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Electronic fiber-optical current transformers (EFOCT)

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Operating principle 

The operation of electronic fiber-optical current transformers  based on the Faraday effect – the magneto-optic effect, which consists in that when diffusing the linear-polarized light through an optically inactive substance placed in a magnetic field it is observed the optical rotation of polarization plane depending on the value of that magnetic field.

 

Advantages of Electronic fiber-optical current transformers  

  • No copper secondary circuits used which reduces installation and materials costs;
  • Ferroresonant-free;
  • No high potential and noise (no magnetic field effect) in the secondary circuits due to their natural galvanic insulation (signal transmission via optic fiber);
  • The ability to connect an unlimited number of sampled values data users. Easy and flexible system of scaling;
  • Low cost of day-to-day operations (ownership) and no risk of electrical power supply interruption for the consumer;
  • High-precision measurements and provisions for their integration of all device and receivers of the data;
  • The ability to measure the harmonic components in current and voltage up to the 100-th order;
  • Our method of measuring (fiber-optic sensors based measuring) will provide the accuracy needed whereas the conventional measurement methods (analog) will always be inaccurate;
  • Standardization of network interfacing between the primary and secondary equipment. The ability to implement and standardize all instruments on the basis "standardization instrument solutions" for a wide range of tasks;
  • Personnel safety improvements because of inability for lightning or any other forms of electrical current to pass through the optical cables. Thus, preventing power surges or physical danger;
  • Alternating and direct current measurement capabilities.

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 Electronic fiber-optical current transformer  


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