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Control and Status of Simulated Breakers Using HMI

J.V. Kelley Xcel Energy System Protection Engineering. Control and Status of Simulated Breakers Using HMI. Objectives. Simulate two line terminal substation in lab For testing, training, and demonstration purposes Use SEL (Schweitzer Engineering Labs) line relays

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Control and Status of Simulated Breakers Using HMI

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  1. J.V. Kelley Xcel Energy System Protection Engineering Control and Status of Simulated Breakers Using HMI

  2. Objectives • Simulate two line terminal substation in lab • For testing, training, and demonstration purposes • Use SEL (Schweitzer Engineering Labs) line relays • Simulate Breaker in Hardware • HMI (Human Machine Interface) • Control, status, and alarms of “breakers” • Learn about: • DNP (Distributed Network Protocol), • SEL RTAC (Real-Time Automation Controller ) • HMI interfaces

  3. System prior to project • One rack was built as complete line terminal • DNP functionality needed to be added • Second rack needing to be rebuilt from scratch

  4. System Overview HMI Display (PC) Mostly Pre-existing Breaker 4 Relay SEL-311C SEL-RTAC DNP Breaker 4 Relay SEL-421 Breaker 1 Relay SEL-421 Breaker 2 Relay SEL- 411L Breaker 3 Relay SEL- 321 Breaker 4 Relay SEL-351S DC Wiring Breaker Sim SEL-421 Breaker Sim SEL-351

  5. System Overview HMI Display DC Supply BKR 4 SEL-311C RTAC BKR 1 SEL-421 BKR 4 SEL-421 BKR 2 SEL-411L BKR 4 SEL-351S BKR 3 SEL-321 BKR 4 Sim SEL-351 BKR Sim SEL-421

  6. HMI Screens • One line diagram • Breaker Status and Control • Individual Breaker Pages • Breaker Status and Control • System Voltage • Reclose Enable • Carrier Cutoff

  7. HMI Screens – One line diagram • Breaker status • Color indicates open or closed • Breaker control • Double click breaker to bring up open or close commands

  8. HMI Screens – Breaker Page • Separate Page for each Breaker • Breaker Status and Control • Other commands that are used at substations

  9. RTAC • SEL-3530 RTAC • Connects to PC via USB or Ethernet • Used DNP over Ethernet to communicate with SEL-421 and SEL-411L relays • Used DNP over RS232 to communicate to SEL-321 relay

  10. New Line Relays • SEL-421, 411L, 321 • System is setup with one line-relay per breaker • Communicates with RTAC via DNP • Trips, closes and receives breaker status via 125 Volt DC discrete circuitry • Used our company standard relay inputs and outputs

  11. Existing Relays • Existing Rack Represents Single Line Terminal • SEL-421 and 311C redundant line terminal relays • SEL-351S breaker relay • Reclosing, Breaker Failure, etc. • Only SEL-421 Communicates to RTAC • DNP Over Ethernet • Trips, closes and receives breaker status via 125 Volt DC discrete circuitry

  12. Breaker Simulation • Used custom logic SEL-421 to simulate four breakers • Reasons for 421 • Availability • Buttons, lights, timers are contained in one unit • Easier wiring than original plan • Programming could be expanded to allow for different failures • Breaker failure, Slow trip, fast reclose, etc.

  13. Breaker Simulation - Wiring

  14. Breaker Simulation - Logic Pushbutton 1: Changes state of outputs and LED OUT201: Breaker Status (52A) OUT205: Opposite state of Out201 IN205: Closes Out201 IN101 or IN201: Opens Out201

  15. Demonstration Videos • Breaker Simulator Relay • https://www.youtube.com/watch?v=pNYTjGcUGc • One Line Diagram on HMI • https://www.youtube.com/watch?v=sALi8z87p4k • Single Breaker HMI Page • https://www.youtube.com/watch?v=J4-1fQuhJW4

  16. Testing – HMI

  17. Testing – Breaker Simulator

  18. Challenges • Choosing hardware and laying out wiring • Obtaining hardware and software • Learning to use the SEL graphical logic to get breaker simulator working • Getting logged in and communicating to all devices • Passwords, baud rates, and IP addresses weren’t always easy to find • Learning to use DNP map in relays

  19. Challenges • Learning about RTAC as absolute beginner • SEL has a helpful video series on YouTube that starts at more basic level than the manual • Getting first status point working from relays • Getting first control point working from relays • Learning to use Diagram Builder • Getting diagram to display

  20. Future • Get DNP to SEL-321 working • Bring back more alarms and statuses to HMI • Add different types of failures to breaker simulator

  21. The end

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