BEST_EntelliGuard-TU

Trip Unit Technologies & Arc Flash Solutions from GE

End The Reliability & Protection Compromise

March, 2009By Darrin K Bock

Flexible Options to upgrade your existing gear to the latest

EntelliGuard TU

2GEM. Valdes – Train the Expert – Arc Flash Lesson 3September 16, 2008

EntelliGuard® TU• Arc Flash and Selectivity at the same time

• ZSI - short time, ground fault and instantaneous

• Reduced Energy Let Thru (RELT)• Create the curve shape that best

suits your system’s need (fuse-like Long Time and Ground curves)

• A large backlit LCD screen makes set-up easier in difficult environments

• Metering, Relaying, WaveForm Functions

• Universal Rating Plug (and trip unit Ent G)

• Modbus or Profibus (Comnet is gone)

• Flexible programmable inputs/2 outputs for needs such as Load shedding, ground fault alarm, trip indication and many others

• Plug and play compatibility with 4 previous generation power circuit breakers – PowerBreak I, PowerBreak II, AKR and WavePro

• Available in kit format to modernize Westinghouse, I-T-E, and Allis Chalmers circuit breakers

ANSI, UL, IEC

Modern Circuit Breaker Technology

March, 2009By Darrin K Bock

• Reduced Energy Let – ThruReduced Energy Let – Thru

• Flexible Time Current Curves to “fit” all your needsFlexible Time Current Curves to “fit” all your needs

• Advanced Instantaneous AlgorithmAdvanced Instantaneous Algorithm

• ZSI (Zone Selective Interlock) – now has ZSI (Zone Selective Interlock) – now has InstantaneousInstantaneous

Enables…. Arc Flash and Selectivity at the Same Time


Arc Flash Hazard Overview

Arc Flash energy is a function of:

• Voltage

• Available short circuit current

• Working distance

• Arc gap

• Arcing fault clearing time (not short circuit clearing time)

• Sensitivity Clearing time is the only parameter than can be modified after

the power system design is set. Therefore….

• Fixed

• Based on system design and source

• Arms are only so long

• Determined by equipment type

• A function of the protective device acting upon the arcing current

Arcing fault clearing time becomes the critical factor

SourceHeat

Measurement

Arcing current RMS & peak magnitude, &

time

• Working Distance

• Voltage• Av ailable Short

Circuit Current

• Time to clear

• Electrode Gap

• Enclosure

SourceHeat

Measurement

Arcing current RMS & peak magnitude, &

time

• Working Distance

• Voltage• Av ailable Short

Circuit Current

• Time to clear

• Electrode Gap

• Enclosure

Figure 1


RELT (Reduced Energy Let-Through) Instantaneous Trip Setting

Separate independent adjustable instantaneous pickup:

• 1.5X-15X or max Instantaneous Pick Up of CB if less

• ½ cycle faster than normal Instantaneous Pick Up

• Overrides all other higher pickups

• Operated via a Remote Switch or Modbus Communications

RELT – Reduced Energy Let ThruRELT – Reduced Energy Let Thru

Aka; Maintenance Switch, ARMS, Safety Setting, Arc Flash Switch, Alternate Setting… Used when performing maintenance or other live work to improve protection


GTU Curve, CB1 & CB2

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sRELT TCC

RELT OFF

RELT ON


RELT Wiring with Positive Indication

RELT Control Power Available indication

RELT Control switch must be 2 position lockable in “ON” position. Lock suitable for LOTO procedures, 3/8” hasp.

Actual Trip, CB and harness connections not shown, will vary by CB type and mounting style

Position of switch and indicating lights may be in equipment or remote.

RELT indicating lights are long life LED.

GE will provide a 3 position switch with built in blue light.

24V

RELT ManualInput Switch

RELT Feedback from Trip

RELT On Light

RELT Ctrl Pwr Available

Light 24V ACor DC

ON

OFF

Trip Unit

TB for user wiring


Flexible Time Curves GTU Curve, CB1 & CB2

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1) Plugs: 37.5-100% sensor. LTPU 50-100% Plug – Universal Rating Plugs

2) CB & Fuse Shaped LT Bands

3) 22 LT delays in both CB & Fuse shapes, 44 total

4) STPU:1.5-12X LTPU, (0.05 increments)

5) STI2T slope: 3 different slopes

6) ST TB: As fast as 1.5 Cycles, 11 different bands, in 55ms increments

7) Instantaneous pickup 2X-15X standard, 1.5-30X optional in ANSI GACB.

more precision in settings and tolerances


Minimum and maximum LT delaysGTU Curve, CB1 & CB2

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ST PU and Delays

Note fast 25 millisecond ST delay, clearing time well under 100mS!

Note that upper ST band intersects LT band with “no” vertical transition!• Lots of flexibility• Faster protection• Lots of range• But some unusual

combinations are possible


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Envelope/Standard = Envelope 1/ANSI ST PU = 1.5 X LTPU I PU = 30 X Trip Rating PlugExt RangeOverride = 65000A ST TD = Min STDB Net I PU I = 30000A

Sensor = 1600A ST Slope = OFF RELT I PU = OFFPlug = 1000A ST PU = 1500A In zone Fault Net RELT I = 0A

LT PU = 1 X Plug LT PU = 1000A NO GF Tol =15%

LT TD = Min CB GF = OFF 0A PU Slope = I2T 3rdTD BandEnvelope/Standard = 1/ANSI ST PU = 12 X LTPU ZSI I PU = 30 X Trip Rating Plug Ext Range

Override = 65000A ST TD = Max STDB 5th STDB Net I PU I = 30000ASensor = 2000A ST Slope = OFF OFF RELT I PU = OFF

Plug = 1000A ST PU = 12000A Net RELT I = 0A

LT PU = 1 X Plug LT PU = 1000A IPU ZSI = ON GF Tol =15%

LT TD = C-2 GF = OFF 0A PU Slope = OFF MinimumTD BandGF ZSI =--------------------------------------------> Slope = SGF 3rdTD Band

CB1-Fault CB2 Restrained Response

CB1 - 60Hz

CB2 - 60Hz


ST Slopes

3 different slopes available

K=I2t = slope definition

K = 2, 8, & 18

Shown are 2 and 18, 8 falls in between


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Envelope/Standard = Envelope 1/ANSI ST PU = 1.5 X LTPU I PU = 30 X Trip Rating PlugExt RangeOverride = 65000A ST TD = Min STDB Net I PU I = 30000A

Sensor = 1600A ST Slope = Min RELT I PU = OFFPlug = 1000A ST PU = 1500A In zone Fault Net RELT I = 0A

LT PU = 1 X Plug LT PU = 1000A NO GF Tol =15%

LT TD = Min CB GF = OFF 0A PU Slope = I2T 3rdTD BandEnvelope/Standard = 1/ANSI ST PU = 2.5 X LTPU ZSI I PU = 30 X Trip Rating Plug Ext Range

Override = 65000A ST TD = 5th STDB 5th STDB Net I PU I = 30000ASensor = 2000A ST Slope = Max OFF RELT I PU = OFF





CB1 - 60Hz

CB2 - 60Hz


Adjustable Selective Instantaneous


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Envelope/Standard = Envelope 1/ANSI ST PU = 1.5 X LTPU I PU = 2 X Trip Rating PlugOverride = 65000A ST TD = Min STDB Net I PU I = 2000A


LT PU = 1 X Plug LT PU = 1000A NO GF Tol =15%LT TD = Min CB GF = OFF 0A PU Slope = I2T 3rdTD Band

Envelope/Standard = 1/ANSI ST PU = 3 X LTPU ZSI I PU = 30 X Trip Rating Plug Ext RangeOverride = 65000A ST TD = 4th STDB 5th STDB Net I PU I = 30000A

Sensor = 2000A ST Slope = OFF OFF RELT I PU = OFFPlug = 1000A ST PU = 3000A Net RELT I = 0A




CB1 - 60Hz

CB2 - 60Hz

2X to 15 or 30X plug available but may be limited by Icw.

Note 3 cycle clearing and 12mS commit drawn above the 0.01 axis.

The 0.012S differentiates the HSIOC (override), drawn down to 0.01S.

The 12mS should not be used like a traditional commit time.


GF4 different shapes.

Right up against what the standards allow.

The double knee shape is specially good for selectivity purposes.

Maximum 1200A or 60% of sensor, whichever is less.

Minimum is 20%, 10% IEC.


3000A, 1 Second

150%, 2 Seconds

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3000A, 1 Second

150%, 2 Seconds

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I2t

SGF

Definite time (no slope)

I4t


GF Selectivity

800A CB fits under 1200A GF.

ST pick up is at 1.5X & I2t slope is minimum . . . But it is possible even without ZSI


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LT PU = 1 X Plug LT PU = 0A NO GF Tol =15%LT TD = C-5 GF = 0.6 X Sensor 1200A PU Slope = SGF 2ndTD Band

Envelope/Standard = 1/ANSI ST PU = 1.5 X LTPU ZSI I PU = 5.5 X Trip Rating PlugOverride = 65000A ST TD = 4th STDB 5th STDB Net I PU I = 4400A

Sensor = 800A ST Slope = Min OFF RELT I PU = OFFPlug = 800A ST PU = 1200A Net RELT I = 0A




CB1 - 60Hz

CB2 - 60Hz



Adjustable Instantaneous “starts” at 12 mS clears at 50 in new CB,

Fastest short time band starts at 25mS and clear at 80mS or 88mS.

Faster Clearing Times


(80,000)

(60,000)

(40,000)

(20,000)

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Prospective

Let-through

Prospective fault current (Ibf)

Let-through I peak

Let-through I2t

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Advanced Instantaneous AlgorithmInstantaneous algorithm able to discern a fault current from a “peak” let-through. Filters out the wave shape that corresponds to the let-through of a current limiting OCPD (CB or fuse)



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Minimum selective IPU setting

Instantaneous Selectivity

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Transition

GTU selective settings based on the curve of the downstream current limiting molded case CB.

Depends on the MCCB curve being defined correctly.

Only instantaneous selectivity you can see on the curve


Safety features that reduce the risk of the arc flash hazard

• Two instantaneous settings, one for maximum selectivity and one for maximum safety (RELT)

• Zone Selective Interlocking simultaneously provides short time, ground fault and instantaneous selectivity with separate settings of the band to switch from & to

• Instantaneous Zone Selective Interlocking with overlapping instantaneous characteristics – a unique GE capability

• Selectivity up to 65, 85 or 100kA is available with instantaneous set at much lower values, while still clearing in less than 3 cycles



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1) ZSI I2t curves - 2) Can set restrained & unrestrained positions independently - 3) ZSI Instantaneous & ST independently


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I2t shifted

ST TDB shifted

Instantaneousshifted

ZSI (Zone Selective Interlock) –ZSI (Zone Selective Interlock) –InstantaneousInstantaneous Instantaneous zone selective interlocking so CBs can be kept protecting at instantaneous speeds while still maintaining selectivity up to 100kA


ZSI

Requires that each CB have the ST and GF bands set for the “restrained” and “unrestrained” positions. Same with slopes if used. One pick up setting.


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LT PU = 1 X Plug LT PU = 800A YES GF Tol =15%

LT TD = C-5 GF = OFF 0A PU Slope = SGF 2ndTD BandEnvelope/Standard = 1/ANSI ST PU = 1.5 X LTPU ZSI I PU = 6.5 X Trip Rating Plug

Override = 65000A ST TD = Min STDB 5th STDB Net I PU I = 10400ASensor = 1600A ST Slope = OFF OFF RELT I PU = OFF





CB1 - 60Hz

CB2 - 60Hz

Two separate settingsRestrainedUnrestrainedLower CB restrained and unrestrained should be =, though in theory, unrestrained is not required



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IZSI Provides Flexibility: Protection & selectivity simultaneously

Add ZSI, slope ZSI, Instantaneous ZSI and you have best in class selectivity and best in class arc flash protection


Arc Flash Performance depends on clearing time.

Trying to keep primary protection clearing fast without sacrificing selectivity


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CB1 - 1600ACB1 LTPU 1600ACB1 STPU 6400ACB1 IPU 21600ACB1 RELT IPU 999999ACB1 HSIOC 69892ACB1 0A GFNEC GF 3000A/1SGF1-0ACB2 - 3200AGF20A GF2Txfrmr inrushfuseR+ CB =GF 150% 2S480V Xfmr FLAHRC1HRC2HRC3HRC4IbfI arcing

Constant Energy line

Envelope/Standard = Envelope 1/ANSI ST PU = 4 X LTPU I PU = 13.5 X Trip Rating PlugOverride = 65000A ST TD = 3rd STDB Net I PU I = 21600A


LT PU = 1 X Plug LT PU = 1600A NO GF Tol =15%LT TD = C-8 GF = OFF 0A PU Slope = SGF 2ndTD Band

Envelope/Standard = 3/ANSI ST PU = 3 X LTPU ZSI I PU = 9 X Trip Rating PlugOverride = 100000A ST TD = Min STDB 6th STDB Net I PU I = 28800A

Sensor = 3200A ST Slope = OFF OFF RELT I PU = OFFPlug = 3200A ST PU = 9600A Net RELT I = 0A




HRC 2 for 480V, Solidly Grounded, Gap = 32mm (Swgr), Working Distance = 24" (610mm), Arc type = In a Box, Arcing Current (Ia) plotted = 42.9kA-36.4kA for 100kA bolted fault current (Ibf)

CB1 - 60Hz

CB2 - 60Hz

Selectivity & Arc Flash

EntelliGuard® TU Trip Unit

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