Intelligent phase-change switch for preventing inter-phase short circuit before powering and working method thereof

Abstract

The invention relates to an intelligent phase-change switch for preventing inter-phase short circuit before powering and a working method thereof. The three-phase imbalance state is general at present, and there is no effective solution. The technical scheme comprises multiple combination switches K, a control unit and an inter-phase short circuit prevention device, the inter-phase short circuit prevention device comprises a battery and a second relay K2 of which a main contact is connected with the combination switches K, and the battery, the main contact of the second relay K2, one group of combination switch K, a magnetic latching relay K1 coil are connected in series to form an inter-phase short circuit prevention branch; when the combination switch K is on, the magnetic latching relay K1 coil is powered, and the main contact of the magnetic latching relay K1 of the combination switch K is opened. According to the invention, intelligent load unbalance management of a power distribution network low voltage area is realized, insecurity structure that the inter-phase short circuit is a hidden danger in the three-phase imbalance phase-change switch field is changed, and great economic benefit and social benefit are generated.

Description

technical field [0001] The invention relates to an intelligent phase-change switch, in particular to an intelligent phase-change switch for preventing short-circuit between phases before energization and a working method thereof. Background technique [0002] In the three-phase four-wire urban and rural low-voltage distribution networks, users' single-phase loads and three-phase loads are mixed into the grid. Due to the unbalanced load and the asymmetrical parameters of the system components, there is a common situation of unbalanced load among the three phases. At the same time, the irregularity and unpredictability of user load imbalance may easily lead to long-term imbalance of low-voltage distribution transformer load. [0003] According to statistics, at present, more than 85% of rural low-voltage distribution substations in the country have different degrees of three-phase unbalanced state. In addition to using experience to distribute loads as reasonably as possible,...

AI Technical Summary

Problems solved by technology

Due to the unbalanced load and the asymmetry of the system component parameters, there are generally unbalanced loads among the three phases

At the same time, the irregularity and unpredictability of user load imbalance may easily lead to long-term imbalance of low-voltage distribution transformer load

[0003] According to statistics, at present, more than 85% of rural low-voltage distribution substations in the country have different degrees of three-phase unbalanced state. In addition to using experience to distribute loads as reasonably as possible, the power sector has almost no effective solutions. Protective measures such as increasing the cross-section of the neutral line to reduce the safety risks caused by excessive three-phase unbalance

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