Method and device for measuring merging unit time characteristics

Abstract

The invention discloses a method for measuring merging unit time characteristics. The method is characterized by comprising steps that: first step, synchronization of the merging unit and a measuring device is realized through a clock synchronization signal; second step, an SV message of the merging unit is received by the measuring device, and a standard interval of the SV message is acquired; third step, a time difference of arrival time of the SV message to the measuring device and the clock synchronization signal is measured by the measuring device; fourth step, sending interval jitter of the SV message is locked by the measuring device; fifth step, rated sampling time-delay of the merging unit is acquired; and sixth step, discreteness of the merging unit for sending the SV message is acquired. Through the method and the device, problems that a merging unit time characteristic measuring system in an intelligent transformer station is complex and a measuring method is tedious are solved, measuring efficiency and measuring accuracy are improved, so an effective method is provided for a large scale test on the intelligent transformer station after popularization construction.

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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