A method for evaluating the life of offshore substation wall bushings taking into account contamination

Abstract

A method for evaluating the life of an offshore substation wall bushing taking pollution into account is characterized in that a platform for evaluating the life of an offshore substation wall bushing taking pollution into account is built, and the evaluation steps are as follows: a host sends a pollution concentration setting signal to a pollution concentration control device, a pollution spraying device in a test box sprays pollution into the test box, thereby adjusting the pollution concentration in the test box, a pollution concentration tester measures the pollution concentration in the test box every t0 seconds, and transmits the result to a data collection module, the data collection module then transmits the data to the host, turns on the power frequency power supply, a current parameter tester measures the operating current value of the polluted bushing sample under the power frequency voltage, and collects the current parameter through the data collection module, and transmits the current parameter to the host, calculates the life evaluation factor of the wall bushing, and then evaluates the life evaluation factor of the wall bushing to judge whether the wall bushing needs to be replaced. The present invention is mainly devoted to realizing the life evaluation of the offshore wall bushing, and the main implementation method is to consider the life evaluation factor of the wall bushing, which is of great significance to the stable operation of the offshore oil drilling platform.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore bushing protection, and in particular to a method for evaluating the life of an offshore substation wall bushing taking pollution into consideration. Background Art

[0002] As a maritime power, my country is rich in marine resources. Marine energy is closely related to my country's future development and will directly affect my country's stability. Moreover, my country is working hard to become a maritime power. As the main equipment for marine oil and gas development, offshore oil drilling platforms are directly related to the stability of my country's marine oil and gas production. As an important part of the offshore oil drilling platform, the performance requirements of the offshore wall casing are relatively stringent. It must have good insulation performance and sufficient mechanical strength to ensure the air tightness of the casing. The entire offshore oil drilling platform is closely related to the performance of the offshore wall casing. Due to the influence of the environment and the long-term operation of the offshore wall casing, the offshore wall casing will age, and even in serious cases, it will affect the operation safety of the entire offshore oil drilling platform.

[0003] At present, there are few methods for evaluating the life of offshore wall casings under the influence of pollution. The present invention builds an offshore wall casing evaluation platform and calculates the life evaluation factor of the offshore wall casing, which has certain significance for the life evaluation of the offshore wall casing. Summary of the invention

[0004] The purpose of the present invention is to provide a platform and method for evaluating the life of an offshore substation wall bushing taking pollution into account.

[0005] The technical solution for achieving the purpose of the present invention is as follows:

[0006] An offshore substation wall bushing life assessment platform taking into account pollution factors, the platform comprises a grounding device, a test box, a power frequency power supply, a host, a data collection module, a pollution concentration control device, a pollution control device switch, a polluted bushing test piece, a polluted conduit, and a current tester;

[0007] The test box includes a pollution spraying device, a pollution concentration tester, and a dehumidification exhaust fan;

[0008] The host is connected to a pollution concentration control device and an industrial frequency power supply;

[0009] The pollution concentration control device is connected to the pollution control device switch, the pollution control device switch is connected to the pollution conduit, and the pollution conduit is connected to the test box;

[0010] The test box is connected to a grounding device and a data collection module;

[0011] The current tester is connected to a data collection module, and the data collection module is connected to a host;

[0012] The experimental method of the above experimental platform includes the following steps:

[0013] S1: Simulate the working state of the wall bushing under power frequency and perform current parameter test. The specific steps are as follows:

[0014] The pollution concentration in the pollution concentration control device is set to P0 in the host, and the host sends a pollution concentration setting signal to the pollution concentration control device. At this time, the pollution control device switch is turned on, and the pollution spraying device in the test box sprays pollution into the test box, thereby adjusting the pollution concentration in the test box. The pollution concentration tester measures the pollution concentration in the test box every t0 seconds and transmits the result to the data collection module, which then transmits the data to the host and turns off the pollution control switch at the same time;

[0015] S2: Turn on the power frequency power supply, the current parameter tester measures the operating current value of the contaminated bushing test piece under the power frequency voltage, collects the current parameters through the data collection module, and transmits the current parameters to the host;

[0016] S3: uniformly take values ​​at equal intervals within a suitable pollution concentration range, adjust the pollution concentration in the pollution concentration control device through the host, repeat the above steps S1 and S2, and obtain n groups of operating current data I under the test power frequency;

[0017] S4: The life assessment factor α of the wall bushing under different pollution concentrations is calculated by the following formula:

[0018] α=(4.55+1.44lnI-2.33P-4.16(lnI) 2 +2.34P 2 +0.78P ln I) / 1-3.53ln I+6.08P+2.03(ln I) 2 +1.31P 2 -5.93P ln I

[0019] Where, α is the life assessment factor of the wall bushing; I is the power frequency operating current of the bushing under different pollution concentrations, and P is the pollution concentration in the test chamber;

[0020] S5: Evaluation factor for life of wall bushing:

[0021] When the life assessment factor α∈(0, 1] of the wall bushing is greater than α∈(1, +∞), it indicates that the life of the wall bushing is abnormal and needs to be replaced as soon as possible.

[0022] The beneficial effects of the present invention are:

[0023] 1) Ability to accurately calculate the life assessment factor of wall bushing;

[0024] 2) Accurately determine whether the offshore wall bushing needs to be replaced through the life assessment factor;

[0025] 3) The implementation method of the present invention is mainly operated and controlled by a host, which is simple to operate and safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention; DETAILED DESCRIPTION

[0027] The specific implementation of the present invention will be further described below with reference to the accompanying drawings, including the following steps:

[0028] The first step, such as Figure 1 As shown, a platform for evaluating the life of an offshore substation wall bushing taking into account pollution factors is established, the platform comprising a grounding device (1), a test box (2), a power frequency power supply (3), a host (4), a data collection module (5), a pollution concentration control device (6), a pollution control device switch (7), a polluted bushing test piece (8), a polluted conduit (9), and a current tester (10);

[0029] The test box (2) comprises a pollution spraying device (11), a pollution concentration tester (12), and a dehumidification exhaust fan (13);

[0030] The host (4) is connected to a pollution concentration control device (6) and an industrial frequency power supply (3);

[0031] The pollution concentration control device (6) is connected to the pollution control device switch (7), the pollution control device switch (7) is connected to the pollution conduit (9), and the pollution conduit (9) is connected to the test box (2);

[0032] The test box (2) is connected to the grounding device (1) and the data collection module (5);

[0033] The current tester (10) is connected to a data collection module (5), and the data collection module (5) is connected to a host (4); the evaluation method based on the above-mentioned offshore substation wall bushing life evaluation platform taking into account pollution comprises the following steps:

[0034] S1: Simulate the working state of the wall bushing under power frequency and perform current parameter test. The specific steps are as follows:

[0035] The pollution concentration in the pollution concentration control device is set to P0 in the host (4), and the host sends a pollution concentration setting signal to the pollution concentration control device (6). At this time, the pollution control device switch (7) is turned on, and the pollution spraying device (11) in the test box (2) sprays pollution into the test box (2), thereby adjusting the pollution concentration in the test box (2). The pollution concentration tester (12) measures the pollution concentration in the test box (2) every t0 seconds and transmits the result to the data collection module (5). The data collection module (5) then transmits the data to the host (4), and at the same time, the pollution control switch (7) is turned off;

[0036] S2: Turn on the power frequency power supply (3), the current parameter tester (10) measures the operating current value of the dirty bushing test piece (8) under the power frequency voltage, collects the current parameters through the data collection module (5), and transmits the current parameters to the host (4);

[0037] S3: uniformly sampling values ​​at equal intervals within a suitable pollution concentration range, adjusting the pollution concentration in the pollution concentration control device through the host (4), repeating the above steps S1 and S2, and obtaining n groups of operating current data I under the test power frequency;

[0038] S4: The life assessment factor α of the wall bushing under different pollution concentrations is calculated by the following formula:

[0039] α=(4.55+1.44lnI-2.33P-4.16(lnI) 2 +2.34P 2 +0.78P ln I) / 1-3.53ln I+6.08P+2.03(ln I) 2 +1.31P 2 -5.93P ln I

[0040] Where, α is the life assessment factor of the wall bushing; I is the power frequency operating current of the bushing under different pollution concentrations, and P is the pollution concentration in the test chamber;

[0041] S5: Evaluation factor for life of wall bushing:

[0042] When the life assessment factor α∈(0, 1] of the wall bushing is greater than α∈(1, +∞), it indicates that the life of the wall bushing is abnormal and needs to be replaced as soon as possible.

Claims

1. A method for evaluating the life of an offshore substation wall bushing taking into account contamination, characterized in that: Firstly, a platform for evaluating the life of an offshore substation wall bushing taking into account pollution factors is established, the platform comprising a grounding device (1), a test box (2), a power frequency power supply (3), a host (4), a data collection module (5), a pollution concentration control device (6), a pollution control device switch (7), a polluted bushing test piece (8), a polluted conduit (9), and a current tester (10); The test box (2) includes a pollution spraying device (11), a pollution concentration tester (12), and a dehumidification exhaust fan (13); The host (4) is connected to a pollution concentration control device (6) and an industrial frequency power supply (3); The pollution concentration control device (6) is connected to the pollution control device switch (7), the pollution control device switch (7) is connected to the pollution conduit (9), and the pollution conduit (9) is connected to the test box (2); The test box (2) is connected to the grounding device (1) and the data collection module (5); The current tester (10) is connected to the data collection module (5), and the data collection module (5) is connected to the host (4); The method comprises the following steps: S1: Simulate the working state of the wall bushing under power frequency and perform current parameter test. The specific steps are as follows: The pollution concentration in the pollution concentration control device is set to P0 in the host (4), and the host sends a pollution concentration setting signal to the pollution concentration control device (6). At this time, the pollution control device switch (7) is turned on, and the pollution spraying device (11) in the test box (2) sprays pollution into the test box (2), thereby adjusting the pollution concentration in the test box (2). The pollution concentration tester (12) measures the pollution concentration in the test box (2) every t0 seconds and transmits the result to the data collection module (5). The data collection module (5) then transmits the data to the host (4), and the pollution control switch (7) is turned off at the same time. S2: Turn on the industrial frequency power supply (3), the current tester (10) measures the operating current value of the contaminated bushing test piece (8) under the industrial frequency voltage, collects the current parameters through the data collection module (5), and transmits the current parameters to the host (4); S3: uniformly sampling values ​​at equal intervals within a suitable pollution concentration range, adjusting the pollution concentration in the pollution concentration control device through the host (4), repeating the above steps S1 and S2, and obtaining n groups of operating current data I under the test power frequency; S4: The life assessment factor α of the wall bushing under different pollution concentrations is calculated by the following formula: ； Where, α is the life assessment factor of the wall bushing; I is the power frequency operating current of the bushing under different pollution concentrations, and P is the pollution concentration in the test chamber; S5: Evaluation factor for life of wall bushing: When the life assessment factor of the wall bushing When the life of the wall bushing is normal, the life assessment factor of the wall bushing is When it is broken, it indicates that the life of the wall bushing is abnormal and it needs to be replaced as soon as possible.

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