Electronic transformer with self-calibration function and self-calibration method thereof

Abstract

The invention provides an electronic transformer with a self-calibration function. The electronic transformer comprises a sensing head, a signal processing unit, a merging unit, a standard direct current power supply, a multipath switch, a control unit and a calibration module. A standard direct current voltage source is used for outputting a standard signal with a known amplitude and a phase under a calibration mode. The multipath switch is used for switching between the sensing head and the standard direct current voltage source. The control unit is used for making the multipath switch be switched to a standard direct current voltage source side. The calibration module is used for comparing a standard-source detected value calculated and acquired by the merging unit to a standard-source theoretical value so as to acquire a ratio difference and an angle difference of the electronic transformer. The self-calibration function of the electronic transformer is realized and / or whether an acquisition circuit in the signal processing unit works normally is determined.

Description

technical field [0001] The invention relates to the field of electrical measurement, in particular to an electronic transformer with a self-calibration function and a self-calibration method thereof. Background technique [0002] Under the background that the State Grid Corporation is vigorously promoting the construction of smart grids, electronic transformers are different from traditional electromagnetic transformers. They integrate a large number of electronic circuits, use optical fiber to transmit signals, and have the characteristics of low insulation cost and small size. , The huge advantage of intelligence has been developed to a certain extent, adapting to the development trend of the smart grid. At present, with the strong support of the State Grid Corporation, a large number of grid-connected pilots have been put into operation and are in the stage of practical development, hoping to replace the traditional electromagnetic transformer. However, as far as the curr...

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Problems solved by technology

However, after the actual substation is in operation, the time for arranging power outage maintenance plans is relatively tight, and verification cannot be carried out according to the cycle, which brings certain risks to power grid operation and metering and billing

[0004] In addition, the online comparison and calibration methods of electronic transformer error characteristics currently use one or two sets of electromagnetic transformers as reference standards, which require additional standard equipment to run online at the same time

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