Quality Metal Film Capacitor Properties

Whether the capacitor manufacturer hopes to produce it, or the electrical industry wants, the quality of the metal film capacitor is what all manufacturers hope to have. The dielectric strength is the large peak voltage that the capacitor can withstand at the rated room temperature. It can be measured by applying a voltage of a specified multiple of the rated voltage value through a current limiting resistor of 100 Ω per volt for one minute.

The lifetime of a quality metal film capacitor applies a voltage of a specified voltage to the capacitor at a high rated temperature for 500 or 1,000 hours. The appearance is not damaged and the capacitance value does not change by more than plus or minus five percent. The insulation resistance does not fall to the initial value. At 50% limit, the loss tangent will not exceed the initial limit.

The metal film capacitor is different from the foil film structure in that aluminum is sprayed onto the dielectric film by vacuum deposition to form a capacitor plate, which is smaller in size and lighter in weight than a capacitor made of a separate foil and film layer. The unit Farah has lower cost and self-healing. Although its current capacity is relatively low, smaller size and low cost are particularly attractive in terms of high rated capacitance.

The self-healing property of the metal film capacitor is also required for the quality metal film capacitor. When the medium of the film capacitor has problems or clicks, the metallization coating at the breakdown point or the problem position will be under the action of the arc. The metallization coating instantaneously volatilizes, causing the two poles of the capacitor to form a short circuit again, returning to normal operation, which is why the film capacitor will have self-healing properties.

Quality metal film capacitors provide greater performance, longer life, and more stable operation. They are indispensable capacitors.