Background: Outdoor-working insulators could be degraded due to the changes of the
environmental factors. When it degrades to certain extent, the insulating property will reduce, thus the
monitor of insulators’ working condition which is of significance.
Methods: This paper, designs a faulty detecting device based on “Solar Blind” UV pulse for transformer
substation insulators and put forward a multivariant nonlinear regression analysis method to find the
mathematical expression between degree of faulty insulators and distance, UV pulse, environment
humidity. Through the establishment of the faulty insulators test model, this paper ranks the faulty
insulators levels in the form of a percentage, which makes the test result clear and direct.
Results: Experiment results show that, this mathematical relation can be the criterion of faulty
Conclusion: The result can provide research methods and ideas for the on-line assessment of substation