The final category, pro-active maintenance, involves re-engineering or re-designed of the equipment. This involves the application of add-on features to existing equipment to make it last longer between maintenance cycles. This aspect of maintenance
requires deep understanding of how the equipment works and a willingness to work with
manufacturers and secondary market vendors to enhance the design of the equipment. An
example of this is the installation of load tap changer filters. These devices may delay the
effects of contact wear and maybe slow the process of contact coking.
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