Presentation lightniing risk and protection guide line as per iec 62305
1. Protection of your Assests and Life Surrounding against Lightning Strike as
per IEC 62305
Safe Practice in Earthing and Protection
2. INDUSTRY EQUIPMENT ,SYSTEMS DESIGN AND Building .
POWER Power Generation, Transmission & Distribution ,Solar PV ,High Energy Storage Batteries
INFRASTRUCTURE & Buildings
Space Technology – Satellite Launch Pad
Architecture & Town Planning
Ports & Harbours
Roads, Highways, Bridges, Traffic & Transportation
OIL & GAS
Chemical & Process Plant
Refineries & Petrochemicals
Petroleum, Oil & Gas, LPG/LNG – Terminals / Depots / Retail Outlets / Bottling Plant.
Long distance Cross Country Pipelines – Oil & Gas
Iron & Steel
Coke Oven & Chemicals
Non-Ferrous Metals – Aluminium, Zinc, Copper, Lead, etc.
10. Earthing Design and Require Result
• For substation Large Power below 1.00Ohm
• For substation Small Power below 2.00Ohm
• SCADA/TELECOM and AutomationFor substation Large
Power below 0.50Ohm
• Tower and Other Structure between 8-15Ohm
• Lightning Surge Protection 50KA below 5Ohm or 100KA
• Follow Standard IEC /IEEE
• Recommended use of Hybrid Metal to Protect from Theft
Copper Clad Steel/Alumineum Clad Copper
• Exothermeic weld IEEE 837
18. Copper Cladded Conductor For Electrical
The Copper Clad Steel Grounding Conductor is made up of steel with the coating of 99.99% pure copper. These
or strands are equipped with the strength of steel with the conductivity and copper with the better corrosion
resistance property. The concentric copper cladding is metallurgic ally bonded to a steel core through a continuous,
solid cladding process using pressure rolling for primary bonding. The copper cladding
thickness remains constant surrounding steel. We use different steel grades for the steel core result in Dead Soft
Annealed, High strength and Extra High Strength Characteristics.
The Copper Clad Steel Wire yields a composite conductivity of 21%, 30% and 40% IACS, and available in Annealed
and Hard drawn. We are delivering products with varied conductivity and tensile strength as per the customer need.
Further, the wire can be processed to be silver plated or tinned copper clad steel wire.
20. What is Exothermic Welding System?
Copper to Bi-Metal and Alumenium
Types of Exothermic Joints:
Possible to join any bi metal except aluminum
Exothermic welding is a process of making maintain free highly molecular bonding process is superior in
performance connection to any known mechanical or compression-type surface-to-surface contact connector.
Exothermic weld connections provide current carrying (fusing) capacity equal to that of the conductor and will
not deteriorate with age.
It offers Electrical connections between two or more copper to copper and copper to steel conductors.
Highly portable method as it does not require any external power source or heat source, so it can be done
It provides strong permanent molecular bond among metallic conductors that cannot loosen and further will
not deteriorate with age.
Connection does not corrode with time and it offers permanent conductivity.
22. Facts about Lightning
• A strike can average 100 million volts of electricity
• Current of up to 200,000 amperes
• Can generate 54,000 oF
• 10/350MicroSec/50KA Fault Current/Discharge in
Earthing Design100KA Fault Current/Joints Exothermic
/Flexible Down Conductor with Shortest Route &
23. • Lightning Protection Standard use in India
(IS2309 Now IEC 62305-5)NBC2016
Working Principle Angullar No Compromise with Design
Max Protection 30Mtrs from One
No Product warrenty from Manufacturer
High Maintenance Require
NFC17-102(2011) Now Europeon Standard(ESE LA)
Working Principle Radius Compromise with Design
Possible with Increasing Qty of ESE
Max Protection 109 Mtrs Radius from One
Manufacturing Warrenty and Test Certificate for Products
Maintenance on Call Basis
24. Lightning Risk assessment Study is actually the measure of risk of a lightning strike and
probability of damages. As Per IEC62305-2.
All these calculations are based on:
lightning strike density in that particular area (provided by OMV i.e. Ng = 8),
Danger for people,
Occupation coefficient of structure,
Relative location of site,
Lightning Protection Level,
Surge Arrestor and
Dimensions of installation.
25. Lighting Strike Density (Ng)
It is the measure of lightning strikes per kilometre square per year in the particular area.
Higher the lighting strike density, higher the probability of lightning strike which needs higher level of lightning protection level.
Danger for People (h)
It is the factor of presence of people and panic in the building in case of a lightning strike
No particular danger 1
Low panic level(<=2 floors, < 100 persons 2
Medium risk of panic (< 1000 persons) 5
Difficult to evacuate (disabled people, hospitals) 5
High risk of panic (> 1000 persons) 10
Hazard for surroundings or environment 20
Contamination of surroundings or environment 50
Occupancy Coefficient (Lf1)
It is the risk reduction factor with respect to theoccupancy of the building / installation. For example, loss due to lighting strike is higher in hospital as compared to a store / warehouse.
Structure unoccupied 0.1
Structure normally occupied 0.01
Relative Location of Site (Cd)
It is the risk reduction factor with respect to the location and surrounding of the building / installation. For example, chance of lighting strike is minimized if the building is near to a high tower.
Structure surrounded by higher objects or trees 0.25
Structure surrounded by similar or lower objects 0.5
Isolated structure-No other objects nearby 1
Isolated structure on top of a hill or a hillock 2
Fire Risk (rf)
It is the risk reduction factor with respect to the flammability of the material present in the building / installation. For example, in case of lighting strike, loss will be very high at a gas station as compare to the cement store.
26. Lightning Risk Calcuator as per IEC6305
LIGHTNING RISK ASSESSMENT CALCULATIONS
Building / Installation : KTC Tower
Building ID No. KTC, Mall Road
LIGHTNING DENSITY Ng= 8
Length L(m) L= 12
Width W(m) W= 15
Height H(m) Hi= 10
Chimney/Tower height (m) T= 2
DANGER FOR PEOPLE h= No particular danger
OCCUPATION OF THE STRUCTURE Lf1= Structure normally occupied
LIGHTNING CONDUCTOR Pd= Protection Level IV
Electrical Line Ai= Underground
RELATIVE LOCATION OF THE STRUCTURE Cd= Structure surrounded by higher objects or trees
FIRE RISK rf= Low
SERVICE Lf2= Gas, water
SURGE ARRESTOR Pi= None
RESULTS OF THE RISK ASSESSMENT
Risk of human loss R1= ACCEPTABLE
Risk of loss of service R2= ACCEPTABLE
Risk of loss of cultural heritage R3= ACCEPTABLE
28. The Simple Rod air terminal is composed from a metallic rod with 2 to 8 m height dominating
the structure to protect, and linked to 2 down conductors minimum, and 2 earthing systems.
The protection radius ensured by this air terminal which is limited to 30 m more or less
(Protection level IV, height = 60 m), especially dedicated to the protection of small structures or
areas like to ers, hi eys, ta ks, ater to er, a te a asts… The EN 0 -3 standard
describes the installation procedure for these air terminals.
13 Simple Rods, 13 down conductors, and 13 earthing systems are necessary to ensure the
protection below :
29. The meshed cage protection is composed from a meshing in roof surface and in the front face around the
uildi g. Surrou di g the roof surfa e, a d o high poi ts, apture poi ts are positio ed. A o du tors’
network is placed at the outer perimeter of the roof. This network is completed by transverse conductors.
The size of the meshing is 5 to meters, and depends on the efficiency needed for the protection. On the
front face of the building, the down conductors are linked at the top to the meshing of the roof. And, down,
to specific earthing systems. The distance between two conductors is 10 to 25 meters, and depend on the
efficiency needed for the protection. The EN 62305-3 describes the installation procedure for this method.
Generally, this method is heavy and expensive, due to the complexity of the structures to protect.
26 capture points, 26 down conductors and a grounded loop earthing system are necessaries to ensure the
protection of the structure here below :
30. The catenary wires protection is a method closed to the meshed cage principle, because it is
constituted with meshing of the conductors far from the structure to protect, to avoid any
contact with lightning current.
Catenary wires are located over the structure to protect, connected to down conductors and
specific earthing systems. The width of the meshing and distance between the down conductors
must respect the same rules as for the meshed cage. The EN 62305-3 describes the installation
procedure for this method.
Generally, this method is heavy and expensive, due to the complexity of the structures to
31. The ESE air terminal is a terminal which enables to generate artificially an upward leader earlier than a
simple rod, with an ionization system, in order to establish a special impact on its point. The capture of the
lightning strike being faster than a simple rod, this technology enables to benefit from larger protection
areas, ensuring protection for large dimensions structures.
The ge erated prote tio radius depe ds o the early strea er e issio alue of the air ter i al Δt i µs ,
its height, and the efficiency of the protection. The protection radius ensured by this type of air terminal is
120 m (Protection level IV, height = 60 m , early streamer emission time 60µs) The NFC 17-102 standard
describes the installation procedure for this type of air terminal.
The installation of this type of air terminal is easy and cheaper than other technologies. It can protect whole
buildings with one E.S.E. air terminal. It enables the protection of a structure and its environment, the
protection of opened areas and well integrate in the architecture of a structure without aesthetic alteration.
1 ESE, 2 down conductors and 2 earthing systems are necessary to ensure the protection below :
ESE AT with radius protection form 32 mtr to 107 mtr.
DMC Insulator .
GI/FRP Mast .
Down Conductor Copper / Copper Cadmium
Cable 70 sq. mm
Copper Bonded Ground Earthing