互感器校验仪是一种用于测试电力系统中互感器误差的设备。随着技术的发展，互感器校验仪也在不断革新，从手动、自动再到智能化发展，成为了研究热点。按照使用方法介绍了测差法和直接比较法2类校验仪，分析了每种方法的优缺点及相关产品，当前数字式校验仪因其自动化程度高且功能多。数字式校验仪既可用于传统互感器，也可用于非常规互感器，应用范围广，重点探讨了影响数字式校验仪检验精度的3种关键技术，并介绍了一种基于小信号的现场校验新技术，与目前常用的现场校验方法对比有显著优点，兼容性强，安全性高，使互感器校验装置更加小型便携，适用于多种场合。最后指出互感器校验仪应不断朝着数字化、智能化、便携化、精度提升和综合性能提升方向发展。

Transformer calibrators are a kind of equipment used to test the transformer error in the power system. With the development of technology, the transformer calibrator is also constantly innovating, from manual, and automatic to intelligent development, which has become a research hot spot. Two types of calibrators according to the usage method, namely the difference measurement method and the direct comparison method were introduced and the advantages and disadvantages of each method and related products were analyzed. Currently, digital calibrators had became a research hotspot because of their high degree of automation and multiple functions. The digital calibrator could be used for both conventional and non-conventional transformers, with a wide range of applications. Three key technologies that affect the accuracy of the digital calibrator are focused on by the paper. And a new technology based on small-signal on-site calibration were introduced, which had significant advantages over the current commonly used on-site calibration methods, with strong compatibility and high security, making the transformer calibration device smaller and more portable, and suitable for a wide range of occasions. Finally, it was pointed out that the transformer calibrator should continuously develop towards digitalization, intelligence, portability, accuracy improvement, and comprehensive performance improvement.