PFIFFNER Deutschland GmbH · Density Monitor Testing Device ... Extremly space saving. ... The...
Transcript of PFIFFNER Deutschland GmbH · Density Monitor Testing Device ... Extremly space saving. ... The...
Gasisolierte Messwandler NEU.pptx Streland erstellt 2017-05-09 / Seite 2 / 12.06.2017
SF6 = Sulphur Hexafluoride
- Non toxic
- Inert ( like a noble gas )
- High dielectric strength
- Thermal and chemical stability
- Long-term prooven and tested
Insulation Principle: Electronegativity
( System „Pacman“ )
THE GAS:
THE TRANSFORMER: OUTDOOR ( AIS )
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EGF 245…550 kV
Tank Type Voltage Transformer
JGF 245…550 kV
Head Type Current Transformer
EJGF 245…550 kV
Combined Transformer
Transformer Types
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Head Type Current Transformer
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Primary Coil
Stacked Core
Seconrary Coil
Secondary Coil
Voltage Transformer Part ( Combined Transformer )
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Voltage Transformer
Current Transformer
Current Transformers Support
Arrangement Combined
Transformer
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Current Transformers Support
Primary Reconnection 2 Windings for max. 4000 A using Aluminum conductors
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Head Housing for 1:2:4
Primary Reconnection 4 Windings
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Principle Arrangement For The 1:2:4 Reconnection
Primary Conductors
Return Conductor
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X-Ray Tank Type Voltage
Transformer EGF 420
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20°C 70°C
Rated Pressure PD =
Designpressure
Routine Test
Pressure
2 x PD
Bursting Pressure
5 x PD ( Type Test )
Rated Pressure
Bursting Disc
Pressure Coordination
Routine Test ( EACH PART )
Bursting Test ( Type-Test )
Rated Pressure Of The Bursting Disc
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Pressure Relief: Metallic-Bursting Disk, Rated Pressure Pe=10 bar
No installation flaws by forced centering of the disc and the flange
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Standard:
Density Monitor
Temperature Compensated
Pressure Gauge
Conventionally with display
as shown – or fully electronic
Two pairs of signal contacts
for the pressure alarm
signal
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Density Monitor Testing Device
Dismantling the density monitor for
testing is not required by using the
test device
Gasisolierte Messwandler NEU.pptx Streland erstellt 2017-05-09 / Seite 15 / 12.06.2017
Insolation systems
Oil Paper Insulation
PRINZIPLE: Barrier
- The oil paper insulation is a layer
insulation, produced in "manual
work".
- Self-supporting.
- Active part is a complete self
contained system.
- Drying and impregnation
processes must be carefully
executed.
Gas Insolation
PRINZIPLE: „Pacmen“
- The inner surfaces of the housing,
the core shields of voltage
transformers, the core housing
and the primary conductor are
electrode surfaces. These have
to be accordingly smooth and
need sufficient radii.
- Not self-supporting Support
insulators required.
- Internal winding solutions are NOT
possible.
- Pressure relief works reliably
( gas is compressible ).
- Temperature-dependent
( liquefaction at low temperature ).
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THE TRANSFORMER: GIS ( MAINLY INDOOR )
GIS = Gas Insulated Switchgear
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[email protected] / Seite 19 / 12.06.2017
The GIS-market ist increasing
- Land is becoming increasingly expensive, so it´s a big advantage to
put the whole switchgear in a relatively small house.
- A whole bay can be delivered completely assembled in a container.
- The staff has access to the switchgear under power.
- The cores of the current transformer are located on the „low voltage
side“. Some GIS manufacturer put the cores outside the
encapsulation.
Voltage Transformer Three Phase Unit
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Voltage Transformer
For GIS voltage transformers a special
testing equipment is required
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Gas Insulation advantages
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- No hand crafting of the insulation, easy construction, high reproducibility.
- Explosion proof due to the pressure relief.
- Combined units für voltage ratios > 300 kV are easily possible
- Advantage GIS: Extremly space saving.
- No ageing of the insulation.
Just connect the filling device to the transformer
and open the valve Gas insolation = Insolation from the bottle
The labor costs for manufacturing a gas insulation are extremly low …
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Gas Insulation disadvantages
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- Particle sensitive. This is the biggest disadvantage for the
manufacturer.
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Gas Insulation disadvantages
- No ageing of the insulation. SF6 has an extreme chemical stability.
This leads to a GWP ( Global Warming Potential ) of 20 000. This
means, that 1 kg SF6 has an aequivalent of 20 tons of CO2.
- This may be relativated in the future by using one of the new
„replacement“ gases for SF6. But these are not really prooven and it
is actually not clear, witch of these gases will be used as „standard“.
- Gas insulated transformers are pressure vessels. Routine testing
required, lots of certificates have to be collected and stored.
- Density monitor required.
- Internal primary windings, as used in oil insulated transformers, are not
possible, so max. number of primary windings is 4.
Partikeles =
Public Enemy
No. 1
- Accumulate at areas of high field strength.
- Particles lead to failures in the final test.
- Flashover will happen WITHOUT any
warning ( e.g. warning by PD )
- Can also accrue after the test ( e.g. due to
transport vibration )
- Can cause operating failures
- Also insulating parts can be covered by
particles
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[email protected] / Seite 27 / 12.06.2017
PLEASE NOTE:
Often people speak about „consumption“ of SF6 gas
in regards of insulating switchgear.
This is not true = FAKE NEWS
The SF6 gas is not burned or consumed in the
transformer.
It is „stored“ while doing it´s job.
After the livetime of the transformer it can be win
back to start a new live in a new transformer.