Transformers THE INFLUENCE OF MOISTURE, AIR AND · PDF fileGSU Transformer Manufacturing Year...
Transcript of Transformers THE INFLUENCE OF MOISTURE, AIR AND · PDF fileGSU Transformer Manufacturing Year...
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 1
Power Transmission and Distribution
Transformers
Ageing of Solid Transformer InsulationAgeing of Solid Transformer Insulation
THE INFLUENCE OF MOISTURE,
AIR AND OIL-TYPE
ON THE AGEING OF SOLID
INSULATION IN TRANSFORMERS
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 2
Power Transmission and Distribution
Transformers
Ageing of Solid Transformer InsulationAgeing of Solid Transformer InsulationAgeing Factors & Ageing MechanismsAgeing Factors & Ageing Mechanisms
Primary Ageing Factors
• Air
• Moisture
• Temperature
• Electrical Stress
• Contamination
Oil + Paper
Ageing ProductsAcids +
Sludge +
Moisture
Ageing
Feedback
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 3
Power Transmission and Distribution
TransformersDP = 800
DP = 200
Ageing of Solid Transformer InsulationAgeing of Solid Transformer InsulationAgeing of PaperAgeing of Paper
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 4
Power Transmission and Distribution
Transformers
GSU Transformer
Manufacturing Year 1996, Picture 2002
Oxidation processes lead to sludge formation with non-inhibited oils at normal operating service temperatures
Ageing of OilAgeing of Oil
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 5
Power Transmission and Distribution
Transformers
ROLE OF CHEMICAL ENVIRONMENT ROLE OF CHEMICAL ENVIRONMENT
ON THE AGEING PROCESSES AT TRANSFORMERON THE AGEING PROCESSES AT TRANSFORMER
SERVICE TEMPERATURESSERVICE TEMPERATURES
ROLE OF MOISTURE ROLE OF MOISTURE
WHAT DO WE KNOW NOW?
Ageing of Solid Transformer InsulationAgeing of Solid Transformer Insulation
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 6
0
0,2
0,4
0,6
0,8
1
1,2
0 2 4 6 8 10
Time (months)
DP/
DPo
Power Transmission and Distribution
Transformers
1% moisture
4% moisture
10% moisture Additional moisture
ingress
Development of DP with time at different starting moisture contents at 95°C.
Ageing of Solid Transformer InsulationAgeing of Solid Transformer InsulationRole of Moisture Role of Moisture
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 7
Power Transmission and Distribution
Transformers
ROLE OF CHEMICAL ENVIRONMENT ROLE OF CHEMICAL ENVIRONMENT
ON THE AGEING PROCESSES AT TRANSFORMERON THE AGEING PROCESSES AT TRANSFORMER
SERVICE TEMPERATURESSERVICE TEMPERATURES
ROLE OF MOISTURE & AIRROLE OF MOISTURE & AIR
WHAT DO WE KNOW NOW?
Ageing of Solid Transformer InsulationAgeing of Solid Transformer Insulation
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 8
Power Transmission and Distribution
Ageing of Solid Transformer InsulationAgeing of Solid Transformer InsulationAgeing of Kraft Paper Ageing of Kraft Paper ––Influence of Air or/and Moisture Influence of Air or/and Moisture
Thermal Behaviour of Kraft Paper under the Influence of Air and Moisture at 115°C
0
200
400
600
800
1000
1200
1 2 3
Time (Months)
DP
Moisture + Air
Air, no Moisture
Moisture, no Air
no Moisture, no Air
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 9
Power Transmission and Distribution
AgeingAgeing of Paperof PaperAgeing of Solid Transformer InsulationAgeing of Solid Transformer InsulationComparison Thermally Stabilized Paper & Kraft Paper Comparison Thermally Stabilized Paper & Kraft Paper
Thermal Behaviour of Kraft and Thermostabilized Paper under the Influence of Air and Moisture at 115°C
0
200
400
600
800
1000
1200
1 2 3
Time (Months)
DP
Moisture + Air
Air, no Moisture
Moisture, no Air
no Moisture, no Air
Moisture + Air
Air, no Moisture
Moisture, no Air
no Moisture, no Air
Kraft Paper
Thermally Stabilized Paper
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 10
Power Transmission and Distribution
Transformers
Ageing of Solid Transformer InsulationAgeing of Solid Transformer InsulationInfluence of the Insulation Fluid Influence of the Insulation Fluid
Development of DP with time at 115°C in Midel 7131
0
200
400
600
800
1000
1200
1 2 3
Time (months)
DP
Moisture + Air
Air, no Moisture
Moisture + Air
Air, no Moisture
Kraft Paper
Thermally Stabilized Paper
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 11
0
0,0005
0,001
0,0015
0,002
0,0025
0,003
0 1 2 3 4 5 6
Time (Months)
1/DP
Power Transmission and Distribution
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Non inhibited oil, air
Inhibited oil, air
Non inhibited oil, absence of air
Progress of Ageing (DP), Effect of Air, Inhibitor (85°C, 4% moisture in pressboard)
Ageing of Solid Transformer InsulationAgeing of Solid Transformer InsulationInfluence of the Insulation Fluid Influence of the Insulation Fluid
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 12
Power Transmission and Distribution
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Ageing of Solid Transformer InsulationAgeing of Solid Transformer Insulation
Summary• Humidity in the solid material and contact of Oil to the Air accelerate the ageing process
• The primary moisture content determines the slope of aging especially in the first time
• Thermally Stabilized Paper shows a better aging behavior than Kraft Paper under the influence of Humidity and/or Air
• The influence of primary Humidity inside Paper is lower in Ester-Fluids than in Mineral oil due to the better moisture absorbing behavior of the Ester-Fluid
• Inhibited Oil shows lower ageing of the solid insulation under the influence of air than non-inhibited oil
Further information see report of
CIGRE Task-Force TF D1.01.10 - Paper Ageing Paris Session 2004
Convener: Lars Lundgaard
Siemens AG, PTD T Höhlein / Heinzig IEEE Transformers Committee Meeting, Jackson (MS) March 2005 - Foil 13
Power Transmission and Distribution
Transformers
Ageing of Solid Transformer InsulationAgeing of Solid Transformer Insulation
Thank You For Your Attention