The main parameters and characteristics of safety capacitor forming machine

Time:2022-09-13


GeneralSafety Capacitor Forming MachineDivided into different grades, according to the application of choice. At low ambient temperature and rated ambient temperature, the effective value of the DC voltage that can be continuously applied by the safety gauge capacitor forming machine is generally directly marked on the shell of the safety gauge capacitor forming machine. If the working voltage exceeds the withstand voltage of the safety capacitor forming machine, the capacitor will break down, causing long-term damage that cannot be repaired.

Under the action of capacitive electric field, the energy consumed by heating per unit time is called loss. All kinds of capacitors in a certain frequency range are specified its allowable loss value. The loss of the safety capacitor forming machine is mainly caused by the dielectric loss, conduction loss and resistance of all metal parts of the capacitor.

安规电容成型机的主要参数和特性

Under the action of DC electric field, the loss of the capacitor exists in the form of leakage loss, which is generally small. Under the action of alternating electric field, the loss of the capacitor is not only related to the leakage.

Capacitive leakage refers to a small current that flows through a dielectric when a voltage is applied. Although the model shows a simple insulation resistance Rp in parallel with the capacitor, in fact, the leakage is not linearly related to the voltage. Manufacturers usually specify leakage as the product of Mω-μF, which describes the self-discharge time constant of the dielectric, measured in seconds. From less than 1 second to hundreds of seconds, the former is an aluminum tantalum capacitor, and the latter is a ceramic capacitor. For these devices, surface contamination of the device enclosure or associated wiring and physical components can create leak paths that extend well beyond the media leak.

Safety Capacitor Forming MachineManufacturers often use impedance versus frequency diagrams to illustrate effective series inductance. As expected, the numbers will show at low frequencies, and the device mainly exhibits capacitive reactance. At higher frequencies, the impedance rises due to the series inductance.

The dissipation factor typically varies with temperature and frequency. Capacitors made of mica and glass dielectrics typically have DF values between 0.03 and 1.0 percent.

The resistance that blocks an alternating current of a particular frequency is called impedance (Z). It is closely related to the capacitance value and inductance value in the equivalent circuit of the safety capacitor forming machine, and also related to ESR.

The capacitive reactance (XC) of the safety capacitor molding machine gradually decreases with the increase of frequency in the low frequency range. When the frequency continues to rise to the intermediate frequency range, the reactance (XL) decreases to the ESR value. When the frequency reaches the high frequency range, the inductive reactance (XL) dominates, so the impedance increases with the frequency.

Safety Capacitor Forming MachineThe dielectric has a great blocking effect on the DC current. However, since the aluminum oxide film is immersed in the electrolytic solution, when a voltage is applied, a small current called a leakage current is generated at the time of reforming and repairing the oxide film. In general, the leakage current increases with increasing temperature and voltage.



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