Atec Tettex-FRA5310 - Manual

Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice. LL_FRA5310_0711_RF – 1/3
a brand of
Haefely is a subsidiary
of Hubbell Incorporated.
FRA 5310
Sweep Frequency Response Analyser for Power Transformer Diagnosis
The FRA 5310 Sweep Frequency Response Analyser
detects transformer winding movements and
mechanical failures due to mechanical shock,
transportation or short circuits.
APPLICATION
Many dielectric and mechanical failures in large power
transformers are preceded by mechanical changes in the
winding structure. These changes, or displacements in the
winding, may be the result of:
 Transportation damage occurring between the
manufacturer and the final location
 Short circuit forces imposed on the windings
resulting from a low impedance fault occurring close to
the transformer
 Natural effects of aging on the insulating
structures used to support the windings
Detection of these displacements ahead of a dielectric
failure can reduce unplanned maintenance costs, and
provide the possibility to improve system reliability by
preventing outages. Additionally, when damage is
discovered, repairs may be targeted to a specific phase
winding.
METHOD
The corresponding HF circuit of a transformer winding is a
complex R-L-C-network. The measured frequency response
(transfer function) of this network is unique like a fingerprint.
Changes in the winding geometry will be reflected by
deviations between repeated measurements. Even small
winding movements or distortions will cause legible changes
in the measured transfer function, which is clearly detectable.
Deviations can be caused by short-circuited turns, open
windings, mechanical damage to windings or core, loose
turns, faulty clamps, etc.
DESIGN
The FRA 5310 software and the large touch-screen interface
guarantee a very easy-to-use instrument. Load
measurements, set configurations, obtain connecting
information, repeat previous measurements and do
comparisons just on a fingertip. Integrated analysis tools,
reporting capability and additional PC software complete this
advanced Sweep Frequency Response Analyser.
FEATURES AND BENEFITS
 High measurement reliability and reproducibility
due to active probes design and a clear defined
connection and grounding technique
 High signal-to-noise ratio due to output voltage up to
12 Vpeak-peak at 50  (24 Vpeak-peak at 1 M)
 Automatic Interpretation according to Chinese
Standard DL / T 911 - 2004
 Ease of use due to automated Windows test software
and large color touch screen interface and remote start
button
 Rugged, lightweight and small all-in-one field design
 Measuring modes (amplitude & phase):
 Transfer Voltage Function U1/U2 (f)
 Impedance Function U1/I2 (f)