High Voltage test

DASOTEC is proud to announce the start of its direct collaboration with the 'Power Diagnostix Service' division of our represented Power Diagnostix, a renowned manufacturer of instruments for the measurement and monitoring of Partial Discharges and Loss Factor

Applied and Induced Voltage Tests with Partial Discharge Measurement

DASOTEC, we work directly with the on-site measurement service division 'Power Diagnostix Service' of our represented Power Diagnostix, a renowned manufacturer of instruments for measuring and monitoring Partial Discharge and Tan Delta.

The Power Diagnostix Service offers on-site measurements of High Voltage insulation conditions on motors and generators, power and distribution transformers, MV and HV class cables and Gas Insulated Switchgears (GIS). In addition, technical support can be offered during FAT and Site Acceptance Tests (SAT), and we also act as independent consultants to locate sources of Partial Discharges within various High Voltage insulation systems. Our measurement reports with summaries and recommendations can often be very useful when making important decisions regarding necessary maintenance actions or design changes in order to prove the reliability of various High Voltage equipment. Measurement service or PD localisation can be performed worldwide. Measurements can be performed either off-line or online.

For off-line testing, we are equipped with two mobile testing systems and portable equipment.

With the Mobile High Voltage Test System, based on a 2 MVA converter, incorporated in a standard 12-metre container, we can offer  induced overvoltage (up to 90 kV) and applied voltage tests (up to 500 kV). The test system is self-contained for on-site tests requiring up to 100 kVA using a generator mounted on the axis of the auxiliary tap. When using the system in resonant mode, it is sufficient to introduce losses and, therefore, 2 kW is sufficient to cover, for example, an applied voltage test of 500 kV. When more input power is required, the test system can be powered by a diesel generator.

The Medium Voltage Mobile Test System comes with a 100 kV/11 kVA AC generator for testing e.g. dry-type transformers, medium voltage switchgear or short cable jumpers. For larger capacitive loads, the van can be extended with a trailer, providing a 500 kVA/50 kV resonant test system. Similar to the larger test system, this system is also self-sufficient for power requirements up to 16 kVA.

Various portable Very Low Frequency (VLF) sources are also available for on-site testing of medium voltage equipment up to 60 kV.

Based on our established expertise in Partial Discharge analysis and the development of testing equipment for various applications, PD Service is the perfect partner for root cause analysis and partial discharge localisation. In addition to on-site measurement surveys, measurement service contracts can also be offered, and remote reporting is possible. Our team of experienced engineers is ready to assist you with any field measurement enquiries.

Your requests

For any queries, please contact us at:


In order to be able to provide a quick response on specific test requests, following the general information is very helpful:

  • Number of equipment to be tested
  • Equipment characteristics / nameplate data
  • Pictures or technical drawings
  • Place and date of test
  • Reason for test (e.g. FAT/SAT or diagnostic test)
  • Test standard

After assessing your request, we will contact you to clarify all details regarding site tests.

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