publisher: Alice Yang

Time: 2016-06-14

The wastage of the capacitor is an important index of the capacitor, is an important symbol of measuring capacitor quality, determines the service life of the capacitor and the effect of capacitor in the circuit

Definition: a capacitor in the working process of the capacitor with heat and energy consumption.The energy loss in the capacitor from two aspects: dielectric loss and the loss of metal dielectric loss including 1, medium conductance loss caused by leakage current

2, dielectric polarization caused by polarization loss

The loss of metal including

1, the metal plate in contact with the lead wire resistance loss

2, metal plate resistance produced by the loss

3, lead wire resistance loss

Metal loss increases with the increasing of frequency and temperature, while she was working in a high frequency circuit loss ratio of the loss of metal will be very high,

On the capacitor applications and production process to pay special attention to this.

Due to the existence of capacitor loss, plus the Angle between the voltage and current in the capacitor 90 degrees (phase Angle) is not ideal, but rather from a delta, the delta Angle is called a capacitor loss Angle (see chart).Habits to loss tangent value of capacitor loss, actually is the capacitor reactive power consumption, so also can define like this:

The wastage of the capacitor and in the case of capacitor under the effect of electric field, the consumption of reactive power and the ratio of the total power consumption

Its expression is: capacitor loss tangent value = reactive power present total power

Or capacitor loss tangent value = reactive power x 100 present (draw) as a percentage of the value of total power

Type in the total power = reactive power + active power

Active power = I active square x xc

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

R = metal plate in contact with the lead wire resistance + metal plate resistance + lead wire resistance

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