System, method and device to preserve protection communication active during a bypass operation
First Claim
1. A system for providing protection of a power line using a plurality of intelligent electronic devices (IEDs), comprising:
- a local IED associated with a location of the power line, the local IED adapted to measure and transmit the current associated with the location of the local IED,a remote IED associated with a location of the power line, the remote IED adapted to measure and transmit the current associated with the location of the remote IED,a transfer IED in communication with the local and remote IEDs and adapted to receive the currents transmitted by the local and remote IEDs, said transfer IED further associated with a location of a second power line interconnected with the first power line, wherein said transfer IED calculates the sum of the currents associated with the location of the second power line and the currents received from the local and remote IEDs,a circuit breaker associated with the second power line, said circuit breaker adapted to isolate a location on the second power line,wherein the transfer IED is adapted to transmit the current measured by the transfer IED and the current measured by one of the remote IED and the local IED to the other of the remote IED and the local IED, andwherein when the sum of the currents is not equal to about zero amperes, the transfer IED transmits a signal to cause tripping of the circuit breaker, thereby isolating the location of the second power line associated with the transfer IED.
2 Assignments
0 Petitions
Accused Products
Abstract
Provided is an intelligent electronic device for protection, monitoring, controlling, metering or automation of electrical power system. The system, method and device of the present invention preserves current differential protection active during a breaker bypass or similar operation. A current differential protection system is coordinated by one relay (transfer), which simultaneously establishes and handles multiple two-terminal 87L protection zones with several relays. This “enhanced multiple-terminal system” requires no change to protection settings on any local or remote relays during a bypass process.
-
Citations
44 Claims
-
1. A system for providing protection of a power line using a plurality of intelligent electronic devices (IEDs), comprising:
-
a local IED associated with a location of the power line, the local IED adapted to measure and transmit the current associated with the location of the local IED, a remote IED associated with a location of the power line, the remote IED adapted to measure and transmit the current associated with the location of the remote IED, a transfer IED in communication with the local and remote IEDs and adapted to receive the currents transmitted by the local and remote IEDs, said transfer IED further associated with a location of a second power line interconnected with the first power line, wherein said transfer IED calculates the sum of the currents associated with the location of the second power line and the currents received from the local and remote IEDs, a circuit breaker associated with the second power line, said circuit breaker adapted to isolate a location on the second power line, wherein the transfer IED is adapted to transmit the current measured by the transfer IED and the current measured by one of the remote IED and the local IED to the other of the remote IED and the local IED, and wherein when the sum of the currents is not equal to about zero amperes, the transfer IED transmits a signal to cause tripping of the circuit breaker, thereby isolating the location of the second power line associated with the transfer IED. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A transfer IED for protection of a power line in a power system including a local IED associated with a location of the power line, the local IED adapted to measure and transmit the current associated with the location of the local IED, and a remote IED associated with a location of the power line, the remote IED adapted to measure and transmit the current associated with the location of the remote IED, said transfer IED comprising:
-
a micro-controller in communication with the local and remote IEDs and adapted to receive the currents transmitted by the local and remote IEDs, said micro-controller further associated with a location of a second power line interconnected with the first power line, wherein said micro-controller calculates the sum of the currents associated with a location of the second power line and the currents received from the local and remote IEDs, and wherein when the sum of the currents is not equal to about zero amperes, the micro-controller transmits a signal to cause tripping of a circuit breaker associated with the second power line, thereby isolating the location of the second power line associated with the transfer IED, and wherein the micro-controller is adapted to communicate the currents associated with the location of the second power line and one of the currents received from the local IED and the currents received from the remote IED to the other one of the local IED and the remote IED. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A method for protection of a power line in a power system, including the steps of:
-
measuring the current associated with a first location of a first power line, measuring the current associated with a second location of the first power line, measuring the current associated with a location of a second power line interconnected with the first power line, calculating the sum of the currents associated with the locations of the first and second power lines, transmitting the current associated with the first location of the first power line, the current associated with a second location of the first power line, and the current associated with the location of the second power line to a relay configured to measure the current associated with the first location of the first power line or a relay configured to measure the current associated with the second location of the first power line, and transmitting a signal to a circuit breaker associated with the second power line when the sum of the currents is not equal to about zero amperes. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
-
-
36. A method for maintaining protection of a power line in a power system, including the steps of:
-
measuring the current associated with a first location of a first power line, measuring the current associated with a second location of the first power line, measuring the current associated with a location of a second power line interconnected with the first power line, communicating the current associated with the first location of the first power line, the current associated with a second location of the first power line, and the current associated with the location of the second power line to a relay configured to measure the current associated with the first location of the first power line or a relay configured to measure the current associated with the second location of the first power line, calculating the sum of the current associated with the first location of the first power line and current associated with the location of the second power line, and transmitting a signal to a circuit breaker associated with the location of the second power line when the sum of the currents is not equal to about the current associated with the second location of the first power line. - View Dependent Claims (37, 38, 39)
-
-
40. A system for preserving current differential protection of a power line during a bypass operation using a plurality of intelligent electronic devices (IEDs), comprising:
-
a local current differential IED associated with a location of a first power line, the local IED adapted to measure and transmit the current associated with the location of the local IED, a remote current differential IED associated with a location of the first power line, the remote IED adapted to measure and transmit the current associated with the location of the remote IED, a transfer current differential IED associated with a location of a second power line in parallel with the first power line, the transfer IED adapted to measure and transmit the current associated with the location of the transfer IED, a circuit breaker associated with each of said IEDs, said circuit breakers adapted to isolate a location on its associated power line, wherein said transfer IED is in communication with the local and remote IEDs and adapted to receive the currents transmitted by the local and remote IEDs, said transfer IED further adapted to calculate the sum of the currents associated with the location of the second power line and the currents received from the local and remote IEDs, wherein when the sum of the currents associated with the location of the second power line and the currents received from the local and remote IEDs is not equal to about zero amperes, the transfer IED transmits a signal to cause tripping of its associated circuit breaker, thereby isolating the location of the second power line associated with the transfer current differential IED, the transfer IED further adapted to communicate the current measured by the transfer IED and the current measured by the remote IED to the local IED, and to communicate the current measured by the transfer IED and the current measured by the local IED to the remote IED, wherein the local IED is adapted to receive the current measured by the transfer IED and the current measured by the remote IED, said local IED adapted to communicate a signal to cause tripping of its associated circuit breaker if the current measured by the local IED does not equal the currents received from the transfer IED, and wherein the remote IED is adapted to receive the current measured by the transfer IED and the current measured by the local IED, said remote IED adapted to communicate a signal to cause tripping of its associated circuit breaker if the current measured by the remote IED does not equal the currents received from the transfer IED such that tripping of all circuit breakers isolates a fault condition on either the first or second power line. - View Dependent Claims (41, 42, 43, 44)
-
Specification