Testing method and device of direct current electronic transformer delay time

Abstract

The invention provides a testing method and a testing device of direct current electronic transformer delay time. The method includes steps of applying a step signal to a primary side of a direct current electronic transformer; sampling a secondary side of the direct current electronic transformer to obtain a step standard source signal and a step test product signal; performing a generalized multi-item curve fitting on the step standard source signal and the step test product signal, and acquiring a standard source fitting curve and a test product fitting curve; taking points corresponding to90% of peak values of the standard source fitting curve and the test product fitting curve as reference points; acquiring a standard source reference point and a test product reference point; performing cubic spline interpolation on a longitudinal coordinate of the test product reference point to obtain a step termination moment of a tested transformer; confirming a sampling point which is closest to the standard source reference point in the step standard source signal, and using a cross coordinate of the sampling point as the standard source step termination moment; using the difference between the step termination moment of the tested transformer and the standard source step termination moment as the delay time of the direct current electronic transformer.

Description

technical field [0001] The invention relates to the technical field of DC electronic transformers, in particular to a method and device for testing the delay time of DC electronic transformers. Background technique [0002] The DC electronic transformer is an important primary equipment for the construction and operation of the DC transmission system. It generally uses digital output to provide voltage and current signals for the bay layer equipment, which inevitably involves the delay time of signal transmission. The delay of the DC electronic transformer is the time delay difference between the actual primary electrical quantity collected by the DC transformer and converted into a digital message output. It is one of the core indicators that the control and protection equipment that needs real-time processing is extremely concerned about. The DC transmission control and protection system has extremely high requirements for real-time performance. If the delay time of DC ele...

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Problems solved by technology

[0004] However, because this method cannot distinguish the periodic changes of AC signals, it cannot detect the phase shift in different periodic signals, that is, it cannot calculate the delay time between signals under different periods, so it has defects in technical principles. For DC electronic transformers with AC transmission capability, this method has completely failed. Therefore, there is no theoretical method that can fully support the delay time test of DC electronic transformers in the field of DC transmission.

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