Siemens MV GIS Switchgear
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Transcript of Siemens MV GIS Switchgear
© Siemens Industry, Inc. 2016. Answers for infrastructure and cities.
Medium-Voltage, Gas-Insulated,Arc-Resistant Switchgear,Types 8DA10 & 8DB10
www.usa.siemens.com/mvswitchgear
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 effective6Type 8DA10 gas-insulated arc-resistant switchgear
Siemens Power DistributionMedium-Voltage Gas-Insulated Switchgear
SF6 circuit breaker.mpgGMSGAR_DuctVenting1.AVI
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 electricalequipment ...
stern2_1140_1400.mpg
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© Siemens Industry, Inc. 2016.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 arcclassification type 2B (front, side, rear with low-voltage compartment door open)
• Low-pressure SF6 gas used as an insulatingmedium for all primary components
• Primary components virtually maintenance-freedue to controlled gas environment
Medium-Voltage Gas-Insulated SwitchgearFeatures & Benefits
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-positionselector switch (CONNECTED, DISCONNECT &GROUND positions)
• Fixed-mounted circuit breakers (no special toolsfor racking or lift truck for handling)
• Over 94,000 sections installed worldwide withmore than 4,500 installed in the U.S
Medium-Voltage Gas-Insulated SwitchgearFeatures & Benefits
2014
© Siemens Industry, Inc. 2016.Page 6 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Medium-Voltage Gas-Insulated Switchgear8DA10 Single Busbar Lineup Up To 42 kV
Frontview
Available at Koontz Wagner,6510- Bourgeois Houston, TX 77066
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 SwitchgearTypes 8DA10 & 8DB10
Isolated-phase design eliminates possibility of phase-to-phase faults inside the switchgear
2014
© Siemens Industry, Inc. 2014.Page 8 IC1000-F320-A121-X-4A00 LMV MS U.S.
Medium-Voltage Gas-Insulated SwitchgearCompartmentalization
Single-busbar switchgearArrangement of gas-filled compartments
1 2 3 Item Description
1, 2, 3Gas zone, one each for
main bus phase 1, phase2 & phase 3
4
Gas zone, common forcircuit breaker phase 1, 2
& 3 associated feederconnections
5Gas zone, common for
bus sectionalizer bus forphases 1, 2 & 3
1 2 3
5
4
1 2 3
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© Siemens Industry, Inc. 2016.Page 9 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Technical Data
Item UnitSingle-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 50/60Rated 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 3,150Rated normal current of feeders, maximum A 2,500 2,500 2,500 2,000 2,500
Medium-Voltage Gas-Insulated SwitchgearTechnical 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.
2014
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Footprint comparison (MV AIS & MV GIS - only equipment size considered)
38 kV
15 kV
MVAIS
MVGIS
MVGIS
MVAIS
Space saving~75% ~55%
Medium-Voltage Gas-Insulated SwitchgearMV GIS Smaller Than MV AIS – Compact Footprint
Single buscomparison
2014
© Siemens Industry, Inc. 2016.Page 11 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Tested to ANSI/IEEE C37.20.7-2007/IEC 62271-200 forinternal arcing faults
• Arc-resistant internal arc classification type 2B(front, side, rear with low-voltage compartmentdoor open)
• Reduced level of PPE permitted by NFPA 70Efor arc-resistant switchgear
Medium-Voltage Gas-Insulated SwitchgearMV GIS Is Tested For Arc Resistance
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/closecircuit breaker
HRC 2 (door closed)2
HRC 4 (door open) HRC 04
Isolate circuitHRC 4 (racking, door open or closed)(Note: isolation in metal-clad requiresracking to test or disconnect position)
HRC 0 (operation ofthree-position switch to
open position)
Application ofsafety 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 ActivitiesReduced Level Of PPE Can Be Used For MV GIS
2014
© Siemens Industry, Inc. 2016.Page 13 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
UL/cUL Listed* asarc resistant toANSI/IEEE C37.20.7-2007
* Ratings dependent
Medium-Voltage Gas-Insulated SwitchgearUL Listed*
2014
© Siemens Industry, Inc. 2016.Page 14 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Low-voltagecompartment
Busbar
Drive mechanism/three-position switch
Drive mechanism/circuit breaker
Circuit breakerpole housing
Current transformer
Cable connectionfrom the bottom
Medium-Voltage Gas-Insulated SwitchgearCircuit Breaker Section (8DA10 Single Bus Shown)
Gas monitoring
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Busbar housing
Three-positionswitch (shown OPEN)
Pole housing
Medium-Voltage Gas-Insulated SwitchgearBusbar Design Up To 5000 A
Busbar 5000 A
Busbar up to 4000 A
Busbar
Busbar
Twin busbar housing
Busbar
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Three-Position Selector SwitchMedium-Voltage Gas-Insulated SwitchgearThree-Position Selector Switch
OPEN
READY-TO-GROUND
CLOSED
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• Compact – same footprint from2.4 kV to 42 kV
• Gas insulation eliminates deratingdue to altitude
• Video camera system to view three-position switch status – complieswith NEC visible disconnectrequirement (NEC 225.51 &230.204)
• Capacitive voltage indicators –avoids need for hot-stick forchecking energization of primary
• Integral grounding switch –grounding cables are unnecessary
Overview of innovative features
Medium-Voltage Gas-Insulated SwitchgearInnovative Features
2014
© Siemens Industry, Inc. 2016.Page 18 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
8DA/B ANSICamera housing and mounting
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© Siemens Industry, Inc. 2016.Page 19 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
8DA/B ANSIHardware
ƒ RJ45 (ethernet) and USBconnector on laptop necessary
ƒ USB-A 2.0 or 3.0
ƒ Ethernet
Ethernet connection
USB interface
Screw caps for protection1
3
2
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© Siemens Industry, Inc. 2016.Page 20 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
8DA/B ANSISoftware
ƒ No special software tool andsoftware 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 withdevelopment tests
Ethernet connection
USB interface
Screw caps for protection12
3
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© Siemens Industry, Inc. 2016.Page 21 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
8DA/B ANSIOperation
ƒ Open screw caps (at switchgear front orrear wherever it is applicable)
ƒ Connect USB and RJ45 plugs (betweenswitchgear interface and laptop, cablesare supplied)
ƒ Start web browser and type in anyaddress
ƒ Three reference pictures on top view(CLOSED, OPEN, GROUNDED)
ƒ Camera live-view below
ƒ Three software buttons available toswitch view from phase L1, L2 and L3
Ethernet connection
USB interface
Screw caps for protection1
3
2
2014
© Siemens Industry, Inc. 2016.Page 22 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Medium-Voltage Gas-Insulated SwitchgearView Port Via Video Camera
Use of PC toview position ofselector switch
2014
© Siemens Industry, Inc. 2016.Page 23 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Capacitively Coupled Voltage Indication System
C2
C1
Potentialindicator
or
indicator
Medium-Voltage Gas-Insulated SwitchgearCapacitively Coupled Voltage Indication System
• Coupling electrode built into pole-supportplate of the circuit breaker
• For checking the energization state of eachpole
• No hot stick required to check voltagepresence
Plug-in LRM voltage indicator
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© Siemens Industry, Inc. 2016.Page 24 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
CircuitOFF &
ISOLATED
Ready ToGround
CircuitGROUNDED
CircuitCLOSED
Medium-Voltage Gas-Insulated SwitchgearThree-Position Selector Switch
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© Siemens Industry, Inc. 2016.Page 25 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Medium-Voltage Gas-Insulated SwitchgearLockout/Tagout
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• Sealed pressure system protectsagainst environmental influences(IP65)
• Single-pole enclosure eliminatespossibility of phase-to-phase faultsinside switchgear
• Division of gas compartmentsenables 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 SwitchgearHigh-Operational Reliability
2014
© Siemens Industry, Inc. 2016.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 applicableto MV GIS
Estimated50% offailurecausesnotapplicablewithMV GIS
Ove
rvie
wof
failu
reca
uses
forM
VA
IS
Medium-Voltage Gas-Insulated SwitchgearReduces Or Eliminates Causes Of50% Of Failures In MV AIS
MV AISfailure cause
2014
© Siemens Industry, Inc. 2016.Page 28 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Vacuum interrupter mounted incircuit breaker pole housing
• Non-sliding current transfer fromvacuum interrupter moving contactto three-position switch
Medium-Voltage Gas-Insulated SwitchgearVacuum Interrupter
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© Siemens Industry, Inc. 2016.Page 29 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Ring-core currenttransformers:• Current transformers
located outside gaszone
• Secondary partaccessible outsidethe enclosure (& gaszone) withoutexposure to primaryvoltage
• Free of dielectrically-stressed cast-resinparts
A
C
B
A
Medium-Voltage Gas-Insulated SwitchgearCurrent Measurement
Current transformerinstallation
(basic scheme)Item Description
AFeeder currenttransformer on thecable housing
BFeeder currenttransformer on thecable
C Busbar currenttransformer
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• Mounted separately & connected via aplug-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 transformerwith primary fuse
Medium-Voltage Gas-Insulated SwitchgearLine-Side (Cable-Side) Voltage Transformer
Item Description
1 Bus connected VT
2 Cable connected VT
1
2
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© Siemens Industry, Inc. 2016.Page 31 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
• Internal cone type plug-in connectionsper EN-50181/DIN 47637
• Sizes available up to 1,250 A perconductor (cable) and up to2,500 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, withoutvoltage detection tap
Medium-Voltage Gas-Insulated SwitchgearPlug-In Cable Termination System
2014
© Siemens Industry, Inc. 2016.Page 32 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Medium-Voltage Gas-Insulated SwitchgearLow Maintenance Over Life Cycle
Types 8DA10/8DB10
Visual inspection Every 5 years
Conditioninspection
Every 10 years
MaintenanceAfter 1,000 operating cycles of the disconnectors &
grounding switches or after 10,000 operating cycles of thecircuit 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
2014
© Siemens Industry, Inc. 2016.Page 33 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Medium-Voltage Gas-Insulated SwitchgearMaintenance Checks
Visualinspection
Conditioninspection Maintenance Description
X X X Check & document SF6 gas pressure
X X Check & document dew-point (humiditycontent) (≤15 ˚C)
X X Check & document gas quality(air content) (SF6 share ≥ 95%)
XCheck operating mechanism & interlockingof disconnector & grounding switch. Ifrequired, grease linkage & bearings.
X Vacuum circuit breaker operatingmechanism
2014
© Siemens Industry, Inc. 2016.Page 34 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Dielectric withstandin relation to gaspressure/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 gaugepressure
0
ANSI rated 60 Hz withstand
ANSI rated impulse (BIL)
30
Switching undernormal conditions still
possible
Medium-Voltage Gas-Insulated SwitchgearDielectric Withstand
Normal atmospheric pressure
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 SwitchgearConsider These Investment Decision Advantages
Spare Parts
2014
© Siemens Industry, Inc. 2016.Page 36 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Questions Answers
Can the circuit breaker interrupt ifthere is a leak and no SF6 gas isavailable?
Yes, the vacuum interrupters areindependent of the SF6 gas and all theinterruption occurs inside the vacuuminterrupters. SF6 gas is only used forinsulation.
What is the SF6 leakage rate inSiemens MV GIS 8DA/B?
The low leakage rate is possible asthe normal pressure is 1.5 bar (22psig) or less, and the SF6 gas is usedonly for insulation, not for interruption.Leakage is below 0.1% per year.
Go-To-MarketFAQs
2014
© Siemens Industry, Inc. 2016.Page 37 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Questions AnswersIs SF6 a greenhouse gas “GHG”? Yes, SF6 is a GHG with atmospheric
lifetime of 3,200 years.Are there any taxes applicable on useof SF6 gas in MV switchgear or anyregulatory requirements?
No, users are required to reportannually SF6 volume if their inventoryexceeds 17,800 lbs at any time.
How do I quantify 17,800 lbs of SF6gas in terms of number of sections?
8DA10 ~ 2,700 sections8DB10 ~ 1,400 sections
What is the percentage of emissionsof SF6 gas from T&D equipmentscompare to the total emissions of allthe gases in the U.S.?
In 2013, total emissions of all GHGreported was 5,791.2 MMT CO2equivalent. Emissions from T&Dequipments were 5.1 MMT CO2equivalent. Net emission from T&Dequipment was < 0.1% (5.1/5,791.2)
Go-To-MarketFAQs
2014
© Siemens Industry, Inc. 2016.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: 8DBƒ Number of sections: 4ƒ Voltage: 25 kVƒ Short-circuit current: 40 kAƒ Year of installation: 2009
2014
© Siemens Industry, Inc. 2016.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: 8DAƒ Number of sections: 50ƒ Voltage: 4.16 kV and
26.4 kVƒ Short-circuit current: 40 kAƒ Year of installation: 2001
2014
© Siemens Industry, Inc. 2016.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: 8DAƒ Number of sections: 40ƒ Voltage: 13.8 kVƒ Short-circuit current: 40 kAƒ Year of installation: 2008
(shown during installation)
2014
© Siemens Industry, Inc. 2016.Page 41 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Reference project in Oil and Gas/Refinery
Customer information
ƒ Customer: ConocoPhillipsƒ Location: Wood River,
Illinois
Project information
ƒ Equipment type: 8DAƒ Number of sections: 54ƒ Voltage: 38 kVƒ Short-circuit current: 40 kAƒ Year of installation: 2009
2014
© Siemens Industry, Inc. 2016.Page 42 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Reference project in Oil and Gas/Refinery
Customer information
ƒ Customer: HovensaRefinery
ƒ Location: St. Croix, U.S.Virgin Islands
Project information
ƒ Equipment type: 8DAƒ Number of sections: 54ƒ Voltage: 38 kVƒ Short-circuit current: 40 kAƒ Year of installation: 2005
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Reference project in Oil and Gas/Extraction
Customer information
ƒ Customer: CanadianNatural Resources Ltd. -Horizon Oil Sands
ƒ Location: Alberta, Canada
Project information
ƒ Equipment type: 8DAƒ Number of sections: 265ƒ Voltage: 5 kV, 15 kV and
38 kVƒ Short-circuit current: 40 kAƒ Year of installation: 2005
2014
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Reference project in Higher Education
Customer information
ƒ Customer: NOVASoutheastern UniversityLocation: Florida
Project information
ƒ Equipment type: 8DAƒ Number of sections: 265ƒ Voltage: 4.16 kV and 13.8 kVƒ Short-circuit current: 40 kAƒ Year of installation: 2009
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Manufacturing Location
Siemens MV GIS Manufacturing in Frankfurt (SWF): The Home of GIS!
2014
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Medium-Voltage Gas-Insulated Switchgear
GIS
compared to
AIS
Unrestricted © Siemens Industry, Inc. 2016 Usa.siemens.com/mediumvoltage
Fixed-type, gas-insulatedmedium-voltage switchgearcompared to air-insulated switchgear
Technology comparison
2016
May-2016
Unrestricted © Siemens Industry, Inc. 2016Page 48 EMMS-T40042-00-4AUS / EM MS U.S.
MV AIS
• Drawout type construction, wherecircuit isolation is achieved byopening the circuit breaker andthen racking it to the test ordisconnect position.
• No built-in circuit groundingcapability. Grounding of loadcircuit requires drawout groundand test device.
MV GIS
• Fixed-mounted circuit breakerswith interlocked isolation switchand grounding switch. Isolationmeets NEC visible disconnectrequirement.
• Grounding accomplished withgrounding switch and circuitbreaker with fault-makingcapability. Sequentialinterlocking prohibitsmis-operation.
MV GIS Comparison To MV AIS
May-2016
Unrestricted © Siemens Industry, Inc. 2016Page 49 EMMS-T40042-00-4AUS / EM MS U.S.
MV AIS
• Drawout type construction,requiring physical movement ofcircuit breaker from connected totest or disconnect position.
• Historic experience suggestshigher potential for failuresassociated during racking.
MV GIS
• GIS achieves isolation without themovement of the circuit breaker,eliminating the potential formisalignment.
MV GIS Comparison To MV AIS
May-2016
Unrestricted © Siemens Industry, Inc. 2016Page 50 EMMS-T40042-00-4AUS / EM MS U.S.
MV GIS Comparison To MV AIS
MV AIS
• Conventional-type cabletermination (cable lugs and stresscones), exposed to contaminants
MV GIS
• Plug-in type cable termination,which provides IP65 protectionand easy installation at site
May-2016
Unrestricted © Siemens Industry, Inc. 2016Page 51 EMMS-T40042-00-4AUS / EM MS U.S.
Siemens MV GIS Advantages
MV GISoffers the
advantagesof a
switchingdevice -
a minimumnumber of
partsresulting in
a highMTBF
1. No regular maintenance1. Visual inspection: 5 years2. Status inspection: 10 years3. Maintenance after 10,000
operations2. 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 design7. 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-voltageparts. 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.
May-2016
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Footprint comparison (MV AIS & MV GIS - only equipment size considered)
38 kV
15 kV
MVAIS
MVGIS
MVGIS
MVAIS
Space saving~75% ~55%
MV GIS Smaller Than MV AIS – Compact Footprint
Single buscomparison
May-2016
Unrestricted © Siemens Industry, Inc. 2016Page 53 EMMS-T40042-00-4AUS / EM MS U.S.
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 cablesections
• Clean the sections and all insulation, and check allbolted connections
• Lubricate all bearings and surfaces; check panelfunction 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., $14,400for 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 ofservice.
• Provisions for alternative supply circuitsmust 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 theswitchgear (including potential for arcfault) 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 activeparts 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 provide125 kV BIL at 6,562 ft (2,000 m). Since this cannot bereached with 27 kV AIS, 38 kV AIS is required, whichmeans 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 atrear
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 switchgearspace requirements
single bus comparisonAir-insulated switchgear99.3 ft2 = 9.2 m2
Gas-insulated switchgear22.7 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 applicableto MV GIS
Estimated50% offailurecauses notapplicablewithMV GIS
MV AISfailure cause
Ove
rvie
wof
failu
reca
uses
forM
VA
IS
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MV GIS Advantages – 150 kV BIL
MV AIS
Due to the requirement of 150 kV BIL at27 kV, the switchgear selection should beupgraded to the next voltage level.
This BIL value cannot be reached withtypical 27 kV switchgear.
Therefore, 38kV switchgear is required,which means higher costs for thecustomer:
• Higher equipment costs
• Much higher costs for real estate.
MV GIS
• Same design & footprint for voltages up to40.5 kV
• No environmental influences due tomaintenance -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, sparesneeded.
•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 ofspares, no additional storage room,handling cost and cost of staff.
2014
© Siemens Industry, Inc. 2016.Page 61 IC1000-F320-A121-X-4A00 Murtaza Khan MS U.S.
Thank You
Murtaza Hussain [email protected]
+1 346 206 9980