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Transformer protection relay
TrafoSTART KMB Systems

The TS (TrafoSTART) is an electronic relay for the switching single-phase transformers. The magnetization of the transformer core is maintained in limits during energization. This transformer starting method totally eliminates inrush current with minimal start up time (from 0,06 s). The TrafoSTART is suitable for all kinds of transformers – EI, UI, C, toroidal, at al. Parallel connected transformers of different types can be connected to one TrafoSTART. The TrafoSTART is recommended for frequently switched transformers and for low-losses transformers with high working induction. The device is easily installed into the primary lead. The TrafoSTART can replace transformer contactor, when control input is used.
During startup, the transformer core is re-magnetized to opposite value of magnetization with exactly specified increment in each half period of the supply voltage. Magnetizing impulses are revised according to the primary voltage waveform. Such a principle ensures error-free operation without any transformer secondary load.