An intelligent evaluation method for the aging state of post insulators in a hot and humid environment

Abstract

The present invention discloses an intelligent evaluation method for the aging state of a post insulator in a hot and humid environment. The intelligent evaluation method for the aging state of a post insulator in a hot and humid environment can achieve the purpose of rapid testing and judgment when the aging phenomenon of the post insulator in the substation occurs. The intelligent evaluation method includes the construction and testing of a hot and humid environment simulation platform, calculation of characteristic parameters of the aging state of the post insulator, evaluation of the aging state of the post insulator to be tested, and then judgment of the aging state and service performance of the post insulator. At the same time, the present invention can also reduce the impact caused by phenomena such as flashover and creepage of insulators, and further improve the operational reliability of the post insulators. The beneficial effect of the present invention is that the aging phenomenon of the post insulators used in urban power transmission and distribution can be quickly tested and judged efficiently and conveniently to achieve reliable operation.

Description

Technical Field

[0001] The invention relates to the field of fault evaluation of post insulators, and in particular to an intelligent evaluation method for the aging state of post insulators in a hot and humid environment. Background Art

[0002] Post insulators are widely used in power systems. They are widely used in busbar support of power plants, substations, switch stations, etc., or insulation of disconnectors, etc., especially for post insulators used outdoors. Due to the harsh operating environment, large changes in humidity and temperature, the aging of post insulators is serious, which greatly reduces their insulation capacity and easily causes flashover or shed creepage of post insulators, affecting the busbar safety of important power facilities such as substations. On the leeward side of the shed of outdoor post insulators, a large amount of dirt is easily accumulated. Due to the special application sites of some post insulators, it is very difficult to clean the dirt, which further aggravates the aging of the insulators and causes the flashover phenomenon of the insulators to intensify.

[0003] At present, in actual testing, the detection of the aging state of rubber-type post insulators mostly uses leakage current, hydrophobic performance and other detection methods, but these methods all require the post insulators to be removed and sent to the laboratory for special experimental testing, which is time-consuming and labor-intensive, and the detection effect is not ideal. Therefore, in order to reduce the workload of on-site testing and improve the efficiency and accuracy of testing, it is necessary to conduct research on the changes in the aging state of post insulators in a hot and humid environment, and propose an intelligent method that can efficiently and accurately evaluate the aging state of post insulators. Summary of the invention

[0004] The purpose of the present invention is to provide an intelligent evaluation method for the aging state of a post insulator in a hot and humid environment.

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

[0006] An intelligent evaluation method for the aging state of a post insulator in a hot and humid environment is used to achieve the purpose of rapid testing and judgment when the aging phenomenon of the post insulator in a substation occurs, including a post insulator hot and humid environment simulation platform and an intelligent evaluation method for the aging state of the post insulator in a hot and humid environment, characterized in that:

[0007] 1. A post insulator wet and hot environment simulation platform, including the following features:

[0008] A support insulator humid heat environment simulation platform comprises a humidity adjustment system (1), a first humidifier (2), a second humidifier (3), a rubber umbrella skirt (4), an upper hardware (5), a fastening nut (6), a metal bolt (7), a fourth humidifier (8), a third humidifier (9), a third wireless humid heat sensor (10), a fourth wireless humid heat sensor (11), a third resistance wire (12), a fourth resistance wire (13), a high-voltage connecting wire (14), a frequency domain dielectric spectrum tester (15), a low-voltage acquisition wire (16), a low-voltage connecting terminal (17), a supporting metal base (18), a temperature control system (19), a first resistance wire (20), and a second resistance wire (21). , a first wireless humidity and heat sensor (22), a second wireless humidity and heat sensor (23), a computer (24), and an organic glass test box (25); the metal bolt (7) is connected to the high voltage end of the frequency domain dielectric spectrum tester (15) through a fastening nut (6) and a high voltage connecting line (14); the supporting metal base (18) is connected to the low voltage end of the frequency domain dielectric spectrum tester (15) through a low voltage connecting terminal (17) and a low voltage acquisition line (16) tightly clamped thereon; the frequency domain dielectric spectrum tester (15) transmits the test data to the computer (24) through a coaxial cable; the first resistance wire (20), the second resistance wire (21), the third resistance wire (12), and the fourth resistance wire ( 13) are placed at the bottom of the organic glass test box (25) and are respectively connected to the temperature control system (19), and the temperature control system (19) is connected to the computer (24) through a coaxial cable; the first humidifier (2), the second humidifier (3), the third humidifier (9) and the fourth humidifier (8) are placed on the upper part of the organic glass test box (25) and are respectively connected to the humidity control system (1), and the humidity control system (1) is connected to the computer (24) through a coaxial cable; the first wireless humidity and heat sensor (22), the second wireless humidity and heat sensor (23), the third wireless humidity and heat sensor (10), and the fourth wireless humidity and heat sensor (11) are placed in the middle of the organic glass test box (25) and transmits the data to a computer (24) via a wireless network; the computer (24) issues instructions to a humidity adjustment system (1) and a temperature control system (19) based on the data detected by the first wireless humidity and heat sensor (22), the second wireless humidity and heat sensor (23), the third wireless humidity and heat sensor (10), and the fourth wireless humidity and heat sensor (11), and controls the first humidifier (2), the second humidifier (3), the third humidifier (9), the fourth humidifier (8) or the first resistance wire (20), the second resistance wire (21), the third resistance wire (12), and the fourth resistance wire (13) connected thereto respectively through the humidity adjustment system (1) and the temperature control system (19).

[0009] 2. An intelligent evaluation method for the aging state of a post insulator in a hot and humid environment, comprising the following steps:

[0010] The first step: turning on the humidity adjustment system (1) and the temperature control system (19), and setting different target values ​​ρ for the first humidifier (2), the second humidifier (3), the third humidifier (9), the fourth humidifier (8) or the first resistance wire (20), the second resistance wire (21), the third resistance wire (12), and the fourth resistance wire (13) respectively. w0 At T0, the system starts to work, and at the same time, the first wireless humidity and heat sensor (22), the second wireless humidity and heat sensor (23), the third wireless humidity and heat sensor (10), and the fourth wireless humidity and heat sensor (11) monitor the humidity ρ in the organic glass test box (25) in real time. w and temperature T. When the preset target value is reached and stabilized, the temperature is left to stand for 1 hour to allow the wet and hot environment to be in a balanced state, and then the frequency domain dielectric spectrum tester (15) is turned on.

[0011] Step 2: Use the frequency domain dielectric spectrum tester (15) to test the post insulator under humidity ρ w0 The dielectric loss value tanδ at multiple frequency points under temperature T0, the test frequency point f i They are 0.001Hz, 0.002Hz, 0.005Hz, 0.01Hz, 0.02Hz, 0.05Hz, 0.1Hz, 0.2Hz, 0.5Hz, 1Hz, where i = 0, 1, 2, ..., 9, and the corresponding dielectric loss tanδ is obtained respectively. i , that is, the test result at 0.001Hz is recorded as tanδ0, the test result at 0.002Hz is recorded as tanδ1, ..., the test result at 1Hz is recorded as tanδ9, and the test data is saved and transmitted to the computer (24) to continue the evaluation;

[0012] Step 3: Influence factor θ at characteristic frequency point i The pursuit of

[0013] Substitute tanδ0, tanδ1, …, tanδ9 into the following formulas to estimate the influence factors θ0, θ1, …, θ9 of the post insulators under the damp and hot environment:

[0014] θ i =0.2545 (i+1) *tanδ i +0.1093*(i+1) (1)

[0015] Where i = 0, 1, 2, ..., 9, tanδ i For different test frequency points f i The corresponding dielectric loss value, θ i The supporting insulator has different characteristic frequencies f iThe influence factor at this point, without considering the influence of the external environmental temperature, only record the temperature T inside the plexiglass test chamber (25) during the test, and T = T0;

[0016] Step 4: Aging state proportion index μ i Estimation

[0017] Based on the influence factor θ obtained in the third step i Value, substitute θ0, θ1, …, θ9 into the estimation formula respectively, and obtain

[0018] Aging state proportion indexes μ0, μ1, …, μ9;

[0019]

[0020] Step 5: Calculate the aging state characteristic parameters of the post insulator

[0021] Based on the humidity ρ w0 And the dielectric loss values tanδ0, tanδ1, …, tanδ9 and aging state proportion indexes μ0, μ1, …, μ9 of the post insulator at different frequency points under the temperature T0, calculate the aging state characteristic parameter J of the post insulator, and the calculation formula

[0022] is as follows:

[0023]

[0024] Step 6: Evaluate the aging state of the post insulator to be tested

[0025] According to the content of the first to fifth steps, continue to set the thresholds J1 and J2 as the judgment basis, and make the following judgments,

[0026] When J < J1, it is judged that the state of the post insulator is good or in a slight aging state and can operate normally;

[0027] When J1 ≤ J < J2, it is judged that the post insulator is in a moderate aging state and needs to be monitored in real time;

[0028] When J ≥ J2, it is judged that the post insulator is in a severe aging state, with poor anti - flashover or creepage ability, and needs to be replaced or further tested by discharge tests.

[0029] Furthermore, it also includes the following steps:

[0030] For the intelligent evaluation method of the aging state of the post insulator in a humid - heat environment, the magnitudes of the thresholds J1 and J2 can be changed according to the differences in the post insulator manufacturer, operating environment, and material properties, so as to be more suitable for the intelligent evaluation of the aging state of the support insulator in different humid - heat environments.

[0031] The beneficial effects of the present invention are:

[0032] 1. The intelligent evaluation method for the aging state of the post insulators in a hot and humid environment of the present invention can efficiently, accurately, in real time and conveniently evaluate the aging phenomenon of the post insulators used in areas such as substations, avoid flashover problems caused by aging of the post insulators, and realize reliable operation of the substation.

[0033] 2. The intelligent evaluation method of the aging state of the post insulator in a hot and humid environment of the present invention can handle the aging failure of the post insulator, through on-site testing and analysis, and provide a basis for on-site personnel to further explore the service performance of the post insulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the post insulator wet and hot environment simulation platform of the present invention; DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] Figure 1 The structure diagram of the post insulator wet and hot environment simulation platform of the present invention is used to simulate the wet and hot environment of the post insulator and detect the aging state. Its structure and use method include the following contents:

[0037] The constructed support insulator humid heat environment simulation platform mainly comprises a humidity adjustment system (1), a first humidifier (2), a second humidifier (3), a rubber umbrella skirt (4), an upper hardware (5), a fastening nut (6), a metal bolt (7), a fourth humidifier (8), a third humidifier (9), a third wireless humid heat sensor (10), a fourth wireless humid heat sensor (11), a third resistance wire (12), a fourth resistance wire (13), a high-voltage connecting wire (14), a frequency domain dielectric spectrum tester (15), a low-voltage acquisition wire (16), a low-voltage connecting terminal (17), a supporting metal base (18), a temperature control system (19), a first resistance wire (20), The invention is composed of a second resistance wire (21), a first wireless humidity and heat sensor (22), a second wireless humidity and heat sensor (23), a computer (24), and a plexiglass test box (25); a metal bolt (7) is connected to a high voltage end of a frequency domain dielectric spectrum tester (15) through a fastening nut (6) and a high voltage connecting line (14); a supporting metal base (18) is connected to a low voltage end of a frequency domain dielectric spectrum tester (15) through a low voltage connecting terminal (17) and a low voltage collection line (16) tightly clamped thereon; and the frequency domain dielectric spectrum tester (15) transmits test data to the computer (24) through a coaxial cable; a first resistance wire (20), a second resistance wire (21), a third wireless humidity and heat sensor (23), a computer (24), and a plexiglass test box (25); a metal bolt (7) is connected to a high voltage end of a frequency domain dielectric spectrum tester (15) through a fastening nut (6) and a high voltage connecting line (14); a supporting metal base (18) is connected to a low voltage end of a frequency domain dielectric spectrum tester (15) through a low voltage connecting terminal (17) and a low voltage collection line (16) tightly clamped thereon; and the frequency domain dielectric spectrum tester (15) transmits test data to the computer (24) through a coaxial cable; The resistance wire (12) and the fourth resistance wire (13) are placed at the bottom of the organic glass test box (25) and are respectively connected to the temperature control system (19), and the temperature control system (19) is connected to the computer (24) through a coaxial cable; the first humidifier (2), the second humidifier (3), the third humidifier (9), and the fourth humidifier (8) are placed at the top of the organic glass test box (25) and are respectively connected to the humidity control system (1), and the humidity control system (1) is connected to the computer (24) through a coaxial cable; the first wireless humidity and heat sensor (22), the second wireless humidity and heat sensor (23), the third wireless humidity and heat sensor (10), and the fourth wireless humidity and heat sensor (1 1) is placed in the middle of an organic glass test box (25), and transmits data to a computer (24) through a wireless network; the computer (24) can issue instructions to a humidity adjustment system (1) and a temperature control system (19) through the data detected by a first wireless humidity sensor (22), a second wireless humidity sensor (23), a third wireless humidity sensor (10), and a fourth wireless humidity sensor (11), and respectively control a first humidifier (2), a second humidifier (3), a third humidifier (9), a fourth humidifier (8) or a first resistance wire (20), a second resistance wire (21), a third resistance wire (12), and a fourth resistance wire (13) connected thereto.

[0038] The following are the tests conducted on the constructed post insulator damp heat environment simulation platform:

[0039] The first step is to turn on the humidity adjustment system (1) and the temperature control system (19), and set different target values ​​ρ for the first humidifier (2), the second humidifier (3), the third humidifier (9), the fourth humidifier (8) or the first resistance wire (20), the second resistance wire (21), the third resistance wire (12), and the fourth resistance wire (13). w0 At T0, the system starts to work, and at the same time, the first wireless humidity and heat sensor (22), the second wireless humidity and heat sensor (23), the third wireless humidity and heat sensor (10), and the fourth wireless humidity and heat sensor (11) monitor the humidity ρ in the organic glass test box (25) in real time. w and temperature T, and when reaching the preset target value and stabilizing, leaving it to stand for 1 hour to allow the wet and hot environment to be in a balanced state, then starting the frequency domain dielectric spectrum tester (15);

[0040] Step 2: Use the frequency domain dielectric spectrum tester (15) to test the post insulator under humidity ρ w0 The dielectric loss value tanδ at multiple frequency points under temperature T0, the test frequency point f i They are 0.001Hz, 0.002Hz, 0.005Hz, 0.01Hz, 0.02Hz, 0.05Hz, 0.1Hz, 0.2Hz, 0.5Hz, 1Hz, where i = 0, 1, 2, ..., 9, and the corresponding dielectric loss tanδ is obtained respectively. i , that is, the test result at 0.001Hz is recorded as tanδ0, the test result at 0.002Hz is recorded as tanδ1, ..., the test result at 1Hz is recorded as tanδ9, and the test data is saved and transmitted to the computer (24) to continue the evaluation;

[0041] Step 3: Influence factor θ at characteristic frequency point i The pursuit of

[0042] Substitute tanδ0, tanδ1, …, tanδ9 into the following formulas to estimate the influence factors θ0, θ1, …, θ9 of the post insulators under the damp and hot environment:

[0043] θ i =0.2545 (i+1) *tanδ i +0.1093*(i+1) (1)

[0044] Where i = 0, 1, 2, ..., 9, tanδ i For different test frequency points f i The corresponding dielectric loss value, θ i The supporting insulator has different characteristic frequencies f iThe influence factor at this point, without considering the influence of the external environmental temperature, only record the temperature T inside the plexiglass test chamber (25) during the test, and T = T0;

[0045] Step 4: Aging state proportion index μ i Estimation

[0046] Based on the influence factor θ obtained in the previous step i Value, substitute θ0, θ1, …, θ9 into the estimation formula respectively, and obtain the aging state proportion indexes μ0, μ1, …, μ9;

[0047]

[0048] Step 5: Calculate the aging state characteristic parameters of the post insulator

[0049] Based on the humidity ρ w0 And the dielectric loss values tanδ0, tanδ1, …, tanδ9 and the aging state proportion indexes μ0, μ1, …, μ9 of the post insulator at different frequency points under the temperature T0, calculate the aging state characteristic parameter J of the post insulator. The calculation formula is as follows:

[0050]

[0051] Step 6: Evaluate the aging state of the post insulator to be tested

[0052] According to the content in the above steps, continue to set the thresholds J1 and J2 as the judgment basis, and make the following judgments.

[0053] When J < J1, it is judged that the state of the post insulator is good or in a mild aging state and can operate normally;

[0054] When J1 ≤ J < J2, it is judged that the post insulator is in a moderate aging state and needs real-time monitoring;

[0055] When J ≥ J2, it is judged that the post insulator is in a severe aging state, with poor anti-flashover or creepage ability, and needs to be replaced or further tested such as discharge tests.

[0056] Among them, the threshold J1 = 0.35 and J2 = 0.85.

[0057] In addition, the present invention can also achieve the following test functions:

[0058] An intelligent evaluation method for the aging state of post insulators in a humid and hot environment proposed can change the magnitudes of the thresholds J1 and J2 according to the differences in the post insulator manufacturer, operating environment, and material properties, making it more suitable for the intelligent evaluation of the aging state of support insulators in different humid and hot environments.

Claims

1. An intelligent evaluation method for the aging state of a post insulator in a hot and humid environment, characterized in that: The steps include: Step 1: Build a humid and hot environment simulation platform A support insulator humid and hot environment simulation platform is constructed, comprising a humidity adjustment system (1), a first humidifier (2), a second humidifier (3), a rubber umbrella skirt (4), an upper hardware (5), a fastening nut (6), a metal bolt (7), a fourth humidifier (8), a third humidifier (9), a third wireless humid and hot sensor (10), a fourth wireless humid and hot sensor (11), a third resistance wire (12), a fourth resistance wire (13), a high-voltage connecting wire (14), a frequency domain dielectric spectrum tester (15), a low-voltage acquisition wire (16), a low-voltage connecting terminal (17), a supporting metal base (18), a temperature control system (19), a first resistance wire (20), a second resistance wire (21 ), a first wireless humidity and heat sensor (22), a second wireless humidity and heat sensor (23), a computer (24), and an organic glass test box (25); a metal bolt (7) is connected to a high voltage end of a frequency domain dielectric spectrum tester (15) through a fastening nut (6) and a high voltage connecting line (14); a supporting metal base (18) is connected to a low voltage end of a frequency domain dielectric spectrum tester (15) through a low voltage connecting terminal (17) and a low voltage acquisition line (16) tightly clamped thereon; and the frequency domain dielectric spectrum tester (15) transmits test data to the computer (24) through a coaxial cable; a first resistance wire (20), a second resistance wire (21), a third resistance wire (12), and a fourth resistance wire (13) are placed at the bottom of the organic glass test box (25) and are respectively connected to the temperature control system (19), and the temperature control system (19) is connected to the computer (24) through a coaxial cable; the first humidifier (2), the second humidifier (3), the third humidifier (9) and the fourth humidifier (8) are placed on the upper part of the organic glass test box (25) and are respectively connected to the humidity control system (1), and the humidity control system (1) is connected to the computer (24) through a coaxial cable; the first wireless humidity and heat sensor (22), the second wireless humidity and heat sensor (23), the third wireless humidity and heat sensor (10), and the fourth wireless humidity and heat sensor (11) are placed in the organic glass test box (25) The computer (24) sends instructions to the humidity control system (1) and the temperature control system (19) through the data detected by the first wireless humidity sensor (22), the second wireless humidity sensor (23), the third wireless humidity sensor (10), and the fourth wireless humidity sensor (11), and controls the first humidifier (2), the second humidifier (3), the third humidifier (9), the fourth humidifier (8) or the first resistance wire (20), the second resistance wire (21), the third resistance wire (12), and the fourth resistance wire (13) connected thereto through the humidity control system (1) and the temperature control system (19); Step 2: Turn on the humidity adjustment system (1) and the temperature control system (19), and set different target values ​​ρ for the first humidifier (2), the second humidifier (3), the third humidifier (9), the fourth humidifier (8) or the first resistance wire (20), the second resistance wire (21), the third resistance wire (12), and the fourth resistance wire (13) respectively. w0 At T0, the system starts to work, and at the same time, the first wireless humidity and heat sensor (22), the second wireless humidity and heat sensor (23), the third wireless humidity and heat sensor (10), and the fourth wireless humidity and heat sensor (11) monitor the humidity ρ in the organic glass test box (25) in real time. w and temperature T, and when reaching the preset target value and stabilizing, leaving it to stand for 1 hour to allow the wet and hot environment to be in a balanced state, then starting the frequency domain dielectric spectrum tester (15); Step 3: Use the frequency domain dielectric spectrum tester (15) to test the post insulator under humidity ρ w0 The dielectric loss value tanδ at multiple frequency points under temperature T0, the test frequency point f i They are 0.001Hz, 0.002Hz, 0.005Hz, 0.01Hz, 0.02Hz, 0.05Hz, 0.1Hz, 0.2Hz, 0.5Hz, 1Hz, where i = 0, 1, 2, ..., 9, and the corresponding dielectric loss tanδ is obtained respectively. i , that is, the test result at 0.001Hz is recorded as tanδ0, the test result at 0.002Hz is recorded as tanδ1, ..., the test result at 1Hz is recorded as tanδ9, and the test data is saved and transmitted to the computer (24) to continue the evaluation; Step 4: Influence factor θ at characteristic frequency point i The pursuit of Substitute tanδ0, tanδ1, …, tanδ9 into the following formulas to estimate the influence factors θ0, θ1, …, θ9 of the post insulator in this humid and hot environment: i i =0.2545 (i+1) *tanδ i +0.1093*(i+1) (1) Where i = 0, 1, 2, ..., 9, tanδ i For different test frequency points f i The corresponding dielectric loss value, θ i The supporting insulator has different characteristic frequencies f i The influence factor at the position is not considered here, and only the temperature T in the organic glass test box (25) during the test is recorded, and T=T0; Step 5: Aging state ratio index μ i Estimate Based on the influence factor θ obtained in the fourth step i Numerical values, substitute θ0, θ1, …, θ9 into the estimation formula to obtain the aging state proportional index μ0, μ1, …, μ9; Step 6: Calculate the characteristic parameters of the aging state of the post insulator Based on humidity ρ w0 The dielectric loss values ​​tanδ0, tanδ1, ..., tanδ9 and aging state proportional index μ0, μ1, ..., μ9 of the post insulator at different frequency points under temperature T0 are used to calculate the aging state characteristic parameter J of the post insulator. The calculation formula is as follows: Step 7: Evaluate the aging state of the post insulator to be measured According to the content of the first to sixth steps described above, continue to set the thresholds J1 and J2 used as the judgment basis, and make the following judgments When J < J1, it is judged that the state of the post insulator is good or in a slightly aging state, and it can operate normally When J1 ≤ J < J2, it is judged that the post insulator is in a moderately aging state and needs to be monitored in real time When J ≥ J2, it is judged that the post insulator is in a severely aging state, with poor anti-flashover or creepage ability, and needs to be replaced or further tested by a discharge test 2. For an intelligent evaluation method for the aging state of a post insulator in a humid and hot environment as described in claim 1, the magnitudes of the thresholds J1 and J2 can be changed according to the differences in the post insulator manufacturer, operating environment, and material properties, so as to make it more suitable for the intelligent evaluation of the aging state of the support insulator in different humid and hot environments

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