Method of and system for disconnecting faulty distribution line section from power distribution line
First Claim
1. For use with an electric power system including a main controller installed in a distribution substation having a circuit breaker and distribution line fault detecting means, a plurality of section controllers installed in section switches which divide a distribution line drawn out from said distribution substation into a plurality of line sections, and a transmission system for signal transmission between said main controller and said section controllers, a method of carrying out control for, when a fault occurs on said distribution line, disconnecting only a faulty line section from said distribution line, comprising:
- the first step of transmitting a request signal from said main controller to said transmission system when said distribution line fault detecting means detects a fault on said distribution line;
the second step of receiving said request signal transmitted from said main controller over said transmission system by said section controllers;
the third step of detecting the fault by said section controllers;
the fourth step of transmitting to said transmission system fault detect signals indicating a fault or non fault from said section controllers which have received said request signal in the second step or performed in the third step;
the fifth step of, by each of said section controllers, receiving said fault detect signals transmitted from other section controllers over said transmission system;
the sixth step of, by each of said section controllers, Judging whether or not its associated section switch divides said distribution line between faulty and normal line sections on the basis of said fault detect signals received from said other section controllers in the fifth step; and
the seventh step of, by each of said section controllers, opening its associated section switch when it is judged in the sixth step that its associated section switch is dividing said distribution line between faulty and normal line sections.
1 Assignment
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Accused Products
Abstract
A main controller installed in a distribution substation of an electric power system sends a request signal to each of section controllers installed in individual section switches upon detecting a distribution line fault. Each of the section controllers performs fault detection individually. Each section controller judges whether its associated section switch is dividing the distribution line between faulty and normal line sections on the basis of fault detect signals from the other section controllers. If it is judged that its associated section switch is dividing the distribution line between faulty and normal line sections, that section controller opens its associated section switch.
46 Citations
20 Claims
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1. For use with an electric power system including a main controller installed in a distribution substation having a circuit breaker and distribution line fault detecting means, a plurality of section controllers installed in section switches which divide a distribution line drawn out from said distribution substation into a plurality of line sections, and a transmission system for signal transmission between said main controller and said section controllers, a method of carrying out control for, when a fault occurs on said distribution line, disconnecting only a faulty line section from said distribution line, comprising:
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the first step of transmitting a request signal from said main controller to said transmission system when said distribution line fault detecting means detects a fault on said distribution line; the second step of receiving said request signal transmitted from said main controller over said transmission system by said section controllers; the third step of detecting the fault by said section controllers; the fourth step of transmitting to said transmission system fault detect signals indicating a fault or non fault from said section controllers which have received said request signal in the second step or performed in the third step; the fifth step of, by each of said section controllers, receiving said fault detect signals transmitted from other section controllers over said transmission system; the sixth step of, by each of said section controllers, Judging whether or not its associated section switch divides said distribution line between faulty and normal line sections on the basis of said fault detect signals received from said other section controllers in the fifth step; and the seventh step of, by each of said section controllers, opening its associated section switch when it is judged in the sixth step that its associated section switch is dividing said distribution line between faulty and normal line sections.
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2. In an electric power system including a main controller installed in a distribution substation having a circuit breaker and distribution line fault detecting means, a plurality of section controllers installed in their associated section switches which divide a distribution line drawn out from said distribution substation into a plurality of line sections, and a transmission system for signal transmission between said main controller and said section controllers,
said main controller including first means for transmitting a request signal onto said transmission system when said distribution line fault detecting means detects a fault on said distribution line, and each of said section controllers including: -
second means for receiving said request signal transmitted from said main controller over said transmission system; third means for detecting a fault on said distribution line; fourth means for transmitting to said transmission system a fault detect signal indicating a fault or non fault when said request signal is received by said second means and said third means is performed; fifth means for receiving said fault detect signals transmitted from other section controllers over said transmission system; sixth means for Judging whether or not its associated section switch divides said distribution line between faulty and normal line sections on the basis of said fault detect signals from said other section controllers received by said fifth means; and seventh means for opening its associated section switch when it is Judged by said sixth means that its associated section switch is dividing said distribution line between faulty and normal line sections. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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10. In an electric power system including a main controller installed in a distribution substation having a circuit breaker, distribution line ground fault detecting means and distribution line short-circuit fault detecting means, a plurality of section controllers installed in their associated respective section switches which divide a distribution line drawn out from said distribution substation into a plurality of line sections, at least one interconnection controller installed in its associated interconnection switch for interconnecting an interconnection distribution line to said distribution line, and a transmission system for signal transmission among said main controller, said section controllers and said interconnection controller,
said main controller including first means for transmitting a request signal onto said transmission system when at least one of said distribution line ground fault detecting means and said distribution line short-circuit fault detecting means detects a fault on said distribution line, each of said section controllers including: -
second means for receiving said request signal transmitted from said main controller over said transmission system; third means for detecting a fault on said distribution line; fourth means for transmitting to said transmission system a fault detect signal indicating a fault or non fault when said request signal is received by said second means and said third means is performed; fifth means for receiving said fault detect signals transmitted from other section controllers over said transmission system; sixth means for judging whether or not its associated section switch divides said distribution line between faulty and normal line sections on the basis of said fault detect signals from said other section controllers received by said fifth means; seventh means for opening its associated section switch when it is Judged by said sixth means that its associated section switch is dividing said distribution line between faulty and normal line sections; eighth means responsive to said fault detect signals from said other section controllers received by said fifth means for judging whether or not its associated section switch is located down the fault line section; and ninth means for keeping its associated section switch open or closed when said eighth means judges that its associated section switch is located down the faulty line section of said distribution line, and said interconnection section controller including; tenth means for said fault detect signals transmitted from said section controllers over said transmission system; eleventh means responsive to said fault detect signals received by said tenth means for judging whether or not its associated interconnection switch is interconnected to a non-faulty line section is located down the fault line section of said distribution line; and twelfth means for closing its associated interconnection switch when said eleventh means Judges that its associated interconnection switch is interconnected to a non-faulty line section is located down the fault line section of said distribution line. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification