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Power cable as the power system a major power transmission equipment, has an irreplaceable role. In recent years, with the continuous development of the cable, rubber cable due to its excellent insulating properties and economic performance, more and more widely, along with the many different problems with traditional cable. Rubber Cable insulation defects hidden development quickly, the traditional cable DC voltage test sensitivity is not high, the resulting insulation fault also increased year by year. Popular Rubber cable insulation preventive test methods were analyzed to compare their advantages and disadvantages. From a practical point of view, we believe, Rubber cable insulation test AC voltage test first recommended the oscillation test as an alternative to AC voltage test acceptance test, the 0.1Hz dielectric loss test and pressure as a general preventive tests the main test. 10kV system, if the site conditions are not met, the DC voltage test instead of the AC voltage test, but generally not recommended. We strongly recommend the development of on-line monitoring of the cable technology, pointed out that the main difficulties of the constraints of online monitoring technology is in the following three aspects: to improve the precision and anti-jamming capability, the insulation condition assessment tools for basic research and the accumulation of empirical data, the computer real-time processing techniques. If we can solve the above problems, developed for field applications mature online monitoring technology, no doubt on the the cable safe operation, extended service life and reduce accident losses is important. Through the experience of practical work over the years, we found that the Rubber power cable insulation failure is more concentrated in the cable accessories (cable head) position. According to our analysis, mainly due to the low quality of the production and installation of cable accessories. In order to prevent cable insulation failure, in addition to the emphasis on insulation to prevention trials, more importantly, should pay attention to the production and installation of cable accessories, strengthen the quality control of the production of cable accessories. By these measures taken, Rubber cable insulation failure rate is greatly reduced, also achieved good results in practice, to improve the safe operation of the grid system coefficient, to reduce the economic losses caused due to the of Rubber cable insulation accident. Therefore, we believe that if we can establish a reliable quality control procedures, can remove the conventional destructive for acceptance testing, this is the future direction of cable fabrication and installation should strive.
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