 |
News |
|
|
Product Category |
|
|
|
Company News |
Location:Home-->
Company News |
|
Electric wire electric cable line monitoring conditions and methods
2015/1/28 11:01:44
|
| Nearly a dozen years, with the wide use of XLPE power cable, safety operation and management for XLPE power cables, power cable on-line insulation monitoring technology to achieve rapid development.Abroad in 2O early 60 's weakness began on XLPE cable insulation ageing detection and monitoring technology research, development continues, especially in developed countries such as Europe, and Et has accumulated some experience.Foreign investment in online monitoring system for XLPE cable aging development process offers a wealth of monitoring results, enriches the criterion of cable defects and aging;For xlpe cable system and deterioration trends, based on monitoring results of comprehensive analysis, ontology attempts of XLPE power cable insulation ageing and its annexes of residual life assessment.Japan defects of XLPE cable insulation ageing detection technology practice, cable inspection technology for 10kV and below non-line and on-line.Non-online including: residual voltage, reverse current, leakage current, voltage attenuation method (DC);Superposition method of residual charge, DC voltage (direct current and power frequency);AC loss current (frequency);Method of dielectric loss (SLF).Online include: DC components, fluctuation method (frequency);Superposition of DC voltage (direct current and power frequency), and so on.For higher voltages, then there is no on-line, using non-online only, not for reverse current and DC components, fluctuation, and grew as the DC bias, partial discharge, pressure and so on.Other countries with partial discharge detection for high voltage XLPE cables and their accessories, such as the Netherlands, and Switzerland and the United Kingdom.Currently on the low voltage cables according GB9330--1988, step-up step by step method is used, heat aging test and the control cable as the basis for testing and calculation methods.While there are many academic and research units of foreign monitoring technology |
|
|
|
