ECEn 191 – New Student Seminar - Session 12: Power Power ECEn 191 New Student Seminar.
Seminar on power former
Transcript of Seminar on power former
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Seminar on
Power former- ABreakthrough of high
voltage generators.
By Nazneen kousar.
Guided by: Asst. prof. Arathi P.B
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Contents-
Objective. Function.
Cable construction.
New design. Field distribution.
Abnormal situations.
Cooling ways. Comparison.
Merits and de-merits.
Applications.
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Objective :
To introduce a device which providesdirect connection to power grid with-out an intervening step-up transformer.
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What is power former ?
Generator transformer power former
Power former is same as generator the only
difference being in its construction.
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Pictorial representation-
1.Generator
2.Generator circuit
breaker
3.Surge arrestor
4.Transformer
5. Circuit breaker
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Cable construction-
1. Cable strands.
2. Inner-semiconducting
layer.
3. Solid Insulation.
4. Outer-semiconductinglayer.
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Stator design-
(a) 1-rotar, 2-section of stator, 3-teeth,
4-slots, 5-main winding cable, 6-auxillary
winding.
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(Stator design cntd.)
Stator slot teeth arebroader.
Slots consists ofcylindrical bores
arranged radially.
Each winding requiresless cable insulation
Winding features highvoltage and low current.
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Field distribution-
Circular
conductors have
uniform field
distribution.
Output power is
increased in-turn.
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Features of XLPE cables-
Cross-linked polyethylene, orXLPE, is a
form of polyethylene with cross-links.
higher conductor rating of 90 degreeC.
Have greator continuos and short
circuit current capacity.
"Super Clean Material Supplying
System."
http://en.wikipedia.org/wiki/Polyethylenehttp://en.wikipedia.org/wiki/Cross-linkhttp://en.wikipedia.org/wiki/Cross-linkhttp://en.wikipedia.org/wiki/Cross-linkhttp://en.wikipedia.org/wiki/Cross-linkhttp://en.wikipedia.org/wiki/Polyethylene -
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Cooling system-
Cooling done at zero potential.
Tap water can be used.
XLPE pipes used axially.
No radial duct.
Less risk of short circuit.
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During abnormal conditions -
Two or three phase
faults occuring are
much lower.
Single phase faults are
of low magnitude
compared toconventional
generators.
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Comparison with
conventional system
Improved over-loading capabilitycomparingly.
More reative power output.
Highly compact insulated cabling.
Possesing less components.
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Differential protection-
Winding cables can be considered as
capacitor.
The machine adopts graded insulation.
Use of self- adaptive compensation
methodology.
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Merits-
High energy efficiency.
Comparingly Much reliable.
Continous operation.
Low operating temperatures.
Lower environmental impact.
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De-merits-
Large volume required.
Much expensive.
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Applications-
A turbo generator with rated voltage of
136kv and a capacity of 40MVA.
Hydro generator with rated voltage of 155kvand a capacity of 75MVA.
Another Hydro generator with rated voltageof 78 kV and 25 MVA rating.
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Use of XLPE cable in hydro power
former
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Cable being threaded through thebores in porjus stator.
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Conclusion-
Revolutionizing an century old power
generation convention.
A long term development plan calls forpower former with rated voltage of 500kv.
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References -
M.Leijon,L.Gertmar, breaking conventions inelectrical power plant.
M.Leijon, Power former- A radically new rotating
machine.
Q.Tian, X.Lin, and P.Liu, A novel self adaptivecompensation method.
F.Owman and T.Karlsson Power former:A Giantstep in power plant engineering.
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queries??????
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Thank you