Application Notes; Preventive Maintenance - AVO MEGGER BM25 Guide De L'utilisateur

Preventive Maintenance

The proverb 'A stitch in time saves nine' inspired the title of an
AVO International 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 quality 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. AVO supplies test record cards to assist with
such record keeping, and now with the BM25, 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
BM25 to make better use of your time and information. To help
you get the most from your BM25 we have included two short
sections; firstly covering Insulation Testing Concepts, then
looking at the application of the different test techniques.

Application Notes

Equipment................................
Location ...................................
AVO INTERNATIONAL
Insulation Test Record
N ................. Rating..............
o.
Date installed ........................
Test Record Example
17