Picofarad scale small high voltage no-partial-discharge capacitor

Abstract

The invention provides a picofarad scale small high voltage no-partial-discharge capacitor. A capacitive component is arranged at the central position of an insulating sheath. An insulating dielectric layer is filled between the insulating sheath and the capacitive component. Umbrella skirts are equidistantly arranged on the external surface of the insulating sheath. The center of the side wall of the insulating sheath is provided with a shielding layer. The high voltage end and the low voltage end of the insulating sheath are respectively provided with a seal ring groove. Capacitive chips are fixedly wrapped in an insulating column. The insulating column is also internally provided with a high voltage copper bar and a low voltage copper bar. The high voltage ends of multiple capacitive chips are connected together through the high voltage copper bar to be led to the high voltage end of the insulating sheath, and the low voltage ends of multiple capacitive chips are connected together through the low voltage copper bar to be led to the low voltage end of the insulating sheath so as to form the parallel structure of multiple capacitive chips, the equipment size can be greatly reduced, and the capacitor is suitable for forming a pi-shaped circuit with the resistor and inductor elements to equivalently simulate the 10kV power distribution line impedance value of different line models and erecting and installing modes.

Description

technical field [0001] The invention relates to a high-voltage power capacitor, in particular to a picofarad-level small-sized high-voltage non-partial discharge capacitor used for 10kV distribution line true model simulation impedance. Background technique [0002] In order to adapt to the development needs of the power distribution profession, study the transient and steady-state operating characteristics of complex distribution networks, study new state evaluation technologies for distribution networks, and build state evaluation standards, it is necessary to study the operating characteristics of distribution network lines in depth, but due to site conditions, etc. Due to the limitation of factors, it is impossible to set up real 10kV distribution lines and their branch lines. Therefore, it is an effective means to build a distribution network true test platform according to the equivalent principle. The core of building a true test platform is to solve the calculation o...

AI Technical Summary

Problems solved by technology

The capacitance level of the line impedance simulation capacitor of the distribution line is picofarad level, while the capacitors for phase shifting, compensation and voltage equalization are from tens of microfarads to tens of millifarads, which cannot be applied;

[0005] 2. Poor frequency response characteristics

For capacitor chips, generally, the larger the capacitor capacity, the lower the resonance frequency and poor frequency response characteristics. Especially when the capacitor resonance frequency is in a specific frequency range, it will bring serious errors to the research on the transient stability characteristics of 10kV distribution lines;

[0006] 3. Large size

In order to meet the insulation requirements of the current high-voltage power capacitors, the insulation distance between the internal components of the capacitor, the insulation distance between the terminal and the shell, and the distance between the terminals are relatively large, resulting in a large volume of the entire capacitor

Excessive capacitor volume makes the impedance model of 10kV distribution line extremely large, which cannot meet the space requirements of laboratory intensification and miniaturization;

[0007] 4. The partial discharge level cannot meet the requirements

Since the 10kV distribution line real-type test platform needs to simulate various fault operating conditions of the 10kV distribution line, it will be frequently subjected to overvoltage and overcurrent assessments. Insulation deterioration affects the service life of capacitors, shortens the platform maintenance cycle, and increases platform maintenance costs

On the other hand, the partial discharge of the original component itself will have an impact on the study of the transient stability characteristics of the distribution line

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