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J.V. Kelley Xcel Energy System Protection Engineering

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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

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One rack was built as complete line terminal DNP functionality needed to be added Second rack needing to be rebuilt from scratch

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

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

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One line diagram Breaker Status and Control Individual Breaker Pages Breaker Status and Control System Voltage Reclose Enable Carrier Cutoff

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Breaker status Color indicates open or closed Breaker control Double click breaker to bring up open or close commands

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Separate Page for each Breaker Breaker Status and Control Other commands that are used at substations

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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

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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

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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

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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.

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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

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

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TestBKR 1BKR 2BKR 3BKR 4 Issue TripPass FuturePass Issue ClosePass FuturePass Breaker StatusPass FuturePass Bus VoltagePass FuturePass Reclose EnablePass NAPass

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TestBKR 1BKR 2BKR 3BKR 4 Push ButtonsPass LEDPass Trip CircuitPass Close CircuitPass Breaker Status Circuit Pass

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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 werent always easy to find Learning to use DNP map in relays

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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

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

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