Capacitance and Inductance Tester is a precision measuring instrument specifically used in the fields of power systems and electronic engineering.



Capacitance and Inductance Tester is a precision measuring instrument specifically used in the fields of power systems and electronic engineering. In the power industry, it is mainly used for on-site rapid and accurate measurement of various capacitors (such as shunt compensation capacitors, coupling capacitors) and reactors/inductor coils (such as series reactors, arc suppression coils, transformer windings) parameters including capacitance, inductance, dissipation factor (tanδ), and DC resistance. Given that the current time is 2026, such instruments have become highly intelligent and integrated. The following is a detailed analysis of this instrument: 1. Core Functions and Application Scenarios A. Main Measurement Objects Capacitor Banks: Shunt Capacitors: Used for reactive power compensation, measuring their capacitance value to determine if they have degraded or broken down. Coupling Capacitors/Capacitive Voltage Transformers (CVT): Measure the voltage-dividing capacitance to assess insulation condition. Integrated Capacitors: Internally multiple units in parallel, requiring precise measurement of total capacity and unbalance. Reactors/Inductor Coils: Series Reactors: Used in series with capacitors to suppress harmonics, requiring measurement of inductance and DC resistance. Arc Suppression Coils: Used in neutral grounding systems, measuring inductance value and compensation current. Transformer Windings: Some high-end instruments can indirectly evaluate the inductance characteristics of windings. B. Key Measurement Parameters Capacitance (C): Units μF, nF, pF. Inductance (L): Units H, mH, μH. Dissipation Factor (tanδ / D): Reflects dielectric loss, a key indicator for judging insulation aging or moisture. DC Resistance (R): DC resistance of the coil, used to calculate quality factor (Q value) or judge inter-turn short circuits. Impedance (Z) and Quality Factor (Q). Frequency Characteristics: Some instruments support variable frequency testing (e.g., 45Hz-65Hz) to simulate actual operating conditions or avoid interference. 2. Working Principle Modern capacitance and inductance testers typically use high-precision variable frequency power sources combined with digital sampling technology: Signal Injection: The instrument internally generates a highly stable sinusoidal voltage or current signal (usually with adjustable frequency, such as 50Hz or its multiples/submultiples), injected into the device under test. Synchronous Sampling: Using high-precision A/D converters, synchronously collect the amplitude and phase of voltage and current signals. Vector Calculation: Using Fourier Transform (FFT) or digital filtering algorithms to filter out on-site power frequency interference and harmonics, calculate the fundamental voltage and current phasors. Parameter Calculation: Based on