Electromagnetic Radiation Level for 132kV line

Electromagnetic Radiation Detector 

To misure eletric field at your home.

 

Power lines: specific voltages

Whole list all possible overhead voltages

 

132 kV overhead lines: magnetic fields

132 kV overhead lines are usually carried on lattice steel pylons, but smaller than used for 275 kV and 400 kV lines.  Sometimes they are carried on wood poles.

The maximum field is produced by the largest design of line – the L7 – when the ground clearance is the minimum allowed – 7.0 m – and the loads are the highest allowed – 1.4 kA in each circuit.  The field also depends on the phasing. 132 kV lines usually have Untransposed (U) phasing.

Typical fields are lower than the maximum field because the clearance is usually higher and the loads are usually lower.  The three curves shown here are for typical loads, the normal U phasing, and three different line designs: L7 (the highest), a smaller pylon design, the L132, and a wood-pole design (the lowest field).

 

Magnetic field in µT at distance from centreline

Type of lines				maximum under line	10 m	25 m	50 m	100 m
largest lines L7 twin bundles	0.305 m lynx	maximum	clearance 7 m phasing U load 1.4/1.4 kA	30.445	20.532	5.553	1.528	0.392
		typical	clearance 10 m phasing U load 0.13/0.13	1.848	1.359	0.468	0.138	0.036
smaller lines L132	single conductors 0.4 sq in	maximum	clearance 7 m phasing U load 1.2/1.2 kA	24.585	17.217	4.587	1.247	0.318
		typical	clearance 10 m phasing U load 0.13/0.13 kA	1.731	1.317	0.451	0.132	0.034
smallest wood-pole design trident 150 m span	single conductors lynx	maximum	clearance 7 m single circuit load 0.7 kA	12.347	3.633	0.738	0.192	0.048
		typical	clearance 10 m single circuit load 0.1 kA	1.764	0.385	0.099	0.027	0.007

 

 

132 kV overhead lines: electric fields

132 kV overhead lines are usually carried on lattice steel pylons, but smaller than used for 275 kV and 400 kV lines.  Sometimes they are carried on wood poles.

The maximum field is produced by the largest design of line – the L7 – when the ground clearance is the minimum allowed – 7.0 m.  The field also depends on the phasing. 132 kV lines usually have Untransposed (U) phasing.

Typical fields are lower than the maximum field because the clearance is usually higher.  The three curves shown here are for the normal U phasing, and three different line designs: L7 (the highest), a smaller pylon design, the L132, and a wood-pole design (the lowest field).

 

Electric field values are misured in Volt / meter at distance from centreline

Type of lines				maximum under line	10 m	25 m	50 m	100 m
largest lines L7 twin bundles	0.305 m lynx	maximum	clearance 7 m phasing U	3615	913	182	81	23
		typical	clearance 10 m phasing U	2372	890	103	72	23
smaller lines L132	single conductors 0.4 sq in	maximum	clearance 7 m phasing U	2628	697	154	66	19
		typical	clearance 10 m phasing U	1780	689	86	59	18
smallest wood-pole design trident 150 m span	single conductors lynx	maximum	clearance 7 m single circuit	1174	588	73	11	2
		typical	clearance 10 m single circuit	583	458	89	15	3

 

Summaries of fields from all power lines

 

Exposure limits in Italy

The national Italian EMF limits currently in force were set by Decree of the Prime Minister in August 2003, replacing a previous decree of 1992.

For the general public, the limits are:

• Electric fields: 5 kV/m
• Magnetic fields: 100 µT

In addition, for magnetic fields, and applying to overhead power lines only, there are two further values:

• The attention value: 10 µT. Applies where exposure is for more than 4 hours per day.
• The quality target: 3 µT. Applies to new lines and to new homes only.

(both these values are limits on the daily averages, values at times during the day can be higher)

Three Italian Regions – Veneto, Emilia-Romagna and Toscana – set exposure limits in 1999 and 2000 for power lines at 0.2 µT for new installations near nurseries, schools, hospitals, houses and places where people spend more than four hours per day. Veneto also has a similar limit of 0.5 kV/m. These regional laws remain in force, but the national Decree prevents any other Regions doing likewise.

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