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. 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


• 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

2014


• 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


• 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


Medium-Voltage Gas-Insulated Switchgear8DA10 Single Busbar Lineup Up To 42 kV

Frontview

Available at Koontz Wagner,6510- Bourgeois Houston, TX 77066

2014


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. 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

2014


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


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


• 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


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


UL/cUL Listed* asarc resistant toANSI/IEEE C37.20.7-2007

* Ratings dependent

Medium-Voltage Gas-Insulated SwitchgearUL Listed*

2014


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

2014


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

2014


Three-Position Selector SwitchMedium-Voltage Gas-Insulated SwitchgearThree-Position Selector Switch

OPEN

READY-TO-GROUND

CLOSED

2014


• 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


8DA/B ANSICamera housing and mounting

2014


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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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


3

2014


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


3

2

2014


Medium-Voltage Gas-Insulated SwitchgearView Port Via Video Camera

Use of PC toview position ofselector switch

2014


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

2014


CircuitOFF &

ISOLATED

Ready ToGround

CircuitGROUNDED

CircuitCLOSED

Medium-Voltage Gas-Insulated SwitchgearThree-Position Selector Switch

2014


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


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


• Vacuum interrupter mounted incircuit breaker pole housing

• Non-sliding current transfer fromvacuum interrupter moving contactto three-position switch

Medium-Voltage Gas-Insulated SwitchgearVacuum Interrupter

2014


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

2014


• 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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• 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


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


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

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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

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


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


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


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


Reference project in Pharmaceutical


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


Reference project in Heavy Industry/Manufacturing


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


Reference project in Oil and Gas/Refinery


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


Reference project in Oil and Gas/Refinery


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

2014


Reference project in Oil and Gas/Extraction


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


Reference project in Higher Education


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


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. 2016 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


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.


May-2016



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


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


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


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

May-2016


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

May-2016


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.

May-2016


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

May-2016


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

May-2016


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

May-2016


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.

May-2016


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


Thank You

Murtaza Hussain [email protected]

+1 346 206 9980

Siemens MV GIS Switchgear

Engineering

Transcript of Siemens MV GIS Switchgear