By hvhipot 
The structure test and detection device for series resonance (also known as series resonance equipment) consists of a frequency conversion system controller, excitation transformer, high-voltage reactor, high-voltage voltage divider, etc. The technology of variable frequency system controllers can be divided into two categories: desktop control environment for 20KW and above, and portable box type for 20KW and below; It can be composed of a controller and a filter. The main function of a variable frequency controller is to convert 380V or 200V fixed amplitude and fixed frequency power frequency sine waves into sine waves with adjustable amplitude and frequency. And provide a power series resonance for the development of the entire equipment. The function of the excitation transformer is to raise the output voltage of the variable frequency power supply system to a suitable test working voltage. High voltage reactors are an important component of L resonant circuits. When the power frequency is equal to 1/(2 π√ LC X), it resonates in series with the CX of the power supply
Composition: Variable frequency series resonance, excitation transformer, reactor, voltage divider, capacitor, control box
Experimental research object: The frequency conversion technology series resonant structure test and detection device can be applied to the AC withstand voltage test of 10KV, 35KV, 110KV, 220KV, and 500KV polyethylene power system cables. Suitable for AC withstand voltage testing. The resonance test and detection device can be applied to the power frequency withstand voltage test of large transformers and generator units in China; Induction withstand voltage test for power transformers; The grounding resistance is measured.
Research field of resonance technology application: Frequency conversion resonance test and detection device can be widely used in industries such as power, metallurgy, petroleum, and chemical in China. Series resonance test device is mainly suitable for the handover and preventive testing of large capacity, high-voltage capacitive samples
Function:
1. High stability and reliability. The resonant device can use imported power components from China as the core of power conversion, with stable voltage and frequency output. The electromagnetic compatibility design is improved through reasonable protection and management functions. After multiple high-voltage direct to ground short circuit tests, the system still needs to be maintained in good condition for development. At the same time, information system research also has strong overload capacity
2. The automatic tuning function is powerful. When the resonance control device can automatically tune, it scans the frequency from 30Hz to 300Hz and displays the sweep curve, allowing users to intuitively see the tuning quality process between systems; After the frequency sweep is completed, the system needs to find the resonant frequency point based on the preliminary development of the sweep, and perform a fine sweep of the working frequency within its ± 5Hz range with a resolution of 0.01Hz. Finally, we lock in the frequency at which resonance occurs
3. Support the development model of multiple factor experiments. The device supports experimental development modes such as “automatic tuning+manual voltage regulation”, “automatic tuning+automatic voltage regulation”, “manual tuning+manual voltage regulation”, etc. It is recommended that the system use the “automatic tuning+manual voltage regulation” mode, which can quickly analyze and find a resonance point, and also control the experimental research process through manual voltage regulation technology, with higher safety
4. The resonance device has a user-friendly human-machine interface. The experimental design parameters are set, the experimental system is controlled, and the experimental research results are displayed on the same screen, which is intuitive and clear, and has automatic timing and operation risk warning functions. Full touch screen operation and display, with the function of saving and querying experimental research data in the system
5. The protection function is complete. The resonant device needs to have zero position protection (the voltage signal output can be controlled by the knob to prevent the system from fully starting when it is not at zero position), overvoltage protection, overcurrent protection, flashover protection management and other functions to ensure the reliability of the system