Standby transformer automatic switching apparatus operating under economic way substation

Transformer two standby transformer automatically switching the mode of operation of the present invention relates to an economical distribution station apparatus, the apparatus comprising a programmable relay, the relay group made, a signal relay, the relay signal ZXJ, device considering the transformer, the side limit switch is provided, according to the relay input terminal of programmable self relay unit, the signal relay device considering, on both sides of the transformer limit switch connected to said programmable relay output connected to the signal relay ZXJ, the a relay group made the low pressure side of said transformer is connected. Compared with the prior art, the present invention has a simple design, the advantages of good portability.