1. © Siemens Industry, Inc. 2016. Answers for infrastructure and cities.
Medium-Voltage, Gas-Insulated,
Arc-Resistant Switchgear,
Types 8DA10 & 8DB10
www.usa.siemens.com/mvswitchgear

2. 2014
© Siemens Industry, Inc. 2016.
Page 2 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Siemens medium-voltage gas-insulated arc-resistant switchgear is:
Increased safety1
Easy to use5
Improved reliability2
Increased flexibility3
Innovative features4
Cost effective6 Type 8DA10 gas-insulated arc-resistant switchgear
Siemens Power Distribution
Medium-Voltage Gas-Insulated Switchgear
SF6 circuit breaker.mpg
GMSGAR_DuctVenting1.AVI

3. 2014
© Siemens Industry, Inc. 2016.
Page 3 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Non toxic
• No hazardous substance 1)
• Colorless, odorless and chemical neutral (inert)
• Heavier then air
1) acc. regulation on chemicals.
Labeling of hazardous substances acc. regulation (EG) Nr. 1272/2008 (CLP-regulation) : GHS04 (class: gases under pressure, compressed, liquefied, deep-frozen liquefied, dissolved gases)
• ... with compact design
• ... with high personnel safety
• ... with minimized fire load
• ... with high operational availability & reliability
Until today no climate-neutral gas is known with comparable characteristics
Core Technology: Insulating Medium SF6
SF6 technology enables electrical
equipment ...
stern2_1140_1400.mpg

4. 2014
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Page 4 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Vacuum interrupter technology
• Ratings:
• Maximum voltage: 4.76 kV, 15 kV, 27 kV or 38 kV
• Continuous section current: up to 2,500 A
(or 4,000 A using parallel circuit breakers)
• Short-circuit current: up to 40 kA
• Lightning-impulse withstand (BIL): up to 200 kV
• Tested to ANSI/IEEE C37.20.7-2007/
IEC 62271-200 arc-resistant internal arc
classification type 2B (front, side, rear with low-
voltage compartment door open)
• Low-pressure SF6 gas used as an insulating
medium for all primary components
• Primary components virtually maintenance-free
due to controlled gas environment
Medium-Voltage Gas-Insulated Switchgear
Features & Benefits

5. 2014
© Siemens Industry, Inc. 2016.
Page 5 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Circuit breaker endurance:
• Mechanical endurance: 10,000 times
• Mechanical endurance (optional): 30,000 times
• Electrical endurance : 10,000 times
• Full-fault switching capability: 50 times
• Compact footprint per section:
• 24” W x 64” D (8DA10 single bus)
• 24” W x 105” D (8DB10 double bus)
• Integral isolation by use of a three-position
selector switch (CONNECTED, DISCONNECT &
GROUND positions)
• Fixed-mounted circuit breakers (no special tools
for racking or lift truck for handling)
• Over 94,000 sections installed worldwide with
more than 4,500 installed in the U.S
Medium-Voltage Gas-Insulated Switchgear
Features & Benefits

6. 2014
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Page 6 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Medium-Voltage Gas-Insulated Switchgear
8DA10 Single Busbar Lineup Up To 42 kV
Front
view
Available at Koontz Wagner,
6510- Bourgeois Houston, TX 77066

7. 2014
© Siemens Industry, Inc. 2016.
Page 7 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
8DA10 single bus bar 8DB10 double bus bar
Medium-Voltage Gas-Insulated Switchgear
Types 8DA10 & 8DB10
Isolated-phase design eliminates possibility of phase-to-phase faults inside the switchgear

8. 2014
© Siemens Industry, Inc. 2014.
Page 8 IC1000-F320-A121-X-4A00 LMV MS U.S.
Medium-Voltage Gas-Insulated Switchgear
Compartmentalization
Single-busbar switchgear
Arrangement of gas-filled compartments
1 2 3 Item Description
1, 2, 3
Gas zone, one each for
main bus phase 1, phase
2 & phase 3
4
Gas zone, common for
circuit breaker phase 1, 2
& 3 associated feeder
connections
5
Gas zone, common for
bus sectionalizer bus for
phases 1, 2 & 3
1 2 3
5
4
1 2 3

9. 2014
© Siemens Industry, Inc. 2016.
Page 9 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Technical Data
Item Unit
Single-busbar (8DA10)
& double-busbar
(8DB10) switchgear
Single- pole
(8DA11) & double-
pole (8DA12)
traction power
supply switchgear*
Rated maximum design voltage kV 15 27 38** 17.5 27.5
Rated frequency Hz 50/60 50/60 50/60 16.7 50/60
Rated short-duration power-frequency
withstand voltage
kV 36 50 80 50 95
Rated lightning-impulse withstand voltage kV 95 125 200 125 200
Rated peak-withstand current kA 104 104 104 82 104
Rated short-circuit making current (peak) kA 104 104 104 82 104
Rated short-circuit withstand current 3 s kA 40 40 40 31.5 40
Rated short-circuit breaker current kA 40 40 40 31.5 40
Rated normal current of busbar, maximum A 5,000 5,000 5,000 2,500 3,150
Rated normal current of feeders, maximum A 2,500 2,500 2,500 2,000 2,500
Medium-Voltage Gas-Insulated Switchgear
Technical Data
* Consult Siemens Smart Grid division, Rail Electrification business, for information on traction power supply switchgear.
http://w3.usa.siemens.com/smartgrid/us/en/rail-electrification/Pages/Rail-Electrification.aspx
** Consult Siemens for rated maximum design voltage up to 42 kV.

10. 2014
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Page 10 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Footprint comparison (MV AIS & MV GIS - only equipment size considered)
38 kV
15 kV
MV
AIS
MV
GIS
MV
GIS
MV
AIS
Space saving
~75% ~55%
Medium-Voltage Gas-Insulated Switchgear
MV GIS Smaller Than MV AIS – Compact Footprint
Single bus
comparison

11. 2014
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Page 11 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Tested to ANSI/IEEE C37.20.7-2007/IEC 62271-200 for
internal arcing faults
• Arc-resistant internal arc classification type 2B
(front, side, rear with low-voltage compartment
door open)
• Reduced level of PPE permitted by NFPA 70E
for arc-resistant switchgear
Medium-Voltage Gas-Insulated Switchgear
MV GIS Is Tested For Arc Resistance

12. 2014
© Siemens Industry, Inc. 2016.
Page 12 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Comparison of PPE3 level required for operations
Activity MV air-insulated switchgear (AIS)1 MV GIS
Open/close
circuit breaker
HRC 2 (door closed)2
HRC 4 (door open)
HRC 04
Isolate circuit
HRC 4 (racking, door open or closed)
(Note: isolation in metal-clad requires
racking to test or disconnect position)
HRC 0 (operation of
three-position switch to
open position)
Application of
safety grounds
HRC 4 HRC 04
1 Non-arc-resistant.
2 HRC = hazard risk category HRC 0 = lowest level HRC 2 = 8 cal/cm2 PPE HRC 4 = 40 cal/cm2 PPE.
3 Derived from tables 130.7 (c) (15) (a) in NFPA 70E-2012. Refer to NEC 70E for detailed requirements.
4 HRC 0: non-melting or untreated natural fiber-protective clothing, long-sleeved shirt, long pants, safety glasses or goggles,
hearing protection.
For Major Operational Activities
Reduced Level Of PPE Can Be Used For MV GIS

13. 2014
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Page 13 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
UL/cUL Listed* as
arc resistant to
ANSI/IEEE C37.20.7-2007
* Ratings dependent
Medium-Voltage Gas-Insulated Switchgear
UL Listed*

14. 2014
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Page 14 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Low-voltage
compartment
Busbar
Drive mechanism/
three-position switch
Drive mechanism/
circuit breaker
Circuit breaker
pole housing
Current transformer
Cable connection
from the bottom
Medium-Voltage Gas-Insulated Switchgear
Circuit Breaker Section (8DA10 Single Bus Shown)
Gas monitoring

15. 2014
© Siemens Industry, Inc. 2016.
Page 15 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Busbar housing
Three-position
switch (shown OPEN)
Pole housing
Medium-Voltage Gas-Insulated Switchgear
Busbar Design Up To 5000 A
Busbar 5000 A
Busbar up to 4000 A
Busbar
Busbar
Twin busbar housing
Busbar

16. 2014
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Page 16 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Three-Position Selector Switch
Medium-Voltage Gas-Insulated Switchgear
Three-Position Selector Switch
OPEN
READY-TO-
GROUND
CLOSED

17. 2014
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Page 17 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Compact – same footprint from
2.4 kV to 42 kV
• Gas insulation eliminates derating
due to altitude
• Video camera system to view three-
position switch status – complies
with NEC visible disconnect
requirement (NEC 225.51 &
230.204)
• Capacitive voltage indicators –
avoids need for hot-stick for
checking energization of primary
• Integral grounding switch –
grounding cables are unnecessary
Overview of innovative features
Medium-Voltage Gas-Insulated Switchgear
Innovative Features

18. 2014
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Page 18 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
8DA/B ANSI
Camera housing and mounting

19. 2014
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Page 19 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
8DA/B ANSI
Hardware
ƒ RJ45 (ethernet) and USB
connector on laptop necessary
ƒ USB-A 2.0 or 3.0
ƒ Ethernet
Ethernet connection
USB interface
Screw caps for protection
1
3
2

20. 2014
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Page 20 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
8DA/B ANSI
Software
ƒ No special software tool and
software expertise required
ƒ Only web browser is needed
ƒ Mozilla Firefox
ƒ Microsoft Internet Explorer
ƒ Google Chrome
ƒ Safari
ƒ Other browsers might work,
but are not covered with
development tests
Ethernet connection
USB interface
Screw caps for protection
12
3

21. 2014
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Page 21 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
8DA/B ANSI
Operation
ƒ Open screw caps (at switchgear front or
rear wherever it is applicable)
ƒ Connect USB and RJ45 plugs (between
switchgear interface and laptop, cables
are supplied)
ƒ Start web browser and type in any
address
ƒ Three reference pictures on top view
(CLOSED, OPEN, GROUNDED)
ƒ Camera live-view below
ƒ Three software buttons available to
switch view from phase L1, L2 and L3
Ethernet connection
USB interface
Screw caps for protection
1
3
2

22. 2014
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Page 22 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Medium-Voltage Gas-Insulated Switchgear
View Port Via Video Camera
Use of PC to
view position of
selector switch

23. 2014
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Page 23 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Capacitively Coupled Voltage Indication System
C2
C1
Potential
indicator
or
indicator
Medium-Voltage Gas-Insulated Switchgear
Capacitively Coupled Voltage Indication System
• Coupling electrode built into pole-support
plate of the circuit breaker
• For checking the energization state of each
pole
• No hot stick required to check voltage
presence
Plug-in LRM voltage indicator

24. 2014
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Page 24 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Circuit
OFF &
ISOLATED
Ready To
Ground
Circuit
GROUNDED
Circuit
CLOSED
Medium-Voltage Gas-Insulated Switchgear
Three-Position Selector Switch

25. 2014
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Medium-Voltage Gas-Insulated Switchgear
Lockout/Tagout

26. 2014
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Page 26 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Sealed pressure system protects
against environmental influences
(IP65)
• Single-pole enclosure eliminates
possibility of phase-to-phase faults
inside switchgear
• Division of gas compartments
enables rapid problem isolation
• Mean time between major failure:
• MV GIS — 5,300 years
(based on last 10 years data)
• MV AIS — 856 years (estimate)
Overview of reliability features
Sources: IEEE 493 Gold Book (for MV AIS), Siemens internal data (for MV GIS)
Medium-Voltage Gas-Insulated Switchgear
High-Operational Reliability

27. 2014
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Page 27 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
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%
Share
Not applicable
to MV GIS





Estimated
50% of
failure
causes
not
applicable
with
MV GIS
OverviewoffailurecausesforMVAIS
Medium-Voltage Gas-Insulated Switchgear
Reduces Or Eliminates Causes Of
50% Of Failures In MV AIS
MV AIS
failure cause

28. 2014
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Page 28 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Vacuum interrupter mounted in
circuit breaker pole housing
• Non-sliding current transfer from
vacuum interrupter moving contact
to three-position switch
Medium-Voltage Gas-Insulated Switchgear
Vacuum Interrupter

29. 2014
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Page 29 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Ring-core current
transformers:
• Current transformers
located outside gas
zone
• Secondary part
accessible outside
the enclosure (& gas
zone) without
exposure to primary
voltage
• Free of dielectrically-
stressed cast-resin
parts
A
C
B
A
Medium-Voltage Gas-Insulated Switchgear
Current Measurement
Current transformer
installation
(basic scheme)
Item Description
A
Feeder current
transformer on the
cable housing
B
Feeder current
transformer on the
cable
C
Busbar current
transformer

30. 2014
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Page 30 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Mounted separately & connected via a
plug-in cable
• Grounded metal-enclosed
• Connected line-ground
• VT solid insulated with grounded metal-enclosure
• Outside main circuit
• Fused
• No gas work required to remove or install
Voltage transformer
with primary fuse
Medium-Voltage Gas-Insulated Switchgear
Line-Side (Cable-Side) Voltage Transformer
Item Description
1 Bus connected VT
2 Cable connected VT
1
2

31. 2014
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Page 31 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Internal cone type plug-in connections
per EN-50181/DIN 47637
• Sizes available up to 1,250 A per
conductor (cable) and up to
2,500 A for cast-epoxy insulated bus
• Size 2, up to 40 mm (1.57”) O.D.,
up to 800 A
• Size 3, up to 46 mm (1.81”) O.D.,
up to 1,250 A
• Size 3.5, up to 50 mm (1.97”) O.D.,
up to 1,250 A
• Diameter is over insulation, without
voltage detection tap
Medium-Voltage Gas-Insulated Switchgear
Plug-In Cable Termination System

32. 2014
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Page 32 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Medium-Voltage Gas-Insulated Switchgear
Low Maintenance Over Life Cycle
Types 8DA10/8DB10
Visual inspection Every 5 years
Condition
inspection
Every 10 years
Maintenance
After 1,000 operating cycles of the disconnectors &
grounding switches or after 10,000 operating cycles of the
circuit breaker.
These intervals are guidelines which have to be adjusted to the different operating conditions
(i.e., dusty environment, frequent condensation, etc.) which can affect operating mechanism

33. 2014
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Page 33 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Medium-Voltage Gas-Insulated Switchgear
Maintenance Checks
Visual
inspection
Condition
inspection
Maintenance Description
X X X Check & document SF6 gas pressure
X X
Check & document dew-point (humidity
content) (≤15 ˚C)
X X
Check & document gas quality
(air content) (SF6 share ≥ 95%)
X
Check operating mechanism & interlocking
of disconnector & grounding switch. If
required, grease linkage & bearings.
X
Vacuum circuit breaker operating
mechanism

34. 2014
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Page 34 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Dielectric withstand
in relation to gas
pressure/leakage
(example: 38 kV)
Gas pressure (abs.)
0/100 50/50 100/0 1.0 1.3 1.5 1.7 bar
200
150
100
80
50
SF6 / air mixture (%)
SF6 at gauge
pressure
0
ANSI rated 60 Hz withstand
ANSI rated impulse (BIL)
30
Switching under
normal conditions still
possible
Medium-Voltage Gas-Insulated Switchgear
Dielectric Withstand
Normal atmospheric pressure

35. Page 35
Consider not just the one-time purchase cost,
but also the total life-cycle cost
ReliabilityFootprint
Maintenance
MV AIS
MV GIS
Safety
Medium-Voltage Gas-Insulated Switchgear
Consider These Investment Decision Advantages
Spare Parts

36. 2014
© Siemens Industry, Inc. 2016.
Page 36 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Questions Answers
Can the circuit breaker interrupt if
there is a leak and no SF6 gas is
available?
Yes, the vacuum interrupters are
independent of the SF6 gas and all the
interruption occurs inside the vacuum
interrupters. SF6 gas is only used for
insulation.
What is the SF6 leakage rate in
Siemens MV GIS 8DA/B?
The low leakage rate is possible as
the normal pressure is 1.5 bar (22
psig) or less, and the SF6 gas is used
only for insulation, not for interruption.
Leakage is below 0.1% per year.
Go-To-Market
FAQs

37. 2014
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Page 37 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Questions Answers
Is SF6 a greenhouse gas “GHG”? Yes, SF6 is a GHG with atmospheric
lifetime of 3,200 years.
Are there any taxes applicable on use
of SF6 gas in MV switchgear or any
regulatory requirements?
No, users are required to report
annually SF6 volume if their inventory
exceeds 17,800 lbs at any time.
How do I quantify 17,800 lbs of SF6
gas in terms of number of sections?
8DA10 ~ 2,700 sections
8DB10 ~ 1,400 sections
What is the percentage of emissions
of SF6 gas from T&D equipments
compare to the total emissions of all
the gases in the U.S.?
In 2013, total emissions of all GHG
reported was 5,791.2 MMT CO2
equivalent. Emissions from T&D
equipments were 5.1 MMT CO2
equivalent. Net emission from T&D
equipment was < 0.1% (5.1/5,791.2)
Go-To-Market
FAQs

38. 2014
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Page 38 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Reference project in Utility/IOU
Customer information
ƒ Customer: Georgia Power
(Demo Unit)
ƒ Location: Georgia
Project information
ƒ Equipment type: 8DB
ƒ Number of sections: 4
ƒ Voltage: 25 kV
ƒ Short-circuit current: 40 kA
ƒ Year of installation: 2009

39. 2014
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Page 39 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Reference project in Pharmaceutical
Customer information
ƒ Customer: Amgen, Inc.
ƒ Location: Washington
Project information
ƒ Equipment type: 8DA
ƒ Number of sections: 50
ƒ Voltage: 4.16 kV and
26.4 kV
ƒ Short-circuit current: 40 kA
ƒ Year of installation: 2001

40. 2014
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Page 40 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Reference project in Heavy Industry/Manufacturing
Customer information
ƒ Customer: Caterpillar, Inc.
ƒ Location: Illinois
Project information
ƒ Equipment type: 8DA
ƒ Number of sections: 40
ƒ Voltage: 13.8 kV
ƒ Short-circuit current: 40 kA
ƒ Year of installation: 2008
(shown during installation)

41. 2014
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Page 41 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Reference project in Oil and Gas/Refinery
Customer information
ƒ Customer: ConocoPhillips
ƒ Location: Wood River,
Illinois
Project information
ƒ Equipment type: 8DA
ƒ Number of sections: 54
ƒ Voltage: 38 kV
ƒ Short-circuit current: 40 kA
ƒ Year of installation: 2009

42. 2014
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Reference project in Oil and Gas/Refinery
Customer information
ƒ Customer: Hovensa
Refinery
ƒ Location: St. Croix, U.S.
Virgin Islands
Project information
ƒ Equipment type: 8DA
ƒ Number of sections: 54
ƒ Voltage: 38 kV
ƒ Short-circuit current: 40 kA
ƒ Year of installation: 2005

43. 2014
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Reference project in Oil and Gas/Extraction
Customer information
ƒ Customer: Canadian
Natural Resources Ltd. -
Horizon Oil Sands
ƒ Location: Alberta, Canada
Project information
ƒ Equipment type: 8DA
ƒ Number of sections: 265
ƒ Voltage: 5 kV, 15 kV and
38 kV
ƒ Short-circuit current: 40 kA
ƒ Year of installation: 2005

44. 2014
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Page 44 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Reference project in Higher Education
Customer information
ƒ Customer: NOVA
Southeastern University
Location: Florida
Project information
ƒ Equipment type: 8DA
ƒ Number of sections: 265
ƒ Voltage: 4.16 kV and 13.8 kV
ƒ Short-circuit current: 40 kA
ƒ Year of installation: 2009

45. 2014
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Page 45 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Manufacturing Location
Siemens MV GIS Manufacturing in Frankfurt (SWF): The Home of GIS!

46. 2014
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Page 46 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Medium-Voltage Gas-Insulated Switchgear
GIS
compared to
AIS

47. Unrestricted © Siemens Industry, Inc. 2016 Usa.siemens.com/mediumvoltage
Fixed-type, gas-insulated
medium-voltage switchgear
compared to air-insulated switchgear
Technology comparison
2016

48. May-2016
Unrestricted © Siemens Industry, Inc. 2016
Page 48 EMMS-T40042-00-4AUS / EM MS U.S.
MV AIS
• Drawout type construction, where
circuit isolation is achieved by
opening the circuit breaker and
then racking it to the test or
disconnect position.
• No built-in circuit grounding
capability. Grounding of load
circuit requires drawout ground
and test device.
MV GIS
• Fixed-mounted circuit breakers
with interlocked isolation switch
and grounding switch. Isolation
meets NEC visible disconnect
requirement.
• Grounding accomplished with
grounding switch and circuit
breaker with fault-making
capability. Sequential
interlocking prohibits
mis-operation.
MV GIS Comparison To MV AIS

49. May-2016
Unrestricted © Siemens Industry, Inc. 2016
Page 49 EMMS-T40042-00-4AUS / EM MS U.S.
MV AIS
• Drawout type construction,
requiring physical movement of
circuit breaker from connected to
test or disconnect position.
• Historic experience suggests
higher potential for failures
associated during racking.
MV GIS
• GIS achieves isolation without the
movement of the circuit breaker,
eliminating the potential for
misalignment.
MV GIS Comparison To MV AIS

50. May-2016
Unrestricted © Siemens Industry, Inc. 2016
Page 50 EMMS-T40042-00-4AUS / EM MS U.S.
MV GIS Comparison To MV AIS
MV AIS
• Conventional-type cable
termination (cable lugs and stress
cones), exposed to contaminants
MV GIS
• Plug-in type cable termination,
which provides IP65 protection
and easy installation at site

51. May-2016
Unrestricted © Siemens Industry, Inc. 2016
Page 51 EMMS-T40042-00-4AUS / EM MS U.S.
Siemens MV GIS Advantages
MV GIS
offers the
advantages
of a
switching
device -
a minimum
number of
parts
resulting in
a high
MTBF
1. No regular maintenance
1. Visual inspection: 5 years
2. Status inspection: 10 years
3. Maintenance after 10,000
operations
2. No impact from environmental
conditions (except for flooding)
3. Highest IP protection by having
IP65 for high-voltage parts.
4. Highest personal safety.
5. Operational safety
6. Compact design
7. No extra-storage space required
1. Saves costs - no shutdowns needed.
2. Saves insulators from dust;
provides constant insulation quality.
3. No penetration of foreign bodies like dust,
small animals and moisture.
4. High-voltage part installed in gas-insulated,
sealed housing so no access to high-voltage
parts. Fool-proof interlocks.
5. Low-maintenance switching device.
Cable grounding via the circuit breaker.
Risk of internal arcs minimized.
6. Up to ~75% space saving vs AIS.
7. Only a few small secondary spare parts
recommended.

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Footprint comparison (MV AIS & MV GIS - only equipment size considered)
38 kV
15 kV
MV
AIS
MV
GIS
MV
GIS
MV
AIS
Space saving
~75% ~55%
MV GIS Smaller Than MV AIS – Compact Footprint
Single bus
comparison

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MV GIS Advantages - Maintenance
MV AIS
Required latest after 5 years of service:
• Switch off of lines, feeders and busbars
• Grounding
• All circuit breakers in test position
• Test function of circuit breakers and and all other
switching devices
• Remove the drawout circuit breaker and remove
covers partly to access to busbars and cable
sections
• Clean the sections and all insulation, and check all
bolted connections
• Lubricate all bearings and surfaces; check panel
function and put switchgear back into service
Example:
Estimated time per section: 4 hours
For a 20-section lineup 80 working hours,
respective to 8 working days for maintenance
Average $180 per person per hour, i.e., $14,400
for a 20-section lineup
MV GIS
• Requires minimal maintenance
• Visual inspection: 5 years
• Check gas-pressure gauges
• General visual survey.
Example:
For the 20-section lineup, potential savings $14,400.
After 30 years, total savings $86,400

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MV GIS Advantages - Availability
MV AIS
• During maintenance, switchgear is out of
service.
• Provisions for alternative supply circuits
must exist.
• Switching procedures must be followed.
• After maintenance, original conditions need
to be re-established.
Risks:
• Switching failures.
• Network disturbances may occur.
• Human errors, tools left in equipment, loose
connections, loose bolts, missing covers,
etc.
Therefore, the risk of failures inside the
switchgear (including potential for arc
fault) may be higher.
MV GIS
• Almost maintenance free.
• No human errors can occur due to
hermetically- sealed isolation.
• Insulation cannot be contaminated.
Peace of mind

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MV GIS Advantages – Environmental Aspects
MV AIS
• Influence of dust, humidity and vermin to active
parts as busbars, breakers, cable connections:
• Need of maintenance, cleaning of insulation
• Condensation – potential for partial
discharges and damage to insulation.
• Need to eliminate potential for vermin in
switchgear
• Reduction in dielectric withstand (hipot and
impulse) for high altitudes
Example: 27 kV AIS at altitude of 6,562 ft (2,000 m)
needs rated insulation level of 138 kV BIL to provide
125 kV BIL at 6,562 ft (2,000 m). Since this cannot be
reached with 27 kV AIS, 38 kV AIS is required, which
means higher costs.
Additional costs and control are necessary.
MV GIS
• No environmental influences (flooding exception)
due to maintenance-free, hermetically sealed (HV)
switchgear.
• No influence of insulation level due to altitude.
Example:
Peace of mind and cost savings.

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MV GIS Advantages - Dimensions
MV AIS
For 27 kV, 2,000 A, 25 kA, AIS dimensions:
• Width: 3.0 ft (.91 m)
• Depth: 8.0 ft (2.4 m)
Floor space per section is equal to 24.0 ft²
(2.2 m2)
Example:
20-section lineup, area required:
• 480.0 ft² without required rear aisle
• 840.0 ft² with NEC clear working space in
rear.
MV GIS
For 27 kV, 2,000 A, 25 kA GIS dimensions:
• Width: 1.97 ft (.6 m)
• Depth: 5.3 ft (1.62 m)
Floor space per section is equal to 10.4 ft²
(1.0 m2) and no working space required at
rear
Example:
20-section lineup, area required:
• 209.0 ft² and no rear aisle required.
Source for $ per ft² : http://www.businessinsider.com/us-city-
real-estate-price-chart-2014-3
Savings Value
271 ft2 without rear aisle $13.6 k to $180.3 k
631 ft2 with rear aisle $31.6 k to $419.8 k

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Aisle space
“I have to double the substation MVA,
but don’t have the space?”
38 kV switchgear
space requirements
single bus comparison
Air-insulated switchgear
99.3 ft2 = 9.2 m2
Gas-insulated switchgear
22.7 ft2 = 2.1 m2
Space Problems?
48” (1,219)
24”
130” (3,302 mm)
72” (1,827 mm)
aisle space (NEC)
64” (1,626 mm)
24” (610 mm)
72” (1,827 mm)
minimum rear access (NEC)
96” (2,438 mm)
drawout space
Space Problems? MV GIS Advantages
*
* No rear access required,
eliminating need for rear aisle

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MV GIS Advantages - Reliability
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%
Share
Not applicable
to MV GIS





Estimated
50% of
failure
causes not
applicable
with
MV GIS
MV AIS
failure cause
OverviewoffailurecausesforMVAIS

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MV GIS Advantages – 150 kV BIL
MV AIS
Due to the requirement of 150 kV BIL at
27 kV, the switchgear selection should be
upgraded to the next voltage level.
This BIL value cannot be reached with
typical 27 kV switchgear.
Therefore, 38kV switchgear is required,
which means higher costs for the
customer:
• Higher equipment costs
• Much higher costs for real estate.
MV GIS
• Same design & footprint for voltages up to
40.5 kV
• No environmental influences due to
maintenance -free, hermetically-sealed
(HV portion) switchgear.
Cost savings.

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MV GIS Advantages – Spare Parts
MV AIS
For an estimated lifetime of 30 years, spares
needed.
•Lubricants
•Screws
•Bolts
•Nuts
•Contact fingers for draw out unit
•Isolators
•Bushings
Therefore additional cost for spares,
storage , handling, installation of parts,
staff for exchange the parts incurred.
MV GIS
Few small secondary parts recommended.
Cost savings due to minimal cost of
spares, no additional storage room,
handling cost and cost of staff.

61. 2014
© Siemens Industry, Inc. 2016.
Page 61 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Thank You
Murtaza Hussain Khan
Hussain.murtaza@siemens.com
+1 346 206 9980