Lightning round and back hit discriminator of electric transmission line

Abstract

The invention provides a device which can judge the round hit and the back hit of lightning. The device comprises two current sensors (1) and (2), a data transmission module (4), a data processing module (3), a signal transmission device and a display unit, wherein the current sensors are respectively arranged on a vertical rod (a main material) part (A part) arranged under a rod tower crossarm and an insulator hanging hardware fitting part (or near the crossarm) (B and C parts), and the current directions of the two parts are collected by the current sensors so as to judge the round hit or the back hit, lightning charge varieties and lightning current sizes. Compared with the invention with the patent number of 200610089771.8, the lightning round and back hit discriminator adopts the two current sensors to compare current phases so as to omit a controversial voltage sensor. The lightning round and back hit discriminator of an electric transmission line has the advantages that: firstly, the shunt current of rod tower grounded lightning current is measured; secondly, two collected current signals do not have additional phase displacement property and just have same and opposite relations; thirdly, signals can be stably and reliably collected and are not influenced by atmospheric humidity; and fourthly, the cost is low.

Description

technical field [0001] The invention belongs to the field of lightning information measurement, and in particular provides a lightning flashover path detection device for a power transmission line, which adopts a two-part current sensor cooperation scheme to measure the flashover path when a lightning strikes a power transmission line—counterattack or shielding; moreover, the device By processing the output signal of the sensor, the magnitude of the lightning current can also be measured. technical background [0002] Lightning activities are very frequent in our country, and power transmission lines often suffer power outages due to lightning strikes. Lightning strike fault is one of the most common accidents on transmission lines, which seriously affects the safety and reliability of power supply. Whether it is a direct lightning strike (the lightning falls on the line itself) or an induced lightning (the lightning falls near the line), it may cause a flashover of the lin...

AI Technical Summary

Problems solved by technology

[0010] When lightning strikes the tower or shielding causes insulation flashover, because the tower is grounded, the lightning wave will produce negative reflection at the tower, and the time for the potential rise of the tower caused by the lightning strike is much shorter than the charging time constant of the voltage sensor under rainy conditions, so that the voltage sensor There is no output, so the voltage signal cannot be collected

[0011] ③The 200610089771.8 patent cannot measure the lightning current parameters flowing through the tower and into the ground during the counterattack, so the total lightning current parameters cannot be measured

[0012] To sum up, there are defects in judging shielding or counterattack by comparing the lightning current and voltage phase relationship.

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