Application Notes; Preventive Maintenance - Megger S1-5005 Guia Del Usuario

Application Notes

Preventive Maintenance

The proverb 'A stitch in time saves nine' inspired the title of an
Megger Limited booklet on insulation testing, as it neatly sums
up the benefits of preventative maintenance. The savings come
in financial terms from costly repairs, lost production, lost profits
and in human terms, from lives saved in the event of
dangerous electrical faults.
Regular insulation testing of electrical equipment can help to
detect deteriorating insulation. The effects which cause
insulation to deteriorate include mechanical damage, vibration,
excessive heat or cold, dirt, oil, moisture and localized voltage
stresses - all of which can arise on most industrial or utility
equipment.
Insulation tests are sometimes used in isolation as absolute
measures of the q u a l i t y of the insulation. This is most
appropriate when equipment is being installed and checked for
compliance with a specified 'Pass' level. For operational
equipment the key factors are trends in the insulation readings.
It is therefore important that records of insulation readings are
kept, relating to each piece of equipment or 'Asset' in your
testing regime. Megger supplies test record cards to assist with
such record keeping, and now with the S 1 - 5 0 0 5, the results can
be downloaded directly to a computer.
There are also a number of influences on the insulation readings
- temperature, humidity and surface leakage for example and a
range of test techniques have been developed to help with the
interpretation of your insulation tests.
A number of these techniques have been automated on the
S 1 - 5 0 0 5 to make better use of your time and information. To
help you get the most from your S 1 - 5 0 0 5 we have included two
short sections; firstly covering Insulation Testing Concepts, then
Test Record Example
looking at the application of the different test techniques.
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