CN-122024457-A - Gas leakage self-adaptive early warning method for high-voltage switch cabinet under high-low temperature alternating working condition

CN122024457ACN 122024457 ACN122024457 ACN 122024457ACN-122024457-A

Abstract

The application relates to the technical field of high-voltage switch equipment state monitoring and fault early warning, and discloses a high-voltage switch cabinet gas leakage self-adaptive early warning method under a high-low temperature alternating working condition, wherein the method acquires continuous monitoring data of an air chamber to form a monitoring sample sequence; the method comprises the steps of extracting historical non-leakage samples, determining a thermal history state identifier according to a temperature change direction and a continuous change duration, constructing a reference pressure evolution relation, determining a reference pressure evolution result according to a current monitoring sample, generating a leakage driving result according to deviation between actual pressure data and the reference pressure evolution result, calculating residual effective treatment time from an early warning state to a locking state, outputting a gas leakage early warning result according to the residual effective treatment time, and improving accuracy of gas leakage early warning and residual treatment time assessment under high-low temperature alternating working conditions.

Inventors

GUO CAN
FENG XIAOMING
YU XIAOMEI
ZHANG HAILONG
TIAN XU
PENG YINGSONG

Assignees

俊郎电气有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The self-adaptive early warning method for the gas leakage of the high-voltage switch cabinet under the high-low temperature alternating working condition is characterized by comprising the following steps: Step S1, pressure data and temperature data corresponding to acquisition time in a continuous monitoring period of an air chamber are obtained to form a monitoring sample sequence, and a current monitoring sample is determined from the monitoring sample sequence; step S2, extracting historical non-leakage samples from the monitoring sample sequence, determining a thermal history state identifier according to the temperature change direction and the continuous change duration of each historical non-leakage sample in a preset analysis period, and constructing a reference pressure evolution relationship according to the corresponding relationship between the temperature data and the thermal history state identifier; Step S3, determining a current thermal history state identifier corresponding to the current monitoring sample according to a temperature change direction and a continuous change duration in a preset analysis period before the current monitoring sample, and determining a reference pressure evolution result corresponding to the current monitoring sample from a reference pressure evolution relationship according to the temperature data and the current thermal history state identifier of the current monitoring sample; Step S4, generating a leakage driving result corresponding to the current monitoring sample according to the deviation between the actual pressure data of the current monitoring sample and the evolution result of the reference pressure, and calculating the residual effective treatment time from the early warning state to the locking state according to the leakage driving result; and S5, outputting a gas leakage early warning result corresponding to the current monitoring sample according to the remaining effective treatment time.
2. The adaptive early warning method for gas leakage of high-voltage switch cabinet under high-low temperature alternating working condition according to claim 1, wherein the method for extracting historical leak-free samples from the monitoring sample sequence comprises the following steps: And in the historical monitoring samples continuously arranged according to the acquisition time, screening the historical monitoring samples which have the pressure change direction consistent with the temperature change direction and do not enter the early warning state and do not reach the locking state, and determining the screening result as a historical non-leakage sample.
3. The method for adaptively pre-warning gas leakage of a high-voltage switch cabinet under the high-low temperature alternating working condition according to claim 1, wherein the method for determining the thermal history state identifier in the step S2 and the step S3 comprises the following steps: Determining a temperature change direction according to the magnitude relation of adjacent temperature data in a preset analysis period, determining a continuous change duration according to an acquisition time span continuously keeping the same temperature change direction, and determining a combination result of the temperature change direction and the continuous change duration as a thermal history state identifier.
4. The self-adaptive early warning method for gas leakage of high-voltage switch cabinet under high-low temperature alternating working condition according to claim 1, wherein the method for constructing the reference pressure evolution relationship comprises the following steps: Grouping historical leak-free samples according to a temperature interval to which the temperature data belong and a thermal history state identifier, determining a reference pressure value, a reference pressure change rate and a reference acquisition time interval corresponding to each grouping, and establishing a corresponding relation among the temperature interval, the thermal history state identifier, the reference pressure value, the reference pressure change rate and the reference acquisition time interval.
5. The adaptive early warning method for gas leakage of high-voltage switch cabinet under the high-low temperature alternating working condition according to claim 4, wherein the method for determining the evolution result of the reference pressure comprises the following steps: The method comprises the steps of matching a thermal history state identifier with a current thermal history state identifier in a reference pressure evolution relationship, determining a reference pressure value and a reference pressure change rate corresponding to temperature data of a current monitoring sample in a temperature interval, and determining the matching result as a reference pressure evolution result, wherein when the temperature data of the current monitoring sample is located between adjacent temperature intervals, the reference pressure evolution result is generated according to the reference pressure value and the reference pressure change rate corresponding to the adjacent temperature intervals.
6. The adaptive early warning method for gas leakage of high-voltage switch cabinet under the high-low temperature alternating working condition according to claim 4, wherein the deviation comprises the following steps: The pressure difference between the actual pressure data of the current monitoring sample and the reference pressure value in the reference pressure evolution result, and the speed difference between the actual pressure change speed corresponding to the current monitoring sample and the reference pressure change speed in the reference pressure evolution result.
7. The method for adaptively pre-warning gas leakage of a high-voltage switch cabinet under the high-low temperature alternating working condition according to claim 6, wherein the method for generating the leakage driving result comprises the following steps: And determining the leakage driving direction and the leakage driving degree corresponding to the current monitoring sample according to the combination relation of the pressure difference value and the speed difference value, and taking the determined result as a leakage driving result.
8. The adaptive early warning method for gas leakage of high-voltage switch cabinet under the high-low temperature alternating working condition according to claim 4, wherein the method for calculating the remaining effective treatment time comprises the following steps: Determining a pressure interval to be evolved according to actual pressure data of the current monitoring sample and target pressure data corresponding to the locking state, and determining residual effective treatment time corresponding to the pressure interval to be evolved according to a leakage driving result, a reference pressure evolution result and a reference acquisition time interval.
9. The self-adaptive gas leakage early warning method for a high-voltage switch cabinet under the high-low temperature alternating working condition according to claim 1, wherein the method for outputting the gas leakage early warning result comprises the following steps: and matching the residual effective treatment time with a preset time interval, and outputting a corresponding grading early warning result according to the matching result.
10. The adaptive early warning method for gas leakage of high-voltage switch cabinet under the high-low temperature alternating working condition according to claim 1, wherein after outputting the gas leakage early warning result, when the subsequent monitoring result meets the no-leakage updating condition, dynamically updating the reference pressure evolution relationship by using a newly added no-leakage sample comprises the following steps: When the leak-free updating condition is met, updating the corresponding relation record in the reference pressure evolution relation according to the temperature interval and the thermal history state identifier corresponding to the newly added leak-free sample.

Description

Gas leakage self-adaptive early warning method for high-voltage switch cabinet under high-low temperature alternating working condition Technical Field The application relates to the technical field of high-voltage switch equipment state monitoring and fault early warning, in particular to a high-voltage switch cabinet gas leakage self-adaptive early warning method under a high-low temperature alternating working condition. Background The technical scheme is that an SF6 gas density and micro water comprehensive online monitoring device is disclosed in Chinese patent application CN101122554A, the device calculates an SF6 gas density value at 20 ℃ by collecting pressure, temperature and humidity information of SF6 gas, generates and displays a trend curve and provides early warning, the Chinese patent application CN110553801A discloses a multifunctional gas density monitor and a system based on edge calculation, the scheme calculates a gas density value P20 according to gas pressure-temperature characteristics by acquiring pressure signals and temperature signals and carries out alarm processing on the state of monitored electrical equipment, and the technology can reduce the direct influence of temperature change on the monitoring result to a certain extent, thereby improving the continuity and stability of online monitoring. Further, there are also schemes in the prior art to estimate the alarm threshold evolution time, for example US9696248B2 discloses a gas insulated switchgear monitoring scheme to estimate gas density by determining position temperature, pressure and absolute pressure information related to the gas and further calculate the time to alarm threshold and lock-out threshold based on long term density estimation, whereby it can be seen that the prior art has begun to extend from pure static alarm to trend judgment and time threshold estimation. However, under the working condition of alternating high and low temperature, the change of the pressure of the air chamber is not only affected by the leakage state, but also can be affected by the continuous effect of the temperature evolution process in a period of time before the current monitoring sample is formed, although the prior art can judge according to the current temperature, the current pressure, the temperature compensation result, the reference temperature conversion result or the density trend result, part of the schemes can further estimate the time reaching the alarm threshold or the locking threshold, but at least from the disclosure of the schemes, the processing basis of the schemes still mainly surrounds the current time state parameter, the compensated density result, the effective gas temperature estimation result or the long-term trend fitting result, and the temperature change direction and the continuous change duration in a period of time before the current monitoring sample is formed are not taken as independent comparison conditions to be included in the gas leakage early warning processing process. Under the condition, even if two monitoring samples have the same current temperature and similar current pressure, as long as the temperature change direction, continuous change duration and corresponding heating process or cooling process experienced before the two monitoring samples are formed are different, the corresponding natural pressure evolution basis of the air chamber can be different, if the samples are directly used as similar samples according to the current temperature, the current pressure, the compensation result or the converted density result, the working condition basis between the historical reference sample and the current monitoring sample is inconsistent, so that the deviation judgment of the current monitoring result relative to the non-leakage state is distorted easily, the recognition of the current leakage risk state is influenced, the evaluation result of the residual effective treatment time of the equipment, which is continuously evolved from the early warning state to the locking state, is further influenced, and the problem corresponds to the processing key point that the prior disclosed scheme mainly surrounds the current parameter compensation, density estimation and trend calculation. Therefore, the prior art has at least the following problems that under the working condition of high-low temperature alternation, the influence of temperature evolution difference before the formation of a sample on the matching of a non-leakage reference result is reduced, the corresponding accuracy between a current monitoring sample and a non-leakage reference base is improved, the residual effective treatment time of the equipment from an early warning state to a locking state is more accurately estimated on the basis, and the technical problem to be solved in the field is solved. Disclosure of Invention In order to overcome the defect that the prior art is difficult to accurately match a non-leakage ref