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:

tanδ=P/Q

Tan delta =P/Q

式中：tanδ—電容器的損耗角正切（％）；

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

P—電容器的有功功率（W）；

Active power of P capacitor (W);

Q—電容器的無功功率（var）。

Reactive power (Q) of VaR capacitor.

深度分析電容器損耗角

Depth analysis of capacitor loss angle

電容器的損耗是電容器的一個非常重要的指標(biāo)，是衡量電容器品質(zhì)的重要標(biāo)志，決定著電容的使用壽命和電容器在電路中的作用效果

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.

定義：電容器在工作過程因發(fā)熱而消耗的能量叫電容器的損耗。

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

電容器的能量損耗來自兩方面：介質(zhì)損耗與金屬損耗介質(zhì)損耗包括 1、 介質(zhì)漏電流引起的電導(dǎo)損耗

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

2、介質(zhì)極化引起的極化損耗

2. Polarization loss caused by dielectric polarization

金屬損耗包括

Metal losses include

1、 金屬極板與引出線接觸電阻產(chǎn)生的損耗

1, metal plate and lead out wire contact resistance loss

2、金屬極板電阻產(chǎn)生的損耗

2, the loss of metal plate resistance

3、引出線電阻產(chǎn)生的損耗

3, lead out the loss of resistance

金屬損耗隨頻率和溫度的增高而增大，在高頻電路工作時，金屬損耗占的損耗比例會很高，

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

這點在 電容器應(yīng)用及生產(chǎn)工藝上特別注意。

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

由于電容器損耗的存在，使加在電容器的電壓與電流之間的夾角（相位角）不是理想的90度，而是偏離了一個δ度，這個δ角就稱為電容器的損耗角(見下圖）。習(xí)慣上以損耗角正切值表示電容器的損耗，實際就是電容器消耗的無功功率，于是也可以這樣定義：

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:

電容器的損耗也指電容器在電場作用下，消耗的無功功率與消耗的總功率的比值

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.

其表示式為：電容器損耗角正切值=無功功率÷總功率

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

或電容器損耗角正切值=無功功率×100÷總功率(得出的值為百分比）

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

式中， 總功率=無功功率+有功功率

Total power = reactive power + active power

有功功率=I有功平方×xc

Active power =I active square * XC

無功功率=I總平方×R=（I漏 + I有功 ）平方×R

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

R=金屬極板與引出線接觸電阻+金屬極板電阻+引出線電

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