Insulating Oil Dielectric Loss & Resistivity Tester
HZJD-2Z Series
Automatic tanδ, permitÝvity & DC resistivity for insulating liquids
Full protection & interlocks Over-voltage, overcurrent and HV short-circuit cut-off with alarms; sensor-fault warnings; 120 °C thermal limiting relay.
- Three-electrode test cell Compliant with International Standard, 2 mm electrode gap — eliminates stray-capacitance and leakage effects on the tanδ result.
- 800×480 full-touch colour LCD Guided menu — any operator runs a complete automatic test without specialised training.
- Integrated oil-drain solenoid Empty and rinse the cell in place with the sample — no need to remove it between tests.
- Automatic storage & printing Built-in real-time clock; up to 100 stored records with on-board DataScan recall and thermal print-out.
- Medium-frequency induction heating Non-contact PID temperature control: even, fast and tightly held within the preset error band (0–125 °C).
- Dry-cell (empty-cup) calibration Auto-saved calibration data for accurate relative permitÝvity and DC resistivity calculation.
- SF6 standard capacitor Gas-filled three-electrode reference; loss and capacitance independent of ambient temperature and humidity for lasting accuracy.
- All-in-one architecture Test cell, temperature control, loss bridge, AC source, standard capacitor, high-resistance meter and DC HV source in one unit.
- AC-DC-AC test supply Immune to mains voltage and frequency fluctuation — the instrument even operates correctly from a generator.
DESCRIPTION
The HZJD-2Z Insulating Oil Dielectric Loss and Resistivity Tester measures the dielectric dissipation factor (tanδ), relative permitÝvity and DC resistivity of insulating oil, transformer oil and other insulating liquids quickly and accurately. Built to the leading international standards for liquid insulating materials, it integrates the test cell, temperature controller and sensor, dielectric-loss bridge, AC test source, SF6 standard capacitor, high-resistance meter and DC high-voltage source into a single instrument. Full digital, fully automatic measurement is driven from an 800×480 full-touch colour display with a guided menu, so any operator — without specialised training — can obtain repeatable, storable and printable results. It is the right choice for power transformers and critical assets, substations, transmission & generation facilities, oil laboratories and acceptance / maintenance testing.
INTELLIGENT TOUCH INTERFACE
MEASUREMENT WORKFLOW
Load & connect
Place the cleaned test cell in the groove and connect the test cable and temperature probe.
Set conditions Define temperature (0– 125°C), AC voltage (500– 2000 V) and DC voltage (0– 500 V).
Dry-cell calibration Run the empty-cup calibration; data is autosaved for accurate εr and ρ.
Fill sample Pour ~40 mL of oil, refit the inner electrode and let bubbles settle >15 min.
Automatic test Select tanδ/εr and/or DC resistivity — the instrument completes the test automatically.
Store & print Results are stored, recalled via DataScan and printed; drain the cell for the next test.
TECHNICAL DATA
| Power & supply | |
|---|---|
| Voltage supply | AC 220 V ±10% |
| Power frequency | 50 Hz / 60 Hz ±1% |
| Power consumption | 100 W |
| MEASURING RANGE | |
| Capacitance | 5 pF – 200 pF |
| Relative permitÝvity | 1.000 – 30.000 |
| Dielectric loss factor (tanδ) | 0.00001 – 100 |
| DC resistivity | 2.5 MΩ·m – 20 TΩ·m |
| MEASURING ACCURACY | |
| Capacitance | ±(1% of reading + 0.5 pF) |
| Relative permitÝvity | ±1% of reading |
| Dielectric dissipation factor | ±(1% of reading + 0.0001) |
| DC resistivity | ±10% of reading |
| RESOLUTION | |
|---|---|
| Capacitance | 0.01 pF |
| Relative permitÝvity | 0.001 |
| Dielectric dissipation factor | 0.00001 |
| TEST PARAMETERS | |
| Test voltage AC (RMS) | 500 – 2000 V, continuously adjustable, 50 Hz |
| Test voltage DC | 0 – 500 V, continuously adjustable |
| Measured temperature range | 0 – 125 °C |
| Temperature measurement error | ±0.5 °C |
| Thermal limiting relay | Stops heating above 120 °C |
| PHYSICAL & ENVIRONMENT | |
| External dimensions (W×D×H) | 500 × 360 × 420 mm |
| Total weight | 22 kg |
| Ambient temperature | 0 – 40 °C |
| Relative humidity | < 75% RH |
STANDARDS & COMPLIANCE
CEIEC 60247ASTM D924ASTM D1169GB/T 5654-2007GB/T 507-2002DL 429.9-91DL/T 846.7-2004
TEST CELL & MEASURING PRINCIPLE
Oil-cup schematic
Oil-cup technical data
HV–LV electrode distance: 2 mm Dry-cell capacitance: 60±5 pF Max test voltage (power freq.): 2000 V Dry-cell loss: tanδ < 1×10⁻⁴ Liquid capacity: ~40 mL Electrode material: stainless steel Cell volume: 70 mm (D) × 120 mm (H)