Dc System | Battery Test Instrument
LQ-740 Capacitive Voltage Transformer Field Calibrator
All-in-one GIS PT/CVT tester with extrapolation technology for 6kV-220kV systems
Technical parameters
| Environmental condition | Temperature | （5~40）℃ |
| Relative humidity | <80%（25℃） | |
| Sea level | <4500m | |
| Power frequency | 50±0.5Hz | |
| Type of the voltage transformer to be measured | GIS Electromagnetic (PT), Capacitive Voltage Transformer (CVT) | |
| Primary voltage | 6-500kV/√3(Non-standard primary voltage is also acceptable) | |
| Secondary voltage | 100V,100V/√3,110V,110V/√3,100/3V | |
| Accuracy of error measurement | 0.05% | |
| Partial pressure ratio measurement accuracy | 0.5% | |
| Measuring accuracy of partial voltage capacitance | 2% | |
| DC resistance measurement accuracy | 0-0.1Ω | 3% |
| 0.1-50 | 1% | |
| Internal standard voltage transformer section | Ratio range | 6kV/100V、6kV/√3 /100V/√3 |
| 10kV/100V、10kV/√3 /100V/√3 | ||
| 35kV/100V、35kV/√3 /100V/√3 | ||
| 110kV/100V、110kV/√3 /100V/√3 | ||
| 220kV/100V、220kV/√3 /100V/√3 | ||
| 330kV/100V、500kV/√3 /100V/√3 | ||
| Accuracy class | 0.02% | |
| Verification part of the calibrator | Voltage range | 0-100V (dial indicator error 0.5%) |
| Ratio error | 0.001%-3% （100V） | |
| Angular difference | 0.00′-50′（100V） | |
| Error | △X=±(2%×X+2%×Y±2 words) | |
| △Y=±(2%×X+2%×Y±2 words) | ||
| Admittance | 0.1ms-99.9ms | |
| Error | △X=±(2%×X+2%×Y±2 words) | |
| △Y=±(2%×X+2%×Y±2 words) | ||
| Overall dimensions (mm) | 496*394*185 | |
| Weight (kg) | 14.0 | |
Compliant with: JJG 314-2010 | IEC 61869-5 | GB/T 20840.5
Revolutionary Field Testing
⚡ No Heavy Equipment - Eliminates booster/source/load box requirements
📊 Load Extrapolation - Tests at 4kV, calculates 100% load errors
🧠 Multi-Function - Measures ratio/angle differences, capacitance, DC resistance
🖥️ WinCE OS - 10" touchscreen with USB data export
Testing Methodology
Extrapolation Technology
Low-Voltage Test - Apply 4kV max with变频 power supply
Multi-Point Sampling:
20%/50%/80%/100%/120% simulated loads
Light load (25% burden)
AI Calculation:
ε100% = εtest × (Zb/Ztest)
ε=error, Z=impedance
Complete Test Suite
Core Measurements
Ratio difference (0.01-5%)
Phase angle difference (0.1'-60')
CVT capacitance (C1/C2)
Diagnostic Functions
Polarity verification
Wiring check
DC winding resistance
Safety Systems
🛡️ Auto-Discharge - Capacitive circuit protection
🛡️ Overvoltage Limit - Hardwired 4kV cutoff
🛡️ Opto-Isolation - 5kV reinforced isolation
Field Efficiency
| Metric | LQ-740 | Traditional Method |
|---|---|---|
| Equipment Weight | 15kg | 300kg+ |
| Test Time | 8 minutes | 2+ hours |
| Personnel Required | 1-2 | 4-6 |
Smart Data Handling
💾 Export Formats - CSV/PDF via USB
📅 Auto-Reporting - Generates JJG 314-2010 compliant certificates
🔍 Trend Analysis - Tracks historical calibration drift
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