US 2026/0202453 A1Published application

Low-amplitude induced lightning hazard assessment method for distribution network

AssigneeKunming University of Science and Technology

InventorsHongchun SHU, Yutao TANG, Ying CAO, Yiming HAN, Weijie LOU, Yue DAI

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Abstract

A low-amplitude induced lightning hazard assessment method for distribution networks includes: calculating tower height h for each line in the distribution network and soil resistivity ρ of each area, and inputting h and ρ into the corresponding data of each tower in a distribution network lightning detection system; calculating a resistance coefficient k of each tower and inputting k into the corresponding data of each tower in the distribution network lightning detection system; partitioning a lightning-induced overvoltage amplitude U based on severity of hazard and assigning different colors to each partition, and setting a dangerous overvoltage threshold Uset; real time detection of cloud-to-ground lightning and calculating the lightning-induced overvoltage amplitude U of the cloud-to-ground lightning; if U≥Uset, the system issues a warning; if U<Uset, no warning is required; marking the cloud-to-ground lightning on the distribution network area map according to different hazard levels indicated by the colors.

Claims6

Dependent claims

A low-amplitude induced lightning hazard assessment method for a distribution network, comprising the following steps:

Step 1:
collecting a tower height h for each of lines in the distribution network and a soil resistivity ρ of areas where the lines are located, wherein h and ρ are input into corresponding data of each tower in a distribution network lightning detection system;
Step 2:
according to the formula:
k
=
[
2
⁢
5
+
0
.
0
⁢
7
⁢
5
⁢
(
ρ
-
300
)
]
⁢
h
(
1
)
wherein k represents a resistance coefficient of a relationship between a lightning-induced overvoltage and a lightning current amplitude in distribution lines, and k is input into corresponding data of each tower in the distribution network lightning detection system;
Step 3:
partitioning a lightning-induced overvoltage amplitude U based on severity of hazard and assigning different colors to each partition, wherein a dangerous overvoltage threshold Uset is set for dangerous overvoltage;
Step 4:
when the distribution network lightning detection system detects a cloud-to-ground lightning, calculating the lightning-induced overvoltage amplitude U of the cloud-to-ground lightning using the following formula;
U
=
k
D
⁢
I
(
2
)
Step 5:
if U≥Uset, indicating that a cloud-to-ground lightning poses a serious threat to safety of the lines and equipment, and the distribution network lightning detection system issues a warning to remind a maintenance personnel to pay close attention to the cloud-to-ground lightning and nearby lines and equipment;
if U<Uset, indicating that a hazard level of the cloud-to-ground lightning is relatively low and no warning is required;
and
Step 6:
marking the cloud-to-ground lightning on a distribution network area map in the distribution network lightning detection system according to different hazard levels indicated by the colors in Step 3, for review by the maintenance personnel.

47 more elements

Dependencies are inferred from the claim text.