NRYL series high voltage standard capacitor is designed according to the technical requirements of the national machinery industry standard “JB1811-92 compressed gas standard capacitor”, it is in accordance with international IEC standard. NRYL high voltage standard capacitor is an essential measuring equipment in high voltage laboratory, it has a lot of important functions. During measuring bridge circuit, it as a standard capacitor to measure the capacitance value and dielectric loss angle tanδ of cable, bushing, insulator, transformer, capacitor and insulating material; In voltage divider circuit, due to its low loss and high stability of capacity and voltage, often as a high voltage capacitor for measuring the ratio difference and phase angle difference of voltage transformer. In addition, under certain conditions, it also can be as high voltage coupling capacitor in partial discharge measurement circuit. It has many good characteristics, such as small dielectric loss, extremely stable capacitance and dielectric loss, low impact by environmental temperature, etc. It is widely used in electric power system, scientific research institutions and substation, power stations, metering station and the laboratory.