Power supply type voltage transformer and electric energy metering device

Abstract

A power supply type voltage transformer and an electric energy metering device, the power supply type voltage transformer includes: an iron core, a primary winding, a first secondary winding, a second secondary winding, a first feedthrough current transformer, a second feedthrough core current transformer and impedance; the ground terminal of the primary winding is connected in series with the second feedthrough current transformer; the ground terminal of the first secondary winding is connected in series with the first feedthrough current transformer; the second secondary winding circuit is connected in series with the impedance, And the impedance is connected in parallel with the first feedthrough current transformer; the primary winding, the first secondary winding, and the second secondary winding are all wound on the iron core; wherein, the secondary output current terminal of the second feedthrough current transformer As a current sampling terminal, it is used for current measurement; as a voltage sampling terminal, the second secondary winding terminal is used for voltage measurement. Through the power supply type voltage transformer provided by the embodiment of the present invention, the simultaneous measurement of current and voltage is realized, which fills the technical blank of the power supply type voltage transformer in electric energy measurement.

Description

technical field [0001] The invention relates to the field of electrical equipment, in particular to a power supply type voltage transformer and an electric energy metering device. Background technique [0002] The power supply type voltage transformer is a voltage transformer with power supply function, which is mainly used to supply power to scattered small loads such as remote mountainous areas. At present, there has not been any electric energy metering for power supply type voltage transformers at home and abroad. Although there is already a measurement of transformer power, there is still a big difference between the power supply type voltage transformer and the transformer. If the transformer power metering technology is used for the power supply type voltage transformer, the following problems will occur: [0003] 1) Because the accuracy level of the metering winding of the power supply type voltage transformer is affected by the fluctuation of the power supply load,...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention proposes a power supply type voltage transformer and an electric energy metering device, aiming at solving the problem in the related art that the electric energy metering of the power supply type voltage transformer cannot be realized

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