Reliability of an all-optical differential current detection technique during environmental temperature perturbations

Abstract

The reliability of a novel, all-optical differential current protection scheme over varying environmental conditions is investigated in this paper. By monitoring the optical power reflected from two matched hybrid fiber Bragg grating current sensors and using a simple and low-cost optoelectronic threshold detector, a sub-cycle response to an increase in differential current can be achieved. A preliminary laboratory embodiment is constructed in order to emulate a practical deployment of the sensors and characterize the performance of the scheme when the sensors are at different temperatures. We demonstrate that even at a temperature difference of 20 °C between the sensors the system is capable of robust and fastacting fault detection

Impact of optical current transformer on protection scheme of hybrid transmission line

“…Furthermore, [26] defines that all protection classes of digital CT shall have ≥20 dB of anti-aliasing filter attenuation. Previous studies and field tests also show that OCT has various useful applications in power system [27] while also had performed satisfactorily for digital measurement [22], CCP protection [28], and LCD protection [29], even in various temperature conditions [30]. Test result on GE's OCT in Table 8 [31] shows that magnitude and phase accuracy of the proposed OCT would satisfy required error limits in [10].…”