Arc striking type mixing current limiting fuse

Abstract

The invention relates to a current limiting fuse used during short circuit fault of a power grid, in particular to an arc striking type mixing current limiting fuse for overcoming the defects of low current limiting capability or high cost, large size, and the like of the traditional fuse. The arc striking type mixing current limiting fuse comprises a rapid fuse. The arc striking type mixing current limiting fuse is characterized by also comprising a high-speed current-carrying isolator and an arc striking device for striking the high-speed current-carrying isolator. The rapid fuse is connected in series with the arc striking device after connected in parallel with the high-speed current-carrying isolator. On one hand, the invention is used for comprehensively optimizing and designing thearc striking device, the high-speed current-carrying isolator and the rapid fuse, can maintain lower power consumption at kiloampere grade rated current, be rapidly cut off in short-circuit current and transfer the current to a branch circuit of the rapid fuse; and on the other hand, compared with an electronic control type mixing current limiting fuse, the scheme not only improves reliability but also greatly reduces the size and the cost by directly utilizing the heat effect of the short-circuit current as fault judging data and the striking condition.

Description

technical field [0001] The invention relates to a current-limiting fuse used when a power grid is short-circuited, in particular to an arc-triggered hybrid current-limiting fuse. Background technique [0002] With the increasing degree of modernization of the power system, the continuous development of new power supply networks and the continuous increase of system capacity, on the one hand, the reliability, continuity and quality of power supply of the system have been improved, but at the same time, it has also brought a short-circuit fault current With the rapid increase of the level, the harm of short-circuit current is becoming more and more prominent. When the short circuit is serious (such as a short circuit at the outlet of the generator), the short circuit current will reach 100kA or even greater. Therefore, if the appropriate current limiting technology is not adopted in the power system, once a short-circuit fault occurs, the effective protection of the system wi...

AI Technical Summary

Problems solved by technology

Ordinary current-limiting fuses can effectively limit short-circuit current at small rated currents, but as the rated current increases and the voltage level increases, its current-limiting performance becomes worse and cannot meet the requirements

The hybrid current-limiting fuse using the electronic control unit has the advantages of large rated capacity, fast breaking speed and strong current limiting capability, but it needs to add sensors, logic control units and reliable power supplies, which is costly, bulky, and may cause malfunction and refuse to move

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