Medium voltage power distribution equipment

Abstract

The invention relates to an electrical distribution equipment comprising an electrical disconnecting or interrupting device called a first device and an electrical isolating device called a second device, the first device and the second device being connected in parallel, respectively in the open position of the switchgear and closed position, both electrical devices are capable of assuming a first position and a second position, the opening and closing of the first and second electrical devices are controlled by the first electrical device, and when the switching device moves from the closing device to the opening device, the isolation The contacts of the device open first, creating an arc and an arc voltage between its contacts so that substantially all of the current is diverted to the breaking or interrupting device, the opening of which continues until the contacts of the breaking or interrupting device open, until sufficient clearance is obtained between the contacts of said isolating means to prevent any subsequent dielectric breakdown at the location of the isolating means when the transient recovery voltage is established after the contacts of the two means are closed .

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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