Dc System | Battery Test Instrument
LQ1000 DC System Earth Fault Detector
AI-powered live-line grounding fault locator for 24V-220V DC power systems
Technical parameters
| Signal generator | output signal frequency | 2.5Hz |
| signal no-load output voltagee | ±20V±5% | |
| signal voltage amplitude error | <5% | |
| signal short circuit output current | ≤80mA | |
| impact resistance of output port | 400V dc impact | |
| power supply voltage | AC220V±10% | |
| voltage frequency | 50Hz±5% | |
| input insurance | 200mA | |
| maximum power | 3W | |
| volume | 300×270×200mm3 | |
| Signal receiver | signal current detection sensitivity | 0.5mA |
| signal generator impedance | 40KΩ | |
| maximum output current | 2.5 mA | |
| receiver displays | digits0～19 | |
| volume | 210×100×32mm3 | |
| aclamp size | Φ50mm | |
| bclamp size | Φ7mm×9mm | |
| Complete machine | detection maximum ground resistance | 300kΩ |
| ground resistance measurement accuracy | 0～4.5kΩ，error≤0.5kΩ 4.5kΩ～300kΩ，error≤10% | |
| External dimension（ mainframe） | 340*290*140mm3 | |
| Weight （ mainframe） | 3.96kg | |
| External dimension | 390*290*140mm3 | |
| Weight | 2.8kg | |
Operates per: DL/T 856-2021 | IEEE 387 | GB/T 19826 safety standards
Critical Advantages
⚡ Live-Line Detection - No need to disconnect chargers or loads
🧠 AI Positioning - Numerical fault probability display (0-100%)
📶 Anti-Interference - Ignores ≤50μF distributed capacitance
🔋 Portable Operation - 8-hour battery life with fast charging
Fault Detection Workflow
System Connection
Inject 7.5Hz signal via DC bus
No system shutdown required
Branch Scanning
Clamp meter measures current harmonics
AI compares phase/amplitude deviations
Fault Visualization
LCD displays fault probability score
Arrow indicates fault direction
Safety Systems
🛡️ Isolated Signal Injection - ≤5Vrms safety voltage
🛡️ Auto Power Limiter - Prevents system disturbance
🛡️ Double-Insulated Clamp - CAT IV 300V rated
Industry Applications
Power Substations
220V/110V protection circuit faults
Battery bank insulation monitoring
Industrial Plants
48V control system diagnostics
24V instrumentation loops
Fault Types Detected
| Fault Type | Detection Threshold |
|---|---|
| Metallic Ground | <10ω<> |
| Damp Insulation | 10k-100kΩ |
| Intermittent Fault | Pulse detection mode |
Operation Tips
🔍 Pre-Scan - Check system voltage stability (±10%)
🧲 Clamp Position - Encircle single conductor only
📱 Data Logging - Stores 500+ test records
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LQ1000 DC System Earth Fault Detector | Live-Line Ground Fault Locator