Sep 20, 2026
Transformer Turns Ratio Testing: Finding Tap-Changer Problems
A turns ratio test is only as good as the tap position it is compared against. The pattern of deviations...
Read ArticleVA-TEK builds high-voltage test sets, IEC 61850-ready relay protection test systems and transformer diagnostic instruments for utilities, cable contractors, service companies and testing laboratories. From substation commissioning to transformer condition assessment — we deliver the accuracy, reliability, and support your critical assets demand.
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Expert articles on relay protection, cable and insulation testing, IEC 61850, and transformer diagnostics.
Sep 20, 2026
A turns ratio test is only as good as the tap position it is compared against. The pattern of deviations...
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Sep 19, 2026
Three questions decide the machine, in the order a wrong answer hurts: the voltage the cable class needs, the capacitance...
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Sep 19, 2026
Lower frequency buys reach on long, high-capacitance cable and pays for it in time. What sets the vlf test duration,...
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Sep 16, 2026
A withstand test ends in pass or fail. VLF tan delta testing reads the cable's remaining margin from the same...
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