electrical Preventive Maintenance

Electrical Preventive Maintenance

What is the definition of Electrical Preventive Maintenance?


What is the definition of Electrical Preventive Maintenance?

The scheduled inspection, testing and maintenance

of critical electrical components!


Scheduled!!!

1) Start with a plan

2) Depending on the type of maintenance and the environment the frequency can vary from one to five years.

3) Be Proactive verses Reactive.


Inspection, Testing & Maintenance

1) IEEE-- The Institute of Electrical and ElectronicEngineers.

2) NETA --National Electrical Testing Association.

3) Good common sense.


CRITICAL!!!!

1) No guarantees, reduce your probability of an electricalcrisis 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

Low Voltage- 120 to 600 volt equipment

High Voltage - over 600 volt equipment


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 whenyou need a hammer.

5) High voltage verses low voltage.


Ultrasound Leak Detection1) Microphone

2) High voltage

3) Pole leads

4) Steam traps

5) Motor bearings


Transformer Oil Testing1) Dissolved Gas Analysis

2) Oil Quality Profile

3) PCB Analysis

4) SD Meyers

5) Taking samples

6) Frequency


Polarization Index Testing

1) Megger Test

2) Capacitance Test

3) Frequency

electrical Preventive Maintenance

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