真空陶瓷高压电容器简介(中英文)

Vacuum Capacitors Introduction1. PreambleOur company has a 30 years experience in manufacturing vacuum capacitors since the former company began in 1970s.We are making about 70 models vacuum capacitors. We have the ability for developing, trial manufacturing and mass-producing.2. How to identify the Vacuum Capacitors2.1 What is vacuum capacitorJust as its name implies, vacuum capacitor is a capacitor with vacuum medium. The plates of the capacitor,which is sealedin a high vacuum container, are series concentric cylinders made by High conductive oxygen free copper. As the cylindersare shaped by series precise mold, vacuum capacitors have reliable performance and hardly bring out arc and electriccorona.2.2. Classification of Vacuum capacitors2.3 How to show the capacitor modelAccording to Chinese standard, the type of vacuum capacitor should be named after the first letter (capital) of the Chinese pronunciation except capacitor, which is denoted by "C". such as vacuum ceramic capacitor:Vacuum ceramiccapacitors Fixed vacuum ceramic capacitors General fixed vacuum ceramic capacitors Adjustable fixed vacuum ceramic capacitors Variable vacuum ceramic capacitors Convection cooling variable vacuum ceramic capacitorsAir cooling variable vacuum ceramic capacitorsWater cooling variable vacuum ceramic capacitorsBy now, adjustable fixed vacuum ceramic capacitors and air cooling variable vacuum ceramic capacitors haven't been made by Chinese company. As China is just on beginning of making water cooling vacuum ceramic capacitors, there is not Chinese standard for the name, we just similarly named the capacitors as the original standard.3. Performance and application of vacuum3.1 Vacuum capacitors are widely used in:z Broadcast communication equipmentVacuum capacitors are used in medium wave, shortwave and ultra shortwave transmitters, act as the tuning, coupling, wave sieving, counteracting component.z Plasma deposition and etching equipment for semiconductor manufacturing.z High frequency industrial equipment for high frequency heating and brazing.z Medical instruments. Medical analysis instruments and treatment instrumentsz High-energy physics. High-energy particle accelerator.z Power equipment. Medium waste test equipment.3.2 Performance of vacuum capacitorsVacuum capacitors have higher withstanding voltage, smaller volume, lower loss and more reliable performance than capacitors with other medium. The particular performance includes the following:Rated voltage-Due to the excellent insulation of vacuum and the dustproof and moistureproof performance, vacuum capacitors have high rated voltage when the dimension and the volume are certain. It can achieve hundreds thousands of voltage.Small loss and high rated current-As vacuum capacitors are made with vacuum medium, low loss ceramic shell and oxygen-free copper plate, it can carry large RF current under general convection cooling, even the frequency is very high. The carrying RF current can achieve thousands of amperes.Save space-to a certain capacitance and rated voltage, vacuum capacitors need smallest space.Wide capacitance range-the ratio of the biggest capacitance to the smallest achieve 150:1, from several pf to thousands of pf, it is an ideal component for wide range tuning.self cured ability for excessive voltage-Vacuum capacitor can withstand instantaneous excessive voltage, which will permanently damage other sort of capacitors.Work in high altitude-vacuum airproof allow vacuum capacitor to work in high altitude without performance decrease.4. Structure of vacuum capacitorsVacuum ceramic capacitors can be separated into two types by the structure.z The plates of the capacitor are fixed, as drawing A, is fixed vacuum ceramic capacitors.z One plate of the capacitor is moveable, as drawing B, is variable vacuum ceramic capacitors.5. Technical parameter of vacuum capacitors1. Top work temperatureTop work temperature of capacitors: 120 °C2. Cooling modeConvection cooling if no special request3. InstallationNo special request.4. Temperature quotietyNo more than 100X10-65. Turning direction for enlarging capacitance of variable capacitorsCounter-clockwise6. CollisionPeak acceleration: 100m /s 2 Pulse duration 16ms; collision times :100007. VibrationVibration direction: determined by the product specification. Frequency range: 5~55Hz.Swing: 20m / s 2 or determined by the product specification. Duration: determined by the product specification.6. Primary technical parameters of vacuum capacitors1. capacitancefixed capacitor: the tolerance is ± 5% when the capacitance is more than 50 pF, the tolerance is ± 10% when the capacitance is 5 to 50 pF.2. peak test voltagePeak test voltage is the maximum voltage (50/60Hz), a capacitor can withstand for one minutes without causing internal or external arcing, through which shows the general condition of a capacitor.3. peak RF working voltage:This is the maximum peak RF voltage that can be continuously applied to a capacitor without reducing the capability of withstanding instantaneous excessive voltage. Usually RF working voltage corresponds to 60%~70% of the peak test voltage, which is the recommend safe data for your selecting capacitors.4. Maximum RF currentMaximum RF current is the RF current permitted to flow the capacitor at working voltage, maximum capacitance and a certain frequency.5. Medium wasteThe medium waste should be than 10x10-4 ,or less6. DC leakage currentDC leakage current is no more than 15uA.7. Turning torque (for variable capacitor)Turning torque should accord with the product specification.7. Cooling method for vacuum capacitorsDifferent cooling methods permit different RF current, there are three types of cooling method:z Convection coolingz Air coolingz Water cooling8. Storage of vacuum capacitorsz Vacuum capacitors should be stored in a vertical position, in a clean, dry place.z Capacitors should take high voltage processing to maintain the voltage hold-off capability when a capacitor is stored more than 3 months.z High voltage processing of water-cooling capacitors should be sure of no water in capacitors.9. Shipping of vacuum capacitorsFor shipping, use the original package whenever possible. Variable capacitors must be kept at minimum capacitance and turn back the turning screw 3~4 cycles.10. Testing of vacuum capacitorsz For AC testing, the AC power should be 50/60Hz, capacitors' ceramic must be free from any vapor, oil or other contaminator to void external breakdown, and variable capacitors should be set to maximum capacitance. Test voltage is the peak working voltage.z For DC testing, capacitors' ceramic must be free from any vapor, oil or other contaminator to void external breakdown, and variable capacitors should be set to maximum capacitance. DC testing is permitted only after capacitors passed AC testing. Test voltage is the peak working voltage. Caution: After DC testing, the capacitor must be completely discharged before next operation. There will bring out some load current after DC testing, it is dangerous.11. Installation of vacuum capacitorsz Before installation, capacitors parameters should get the requirement and be clean.z Cooling method for vacuum capacitor is determined by applied RF current of the capacitor.z One end of capacitor must be connected by soft, short and wide copper strip.z During installation, capacitors should avoid twisting or bending force to prevent distortion of the seal part that connects ceramic and metal.12. Maintenancez Under normal operating conditions, the capacitors do not need much maintenance. They should be free from dust and kept in dry environment. The unglazed ceramic envelope can be cleaned with detergent and clean water.z The lead screw should be periodically lubricated with oil or special grease.Update 2009-9-18 | Copyright © 2009 KunSan GuoLi Vacuum Electric Co.,Ltd | Tel:86-0512-******** | E_mail:info@ | ICP：05019556陶瓷高压真空电容器(Vacuum Capacitors)产品介绍一．前言我们公司前身于 70 年代从零开始试制真空电容器至今，已走过 30 多个年头。