Pole component of solid sealed terminal

Abstract

The invention provides a pole component of a solid sealed terminal. The pole component comprises an upper shield, a lower shield and a vacuum arc-extinguishing chamber, wherein the upper shield and the lower shield are embedded and fixed in a shell of the solid-sealed terminal by a castable insulating material, and the vacuum arc-extinguishing chamber is fixed in the shell of the solid-sealed terminal in a manner of being parallel with or perpendicular to the axial direction of the upper shield and the lower shield. By adopting the technical scheme, a high electric field is transferred to the interior of the insulating layer through the upper shield and the lower shield arranged on the pole component, so that the problem that the electric field in the upper side and the lower side of the terminal is distributed unevenly can be avoided, especially the problem that the junction of three media and the tip of a conductor cause the exceeding of electric field values can be solved.

Description

technical field [0001] The invention relates to the field of design and manufacture of medium and high voltage switchgear, in particular to a pole component of a solid-sealed pole. Background technique [0002] The existing solid-sealed pole generally consists of a vacuum interrupter, an upper outlet terminal, a lower outlet terminal, a flexible connection, a tie rod, and an epoxy resin shell. At present, the upper outgoing terminal is usually fixedly connected with the static terminal conductor of the vacuum interrupter by screws, and the lower outgoing terminal is fixed on the mold, and then the whole is formed by vacuum casting or pressure gel (APG) process by insulating materials such as epoxy resin , but the solid-sealed poles manufactured in this way are generally larger overall and have many materials, and the field strength at the intersection of the three media of the conductor, the insulating material and the insulating gas (usually air, nitrogen or sulfur hexafluo...

AI Technical Summary

Problems solved by technology

At present, the upper outgoing terminal is usually fixedly connected with the static terminal conductor of the vacuum interrupter by screws, and the lower outgoing terminal is fixed on the mold, and then the whole is formed by vacuum casting or pressure gel (APG) process by insulating materials such as epoxy resin , but the solid-sealed poles manufactured in this way are generally larger overall and have many materials, and the field strength at the intersection of the three media of the conductor, the insulating material and the insulating gas (usually air, nitrogen or sulfur hexafluoride) is relatively large , due to the existence of metal tips such as soft connections and triple intersections in the inner cavity of the pole, it is also easy to generate local field strengths that are too large to cause partial discharge problems

[0003] Application number CN 201380007680.3 discloses an embedded or assembled pole part with a vacuum interrupter and its manufacturing method. The embedded pole part has a vacuum interrupter, an upper terminal, and a lower terminal, wherein the surface of the upper terminal covers There is a damping layer, and the moving end of the pole of the vacuum interrupter is connected with the lower outlet terminal and the insulating pull rod through a soft connection. Since the upper terminal is covered with a damping layer and cast into one body through insulating material, it is not conducive to the heat dissipation of the conductor and the conductor and The field strength at the three-medium intersection point between the insulating material and the external gas is relatively high, and at the same time, the field strength at the three-medium junction between the lower end of the arc extinguishing chamber and epoxy and air is relatively high. The end is also prone to the problem of field strength concentration. Due to the above reasons, the electric field distribution of the pole is uneven, which is not conducive to the overall miniaturization of the product and affects the overall insulation performance of the solid-sealed pole.

[0004] Application number CN 201220468759.9 discloses a solid-sealed pole, which includes an upper outlet terminal and an upper outlet rod connected to the upper outlet terminal. Since a cover is provided outside the upper joint to solve the problem of uneven field strength at the connection. However, the problem of field strength concentration at the junction of the upper and lower conductors, epoxy resin and internal gas has not been improved, and the problem of electric field concentration caused by the tip of the lower flexible connection cannot be solved. Covering is therefore not conducive to product heat dissipation

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