Sampling adaptive direct-current electronic transformer detection converter

Abstract

The present invention provides a sampling adaptive direct-current electronic transformer detection converter. A main control module controls the channel switching of the first input channel, second input channel and third input channel of a multiplexer, and therefore, large current input signals are inputted through a first input channel port and are converted into small voltage signals through amilliohm-level precision resistor, small current input signals are inputted through a second input channel port and are converted into small voltage signals through a conventional compact resistor, and the small voltage signals are inputted through a third input channel port. Thus, the large current input signals, the small current input signals and the small voltage signals can be adaptively converted by the converter of the present invention. The sampling of different types of analog quantity input signals can be completed, and the analog quantity input signals can be converted into corresponding coded digital signals; the coded digital signals are sent to a backend calibrator body device; and therefore, the closed-loop calibration of a direct-current transformer can be realized, and a technical problem that existing direct-current transformer closed-loop test needs to replace a converter repeatedly can be solved.

Description

technical field [0001] The invention relates to the technical field of direct current transformers, in particular to a sampling self-adaptive direct current electronic transformer detection converter. Background technique [0002] The DC transformer provides accurate and reliable sampling and measurement information. Its operation reliability and measurement accuracy are directly related to the operation stability and reliability of the DC control and protection system. It is an important link in the DC transmission system. In order to ensure the reliable operation of the DC transformer, it is necessary to carry out pre-commissioning tests and periodic regular inspections on the DC transformer. During on-site operation, due to the lack of relevant standard procedures and unified and perfect on-site verification methods and test devices, the on-site test of DC transformers can generally only be performed on DC open-loop tests. This test method not only requires extremely high...

AI Technical Summary

Problems solved by technology

[0008] Therefore, it is necessary to design a converter that can automatically switch interfaces and handle small voltage signals, small current signals

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