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Author: AdminEMTP-RV
Type: Document
Downloaded: 463 times
Date: 2012-06-18

Presentation of an approach based on EMTP for the calculation of lightning induced overvoltages

Description:
Authors:
A. Xémard, P. Baraton, B. Bressac, N. Qako, J. Mahseredjian, G. Simard, J. Ribeiro, R. Tarafi, A. Zeddam.

Abstract:
LIPS (Lightning Impact on Power Systems) is a toolbo... see morex based on EMTP (DCG version) and devoted to the calculation of the failure rate of apparatus due to lightning. This software covers direct and induced lightning. It has been developed in a partnership project between France Telecom, Hydro-Québec and électricité de France. The induced lightning nearby the electrical system. It is based on the following computational steps:
1) For each overhead line and underground cable of the electrical system, two equivalent current sources are calculated in the frequency domain, representing the illumination of the conductors by external electrical field due to lightning. These sources are evaluated in the frequency domain, taking into account the variation of the parameters of lines and cables with frequency. The conductivity of the ground is taken as finite. The modal theory is applied in the case of multi-conductor cable or line.
2) The equivalent sources are converted into time-domain and then included in an EMTP representation of the system allowing a time-domain transient computation. this approach and follow by comparisons between induced overvoltages calculated by LIPS and results from the literature.

Tag(s):

Author: gerinlajoie.luc
Type: Model
Downloaded: 216 times
Date: 2012-06-18

Sequence controlled voltage and current sources.

Description:
Three sequences voltage and current sources are proposed, the positive, negative and zero sequences. The magnitude and the angle are controllable; the carrier is given by the user.

Theses p... see morearts could by used for artificial power swing or unbalances voltages.

Tag(s): Source

Author: AdminEMTP-RV
Type: Model
Downloaded: 912 times
Date: 2012-06-18

V_Swing

Description:
This design introduces a three-phase User-defined Swing Voltage Source.
This design should be used with version 1.0.2.

The Swing Voltage Source is used to study the behavior of synchro... see morenous machines connected to a 500 kV network.

Tag(s): Source

Author: AdminEMTP-RV
Type: Model
Downloaded: 187 times
Date: 2012-06-18

V_unb_I2motor

Description:
This design introduces an unbalance three-phase voltage source defined by specified symetrical components. The source is initialized and an angle is defined.
This design should be used with versi... see moreon 1.0.2

This source is used to estimate the I2/I1 ratio of a large induction motor.

Tag(s): Example