Evaluating exposure from electric fields in a high voltage switchyard according to the EU directive

Area of Science:

• Electrical Engineering
• Occupational Health and Safety

Background:

• Assessments of worker exposure to electric fields in 400 kV switchyards are crucial for safety.
• Previous assessments indicated potential exposure above high action levels.

Purpose of the Study:

• To simulate and assess electric field exposure in 400 kV switchyards according to Directive 2013/35/EU.
• To determine compliance with exposure limit values (ELVs) under various conditions.

Main Methods:

• Performed simulations of electric fields induced in the human body.
• Analyzed exposure compliance based on grounding and contact with metallic objects.

Main Results:

• Worker exposure is compliant with the directive when not grounded or touching grounded objects.
• Exposure limit values (ELVs) are exceeded when touching grounded metallic objects with hand or foot.
• Exceedance of ELVs occurs at very low contact currents (2-3 μA) in the finger.

Conclusions:

• Worker safety in 400 kV switchyards depends on avoiding contact with grounded objects.
• Implementing appropriate safety measures is essential to prevent exceeding ELVs and to ensure continued work activities.