protection against overvoltage due to lightning
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Protection againstovervoltage due to
lightning
PRES
AN
EEE
R
S%A&I 'I'E(ANANDA INSTIT)TE !* TEC
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IndeIntroduction
Lightning & Adverse Effect
Protective Devices-
a. Earth screenb. Overhead Ground wire
c. Lightning Arresterd. Recloser
• Rod ga/ A• Horn ga/ • Pellet t0/• E/ulArrester• 'alve T0/
Conclusion
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Introduction
There are several /ossi2ilities o3 overvoltage o3 e4uthat can 2e caused 20 internal and eternal !vervoltage due to lightning is 5ore a//rec5agnitude that 5a0 get the e4ui/5ents Thence3orth the ter5 8/rotection9 co5es an/rotective devices 5ust 2e installed to contideli2eration s0ste5.
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"ightning + Adverse E7ect
"ightning is nothing 2ut an electric discharge 2et
charge centers o3 sa5e cloud6 :hich contains an charges and creates a huge voltage that har53e4ui/5ents.
In the gra/hical re/resentation6
The :ave is characteri;ed 20-
Crest or /ea< value *ront ti5e Ti5e duration
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This stee/-3ronted :ave3or5 carries so5e adverse e7
• Travelling :ave :ill shatter the insulation
• Accu5ulation o3 charges + insulation 2rea< do:n
• !scillation o3 line
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Protective Devices
*ro5 the /revious e/lanation it is seen that the e7ect 5a0 2e 5ore ha;ardous6 disru/ts thedeli2eration /rocedure. So6 to /rotect these 3ro5 dso5e /rotective devices 5ust 2e installed. These are
Earth Screen?
Earth screen is 2asic and e/ensive e4ui/5/rotectors6 5ade 20 constructing a net:or< oconductors 5ounted all over the electrical e4ui/5en
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!verhead ,round %ire?
!verhead ground :ire is installed 3or /roviding/rotection on trans5issional ele5ents and set u/a2ove the line :ires at an eact /osition :here astro
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Recloser?
That is used to detect a 3aulton line and disconnect thesection and auto5aticall0 tr0to reconnect a3ter an interval.
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"ightning Arrester?
In /revious e/lanation6 earthscreen and ground :ire can:ell /rotect the overvoltage 2utnot travelling :ave that is
o2structed 20 using lightningarresters.
In addition it is a2le to divert thehigh voltage surge to:ardsground.
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i. Rod ga/ Arrester?
ii. Horn t0/e Arrester?
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iii. Pellet t0/e Arrester ?
This t0/e o3 arrester5ade 20 lead /eroidecoated 20 lead oide.
"ead oide is not strongconductive 6lead/eroide is.
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Co5/ound sheath non-
clearance arrester
Earl0 strea5er e5
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Conclusion
*ro5 the earlier discussion6 :e can conclud/rotection 5ust 2e needed 3or :el3are o3 /o:er s0sto /rovide endless deli2eration s0ste5. So6 these /devices should 2e /er3ect and 5ore ecient. Th5odern technolog0 is 2eing used to cut do:n vo5ai5u5 as /ossi2le.
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THAN( Y!)
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