Simulation Analysis of Grounding Characteristics of Cable Based on ATP-EMTP

Abstract

In order to improve the operation safety and stability of power cables, it is necessary to conduct targeted research on different grounding modes. Firstly, the appropriate cable parameters are selected according to the specific use, and the model is established in ATP-EMTP according to the selected cable parameters. Then, the availability of three grounding modes models of grounding at one end, grounding at both ends and cross-connection grounding (cable core grounding, shielding layer grounding and armor layer grounding) are compared and verified by simulation. Finally, by setting the shielding layers of different thicknesses as a comparison, the impedance and current characteristics of the cables under three different grounding methods are analyzed. The results show that the impedance values of the three grounding methods are basically the same. However, according to the current characteristics, when the shielding layer and the armored layer are cross-connected and grounded, the current of them is much smaller than that which is grounded by other grounding methods. Therefore, under the comprehensive consideration of economic benefits, this grounding is the best choice. This study provides guidance for the grounding mode of cable early laying, and provides reference for other cable related research.

Transient Analysis and Prevention Measures of Lightning Strikes on Step-up Transformers in Wind Farms

“…This paper takes the main transformer of a mountainous wind farm as the research object, analyses the accident process, and causes of the 220 kV booster station main transformer, and proposes a retrofit scheme for installing lightning arresters [1][2][3][4][5]. To analyse the impact of lightning on the booster transformer, this paper establishes a lightning electromagnetic transient analysis model for the collection line based on the electromagnetic transient analysis software ATP-EMTP and verifies the effectiveness of the lightning protection measures [6][7][8][9][10].…”