Self-healing Optical Current Transformer and Its Application in Smart Substation

The two problems of measurement accuracy and operation stability are impeding the practicability of optical current transformers. To do this, the self-healing optical current sensor technology is proposed. According to the relation standards of electronic current transformer, combining the characteristics of optical current transformer and existing test conditions, the check tests are designed. The optical current transformers used in 220kV smart substation in Liaoning Province have passed the above check tests. The test and operation results show that the developed optical current transformers have the measurement accuracy and operation stability. So the self-healing optical current transformers meet the requirements of large-scale industrial application in smart substation.