CN-121980112-A - Method, device, equipment and medium for detecting moisture content in transformer oil

CN121980112ACN 121980112 ACN121980112 ACN 121980112ACN-121980112-A

Abstract

The invention relates to a method, a device, equipment and a medium for detecting the moisture content in transformer oil, and belongs to the technical field of power transformers. The technical scheme includes that transformer oil flows through a humidity-sensitive capacitance sensor and enables the transformer oil to output voltage signals, a revolving door algorithm is used for processing the output voltage signals based on initial compression offset, then the compression offset is gradually reduced until compression errors meet preset compression error thresholds, linear interpolation processing is conducted on the compressed voltage signals, time constants and capacitance are calculated based on the voltage signals after the interpolation processing, moisture content in the transformer oil is further calculated through combining a humidity-sensitive capacitance humidity-sensitive characteristic curve and the calculated capacitance, and a calculation result is transmitted to a user terminal. The invention effectively solves the defect of high error in detecting the moisture content in the transformer oil, and solves the problem of long consumption of the moisture content test result in the oil caused by a series of complex processes such as billing, oil taking, oil transportation and transportation, oil micro-water test and the like.

Inventors

CHEN DONGYANG
ZHANG XINLIANG
ZHU JIALI
WANG XIN
Wu Haodai
WANG JIE
LIU XINYUE
LIU ZIMO
MENG DEFANG
ZHANG CHENG
GAO LISHUAI
QUAN LI
SUN JIAHUI
LI ZHUANG
ZHOU YONGJUN
MIAO HONGYING
CHEN SIQI
HE YUXIN
LIU LIJIE
ZHANG WANMING
Xi Haikuo
GAO PENG
DU WEIWEI
GUO JIANFENG
QI DAWEI
YU WENHAO
YU DE
YANG MANMAN

Assignees

国网冀北电力有限公司承德供电公司

Dates

Publication Date: 20260505
Application Date: 20260116

Claims (8)

1. The method for detecting the moisture content in the transformer oil is characterized by comprising the following steps of: (1) Through an oil pipe built in the transformer, transformer oil flows through a humidity-sensitive capacitance sensor, and voltage signals output by the humidity-sensitive capacitance are recorded; (2) The method comprises the steps of processing recorded voltage signals by using a revolving door algorithm, firstly selecting a compression offset E, determining an initial compression offset, compressing the voltage signals by using the revolving door algorithm, and calculating a compression error; (3) Judging whether the compression error meets a preset compression error threshold, if not, executing the next step, reducing the compression offset E of the rotation gate algorithm by using a designed compression offset reduction formula, compressing the voltage signal again by using the rotation gate algorithm, calculating the compression error, repeating the step until the compression error meets the preset compression error threshold, and then performing linear interpolation processing on the compressed voltage signal; (4) Based on the voltage signal after interpolation processing, calculating the time constant and the capacitance of the humidity-sensitive capacitance sensor, calculating the moisture content of transformer oil according to the humidity-sensitive characteristic curve of the humidity-sensitive capacitance sensor and the capacitance of the humidity-sensitive capacitance, and transmitting the calculation result to a user terminal.
2. The method of claim 1, wherein in the step (2), the initial compression offset is selected as a difference between a maximum value and a minimum value of the output voltage signal of the humidity sensor.
3. The method for detecting the water content in the transformer oil according to claim 2, wherein in the step (2), the calculation flow of the revolving door algorithm is as follows: 1) Initialization of (1) In the formula, And Respectively the initial time and the corresponding data value; And Respectively the 1 st moment and the corresponding data value; And Initial values of slopes of the upper fulcrum door and the lower fulcrum door respectively; E is the compression offset; 2) Calculating slope (2) Wherein: And The j time and the corresponding data value are respectively; And Respectively the kth moment and the corresponding data value; 3) Slope update (3) 4) Data extraction (4) If the formula (4) is satisfied, the previous time is taken Data values of (2) Recording as characteristic data and returning to the step 2), otherwise returning to the step 3).
4. The method for detecting the water content in the transformer oil according to claim 1 or 2, wherein in the step (3), the designed compression offset reduction formula is as follows: (5) where n is the number of cycles for performing the compression offset reduction process, E (n) and E (n 1) Respectively represent the nth time and the nth time Compression offset at 1 cycle.
5. The method for detecting the moisture content of transformer oil according to claim 1 or 2, wherein in the step (4), the moisture content of the transformer oil is calculated based on a moisture sensing characteristic curve of a moisture sensor, and the moisture sensing characteristic curve of the moisture sensor has the following formula: (6) Wherein Y is the moisture content in oil of the transformer, the unit is mg/L, C is the capacitance of the humidity-sensitive capacitor calculated according to the output voltage signal of the humidity-sensitive capacitor sensor, and the unit is pF.
6. A device for detecting the moisture content of transformer oil is characterized by being used for realizing the method for detecting the moisture content of the transformer oil according to any one of claims 1-5, and comprising the following steps: ① The digital power supply module is used for supplying continuous and stable power to the device so as to ensure the reliable operation of the device; ② The humidity-sensitive capacitance sensor module is used for collecting the moisture content in the oil of the transformer and accurately and rapidly outputting voltage signals; ③ The revolving door algorithm module is used for compressing the voltage signals acquired by the humidity-sensitive capacitance sensor; ④ The DSP controller module is used for programming a revolving door algorithm program and calculating time constant, capacitance and moisture content in transformer oil based on a voltage signal compression result; ⑤ The 5G network communication module is used for transmitting the calculation result of the water content in the transformer oil to the user terminal; ⑥ The stainless steel three-way flange fixing module is used for fixing the humidity-sensitive capacitance sensor probe and the transformer oil pipe and ensuring that the transformer oil smoothly flows through the humidity-sensitive capacitance.
7. A terminal device, characterized by comprising: ① One or more processors; ② A memory coupled to the processor for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the method for detecting the moisture content in transformer oil according to any one of claims 1 to 5.
8. A computer readable storage medium having stored thereon a computer program for execution by a processor to perform a method of detecting moisture content in transformer oil according to any one of claims 1-5.

Description

Method, device, equipment and medium for detecting moisture content in transformer oil Technical Field The invention relates to a method, a device, equipment and a medium for detecting the moisture content in transformer oil, and belongs to the technical field of power transformers. Background The power transformer is used as a core of energy conversion in the power transmission and distribution process, is a key device for ensuring the safe operation of a power system, and the health condition of an insulation system of the power transformer is directly related to the safe and stable operation of the whole power grid. The presence of moisture can significantly affect the performance of transformer insulating oil, leading to accelerated insulation aging and reduced thermal management efficiency. Therefore, detecting and controlling the moisture content of transformer insulating oil is critical to maintaining transformer insulation strength and reducing the risk of failure. The method for detecting the moisture content in the transformer oil in the prior art comprises the steps of firstly opening a working ticket according to a power failure or electrified detection plan of a power supply company, then taking out insulating oil of the transformer, and then conveying the insulating oil to an oiling laboratory to detect the moisture by using a micro moisture detector based on a Karl Fischer titration principle. Because manual oil extraction and oiling test are needed, transformer insulating oil is easy to contact with air in the oil extraction and test processes, so that detection errors are increased, and particularly, the detection errors are larger in an environment with higher humidity. In addition, for the region with larger power supply area, the distance between part of the 500kV transformer substation and the oiling laboratory is longer, and the transformer oil is transported for a longer time, so that the defect that test results wait for a longer time also exists. In summary, the existing method for detecting the moisture content of the transformer oil has the problem of high detection error, and needs to go through a series of complex processes of billing, oil taking, oil transportation, oil micro-water test and the like, so the method also has the defect of long time consumption of test results. Disclosure of Invention The invention provides a method, a device, equipment and a medium for detecting the moisture content in transformer oil, which effectively reduce the detection error of the moisture content in the transformer oil, reduce the time required for giving out a test result of the moisture content in the transformer oil and solve the technical problems existing in the prior art. The technical scheme of the invention is as follows: A method for detecting the moisture content in transformer oil comprises the following steps: (1) Through an oil pipe built in the transformer, transformer oil flows through a humidity-sensitive capacitance sensor, and voltage signals output by the humidity-sensitive capacitance are recorded; (2) The method comprises the steps of processing recorded voltage signals by using a revolving door algorithm, firstly selecting a compression offset E, determining an initial compression offset, compressing the voltage signals by using the revolving door algorithm, and calculating a compression error; (3) Judging whether the compression error meets a preset compression error threshold, if not, executing the next step, reducing the compression offset E of the rotation gate algorithm by using a designed compression offset reduction formula, compressing the voltage signal again by using the rotation gate algorithm, calculating the compression error, repeating the step until the compression error meets the preset compression error threshold, and then performing linear interpolation processing on the compressed voltage signal; (4) Based on the voltage signal after interpolation processing, calculating the time constant and the capacitance of the humidity-sensitive capacitance sensor, calculating the moisture content of transformer oil according to the humidity-sensitive characteristic curve of the humidity-sensitive capacitance sensor and the capacitance of the humidity-sensitive capacitance, and transmitting the calculation result to a user terminal. In the step (2), the initial compression offset is selected as the difference between the maximum value and the minimum value of the output voltage signal of the humidity sensor. In the step (2), the calculation flow of the revolving door algorithm is as follows: 1) Initialization of (1) In the formula,AndRespectively the initial time and the corresponding data value; And Respectively the 1 st moment and the corresponding data value; And Initial values of slopes of the upper fulcrum door and the lower fulcrum door respectively; E is the compression offset; 2) Calculating slope (2) Wherein: And The j time and the corresponding data v