Lightning Free
MAKE IN INDIA
Lightning Protection as Per IEC 62305
July 2017
External/Internal Surge Source
An Arcing Fault is the flow of current through the air between phase conductors or phase conductors and neutral or ground. Concentrated radiant energy is released at the point of arcing an a small amount of time resulting in Extremely High Temperature.
Fire Accident Reason Lose Contact Earthing Disorder and Lightning
Surge in Systems and Result
Surge Protection use Recommendation
JMV LPS Products
Copper Cladded Conductor For Electrical Installation
The Copper Clad Steel Grounding Conductor is made up of steel with the coating of 99.99% pure copper. These conductors/ wires 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.
Most Efficient JointProcess
It is efficient and superior to all existing surface –to-surface mechanical retention connectors.
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 almost anywhere. 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.
Copper Clad Steel Solid ROD and Conductor
LIGHTNING FORMATION
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 Nano Sec Protection Earthing Design100KA Fault Current/Joints Exothermic /Flexible Down Conductor with Shortest Route & Less Corner
• 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 Earthing below 10.00 Ohm
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, Fire Risk, Associated services, Electrical Lines, Lightning Protection Level, Surge Arrestor and Dimensions of installation.
Lightning Safety Calculation 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.
Explosion
1
High
0.1
Ordinary
0.01
Low
0.001
Lightning Risk Calcuator as per IEC6305 LIGHTNING RISK ASSESSMENT CALCULATIONS Building / Installation :
KTC Tower
Building ID No.
KTC, Mall Road
Ng=
8
Length L(m)
L=
12
Width W(m)
W=
15
Height H(m)
Hi=
10
Chimney/Tower height (m)
T=
2
LIGHTNING DENSITY
STRUCTURE
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
Risk of human loss
R1=
ACCEPTABLE
Risk of loss of service
R2=
ACCEPTABLE
Risk of loss of cultural heritage
R3=
ACCEPTABLE
RESULTS OF THE RISK ASSESSMENT
PASSIVE PROTECTION SYSTEM
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 towers, hi eys, ta ks, water tower, a te a astsâ&#x20AC;Ś 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 :
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 torsâ&#x20AC;&#x2122; 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 :
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 protect.
JMVâ&#x20AC;&#x2122;s Clients
Neeraj Saini â&#x20AC;&#x201C; 9910398538 Manav Chandra - 9910398999 manav@jmv.co.in