Two-stage multi-transformation-ratio standard voltage transformer

Abstract

The invention provides a two-stage multi-transformation-ratio standard voltage transformer in the field of voltage transformers. The two-stage multi-transformation-ratio standard voltage transformer comprises an insulating sleeve, an outer shell, an iron core set, a first shielding cover, a second shielding cover, a wire set, a wiring board, a conducting rod, two shielding plates and a junction box. The wire set is wound on the iron core set; the iron core set is arranged in the first shielding cover; the two shielding plates are respectively arranged at two ends of the iron core set; the ironcore set, the wire group, the first shielding cover and the shielding plate are arranged in the outer shell; the insulating sleeve is arranged at the upper end of the outer shell and is communicatedwith the outer shell; the second shielding cover is arranged in the insulating sleeve; the wiring board is connected with the insulating sleeve; the conducting rod is arranged in the second shieldingcover and is respectively connected with the wiring board and the wire set; the junction box is arranged on the outer side of the outer shell and connected with the wire set. The two-stage multi-transformation-ratio standard voltage transformer has the advantages that the effective voltage range measured by the voltage transformer is widened, that is, the effective voltage range is widened from common 20% Un-120% Un to 1% Un-120% Un while the accuracy is guaranteed.

Description

Technical field [0001] The invention relates to the field of voltage transformers, in particular to a double-stage multi-ratio standard voltage transformer. Background technique [0002] Voltage transformers are similar to transformers in that they are used to transform the voltage on the line. But the purpose of the transformer to transform the voltage is to transmit electrical energy, and the purpose of the voltage transformer to transform the voltage is to measure the voltage of the line. [0003] According to the verification procedure of voltage transformer for measurement, when considering the error of the voltage transformer, the transformer used on the line can only be calibrated for the error of 80%~120% of the rated voltage, and the standard transformer used in the laboratory needs to be calibrated 20%~ The error under 120% of the rated voltage, therefore, when calibrating the transformer, it is necessary to select the corresponding standard voltage transformer according...

AI Technical Summary

Problems solved by technology

For example, the calibration of transformers with rated voltage levels of 500kV, 330kV, 220kV, 110kV, 66kV, 35kV, 10kV, etc. requires a standard voltage transformer of the corresponding rated voltage level, which cannot be achieved through a standard voltage transformer

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