SFRA Sweep Frequency Response Analysis IEC60076-18 - METHODS-

SFRA Sweep Frequency Response Analysis

Method for evaluating the mechanical integrity of core, windings and clamping structures within power transformers. Its basis is the measurement of the transformers’ electrical transfer functions over a wide frequency range. The goal of SFRA is to test if physical displacements in the active part of the transformer have occurred due to aging or after a particular event such as short circuit fault and transportation. The test results are compared with the reference so that a wide range of fault types can be detected, including:

• Core movements• Faulty core grounds• Winding deformations• Winding displacements• Partial winding collapse• Hoop buckling• Broken clamping structures• Shorted turns and open windings• Etc.

IEC 60076-18
The specific requirements for the construction, testing and marking of electrical equipment, parts of electrical equipment and Ex components with the type of protection encapsulation "m" intended for use in explosive gas atmospheres or explosive dust atmospheres.

Methods

1- Time-based (current SFRA results will be compared to previous results of the same unit)

2- Construction-based (SFRA of one transformer will be compared to another of the same design)

3- Phase-based (SFRA results of one phase will be compared to the other traces of the same unit)

Tests

• Measure the three phase responses from HV side with LV side short-circuited
• Measure the three phase responses from HV side with LV side open-circuited
• Measure the three phase responses from LV side with HV side open-circuited
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