New controlled switching approach for limitation of transmission line switching overvoltages

Seyedi, Heresh; Tanhaeidilmaghani, Shahab

doi:10.1049/iet-gtd.2012.0285

Cited by 12 publications

(12 citation statements)

References 13 publications

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“…Still, switching overvoltages (SWOs) can take place under different network states. There are three main events that can cause overvoltage to occur due to switching . Two of them can appear when disconnecting the OTL (disconnection of an off‐load OTL and disconnection of an earth fault), and the third when switching on an open‐ended OTL.…”

Section: Introductionmentioning

confidence: 99%

Simplified approach to reduce transient overvoltages on insulation regarding compaction of 400‐kV overhead transmission lines

Podkoritnik

Vižintin

2019

IEEJ Transactions Elec Engng

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The paper presents a methodology with a new simplified approach, as a set of procedures, aiming to optimize the insulation level when compacting 400-kV overhead transmission lines (OTLs) in order to increase their operational reliability. The procedure initiates from presupposed requirements for compaction, as it is becoming increasingly more difficult to carry out reconstruction, revitalization, or construction of new OTLs while keeping the original design criteria. The main purpose of this approach is to reduce transients on the insulation, which are caused by direct lightning strikes to the tower top, and influence switching overvoltages using an additional shield wire on OTLs. The insulation leader progression model E 50% and the dynamic ionization model E ion for grounding with the constant ratio between the tower grounding resistance R g and specific ground resistivity ρ g are used to evaluate the lightning transients. For the analysis, the switching overvoltages phase domain transmission line model is used, where OTLs are divided into a number of short segments. For the purpose of this investigation, a mathematical model of a double-circuit compact OTL is implemented.

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Section: Introductionmentioning

confidence: 99%

Simplified approach to reduce transient overvoltages on insulation regarding compaction of 400‐kV overhead transmission lines

Podkoritnik

Vižintin

2019

IEEJ Transactions Elec Engng

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“…The impact of switching overvoltages to the OHL has been considered since the first AC transmission lines were built, 14 but it has also been frequently discussed in recently published scientific papers. 15,16 At OHLs with rated voltage equal or greater than 500 kV switching overvoltages are more critical than lightning overvoltages for insulation coordination calculations. 17 OHL energisation with no loading is a common switching operation which results in high overvoltages.…”

Section: Analysis Of Switching Transientsmentioning

confidence: 99%

Advanced teaching method for balanced operations of overhead transmission lines based on simulations and experiment

Forcan

Banjanin

Vuković

2018

International Journal of Electrical Engineering & Education

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An advanced teaching method for the analysis of balanced operations of overhead transmission lines has been described in this paper. The proposed educational method combines theoretical, simulation and experimental approaches with the purpose of a higher-level knowledge achievement. Several exercises have been defined and implemented in the teaching process. Some characteristic overhead transmission line steady state regimes, such as Ferranti effect, natural load flow and capacitive overhead transmission line behaviour, have been analysed. The special analysis has been carried out in order to determine the basic characteristics of the switching transients. Software package MATLAB/Simulink has been used for the estimation of system parameters and for the simulation analysis. Different overhead transmission line models have been compared and useful modelling guidelines have been recommended. Experimental calculations have been performed by using a physically scaled system consisting of multiple Pi sections representing 100 km length 400 kV overhead transmission line. The proposed method has been tested within High Voltage Engineering undergraduate course and useful application feedback from students has been obtained.

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“…Finally, using the obtained data, an Adaptive Neuro-Fuzzy Inference System (ANFIS) has been introduced in an intelligent way to forecast switching overvoltage in a TL. In [11], first, all controlled switching methods in TL have been presented then; statistical switching method has been introduced and a method has been presented for calculating insulation risk. The method presented in this paper, considers the charge trapped in the de-energised line side and selects the optimum point for closing based on the voltage polarity.…”

Section: Introductionmentioning

confidence: 99%

Insulation risk assessment of controlled switching considering pre‐strike voltage and line trapped charge

Deyhim

Ghanizdeh

2019

IET Science, Measurement & Technology

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New controlled switching approach for limitation of transmission line switching overvoltages

Cited by 12 publications

References 13 publications

Simplified approach to reduce transient overvoltages on insulation regarding compaction of 400‐kV overhead transmission lines

Simplified approach to reduce transient overvoltages on insulation regarding compaction of 400‐kV overhead transmission lines

Advanced teaching method for balanced operations of overhead transmission lines based on simulations and experiment

Insulation risk assessment of controlled switching considering pre‐strike voltage and line trapped charge

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