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# Rte Guerrier Lips Toolbox

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### Transcript

• 1. CALCULATION OF THE FLASHOVER RATE DUE TO LIGHTNING WITH THE EMTP TOOLBOX LIPS Arnaud GUERRIER 30 / 04 / 09
• 2. 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
• 3. 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
• 4. 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
• 5. 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
• 6. 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
• 7. 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
• 8. 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
• 9. 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
• 10. 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
• 11. Thank you for your attention 11