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 comprises three phase high-voltage power transmission lines and an intelligent terminal, wherein the intelligent terminal is connected with the power grid and is used for calculating power consumption of a user, the three phase high-voltage power transmission lines are grounded separately through a high-voltage aluminum oxide lightning arrester and are grounded through three phase power supply lightning protection devices, at least one decoupler is arranged on each of the three phase high-voltage power transmission lines, the three phase high-voltage power transmission lines are grounded separately through a single-phase power supply lightning protection device and are respectively a phase A, a phase B and a phase C, the intelligent terminal is connected with a RS-485 signal line through a lightning protection circuit and is communicated with the outside, and the lightning protection circuit comprises two resistors, two transient current blockers, three transient diodes and an optoelectronic isolator. With a strong-weak electricity comprehensive three-dimensional lightning protection mode proposed by the invention, direct lightning, inductive thunder and surge interference are effectively released.

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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