Stepped voltage regulating, energy saving and anti-unfraudulent use of electricity type transformer of oil pumping machine

The utility model relates to a stepped voltage regulation type energy saving and electricity stealing preventing transformer for oil pumping units. One end of each of contactors J1-J5 is connected with 2 to 6 output terminals of a controller 1 respectively, and the other end of each of the contactors J1-J5 is connected in a short mode and then is connected with an output terminal 9 of the controller. Three normally open contacts of each group of the J1-J5 are respectively connected with corresponding terminals of a secondary winding of the transformer. The secondary winding of the transformer can automatically change wiring modes according to the load capacity of a motor to keep the motor in a high efficiency working state all the time. After electricity is stolen, the secondary output of the transformer has three phases of voltages of 380V-870V to ensure that any electric appliance can not adapt the varied voltages so that the electric appliance can not work. As a result, the purpose of electricity stealing prevention is achieved.