# US 7,271,508 B2 · Method for deicing energized electrical transmission lines > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,271,508 B2 - Document ID: US7271508B2 - Status: Granted - Kind: B2 - Application number: 10/529,696 - Filed: 2003-10-01 - Published: 2006-06-29 - Granted: 2007-09-18 - Earliest claimed: 2002-10-03 - Assignees: Citeq - Inventors: Jacques Brochu; André Bergeron; Rene Cloutier - Web page: https://patentgrep.com/patent/US7271508B2 ## CPC - H02G 7/16: Devices for removing snow or ice from lines or cables - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES ## Abstract The invention concerns a method for deicing energized electrical transmission lines by means of an apparatus capable of producing an angular offset between its terminals. The method consists in: selecting segments (4, 6) of electrical transmission lines to de deiced, connecting the segments (4, 6) so as to form a loop, connecting the apparatus in series with the segments (4, 6) of the loop to be deiced. In the case of an apparatus with adjustable angular offset, it consists in switching on the apparatus and adjusting the angular offset to impose an increase of current flowing in at least one of the segments (4, 6) as the case may be. In the case of a apparatus with fixed angular offset, it consists in using a switch (54) or a circuit breaker (28) so as to connect the apparatus in the loop, the apparatus and the line segments being previously selected such that the angular offset imposes the required current increase to the deicing of at least one of the segments (4, 6) of the loop. ## Claims ### Claim 1 A method of de-icing energized electric lines of an alternating current voltage distribution or transmission network comprising the steps of: providing an apparatus capable of producing an adjustable angular offset between voltages at its terminals; selecting segments of the energized electrical lines to be de-iced; connecting the segments to form a loop by selectivly operating circuit breakers of the network; connecting the apparatus in series with the segments of the loop to be de-iced; activating the apparatus; adjusting the angular offset of the apparatus to impose an increase in current flowing in at least one of the segments of the loop, thus causing the de-icing of said at least one of the segments of the loop wherein the apparatus further comprises a circuit breaker and further comprising the steps of: measuring a phase displacement at the terminals of the apparatus; adjusting an internal angle of the apparatus to a same value of the phase displacement measured; and operating the circuit breaker of the apparatus into a closed position. ### Claim 2 (depends on 1) The method of de-icing according to claim 1, wherein the apparatus comprises a phase shifting transformer provided with a tap changer for adjusting the angular offset. ### Claim 3 (depends on 2) The method of de-icing according to claim 2, wherein the apparatus comprises a capacitor in parallel with the phase shifting transformer. ### Claim 4 (depends on 1) The method of de-icing according to claim 1, further compromising: operating a line circuit breaker on one of the segments of the loop into an open position for concentrating charging current in the other segment of the loop. ### Claim 5 (depends on 1) The method of de-icing according to claim 1, wherein the apparatus is mobile and the distribution lines are connectable to a sectioning point by means of an interruptor having opposite terminals, the terminals of the apparatus being connected to the terminals of the interruptors, the interruptors, the interruptor being operated into an open position during de-icing. ### Claim 6 (depends on 1) The method of de-icing according to claim 1, wherein the apparatus is connected with the segments of the loop by an interrupting clement, the apparatus being connected in circuit with the loop by operating the interrupting element. ### Claim 7 The method of de-icing according to claim wherein the interrupting element comprises an interruptor. ### Claim 8 (depends on 6) The method of de-icing according to claim 6, wherein the interrupting element comprises a circuit breaker. ### Claim 9 (depends on 1) The method of de-icing according to claim 1, wherein the apparatus is mobile and the distribution lines are connectable to a sectioning point by means of an interruptor having opposite terminals, the terminals of the apparatus being connected to the terminals of the interruptors, the interruptor being operated into an open position during de-icing. ### Claim 10 A method of de-icing energized electric lines of an alternating current voltage distribution or transmission network comprising the steps of: providing an apparatus capable of producing an adjustable angular offset between voltages at its terminals; selecting segments of the energized electrical lines to be de-iced; connecting the segments to form a loop by selectivly operating circuit breakers of the network; connecting the apparatus in series with the segments of the loop to be de-iced; activating the apparatus; adjusting the angular offset of the apparatus to impose an increase in current flowing in at least one of the segments of the loop, thus causing the de-icing of said at least one of the segments of the loop; adjusting an internal angle of the apparatus to a value of zeroes; operating a circuit breaker connected between the segments of the loop in a closed position to short-circuit the apparatus; operating a line circuit breaker on one of the segments of the loop into an open position for concentrating a charging current in the other segment of the loop; and operating the circuit breaker connected between the segments of the loop in an open position. ### Claim 11 (depends on 10) The method of de-icing according to claim 10, wherein the apparatus is connected with the segments of the loop by an interrupting element, the apparatus being connected in circuit with the loop by operating the interrupting element. ### Claim 12 (depends on 9) The method of de-icing according to claim 9, wherein the interrupting element comprises an interruptor. ### Claim 13 (depends on 9) The method of de-icing according to claim 9, wherein the interrupting element comprises a circuit breaker.