LQHV-640 Insulating Oil Dielectric Loss Tester

Precision analyzer for tan δ and DC resistivity of transformer oils with medium-frequency heating technology

Product Parameters

Technical Parameters

Conditions Of Use

Compliant with: GB/T5654-2007 | IEC 60247 | ASTM D924

Key Advantages

• ⚡ 3-Electrode Structure – Eliminates stray capacitance errors (2mm gap precision)

• ⚡ Medium-Frequency Heating – Uniform temperature control (±0.5°C accuracy)

• ⚡ Dual-Parameter Testing – Measures both tan δ (0.0001-1) and resistivity (10⁶-10¹⁶Ω·m)

• ⚡ Lab-to-Field Ready – 15kg portable design with 100-data memory

Testing Workflow

1. Sample Preparation – Oil filtration per IEC 60296

2. Auto-Calibration – Empty cup baseline correction

3. Precise Heating – Ramp to set temp (typically 90°C)

4. Dual Measurement:

• Tan δ at 50Hz AC

• DC resistivity (1kV polarization index)

5. Data Output – Touchscreen display + thermal print

Intelligent Safety Systems

• 🔒 Auto High-Voltage Cutoff – Triggers on open cover detection

• 🔒 Electrode Short-Circuit Protection

• 🔒 Temperature Limiter – Prevents overheating

Diagnostic Applications

Condition Monitoring

• Detects oil oxidation (tan δ > 0.01 indicates aging)

• Identifies moisture ingress (resistivity drop)

Quality Control

• New oil acceptance testing

• Regenerated oil validation

Why Choose LQHV-640?

Maintenance Protocol

• 🧼 Post-Test: Clean electrodes with n-heptane

• 📅 Quarterly: Verify calibration with reference oil

• 💾 Data Backup: Export stored results via USB