Frequency Conversion Series Resonance Withstand Voltage Test Device
It is mainly composed of a variable frequency controller, an excitation transformer, a high-voltage reactor, and a high-voltage divider. The variable frequency controller is divided into two categories: those with 20KW and above are console type, and those below 20KW are portable box type; it consists of a controller and a filter. The main function of the variable frequency controller is to convert the 380V or 200V power frequency sinusoidal AC with fixed amplitude and frequency into a sinusoidal wave with adjustable amplitude and frequency, and provide power for the entire device. The function of the excitation transformer is to boost the voltage output from the variable frequency power supply to a suitable test voltage. The high-voltage reactor L is an important component of the resonant circuit. When the power frequency equals 1/(2π√LCX), it resonates in series with the test object CX.
The frequency conversion series resonance withstand voltage test device is suitable for AC withstand voltage tests of 10KV, 35KV, 110KV, 220KV, and 500KV polyethylene power cables. It is also suitable for AC withstand voltage tests of 60KV, 220KV, and 500KV GIS. Additionally, it is suitable for power frequency withstand voltage tests of large transformers and generator sets, as well as induced withstand voltage tests of power transformers.
1.
The frequency conversion series resonance withstand voltage test device has 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 comprehensive protection functions. After multiple tests of direct high-voltage short circuit to ground, the system remains intact and also has strong overload capacity.
2. The automatic tuning function is powerful. When the system automatically tunes, it sweeps frequencies from 30Hz to 300Hz and displays the sweep curve, allowing users to intuitively see the tuning process. After the sweep is completed, the system performs a fine frequency sweep within ±5Hz of the initially found resonant frequency point with a resolution of 0.01Hz, and finally locks onto the resonant frequency.
3. Supports multiple test modes. The system supports test modes such as "automatic tuning + manual voltage regulation", "automatic tuning + automatic voltage regulation", and "manual tuning + manual voltage regulation". It is recommended to use the "automatic tuning + manual voltage regulation" mode, which can quickly find the resonant point and control the test process through manual voltage regulation, ensuring higher safety.
4. The system has a friendly human-machine interface. Test parameter settings, test control, and test results are displayed on the same screen, which is intuitive and clear, and it has automatic timing and operation prompt functions. Full touch screen operation and display, with test data saving and query functions.
5. Comprehensive protection functions. It has zero-position protection (when the voltage output control knob is not at zero, the system is prohibited from starting), overvoltage protection, overcurrent protection, flashover protection, and other functions, ensuring the reliability of the system.
