Electrothermal combined aged crosslinking polyethylene cable residual life evaluate method

Abstract

The invention discloses an electrothermal combined aged crosslinking polyethylene cable residual life evaluate method comprising the following steps: carrying out a differential scanning calorimetry test for a to-be-evaluated crosslinking polyethylene cable, thus obtaining heating aging reaction activation energy; combining a crosslinking polyethylene cable power frequency to boost the aging test step by step, and obtaining a cable life index and a cable insulation aged received electric stress critical value; using a cable residual life evaluate formula to obtain a cable life curve surface; finally combining with cable real operation conditions so as to calculate and obtain the residual life of the to-be-evaluated crosslinking polyethylene cable. The method is more accurate in cable life evaluation result, can provide supports for determining the cable best repair timing and replace strategy, thus providing active meanings for improving the cable utilization rate and ensuring power grid safe and stable operation and reliable power supply.

Description

technical field [0001] The invention relates to the field of remaining life evaluation of cross-linked polyethylene cables, in particular to an aging evaluation method based on step-by-step piezoelectric aging and accelerated thermal aging experiments. Background technique [0002] Due to the irregular construction of cables, as well as weather and human factors, the cable operating environment has deteriorated, for example, cable accumulation, water accumulation, silt, garbage filling, etc. Studies have shown that changes in the operating environment in the cable tunnel will cause the temperature of the cable to rise and the aging of the cable to increase. In addition to affecting the life of the cable itself, it will also affect the stability of the grid operation. Due to the destruction of the cable operating environment and the overlapping of cables, the heat dissipation channels of many cables are damaged, so that the cables are prone to local overheating and other fau...

AI Technical Summary

Problems solved by technology

[0004] However, due to the complexity of XLPE cable laying and operating environment, it will be affected by electricity, heat and environmental factors in actual operation, resulting in its aging. At present, it is mainly from a macro perspective, according to a certain performance of XLPE Changes in the evaluation of its operating status and service life, can not fully consider the impact of its aging factors, resulting in a certain difference between the evaluation results and the actual situation

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