First trip analysis
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First Trip Analysis. Chugach Electric. Presented by: Steven Cannon, Substation Lineman. Chugach Overview. Alaska’s largest electrical utility Provides generation, transmission, and distribution services Generation mix 90% gas, 10% hydro 65,000 members. Chugach System. 230kv-12.4kv lines

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First Trip Analysis

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First trip analysis

First Trip Analysis

Chugach Electric

Presented by:

Steven Cannon, Substation Lineman


Chugach overview

Chugach Overview

  • Alaska’s largest electrical utility

  • Provides generation, transmission, and distribution services

  • Generation mix 90% gas, 10% hydro

  • 65,000 members


Chugach system

Chugach System

  • 230kv-12.4kv lines

  • 50 substations and switchyards

  • 87 power transformers

  • 323 circuit breakers


Alaskan rail belt

Alaskan Rail Belt

  • The Alaska Railbelt system

    • Electrically Islanded

  • The Railbelt system

    • 850 MW Peak

    • Four generation areas: Fairbanks, Anchorage, Beluga, and the Kenai Peninsula.

  • The Anchorage area

    • Anchorage and Beluga generation

    • Tied to both the Fairbanks and Kenai Peninsula systems through single transmission ties

    • 138 kV tie north to Fairbanks

    • 115 kV tie south to the Kenai.


Why first trip analysis

Why First Trip Analysis?

  • Analyze breakers “in the field” condition


Lubrication

Lubrication

  • Grease is composed of soap and oil

  • Oil provides lubrication

  • Soap gives consistency to hold lubrication

  • Oil eventually separates from the soap

  • Time causes soap to harden and gum up

  • Harden soap slows down breakers


Advantages of capturing first trip

Advantages of Capturing First Trip

  • Breaker can be tested in energized state

  • Test can be performed in about 10 minutes

  • Overlay breaker operations


Qualifications for operator

Qualifications for Operator

  • Know how to read breaker control schemes

  • Be qualified to switch

  • Be computer literate

  • Understand safety rules for working in a substation


Connections

Connections


First trip analysis

latch

Trip Coil Plunger


Interpreting graphs

Interpreting Graphs


Breaker 1616

Breaker 1616


Breaker 1616 dc prints

Breaker 1616 DC Prints

CC Amp Probe

DC (+)

DC (-)

TC Amp Probe


First trip analysis

DC Leads

CT Leads


Main bearings

Main Bearings


Latch bearing

Latch Bearing


Breaker 1616 results

Breaker 1616 Results


Important tips

Important Tips

  • Change batteries often

  • Come to the breaker prepared

  • Label wires to apply leads

  • Catch the first trip

  • Catch multiple breaker operations

  • Save each shot before moving the Profile

  • Periodically upload shots to computer

  • Develop a backup plan


First trip analysis

Questions?


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