potential damage short circuit or synch outta phase · 2019-07-25 · agts ervices, inc. generating...
TRANSCRIPT
![Page 1: POTENTIAL DAMAGE SHORT CIRCUIT or SYNCH OUTTA PHASE · 2019-07-25 · AGTS ervices, Inc. Generating timely repair solutions ANSI C50.13 paragraph 4.2.4.1 •Suffer minimal damage](https://reader033.vdocuments.us/reader033/viewer/2022042014/5e737c7d03cf9165fb57d16b/html5/thumbnails/1.jpg)
AGTServices, Inc.Generating timely repair solutions
POTENTIAL DAMAGE
SHORT CIRCUIT or
SYNCH OUTTA PHASE
Mike Bresney
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AGTServices, Inc.Generating timely repair solutions
ANSI C50.13 paragraph 4.2.4.1
•Suffer minimal damage after experiencing short circuit forces.
–Suitable for service with minor repairs.
•No bar / coil replacement
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AGTServices, Inc.Generating timely repair solutions
Operational and Maintenance History
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AGTServices, Inc.Generating timely repair solutions
Operational and Maintenance History
4250 kva
13.8 kv
1778 phase amps
6.7 PU current
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
End Winding Broken Ties
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AGTServices, Inc.Generating timely repair solutions
Damage due to Phase – Phase Fault
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AGTServices, Inc.Generating timely repair solutions
End Turn Elongation
End winding following external Phase – Phase Fault
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AGTServices, Inc.Generating timely repair solutions
Appears to be End Turn Elongation
Temperature Increase
Identifies
Fault Location
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AGTServices, Inc.Generating timely repair solutions
Core following Phase to Phase Burning
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AGTServices, Inc.Generating timely repair solutions
Melted
Conductors
Due To Phase
to Phase
Current
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AGTServices, Inc.Generating timely repair solutions
Melted Core
Due To Phase
to Phase
Current
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AGTServices, Inc.Generating timely repair solutions
GE 7EA GT with
7A4 Air Cooled Generator
–Mfg ~1989
–COD ~1990
• Rating Info
–104 MVA
–13.8 kV
–4,351 Phase Amps
–72 Slots
–Natural Gas Peaking
Unit
–3,600 RPM
–375 V, 629 Amps (Field)
–Open Ventilated Air
Cooled
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
Damage due to Phase – Phase Fault
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
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AGTServices, Inc.Generating timely repair solutions
Core Iron Damage – CE from
Field Removal
TE Retaining Ring and
Contamination
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AGTServices, Inc.Generating timely repair solutions
Field Body Heating
and Contamination
TE Carbon/Soot
Under RR
Some copper found
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AGTServices, Inc.Generating timely repair solutions
Global or Local Ground Condition
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AGTServices, Inc.Generating timely repair solutions
Global Slot
Armor
Contamination
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AGTServices, Inc.Generating timely repair solutions
FAILURE / DAMAGE CONTRIBUTORS
• Not so robust end winding system
–Design
–Lack of maintenance
• Aged insulation
• Fault current levels
• Fault duration
• Multiple re-start attempts after fault
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AGTServices, Inc.Generating timely repair solutions
ANSI C50.13 paragraph 4.2.4.1
•Suffer minimal damage after experiencing short circuit forces.
–Suitable for service with minor repairs.
•No bar / coil replacement
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AGTServices, Inc.Generating timely repair solutions
TO MINIMIZE POTENTIAL FOR
CATESTROPHIC DAMAGE
• Robust end winding system by design
• Good maintenance practices
• Inspect & test after every event
–Phase to phase
–Synch out of phase
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AGTServices, Inc.Generating timely repair solutions
24 Sam Stratton Road
Amsterdam, NY 12010
518-843-1112