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SpotLIGHT Webinar Arney Kaner - May 3, 2013
ompar sons e ween an ANSI/IEEE switchgear features
© ABB Inc.
May 2, 2013 | Slide 1
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ANSI vs. IEC standards
IEC = International Electrotechnical
omm ss on
Founded in 1904 in St. Louis, MO
Reco nized b the World Trade
Organization
Consists of over 50 NationalCommittees, each havin e ual votin
rights
Represents 85 % of the world’s
population and 95 % of the electric
energy produced and consumed
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Potential customer profile and application
• Self-insured entities, such as an Electric Utility.
•
Large, heavy industrial enterprise , i.e. aluminum smelter, steel mill,refinery.
• Ex erience and willin ness to work with the local electrical ins ector.
• Confined space – need “front access only” type of equipment
• Non-Standard system voltage, i.e. 16kV, 24kV
• Customer wants to have a grounding switch for outgoing feeders.
• Equipment ratings do not exceed 600A/31.5kA, since within these
ratings IEC switchgear has dimensional advantages.
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ANSI vs. IEC standards
Medium Voltage Switchgear
ANSI C37 vs. IEC 62271
Low Voltage Switchgear
, , vs.
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Degree of protection per IEC 60529
Protection against ingress of solid foreign objects
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Degree of protection per IEC 60529
Protection against harmful ingress of water
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ANSI vs. IEC standards
Motor Control Center
ANSI/UL: Different standards for Switchgear and Motor Control
Centers
IEC: No differentiation one common standard
Temperature ratings
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
ANSI: Indoor and outdoor
IEC: Indoor only
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ANSI vs. IEC standards
Interlocking
ANSI: Specific rules; key-interlocking preferred
IEC: General rules, electro-mechanic interlocking preferred
nc osure
ANSI: Differentiation between enclosure and vent openings,
minimum thickness
IEC: No differentiation and no specification
Insulation
IEC: Busbar design left to the manufacturer
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ANSI vs. IEC standards
Instrument Transformers
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
ANSI: Depending on specific designs, there may not be a LV
–breaker compartment door
IEC: LV compartment with metallic separation from HV
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ANSI vs. IEC standards
Electromagnetic Compatibility
UL: No specification
IEC: General rules, electro-mechanic interlocking preferred
e ec r c es ng
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
IEC: Creepage distances defined based on material quality,
clearances defined based on over-voltage category
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Definitions - IEC 62271
Compartment Accessibility
Interlock-controlled accessible
Procedure-based accessible
oo - ase access e
Non-accessible
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Definitions - IEC 62271
Loss of Service Continuity
LSC1
Switchgear must be completely
de-ener ized before o enin
circuit breaker compartment
LSC2A
,
functional units adjacent to the
one to be opened can remain
energized
LSC2B
As LSC2A, but cable
1 LV Compartment
Pressure Relief Duct (optional)2
energizedCircuit Breaker Compartment
Cable Compartment
4
5
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Definitions - IEC 62271
Internal Arc Classification
Accessibility: A, B or C – front / lateral /
rear
A (F, L, R): to authorized
personnel
B (F, L, R): to all
installation
Test values
Test current in kilo-amperes (kA)
Duration in seconds (s)
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Definitions - IEC 62271 / 61641
Test Criteria for Personnel Protection
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
incinerate
All earthing connections must remain effective
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Definitions - VDE0660 part 500
Test Criteria for Plant Protection (incl. System Function)
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
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Differences between IEEE and IEC AR testing
The two largest differences between the IEEE C37.20.7 and the IEC²
IEC Type B accessibility. IEEE C37.20.7 testing used 150gm/ m²cotton material for all accessibility ratings of 2, 2B and 2C and 2BC. Inaddition, 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 minimumof 10-c cles 0.167s throu h a maximum of 30-c cles 0.5s of ratedarc duration. The minimum duration of 0.167s is designed as an arc-fault test for resistance of the switchgear to pressure increase. Thistests the ability to contain the explosive forces until the expanding gasis relieved in a controlled manner and for burn-throu h of the arcin
erosion of the switchgear walls until most relaying will remove thesource of the fault. The maximum test duration of 0.5s establishes alonger time duration to show burn-through resistance for longer relaycoordination before the fault source is removed.
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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
es urren pea . x rms . x rms
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 Types150mm x 150mm frame
150g/m / m² Type A40g/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
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ANSI vs. IEC standards
For Switchgear ANSI / UL and IEC have very different philosophies
IEC Standards DO…
…define requirements for performance and testing
an ar s …
…define fabrication techniques and material solutions
Neither ANSI / UL nor IEC is “better”
Note, however, that UL does not define arc-resistance
Do not try to “mix and match” ANSI /UL and IEC standards
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IEC Switchgear
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May 2, 2013 | Slide 19
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IEC Switchgear
© ABB Inc.
May 2, 2013 | Slide 20
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UniGear ZS1 single level section view
Unit compartments
A Circuit-breaker compartment
B Main Bus compartment
a e compar men
D Low voltage compartment
E Compact gas duct channel
© ABB Inc.
May 2, 2013 | Slide 21
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ABB UniGear
Passive Arc Protection
Design to withstand the thermo-
dynamic stress of an internal arc
Se mentation into com artments
Mechanical rigidity
Pressure relief with arc duct
Protective relaying
Active Arc Protection (optional)
exposure to an internal arc
Pressure sensors
Combination of optical and current
sensors
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ABB UniGear
Vacuum circuit breakers
Spring mechanism
Magnetic actuator
Fused vacuum contactor
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ABB UniGear
Conventional current and voltage transformers
Innovative current and voltage sensors
Large dynamic range
nsens ve o erroresonance an
voltage components
Short-circuit proof
Short delivery
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Questions to ask the customer to identify opportunity
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.
• If the switchgear is installed against the wall, and does not require rear
access – would it solve your problem?
• 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
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Contact information
If you have further questions , please contact me:
PRESENTER Arney Kaner, PE
COMPANY ABB Inc.
PHONE (847) 486-1290
- . . .
© ABB Inc.
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