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Simulation method for calculating lightning back-striking performance of UHV transmission lines

A transmission line and ultra-high voltage technology, which is applied in the field of simulation calculation of lightning backlash performance of UHV transmission line, can solve problems such as no simulation calculation scheme for lightning backlash performance of UHV transmission line, and achieve accurate simulation results

Inactive Publication Date: 2014-03-19
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, this application provides a simulation calculation method for lightning backlash performance of UHV transmission lines, which solves the problem that there is currently no simulation calculation scheme for lightning backlash performance of UHV transmission lines

Method used

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  • Simulation method for calculating lightning back-striking performance of UHV transmission lines
  • Simulation method for calculating lightning back-striking performance of UHV transmission lines
  • Simulation method for calculating lightning back-striking performance of UHV transmission lines

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Embodiment 1

[0048] The present application discloses a method for simulating and calculating the lightning backlash performance of an UHV transmission line. UHV large-span pole towers, anchor towers, and multiple pole towers on the front and rear sides are selected as simulation modeling objects.

[0049] see figure 1 , figure 1 It is a flow chart of a method for simulating and calculating lightning backlash performance of UHV transmission lines disclosed in the embodiment of the present application.

[0050] Such as figure 1 As shown, the method includes:

[0051] Step 101: Divide the wires between the large-span poles and towers into n line segments, and establish a line distribution parameter circuit model for each line segment;

[0052] Specifically, due to the large span and large sag of the wire between two large-span pole towers, this implementation subdivides this wire into n small segments with different average heights, and establishes a circuit model of line distribution par...

Embodiment 2

[0071] see Figure 5 , Figure 5 It is a flow chart of another simulation calculation method for lightning backlash performance of UHV transmission lines disclosed in the embodiment of the present application.

[0072] Such as Figure 5 As shown, on the basis of the first embodiment, this embodiment further adds a step 110: establishing a wire flashover model for each tower. Specifically, when calculating the long-span line with double circuits on the same tower, three different conductor gap flashover paths are considered for each phase conductor, which are flashover discharge along the insulator gap, discharge to the tower body and discharge to the lower cross arm.

[0073] In this embodiment, aiming at the potential distribution characteristics of UHV large-span towers during lightning strikes, a multi-flashover discharge channel model of wires is established to make the simulation process closer to actual operation. The simulation calculation accuracy of lightning count...

Embodiment 3

[0075] When calculating the lightning withstand probability that the lightning current amplitude is greater than the first lightning strike lightning withstand level, we can use the electromagnetic transient simulation calculation method.

[0076] When calculating, the instantaneous value (phase angle) of the power frequency operating voltage is considered as a uniform distribution, that is, the probability of lightning strikes appearing in any phase angle interval of the power frequency cycle is equal. Divide the phase angle of a power frequency cycle into n1 phase angle intervals, then statistically calculate the lightning resistance probability P that the lightning current amplitude is greater than the first lightning counter-attack lightning resistance level:

[0077] P=∑P j / n 1 ,

[0078] where P j is the lightning withstand probability of the line in each power frequency phase angle interval, n 1 Indicates that the phase angle of a power frequency cycle is divided i...

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Abstract

The invention discloses a simulation method for calculating the lightning back-striking performance of UHV transmission lines. The simulation method comprises the following steps: dividing wires among long-span transmission towers into a plurality of line segments, establishing a distributed parameter circuit model for each line segment, establishing a multi-wave impedance model for each tower, then selecting the lightning parameters according to lightning activities, integrating all models and calculating the lightning withstand level, and calculating to obtain the back-striking trip rate of the UHV transmission lines according to the lightning withstand level and a series of formulae. The simulation method disclosed by the invention establishes the distributed parameter models of the line segments in consideration of high long-span transmission towers and long line spans, subdivides the wave impedance of different parts of the towers, and establishes the multi-wave impedance models in consideration of the refraction and reflection processes of lightning waves on the tower bodies so as to make the simulation results more precise and practical.

Description

technical field [0001] The present application relates to the technical field of ultra-high voltage power grids, and more specifically, relates to a method for simulating and calculating lightning backlash performance of ultra-high voltage transmission lines. Background technique [0002] Since UHV transmission lines span very high towers, and the conductor spans are very long, there is a high probability of lightning strikes caused by the upward pilot caused by the tower and ground wire, and it is not easy to repair after a lightning strike accident. However, the existing simulation calculations of lightning backlash performance of transmission lines are generally proposed for ultra-high voltage and below lines, which do not consider the particularity of UHV transmission lines with large spans, so they cannot be applied to UHV transmission lines. Therefore, we need to study a systematic calculation method to simulate and calculate the lightning backlash performance of UHV t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 范冕戴敏万磊李志军何慧雯王磊李振强娄颖
Owner STATE GRID CORP OF CHINA
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