Why is the capacitor exploding, it is because of it!

Explosion site 2: aluminum electrolytic capacitor, super pressure explosion

Explosion Scene 3: Super Capacitor Short Circuit

Explosion site 4: high voltage discharge

If the capacitor explodes, its power should not be underestimated. The following is the capacitor explosion test found on the Internet by Yirong.com. I believe that after reading it, it will not be a small capacitor.

So what are the reasons for the capacitor to explode? Let's take a look at it with Xiaobian.

1. Positive and negative poles are reversed

If there is a polarity capacitor, the positive and negative poles are connected to the reverse tantalum capacitor. If the positive and negative poles are connected in reverse, the capacitor is burnt, and the capacitor is exploded.

2, the quality of the capacitor is not off

If the quality of the capacitor is not too good (poor manufacturing process, etc.), it may cause breakdown of the internal components of the capacitor, damage to the insulation of the case, etc., which may cause the explosion of the capacitor (to find the brand capacitor, you can go to the link below to go to: capacitor Search results page).

3, poor sealing and oil leakage

Poor sealing of the assembly casing, causing moisture to enter the interior, may result in a decrease in insulation resistance; or the oil level may drop due to oil leakage, leading to a discharge or component breakdown in the shell direction.

4, internal free and belly

When corona, breakdown discharge and severe freeness occur inside the capacitor, the capacitor will reduce the initial free voltage of the component to the working electric field strength under the action of overvoltage, thereby triggering a series of physical, chemical and electrical effects and accelerating the insulation aging. The gas is decomposed to form a vicious cycle, so that the pressure of the casing increases, causing the outer drum of the tank wall to cause an explosion.

5, damage to the insulation of the outer casing

The high-voltage side lead wire of the capacitor is made of thin steel sheet if the manufacturing process is poor. The edge is not flat with burrs or severely bent, and the tip is prone to corona. Corona will cause oil to decompose, the casing expands, and the oil surface drops to cause breakdown. In addition, when the cover is closed, if the welding time is too long at the corner, the internal insulation is burned and oil and gas are generated, so that the voltage is greatly reduced and damaged.

6, with a charge closing caused by capacitor explosion

The live-on of the capacitor bank of any rated voltage is prohibited. Each time the capacitor bank is reclosed, the capacitor must be discharged for 3 minutes with the switch disconnected. Otherwise, the voltage polarity at the moment of closing may be opposite to the polarity of the residual charge on the capacitor and cause an explosion. For this reason, the capacitor bank with a capacity of 160 kvar or more is generally required to be equipped with an automatic trip device without pressure, and the switch of the capacitor bank is not allowed to be equipped with an automatic reclosing.

7, the temperature is too high, causing the capacitor to explode

If the temperature of the capacitor is too high, the electrolyte inside it rapidly vaporizes and expands, breaking through the outer casing and breaking out. The general causes are as follows: 1 The voltage is too high, causing the breakdown of the capacitor, and the current passing through the capacitor increases rapidly in an instant; 2 the ambient temperature is too high, exceeding the allowable operating temperature of the capacitor, causing the electrolyte to boil; 3 the polarity of the capacitor is reversed.

Why do capacitors explode? I believe everyone should be very clear now and know how to prevent it. If you encounter any problems when purchasing capacitors, resistors, inductors, and diodes, you can contact us at any time.

This article is reproduced from the network, please contact us if you are interested in copyright.