A method and device for measuring time characteristics of a merging unit

Abstract

The invention discloses a method for measuring the time characteristics of a merging unit, which is characterized in that it comprises the following steps: Step 1: The merging unit and the measuring device are synchronized through a clock synchronization signal; Step 2: The measuring device receives the SV message of the merging unit to obtain the SV Message standard interval; Step 3: The measurement device measures the time difference between the time when the SV message arrives at the measurement device and the clock synchronization signal; Step 4: The measurement device locks the transmission interval jitter of the SV message; Step 5: Get the rated value of the merging unit Sampling delay; Step 6: Obtain the discreteness of the SV message sent by the merging unit. The invention also discloses a measuring device combining the unit time characteristic measuring method. The invention solves the problems of complex time characteristic measurement system and cumbersome measurement method of combining units in the intelligent substation, improves measurement efficiency and accuracy, and provides an effective method for large-scale testing after the popularization and construction of the intelligent substation.

Description

technical field [0001] The invention relates to a method for measuring the time characteristics of a merging unit, in particular to a method for measuring the time characteristics of a merging unit based on frequency tracking phase-locking technology. The invention also relates to a measuring device based on the method for measuring the time characteristics of a merging unit. The invention belongs to electric power automation technology field. 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 for analog input, such as the merging unit used to connect the busbar TV. The digital sampling of the electronic transformer and analog input merging unit replaces the conventional cable transmission with optical fiber network transmission, so as to avoid ...

AI Technical Summary

Problems solved by technology

The existing rated sampling delay measurement method generally uses the phase angle relationship between the standard analog quantity and the measured SV data to indirectly measure the rated sampling delay of the electronic transformer or analog input merging unit, but this test method must Relying on the way of adding analog quantities, the test system involves many instruments and equipment, which is more troublesome for on-site testing, and indirect measurement is easily affected by the frequency and interval dispersion of SV message transmission, and its measurement accuracy is affected to a certain extent

However, the discreteness of SV message transmission is now generally measured by message record analyzers or portable operation and maintenance tools, and the measurement of rated sampling delay is two test items, which leads to complex technical problems in the test process

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