Tag: capacitor

Tantalum (Ta) is a silver-gray metal with the atomic number 73. In the case of solid tantalum capacitors, the electrolyte is added to the anode through pyrolysis. Unlike solid tantalum capacitors, wet tantalum capacitors use liquid electrolytes. We not only know the features of tantalum capacitor, in this article, we ato industrial automation will mainly introduce failure mode of tantalum capacitor.

Ceramic capacitors use ceramic materials with high dielectric constant and low loss as the medium. The silver layer is sprayed on both sides of the ceramic substrate, and then the silver film is fired at high temperature as electrodes to weld the leads. The outer surface is coated with protective enamel or encapsulated with epoxy resin. The capacity is determined by the area and thickness of the ceramic sheet, and the pressure resistance is determined by the thickness of the ceramic.

With the continuous improvement of the function and quality of our electrical products, people are inseparable from them in daily life. As one of the must-have appliances in our home, air conditioners can not only provide us with a comfortable living environment temperature but also help us get through the hot summer. The work of the air conditioner is inseparable from the air conditioner capacitor. How long do air conditioner capacitors last? What's the problem with a bad air conditioner capacitor? These are all things we need to pay attention to.

The appearance of the chip capacitor is made of ceramics. So it is known as multilayer ceramic chip capacitor (MLCC). Multilayer ceramic capacitors are made of parallel ceramic materials and electrode materials. So what are the functions of multilayer ceramic capacitors? The bypass capacitor is an energy storage device that provides energy to the local device. It can make the output of the regulator uniform and reduce the load demand. Like a small rechargeable battery, the bypass capacitor can be charged and discharged to the device.

Electrolytic capacitor is a kind of capacitor, the metal foil is the positive electrode (aluminum or tantalum), the oxide film (aluminum oxide or tantalum pentoxide) close to the positive electrode is the dielectric, and the cathode is made of conductive material and electrolyte (the electrolyte can be liquid or tantalum pentoxide). Solid) and other materials together, because the electrolyte is the main part of the cathode, so the electrolytic capacitor is named.

The main function of the capacitor of the electric fan is that the capacitor and inductor in the electric fan have the function of phase shifting, the terminal voltage of the capacitor is 90 degrees behind the current, and the terminal voltage of the inductor is 90 degrees ahead of the current. First of all, capacitor phase shifting, once the capacitor is energized, the circuit charges the capacitor, and the voltage tends to 0 at the beginning when the charging current is the maximum.

The full name of tantalum capacitor is tantalum electrolytic capacitor, which is a kind of electrolytic capacitor. It uses tantalum metal as the medium instead of electrolyte as common electrolytic capacitor. In this article, we will introduce what tantalum capacitor is, what advantages tantalum electrolytic capacitor has, and the comparison with ceramic capacitor. Tantalum electrolytic capacitors are a subtype of electrolytic capacitors. They are made of tantalum metal that acts as an anode, covered with an oxide that acts as a dielectric, and surrounded by a conductive cathode.

Nowadays, with the development of economy and society and the improvement of science and technology level, electrolytic capacitors and tantalum capacitors have become more and more popular in the daily life of ordinary people, and they are inside the lamps. But at the same time, many people do not understand the difference between them, and even confuse them. So, let's take a look at the difference between tantalum capacitors and electrolytic capacitors today.

Electrolytic capacitor is a kind of capacitor, the metal foil is the positive electrode (aluminum or tantalum), the oxide film (aluminum oxide or tantalum pentoxide) that is close to the positive electrode is the dielectric, and the cathode is made of conductive material, electrolyte (the electrolyte can be liquid or Solid) and other materials together, because the electrolyte is the main part of the cathode, so the electrolytic capacitor is named. At the same time, the positive and negative electrolytic capacitors should not be wrongly connected.

Electrolytic capacitors are capacitors made of an oxide film formed by electrolysis as a medium. The aluminum electrolytic capacitor uses high-purity aluminum as the anode, and a paste composed of ethylene glycol, glycerol, boron and ammonia water as the electrolyte, and electrolysis in the electrolyte produces a very thin layer on the surface of the aluminum. A capacitor made of aluminum oxide film as a dielectric.

The shunt capacitor is mainly used to compensate the reactive power of the inductive load of the power system to improve the power factor, improve the voltage quality and reduce the line loss. Today, in addition to a brief introduction to the main function of shunt capacitors, we mainly introduce the fault judgment and troubleshooting of shunt capacitors.

KWe often hear shunt capacitors and series capacitors in circuit devices. So what is the difference between them? Today, we will introduce the differences between series capacitors and shunt capacitors.

A series capacitor is a reactive power compensation device. Usually series capacitors are used in EHV lines of 330kV and above. Its main function is to improve the system voltage from the perspective of compensating reactance, so as to reduce the power loss and improve the stability of the system. Capacitors must be able to withstand external forces due to short circuits, wind, snow and earthquakes. These mechanical forces are calculated through precise component analysis.

Shunt means parallel. In simple words, the capacitor is connected in parallel with a load or power supply is called shunt capacitor. The series and parallel combination of a no. of shunt capacitors is called shunt capacitor bank. So shunt capacitor is not a special device. It is a normal capacitor only, it is called a shunt capacitor because of its parallel connection with the load. Shunt capacitors are used in transmission lines, power systems, with inductive loads. So AC or non-polarized capacitors are used as shunt capacitors. For DC circuits or DC applications polarized capacitors are used.

As a reactive power compensation device, the capacitor is an important equipment for the safe operation of the power grid. It plays an important role in adjusting the voltage of the power grid, reducing line losses, and improving the quality of power supply. But in actual application, due to the influence of human factors and various aspects of the environment. The capacitor frequently fails during operation, which affects normal operation. The following is an analysis of related failures about capacitance.

ATO provides two categories of capacitors: low voltage shunt power capacitor of the self-healing type (three-phase series) and self-healing low voltage shunt capacitor (single phase, for mineral thermal oven).
Self-healing low voltage shunt power capacitors are used in 50Hz and 6oHz power system. The function of these capacitors contains: reducing reactive power loss, improving voltage quality, enlarging capacity of voltage transformer, etc.
Even though the capacitor’s price varies with its capacity, ATO self-healing three/single phase shunt power capacitors are inexpensive. Here is the price list and welcome to select the best one for you!

Cause of damage of parallel power capacitor

• When cutting off the capacitor bank, restriking overvoltage caused by breaker restrike leads to the insulation damage or breakdown between capacitors. Some capacitor banks don’t have any overvoltage protection measures nor series reactor, particularly, the frequently operated capacitors easily lead to insulation damage or even explosion.
• Too large current over the capacitor and overcurrent caused by overcurrent harmonics in power grid make the capacitor overheated, insulation reduction or even damage.
• The capacitor is not equipped with a single fuse or the fuse characteristics (characteristic aegis of ampere second) are too poor. When the internal components of the capacitor are seriously breakdown and the fault current is generated, the fuse can't fuse in time. Meanwhile, effective protective relaying measures fail to keep up, overcurrent leads to a sharp rise in the temperature inside the capacitor and thereof leads to capacitor expansion or explosion.
• Poor product quality. The paper oil insulation fails to be dried or dipping treatment under a strict vacuum condition, the residual bubbles inside produce partial discharge under the long-term working voltage, while partial discharge further leads to insulation damage and aging. As a result, the temperature also rises, which eventually leads to electrochemical breakdown of components and the capacitor damages.