Power Transformer Test Van

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The Megger transformer test van is a vehic-le equipped with a number of instruments for on-site condition assessment of power transfor-mers. The biggest advantage of the van solu-tion compared to separate or multi-functional instruments is its instantaneous readiness to test, quick proceeding to results and clean up at end of testing. All leads are on drums, pre-connected to instruments, through automatic switching no need to climb several times. This results in increased productivity, safety and user comfort, considering an air-conditioned office like work environment.Commissioning testing and preventative main-tenance checks are crucial and often prescribed for safe and uninterruptable operation of power transformers and substations. A combination of routine electric tests and advanced diagnostic techniques in accordance with international standards can be performed with a dedicated transformer test van.Deterioration of electrical insulation may be identified with insulation tests (insulation re-sistance, power factor / dissipation factor and capacitance as well as dielectric frequency res-ponse measurements). Mechanical damage due to transport or through-fault current influence, malfunctions or winding shorts are typically found using frequency response analysis, leaka-ge reactance, winding resistance measurement and on-load tap changer tests. Turns ratio, vec-tor group, no-load and short-circuit loss assess-ments are feasible after repairs to guarantee the high quality of maintenance. Oil samples are routinely taken for dielectric strength measu-rements and dissolved gas analysis. To perform all these tests on-site one typically takes separa-te devices with their own test leads and other accessories. Often it becomes quite time con-suming and challenging in terms of numerous tests schemes and climbs on top of the transfor-mer. The latter could possibly also lead to acci-dents during tests.A dedicated, integrated test van can easily ac-commodate all above mentioned methods/in-struments and facilitate organizing them in an automated workflow. At the heart of the system is a switch box capable of commutating the test leads between several measuring devices and test schemes (connection diagram in figure 1).