1 Introduction
2 Procedure of exposure assessment
2.1 Exposure limits, reference values, action levels, action quotient
2.2 EMF-zones
EMF-zone | Action level (AL) or limit | AL 50 Hz E-field kV/m | AL 50 Hz B-field μT | Restricted access for: |
---|---|---|---|---|
0 | 1999 /519/EG OVE EN 50527-1 | 5 | 100 | Nobody |
A | Reference levels according to ICNIRP2010 | 5 | 200 | Pregnant workers, persons with AIMDa |
B | Action levels according to 2013/35/EU | 10/20 | 1000 | Pregnant workers, persons with AIMDa |
persons without instructionsb | ||||
Cs | Exposure limit sensory (ELV sensory) | Pregnant workers, persons with AIMDa | ||
persons without instructionsb | ||||
young workersc | ||||
Ch | Exposure limit health (ELV health) AUT decree: Only in specific cases if no reduction is possible | Pregnant workers, persons with AIMDa | ||
persons without instructionsb | ||||
young workersc | ||||
X | Exceeding exposure limits for employees | All persons |
2.3 Points of proof (PoPs)
2.4 Check radius, relevance distance and action distance
3 Testing the exposure to magnetic fields
4 Testing the exposure to electric fields
4.1 Parameters for electric field
- voltage level, for evaluation the maximum operation voltage (i.e. 123 kV, 245 kV, 420 kV) is used,
- geometry of non-insulated conductors,
- radius of the conductors,
- shielding cases,
- grounded surfaces in vicinity of the system.
4.2 Model for calculation of relevance distances and action distances
- 6 types of double system overhead lines (OHL) (380 kV, 220 kV, 110 kV, tower type “Donau” and “Tonne”)
- Horizontally arranged busbars and branches with different distances between the phases and a different number of systems
- six for the double system OHLs (for detail see [9]) the operating case with only one system in operation
- and two for the horizontal configurations;
- same order (L1 L2 L3 L1 L2 L3) or
- mirrored (L1 L2 L3 L3 L2 L1).
4.3 Substations
- phase to phase voltage: 245 kV
- distance between the live conductors: \(a_{1} =5~\text{m}\)
- height of the conductors above perfectly conducting ground: \(h_{\mathrm{L}} =8~\text{m}\)
- phase configuration L1 L2 L3, L1 L2 L3, as shown in Fig. 1
- rigid tubular conductor diameter: 250 mm
Parameter | \(h_{\mathrm{AQ}}\) | \(h_{\mathrm{AQ}}\) | \(D_{\mathrm{R}}\) | \(D_{\mathrm{A}}\) | \(D_{\mathrm{R}}\) | \(D_{\mathrm{A}}\) | \(D_{\mathrm{A}}\) |
---|---|---|---|---|---|---|---|
Zone 0 | Zone B high AL | Zone 0 | Zone 0 | Zone B low AL | Zone B low AL | Zone B high AL | |
– | 11.5 | 5.1 | 16.7 | 10.1 | 11.5 | 6.9 | 3.7 |
1 system | 10.9 | 5.0 | 15.3 | 9.7 | 11.0 | 6.7 | 3.6 |
2 systems mirrored | 12.2 | 6.1 | 15.4 | 10.2 | 11.0 | 7.1 | 4.5 |
3 systems | 11.6 | 5.1 | 17.0 | 10.2 | 11.7 | 7.0 | 3.7 |
3 systems mirrored | 12.5 | 6.2 | 15.1 | 10.5 | 10.8 | 7.3 | 4.5 |
Conductor pipe r = 80 mm | 10.9 | 4.8 | 15.7 | 9.4 | 10.7 | 6.4 | 3.3 |
Conductor rope 1 × r = 37 mm | 9.4 | 4.0 | 13.2 | 7.7 | 8.9 | 5.0 | 2.4 |
Conductor rope 2 × r = 37 mm | 10.1 | 4.4 | 14.4 | 8.5 | 9.8 | 5.7 | 2.9 |
Conductor rope 4 × r = 37 mm | 10.7 | 4.7 | 15.5 | 9.3 | 10.5 | 6.3 | 3.2 |
Distance conductors \(a_{1}= 4\) m | 10.9 | 4.9 | 15.8 | 9.7 | 11.0 | 6.7 | 3.6 |
Distance conductors \(a_{1}= 5.5\) m | 11.8 | 5.1 | 17.1 | 10.3 | 11.7 | 7.0 | 3.8 |
Distance conductors \(a_{1}= 8\) m | 12.8 | 5.4 | 18.8 | 11.2 | 12.5 | 7.5 | 4.0 |
Distance conductors \(a_{1}= 10\) m | 13.5 | 5.5 | 19.8 | 11.7 | 13.0 | 7.7 | 4.1 |
Height conductors \(h_{\mathrm{L}}= 6\) m | 11.5 | 5.1 | 16.7 | 10.1 | 10.5 | 6.5 | 3.6 |
Height conductors \(h_{\mathrm{L}}=12\) m | 11.5 | 5.1 | 16.7 | 10.1 | 13.1 | 7.5 | 3.8 |
3 Sys mirrored, \(a_{1}= 10\) m, \(h_{\mathrm{L}}= 12.5\) m | 17.0 | 5.9 | 21.6 | 15.0 | 15.0 | 9.8 | 5.3 |
4.4 Overhead lines OHL
- Type “Tonne” with dimensions \(x _{1}= 8.3\) m, \(x _{2}= 11.3\) m, \(x _{3}= 7.5\) m, \(h _{1}= 8\) m, \(h _{2}= 9.5\) m
- phase to phase voltage 420 kV
- height of the conductors \(h_{\mathrm{L}} =16 \text{ m}\)
- phase configuration No. 1 (symmetrical)
- Bundle of 3 conductors with diameter 36 mm each, distance 0.4 m.
Configuration | Zone 0 | Zone B, low AL | Zone B, high AL | |||
---|---|---|---|---|---|---|
g | e | g | e | g | e | |
Tonne, phase position 1; 2xbundle | 12.2 | 25.9 | 6.0 | 12.1 | 3.0 | 4.2 |
Tonne, phase position 1; 3xbundle | 13.9 | 27.9 | 6.7 | 14.2 | 3.4 | 5.0 |
Tonne, phase position 1; 4xbundle | 15.2 | 29.5 | 7.4 | 15.6 | 3.7 | 5.6 |
Tonne, phase position 3; 2xbundle | 10.2 | 16.1 | 5.8 | 8.1 | 2.9 | 3.7 |
Tonne, phase position 3; 3xbundle | 11.2 | 17.6 | 6.4 | 9.2 | 3.4 | 4.2 |
Tonne, phase position 3; 4xbundle | 11.9 | 18.8 | 6.9 | 9.9 | 3.7 | 4.7 |
Donau, phase position 1; 2xbundle | 9.6 | 16.7 | 5.1 | 7.3 | 2.8 | 3.3 |
Donau, phase position 1; 3xbundle | 11.0 | 18.5 | 5.7 | 8.4 | 3.1 | 3.8 |
Donau, phase position 1; 4xbundle | 12.0 | 19.9 | 6.2 | 9.4 | 3.4 | 4.2 |
Donau, phase position 3; 2xbundle | 8.5 | 11.9 | 5.1 | 6.3 | 2.8 | 3.2 |
Donau, phase position 3; 3xbundle | 9.3 | 13.2 | 5.6 | 7.1 | 3.1 | 3.6 |
Donau, phase position 3; 4xbundle | 9.9 | 14.2 | 6.1 | 7.8 | 3.4 | 4.0 |