Monitoring Breaker Status for Instantaneous Overcurrent using RTAC

HMI and SEL 451Presented

By

Yashashree Wase

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Contents• Objectives• Devices used (Testbed)• Communication architecture • Project implementation• Problems encountered and solved• Project Deliverables

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Objectives• Generate instantaneous overcurrent signals using

SEL adaptive multi-channel source (AMS)• Detect high current using 50P1P instantaneous

overcurrent element pickup in SEL 451 • Establish communication between SEL 451 and RTAC

using SEL proprietary protocol• Display the status of circuit breaker using RTAC HMI

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Testbed

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Adaptive Multi-channel Source (SEL AMS)

SEL 451 Protection Automation Control Relay

Real – Time Automation Controller (SEL RTAC)

Communication Architecture

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Ribbon Cable

Project Implementation

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Generating fault current using AMS• Created the test file to

apply the overcurrent signals using SEL 5401 Relay Test Software. The three states are as shown

• The fault state with 3 Amp current is shown

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Instantaneous Overcurrent Element in SEL 451

• The overcurrent from AMS cause 50P1P pickup.• The threshold value for 50P1P is set to 2 Amps, so 3

Amps from AMS trips the breaker• Asserts OUT101 relay word bit which is then

transferred to RTAC using SEL protocol • It is mapped using tag processor to display breaker

status on HMI

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Instantaneous Fault displayed on SEL 451 HMI

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Event Monitoring

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RTAC Implementation• Connect SEL 451 to RTAC using cable C273A• Use client- serial configuration and tag processor to

map the relay tags to Master station• Configure a serial connection from the RTAC to the SEL

451 using SEL protocol to collect targets and meter data.

• SEL Fast Messaging Protocol is proprietary protocol for serial communication

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RTAC HMI Screen

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Problems Encountered

• Baud rate

• Cable selection

• HMI .binz file

• Firmware update

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Project Deliverables• Demonstrated the components of SCADA : i. Data acquisition

ii. Data transmissioniii. Data processing/display

• Established communication between RTAC and SEL451 using SEL Fast Messaging Protocol

• Displayed a breaker status using RTAC HMI

Thank you!

Your questions are valuable!

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