SYSTEM OF SELECTIVE BLOCKING OF AUTOMATIC RECLOSING ON COMBINED AERIAL CABLE TRANSMISSION LINES Russian patent published in 2018 - IPC G01R15/24 H02H3/06 

FIELD: electricity.

SUBSTANCE: invention relates to electric power industry, in particular, to relay protection and automatic equipment (RPA) with a function of automatic reclosing (AR) of electric power transmission lines, and can be used in relay protection systems of combined aerial cable transmission lines (ACTL), performed with a function of prohibition of automatic reclosing for damages on the cable section of ACTL. System comprises device 5 of prohibition of reclosing located on substation 4 and sensor 6 of the total screen current with optical signal manipulator 7 located at the end of cable section 1, and may also comprise second sensor 12 similar to sensor 6 and second manipulator 13 similar to manipulator 7 located on the opposite side of section 1. Control inputs 8 of manipulators 7 and 13 are connected to the outputs of sensors 6 and 12. Fiber optic line 9 connects device 5 to manipulators 7 and 13. Device 5 is provided with source 10 and receiver 11 of optical radiation. Fiber optic line 9 is made in the form of a loop connecting source 10 and receiver 11. Line 9 passes through manipulators 7 and 13, which are configured to interrupt the optical radiation when the unipolar threshold is exceeded by instantaneous values of the output currents of sensors 6 and 12, respectively.

EFFECT: simplifying and increasing the reliability of an AR blocking system, as well as expanding the area of its application to ACTL with increased distance of cable sections from substations and with a longer length of cable sections.

6 cl, 9 dwg