• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Rte Guerrier Lips Toolbox
 

Rte Guerrier Lips Toolbox

on

  • 1,353 views

 

Statistics

Views

Total Views
1,353
Views on SlideShare
1,352
Embed Views
1

Actions

Likes
1
Downloads
27
Comments
0

1 Embed 1

http://www.slideshare.net 1

Accessibility

Categories

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Rte Guerrier Lips Toolbox Rte Guerrier Lips Toolbox Presentation Transcript

    • CALCULATION OF THE FLASHOVER RATE DUE TO LIGHTNING WITH THE EMTP TOOLBOX LIPS Arnaud GUERRIER 30 / 04 / 09
    • Context ■ For the French overhead lines  Faults due to lightning = 65% of all types of flashover ■ Flashover rate due to lightning depends on :  Grounding resistance of towers  Presence of shield wire  Tower geometry  Length of span  Relief of the area ■ Last important flashover : 3 november 2008 on Néoules – Réaltor 400 kV double circuit line  3-phase tripping occuring simultaneously on both circuits => load shedding of 1450 MW 2
    • Description of LIPS ■ EMTP Toolbox ■ Development by EDF, HydroQuébec, RTE ■ Calculation of the flashover rate due to lightning function of the grounding resistance tower ■ Possible studies :  Evaluation of the flashover rate of an existing line  Optimization of the number of line surge arresters to install on a line  Impact of grounding improvement or installation of sky wires on the flashover rate 3
    • Description of LIPS ■ Modelling of the overhead line  Position of conductors and possible shield wires (same tower used for each span)  Length of span  Phase equiped with Line Surge Arrester ■ Calculation of the flashover rate due to lightning with  ground flash density : number of lightning stroke per year per km² ■ 2 types of flashover :  Shield failure flashover  Back flashover 4
    • Description of LIPS ■ Shield failure flashover : ■ Back flashover : lightning strike on lightning strike on conductors towers or shield wires i(t); di(t)/dt  Overvoltage higher than  A part of the lightning the lightning withstand current goes into the voltage of the insulator du grounding electrode strings  => Overvoltage of the  Arcing between the spark tower gap  Arcing if the overvoltage higher than the lightning withstand of the line 5
    • Example of study (1/3) ■ Objective :  Limit the rate of three-phase tripping occurring on both circuits of a 400 kV double-circuit line  Optimize the number of line surge arresters to install ■ Current rate calculated with LIPS ■ Modelling of the line  2 shield wires  6 spans of 500 m 6
    • Example of study (2/3) : modelling BFOR Start a Flashover Rates study SFFOR adapt50km.lin Analyse Flashover Rates study results View results Lightning1 LINE DATA model in: adapt50km_rv.pun Lightning current source found in the LIPS library 6kA, 70us There must be only one per design sw1 sw2 sw2 6 spans, line length is 3 km sw1 1 1 FD +2 FD +2 a 3 c2phC c2phC 3 b 4 c2phB c2phB 4 c 5 c2phA c2phA 5 c 6 c1phC c1phC 6 a 7 c1phB bfor1 c1phB 7 b 8 c1phA c1phA 8 AC1 + 400kVRMSLL /_300 7
    • Example of study (3/3) : results ■ Number of 3-phase double circuit flashover function of grounding resistance ■ Installation of line surge arresters necessary for grounding resistance of tower higher than 30 ohms. 8
    • Impact of Line Surge Arresters on double circuit line Flashover rate of the line function of grounding resistance tower 1 circuit without LSA Flashover rate on circuit 2 with LSA on phase 1A and 1C Flashover rate on circuit 1 with LSA on phase 1A and 1C 9
    • Conclusion ■ Calculation of the flashover rate due to lightning with LIPS ■ Measurement : grounding resistance tower ■ For a flashover rate given => optimization of the number of towers to treat and reducing the costs 10
    • Thank you for your attention 11