Catalogue - PREVECTRON BROCHURE - Indelec - (Version JPG)

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Isolating spark gap, Beacon light, Counter, Lightning protection, Surge arrester

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Early Streamer Emission Lightning Conductors

Protection area

The protection area Rp of a PREVECTRON®2 lightning conductor is calculated according to French Standard NF C 17-102, thus: R_p = Vh (2D-h) + AL (2D + AL)

The protection area depends on a number of factors:

• Gain in triggering time AT of the chosen PREVECTRON®2 (see Technical Guide: high-voltage laboratory PREVECTRON® test results), which allows the AL value to be determined according to the formula AL (m) = V(m/_s) .AT(_s);

• D = 20, 45, or 60, depending on the protection level required (I, II, or III) on a given site, according to the lightning risk assessment guide (NFC 17-102 appendix B);

• the actual height of the lightning air terminal above the surface to be protected: h (where h < 5m, see table below).

Calculating the protection area using Indelec's Proteo 2001

software

Protection Radii


h (m)	2	3	4	5	10
S 6.60	31	47	63	79	79
S 4.50	27	41	55	68	69
S 3.40	23	35	46	58	59
TS 3.40	23	35	46	58	59
TS 2.25	17	25	34	42	44
h (m)	2	3	4	5	10
S 6.60	39	58	78	97	99
S 4.50	34	52	69	86	88
S 3.40	30	45	60	75	77
TS 3.40	30	45	60	75	77
TS 2.25	23	34	46	57	61
h (m)	2	3	4	5	10
S 6.60	43	64	85	107	109
S 4.50	38	57	76	95	98
S 3.40	33	50	67	84	87
TS 3.40	33	50	67	84	87
TS 2.25	26	39	52	65	69

Level I : D = 20m

high protection

Level II : D = 45m

medium protection

Level III : D = 60m

standard protection

PREVECTRON BROCHURE - Indelec - #5

Isolating spark gap, Beacon light, Counter, Lightning protection, Surge arrester