Digitization sampling time delay frequency conversion measuring method and measuring system

Abstract

The invention discloses a digitization sampling time delay frequency conversion measuring method, and the method measures the non integer period time delay to the different frequency steady state analog quantity signals from an electronic transformer or analog inputting and merging unit to obtain the inertial time delay to all frequency signals from the digitization sampling process, including the non integer period time delay and integer period time delay, compensates the sending time difference for SV message based on the transmit frequency of the phaselock technique tracking SV message, reduces the influence caused by the sending time difference for SV message, and raises the digitization sampling time delay measuring precision. The invention also discloses a test system based on the method for ensuring the reliable application of the electronic transformer and the analog inputting and merging unit in the intelligent substation, eliminating the potential safety hazard of the electronic transformer and the analog inputting and merging unit on engineering application, raising the second-order system running veracity for the intelligent substation and having significance to the safe and reliable operation for the intelligent substation.

Description

technical field [0001] The invention relates to a digital sampling delay frequency conversion measurement method and a measurement system, which belong to the technical field of electric power automation. Background technique [0002] Electronic transformers include electronic current transformers (ECT for short, Electronic Current Transformer) and electronic voltage transformers (EVT for short, Electronic Voltage Transformer). The analog input merging unit refers to the merging unit that directly receives the secondary analog output of the conventional transformer, such as the merging unit used to connect the busbar TV. Both the electronic transformer and the analog input merging unit digitally sample the input of the analog, and finally output the digital. Digital sampling replaces conventional cable transmission with optical fiber network transmission, which can avoid problems such as cable multi-point contacts, current transformer secondary open circuit, voltage transfo...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a digital sampling delay frequency conversion measurement method, which solves the problem that the existing measurement method cannot accurately measure the entire cycle delay in the digital sampling link, and also provides a measurement system based on the measurement method , to overcome the safety hazards in the engineering application of electronic transformers and analog input merging units

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