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Lightning attachment models and maximum shielding failure current of overhead transmission lines: implications in insulation coordination of substations

Lightning attachment models and maximum shielding failure current of overhead transmission lines: implications in insulation coordination of substations

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Published

The maximum shielding failure current of overhead transmission lines is an important parameter in evaluating the shielding performance of the lines and in insulation coordination of substations. General expressions for the estimation of the maximum shielding failure current of transmission lines, derived by employing several lightning attachment models in shielding analysis, are presented. An application to typical 110 kV up to 1150 kV overhead transmission lines shows that there is a great variability in maximum shielding failure current among lightning attachment models. The importance of maximum shielding failure current in insulation coordination of substations is demonstrated with the aid of alternative transients program-electromagnetic transients program (ATP-EMTP) simulations. The computed overvoltages impinging on 150 and 400 kV gas insulated system (GIS) substations because of shielding failure of the incoming overhead transmission lines, being dependent upon shielding failure current, vary with the lightning attachment model employed in shielding analysis of the lines. Implementation of the electrogeometric model adopted by IEEE Std 1243:1997 in shielding analysis imposes high requirements on protection of the substations against incoming shielding failure surges.

Inspec keywords: substation insulation; cable shielding; lightning protection; power overhead lines; EMTP

Other keywords: electrogeometric model; insulation coordination; maximum shielding failure current; ATP-EMTP simulations; overhead transmission lines; substations; voltage 150 kV to 400 kV; IEEE Std 1243:1997; lightning attachment models; shielding performance

Subjects: Power engineering computing; Overhead power lines; Power system protection; Substations

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