Standards – Sur e Protection St an d ar d IEC 62305-1 IEC 62305-4 IEC 61643-1 IEC 61643-12 IEC 61643-22 IEEE C62.41.2 UL 1449 AS/NZS 1768
T i tl e Protection Against Lightning - Part 1: 1: General Principl es Protection Against Lightnin g - Part 4: Electrical Electrical and Electronic Systems Systems wi thin Structures Low-Voltage SPDs - Part 1: SPDs Connected to Low-Voltage Power Distribution Systems - Requirements and Tests Low-Voltage SPDs - Part 12: SPDs Connected to Low-Voltage Power Distribution Systems - Selection and Application Principles Low-Voltage SPDs SPDs - Part Part 22: 22: SPDs SPDs Connected Connected to Telecom municati ons and Signal li ng Networks - Selection and Appli cation Prin ciples Recommended Practice on Characterization of Surges in Low-Voltage (1000 V and Less) AC Power Circuits Transient Voltage Surge Suppressors Lightni ng Protection [and Surge Protection] Protection]
Consequences of unprotected
Consequences of unprotected
Insulation failure due to overvoltage surge
Why are SURGES a
Increased equipment
Expense of lost time Liti ation and insurance expense
Surge Protection
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Surge Protection
ow surges enter facilities – Earth Potential
Surge Protection
Typical Surge Waveforms
SPD Definition
Device that is intended to: - limit transient overvoltages, and - divert surge currents. It contains at least one non-linear component. [definition 3.1 of IEC 61643-1]
Also:
Transient Voltage Surge Suppressor urge rres er Surge Protector
SPD Components – “Voltage Limiting” “ ”
SPD Components – voltage limiting
commonly Varistors MOVs
SPD Components – voltage limiting
Devices Zener diodes, ormu e o handle surge “Transorbs” Also, thyristors
SPD Components – voltage switching
Discharge Tubes (GDTs) Inert gas between two e ec ro es
SPD Components – voltage switching
formed closely spaced electrodes
SPD Components – characteristics
(Can combi ne for t he best of each)
SPD Components – characteristics
SPD Components – characteristics
SPD Responses
RESPONSE OF VOLTAGE LIMITING TYPE OF SPD
SPD Responses
RESPONSE OF VOLTAGE SWITCHING TYPE OF SPD
SPD Responses
RESPONSE OF ONE-PORT COMBINATION TYPE OF SPD
SPD Responses
RESPONSE OF TWO-PORT COMBINATION TYPE OF SPD
SPD Responses
RESPONSE OF TWO-PORT VOLTAGE LIMITING TYPE OF SPD WITH FILTERING
SPD Configuration – one port
Common input/output
Separate input/output
SHUNT (ONE-PORT) PROTECTORS
SPD Configuration – two port
Surge Filter
Signal Line SPD
SERIES (TWO-PORT) PROTECTORS
SPD Configuration - MSPD
-
Protection modes
Common Mode
Differential Mode
A
Power Line
5. Protect incoming AC power feeders
SURGE AND TRANSIENT
A Surge Protector needs: • A good Surge Rating (8/20us). • Handles Lightning surges •
• A low Let-through voltage. •
.
• To be able to handle Temporary • So it behave safely during high AC over voltages
Sur e Current Ratin s at urge need?
urrent
e ’s oo a w a tell us
at ng o e s an ar s
Sur e Current Ratin s
Sur e Current Ratin s
Partial Direct Lightning Currents (Outgoing surges)
