Последовательный резонанс
Типичная
Его основной принцип работы заключается в регулировании частоты источника питания таким образом, чтобы индуктивность L реактора в цепи и ёмкость C испытуемого объекта вошли в
Основные компоненты устройства последовательного резонанса:
2. Возбуждающий трансформатор
Function: Steps up the output voltage from the variable frequency power supply to provide appropriate excitation voltage for the resonant circuit.Role:Electrical Isolation: Isolates the variable frequency power supply from the high-voltage circuit, ensuring safety and noise immunity.Voltage Matching: Its output voltage needs to match the resonant voltage requirements of the reactor and the test object.Characteristics: Usually has multiple taps to select the appropriate voltage ratio for different test requirements.3. Реактор (резонансный высоковольтный реактор)
Function: This is the core component that creates resonance, providing the inductance L.Role: Forms a series resonant circuit with the capacitance C of the test object.Characteristics:Often, multiple reactors are used in series or parallel based on test voltage and current requirements to match different test object capacitances.The reactors are adjustable (by changing series/parallel combinations or internal taps) to achieve the resonance point.4. Емкостной делитель (система измерения высокого напряжения)
Function: Measures the high voltage on the test object and also acts as part of the resonant capacitance.Role:Measurement: Steps down the high voltage to a low-voltage signal via a precise division ratio, which is sent to the variable frequency power supply for display and control.Feedback: Provides the sampling signal for the system’s over-voltage protection.Characteristics: High measurement accuracy and good stability, making it a key component for ensuring accurate test voltage.5. Компенсационный конденсатор (опционально, в зависимости от ситуации)
Function: Used when the capacitance of the test object is very small (e.g., short cable lengths or SF6 circuit breakers), causing the resonant frequency to be too high and exceed the device’s range.Role: Connected in parallel with the test object to increase the total capacitance of the circuit, thereby lowering the resonant frequency so the device can operate within its effective frequency range.