The Anti-Interference Automatic Dielectric Loss Tester employs variable-frequency power supply technology. By utilizing microcontrollers and advanced electronic circuitry, it achieves automatic frequency conversion, analog-to-digital conversion, and data processing, thereby delivering robust anti-interference capabilities, rapid testing speeds, high measurement accuracy, and user-friendly operation.

The variable-frequency power supply features a high-power switching power module, capable of outputting pure sine waves at single frequencies (45 Hz–65 Hz) as well as dual-frequency combinations (47.5 Hz/52.5 Hz, 45.0 Hz/55.0 Hz, 57.5 Hz/62.5 Hz, and 55.0 Hz/65.0 Hz). It performs automatic voltage boosting and automatically filters out 50 Hz power-frequency interference, making it ideally suited for on-site testing in environments with high electromagnetic interference, such as substations.

Key Features:

1.  **CVT Self-Excitation Testing:** Supports the self-excitation method for Capacitive Voltage Transformers (CVTs), allowing for simultaneous measurement of both C1 and C2 capacitance and dielectric loss (tgδ) with a single wiring setup.

2.  **Reverse Wiring Capabilities:** Features low-voltage shielding and high-voltage shielding functions for reverse wiring configurations; this enables dielectric loss measurements of the C11 section—using the 10 kV reverse wiring method—without the need to disconnect existing wiring, even when the CVT busbar is grounded.

3.  **External Voltage/Capacitor Measurement:** Supports measurement functions utilizing an externally applied voltage source or an externally connected standard capacitor (CN).

4.  **CVT Transformation Ratio Measurement:** Includes a function for measuring the transformation ratio of CVTs, meeting the requirements for CVT devices rated from 35 kV to 500 kV.

5.  **Multi-Channel Simultaneous Measurement:** Capable of simultaneously measuring the dielectric loss values of up to four test specimens.

6.  **Insulation Resistance Testing:** Features an insulation resistance testing mode, allowing for the measurement of Polarization Index (PI), Absorption Ratio (DAR), and insulation resistance values.

7.  **Automatic LCR Measurement:** Provides automatic measurement capabilities for inductance (L), capacitance (C), and resistance (R).

8.  **Variable-Frequency Anti-Interference:** Employs variable-frequency technology to effectively eliminate 50 Hz power-frequency interference present at the test site, ensuring reliable data acquisition even in environments with strong electromagnetic interference.

9.  **Overcurrent Protection:** Equipped with an overcurrent protection mechanism to prevent damage to the instrument in the event of a short circuit or dielectric breakdown of the test specimen.

10. **Integrated Standard Capacitor and HV Source:** Contains a built-in standard capacitor and high-voltage power supply, facilitating convenient on-site testing and minimizing the complexity of field wiring.

11. **Large-Screen LCD Interface:** Features an extra-large LCD screen for clear display and simple operation; the entire testing process is guided via intuitive Chinese-language menu prompts. 12. The instrument's functional interface features corresponding wiring diagrams, greatly facilitating the operator's wiring process.

13. Supports switching between Chinese and English languages.