Low current grounding line selection device

Abstract

The invention discloses a low current grounding line selection device which comprises a connecting bus and a digital signal processor, wherein the connecting bus is provided with a branch; the digital signal processor is connected with the secondary sides of a first current mutual inductor, a second current mutual inductor, and a Nth current mutual inductor connected in series with the loop of the branch; a ground wire is connected to the connecting bus, a disturbance device is connected in series between the connecting bus and the ground wire and comprises a first high-voltage switch, a second high-voltage switch and a third high-voltage switch that are connected in parallel. The low current grounding line selection device can select lines precisely, is widely used for low-current grounding systems, has high performance and high line selection accuracy, and is suitable for industrial fields.

Description

technical field [0001] The invention relates to the technical field of single-phase grounding line selection for distribution networks, in particular to a small current grounding line selection device. Background technique [0002] At present, relevant domestic and foreign technical units have deeply analyzed the characteristics of single-phase ground faults in the distribution network of small current grounding systems, and explored a variety of fault options around the characteristic information of voltage and current power frequency transients, steady states, harmonics, and energy. Line methods, such as zero-sequence current method, zero-sequence power direction method, first half-wave transient current method, and signal input method, etc., and successively launched several generations of fault line selection protection devices. Most of the devices use single-chip microcomputer as the core and are constructed based on one of the above-mentioned line selection principles....

AI Technical Summary

Problems solved by technology

[0003] The current single-phase grounding line selection device mostly uses a single-chip microcomputer or an ordinary industrial computer platform. The single-chip platform cannot meet the calculation requirements of the line selection algorithm due to its low performance, and the accuracy of line selection is low. etc. are vulnerable parts. In industrial sites, especially places with severe dust and other pollution, failures such as fan stop and hard disk damage will occur after one year of operation, which seriously affects the performance of the selected equipment.

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