comparisons between iec vs ansi switchgear.pdf

Arne Ar ney y Ka Kane nerr - Ma May y 3, 3, 201 2013 3

SpotLIGHT Webinar  ompar so sons e ween an  ANSI/IEEE switchgear features © ABB Inc. May 2, 2013 2013 | Slide 1

 ANSI vs. IEC standards

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IEC = International Electrotechnical omm ss on 

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Founded in 1904 in St. Louis, MO Reco nized b the Wo Worl rld d Tr Trade Organization Consists of over 50 National Com Co mmi mitt ttee ees, s, ea each ch ha hav vin e ua uall vot otin in rights Represents 85 % of the world’s population and 95 % of the electric energy produced and consumed

Potential customer profile and application

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Self-insured entities, such as an Electric Utility.

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Large, heavy industrial enterprise , i.e. aluminum smelter, steel mill, refinery.

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Ex erience and willin ness to work with the local electrical ins ector.

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Confined space – need “front access only” type of equipment

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Non-Standard system voltage, i.e. 16kV, 24kV

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Customer wants to have a grounding switch for outgoing feeders.

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Equipment ratings do not exceed 600A/31.5kA, since within these ratings IEC switchgear has dimensional advantages.

 ANSI vs. IEC standards

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Medium Voltage Switchgear  

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 ANSI C37 vs. IEC 62271

Low Voltage Switchgear  

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Degree of protection per IEC 60529 Protection against ingress of solid foreign objects

Degree of protection per IEC 60529 Protection against harmful ingress of water 

 ANSI vs. IEC standards

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Motor Control Center  

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IEC: No differentiation one common standard

Temperature ratings 

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 ANSI/UL: Different standards for Switchgear and Motor Control Centers

 ANSI: Ambient temperature between -30°C and +40°C IEC: Maximum of +40°C (options for +50/55°C) and minimum of -5°C (options for -15/25°C)

Installation 

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 ANSI: Indoor and outdoor IEC: Indoor only

 ANSI vs. IEC standards

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Interlocking 

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IEC: General rules, electro-mechanic interlocking preferred

nc osure 

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 ANSI: Specific rules; key-interlocking preferred

 ANSI: Differentiation between enclosure and vent openings, minimum thickness IEC: No differentiation and no specification

Insulation 

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IEC: Busbar design left to the manufacturer 

 ANSI vs. IEC standards

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Instrument Transformers 

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 ANSI: Window-type current transformers on both sides of the circuit breaker  IEC: Cast resin current transformers on line-side of the circuit breaker  Option for non-traditional current and voltage sensors in IEC switch ear 

Low Voltage Compartment 

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 ANSI: Depending on specific designs, there may not be a LV  – breaker compartment door  IEC: LV compartment with metallic separation from HV

 ANSI vs. IEC standards

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Electromagnetic Compatibility 

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IEC: General rules, electro-mechanic interlocking preferred

e ec r c es ng 

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UL: No specification

UL: No BIL test required, lower power frequency test voltage IEC: BIL test with 1.2/50 re uired, hi her ower fre uenc test voltage

Clearances 

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IEC: Creepage distances defined based on material quality, clearances defined based on over-voltage category

Definitions - IEC 62271

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Compartment Accessibility 

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Interlock-controlled accessible Procedure-based accessible oo - ase access Non-accessible

e

Definitions - IEC 62271

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Loss of Service Continuity 

LSC1 

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LSC2A 

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1

LV Compartment

2

Pressure Relief Duct (optional)

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Circuit Breaker Compartment

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Cable Compartment

Switchgear must be completely de-ener ized before o enin circuit breaker compartment

, functional units adjacent to the one to be opened can remain energized

LSC2B 

 As LSC2A, but cable energized

Definitions - IEC 62271

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Internal Arc Classification 

 Accessibility: A, B or C – front / lateral / rear  

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 A (F, L, R): to authorized personnel B (F, L, R): to all installation

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Test values 

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Test current in kilo-amperes (kA) Duration in seconds (s)

Definitions - IEC 62271 / 61641

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Test Criteria for Personnel Protection 

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Doors must remain closed and no opening of the cover panels must occur  No hazardous arts to be e ected No holes in the external housing in any parts accessible to personnel

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incinerate 

 All earthing connections must remain effective

Definitions - VDE0660 part 500

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Test Criteria for Plant Protection (incl. System Function) 

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 Arc must be limited to defined area and must not re-ignite in adjacent units Emer enc o eration of the switch ear ossible after fault has been repaired and/ or respective functional units of the defined area have been isolated or removed

Differences between IEEE and IEC AR testing

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The two largest differences between the IEEE C37.20.7 and the IEC ² IEC Type B accessibility. IEEE C37.20.7 testing used 150gm/ m² cotton material for all accessibility ratings of 2, 2B and 2C and 2BC. In addition, we place all test cloths 10cm from the front and sides of the . The IEEE testing guide defines the Rating Basis as the rated short time current of the equipment. The testing guide permits a minimum of 10-c cles 0.167s throu h a maximum of 30-c cles 0.5s of rated arc duration. The minimum duration of 0.167s is designed as an arcfault test for resistance of the switchgear to pressure increase. This tests the ability to contain the explosive forces until the expanding gas is relieved in a controlled manner and for burn-throu h of the arcin erosion of the switchgear walls until most relaying will remove the source of the fault. The maximum test duration of 0.5s establishes a longer time duration to show burn-through resistance for longer relay coordination before the fault source is removed .

IEC vs. IEEE arc-resistant requirements IEC 62271-200 vs. IEEE C37.20.7 ARC-RESISTANT REQUIREMENTS

Requirement

IEEE C37.20.7

IEC 62271-200

Test Voltage

Same as equipment

Same as equipment

. x rms

. x rms

es

urren pea

Test Duration

167ms for pressure 0.5 sec for burn-through

167ms for pressure 1 sec for burn-through*

 Arc- Initiation

0.5mm diameter wire

0.5mm diameter wire

Indicators

150g/m / m² all Types 150mm x 150mm frame

150g/m / m² Type A 40g/m / m² Type B * 150mm x 150mm frame

2 meters high

. B. front / sides 10cm away C. front / side / adjacent 10cm away *

. B. facing surfaces 10cm away

 ANSI vs. IEC standards

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For Switchgear ANSI / UL and IEC have very different philosophies 

IEC Standards DO… 

an ar s

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…define fabrication techniques and material solutions

Neither ANSI / UL nor IEC is “better” 

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…define requirements for performance and testing

Note, however, that UL does not define arc-resistance

Do not try to “mix and match” ANSI /UL and IEC standards

IEC Switchgear 

© ABB Inc. May 2, 2013 | Slide 19

IEC Switchgear 

© ABB Inc. May 2, 2013 | Slide 20

UniGear ZS1 single level section view

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Unit compartments 

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© ABB Inc. May 2, 2013 | Slide 21

 A Circuit-breaker compartment B Main Bus compartment a e compar men D Low voltage compartment E Compact gas duct channel

 ABB UniGear 

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Passive Arc Protection 

Design to withstand the thermodynamic stress of an internal arc 

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Se mentation into com artments Mechanical rigidity Pressure relief with arc duct Protective relaying

 Active Arc Protection (optional) 

exposure to an internal arc 

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Pressure sensors Combination of optical and current sensors

 ABB UniGear 

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Vacuum circuit breakers 

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Spring mechanism Magnetic actuator 

Fused vacuum contactor 

 ABB UniGear 

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Conventional current and voltage transformers Innovative current and voltage sensors 

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Large dynamic range nsens ve o erroresonance an voltage components Short-circuit proof  Short delivery

Questions to ask the customer to identify opportunity

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Would your insurance carrier recognize non-UL listing/certificate? xamp es: ; ana a Would you work with your local electrical inspector to get a permit?  ABB will provide all required technical support.

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If the switchgear is installed against the wall, and does not require rear access – would it solve your problem?

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s e es gn oa w n an e ava a e s or c rcu curren does not exceed 31.5kA? ABB’s IEC switchgear would save both space and money.

© ABB Inc. May 2, 2013 | Slide 25

Contact information

If you have further questions , please contact me: PRESENTER

Arney Kaner, PE

COMPANY

ABB Inc.

PHONE

(847) 486-1290

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© ABB Inc. May 2, 2013 | Slide 26

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