Ultrahigh-voltage coaxial thin-film capacitor, parallel capacitor device and application in high-energy electric pulse energy storage equipment

Abstract

The invention relates to the technical field of high-energy electric pulse energy storage capacitors, in particular to an ultrahigh-voltage coaxial thin-film capacitor, a parallel capacitor device and application of the ultrahigh-voltage coaxial thin-film capacitor and the parallel capacitor device in high-energy electric pulse energy storage equipment. The coaxial capacitor comprises a metal shell, a conductive shaft core and a capacitor body, wherein the conductive shaft core is coaxially arranged inside the metal shell, the capacitor body comprises two layers of film substrates, the surfaces of the two layers of film substrates are respectively provided with a surface conductive layer, a cylindrical shape is formed by winding the two layers of film substrates, the cylindrical shape is arranged in a cylindrical cavity formed by the conductive shaft core and the metal shell, an anode end face conductive layer and a cathode end face conductive layer are arranged and are respectively connected with the two layers of surface conductive layers to form an anode and a cathode of the capacitor body, one end of the anode is connected with the conductive shaft core, and one end of the cathode is connected with the metal shell. The capacitor is resistant to high voltage and high temperature, rapid charging and discharging can be achieved, further, the distributed inductance loss can be greatly reduced by splicing a plurality of capacitors, and then generation of high-energy and high-power supply electric pulses is achieved in underground fluid.

Description

technical field [0001] The invention relates to the technical field of high-energy electric pulse energy storage capacitors, in particular to an ultra-high voltage coaxial film capacitor and a parallel capacitor device and its application in high-energy electric pulse energy storage equipment, and in particular to a high-energy electric pulse capacitor for oil and gas downhole operations. Pulse energy storage device. Background technique [0002] In the underground high-energy electric pulse generator energy storage device used in the development of underground resources, the total energy of the capacitor is U 2 ×C / 2, so the important parameters that restrict the charging time and pulse energy are voltage and capacitance, and the inductance of the entire charging and discharging circuit also has a direct impact on charging efficiency, discharging time and power. In practical engineering applications, more discharge energy and higher power are often required, which requires ...

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Problems solved by technology

[0005] However, the above-mentioned coaxial pulse generator also has the following defects: 1. The single capacitance of the cylindrical capacitor is a parallel capacitor, and the energy storage is limited; Adding the connection structure between the metal shrapnel and the inner wall of the metal outer cylinder increases the production cost and reduces the reliability of the connection. Once the metal outer cylinder is determined, no more capacitors can be added, which is not conducive to the replacement and increase or decrease of capacitors; 3. In order to protect Discharge switch, a current limiting resistor unit is set at the rear end of the energy storage unit, which also limits the discharge current and is not conducive to the improvement of discharge power

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