What is the Inductance and Capacitance
Jul 29, 2024Leave a message
Inductance
The inductance of conductors and coils impedes current flow in an AC circuit. It is caused by a self-magnetic flux that induces opposition voltages
in conductors when current flows. The opposition voltage also tries to resist any change in current flow. As the source sine wave approaches zero, the
opposing voltage will try to prevent the new direction of current flow and force the current to lag the source voltage. The unit for inductance, the henry
(symbol L), is named after Joseph Henry. When a rate of change of current of 1 amp per second results in an induced voltage of 1 volt, the inductance of the circuit is said to be 1 henry. When current flows and returns in conductors in close proximity, the magnetic flux from the return conductor subtracts from the source conductor flux, which reduces the overall induc tance of the conductors. If the wires are spread apart, the inductance will increase as the subtractive flux weakens. If the wires are wound in a coil, the inductance will increase dramatically, and if wound around iron, much more dramatically.
Capacitance
Capacitance can also impede current flow in an AC circuit. Capacitors store voltage or potential energy, perhaps by moving electrons to a higher orbit,
thereby increasing their potential energy. The stored voltage tries to main tain and/or increase the circuit voltage. As the source sine wave approaches
zero, the stored voltage pushes current in the new direction in advance of the source voltage causing the current to lead the source voltage. The unit for capacitance, the farad (symbol C), is named in honor of Michael Faraday. One farad can store one coulomb (amp-second) of charge at one volt. The coulomb (symbol Q) is named in honor of Charles-Augustin de Coulomb (French) for his work in electrostatic forces in the 1700s. Capacitance is a function of a dielectric constant times the conductive plate areas divided by the distance between plates. The dielectric (insulating materials or air) could be the insulation on wires or cable, and the plates could be composed of the conductor on one side and another conductor or earth ground for the other.
How to measure Inductance and Capacitance
RG-H adopts a new generation of high-speed mixing microprocessors, highly integrated, simultaneously collecting the tested objects' voltage signals and current signals, and automatically calculating the capacitance value, the inductance value, and the reactive power value. Field measurement capacitor without removing the connecting wire, simplifying the testing process, improving efficiency, and avoiding damage to electrical equipment. After the test, automatically calculates each phase capacitance value and other parameters, and can easily distinguish the capacitor quality and connecting conductors faults among components. At the same time, the instrument with data storage and USB communication functions, can
ensure the measuring data integrity.
