Features and Benefits

Swept frequency response analysis simply injects a series of frequencies into the windings of a power transformer. When a power transformer is correctly constructed without defects and faults, the frequency response (gain versus frequency) plot for that particular type of transformer and the windings on that particular transformer should exhibit a specific shape, and this "shape" then becomes the transformer's "fingerprint".

During the service life of the transformer, this "fingerprint" can be used to detect degradation of the transformer.

When is SFRA performed?

There are mainly three occasions for performing SFRA on power transformers

1. Factory quality inspection   2. Pre-short-circuit test
3. Before and after transportation              4. Ongoing periodic maintenance

SFRA45 options, software and accessories

Communication interfaces:

• Standard: RS232, LAN, USB

SFRA45 accessories:

• SFRA connection clip kit (standard)

• SFRA 18m N4L cable reel (standard)

• SFRA earth braid (standard)

• SFRA ground clamp kit (standard)

• USB flash drive for data storage (standard)

• BNC – BNC connection cable + BNC T-piece (standard)

• SFRA45 flight case (standard)

• Battery charger (standard)

• Vehicle battery charger lead (standard)

• SFRAComm analysis software (standard)

• Custom cable reel lengths up to 50m (optional)

Compliant with SFRA standards

• Compliant with IEC60076-18 – Sweep Frequency Response Analysis of power transformers (see application note:App_note)

Port accessory options:

• USB to 9-pin RS232 serial converter

Carrying case:

• SFRA hard flight case – SFRA45 hard carrying case, ideal for aircraft cargo hold storage (standard)

Calibration and documentation:

• Standard recalibration – SFRA45

• Spare user manual – hard copy of user and communication manuals

PC software (free):

• SFRAComm – SFRA PC interface software, database, graphics, real-time data display