The invention relates to the technical field of metering
voltage transformers in a power
system, and especially relates to a device for improving a secondary load of a
voltage transformer, specifically a device for improving the secondary load of a
voltage transformer for a three-phase three-line
electric energy meter. The device comprises a detected voltage
transformer, a standard voltage transformer, and a transformer calibrator. The load improving the device is connected in parallel in a
secondary loop of the detected voltage transformer, and the measurement of the rated value and a
lower limit value are carried out through the on / off adjustment of the load improving device. The secondary terminals of the standard voltage transformer and the detected voltage transformer are connected with the transformer calibrator. The
system can effectively solve a problem of error measurement of the voltage transformer for the three-phase three-line
electric energy meter, can be used for replacing a conventional
verification voltage transformer load box, is directly connected in the
secondary loop of the detected voltage transformer in a parallel manner, is different from a voltage transformer load box, and does not need to be disassembled. The device is simple in structure, is low in cost, is easy to implement, and does not need to carry the voltage transformer load box.