Systems and methods for verifying protective relay output contact operation
AssigneeSchweitzer Engineering Laboratories, Inc.
InventorsAustin Edward Wade, Brandon Michael Nafsinger, David Schmidt, Jordan Bell
Life of this patent
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Abstract
Systems, methods, and devices presented herein are directed toward verifying the operation of protective relays in an electric power delivery system. To protect components of the power delivery system, a protection system may be implemented. The protection system may include a relay containing an output contact, a voltage sensor coupled to the output contact, and a current sensor coupled to the output contact. The protection system may also include processing circuitry used to determine the operation of the output contact based on an indication from the voltage senor, the current sensor, or both.
Claims20
A protection system comprising:
- a first relay, comprising:
- a first output contact;
- a first voltage sensor coupled to a first input of the first output contact and a first output of the first output contact;
- and
- a first current sensor coupled to the first output of the first output contact;
- and
- processing circuitry configured to determine that the first output contact is operational based on a first indication received from the first voltage sensor, a second indication received from the first current sensor, or both.
A tangible, non-transient, computer-readable medium comprising instructions that, when executed by a data processing system, cause the data processing system to:
- send, to a first relay, a first indication that an output contact of the first relay is to activate;
- determine that a trip window has activated;
- receive, via a current sensor coupled to an output of the output contact, a second indication of a current through the output contact;
- determine, based on the second indication, that the current through the output contact exceeds a current threshold;
- and
- transmit a notification that that the output contact has activated successfully based on determining that the current through output contact is above the current threshold.
A relay, comprising:
- an output contact;
- a voltage sensor coupled to an input of the output contact and an output of the output contact within a housing of the relay;
- and
- a current sensor coupled to the output of the output contact within the housing of the relay.
Dependencies are inferred from the claim text.