Early warning method for mixing ratio of C4F7N / CO2 / O2 ternary mixed gas

The temperature and pressure of C4F7N/CO2/O2 ternary mixed gas are sampled and fitted through the density relay, and the slope difference is calculated to provide early warning, which solves the problem of insufficient detection error and real-time performance of mixing ratio change in the prior art, and ensures the safe and stable operation of electrical equipment.

CN119688935AActive Publication Date: 2025-03-25STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Patent Information

Application Number
CN202510206218.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-25
Publication Date
2025-03-25
Estimated Expiration
2045-02-25

AI Technical Summary

Technical Problem

The existing methods for monitoring the density and mixing ratio of C4F7N/CO2/O2 ternary mixed gases have insufficient errors and real-time performance, making it difficult to timely warn of changes in the mixing ratio, affecting the safe and stable operation of electrical equipment.

Method used

The temperature and pressure values ​​of the C4F7N/CO2/O2 ternary mixed gas are sampled and linearly fitted through the density relay, and the difference between the first slope and the second slope is calculated. If the difference is greater than the threshold, a warning is made, specifically, a warning is made for the high or low proportion of C4F7N gas.

Benefits of technology

It improves the accuracy of the output results of the density relay, realizes real-time early warning of the changes in the mixing ratio of C4F7N/CO2/O2 ternary mixed gas, and ensures the safe and stable operation of electrical equipment.

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Abstract

The invention relates to an early warning method for the mixing ratio of C4F7N / CO2 / O2 ternary mixed gas, and belongs to the field of insulating gas monitoring. Comprising the following steps: sampling temperature and pressure values of ternary mixed gas in to-be-tested equipment, and sorting according to the temperature from low to high; performing linear fitting on the sorted temperatures and the corresponding pressure values to obtain a slope of a fitted straight line as a first slope; on the basis of the sampled temperature and the corresponding pressure value as well as a rated mixing ratio and a temperature-pressure characteristic curve built in the density relay, obtaining a pressure value of the sampled pressure value at the temperature of 20 DEG C corresponding to the rated mixing ratio built in the density relay; calculating the average value of the slopes of each sampled pressure value and the corresponding pressure value at 20 DEG C as a second slope; and calculating a difference value between the first slope and the second slope, and if the difference value is greater than a threshold value, performing early warning. According to the method, the difference value between the first slope and the second slope is compared, and when the difference value is greater than the threshold value, early warning is performed, so that the problem of how to perform early warning in time when the mixing ratio of the ternary mixed gas is changed is solved.
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