02-07-2012, 03:56 PM
Electrical Preventive Maintenance
Preventive Maintenance.pptx (Size: 95.18 KB / Downloads: 114)
CRITICAL!!!!
1) No guarantees, reduce your probability of an electrical
crisis or outage.
2) Does it cost you or your company money or
is it just inconvenient.
3) Time period for evaluation, typically one hour.
4) How is the electrical distribution system designed.
High Voltage verses Low Voltage
1) Different types of testing, contact verses non-contact.
2) Energized cleaning tightening.
3) Critical verses Non-Critical
4) Typically different types of deficiencies.
Typical Low Voltage Deficiencies
1) Overloading
2) Code violations
3) Loose connections
4) Trash, contamination or storage
5) Harmonics
Typical High Voltage Deficiencies
1) Corona or tracking
2) Stress cone failure
3) Loose connections
4) Dirt or contamination
Harmonics
1) Caused by the switching or disruption of the
normal 60 cycle sine wave.
2) Tripling harmonics 3rd, 9th or 15th.
3) Motor rotation.
4) Annoying verses destructive harmonics.
Infrared Analysis
1) Imaging verses scanning.
2) Measures infrared wave emissions not temperature.
3) Emissivity
4) Is not a cure-all, do not use a screwdriver when
you need a hammer.
5) High voltage verses low voltage.