1 The development of the optimum calculation software of electromagnetic current transform-ers is introduced. The designing and calculating processes are given.

2 Original electromagnetic current transducers a lot of respect being living can not meet the measurement accuracy demand .

3 The comparison between OCT(Optical Current Transducer) and traditional electromagnetic current transformer shows that the former is the ideal substitute for the latter with its good performance.

4 It is different from the traditional electromagnetic current transformer and voltage transformer. It adopts the optoelectronic isolation,[] data digitization and technology of optical communication.

5 In contrast with traditional electromagnetic current transducers, optical current transducers is the substitution.

6 It is different from the traditional electromagnetic current transformer. It adopts the optoelectronic isolation, data digitization and technology of optical communication.

7 With the development of modern power system the traditional electromagnetic current transformer has revealed more and more problems.

8 Electronic current transformer(ECT) is the ideal update of old electromagnetic current transformer and has a series of technical advantages.

9 Optical Current Transformer(OCT)resolves the problems of saturation and low transient precision created by electromagnetic current transformer.

10 Optical Current Transformer (OCT) as a novel representative of current transformer resolves problems of saturation and low transient precision created by electromagnetic current transformer.