tvs lightning equip protection
TRANSCRIPT
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TVSS Lightning and
Equipment Protection
Presented by
Scott Peele PE
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TVSS Lightning and Equipment
Protection
What is a Surge or Lightning. Coupling on the electrical system
Understanding TVSS or SPD protection Grounding for Lightning
Recommended Practices
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What is a Surge?
A surge is a Transient
A Transient can be classified into twocategories, impulsive and oscillatory
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Impulsive
This is the category that TVSS (Transient
Voltage Surge Suppressor) SPD SurgeProtection Device) equipment is designedto mitigate.
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Sources of Transients
Lightning
Static Arc Welding
Switching
contactor
relays
SCRs
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Key
# of cloud toground flashes
per sq kM/year
1989-93 Ave Lightning Flash Density
http://Lightning Detection Network
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Lightning directly attaches and couples into power lines
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Internal Transient Sources
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A B C
UndergroundService Connection
OverheadServiceConnection
A B C
IEEE C62.41 Cat. C
IEEE C62.62
IEEE C62.1/11
IEEE C62.41 Cat. B
IEEE C62.62
UL 1449
IEEE C62.41 Cat. A
IEEE C62.62
UL 1449
Applicable Standards for surge protection at locations A, B and C
Location Exposure Categories for Surge
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0.001
0.01
0.1
0.5
1.0
61030
100
1000
10000
Cycles
Transient Suppressor Protection
Relative Performance
106%
87%
Nominal
Voltage
1
2
10
100
Seconds
300
200
100
0
Typical Energy Limitsof Suppressor
Clamping Level Determinedby Energy in Impulse and
Impedance of SourceLower Clamping Limit
Percent ofNominalVoltage
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Standard: 100-kHz Ring Wave Standard: Combination Wave
Simulates transients generatedby switching loads
0
0.2
0.4
0.6
40 80
0.8 Rise time = 1.2sec
Duration = 50 sec
Time in sec
20 60
1.0
-0.8
-0.4
0
0.4
20 40
0.8Rise time = 0.5 sec
10 sec
Time in sec
Simulates surges generated bydirect coupled from lightning
From: ANSI/IEEE Standard C62.41 &45
High energy
Lightning and Switching Standard ANSI/IEEE Test
Waveforms
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CategoryA3
CategoryB3
CategoryC3
6kV200A100kHz
6kV500A100kHz
6kV1.2/50 3kA8/20
20kV1.2/50sec 10kA8/20sec
Test Waveforms as Describedby ANSI / IEEE C62.41 -
1991
Test Waveforms as DescribedTest Waveforms as Describedby ANSI / IEEE C62.41by ANSI / IEEE C62.41 --
19911991
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SurgeCurrent
TVSS
ClampedSurge
Voltage
ProtectedLoad
Equipment
IncomingSurge
Voltage
Clamping Action of SPD or TVSS
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SPD Application Guide
Transient
Surge
SuppressionDevices
Data Lines Telecom
(Primary)
Telecom
(Secondary)
AC Power
Lines
DC Power &
Automotive
MOV
Avalanche
Diode
Gas
Tube/Gap
Typical Transient Surge Suppressor Applications
Harris Semiconductor
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Gas tube
symbol
Spark-over performance for
successive strikes at 10 kV/us,
100V and .02 us/small division
Gas Tube Suppressor Element
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Metal-oxide varistorsvarious ratings
same symbol
MOV clamping at three
different surge current levels
-
10, 50 and 250A, with 8x20
waves, 40V/small div, 5
us/small div
Metal Oxide Varistors
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Siliconavalanche
devices
symbol
Avalanche diode clampingperformance at two different
current levels. 20 and 140A, 10
x 1000 us impulses 1V/2ms
small div
Silicon Avalanche Diode Suppressor
Element
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Interpretation for IEEE Std 1050- 1996
The caution that "the use of one or more isolated ground rods
as the
signal reference ground is a safety hazard and is not recommended"
is not explicitly explained in IEEE Std 1050-1996 since it is well
covered in the IEEE Green Book (IEEE Std 142-1991) and the
IEEE Emerald Book (IEEE Std 1100-1996).The most basic safety hazard is that the isolated ground reference
does not have a direct connection back to the system source which
could prevent protective devices from operating because of the high
impedance that is introduced. Equipment damage from transients
such as lightning is also a real concern.
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Grounding Problems
Current Source Lightning
Average current 30,000 amps
Voltage Difference
Ground Resistance
Ohms Law Voltage = Current X Resistance
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Review Ohms Law
Voltage = Current X Resistance
(ohms)(Potential) (amps)
Develop VOLTAGE
DevelopVOLTAGE
BONDING
GroundRod
GroundRod
Current Source Lightning
Average current 30,000 amps
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CATV
Electric
Service
Entrance
TelevisionReceiver
Lightning
Voltage Difference Current
Difficult installation
scenarios
Troublesome electrical
condition
Typical electronic
equipment symptomsMultiple externalconnections or servicesto components of the
same system
Transient voltages andTransient voltages andcurrentscurrents
at data port
connections
Intermittent lock ups, surgedamage of exposed I/O circuitsor corrupted signals
The problem from two different servicesand service ground points
System Bonding
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Bonding and Grounding
Phone System
Cable System
LAN System
Control and Communication Transducers
Sensors
Internal Interface
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Communications
Fiber Optic
Optical Coupling
Last resort to float one end of the
grounding this is usually not as successful.
Radio communication
One power source for all systems.
CPEC
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Life cycle rating category C3
Impulses up to 20,000 per phase
Standard features include: Internaland external LEDs, Form C
contacts, & Audible Alarm
Choice of Options:
Disconnect
Transient counter Remote monitor panel
NEMA 3R, 4, or 4x enclosures
10 year parts warranty
PECPEC
Type IType I
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Liebert
AC Power Medium Exposure TVSS, on distribution
and sub-distribution panels, or any medium exposure
locations.
Fault Current Rating (AIC): 65 kAIC
Surge Current Ratings: 100kA, 160kA
Dimensions: 100kA - 6.0x4.0x3.0160kA - 8.0x6.0x4.0
50 EMI/RFI Attenuation: 40 dBStatus Indication: LED, Dry ContactsCertifications: UL 1449, CUL
Warranty: 5 Years Parts
100KA 160KA
PowerSure
Panel Medium ExposurePowerSure
Panel Medium Exposure
PEC Type CEC Type C -100/C00/C -15050
PEC Type C-50
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Fault Current Rating (AIC): 14 kAIC
Surge Current Ratings: 25kA, 50kA, 100kA
Dimensions: 4.72x4.72x2.36
50 EMI/RFI Attenuation: 40 dBStatus Indication:LED, Dry Contacts
Certifications: UL 1449, CUL
Warranty: 10 Years Parts
Liebert
AC Power Low Exposure TVSS, on sub-
distribution panels, branch panels, or equipment in lowexposure locations.
PowerSure
Panel Low ExposurePowerSure
Panel Low Exposure
PEC Type C 50
UL 1449 Suppressed Voltage Rating
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UL 1449 Suppressed Voltage Rating
(Standard Voltage Rating)
L-N
L-G
L-L N-G
120/208 400 400 700 400277/480
800
800
1500
800
240 700 800480
1500
1500
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Single Point Grounding of Systems
Visual check grounding system and system
bonding point Conduct risk evaluation (identify vulnerable
appliances, equipment, and telephone and
computer systems)
Surge protection of external services
Additional internal SPD at equipment
Conductor length short to SPD
Recommended practices
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