Schweitzer Engineering Laboratories, Inc.

David J Casebolt

David E Whitehead

Edmund O Schweitzer, Iii

Krishnanjan Gubba Ravikumar

Austin Edward Wade

Tony J Lee

Gregary C Zweigle

Lisa Gayle Nelms

Bruce A Hall

Sean D Robertson

Nicholas C Seeley

Peter S LaDow

Brian R Clark

David Schmidt

Kelsey M Loughlin

The present disclosure pertains to systems and methods for monitoring electrical arc events in an electric power system. In one embodiment, a system may comprise an arc flash detection (AFD) unit to detect electromagnetic radiation generated by an electrical arc event, a primary protection relay to generate measurements of an electric current, and an integrator. In various embodiments, the integrator may comprise a communication port to receive the detection of the electrical arc event and the measurements of the electric current. The integrator may also comprise a processing subsystem to validate the detection of the electrical arc and generate protective actions to interrupt the flow of the current to the electrical arc event.

Electrical arc event detection in an electric power system

Systems and methods for testing a protection relay, such as a primary bus protection relay, may include a testing device for providing current signals imitating current on both sides of a bus to the primary bus protection relay. The signals may be provided using signals corresponding with a signal format from merging units or other monitoring devices. The testing device may be configured to receive communications from the primary bus protection relay for evaluation of the operation of the primary bus protection relay.

Testing device for protective relays in electric power delivery systems

The present disclosure pertains to devices, systems, and methods for monitoring an electric power system. In one embodiment, a system may detect a failure in an electric power system. The system may include a communication interface to receive a first indication related to a condition in the electric power system, and a second indication related to the condition. The system may also include a test subsystem to compare the first indication to the second indication and to determine a discrepancy between the first indication and the second indication. A diagnostic subsystem may identify the failure based on the discrepancy between the first indication and the second indication. An alert subsystem may generate an alert based on the failure.

Equipment failure detection in an electric power system

Systems and methods may maintain protection of electric power delivery systems in the event of an attack on protection and/or control features of the power system. Primary protective functions may be physically isolated from other functions in primary protection relays. Integrators may facilitate non-primary protection functions and disconnect all communication with primary protection relays in the event of an attack. Primary protection relays maintain protection functions even during the attack or unavailability of the integrators.

Secure electric power delivery system protection during cyber threats

The present disclosure pertains to systems and methods for generating a waterfall display to display a stream of high-speed data measurements. In one embodiment, a system may comprise a communication subsystem to receive a stream of high-speed data measurements. A waterfall generation subsystem may receive the stream of high-speed data measurements from the communication subsystem and identify a plurality of changes in the stream of high-speed data. A subset of data measurements may be selected that includes changes in the high-speed data. The changes may be highlighted through a plurality of modifications. A representation of the subset of data measurements in which changes are highlighted may be generated and presented at a rate below a perception threshold of a human operator. A waterfall display subsystem may generate a human-perceptible waterfall display to represent the stream of high-speed data measurements and the plurality of modifications.

Waterfall display for high-speed streaming measurements

Disclosed herein are systems for maintaining protection of electric power delivery systems in the event of a control power failure or other anomaly. A reliable power module conditions electric power from multiple independent sources and provides electrical operational power to electric power delivery system protective loads. The reliable power module includes an energy storage device for providing operational power even upon loss of all control power sources. The energy storage may be sufficient to ride through expected losses such as a time to start up backup generation. The energy storage may be sufficient to power a trip coil. Thus, electric power system protection is maintained even upon loss of control power. A discharge circuit is provided to allow an operator to de-energize an energy storage device.

Redundant power module and discharge circuit for improved substation device availability

Disclosed herein are systems for maintaining protection of electric power delivery systems in the event of a control power failure or other anomaly. A reliable power module conditions electric power from multiple independent sources and provides electrical operational power to electric power delivery system protective loads. The reliable power module includes a power storage device for providing operational power even upon loss of all control power sources. The power storage may be sufficient to ride through expected losses such as a time to start up backup generation. The power storage may be sufficient to power a trip coil. Thus, electric power system protection is maintained even upon loss of control power.

Reliable power module for improved substation device availability

Electrical power machines are monitored and a loss-of-field event is determined thereof using time stamped mechanical conditions and electrical conditions. The mechanical conditions may include rotational position, calculated and time stamped rotational frequency, valve position, temperature, or vibration. The time stamped electrical conditions may include electrical power system frequency, electrical power machine field data, electrical power machine terminal information such as voltage and current, and the like. Electrical and mechanical time-stamped electrical power machine data from different machines that may be local or remote from each other may be compared for monitoring the machines.

Synchronous machine monitoring and determination of a loss-of-field event using time stamped electrical and mechanical data

Provided is a system, apparatus, and method for evaluating a variety of protocols on a computer network which includes a plurality of network devices. The network devices are adapted to communicate messages on the computer network using their respective protocols. The present invention system, apparatus and method are associated with one of the network devices. The present invention system, apparatus and method are further adapted to identify the various protocols on the network and analyze each message on the network to determine the protocol associated with the message. In another aspect of the present invention, the system and apparatus are adapted to determine whether to communicate a message to the associated network device based on this identification and analysis the message. The present invention embodiments allow for mixed mode communication on a single network.

System, apparatus and method for mixed mode communication on a single network

The system for synchronous sampling uses an encoded time signal, such as an IRIG-B signal. The IRIG-B signal is applied to an edge detector, which produces pulses based on the edges of the encoded time signal. These signals are applied to a phase-locked-loop assembly which is arranged to produce an output sampling synchronization signal which is locked to the transitions in the encoded time signal, providing a synchronous control signal for data sampling of input signals to a plurality of electronic instruments, in addition to the use of the IRIG-B signal as time-of-day clock synchronization for the plurality of instruments.

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Moscow, ID, United States of America

David J Casebolt