The explosion of aluminum electrolytic capacitor is certainly dangerous to people.
Question 2: What industrial oil is in oil-immersed capacitor CZ40, which is not good for human body?
The explosion of aluminum electrolytic capacitor is certainly dangerous to people.
Question 3: Oil-immersed capacitor, some basic knowledge of what oil sounds good. Tianjin wtong now has many brands and varieties of oil-immersed capacitors, including round and vertical (just like vertical electrolytic capacitors). Some are square, which may be the kind you said. But what you should pay attention to is whether it is really soaked in oil. Some oil-immersed capacitors will say paper capacitors, but the capacitors are completely sealed with a metal shell, and there is an obvious seal on the shell (generally it feels like a tin seal bump). This means that this capacitor is an oil-immersed paper dielectric capacitor, some of which are obvious. In general, square green or unpainted (that is, those made directly of aluminum shell) are mostly oil-immersed, as long as there is a sealing opening on the shell (generally at the bottom, next to the terminal or under the side). This is the problem to be considered for cylindrical small capacitors. If you don't indicate that it is oil-immersed, it can be proved that it is oil-immersed, because people didn't think that oil-immersed capacitors were such good things as they are now, so sometimes they don't indicate that they are oil-immersed. Oil-immersed capacitors are characterized by small capacity and high withstand voltage. Generally, the withstand voltage is above volts, and some can be as high as volts. But the capacity is very small. Generally, a piece of capacitance as big as soap will not exceed 8u. Oil-immersed capacitors with very small capacity, such as 0.0 1u and other second-hand capacitors, are mostly bad, so it is not easy to find small capacitance values. On the contrary, I have never encountered a bad oil-immersed capacitor above 0.25u, and the insulating oil of the oil-immersed capacitor is different from that of the oil-immersed transformer. If the insulating oil of oil-immersed transformer is not satisfied, you can hear the sound of "rushing" when you shake it, but the capacitor can't hear it. I have removed the oil-immersed capacitor, and the oil in it is very thick and toxic (some capacitors will be marked with danger on the outside). In large oil-immersed capacitors, AC tags are sometimes used when the withstand voltage is marked. It doesn't matter, you can use it the same. If the AC tag is used, the withstand voltage will be higher when it is used in DC (such as filtering). There are many brands of oil-immersed capacitors at present. Personally, I think the quality of TCC and Dubilier in Britain and Sprague in America is good. There are many American brands of GE capacitors, and the price is relatively cheap. Sprague's capacitor quality is better than GE's, so it would be better if we could go to Black Widow or Itamin in sprague. In addition, there are some second-hand oil-immersed capacitors, such as ERO and RIFA, but it is not easy to see large-capacity ones. We often see long barrel capacitors with GE, which are printed directly without paint. GE's trademark is a round flower logo. It looks like oil immersion and has a sealed mouth, but it is extremely light, so it has never been tried. Domestic oil-immersed capacitors have a huge stock in China. We have never used domestic oil capacitors, so we dare not evaluate their quality. Japan's oil-immersed capacitor, NEC brand, once used 0.47u as the frequency dividing capacitor, and the sound was too slow, which seemed a bit "oily". In Guangzhou, there are many high-quality oil-immersed capacitors, square oil-immersed capacitors produced by WE in the early days, and some very, very old cylindrical vertical capacitors (they look a bit like electrolytic capacitors, the aluminum shell outside is not painted, and the capacitors are generally 6u and 4u, with a diameter of about 30mm and a height of mm), and the seals are mostly made by Dubilier and another British brand (I don't know, so I don't remember). I believe that these things were once designed for civil use, so their appearance is different from that of industrial squares, but now they are rare and more expensive than squares. There is no way to compare which capacitance is better with ordinary instruments, only its capacitance, value and so on can be measured. Among the oil capacitors in my hand, TCC, Dubilier and itamin are better, and the values are around, close to itamin, almost to GE, and probably to. There are some other brands of oil capacitors, which have not been tested because they have little confidence in them. It is not indicated that the Sprague capacitance of itamin is worse than that of itamin, but it is equivalent to TCC. The above is my experience in playing with oil capacitors. I know you are in Guangzhou, and I believe I can help you.
Question 4: What's in the capacitor? Electrolytic capacitor is a kind of medium of capacitor, and the electrolyte coating has polarity, and the positive and negative points cannot be wrong. The capacitor consists of two metal electrodes with an insulating material (medium) sandwiched between them. Characteristics of electrolytic capacitor 1: the capacitance per unit volume is very large, which is dozens to hundreds times larger than other types of capacitors.
Question 5: What is an oil-immersed capacitor? The capacitor can be composed of a core, a shell and an extraction electrode. However, in order to avoid oxidative corrosion and long-term use, some insulating solids or insulating liquids will be filled to prevent the iron core from contacting with external air moisture. Insulating solid is usually epoxy resin, and insulating liquid is usually oil. Oil-immersed capacitors are filled with insulating oil, such as polybutene, silicone oil and castor oil.
Question 6: What oil is in the oil-immersed capacitor? How many kinds of oils are there? What's in the dry capacitor and how many kinds of fillers are there? Thank you very much This is transformer oil. Nothing dry, nothing vacuum.
Question 7: What is the relationship between metal film capacitance and oil-immersed capacitance? Cross? Is it included? What are their structures and characteristics? 130 minutes Usually, the capacitors we see on the circuit board are all metal film capacitors, which are widely used and nothing special.
Oil-immersed capacitors are used in explosion-proof occasions and AC power systems. Because of their different structures and characteristics, they can't replace each other.
Question 8: What is SH in the capacitor? The capacity is 32.5 microfarads and the rated withstand voltage is 900vdc. Note that SH is a self-healing capacitor and a metallized film capacitor. The characteristic of this kind of capacitor is that when a short circuit occurs at a certain point inside the capacitor, the metal coating at that point and a small part of the surrounding film will be burned, which will make this part in an open circuit state and the rest can work normally, thus causing the whole capacitor to explode due to short circuit. 40/85 means that the operating temperature range is-.
Question 9: What's wrong with oil-immersed capacitor inversion? Flat should be no problem. Many high-voltage capacitors are placed horizontally.
Question 10: What is the difference between filling air and oil in the middle of a capacitor? Air is filled in the middle of the capacitor, mainly to make the built-in protection action of the capacitor (pull-off or short-circuit safety) when the capacitor core produces gas during self-healing failure, so that the capacitor finally exits the operation;
Oil filling in the middle of the capacitor: it is mainly used to isolate the capacitor from the air when the self-healing of the capacitor fails and the spark goes out to ensure that the capacitor will not catch fire or explode.