空载损耗是指当变压器二次绕组开路，一次绕组施加额定频率正弦波形的额定电压时，所消耗的有功功率。空载损耗即不变损失。与通过的电流无关，但与元件所承受的电压有关。影响变压器空载性能的因素很多，如硅钢片的材料性能，加工工艺及装备、铁芯的结构形式等。
首先，本文对三相电力变压器空载损耗、负载损耗在线检测理论进行了讨论和分析。
Firstly, this paper shows a method to detective the open circuit loss and the load loss of the there-phase power transformer online by operating the real-time voltage and current of the transformer.
并结合实际测量数据，详细分析了单相空载损耗比对发现变压器线圈和铁心局部缺陷的准确性和有效性。
Each and every idle loss ratio has been checked against actual measurement for accuracy and effectiveness in identifying local defects in windings and cores of transformers.
本实用新型结构简单、成本低、空载损耗低、可靠性高，同时使变压器运输更方便。
The utility model has simple structure, low cost, low open circuit losses, and high dependability, and the utility model makes the transportation of the potential transformer more convenient.
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