acceptance testing, quality control, type testing
· Power Generation: Generator outlet breakers, auxiliary switchgear maintenance
· Rail Transit: Traction substation GIS/breaker testing, power supply system maintenance
· Third-Party Labs: Compliance testing, certification, performance verification
Advantages
Non-Disassembly Dual-Ended Grounding Testing
Patented dual-sensor design eliminates grounding grid shunt errors; tests GIS/breakers without removing jumpers—saves 50% test time & 100% safety risk.
200A High-Current True Resistance
200A DC output penetrates contact oxidation films, delivering true metal-to-metal resistance (per DL/T 845.4, ≥100A required).
All-Weather Portable Field Solution
Lightweight (~7kg) with IP67 protection and 8-hour battery—operates reliably in -10℃~+50℃, rain/sun, no external power.
Intelligent & Efficient Workflow
One-click testing, auto-reporting, and voice broadcast—reduces human error by 60%, cuts test time from 30min to 5min.
Global Standard Compliance
Fully compliant with DL/T 845.4, GB/T 11022, IEC 62271-1, CE—test data recognized for grid access and certification.
FAQ
Q: Can it test double-ended grounded GIS without removing jumpers?
A: Yes. Dual-sensor shunt compensation enables accurate testing with both ground jumpers intact.
Q: Why 200A instead of 100A?
A: 200A better penetrates contact oxidation films (DL/T 845.4 requires ≥100A), ensuring true metal resistance readings.
Q: Is it suitable for outdoor substation use?
A: Yes. IP67 protection, wide temperature range (-10℃~+50℃), and sunlight-readable screen support reliable outdoor operation.
Q: How long does a typical test take?
A: 5 seconds max (intelligent fast mode); no jumper removal saves 30+ minutes per test.
