POLYETHYLENE CABLES DUE TO ADVERSE ENVIRONMENTS
Type 2. At low voltage levels, a type 1 response, but at higher voltage levels, a nonlinear loss versus frequency characteristic
10 RESPONSE TO CABLE FAILURES
10.4 Repair Options
10.4.3 Acceptance Testing
The scope and complexity of the postinstallation testing is related to the scope of work
performed. Influencing factors are the time required to perform the recommended tests, whether the repair is considered temporary or permanent, the impact of testing on older cable in the circuit that was not replaced, and the value of diagnostic test data if a partial circuit replacement is performed using a different cable type (that is, XLPE cable spliced onto EPR cable).
Acceptance and postmaintenance tests should provide reasonable assurance that the repairs have been performed adequately to ensure that the equipment is safe to return to service and capable of performing its design function. In addition, if diagnostic tests are performed as part of this testing, a baseline will be available for comparison to later test results.
The following tests should be considered when repairs or replacements have been performed:
Shield continuity check for all conductors (shielded cable only).
Insulation resistance test to confirm acceptability for performance of a withstand test.
Withstand test of each conductor. The test value should be based on the manufacturer’s recommendations for newly installed cable or in accordance with the guidance provided in IEEE Std. 400.
Diagnostic test of each conductor as a baseline.
Response to Cable Failures
If replacement of the cable is on the critical path in an outage, diagnostic testing could be deferred to a more convenient time. Aging of a medium-voltage cable takes a long period.
Accordingly, baseline testing of the cable a few years into operation would be acceptable.
When old and new segments are to be combined, both segments should be tested separately before splicing to verify the adequacy of the segments and then again after splicing to verify the adequacy of the splices and terminations of the completed cable. At minimum, the completed cable should withstand testing to verify that no serious damage has occurred during installation and that no splicing or termination errors have occurred.
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