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The Utility Breaker Tim Heard DDC Engineer AEP Texas SWEDE 2006

The Utility Breaker Tim Heard DDC Engineer AEP Texas SWEDE 2006. Introduction. A Utility Breaker is a spare breaker that can be used as a: Feeder replacement breaker Totalizing breaker Bus tie breaker. History.

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The Utility Breaker Tim Heard DDC Engineer AEP Texas SWEDE 2006

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  1. The Utility BreakerTim Heard DDC Engineer AEP Texas SWEDE 2006

  2. Introduction A Utility Breaker is a spare breaker that can be used as a: • Feeder replacement breaker • Totalizing breaker • Bus tie breaker

  3. History • Mid 1960’s-CPL began installing utility breakers • 1994- Utility breakers removed from substation design standard • Today- 41 Utility breakers available for service in TCC (old CPL) • 0 Utility breakers in TNC (old WTU)

  4. SCADA 1-LINE OUT OF SERVICE Utility CB Out of Service

  5. SCADA 1-LINE AS FDR REPLACEMENT Utility CB as Feeder Replacement

  6. SCADA 1-LINE AS TOTALIZER Utility CB as a Totalizer

  7. SCADA 1-LINE AS BUS TIE Utility CB as a Bus Tie

  8. PICTURE OF SWITCHES

  9. PICTURE OF SWITCHES

  10. PICTURE OF SWITCHES

  11. PICTURE OF CONTROL PANEL

  12. PICTURE OF SELECTOR SWITCH

  13. Relay Transfer Switch

  14. Relay Transfer Switch Operations • Utility Breaker CT secondaries are switched to Utility Breaker overcurrent relays. • Utility Breaker relay trips are switched to Utility Breaker trip coil.

  15. Relay Transfer Switch Operations • Utility Breaker CT secondaries are switched to #3 Transformer Differential Relays and #3 Transformer Totalizing relays. • #3 Differential trips and Totalizing trips are switched to Utility Breaker trip coil.

  16. Relay Transfer Switch Operations • Utility Breaker CT secondaries are shorted. • Utility Breaker overcurrent relay trips remain switched to Utility Breaker trip coil.

  17. Utility Breaker Cost • Installation costs is 40%-50% higher than feeder breaker due to: • 1- Utility Breaker or 2- Feeder Breakers can fit in standard 20’x20’ bay • Breaker, risers, and switches rated for 2000 amps vs. 1200 amps • More cable work for CT and trip circuits

  18. BENEFITS • Huge impact on SAIDI/ CAIDI when dealing with Substation related outages • Time/ Labor savings in switching for routine maintenance

  19. Questions?

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