Reserach Of On-line Monitoring System For XLPE Cable's Insulation

With the large number of applications XLPE power cable, the failure rate is gradually increased, affecting the security and stability of power system operation. The study found that the power cable insulation is an important factor affecting its operational reliability. During operation of partial discharge, electrical trees, water trees can cause deterioration of the cable insulation. Therefore, to carry out the online monitoring of XLPE cable insulation is of great economic and social significance.First, this paper analyzes the advantages and disadvantages of the current domestic offline preventive diagnostic tests XLPE insulation, the use of this method, although more common, but its technology is more passive, there is a big limitation in the diagnostic process in XLPE, can not meet the growing XLPE strict fault detection requirements. The need for new power cable line monitoring methods and equipment.In this paper, the working principle, hardware and software design methods are explained in detail the development of the XLPE cable partial discharge monitoring system, after the actual operation to verify that the system is running well, you can better insulation comprehensive online analytical assessment XLPE cable. Partial discharge electromagnetic coupling method is XLPE cable line monitoring and diagnostics common technology, with high reliability, sensitivity and strong features, this system focuses on the use of the method; Secondly, from software design, hardware design, detail Description; through field trials to assess the health of the system, a comprehensive analysis of judgment. Finally, the development of XLPE cable partial discharge monitoring system is summarized, and the need to improve and continue research and development program.