Test cell, temperature control, AC/DC sources and standard capacitor in a single automatic instrument
Automatic tanδ, permittivity & DC resistivity
Insulating oil dielectric loss & resistivity tester
Measures the dielectric dissipation factor (tanδ), relative permittivity and DC resistivity of insulating oil, transformer oil and other insulating liquids.
Description and touch interface
All-in-one architecture
The HZJD-2Z integrates the three-electrode test cell, the temperature controller and sensor, the dielectric-loss bridge, the AC test source, the SF6 standard capacitor, the high-resistance meter and the DC high-voltage source into a single instrument. Measurement is full digital and fully automatic, so any operator, without specialised training, obtains repeatable, storable and printable results.
Touch interface and automatic report
- Guided menu on an 800×480 full-touch colour display, with dedicated keys for settings, test, DataScan and oil drain.
- Automatic test report showing oil-cup capacitance Cx, dielectric loss factor tanδ, relative permittivity εr and DC resistivity ρ, with on-board printing.
- DataScan stores and recalls up to 100 records, each with test temperature, test voltage, tanδ, εr, ρ and the date and time of the test.
- Built-in oil-drain control, with confirmation prompt, to empty the cell without removing it between tests.
Where it is used
- Power transformers and other critical assets.
- Substations and transmission and generation facilities.
- Oil laboratories and acceptance or maintenance testing.
A three-electrode test cell with a 2 mm electrode gap eliminates stray-capacitance and leakage effects on the result.
Measurement workflow and test cell
Six-step automatic measurement
- Load and 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; the data is auto-saved for accurate εr and ρ.
- Fill sample: pour about 40 mL of oil, refit the inner electrode and let bubbles settle for over 15 minutes.
- Automatic test: select tanδ/εr and/or DC resistivity; the instrument completes the test automatically.
- Store and print: results are stored, recalled via DataScan and printed; drain the cell for the next test.
Three-electrode test cell
Compliant with the international standard for this type of cell, the 2 mm gap between the high-voltage and measuring electrodes eliminates the effect of stray capacitance and leakage on the tanδ result. An integrated oil-drain solenoid empties and rinses the cell in place with the sample, without removing it between tests.
| Measu | uring ranges, accuracy and resolution | ||
|---|---|---|---|
| Parameter | Range | Accuracy | Resolution |
| Capacitance | 5 pF - 200 pF | ±(1% of reading + 0.5 pF) | 0.01 pF |
| Relative permittivity | 1.000 - 30.000 | ±1% of reading | 0.001 |
| Dielectric loss factor (tanδ) | 0.00001 - 100 | ±(1% of reading + 0.0001) | 0.00001 |
| DC resistivity | 2.5 MΩ·m - 20 TΩ·m | ±10% of reading | - |
Resolution not published by the manufacturer for DC resistivity.
| 27003, Lugo, Spain C/ María Barbeito, 14 | Contact Contact T [+34] 982 20 99 20 |
|---|---|
| 27003, Lugo, Spain | info@amperis.com | www.amperis.com |
| Test parameters and power supply | |
|---|---|
| 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 |
| Temperature control method | Medium-frequency induction heating, non-contact, with PID control |
| Thermal limiting relay | Stops heating above 120 °C |
| Voltage supply | AC 220 V ±10% |
| Power frequency | 50 Hz / 60 Hz ±1% |
| Power consumption | 100 W |
| Physical data, environment and standards | |
|---|---|
| External dimensions (W×D×H) | 500 × 360 × 420 mm |
| Total weight | 22 kg |
| Ambient temperature | 0 - 40 °C |
| Relative humidity | < 75 % RH |
| Standards and compliance | CE; IEC 60247; ASTM D924; ASTM D1169; GB/T 5654-2007; GB/T 507-2002; DL 429.9-91; DL/T 846.7-2004 |
| Three-electrode test cell and standard capacitor | |
|---|---|
| HV-LV electrode distance | 2 mm |
| Dry-cell capacitance | 60 ± 5 pF |
| Max. test voltage (power frequency) | 2000 V |
| Dry-cell loss | tanδ < 1×10⁻⁴ |
| Liquid capacity (sample volume) | ~40 mL |
| Electrode material | Stainless steel |
| Cell volume | 70 mm (D) × 120 mm (H) |
| Standard capacitor | SF6 gas-filled, three-electrode reference; loss and capacitance independent of ambient temperature and humidity |
Dry-cell (empty-cup) calibration is auto-saved for accurate relative permittivity and DC resistivity calculation.
| Scope of supply | ||
|---|---|---|
| Main engine | 1 | |
| Oil cup | 1 | |
| Oil tube | 1 | |
| Dedicated test cable | 1 | |
| Temperature probe cable | 1 | |
| 50 mL measuring cylinder | 1 | |
| Power line | 1 | |
| Fuse pipe | 2 | |
| Thermal print paper | 2 | |
| Allen wrench (5×30) | 1 | |
| Allen wrench (1.5×15) | 1 | |
| User manual | 1 |
Safety: the instrument must be reliably grounded before use. The protective cover interlocks the heating and high-voltage circuits. During a test, high voltage and high temperature are present: do not touch the test cell, cable or sockets while energised.