Transformer Testing Instrument
LQHV-S20A Three-Phase DC Resistance Tester
Transform Your Transformer Testing
The LQHV-S20A represents the pinnacle of three-phase DC resistance measurement technology, specifically engineered for:
Complete YN group winding analysis
On-load tap changer assessments without discharge cycles
Field-ready operation with military-grade protection
Product Parameters
Technical parameter
| Measurement model | Single phase(Two phase) | three-phase | |||||||
| current gear | 1A | 5A | 10A | 20A | 40A | 1A | 5A | 10A | 20A |
| Measuring range | 10mΩ～20Ω | 1mΩ～4Ω | 1mΩ～2Ω | 1mΩ～1Ω | 1mΩ～0.5Ω | 10mΩ～6Ω(each phase) | 1mΩ～1Ω(each phase) | 1mΩ～0.6Ω(each phase) | 1mΩ～0.3Ω(each phase) |
| Maximum resolution | 0.1μΩ | ||||||||
| measurement accuracy | ±0.2%（full range）± 2 digital | ||||||||
| Data storage range | 150 group | ||||||||
| power supply | AC 220V±22V，50Hz±2Hz | ||||||||
| work environment | environment temperature：0℃～40℃ Relative humidity ：≤80%RH | ||||||||
Revolutionary Three-Phase Testing
1. Unparalleled Efficiency
66% time reduction vs sequential single-phase tests
Continuous on-load tap changer evaluation
2. Advanced Protection Systems
Automatic current limiting
Overvoltage/overcurrent safeguards
Discharge-free tap switching
3. Field-Optimized Design
7" sunlight-readable LCD with Chinese/English UI
IP54-rated portable casing (4.2kg)
Built-in thermal printer + 2000-test memory
Typical Applications
Power Utilities: Preventive maintenance programs
Transformer OEMs: Factory acceptance testing
Service Teams: Fault diagnosis after short-circuit events
Commissioning: Baseline measurements for new installations
Technical Highlights
Smart Current Output: Auto-adjusts based on winding impedance
Data Integrity: 0.05% typical repeatability
Advanced Diagnostics: Phase imbalance detection algorithms
Future-Ready: USB data export for trend analysis
Why This Tester Stands Out
⚡ No discharge delays between tap positions
📊 Simultaneous three-phase graphs for quick comparison
🛡️ Dual-level protection for equipment safety
📈 Compliance Ready: Meets IEC 60478-1 standards
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