Intelligent integrated medium-voltage AC vacuum switchgear based on flexible switching-closing technology

Abstract

The invention discloses an intelligent integrated medium-voltage AC vacuum switchgear based on a flexible switching-closing technology. The switchgear comprises a controller, and a vacuum switching tube, an insulator and a switching-closing mechanism connecting piece, all of which are orderly connected; a microprocessor is arranged in an intelligent circuit; a travel sensor is fixed on a movable contact connecting rod and used for directly detecting the state of motion of a movable contact and obtaining the accurate motion parameters of the movable contact; switching-closing operating parameters are comprehensively calculated according to arc light intensity detected by an arc light transducer and a temperature measured by an infrared temperature measuring transducer, so that the switching-closing performance of switching on and switching off the medium-voltage power grid can be greatly improved, the switching-closing time points are accurately controllable and flexible switching-closing can be realized; an over travel spring arranged in the insulator is capable of providing enough high pressure between the movable contact and the fixed contact of the vacuum switching tube during closing and capable of realizing bounce-free quick switching during switching; in the switching and closing processes, the harmful impact on the power grid, the loads and the switch is quite small and the demand on constructing a strong intelligent power grid can be satisfied.

Description

technical field [0001] The invention relates to an intelligent integrated medium-voltage AC vacuum switchgear applied to a medium-voltage power grid, in particular to an intelligent integrated medium-voltage AC vacuum switchgear based on flexible opening and closing technology, which belongs to the technical field of electric switches. Background technique [0002] Invention patent, the patent number is ZL201410015050.7, the name is integrated high-voltage AC circuit breaker and its protection circuit working method, and the patent number is ZL201410017012.5, the name is intelligent integrated high-voltage AC contactor, all belong to intelligent integrated AC vacuum switchgear , although they have achieved a relatively high degree of intelligence and integration, but because their stroke sensors or stroke detection circuits are installed on insulators (for example, "10" in "ZL201410015050.7", "9" in "ZL201410017012.5" ) or the lower part of the insulator ("8" in "ZL201410015...

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Problems solved by technology

[0002] Invention patent, the patent number is ZL201410015050.7, the name is integrated high-voltage AC circuit breaker and its protection circuit working method, and the patent number is ZL201410017012.5, the name is intelligent integrated high-voltage AC contactor, all belong to intelligent integrated AC vacuum switchgear , although they have achieved a relatively high degree of intelligence and integration, but because their stroke sensors or stroke detection circuits are installed on insulators (for example, "10" in "ZL201410015050.7", "9" in "ZL201410017012.5" ) or the lower part of the insulator ("8" in "ZL201410015050.7", "6" in "ZL201410017012.5"), not in the switch moving contact or moving contact outlet (eg, "ZL201410015050.7" "6" in "ZL201410017012.5", "13" in "ZL201410017012.5"), so it cannot accurately reflect the motion parameters of the moving contact, so it cannot realize the precise control of the moving contact of the switch. As the most important and basic The opening and closing performance for connecting and disconnecting the medium-voltage power grid cannot be greatly improved, and there is no "flexibility" feature, and there are long opening and closing times, poor three-phase synchronicity, uncontrollable timing, and moving contacts when closing The problem of bouncing and bouncing of the moving contact during opening and closing, so the opening and closing process has a large damaging impact on the power grid, load and switch itself, which cannot meet the needs of building a strong smart grid

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