Wir schaffen Wissen – heute für morgen

Paul Scherrer Institut

4.2.2010

René Künzi

Safety for equipment & personnel

Electrical Equipment at PSI

X

Plant

Device

(PS)

50kV/16kV 16kV/400V Dist.

UV

Local Power Distribution Electrical Installation PSI Plants

Devices

Experiments

Personnel Safety in General (1)

Personnel Safety in General (1)

No contact lenses

Personnel Safety (Cloths 1)

• Working outside of danger area

– No special requirements, but….

– Long pants

– Closed shoes

Personnel Safety (Cloths 2)

• Working inside of danger area (protection through cover)

– Working cloths Safety class EN 61482-1-2 (ENV 50354) class 1

– Closed shoes

– Leather Gloves (recommended)

– Never work alone!

Personnel Safety (Cloths 3)

• Working inside of danger area (protection through distance, LV Fuse ≤ 200A)

– Working cloths Safety class EN 61482-1-2 (ENV 50354) class 1

– Closed shoes

– Leather Gloves

– Helmet with face shield (case by case)

– Never work alone!

Personnel Safety (Cloths 4)

• Working inside of danger area (protection through distance, LV, Fuse ≥ 200A, MV, HV)

– Working cloths Safety class EN 61482-1-2 (ENV 50354) class 1

– Closed shoes

– Safety Gloves

– Helmet with face shield

– Safety coat EN 61482-1-2 (ENV 50354)

– Never work alone!

Overheating protection (1)

• Water cooling is monitored twice– Detection of low water flow in

outlet– Temperature sensor on

heatsink

• Forced Air cooling needs to be monitored– High failure rate of fans– Direct monitoring with switch in the

airflow– Indirect monitoring with temperature

sensors on heatsink

Overheating protection (2)

• Magnetic Devices (chokes, transformers)

Conservative design withmoderate winding temperatures

Fans must be monitored

Protection against accidental contact (1)

All Power Supply racks are locked!

All hot blank parts must be covered

Protection against accidental contact (2)

Protection against accidental contact (3)

• Door Switches– … are usually no safety elements– … unless certified and directly switching (not via PLC)