10 Safety instructions
Installation, start-up and maintenance safety
Obey these safety instructions which when you install, commission and do maintenance
on the megawatt station. If ignored, physical injury or death, or damage to the equipment
may occur.
Only authorized electricians can install, start-up and maintain the megawatt station. The
working methods, tools and components must obey the IEC regulations.
Always obey the local safety regulations concerning the electrical stations.
The megawatt station is a medium voltage (MV) device and, therefore, it can only be
energized and de-energized by an authorized person who has task-specific instructions for
the operation of an MV substation and permission from the on-site supervisor in charge of
electrical work.
If other people must be near the unit when the door is open, warn them, and give
supervision and guidance.
General safety
These instructions are for all personnel who install the megawatt station or do
maintenance work on it.
WARNING! Before you do any work, do these safety precaution steps.
1. Clearly identify the work area.
Read the safety instructions for the work area and the applicable equipment and
components. Refer to equipment-specific documentation.
2. Disconnect power sources and prevent connection.
Disconnect all possible power sources. Lock the disconnectors in the open position
and attach a warning notice to them. After power disconnection of the inverters,
always wait 10 minutes to let the intermediate circuit capacitors discharge.
3. Use protections against live parts.
4. Take special precautions when you do work near exposed conductors.
5. Measure to make sure that there is no voltage in the components.
6. Do the earthing (grounding) and short circuiting.
7. Make sure that you have a work permit.
Working areas
The megawatt station has several working areas based on the precautions needed for
safe working:
• Switchgear compartment
• Transformer compartment
• AC auxiliary panel compartment
• Inverter section
There are separate safety instructions for each of these working areas.
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