FF Surge Protection

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Surge and Lightning Protection

For Foundation Fieldbus

Presented By:

David Crandall MTL, Inc.

Foundation Fieldbus End User Council

North America MeetingSan Ramon, California

June 5, 2003


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...dedicated to a single international fieldbus.

FIELDBUS FOUNDATION END USER COUNCIL Meeting San Ramon, California June 5, 2003 2003 Fieldbus Foundation

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What are Voltage Transients and Surges and why

should they concern me?


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Why consider Surge Protection for

Foundation Fieldbus

Daisy-Chain

Host

Link Active Scheduler

Buswith Spurs

JunctionBox

Chicken footOne to One


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SafeOperating

Area

Equipment

Degradation

Catastrophic

Failure

Failure Modes of Equipment


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Electrical Equipment has high

MTBF

Temperature Extremes (Heat and Cold)

Extraneous Matter (Dirt, Dust, Grease, etc.)Surges

Factors that will shorten

equipment life are:


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Magnified view of 2 junctions in an IC chip

IC Chip Failure due to junction breakdown

Typical Degradation

(+) 5 volt signal (-) Logic groundInsulationBreakdown

Point

50 volts


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Failure of a Bipolar Transistor

Transient Voltage Damage


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Damage to discrete Semiconductor devices


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Damage to Integrated Circuits


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How Surges Enter AC Power Wires

UPS

Motors

Contactors

Breaker

Panels


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UPS Power is vulnerable to Surges

Any Inductive Load

Power Tools

Crossed WiresInduced Voltages


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What uses or is connected to power?

Man-Machine Interfaces

Controllers

DC Bulk Power Supplies

Power Conditioners

Repeaters

Field Instrumentation

UPS Systems

Any of these components are vulnerable to surgedamage


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>21

>16

>10

>8

>5

>3

>1

Measured Ground Flash Density


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Distance 100400 0

200 kV

15 kV3 kV

12kV

Ground Potential Shifts


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PC Board Damage


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The solution: Surge Suppressors

Surge Suppressors protect electronics from theeffects of:

Lightning strikes

Electrical Faults

Induced Voltages

Each device needs to be evaluated for Surgeprotection

Critical

High Replacement Cost

Overall impact if lost from a surge


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The Solution: Surge Suppressors

Protection should be considered for:

Field Devices

Power Supplies

Foundation Fieldbus H1 trunks

Repeaters

Man-Machine Interfaces

Comm ports such as: Ethernet


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Insulation Ratings of Equipment

Determines highest voltage equipment can withstand

without damage

Bulk Power Supplies 600 Volts

Industrial PCs 600 Volts

Controllers 600 Volts

Field Devices 500-1500 Volts

UPS systems 1000-6000 Volts

Surge suppressors must reduce voltage to less than

600 Volts!


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Design Criteria for Suppressors

Reduce surge voltage to a point that the

residual voltage is low enough for connected

equipment to survive

Assume 20kV surge

Divert Surge Current

Assume 10kA 8/20 Sec

Have minimal impact on the FF signals

Reset after use for next surge event


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Field Device Protection

Can be applied to any FF field

device

Design should add minimal

resistance to the linesCan be Installed in spare

conduit entry or tee

Some models mount

internally10kA Surge Current Capacity


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Trunk Protection

Designed to protect

Communication Trunk

Protects:

H1 Card Power Conditioner

Terminators

Repeaters

Series connection

20kA Surge Current Capacity


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AC/DC Power Surge Suppressor

Designed to protect incoming

power lines to:

Power Conditioners

Bulk power supplies

Panel mounted equipment

AC or DC Single phase power

protection

Noise Filtering recommended


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Located at the Service &Breaker Panels

Protects UPS systems,

and equipment powered

from breaker panels

Facility Power Protection


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AC Power Protection

Bulk Power

Supply

UPS SystemPower Conditioner

H1 Controller

Control

Power

Service Entrance


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Trunk Protection

Distance 100400 0

200 kV

15 kV

3 kV

12kV


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Trunk Protection


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400 Distance 100 0

200 kV

15 kV3 kV

12kV

Spur Protection


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Summary

Equipment is vulnerable to Surge Damage:

Protect all devices with incoming AC power

Install surge suppression on field devices

Protect equipment located on the segments

FF Surge Protection

Documents

Transcript of FF Surge Protection