Monday, March 11, 2013

High Voltage Ceramic Capacitors

Definition

High voltage ceramic capacitor, as its name implies, is a capacitor with epoxy resin embedment based on dielectric ceramic as the core materials. With the progress of the times and the development of science and technology, high voltage ceramic capacitor now mainly refers to the capacitor with AC operating voltage above 10KV, or ceramic capacitor with DC operating voltage up to above 40KV. (Usually in the past Y capacitor of 250V and 400V is also divided into high -voltage ceramic capacitor).

Types

According to their purpose and different appearances, high voltage ceramic capacitors can be divided into lead type, bolt type, foot type, AC type, DC type, and high power type high voltage ceramic capacitor. Here both AC and DC capacitors are mainly set out on applications.

1. Civilian DC high voltage ceramic capacitor is mainly applied in machinery equipment detection instrument, such as X-RAY, CT machine, and DC high pressure generator, which are mainly for voltage-multiplying, partial pressure, filter, coupling, as well as carrier. DC high pressure ceramic capacitor will be selected differently due to different occasions. Usually, Y5V and Y5U these low frequency media ceramic capacitors can only be applied on occasions within 1KHZ, mainly works in 50HZ power frequency. Y5T and Y5P II ceramic capacitors can be used at high frequency (30KHZ~100KHZ). N4700 can be used in high-frequency environment in more than 550KHZ. The higher material grade is, the higher frequency range is. For example, NP0, N150, and N750 can be used in above 1GHZ. Civilian DC high voltage ceramic capacitors primarily include the following parameters: voltage classes, capacity classes, temperature coefficients, appearance and size, frequency characteristic, loss factors, insulation resistance, leakage current, as well as the internal resistance. high-voltage ceramic capacitor

2. AC high pressure ceramic capacitor is mainly for the application in work occasions with alternating voltage, such as power detection equipment and national power grid equipment. There are strict high indicators on AC high pressure ceramic capacitors. General they require the following parameters: alternating work voltage, lightning impulse voltage, partial discharge level, rate of temperature change, high frequency characteristics, loss tangent value, voltage linearity characteristic, excess current capacity, insulated resistance, and leak current. Those indicators above are must have indicators for electric power companies to measure whether a capacitor meets requirements or not. In addition, there would be size, coating materials, appearance and other requirements.

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This article is come from:http://www.mobilesaccessories.net/index.php/high-voltage-ceramic-capacitors.htm

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