Dielectric tests with impulse voltage are done to confirm the quality of insulation for HV equipment and are mandatory as per international standards. A defined impulse wave shape is applied to the test object and changes in the wave shape caused by the test object are used for detection of insulation faults. Determining these changed parameters exactly makes it absolutely necessary to have a fast and accurate measuring system. This procedure is commonly used for routine testing of transformers, cables, bushings, etc.

HAEFELY, the pioneer company for impulse testing since 1904, has been continuously developing and upgrading application specific high-voltage impulse measuring/analyzing solutions over the years. The latest in a long line of distinguished impulse analyzers is the Highest Resolution Impulse Analyzing System HiASTM 744. HAEFELY has set a new highwater mark with unmatched performance. The new front-end solution provides a 16-bit resolution at 250 MS/s with the highest measurement accuracy.
Software, which has been upgraded to suit the new hardware, retains the comfortable interface proven and tested by hundreds of satisfied users. Furthermore, it remains compatible with all previous versions of HiASTM data files, allowing for comparison to older measurements.
The optically decoupled front end provides complete galvanic isolation between control room and test field. It thus affords the personnel the highest safety level and in addition minimizes ground loop, resulting in a reduced interference coupling.

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