Optical current transformer (OCT) has the characteristics of high measurement accuracy

simple structure

and high safety. Its key component

fiber optic composite insulator

plays a dual role in communication and electrical insulation. However

the existing fiber optic composite insulator cores with different types of fiber optic implantation exhibit defects in material

structure

or fabrication process

which can easily create interfacial weaknesses between the optical fibers and insulation materials

posing a threat to the safe operation of electrical equipment. This paper proposes low-density epoxy-based syntactic foam materials

which are implanted three types of optical fibers: low smoke zero halogen polyethylene (LSZHPE)

ethylene-tetrafluoroethylene (ETFE) copolymer

and bare fiber

and compares and analyses their physical

interface

electricals and other key performance. Research has shown that the LSZHPE fiber system core has excellent comprehensive performance

with a leakage current of less than 100 μA after 150 h water diffusion

an electrical strength of 13.34 kV/mm

while the optical conduction loss after fiber implantation meets the practical application requirements. The electrical performance of ETFE optical fiber and bare fiber system cores is satisfactory

but due to the inherent the interface shear strength is low and the interface reliability is relatively low. This research work provides new insights for the selection of fiber optic composite insulator materials

interface evaluation

and structural optimization.