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Analysis on tantalum capacitor loss tangent

Source:未來(lái)電子    Author:Admin    Visit:2    Pubtime:2016-10-23 20:51:30

The loss tangent of power capacitor is a capacitor, the actual is not an ideal capacitor, applying AC voltage in the role, in addition to the reactive power Q will output a certain capacity, in the plate internal dielectric capacitors, capacitors (aluminum foil), lead wire conductor, and in the insulator leakage current will have a certain loss of active power P. Usually the P active power capacitor and reactive power ratio called Q for the loss tangent of the capacitor, and expressed by the following equation:

Tan delta =P/Q

Type: Tan 8 - capacitor loss tangent (%);

Active power of P capacitor (W);

Reactive power (Q) of VaR capacitor.

Depth analysis of capacitor loss angle

The loss of capacitor is a very important index of capacitor. It is an important symbol to measure the quality of capacitor, which determines the service life of the capacitor and the effect of the capacitor in the circuit.

Definition: the energy consumed by the capacitor in the process of the operation is called the loss of the capacitor.

The energy loss of capacitor comes from two aspects: dielectric loss and dielectric loss, including 1.

2. Polarization loss caused by dielectric polarization

Metal losses include

1, metal plate and lead out wire contact resistance loss

2, the loss of metal plate resistance

3, lead out the loss of resistance

The metal loss increases with the increase of frequency and temperature, and the ratio of metal loss in high frequency circuit is very high,

Special attention to this point in the application and production process of capacitor.

Because the capacitor loss exists, the angle between the voltage and current of the capacitor (phase angle) is not an ideal 90 degrees, but from a delta, the delta angle is called capacitor loss angle (see below). Used to express the loss angle tangent value of capacitor loss, is the actual reactive power capacitor consumption, so it can be defined:

The loss of capacitor also refers to the ratio of the reactive power consumed by the capacitor under the electric field and the total power consumption.

The expression is: capacitor loss tangent = reactive power, total power

Or the capacitor loss tangent = reactive power and total power of x 100 / (the percentage value)

Total power = reactive power + active power

Active power =I active square * XC

Reactive power =I total square x R= (I drain + I active) square * R

The contact resistance of the R= metal plate and the lead wire and the resistance of the metal plate and the lead wire