tna transformer
TRANSCRIPT
-
8/9/2019 TNA Transformer
1/16
TransformerTransformer
Maintenance and TestingMaintenance and Testing
Presented By.Presented By.
Muhammad BilalMuhammad Bilal
EEEE--I BlockI Block--IIII
-
8/9/2019 TNA Transformer
2/16
-
8/9/2019 TNA Transformer
3/16
Transformer PrincipleTransformer Principle
Faraday's law of electromagnetic induction.Faraday's law of electromagnetic induction.
E = M di/dtE = M di/dt
-
8/9/2019 TNA Transformer
4/16
-
8/9/2019 TNA Transformer
5/16
TapchangerTapchanger
Voltage of the system can be varied byVoltage of the system can be varied by
changing the turn ratio of transformer. Thechanging the turn ratio of transformer. The
device tapchanger is used for adding or cuttingdevice tapchanger is used for adding or cuttingout turns of primary or secondary winding of aout turns of primary or secondary winding of a
transformer.transformer.
-
8/9/2019 TNA Transformer
6/16
Insulating oilInsulating oil
Insulating oil forms a very significant part ofInsulating oil forms a very significant part oftransformer insulating system and has the importanttransformer insulating system and has the importantfunction of acting as an electrical insulation as well asfunction of acting as an electrical insulation as well as
a coolant to dissipate heat lossesa coolant to dissipate heat losses Insulating oil is hydrocarbon mineral oil consist ofInsulating oil is hydrocarbon mineral oil consist of
four major organic compoundsfour major organic compounds
ParaffinsParaffins
NaphtanesNaphtanes AromaticsAromatics
OlefinesOlefines
-
8/9/2019 TNA Transformer
7/16
Various type of coolingVarious type of cooling
ONAN = oil natural air naturalONAN = oil natural air natural
ONAF = oil natural air forcedONAF = oil natural air forced
OFAF = oil forced air forcedOFAF = oil forced air forced OFWF = oil forced water forcedOFWF = oil forced water forced
ODAF = oil directed air forcedODAF = oil directed air forced
ODWF = oil directed water forcedODWF = oil directed water forced
-
8/9/2019 TNA Transformer
8/16
Buchloz RelayBuchloz Relay
The relay serves as main protection for anyThe relay serves as main protection for any
minor or major faults that may develop insideminor or major faults that may develop inside
a transformer. Such faults always results ina transformer. Such faults always results in
generation of gases which cause the operationgeneration of gases which cause the operation
of mercury switches giving signal for alarm orof mercury switches giving signal for alarm or
isolates the transformer from the network.isolates the transformer from the network.
The relay is mounted in the pipe at anThe relay is mounted in the pipe at an
inclination of 3inclination of 3--77
-
8/9/2019 TNA Transformer
9/16
-
8/9/2019 TNA Transformer
10/16
-
8/9/2019 TNA Transformer
11/16
What to do when BUCHLOZ relayWhat to do when BUCHLOZ relay
operatedoperated BUCHLOZ relay operates due to presence ofBUCHLOZ relay operates due to presence of
gases.gases.
Analyzing the gases dissolved in the oil orAnalyzing the gases dissolved in the oil orcollected from the buchloz relay greatlycollected from the buchloz relay greatly
facilitates detection of fault in the transformer.facilitates detection of fault in the transformer.
-
8/9/2019 TNA Transformer
12/16
NonNon--inflammable gasesinflammable gases
If gases are nonIf gases are non--inflammable then transformerinflammable then transformer
can put back into service as it is due to entry ofcan put back into service as it is due to entry of
air which can be removed by purging.air which can be removed by purging.
-
8/9/2019 TNA Transformer
13/16
Inflammable gasesInflammable gases
Inflammable gases may be due to serious fault.Inflammable gases may be due to serious fault.
It is therefore essential to disconnect theIt is therefore essential to disconnect the
transformer.transformer.
Then measure the acid content. Acidic natureThen measure the acid content. Acidic nature
of gases imply the serious fault in theof gases imply the serious fault in the
transformer.transformer.
-
8/9/2019 TNA Transformer
14/16
Transformer Vector GroupTransformer Vector Group
It shows the angular displacement b/w H.V.It shows the angular displacement b/w H.V.
and L.V. winding.and L.V. winding.
The phase displacement is indicated by theThe phase displacement is indicated by theangle in terms of clock face. The HV vectorangle in terms of clock face. The HV vector
being at 12 o, clock (zero) and thebeing at 12 o, clock (zero) and the
corresponding LV vector at hour hand number.corresponding LV vector at hour hand number.
-
8/9/2019 TNA Transformer
15/16
Standard Vector GroupsStandard Vector Groups
GroupGroup PhasePhase
DisplacementDisplacement
ConnectionsConnections
11 ZeroZero Yy0, Dd0Yy0, Dd0
22 180180 Yy6, Dd6Yy6, Dd6
33 3030 laglag Dy1, Yd1Dy1, Yd1
44 3030 leadlead Dy11, Yd11Dy11, Yd11
-
8/9/2019 TNA Transformer
16/16