Main Features
1. Has positive/reverse wiring working modes.
2. Only needs a standard oil cup and dedicated test leads to achieve oil dielectric loss measurement.
3. Uses frequency conversion technology to eliminate on-site power frequency interference, ensuring reliable data even in strong electromagnetic interference environments.
4. Overcurrent protection function prevents damage to the instrument in case of short circuit or breakdown of the test object.
5. Built-in standard capacitor and high-voltage power supply facilitate on-site testing and reduce on-site wiring.
6. Large LCD screen with Chinese menu prompts for the test process, making it intuitive and easy to operate.
Working Principle
Under the action of AC voltage, the dielectric consumes part of the electrical energy, which is converted into heat energy causing loss. This energy loss is called dielectric loss. When AC voltage is applied to the dielectric, there is a phase angle difference Ψ between the voltage and current in the dielectric. The complementary angle δ of Ψ is called the dielectric loss angle, and the tangent of δ, tgδ, is called the dielectric loss tangent. The tgδ value is a parameter used to measure dielectric loss. The instrument's measurement circuit includes a standard circuit (Cn) and a test circuit (Cx). The standard circuit consists of a built-in high-stability standard capacitor and the measurement circuit, while the test circuit consists of the test object and the measurement circuit. The measurement circuit is composed of a sampling resistor, a preamplifier, and an A/D converter. Through the measurement circuit, the amplitudes and phases of the standard circuit current and the test circuit current are respectively measured, and then using a microcontroller with digital real-time acquisition methods and vector operations, the capacitance value and dielectric loss tangent of the test object can be obtained.
The instrument has built-in anti-interference measures to ensure accurate measurement under external electric field interference.
