CELDAS DE MEDIA TENSIÓN GIS Y AIS SIEMENS

CELDAS MT

1. Medium-voltage, gas-insulated,
arc-resistant switchgear
Types 8DA10 and 8DB10
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2. Siemens medium-voltage gas-insulated switchgear
Key advantages
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Safety
Footprint
Reliability
Maintenance
Total cost of
ownership
MV AISMV GIS
Not always
arc-resistant
Inherently
arc-resistant
Much largerdue to
air-insulation and
need for rear aisle
Smaller footprint
due to SF
6insulation
and integral disconnect/
grounding functions
Lower reliability
due to environmental
influences and
possibility of
phase-to-phase faults
Higher reliability
due to hermetically
enclosed system and
single-phase
encapsulation
Higher costsdue to
regular bus bar and
circuit breaker
maintenance
Lower costs
due to hermetically
enclosed system and
enclosed cable plugs
Higher TCOin 38 kV
and 27 kV applications
Lower TCOin 38 kV
and 27 kV applications

3. Summary of key MV GIS advantages over MV AIS
Unrestricted | © Siemens Industry, Inc. 2022 | US SI EA | 2022-05-04
Features
Safety
Arc-resistant. Tested to C37.20.7, Type
2B
Mainte-
nance
Lower maintenance costs due to
hermetically enclosed system and
enclosed cable plugs
Footprint
Smaller footprint due to SF
6insulation and
integral disconnect/grounding functions
Reliability
High reliability due to hermetically enclosed
system and single-phase encapsulation
Total cost
of ownership
Lower Total Cost of Ownership (TCO)
especially in 27 kV & 38 kV applications
MV GIS characteristic Comparison to MV AIS
Not always arc-resistant
Higher maintenance cost due to regular
bus bar and circuit breaker maintenance
Much larger size required due to air insulation
and need for rear aisle
Lower reliability due to environmental influence
and possibility of phase-to-phase faults
Higher TCO especially in
27 kV & 38 kV applications
GIS
All ratings
All ratings
38kV
All ratings
38kV

4. Medium-voltage, gas-insulated switchgear
Environmental problems?
* IP65 – protected against access to live parts using a
wire, dust-tight, and protected against water jets
(no equivalent NEMA 250 designation)
Primary circuit is IP65*
Environmental problems:
Dust?
Salt?
Moisture?
Corrosive gases?
Mice?
Rats?
Cats?
Squirrels?
Snakes?
Altitude?
Unrestricted | © Siemens Industry, Inc. 2022 | US SI EA | 2022-05-04

5. Medium-voltage, gas-insulated switchgear
Reduces or eliminates causes of 50% of failures in MV AIS
Unrestricted | © Siemens Industry, Inc. 2022 | US SI EA | 2022-05-04
Source: IEEE 493 Gold Book, Annex E, table XVIII, page 479
Thermocycling
Mechanical structure failure
Mechanical damage from foreign source
Shorting by snakes, birds, rodents, etc.
Malfunction of protective device
Above normal ambient
Exposure to chemicals or solvents
Exposure to moisture
Exposure to dust or other contaminants
Exposure to non-electrical fire
Normal deterioration from age
Severe weather condition
Others
7%
3%
7%
3%
10%
3%
3%
30%
10%
7%
10%
3%
4%
Estimated 50% of
failure causes not
applicable with
MV GIS
MV AIS sample of failure causes Applicable to MV GIS?Share
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6. Siemens MV GIS advantages
SF
6manometer
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1.Signaling contact:
Pressure lower than minimum functional level
2.Signaling contact:
Minimum functional level
3.Gas-pressure indicator:
Rated functional level
4.Signaling contact:
Maximum functional level
The manometer is installed
on the switchgear in the front.
Instead of gas density meter, which required auxiliary supply, Siemens uses positive pressure manometer.
No need ofauxiliary supplyto see the pressure
The number of signaling contacts can vary to meet the site-specific requirements.
Auxiliary contacts can be used for alarm or indication.No need to lock-out the breaker.

7. 38 kV
15 kV
MV
AIS
MV
GIS
MV
GIS
MV
AIS
space saving~75% ~55%
Single bus comparison
Medium-voltage, gas-insulated switchgear
MV GIS (8DA10) smaller than MV AIS – compact footprint
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8. Medium-voltage, gas-insulated switchgear
Low maintenance over life cycle
8DA10/8DB10Types
Every 5 yearsVisual inspection
Every 10 yearsCondition inspection
After 1,000 operating cycles of the disconnectors
and grounding switches or after 10,000 operating
cycles of the circuit breaker.
Maintenance
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These intervals are guidelines, which
have to be adjusted to the different
operating conditions
(i.e., dusty environment, frequent
condensation, etc.) and can affect
operating mechanism.

9. Medium-voltage, gas-insulated switchgear
Maintenance checks
DescriptionMaintenance
Condition
inspection
Visual
inspection
Check and document SF
6gas pressure
Check and document dew point (humidity content) (≤15 ˚C)
Check and document gas quality (air content) (SF
6share ≥ 95%)
Check operating mechanism and interlocking of disconnector and
grounding switch. If required, grease linkage and bearings.
Vacuum circuit breaker operating mechanism
Unrestricted | © Siemens Industry, Inc. 2022 | US SI EA | 2022-05-04
These intervals are guidelines, which
have to be adjusted to the different
operating conditions
(i.e., dusty environment, frequent
condensation, etc.) and can affect
operating mechanism.

10. Unrestricted | © Siemens Industry, Inc. 2022 | US SI EA | 2022-05-04
Gas filling pressure 120 kPa
(17.4 psi)
Even at 70 kPa BIL is 200 kV
(0% air / 100% SF6)
At 0 kPa relative pressure BIL
is 140 kV (0% air / 100% SF6)
At 100% air / 0% SF6 BIL is
70 kV
120 kPa
No immediate shutdown
required at reduced gas
pressure!!
Medium-voltage gas-insulated switchgear
Basic Insulation Level

11. Medium-voltage gas-insulated switchgear
Power Frequency Withstand Voltage (PFWV)
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Pressure
Gas filling pressure 120 kPa
(17.4 psi)
Even at 70 kPa BIL is 200 kV
(0% air / 100% SF6)
At 0 kPa relative pressure BIL
is 140 kV (0% air / 100% SF6)
At 100% air / 0% SF6 BIL is
70 kV
No immediate shutdown
required at reduced gas
pressure!!
120 kPa

12. Unique Value Proposition
In Nutshell
1. Summary of key GIS advantages over AIS – ISO
phase design
2. With GIS technology, 50% of the AIS faults are
eliminated
3. Advance visible means of disconnect to comply
with NEC
4. Gas manometer doesn’t need auxiliary supply.
5. Low gas pressure doesn’t require breaker lock-out.
6. Arc-flash hazard – reduces incidental energy with
ISO phase design
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13. Medium-voltage, gas-insulated switchgear
Investment decision advantages
Unrestricted | © Siemens Industry, Inc. 2022 | US SI EA | 2022-05-04
Consider not just the one-time purchase cost but the total lifecycle cost
Maintenance
Safety
Footprint
MV AIS
MV GIS
Total
lifecycle
cost
Reliability

14. Medium-voltage, gas-insulated switchgear
Characteristics of SF
6
Non-
poisonous,
non-
flammable,
inert,
self-restoring
insulation
Dielectric
strength 2.5
times that of
air
Low current
arcs are self-
extinguishing
SF
6only
insulates –
not used for
interrupting;
no arcing by-
products
No oxidation
inside of
enclosure
Gas leakage
rate < 0.1%
annually
Unrestricted | © Siemens Industry, Inc. 2022 | US SI EA | 2022-05-04
Colorless,
odorless,
non-toxic,
Doesn’t
deplete
Ozone layer
Thermally
stable
(decompositi
on does not
occur below
500 °C)
SF
6only
insulates –
not used for
interrupting;
no arcing by-
products
Good heat
dissipation
characteristics
Low current
arcs are self-
extinguishing
Want to learn more – Please visithttps://new.siemens.com/us/en/products/energy/techtopics/techtopics-53.html

15. Contact
Published by Siemens 2022
Mohammad Hassan
Director Business Development
MV GIS and Overhead Switch Product Specialist
Siemens Industry, Inc.
7000 Siemens Road
Wendell, NC, 27591
Cell:[phone]
E-mail:[email protected]
usa.siemens.com/mvswitchgear
Unrestricted | © Siemens Industry, Inc. 2022 | US SI EA | 2022-05-04