The evaluation of hybrid cable test results is based on strict technical indicators and limit requirements. The DC resistance of the conductor must not exceed the maximum value specified in the standard, and the resistance imbalance rate of the three-phase cable should be controlled within the limited range. The insulation resistance test results must meet the minimum insulation resistance value specified in the standard, typically requiring an insulation resistance of not less than a specific megohm value per kilometer of cable. In the power frequency withstand voltage test, the cable should not break down under the specified test voltage, and the leakage current should not exceed the allowable value. The partial discharge quantity must not exceed the standard limit under the specified test voltage, typically requiring less than 5-10 pC. After mechanical performance testing, the electrical performance of the cable should still meet the standard requirements. Flame retardant performance must be assessed through vertical burning and bundled burning tests. The attenuation coefficient of the optical fiber unit should be within the range specified in the product specification.
The results of all test items must be compared with the product technical specifications and relevant standard requirements. Only products that fully meet all technical indicators can be judged as qualified. For non-conforming items, root cause analysis and improvement suggestions must be provided to offer technical support for product quality improvement.
