DC transformer calibrator and working method thereof

Abstract

The invention provides a DC transformer calibrator and a working method thereof. The calibrator comprises a first digital multimeter for collecting a first standard analog signal of a standard DC transformer or a second standard analog signal of the standard DC transformer; a second digital multimeter for collecting an analog signal to be calibrated of a DC transformer to be calibrated; a GPIB acquisition card for collecting the first standard analog signal and the analog signal to be calibrated, or collecting the second standard analog signal; a protocol converter for converting the collecteddigital signal of an FT3 protocol into sampling data to be calibrated of a TCP / IP protocol; and a PC industrial computer for determining steady-state errors of an analog-output type DC transformer according to the first standard analog signal and the analog signal to be calibrated, or determining steady-state errors of a digital-output type DC transformer according to the second standard analog signal and the sampling data to be calibrated. The technical scheme above realizes calibration of the analog-output type and digital-output type DC transformers.

Description

Technical field [0001] The invention relates to the technical field of equipment calibration, in particular to a DC transformer calibrator and a working method. Background technique [0002] With the advancement of the global energy Internet and the continuous development of DC transmission, DC transformers are the key equipment for measuring DC voltage and current signals in DC transmission projects. Their measurement accuracy is related to the stability and reliability of the control and protection of DC transmission projects. To ensure the safe and stable operation of DC transmission projects, it is necessary to verify and calibrate DC transformers. As a calibration and verification device for DC transformers, DC transformer calibrators are used more and more. [0003] At present, DC transformer calibrators basically use the principle of direct measurement method. The accuracy of the calibrator needs to be two higher than that of DC transformers. The accuracy level of DC transfo...

AI Technical Summary

Problems solved by technology

Among them, the DC transformer calibrator of the first two principles above generally adopts an integral structure, and the DC transformer calibrator of the embedded principle has more functions and is suitable for on-site use, but the human-computer interaction experience is not friendly and the operation is inconvenient; The DC transformer calibrator based on the acquisition card principle has high sampling accuracy, but the acquisition card is easy to loose during on-site transportation; the DC transformer calibrator based on the high-precision digital meter principle has high sampling accuracy and convenient value traceability, which is suitable for use in laboratories. Use, but due to the split structure, it is inconvenient to use and transport on site

[0005] In addition, the existing DC transformer calibrator cannot realize the error calibration of analog output type and digital output type DC transformers

[0006] For the above problems, no effective solutions have been proposed so far

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