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Electrical Maintenance Workshop
Transformer Maintenance & Testing
Thursday, November 6, 2003
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Transformer Maintenance & TestingPurpose
This presentation provides an overview of the major considerations associated with Transformer Maintenance and Testing.
Barker Edwards will provide the information for Transformer Maintenance & Testing.
Kate Brady will provide the information for Transformer Oil Testing.
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Transformer MaintenanceThings to know!
Things you should know about keeping your transformer healthy!
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Transformer MaintenanceAgenda
Types of transformersYearly checksTesting of transformersVacuum pressure devicePressure relief deviceSudden pressure relayGasketsPaints
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Transformer MaintenanceTypes of transformers
Dry type transformers
Varnished coils
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Transformer MaintenanceTypes of transformers
Dry type transformers
Cast coils
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Transformer MaintenanceType of transformers
Oil filled transformers
Sealed tank
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Transformer MaintenanceType of transformers
Oil filled transformers
Conservator system
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Transformer MaintenanceType of transformers
Oil filled transformers
Nitrogen blanket
Pressure regulator for Nitrogen Blanket transformer
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Transformer MaintenanceYearly transformer checks
Check vacuum pressure gauge for pressure reading.Check oil level.Check temperature maximum and minimum.Check for leaks.Check paint condition.Check transformer top and radiators for foreign material.Check radiator condition.Check fans and cooling systems.
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Transformer MaintenanceTesting of transformers
Megger test
600 megohms or better to ground is a good bench mark.
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Transformer MaintenanceTesting of transformers
Power factor test or “Doble” test
Readings should be .5% or less on newer equipment.
Readings should be 1% or less on older equipment that has been in service for a number of years.
Padmount transformers will usually run .7% to 1%.
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Transformer MaintenanceTesting of transformers
Infrared test
This equipment checks for hot connections and hot spots.
Can be used to check how the cooling is working on transformers.
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Transformer MaintenanceTesting of transformers
TTR test - Transformer Turns Ratio test
3 phase TTR set Single phase TTR set
- Readings should not deviate more than ½ of 1% from the calculated value.
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Transformer MaintenanceVacuum pressure devices
Vacuum pressure devices
Used to control the amount of positive and negative pressure a transformer tank has on it.
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Transformer MaintenancePressure relief devices
Pressure relief devices
Used to relieve pressure build up in the transformer.
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Transformer MaintenanceSudden pressure relay
Sudden pressure relay
This device detects a sudden rise in pressure in the transformer.
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Transformer MaintenanceGaskets
Gaskets shall be 1.33 times the height of groove and .75 times the width of the groove.
Types of gasket material:
Cork / CorkpreneNitrile / Buna N RubberViton Rubber
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Transformer MaintenancePaint
Types
Acrylic enamelEpoxy base
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Break
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Transformer Oil TestingAgenda
Transformer oilOil samplingOil qualityDissolved gas analysisCellulose insulationOil processing
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Transformer Oil TestingTransformer oil
Silicon based oil
Mineral oil
Synthetic oils
Ester / vegetable oils
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Transformer Oil TestingOil sampling
A Test is Only as Good as the Sample!Start with good, clean syringes!
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Transformer Oil TestingProper oil sampling
Do Not use small sampling port on side of drain valve.
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Transformer Oil TestingProper oil sampling
Flush drain valve, tubing, and syringe.
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Transformer Oil TestingProper oil sampling – (continued)
Do not pull back on the syringe barrel – apply slight resistance and allow fluid pressure to fill syringe.
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Transformer Oil TestingProper oil sampling – (continued)
Filled syringe should have no bubbles, but some may form later – do not release these!
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Transformer Oil TestingProper oil sampling – (continued)
Excellent Sampling Guidelines available on Doble Engineering website
www.Doble.comClick on “Laboratory Services”Sampling Guides:
Dielectric LiquidsDissolved Gas Analysis ©2002 Doble Engineering Company All Rights Reserved
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Transformer Oil TestingOil quality
Interfacial tension
Acidity
Moisture
Dielectric
Power factor
Color
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Transformer Oil TestingInterfacial Tension - IFT
Measure of contamination
Decreasing IFT = Increasing Contamination
Can be corrected
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Transformer Oil TestingAcidity
Measure of oxidation
Creates acidic compounds
Build-up of compounds forms sludge
Affects dielectric and cooling
Can be corrected
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Transformer Oil TestingMoisture
Decreases dielectric
Decreases IFT
Degrades cellulose
Failure risk
Can be corrected
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Transformer Oil TestingDielectric breakdown
Voltage at which the oil begins to conduct
Is reduced by moisture and contaminants
Two ASTM test methods:
D-877
D-1816
Can be corrected
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Transformer Oil TestingPower factor
Indication of contamination and/or deterioration
moisturecarbonvarnishsoapsother conducting matter
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Transformer Oil TestingColor
Higher Number Darker OilDarker Oil More Contamination, DeteriorationOil with Number of 5 is almost black
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Transformer Oil TestingDissolved gas analysis
DGA is the “blood test” for a transformer
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Transformer Oil TestingDissolved gas analysis
Partial discharge (Corona - “electrical rust”)Hydrogen H2
High temperature heatingMethane CH4, Ethane C2H4, Ethylene C2H6
ArcingAcetylene C2H2
Cellulose involvedCarbon monoxide C0, and Carbon Dioxide CO2
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Transformer Oil TestingCellulose insulation
The Life of the Transformer is directly related to the condition of the cellulose
Paper – windings, leads, shields
Pressboard – spacers, blocks, oil flows, tubes
Particle boards – supports
Laminates – structures, supports
Wood - structure
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Transformer Oil TestingPaper
Many layers of paper on this flux shield
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Transformer Oil TestingPressboard
Pressboard Sheets for directing oil flow
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Transformer Oil TestingPaper and pressboard
Paper wrapped windings
Pressboard spacers
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Transformer Oil TestingParticle board
Particle Board Lead Support that flashed over
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Transformer Oil TestingLaminates
Laminate Nuts
Laminate lead support structure members
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Transformer Oil TestingWood
Birch Structure Support Members
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Transformer Oil TestingThe Cellulose Polymer Chain
The life of a transformer is directly related to the condition of this polymer chain.
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Transformer Oil TestingDegree of polymerization
Measure of mechanical strength
New paper = 1000 – 1400
Age increases DP decreases
Industry accepted “End of Life” of cellulose
insulation is about 200
Estimated DP from Furan test
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Transformer Oil TestingWhat degrades the cellulose?
Primary sources
HeatMoistureOxygen
Secondary sources
Acids from oil oxidation
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Transformer Oil TestingWhy is this important?
Reduced dielectric strength
Unable to withstand voltage stress from system transients
Reduced mechanical strength
Unable to withstand mechanical stress from system faults
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Transformer Oil TestingWhat can we do about it?
Keep the Transformer Healthy!Do not overheatKeep moisture and oxygen out
If the Transformer is Sick, Get Help!Investigate abnormal DGA resultsProcess or replace the oilDe-hydrateHot oil flush
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Transformer Oil TestingTransformer oil processing
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Transformer Oil TestingWhat processes?
De-gas
Dehydrate
Hot oil flush
Reclaim oil
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Transformer Oil TestingOther maintenance options
Upgrades to oil preservation systemBladdersDe-hydrating breathersN2 blanket
On-line monitoring systemsGas and moistureBushing monitors
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Avoid Premature Failure!