Method and Apparatus for Calibrating Voltage Transformer Serial Addition

摘要

A series summation-calibrating device based on a semi-insulating voltage transformer includes a symmetrical high voltage test power supply, a three-port serial voltage transformer, a semi-insulating voltage transformer and an error measuring apparatus. The present invention is characterized by: a complete set of equipment for measuring the traceability of power frequency voltage ratio can be manufactured; calibrating the line according to the serial addition based on the semi-insulating voltage transformer; measuring the relative error between the three-port serial voltage transformer and the semi-insulating voltage transformer; and mathematically processing the measuring result to obtain the voltage coefficient curve of the semi-insulating voltage transformer error. The method is easy to operate without being restricted by voltage level, and can establish, from a low voltage of 10V to a high voltage of 1,000V, a standard power frequency voltage ratio measurement system serving as a measurement standard at the national or provincial/ministerial level.

主权项

1. A series summation calibrating device for a voltage transformer, comprising a symmetry high-voltage test power supply, a series voltage transformer having three-ports, a semi-insulating voltage transformer, an error measuring device, and a plurality of connecting wires, wherein an output of said symmetry high-voltage test power supply is respectively communicated with an input of said series voltage transformer having three-ports and an input of said semi-insulating voltage transformer, wherein said symmetry high-voltage test power supply does not only output an independent voltage, but also output symmetry voltages, which is used for generating and changing a high-voltage power supply for calibrating, wherein output signals from said series voltage transformer having three-ports and said semi-insulating voltage transformer are received by said error measuring device, wherein said error measuring device is used for measuring a voltage error of a voltage U2 of an output of said series voltage transformer having three-ports, referencing a voltage U3 of an output of said semi-insulating voltage transformer.