The MEXB series variable frequency series resonance consists of a variable frequency power supply, an excitation transformer, a reactor, and a capacitive voltage divider. The capacitance of the test object and the reactor form a series resonance connection; the voltage divider is connected in parallel with the test object to measure the resonance voltage on the test object and serve as an overvoltage protection signal; the frequency-modulated power output is coupled to the series resonance circuit through the excitation transformer to provide the excitation power for the series resonance. The MEXB series variable frequency series resonance applies the principle of series resonance, uses the excitation transformer to excite the series resonance circuit, adjusts the output frequency of the variable frequency controller, so that the loop inductance L and the test object C resonate in series, and the resonance voltage is the voltage applied to the test object. The variable frequency resonance test device is widely used in electric power, metallurgy, petroleum, chemical and other industries, and is suitable for handover and preventive tests of capacitive test objects with large capacity and high voltage. It is small in size and light in weight, very convenient for on-site use and handling (the size and weight are about 1/10 to 1/30 of the traditional test transformer;
4. Unique low harmonic patented technology, the harmonic content measured by Wuhan High Voltage Research Institute is less than 0.3%, far lower than the national standard requirement of no more than 5%, greatly protecting main transformers, generators and other equipment from high-voltage harmonic damage;
5. Passed the strict type test appraisal of the authoritative institution - Wuhan High Voltage Research Institute, ensuring the safety of personnel and equipment; ranked among the top in the 2008 national equipment competition organized by Northeast Electric Power Research Institute;
The series resonance composed of reactor L and test object capacitance C has a fixed resonance frequency F=1/(2π√LC). When the test frequency equals this frequency, the circuit resonates. Use the excitation transformer to excite the series resonance circuit, adjust the output frequency of the variable frequency power supply, so that the loop inductance L and the test object C resonate in series, and the resonance voltage is the voltage applied to the test object.
1. The variable frequency series resonance device should be used by high-voltage test professionals. Before use, read the instruction manual carefully and undergo repeated operation training.
2. There should be no less than 2 operators. When using, strictly abide by the safety operation regulations for high-voltage tests of the unit.
5. When the variable frequency series resonance device is in use, it outputs high voltage or ultra-high voltage, and must be reliably grounded. Pay attention to operation safety.
6. When the machine is turned on and after returning to zero, if the voltage still cannot be raised, press and hold the reset button for a long time (about 10 seconds), and make the indicator lights on the control box panel normal, that is, no other red lights are on except "high voltage", then start normal operation.
The variable frequency series resonance adopts full touch screen operation and display, has test data query and save functions, and the product has comprehensive protection functions, which can realize zero position protection. If the voltage output control button is not at the zero position, the switching components cannot start normally, overload voltage protection, overload current protection, flashover protection, etc., ensuring the safety and reliability of the switching components.
