An acousto-optic indicator for the closing degree of an outdoor AC high-voltage isolating switch

Abstract

The invention discloses an acousto-optic indicator for switching degree of an outdoor alternate current high voltage separation switch. A left pile head (3) and a right pile head (4) are arranged at the top of a casing (2); the left pile head (3) is connected with a contact terminal (6) at the bottom of a switch blade of a high voltage separation switch (5); the right pile head (4) is connected with a fixed contact (7) of the switch blade; a judging unit (8) and a direct current testing unit (9) are arranged in the casing (1); both the left pile head (3) and the right pile head (4) are connected with the input end of the direct current testing unit (9); the output end of the direct current testing unit (9) is connected with the judging unit (8); the judging unit (8) is respectively connected with an audible alarm (10), a green alarm lamp (11) and a red alarm lamp (12).

Description

technical field [0001] The invention relates to an acousto-optic indicator for the closing degree of an outdoor AC high-voltage isolating switch. Background technique [0002] The 24kV outdoor AC high-voltage disconnector (commonly known as "knife" in medium-voltage lines) is a very important switching device in medium-voltage distribution lines. Its main functions are: to ensure the safety of medium-voltage power distribution equipment and devices during maintenance work, and to function as an isolation voltage. It cannot be used to cut off, input load current and break short-circuit current. Some switching operations, that is to say, it does not have arc extinguishing function. The use of the switch knife ensures the formation of an obvious fracture and the isolation of the live part during the maintenance of the power distribution equipment. Since the isolating switch has no arc extinguishing device and the breaking capacity is low, when operating the isolating switch, t...

AI Technical Summary

Problems solved by technology

At this time, the contact area between the moving contact and the static contact is not enough, and the knife edge is not tightly closed, causing surface oxidation and increasing the contact resistance. Under the action of the load current flowing through the switch knife, according to the formula Q=I 2 ×R, at this time, the temperature of the contact part of the dynamic and static contacts will be very high. If the switch knife is not closed in place at such a high temperature for a long time, it will become a hidden danger point in the line operation, which will often lead to more serious consequences.

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