Test van for maintenance and diagnostics of power transformers
■The Megger transformer test van is a vehicle equipped with a number of instruments for on-site condition assessment of power transformers. The biggest advantage of the van solution compared to separate or multifunctional 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 maintenance 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 resistance, power factor / dissipation factor and capacitance as well as dielectric frequency response measurements). Mechanical damage due to transport or through-fault current influence, malfunctions or winding shorts are typically found using frequency response analysis, leakage reactance, winding resistance measurement and on-load tap changer tests. Turns ratio, vector group, no-load and short-circuit loss assessments are feasible after repairs to guarantee the high quality of maintenance. Oil samples are routinely taken for dielectric strength measurements and dissolved gas analysis. To perform all these tests on-site one typically takes separate devices with their own test leads and other accessories. Often it becomes quite time consuming and challenging in terms of numerous tests schemes and climbs on top of the transformer. The latter could possibly also lead to accidents during tests.
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Supplier and Product Introduction |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2015/8/7 |
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V02C |
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TRANSFORMER-VAN_BR_EN_V02C |
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1.9 MB |
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