VA-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.
Specialized testing and monitoring solutions engineered for power industry professionals.
Very low frequency AC hipot test sets from 30 kV to 90 kV peak for after-laying, acceptance and maintenance testing of shielded power cables, generator stators and motor windings. The TD models add tan-delta diagnostics.
View VLF Test Sets →IEC 61850-ready relay test sets for commissioning, maintenance, and troubleshooting of protection systems in digital and conventional substations. 3-phase and 6-phase models available.
View Relay Testers →Portable and laboratory-grade current transformer and potential transformer testing equipment for ratio, polarity, excitation, and burden measurement. Complete CT/PT analysis in a single test set.
View CT/PT Testers →Find authorized distributors and service centers in 40+ countries worldwide. Local support, local language.
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VLF Cable Testing
VLF testing applies a 0.1 Hz sinusoidal AC voltage, so the capacitive charging current is a small fraction of what a 50/60 Hz hipot would draw. That lets a portable set withstand-test long, high-capacitance shielded cables — after laying, on acceptance, and in maintenance — with a voltage distribution that stays close to service conditions.
66 kV acceptance testing needs a higher VLF test voltage than this range provides — contact our engineers before selecting a set.
Technical Guide
Test voltages by cable class, test duration and frequency, sine vs cosine-rectangular waveforms, tan-delta interpretation — and how VLF compares with DC and DAC/OWTS. Built on IEEE 400.2-2024, IEC 60502-2, IEC 60229 and GB/T 3048.8.
Read the VLF Testing GuideFrom substation commissioning to transformer lifecycle management, our solutions cover the full spectrum of electrical testing needs.
Complete testing solutions for new substation deployment and retrofit projects.
From factory testing to online monitoring — manage transformer health across its entire service life.
Relay testing, cable hipot and insulation testing for solar farms, wind plants, and BESS facilities.
Predictive maintenance testing for motors, switchgear, and cables in manufacturing environments.
Portable, rugged instruments for on-site commissioning and troubleshooting crews.
Training-grade test equipment and didactic systems for technical universities.
Expert articles on relay protection, cable and insulation testing, IEC 61850, and transformer diagnostics.
“Which VLF test set do I need for a 33 kV cable?” is the question buyers actually ask, and it...
Read ArticleIEEE 400.2 is the guide that governs field testing of shielded power cable with very low frequency AC at less...
Read ArticleMost VLF hipot test sets look alike on a brochure: a box, a voltage, a weight. The differences that decide...
Read ArticleA VLF hipot test set is not a commodity with a list price. Two units that both say “60 kV”...
Read ArticleQuality Management Systems
European Conformity
Measuring Relays & Protection Equipment
Oil-Filled Equipment Gas Analysis
Restriction of Hazardous Substances
Chemical Safety Compliance
Every VA-TEK product ships with a traceable calibration certificate from our ISO 9001 certified laboratory.
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