First South East European Regional CIGRÉ Conference. Portoroz, Slovenia, 7 8 June 2016

Transcription

1 First South East European Regional CIGRÉ Conference Portoroz, Slovenia, 7 8 June 2016 Assessment of new OHL of Slovak Republic Transmission System with regard to the recommendation of the Directive No. 1999/519/EC 1-03 SAVČÁK Michal, SKURČÁK Luboš, BOJDA Peter, CHOVANEC Juraj

2 Content Recommendation of the Directive No. 1999/519/EC Model of line Reasults Measures to meet requirements Other activities in area of electromagnetic fields

3 Action value electromagnetic fields Recommendation of the Directive No. 1999/519/EC Ministry of Health Decree No. 534/2007 Col. Category of persons Industrial frequency f (Hz) Electric field strength E (kv/m) Magnetic induction B (μt) Public

4 Common parameters of assessment line types of towers with the height of phases above the ground and their position from the axis of the tower number of systems (single or double line) number of ground wires type of ground wires voltage level maximum operating current type of phase conductor number of conductors in bundle bundle step phase sequence

5 Parameters for the individual spans span length altitude of tower heel distance of the lower phase conductors from the ground at midspan terrain altitude in the mid-span the lowest vertical height of conductor from the ground (Hmin) terrain altitude in place with a minimum height of phase conductors from the ground distance of point with the minimum height of phase conductors from the ground from the axis of the tower within span terrain profile in the width of the line protective zone

6 E (kv/m) Data from the project of overhead lines Tower type and height Course of Electric field strenght in this span Tower type and height Conductor type Electric field strength E (kv/m) Minimum ground distance Terrain and tower heel altitude 2 1 Distance from tower Distance from tower number 24 (m) Span length

7 Data from the project overhead lines Course of Electric field strenght in this span Tower type and height Tower type and height Conductor type Minimum ground distance Terrain and tower heel altitude

8 Model of previous span in EFC400

9 Result of computing electric field strength in power lines (tower Cat head)

10 Result of computing magnetic field in power lines (tower DONAU)

11 Result of computing electric field strength in power lines (tower PORTAL-Y)

12 To decrease the E and B following measures are most frequently used in practice Optimization of phase sequence in the case of multiple system line. This measure is examined for all multiple system lines. Increase height of towers in the span thereby increasing height of conductor from the ground. Structural adjustment of tower head (compacting line).

13 Optimization of phase sequence in the case of multiple system line. This measure is examined for all multiple system lines L1_I L1_II L1_I L3_II L1_I L2_II L2_I L3_I L2_II L3_II L2_I L3_I L2_II L1_II L2_I L3_I L3_II L1_II Phase sequence 1 Phase sequence 2 Phase sequence 3 L1_I L3_II L1_I L2_II L1_I L1_II L2_I L2_II L3_I L1_II L2_I L3_I L1_II L3_II L3_I L2_I L2_II L3_II Phase sequence 4 Phase sequence 5 Phase sequence 6

14 Increase height of towers in the span thereby increasing height of conductor from the ground

15 Standard tower Experimental study of structural adjustment (compacting line). Compact tower Standard tower Compact tower Electric field strength decrease by 28

16 Electric Electric Electric field field field strenght strenght strenght (kv/m) (kv/m) Measurement of EMF on overhead lines Comparison of measurement and calculating 63,5 8 6 Longitudinal Lateral profile profile 2x400 of of kv 220 kv kv line kv line (Portal (Cat line (Donau (Cat head (Portal tower) head tower) tower) , , Measured Calculated 1 1 0, Distance between from from axis axis towers of of line line (m) (m)

17 Other activities in area of electromagnetic fields Computing magnetic field in power substation

18 Other activities in area of electromagnetic fields Computing electric field strength in power substation

19 Other activities in area of electromagnetic fields Protection of the Slovak population against the effects of electromagnetic fields

20 Thank you for your attention Ing. Juraj CHOVANEC, VUJE, Slovakia