Analysis Of Grounding Induced Circulating Current Of XLPE Power Cable

XLPE power cable has been under development in science and technology gradually and begun to apply in many ways for nearly twenty years. The reaserch of XLPE power cable insulation state of online is popular either at home or abroad, and the most important results in many parts of the state are carried on the main insulation.This paper describes the importance of the cable grounding system, focusing on a single-grounded analysis of the relevant circumstances. And modeling and analysis that are at the laying of the metallic layer under the EMF, and also depicts the operation under normal and exceptional circumstances, such as the role of over-voltage, lightning, short circuit protection layer of metal such as EMF’s formula; established models, which is about the metal sheath XLPE power cable ground sensors circulation model, and the circuit model grounded capacitor current; also be related to ground current formula, the induced current could then be ground, but also there are some special circumstances, including insulation failure and grounding system defects, and so on.Three-stage conversion method is a common method of laying power cables, so you can achieve the purpose of reducing the sheath voltage. However, transposition of the three sections of unequal length cable, power cable lines often occur in the transformation, the sheath voltage imbalance occurs, the resulting sheath circulation. To solve this problem, the cable can give a single, two-loop calculation model, the model is based on an arbitrary arrangement of the sheath under the induced voltage; to make the sheath voltage balance, we can finally end the cable plus compensation device, usually point of view to compensate the inductor, so reducing the sheath current. Combined with further elaboration of relevant engineering. The principle is that the compensation package in the power cable on the device, when the current through the cable when the compensation device above the induced electromotive force, cable sheath voltage drops due to the role of EMF generated offset. Compensation inductor simulation show that the induced voltage in the cable sheath to some extent reduced, thereby reducing the protection layer circulation, that reduce cable loss.