Variable Frequency Series Resonance AC Withstand Voltage Test Device
Darui Electric recommends
I. Product Features:
1. The frequency-tuned 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 short circuit to ground at high voltage, the system remains intact, and it also has strong overload capacity.
2. Strong automatic tuning function. When the system automatically tunes, it sweeps frequencies from 30Hz to 300Hz, displaying the sweep curve, allowing users to intuitively see the tuning process; after sweeping, the system performs a fine frequency sweep around the initially found resonant frequency within a range of ±5Hz with a resolution of 0.01Hz, and finally locks 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 resonance 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, etc., ensuring the reliability of the system.
II. Technical Parameters:
1. Resonant voltage waveform: sine wave, waveform distortion rate <1.0%
2. Output frequency: 30～300Hz
3. Duty cycle: continuous operation for 60 minutes at full power output
4. Quality factor: 30～80
5. Input power supply: single-phase 380/220V±10%, 50Hz
6. Ambient temperature: -10℃～+50℃
7. Relative humidity: <95%, no condensation
III. Product Introduction:
The frequency-tuned series resonance withstand voltage test device mainly consists of a variable frequency controller, an excitation transformer, high-voltage reactors, and a high-voltage 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 fixed amplitude and frequency 380V or 200V power frequency sine wave AC into a sine wave with adjustable amplitude and frequency, and provide power for the entire equipment. The function of the excitation transformer is to step up the voltage output from the variable frequency power supply to the appropriate 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-tuned 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 60KV, 220KV, and 500KV GIS AC withstand voltage tests. 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.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
