sdmyers carilec transformer maintenance and reliability
TRANSCRIPT
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Transformer Maintenance
and Reliability
Aris Peña, CRL Senior Business Development
Manager
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• Introduction
• Maintenance, aging
and testing
• Life-extension services
• Moisture reduction
• Reliability
• Conclusions
Content Overview
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• Maintenance and reliability
are inseparable
• Influencing factors in
maintenance decisions
• Maintenance and monitoring
methods
Introduction
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Maintenance, Aging and Testing
Corrective Maintenance
Reacting to problems when they occur
Preventive Maintenance
Routine repairs and maintenance
Predictive Maintenance
Utilizes trending data for optimal performance
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Maintenance, Aging and Testing
Life of transformer = Life of paper
Oxidation attacks and
destroys paper
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Life-extension Services
Acid level in oil: Data from 5,000+ transformers
Non-serviced group: Elevated acid levels
Average acid level: 0.11 mg KOH/g
Serviced group: Oil reclamation had been performed
Average acid level: 0.03 mg KOH/g
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0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0 10 20 30 40 50 60 70 80 90 100
Aci
d N
o. (m
g K
OH
/g)
Age (Years)
Acid Number as a function of Age(5,839 oil-filled transformers >500 kVA)
Non-serviced (1,675)
Serviced (4,164)
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Life-extension Services
Acids attack insulating paper
Insulating paper loses tensile strength
The paper is irreversibly weakened
WHEN PAPER STRENGTH
DECREASES, THE RISK
OF FAILURE INCREASES
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750x Magnification
Acid’s Effect on Paper: 0.05% Acid
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750x Magnification
Acid’s Effect on Paper: 0.30% Acid
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Life-extension Services
Study of 1,534 oil-filled transformers
Oil services include…
• Reclamation
• Moisture Reduction
• Oxidation Inhibitor Restoration
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Life-extension Services
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Moisture Reduction Passive online drying systems
Specs: 38,000 liters
Primary: 345 kVA
Secondary: 154 kVA
Duration: 12 months on 11 months off
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Reliability Looking to the future
A contingency plan is essential
• Spare transformer
• Double-connected
substation
• Available rental
• Mobile substation
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Reliability
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Reliability
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Reliability
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Reliability
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Reliability
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DGA Monitoring
Reliability
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• Degassing
• Removal of Acid and Sludge
• Moisture Reduction
• Processing | Equipment
• Fault Gas Monitoring
• Inspection and Repair
• Regasketing
• Full Electrical Testing
Reliability Actions Transformer PM and PdM Strategies
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DGA Monitoring
• 1-gas monitor
Hydrogen present in most faults
• 8-gas monitor
Very effective solution
Higher-budget applications
• Intuitive data presentation
• Complete data management system
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Data Management Transformer Dashboard®
Mechanical and
Maintenance
Fluid
Analysis
Health
Center
Monitor
Data
ET and IR
Data
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Assessing risk is essential to securing a
reliable electrical system
Aging infrastructure demands an ambitious
maintenance strategy
Proactive steps contribute to valuable
uptime and life extension
Conclusions
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Aris Peña Business Development
Representative
Thank you!