Following our exploration of basic routine transformer tests in Part 1, this article provides an in-depth analysis of three critical components for evaluating transformer performance and safety: the Open-Circuit (OC) Test, Insulation Resistance (IR) Test, and Temperature Rise Test.
The Open-Circuit test effectively reveals the magnetization characteristics and the health of the iron core by measuring no-load losses and current. The Insulation Resistance test serves as a vital safety threshold before commissioning, assessing the overall integrity of the insulation system. Finally, the Temperature Rise test directly validates the transformer’s cooling efficiency and thermal stability under full-load conditions. Mastering these tests is essential not only for verifying design parameters but also for ensuring the long-term operational reliability of power systems.
Kingrun Transformer Instrument Co.,Ltd.
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