In the paper a review on the potential advantages of optical current transformers points out that it is the technology trend
on the development of current transformer. But there are many more difficulties to be resolved, innovative ideas of
developing optical current transformers must be strengthened.
A high voltage current transformer project based on current thermal effect was introduced, which combined the current
thermal effects and the optical fiber thermometry technology. Fiber optic temperature sensor was the earlier and mature
product among fiber optic sensors in commercial, current thermal effects technology is more general applied, so the new
project has the advantages over other current transformer projects which are now meeting the difficulties hardly to
The relationship between the instantaneous value of measured current and the temperature rise was deduced, and the
mathematical model of the current transformer was established. By use of the mathematical model, in theory, the
instantaneous value of current can be tracked by the temperature output of sensor accurately, so that it can be used to
measure instantaneous value of current. The technical data and features required of the main devices and components can
be provided by use of the mathematical model for technical design of the project, simulation method and experiment
tests were used to prove the availability.