Atec Megger-frax150 - Manual

FRAX 150
Sweep Frequency Response Analyzer
n Highest dynamic range and accuracy
in the industry
n Built-in PC with powerful backlit screen
for use in direct sunlight
n Highest possible repeatability by
using reliable cable practice and
high-performance instrumentation
n Fulfills all international standards
for SFRA measurements
n Advanced analysis and decision support
built into the software
n Imports data from other FRA test sets
FRAX 150
Sweep Frequency Response Analyzer
DESCRIPTION
Power transformers are some of the most vital components
in today’s transmission and distribution infrastructure.
Transformer failures cost enormous amounts of money
in unexpected outages and unscheduled maintenance. It
is important to avoid these failures and make testing and
diagnostics reliable and efficient.
The FRAX 150 Sweep Frequency Response Analyzer
(SFRA) detects potential mechanical and electrical
problems that other methods are unable to detect. Major
utilities and service companies have used the FRA method
for more than a decade. The measurement is easy to
perform and will capture a unique “fingerprint” of the
transformer. The measurement is compared to a reference
“fingerprint” and gives a direct answer if the mechanical
parts of the transformer are unchanged or not. Deviations
indicate geometrical and/or electrical changes within the
transformer.
FRAX 150 detects problems such as:
n
Winding deformations and displacements
n
Shorted turns and open windings
n Loosened clamping structures
n
Broken clamping structures
n Core connection problems
n
Partial winding collapse
n Faulty core grounds
n
Core movements
APPLICATION
Power transformers are specified to withstand mechanical
forces from both transportation and in-service events, such
as faults and lightning. However, mechanical forces may
exceed specified limits during severe incidents or when
the insulation’s mechanical strength has weakened due to
aging. A relatively quick test where the fingerprint response
is compared to a post event response allows for a reliable
decision on whether the transformer safely can be put back
into service or if further diagnostics is required.
Collecting fingerprint data using Frequency Response Analysis (FRA) is an
easy way to detect electro-mechanical problems in power transformers
and an investment that will save time and money.