Characteristics of series resonant system
1. The automatic tuning function is powerful. When the system is automatically tuned, it automatically scans from 30Hz to 300Hz and displays the sweep curve, allowing users to intuitively see the system tuning process; After the frequency sweep is completed, the system performs a fine frequency sweep with a resolution of 0.01Hz within its ± 5Hz range based on the resonance frequency point preliminarily found by the sweep, and finally precisely locks the resonance frequency.
2. Support multiple experimental modes The system supports test modes such as "automatic tuning+manual voltage regulation", "automatic tuning+automatic voltage regulation", "manual tuning+manual voltage regulation", etc. It is recommended to use the "automatic tuning+manual voltage regulation" mode, which can quickly find the resonance point and control the test process through manual voltage regulation, with higher safety.
3. High stability and reliability. The system uses imported power components as the core of power conversion, with stable voltage and frequency output, reasonable electromagnetic compatibility design, and complete protection functions. After multiple high-voltage direct to ground short circuit tests, the system still remains intact, and at the same time, the system also has strong overload force.
4. The protection function is complete Equipped with zero position protection (prohibiting system startup when the voltage output control knob is not in zero position), overvoltage protection, overcurrent protection, flashover protection, and other functions, ensuring the reliability of the system.
5. The system has a user-friendly human-computer interaction interface, with experimental parameter settings, experimental control, and experimental results displayed on the same screen, which is intuitive and clear. It also has automatic timing and operation prompt functions, full touch screen operation and display, and experimental data storage and query functions.
Working principle of series resonant system
Series resonance, as a component of a series resonance system, works similarly in principle. We know that at the circuit frequency, resonance occurs in the circuit, and the voltage on the test sample is Q times the output voltage of the excitation transformer's high voltage end. Q is the system quality factor, which is the voltage resonance multiple, generally ranging from tens to hundreds or more. First, adjust the output frequency of the variable frequency power supply to induce series resonance in the circuit, and then adjust the output voltage of the variable frequency power supply under the condition of circuit resonance to achieve the test value of the sample voltage. Due to the resonance of the circuit, a smaller output voltage of the variable frequency power supply can generate a higher test voltage on the test sample CX.
Advantages of series resonant system (compared to traditional test transformers)
The advantages of a series resonant system mainly include the following:
1. Simple operation, small size, light weight, easy to use and transport on site
2. Good equivalence of the experiment;
3. Comprehensive and reliable protection against overvoltage, overcurrent, discharge, overheating, and zero start, with an action time of 1 microsecond;
4. It has peak monitoring function and can monitor high-voltage test waveforms in real time;
5. One click mouse knob operation, large LCD screen, "foolproof" simple and easy to use;
6. Comes with a micro printer to print and save test data at any time.
Wuhan UHV specializes in producing series resonant cables (also known as series resonant cable withstand voltage) and has been engaged in the electrical measurement industry for many years. Its products have first-class quality and welcome customers to come and purchase.
