What should the interpretation of winding-resistance test values indicate for ongoing transformer service?

The expectation for winding-resistance test values in ongoing transformer service is primarily to monitor for deviations over time. This test helps to identify any changes in the resistive properties of the transformer windings, which can indicate potential issues such as overheating, loose connections, or degradation of insulation.

By regularly performing these tests, operators can establish baseline resistance values and track any changes that may occur. If significant deviations are observed, it can alert maintenance personnel to investigate further for possible defects or failures. This proactive approach allows for timely interventions, potentially extending the life of the transformer and ensuring its reliable operation in the electrical system.

In contrast, a need for immediate replacement would typically be reserved for cases where there are clear indications of severe failure, while the assertion that no further analysis is required ignores the importance of ongoing monitoring. Lastly, suggesting that winding resistance values are only relevant during maintenance overlooks their crucial role in preventive maintenance and condition monitoring throughout the transformer's operational life.