Journal
IEEE TRANSACTIONS ON POWER DELIVERY
Volume 38, Issue 3, Pages 1799-1809Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2022.3222774
Keywords
Optical sensors; Monitoring; Bragg gratings; Insulators; Optical fiber composite insulator; icing monitoring; fiber bragg grating (FBG); conductor icing load
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In this paper, a method for monitoring icing load on overhead transmission line conductors and insulators simultaneously was proposed and validated. The authors implanted six optical fibers with multiple FBGs into a composite insulator and developed an icing detection system. The results showed that the method accurately measured the icing load with a relative error within a specific range.
Transmission lines icing is destructive to the operation of the power grid. There is a lack of methods to monitor overhead transmission line conductors and insulators for icing load simultaneously. In this paper, we implanted six optical fibers with three quasi-distributed FBGs each into the interface of a 110 kV composite insulator and built an icing detection system, and proposed three ways for measuring overhead transmission lines icing load. A method for quasi-distributed FBG to differentiate between the measurement of running insulator umbrella and conductor icing load was proposed and validated. The effect of the number of implanted optical fibers on the measurement accuracy was studied. The results show that the relative error of simulated insulator umbrella skirt icing load measurement is -7.3%--2.7%. The 200 m-span running conductor insulator umbrella skirt icing load measurement relative error is -11.5%--3.8%; the relative error of conductor ice measurement is -16.5%-9.0% and absolute error is -0.83-1.5 mm. The composite insulator with an optical fiber embedded can accurately warn of serious icing on the conductor, with two can achieve the conductor icing measuring absolute error of about +/- 1 mm. As for accurately measuring both the umbrella skirt and the conductor icing, it is necessary to implant six optical fibers.
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