Three-dimensional lightning protection system for power grid

Abstract

The invention discloses a three-dimensional lightning protection system for a power grid. The power grid includes a three-phase high-voltage transmission line and an intelligent terminal connected to the power grid and used for calculating user power consumption. The three-phase high-voltage transmission lines are respectively grounded through a high-voltage alumina lightning arrester. , the three-phase high-voltage transmission lines are grounded through a three-phase power supply lightning protector, at least one decoupler is respectively arranged on the three-phase high-voltage transmission lines, and the three-phase high-voltage transmission lines are respectively grounded through a single-phase power supply lightning protector. The three-phase high-voltage transmission lines are A phase, B phase, and C phase. The smart terminal communicates with the outside through a lightning protection circuit connected to the RS‑485 signal line. The lightning protection circuit consists of two resistors, two transient current blockers, three transient diodes, and a photoelectric isolator. The integrated three-dimensional lightning protection arrangement of strong and weak currents proposed by the present invention can effectively release interference from direct lightning strikes, induced lightning strikes and surges.

Description

【Technical field】 [0001] The invention relates to the field of power transmission and transformation equipment, in particular to a three-dimensional lightning protection system for power grids. 【Background technique】 [0002] With the full coverage and popularization of electricity information collection systems, RS-485 data signal technology is widely used. Interferences such as direct lightning strikes, induced lightning and surges have become problems that RS-485 data signal lines often encounter in actual projects. Lightning can seriously damage the system formed by the RS-485 communication bus, and the surge interference generated by the power supply can also seriously affect the data transmission quality of the RS-485 communication bus. In addition, since many rural and remote mountainous areas do not have grounding wires installed for electricity consumption, and a large part of the lightning-prone areas overlaps with these areas, some smart monitoring terminals are i...

AI Technical Summary

Problems solved by technology

Lightning can seriously damage the system formed by the RS-485 communication bus, and the surge interference generated by the power supply can also seriously affect the data transmission quality of the RS-485 communication bus

In addition, since many rural and remote mountainous areas do not have grounding wires installed for electricity consumption, and a large part of the lightning-prone areas overlaps with these areas, some smart monitoring terminals are installed far away from the grounding wires, and the wiring has certain construction difficulties. Each intelligent monitoring terminal is independently grounded, and due to the different grounding resistance, the potential of each grounding point is different, which will cause a loop current between the two intelligent monitoring terminals and affect signal transmission

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