electrical predictive and preventative...
TRANSCRIPT
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Electrical Predictive
and Preventative
Maintenance
Mose Ramieh III – CE Power
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Electrical and mechanical
equipment is subject to
failure, at the worst
possible time, for no
apparent reason.
- Mose Ramieh III
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There are two types of
facilities…
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Those that have HAD a
failure…
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And those that will…
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IEEE 493-2007
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Agenda
• Safety and Maintenance
• Types of equipment failures
• Non-Intrusive Predictive Options
• Somewhat Intrusive Predictive
Options
• Intrusive Options
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Electrical
Maintenance
&
SafetyNFPA 70B, 70E, IEEE
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NFPA 70EStandard for Electrical Safety in the Workplace
– Electrical Arc, Flash, and Blast
– Safe work practices
– Energized Electrical Work Permit
– Minimum PPE Requirements
– Make systems electrically safe prior to work
– Mechanical controls (IR Windows)
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Article 110.4
Multiemployer Relationship
States:
On multiemployer worksites (in all industry
sectors), more than one employer may be
responsible for hazardous conditions that
violate safe work practices.
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Reasons for Electrical
Predictive and
Preventive
Maintenance
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Safety
• To minimize unsafe conditions
• Avoid personnel injuries
• Reliability Centered Maintenance is
directed by safety first, then
economics. When determined that
safety is not a factor, then preventive
maintenance is justified on economic
grounds. IEEE 493-2007 Section 5.5
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Economics
• To avoid future and more costly
equipment failures.
• To avoid premature equipment
failures.
• To avoid interruption of services to
production and processes.
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Legal & Contracts
• Avoid legal consequences and/or to
meet legislated mandates (Codes &
Standards)
• To comply with insurance
company requirements.
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Go Green
• Avoid environmental damage
• Accomplish equipment life
cycle extension.
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Downtime=Money!
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NFPA 70B
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IEEE 493-2007
5.3.2 Causes of Electrical Failure
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IEEE 493-2007
5.3.2 Causes of Electrical Failure
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Insulation Failures
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Mechanical Failures
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Mechanical Failures
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Non-Invasive PdM
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House Keeping
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Walk Through Inspections
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What You Can’t See
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What is Partial Discharge (PD)?
PD is a localized electrical discharge in an
insulation system that does not completely
bridge the electrodes
Phase to Phase
or
Phase to Ground
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What is Partial Discharge?
PMDT Proprietary
Partial Discharge EmissionLightHeatOdor (Ozone)SoundElectromagnetic pulse
Typical PD TypesCorona dischargeFloating dischargeParticle discharge Void discharge Surface discharge
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PD Activity
0
90
180
270
360
Partial Discharge Pulses
Negative Polarity
Pulse in positive half
cycle and Positive
polarity pulse in
negative half cycle
One 60Hz Cycle
V
TEV
signal
(nano
Secs)
-ve
4.1 mS
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Detection Bandwidth
TEV: 3MHz~100MHz
UHF: 300MHz~1500MHz
AE: 20kHz~300kHz
Ultrasonic:40kHz
HFCT: 500kHz~50MHz
ApplicationGISMV switchgearPower cableTransformer
PMDT Proprietary
Level I PD Detection Services
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Level I PD Detection Services
• UHF – Radio Frequency
• TEV – Transient Earth
Voltage (capacitive)
• Ultrasonic (airborne acoustic)
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Typical Retrofit Switchgear Application
Sensor Selection Guideline
RFCT – One for every cable-set (in or out)
Coupling Capacitors – One set for every 3 structures
RFCT
Coupling Capacitors
LEGEND
Load Cables or Bus
Switchgear Cable Compartment
L1 L2 L3
52MV Power Circuit Breaker
Cable Shields
Breaker Cubicle 1 Breaker Cubicle 2 Breaker Cubicle 3 Breaker Cubicle 4 Breaker Cubicle 5 Breaker Cubicle 6
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On-Line Partial Discharge
Continuous Monitoring
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Transformer Oil Samples
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Slightly Invasive PdM
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Thermographic Surveys
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Subject
149.0
Ref.
41.1
*>55.0°F
*<35.0°F
36.0
38.0
40.0
42.0
44.0
46.0
48.0
50.0
52.0
54.0
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Survey Hazards
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IR Windows
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Short Outage PdM
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IEEE 493-2007
5.3.2 Causes of Electrical Failure
• Dirt on moving parts can cause sluggishness
and improper electrical equipment
operations…
• Checking the mechanical operation of
devices and manually or electrically
operating any device that seldom operates
should be standard practice.
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Seldom Operated
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“Traditional” Outage PM
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When to Test?
NETA MTS and NFPA 70B• Monthly
– Visual Inspections
– Make notes regarding operating status and house keeping
• Annually
– Thermographic Survey
– Out of Service Maintenance
• 1-5 Years
– Follow Manufacturer Guidelines
– NETA Guidelines (Handouts Available)
– Check with Insurance Carrier for additional Guidelines.
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Circuit Breaker Testing
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Circuit Breaker Testing
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“New” Vacuum Breaker
Technology
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Breakdown Voltage
61
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62
Penning Diagram and Field Testing
Test Setup using Penning Discharge Principle.
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NFPA 70E Chapter 2 Safety Related
Maintenance Requirements
• Qualified Persons to conduct
maintenance.
• Over-current devices shall be
maintained.
• House keeping, House keeping
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NFPA 70E Chapter 2 Safety Related
Maintenance Requirements
“Failure to properly
maintain protective
devices can have an
adversely effect on
the arc flash hazard
analysis incident
values.”
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Circuit Breaker Testing
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Transformer Testing
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Transformer Testing
• Insulation Resistance
• Winding Resistance
• Turns Ratio Test
• Power Factor (60Hz)
• Leakage Reactance
• On Load Tap Changer
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Power Factor vs Frequency
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Catch it Early or Pay Big $’s Later
Effect:
High temperature and moisture
content will dramatically lower
the mechanical strength of paper
insulation
Risks:
• Lower the expected life of
transformer
• Run transformer at lower rating
Temperature / °C
50 70 90 110 130
0,1
1
10
100
1000
Life
expe
cta
nce
/ a
Dry
1%
2%
3%
4%
L. E. Lundgaard, “Aging of oil-impregnated paper in power transformers”,
IEEE Transactions on Power Delivery, Jan. 2004
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Dielectric Frequency Response
high
low
high
high
low
low
0,001 0,01 1 100
0,001
0,01
0,1
1
1000
Frequency / Hz
Dis
sip
atio
n f
acto
r
0,1 10
mo
istu
re a
nd
a
gin
g o
f ce
llulo
se
insula
tio
ng
eo
me
try
oil conductivity
moisture, aging of cellulose
Sufficient data
Typical:
• Dry transformer or low
temperature
-> 0,1 mHz, 2:50 hours
• Moderate wetness /
temperature -> 1 mHz, 22 min
• Wet transformer or hot
temperature -> 0,1 Hz, 5 min
Freq/Hz0.001 0.01 0.1 1.0 10
Dis
sip
ation
fa
cto
r
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
New
1000
0.002
0.0001
5
Freq/Hz0.001 0.01 0.1 1.0 10
Dis
sip
ation
fa
cto
r
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
1000
0.002
0.0001
5Moderate
44°C
Freq/Hz0.001 0.01 0.1 1.0 10
Dis
sip
ation
fa
cto
r
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
1000
0.002
0.0001
5
Heavily aged
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The General Curve Structure
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Cable Testing
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VLF Cable Testing
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VLF Cable Test Results
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Protective Relays and Meters
• Monthly
– Visual Inspection
– Record and Reset Targets
• Annually
– Pick up Test and Time
Electromechanical Relays
– Verify Setting of Solid State
• 1-5 Years (Out of Service)
– Pick Up Test
– Timing Test
– Verify Operational Scheme
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BEFORE AFTER
• Existing Electro-Mechanical Relays (124); CEPS provided NERC/FERC testing.
• Scope of Work included engineering, design, material, installation, and commissioning.
• Material scope included SEL 300G, 387E.
On-site RetrofillDayton Power &
Light – Killen Station
78
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Data and Oscillographic Records
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Questions?
Answers