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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)
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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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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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