Early Streamer emission
ESE Lightning Protection
Tz 20, tz 40, tz 50, tz 63 , tz90
Radius 37 mtr, radius 79 mtr
Offerings Low Voltage Products Products Earthing & lightning protection OPR Early streamer emission
Early streamer emission
OPR early streamer emission (ESE) air terminals are especially effective for lightning protection of industrial sites, administrative or public buildings, monuments and open-air sites such as sports grounds.
During a storm, when propagation field conditions are favorable, an OPR ESE air terminal will generate an upward leader. This upward leader from the OPR tip propagates towards the downward leader from the cloud at an average speed of 1 m/µs.
This emission of an early streamer to a lightning event delivers a beneficial triggering time compared to a single rod air terminal exposed to the same conditions. The beneficial triggering time is determined as the average time gained at the moment of sparkover, with efficiency confirmed by high-voltage laboratory testing. All ESE tests are defined in Annex C of the French standard NF C 17-102 (2011 Version).
How to choose your OPR?
Calculating protected areas
OPR radius of protection
The radius of protection Rp of an OPR is given by French standard NF C 17-102 (September 2011 edition).
It depends on the ESEAT efficiency ∆T of the OPR measured in the high voltage laboratory, on the levels of protection I, II, III or IV calculated according to the lightning risk assessment guides or standards (NF C 17-102 annex A or IEC 62305-2, guides UTE C 17-100-2 or UTE C 17-108) and on the height h of the lightning air terminal over the area to be protected (minimum height = 2 m).
The protection radius is calculated according to Annex C in French standard NF C 17-102. For OPR 60, limiting the value of ∆T used in the protection radius calculations to 60 µs (limited 60 µs in accordance with the paragraph 5.2.2 of the NF C 17-102 standard).
opr-table-rolling-sphere-radius
Our offering
OPR 30 Lightning Arrester
OPR 45 Lightning Protection
OPR 60 Lightning Protection
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Keywords
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2011 Version
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ESE) air terminals
NF C 17-102 standard
French standard NF C
OPR ESE air terminal
September 2011 edition
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single rod air terminal
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ESE Lightning Protection
OPR 30 Lightning Arrester
beneficial triggering time
OPR early streamer emission
OPR 45 Lightning Protection
OPR 60 Lightning Protection
table-rolling-sphere-radius
propagation field conditions
protection radius calculations
Low Voltage Products Products
high-voltage laboratory testing
lightning risk assessment guides
