Electrical distribution networks incorporating means for sectionalizing faulted load sections

Claim 2

An alternating current high voltage electrical power distribution network, comprising: a. a pair of load branches, each branch having first, second and third load section means coupled thereto at spaced locations therealong; b. a first switching system connecting said first and second load section means; a second switching system connecting said second and third load means; and a third switching system connecting the third load means of each of said pair of load branches with one another; c. said first switching system comprising first and second series connected switches; the first of said switches having an input, output, and an intermediate terminal, the input terminal connected with said first load section means and the output terminal connected with said second switch, and a switch contactor adapted to transfer the said output terminal from electrical connection with said input terminal to electrical connection with said intermediate terminal in response to a loss of voltage at said input terminal; said second switch being normally closed and adapted to open in response to excessive current therethrough; d. said second switching system comprising first and second series connected switches, the first of said switches having its input connected to said second load section means and adapted to open in response to a loss of voltage at its said input, the second of said switches being normally closed and adapted to open in response to excessive current therethrough; e. said third switching system comprising first and second series connected switches, the first of said switches being normally open and adapted to close in response to a loss of voltage at either the input or the output of said third switching system, the second of said switches being normally closed and adapted to open in response to excessive current therethrough; f. a pair of power sources respectively coupled to each of said branches for providing, during absence of faults in any of said load section means, a preferred source of electrical power to the first, second and third load means of each branch; and g. auxiliary power sources respectively connected to the intermediate terminal of the first switch of each of said first switching systems; h. said first, second and third switching systems being responsive to faults occurring in any of the first, second and third load section means for isolating the faulted load means while transferring or maintaining the remaining non-faulted load section means in communication with either said preferred sources of power or said auxiliary sources of power.

Claim 3

An alternating current high voltage electrical power distribution network, comprising: a. a pair of load branches, each branch having first, second and third load section means coupled thereto at spaced locations therealong; b. a first switching system in each of said branches connecting said first and second load section means; a second switching system in each of said branches connecting said second and third load means; and a third switching system connected with the first switching system of each load branch; c. said first switching system comprising first and second series connected switches, the first of said series connected switches having its input connected to said first load section means and adapted to open in response to a loss of voltage at its said input, the second of said series connected switches being normally closed and adapted to open in response to excessive current therethrough; d. said second switching system comprising first and second series connected switches; the first of said switches having an input, output, and an intermediate terminal, the input terminal connected with said second load section means and the output terminal connected with said second switch of said second switching system, and a switch contactor adapted to transfer the said output terminal from electrical connection with said input terminal to electrical connection with said intermediate terminal in response to a loss of voltage at said input terminal; said second switch of said second switching system being normally closed and adapted to open in response to excessive current therethrough; e. said third switching system comprising a normally open switch adapted to close in response to a loss of voltage at either the input or the output of said third switching system; f. a pair of power sources respectively coupled to each of said load branches for providing, during absence of faults in any of said load section means, a preferred source of electrical power to the first, second, and third load section means of each load branch; and g. auxiliary power sources respectively connected to the intermediate terminal of the first switch of each of said second switching systems; h. said first, second and third switching systems being responsive to faults occurring in any of the first, second and third loaD section means for isolating the faulted load section means while transferring or maintaining the remaining nonfaulted load section means in communication with either said preferred sources of power or said auxiliary sources of power.

Claim 4

An alternating current high voltage electrical power distribution network, comprising: a. a pair of load branches, each branch having first, second and third load section means coupled thereto at spaced locations therealong; b. a first switching system in each of said branches connecting said first and second load section means; a second switching system in each of said branches connecting said second and third load means; and a third switching system connected with the first switching system of each load branch; c. said first switching system comprising first and second series connected switches, the first of said series connected switches having its input connected to said first load section means and adapted to open in response to a loss of voltage at its said input, the second of said series connected switches being normally closed and adapted to open in response to excessive current therethrough; d. said second switching system comprising first and second series connected switches; the first of said switches having an input, output, and an intermediate terminal, the input terminal connected with said second load section means and the output terminal connected with said second switch of said second switching system, and a switch contactor adapted to transfer the said output terminal from electrical connection with said input terminal to electrical connection with said intermediate terminal in response to a loss of voltage at said input terminal; said second switch of said second switching system being normally closed and adapted to open in response to excessive current therethrough; e. said third switching system comprising a normally open switch adapted to close in response to a loss of voltage at either the input or the output of said third switching system; f. a pair of power sources respectively coupled to each of said load branches for providing, during absence of faults in any of said load section means, a preferred source of electrical power to the first, second, and third load section means of each load branch; and g. auxiliary power sources respectively connected to the intermediate terminal of the first switch of each of said second switching systems; h. said first, second and third switching systems being responsive to faults occurring in any of the first, second and third loaD section means for isolating the faulted load section means while transferring or maintaining the remaining nonfaulted load section means in communication with either said preferred sources of power or said auxiliary sources of power.

Claim 5

An alternating current high voltage electrical power distribution network, comprising: a. a pair of load branches, each branch having first, second and third load section means coupled thereto at spaced locations therealong; b. a first switching system in each of said load branches connecting said first and second load section means; a second switching system in each of said load branches connecting said second and third load means; and a third switching system connecting the third load means of each of said pair of load branches with one another; c. said first switching system comprising first and second series connected switches, the first of said series connected switches having an input, output, and an intermediate terminal, the input terminal connected with said first load section means and the output terminal connected with said second series connected switch, said first switch adapted to responsively transfer the said output terminal into electrical connection with said intermediate terminal in response to a loss of voltage at said input terminal and to be opened in response to the simultaneous loss of voltage at its said input terminal and the presence of a fault occurring in said second load section means; the second of said series connected switches being normally closed and adapted to open in response to excessive current therethrough; d. said second switching system comprising first and second series connected switches, the first of said switches of said second switching system having its input connected to said second load section means and adapted to open in response to a loss of voltage at its said input, the second of said switches of said second switching system being normally closed and adapted to open in response to excessive current therethrough; e. said third switching system comprising first and second series connected switches, the first of said switches of said third switching system being normally open and adapted to close in response to a loss of voltage at either the input or the output of said third switching system, the second of said switches of said third switching system being normally closed and adapted to open in response to excessive current therethrough, and means for preventing the first of said switches in said third switching system from closing when a fault is present in either the third load means of said first load branch or the third load means of said second load branch; f. a pair of power sources respectively coupled to each of said load branches for providing, during absence of faults in any of said load section means, a preferred source of electrical power to the first, second and third load section means of each brand; and g. auxiliary power sources respectively connected to the intermediate terminal of the first switch of each of said first switching systems; h. said first, second and third switching systems being responsive to faults occurring in any of the first, second and third load section means for isolating the faulted load section means while transferring or maintaining the remaining nonfaulted load section means in communication with either said preferred sources of power or said auxiliary sources of power.

Claim 6

An alternating current high voltage electrical power distribution network, comprising: a. a pair of load branches, each branch having first, second and third load section means coupled thereto at spaced locations therealong; b. a first switching system in each of said load branches connecting said first and second load section means; a second switching system in each of said load branches connecting said second and third load means; and a third switching system connecting the third load means of each of said pair of load branches with one another; c. said first switching system comprising first and second series connected switches, the first of said series connected switches having an input, output, and an intermediate terminal, the input terminal connected with said first load section means and the output terminal connected with said second series connected switch, said first switch adapted to responsively transfer the said output terminal into electrical connection with said intermediate terminal in response to a loss of voltage at said input terminal and to be opened in response to the simultaneous loss of voltage at its said input terminal and the presence of a fault occurring in said second load section means; the second of said series connected switches being normally closed and adapted to open in response to excessive current therethrough; d. said second switching system comprising first and second series connected switches, the first of said switches of said second switching system having its input connected to said second load section means and adapted to open in response to a loss of voltage at its said input, the second of said switches of said second switching system being normally closed and adapted to open in response to excessive current therethrough; e. said third switching system comprising first and second series connected switches, the first of said switches of said third switching system being normally open and adapted to close in response to a loss of voltage at either the input or the output of said third switching system, the second of said switches of said third switching system being normally closed and adapted to open in response to excessive current therethrough, and means for preventing the first of said switches in said third switching system from closing when a fault is present in either the third load means of said first load branch or the third load means of said second load branch; f. a pair of power sources respectively coupled to each of said load branches for providing, during absence of faults in any of said load section means, a preferred source of electrical power to the first, second and third load section means of each brand; and g. auxiliary power sources respectively connected to the intermediate terminal of the first switch of each of said first switching systems; h. said first, second and third switching systems being responsive to faults occurring in any of the first, second and third load section means for isolating the faulted load section means while transferring or maintaining the remaining nonfaulted load section means in communication with either said preferred sources of power or said auxiliary sources of power.