True Power ATS ESE Lightning Arrester ATS 30 45 60 – India

ESE Lightning Arresters

ATS 30 / ATS 45 / ATS 60. Early Streamer Emission. NF C 17-102.

During a storm, when propagation field conditions are favourable, an ATS (True Power) ESE air terminal generates an upward leader. This upward leader from the air terminal tip propagates towards the downward leader from the cloud at an average speed of 1–2 m/µs.

This emission of an early streamer delivers a beneficial triggering time compared to a single-rod air terminal under the same conditions. Efficiency is confirmed by high-voltage laboratory testing. All ESE tests are defined in Annex C of French standard NF C 17-102 (2011).

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Radius of Protection Rp (m)

True Power ATS ESE air terminals — models ATS 30, ATS 45 and ATS 60. Rp depends on ESEAT efficiency ΔT, protection level I–IV and height h of the air terminal over the area to be protected (minimum height = 2 m).

Level of protection	(r = 20 m)			(r = 30 m)			(r = 45 m)			(r = 60 m)
	ATS 30	ATS 45	ATS 60	ATS 30	ATS 45	ATS 60	ATS 30	ATS 45	ATS 60	ATS 30	ATS 45	ATS 60
h (m).	Radius of protec on Rp (m)
2	19	25	31	22	28	35	25	32	39	28	36	43
3	29	38	47	33	42	52	38	48	58	43	57	64
4	38	51	63	44	57	69	51	65	78	57	72	85
5	48	63	79	55	71	86	63	81	97	71	89	107
6	48	63	79	55	71	87	64	81	97	72	90	107
8	49	64	79	56	72	87	65	82	98	73	91	108
10	49	64	79	57	72	88	66	83	99	75	92	109
15	50	65	80	58	73	89	69	85	101	78	95	111
20	50	65	80	59	74	89	71	86	102	81	97	113
45	43	65	76	58	75	89	75	90	105	89	104	119
50	40	65	74	57	75	88	75	90	105	89	104	120
55	36	65	72	55	75	86	74	90	105	90	105	120
65	30	65	69	52	75	85	73	90	104	90	105	120

During a storm, when propaga on field condi ons are favorable, an ATS (Truepower )ESE air terminal will generate upward leader. This upward leader from the airterminal p propagates towards the downward leader from the cloud at an average speed of 1-2 m/µs.

This emission of an early streamer to a lightning event delivers a beneficial triggering me compared to a single rod air terminal exposed to the same condi ons. The beneficial triggering me is determined as the average me gained at the moment of sparkover, with efficiency confirmed by high-voltage laboratory tes ng from interna onal acclaimed lab. All ESE tests are defined in Annex C of the French standard NF C 17-102 (2011 Version)

The radius of protec on Rp of an ATS is given by French standard NF C 17-102 (September 2011 edi on).

It depends on the ESEAT efficiency ∆T of the ATS measured in the high voltage laboratory, on the levels of protec on I, II, III or IV calculated according to the lightning risk assessment guides or standards (NF C 17-102 annex A and on the height h of the lightning air terminal over the area to be protected (minimum height = 2 m)

The protec on radius is calculated according to Annex C in French standard NF C 17-102. For ATS -3 limi ng the value of ∆T used in the protec on radius calcula ons to 60 µs (limited 60 µs in accordance with the paragraph 5.2.2 of the NF C 17-102 standard).

Protection Calculation

The protec on radius of Protector is calculated by the standard formula given in the French Standard NFC 17-102(Sept. 2011). The formula on is based on the lightning conductor triggering advance (ΔT), Installa on height (h) and the triggering distance (ΔL).

Rp(h) = √[2rh − h² + Δ(2r + Δ)] for h ≥ 5 m

And

Rp = h × Rp5 / 5 for 2 ≤ h < 5 m

Where h = ESE height relative to the area being protected (m)

Rp5 = value of Rp from the first equation when h = 5 m

r = 20 m for protection level I (Very High Protection)

r = 30 m for protection level II (High Protection)

r = 45 m for protection level III (Medium Protection)

r = 60 m for protection level IV (Standard Protection)