SYMMETRICAL COMPONENT AMPLITUDE AND PHASE COMPARATORS FOR LINE PROTECTION USING TIME STAMPED DATA
First Claim
1. A method for detecting a fault on a conductor by a first intelligent electronic device (IED) monitoring a power system segment having a first IED and a second IED, comprising:
- obtaining a first set of current measurements;
receiving a second set of current measurements from the second IED;
time aligning the first set of current measurements and the second set of current measurements using a timestamp associated with the second set of current measurements;
calculating a first symmetrical component from the time aligned first set of current measurements;
calculating a second symmetrical component from the time aligned second set of current measurements; and
detecting a fault in the power system segment using the first and second symmetrical components.
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Accused Products
Abstract
A set of current measurements may be transmitted from a remote Intelligent Electronic Device (IED) to a local IED. The current measurements may comprise a timestamp and/or be associated with timestamp information to allow the local IED to time align the local current measurement with the remote current measurement. The local IED may detect a fault within the power system segment defined by the local and remote IEDs by comparing an operating current to a scaled restraint current. A fault may also be detected by comparing the operating current to a scaled nominal current. The operating and restraint currents may be derived from the local and remote current measurements. The restraint current scale may be derived from the characteristics of the local and/or remote IED. The current measurements may correspond to a negative-sequence component and/or a zero-sequence component of a three-phase current measurement set.
119 Citations
26 Claims
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1. A method for detecting a fault on a conductor by a first intelligent electronic device (IED) monitoring a power system segment having a first IED and a second IED, comprising:
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obtaining a first set of current measurements; receiving a second set of current measurements from the second IED; time aligning the first set of current measurements and the second set of current measurements using a timestamp associated with the second set of current measurements; calculating a first symmetrical component from the time aligned first set of current measurements; calculating a second symmetrical component from the time aligned second set of current measurements; and detecting a fault in the power system segment using the first and second symmetrical components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for detecting a fault on a conductor by a first IED in a segment of a power system monitored by the first IED and a second IED, comprising:
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a current sensor to obtain a first set of current measurements at the first IED; a communications interface to receive a second set of current measurements from the second IED, the second set of current measurements comprising a timestamp; a comparator to detect a fault in the segment using only a first set of time aligned current measurements derived from the first set of current measurements and a second set of time aligned current measurements derived from the second set of current measurements. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification