Medium voltage power distribution equipment

Abstract

The equipment has a vacuum circuit breaker (3) and a vacuum bulb (5) occupying open and closed positions of the equipment. The breaker has a contact (6) and another contact initially opened to create arc and an arc voltage to allow the current to be derived in the breaker / bulb. The opening of the contacts continues until an insulation distance between the contacts is obtained and before opening of contacts (8, 9) of the bulb so as to avoid dielectric flashover on the bulb during establishment of re-establishment transitory voltage after closing the contacts.

Description

technical field [0001] The invention relates to a medium-voltage electrical distribution device installed between two parts of an electrical circuit so as to perform at least the functions of current flow between the two parts and interruption of the current in the event of an electrical fault. Background technique [0002] A switchboard of the type described above is known, for example, from patent application FR2940516. This switchboard includes a switch or circuit breaker, which also performs an off-switching function, and in series with this switch (or circuit breaker), includes a selector having at least two positions, a current-passing position and a grounding position. [0003] This switchboard is designed to conduct a current of 630A and is therefore not suitable for conducting higher current levels such as 1250A. [0004] When the rated current performance of such switchboards, or any similar switchboards, has to be increased, large investments and undue changes to...

AI Technical Summary

Problems solved by technology

[0004] When the rated current performance of such switchboards or any similar switchboards has to be increased, large investments and excessive changes in operation are required, especially when these switchboards use complex technologies such as armored metal insulation technology

[0005] Furthermore, the fact that these switchboards are able to withstand higher power ratings than the usual mid-range corresponds to a range with a smaller footprint, causing the industrial cost of such a retrofit is not justified

In the case of vacuum circuit breakers, the current conducting function is further very complex and problematic, due to the reduced size of the contacts of the contact box, and their high contact resistance, which increases with the short-circuit operation performed changes in the number of

[0006] Furthermore, the development of such high-current switchboards increases the number of subassembly benchmarks, not to mention all the necessary peripheral improvements involving the main functions of the switchboard, namely, the dielectric and current distribution functions, which in specific cases require this electrical function to be derived from Intricate molding of the cast housing

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