Composite insulator service state evaluation platform and method considering extreme high temperature

Abstract

The invention discloses a composite insulator service state evaluation platform and method considering extreme high temperature. The method comprises the following steps: firstly, constructing a composite insulator service state evaluation test platform under the extreme high temperature; according to the test requirements, the environment temperature in the environment simulation box is stably controlled through the test platform, and the actual working test current measurement test of the composite insulator is carried out at the stable environment temperature. A wireless data transmitter collects the actual working test voltage measured by the high-voltage divider and the actual working test current measured by the current test sensor, and transmits the actual working test voltage and the actual working test current to an upper computer; the environment simulation test box is controlled to be at different environment temperatures through the platform, composite insulator service state evaluation tests at different environment temperatures are carried out, a composite insulator service state reference evaluation factor is obtained in combination with a set temperature value, and the composite insulator service state is evaluated. The method has the advantage that the service state of the composite insulator is accurately evaluated.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite insulator service status assessment, and in particular to a composite insulator service status assessment platform and method taking into account extremely high temperatures. Background Art

[0002] With the continuous development of the power system and the higher requirements of the new power grid for power stability, the evaluation of the service status of composite insulators, which are important insulation equipment for transmission lines, is becoming more and more important during use. As the insulation equipment connecting the conductor and the tower support in the line, the composite insulator is subjected to the long-term operation voltage of the conductor, and the insulation tolerance characteristics are constantly deteriorating, and the service status is also declining. In severe cases, short-circuit accidents may even occur. In addition, since the composite insulator lacks the zero-value self-explosion characteristics of the glass insulator, its service status cannot be intuitively expressed. Therefore, the evaluation of the service status of the composite insulator is of great significance.

[0003] There are relatively few evaluations of the service status of composite insulators at present, and there is no practical test evaluation platform and evaluation method. When evaluating the service status of composite insulators, the extraction of evaluation parameters is often affected by the ambient temperature, especially under extremely high temperatures. However, there is currently a lack of consideration for related situations. Therefore, in order to accurately evaluate the service status of composite insulators, there is an urgent need for a composite insulator service status evaluation method that takes into account extreme high temperatures, so as to accurately evaluate the service status of composite insulators and improve the operational safety of transmission lines. Summary of the invention

[0004] The purpose of the present invention is to provide a composite insulator service status assessment platform and method taking into account extreme high temperatures in order to solve the above-mentioned deficiencies.

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

[0006] A composite insulator service status assessment platform taking into account extreme high temperatures, comprising a host computer, a grounding grid, a high-voltage switch, a temperature sensor 1, a temperature sensor 2, a high-temperature generator 1, a high-temperature generator 2, a high-voltage cable 1, a high-voltage cable 2, a high-voltage cable 3, an environmental simulation test box, a high-voltage voltage divider, a high-voltage generator, a composite insulator, a high-temperature generator control device, a wireless data transmitter, a grounding electrode 1, a grounding electrode 2, a grounding electrode 3, a wireless data receiver, a high-voltage test electrode 1, a high-voltage test electrode 2, a data collector, a signal cable 1, a signal cable 2, and a current test sensor;

[0007] Wherein: the signal input end of the high-voltage generator is connected to the host computer, the output end of the high-voltage generator is connected to the voltage divider through the high-voltage cable three, the high-voltage voltage divider is connected to the input end of the high-voltage switch through the high-voltage cable one, the output end of the high-voltage switch is connected to the high-voltage test electrode one, the high-voltage test electrode one is connected to the upper end of the composite insulator, the lower end of the composite insulator is connected to the high-voltage test electrode two, and the high-voltage test electrode two is connected to the grounding grid through the high-voltage cable two;

[0008] The grounding end of the high-voltage generator is connected to grounding electrode 1, the grounding end of the high-voltage voltage divider is connected to grounding electrode 2, the grounding end of the environmental simulation test box is connected to grounding electrode 3, the signal output end of the high-voltage voltage divider is connected to the wireless data transmitter through signal cable 1, the current test sensor is installed on the high-voltage cable 2 of the connecting line between the composite insulator and the grounding network, the current test sensor is connected to the wireless data transmitter through signal cable 2, the wireless data transmitter communicates with the wireless data receiver through radio, and the wireless data receiver is connected to the host computer;

[0009] The output end of the high temperature generator control device is connected to the high temperature generator 1 and the high temperature generator 2, and the input end of the high temperature generator control device is connected to the host computer;

[0010] The temperature sensor 1 and the temperature sensor 2 are connected to a data collector, and the data collector is connected to a host computer;

[0011] The composite insulator, current test sensor, temperature sensor 1, temperature sensor 2, high temperature generating device 1, high temperature generating device 2, high voltage switch, high voltage test electrode 1, and high voltage test electrode 2 are placed in an environmental simulation test box.

[0012] The evaluation method of the above evaluation platform comprises the following steps:

[0013] S1: Set the ambient temperature in the environmental simulation test box to T to simulate the high-temperature working environment of the composite insulator, turn on the high-temperature generator 1 and the high-temperature generator 2 to change the ambient temperature in the environmental simulation test box, and test the ambient temperature in the environmental simulation test box through the temperature sensor 1 and the temperature sensor 2. After reaching the set temperature T, control the high-voltage generator to output a set high voltage with an amplitude of U through the host computer, adjust the high-voltage switch to turn on the high-voltage switch, measure the actual working test voltage U0 of the composite insulator through the voltage divider and transmit it to the host computer, measure the current generated by the composite insulator under the high voltage U0 through the current test sensor, and transmit it to the host computer through the wireless data transmitter, and adjust the high-voltage switch to turn off the high-voltage switch;

[0014] S2: Define the severe high - temperature environment as: 55°C < T ≤ 100°C, where T is the ambient temperature. Starting from T = 55°C, take a temperature every interval of T0, and repeat step S1. Use the current - test sensor to measure the different actual working test current values at each temperature, obtaining a total of m groups of test data;

[0015] S3: Substitute the measured ambient temperature and the basic parameters of the composite insulator into formula (1) to obtain m groups of reference evaluation factors Q for the service status of the composite insulator 1K :

[0016]

[0017] In the formula, Q 1K is the reference evaluation factor for the service status of the composite insulator in the K - th group of tests, T K is the ambient temperature set in the K - th group of tests, U1 is the rated voltage of the composite insulator, h1 is the structural height of the composite insulator, h2 is the minimum nominal creepage distance of the composite insulator, h is the error coefficient, η is the integration variable, and m is the number of tests;

[0018] S4: Use an optimization algorithm to optimize and model formula (1) to obtain the value of h0 that minimizes the error. The specific steps are as follows:

[0019] 1) Randomly generate an initial solution h and calculate the objective function f(h):

[0020]

[0021] In the formula, f(h) represents the objective function, U 0K is the actual working test voltage measured in the K - th group of tests, and I 0K is the actual working test current value measured in the K - th group of tests;

[0022] 2) Generate a perturbed new solution h' and calculate the objective - function difference Δf = f(h)-f(h'); if Δf ≥ 0, accept the new solution; otherwise, obtain the new solution according to the probability - acceptance criterion;

[0023] 3) Determine whether the iteration times have been reached. If so, go to the fourth step; otherwise, go to the second step;

[0024] 4) Determine whether the termination condition is satisfied. If so, end the operation and return the optimal solution; otherwise, reset the iteration times and go to the second step;

[0025] S5: Substitute the optimal value h0 obtained from the optimization in step S4 into formula (1) to obtain the calculation formula for the optimized reference evaluation factor of the working characteristics of the composite insulator:

[0026]

[0027] In the formula, Q0K is the optimized benchmark evaluation factor for the service status of composite insulators under the Kth group test, and h0 is the optimized error coefficient;

[0028] S6: Based on the above calculations, the service condition assessment factor Q of the composite insulator considering extreme high temperature is obtained:

[0029]

[0030] Where P K is the baseline weight factor for the Kth group of tests;

[0031] S7: Based on the above steps, when Q∈(0, 250*10 6 ], it indicates that the composite insulator has failed in its working characteristics and should be replaced as soon as possible; when Q∈(250*10 6 , 300*10 6 ), it indicates that the working characteristics of the composite insulator are poor, and timely maintenance can be arranged; when Q∈(250*10 6 , +∞), which indicates that the working characteristics of the composite insulator are good.

[0032] The beneficial effect of the present invention is that it controls the ambient temperature of the composite insulator and tests the actual working test voltage value and the actual working test current value of the composite insulator under extremely high temperature, which can effectively simulate the extreme high temperature conditions of the composite insulator under actual working conditions. The high temperature generator control device can realize the precise control of the extreme high temperature in the environmental simulation box, which is beneficial to improve the accuracy of the composite insulator service characteristics evaluation test and analyze the correlation between extreme high temperature and working test current. The composite insulator service characteristics evaluation factor takes into account the impact of extreme high temperature on the composite insulator service characteristics evaluation, further improving the accuracy of the composite insulator service characteristics evaluation; the test device is easy to operate, safe and reliable, and the test device can be used for tests under different ambient temperatures, and has universal applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 is a flow chart of the evaluation method in the invention; DETAILED DESCRIPTION

[0035] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0036] An evaluation platform for the service status of composite insulators taking into account extremely high temperatures:

[0037] like Figure 1The test platform of the present invention comprises: a host computer (01), a grounding network (02), a high-voltage switch (03), a temperature sensor 1 (04a), a temperature sensor 2 (04b), a high-temperature generator 1 (05a), a high-temperature generator 2 (05b), a high-voltage cable 1 (06a), a high-voltage cable 2 (06b), a high-voltage cable 3 (06c), an environmental simulation test box (08), a high-voltage voltage divider (09), a high-voltage generator (10), a composite insulator (11), a high-temperature generator control device (12), a wireless data transmitter (13), a grounding electrode 1 (14a), a grounding electrode 2 (14b), a grounding electrode 3 (14c), a wireless data receiver (15), a high-voltage test electrode 1 (16a), a high-voltage test electrode 2 (16b), a data acquisition device (17), a signal cable 1 (18a), a signal cable 2 (18b), and a current test sensor (19);

[0038] Wherein: the signal input end of the high-voltage generator (10) is connected to the host computer (01), the output end of the high-voltage generator (10) is connected to the voltage divider (09) through the high-voltage cable three (06c), the high-voltage voltage divider (09) is connected to the input end of the high-voltage switch (03) through the high-voltage cable one (06a), the output end of the high-voltage switch (03) is connected to the high-voltage test electrode one (16a), the high-voltage test electrode one (16a) is connected to the upper end of the composite insulator (11), the lower end of the composite insulator (11) is connected to the high-voltage test electrode two (16b), and the high-voltage test electrode two (16b) is connected to the grounding grid (02) through the high-voltage cable two (06b);

[0039] The grounding end of the high-voltage generator (10) is connected to grounding electrode 1 (14a), the grounding end of the high-voltage voltage divider (09) is connected to grounding electrode 2 (14b), the grounding end of the environmental simulation test box (08) is connected to grounding electrode 3 (14c), the signal output end of the high-voltage voltage divider (09) is connected to the wireless data transmitter (13) through a signal cable 1 (18a), the current test sensor (19) is installed on a high-voltage cable 2 (06b) which is a connecting line between the composite insulator (11) and the grounding grid (02), the current test sensor (19) is connected to the wireless data transmitter (13) through a signal cable 2 (18b), the wireless data transmitter (13) communicates with the wireless data receiver (15) through radio, and the wireless data receiver (15) is connected to the host computer (01);

[0040] The output end of the high temperature generator control device (12) is connected to the high temperature generator one (05a) and the high temperature generator two (05b), and the input end of the high temperature generator control device (12) is connected to the host computer (01);

[0041] The temperature sensor 1 (04a) and the temperature sensor 2 (04b) are connected to a data collector (17), and the data collector (17) is connected to a host computer (01).

[0042] The composite insulator (11), the current test sensor (19), the temperature sensor 1 (04a), the temperature sensor 2 (04b), the high-temperature generating device 1 (05a), the high-temperature generating device 2 (05b), the high-voltage switch (03), the high-voltage test electrode 1 (16a), and the high-voltage test electrode 2 (16b) are placed inside an environmental simulation test chamber (08).

[0043] A method for evaluating the service status of a composite insulator considering extreme high temperatures includes the following steps:

[0044] S1: Set the environmental temperature inside the environmental simulation test chamber (08) to T to simulate the high-temperature working environment of the composite insulator. Turn on the high-temperature generating device 1 (05a) and the high-temperature generating device 2 (05b) to change the environmental temperature inside the environmental simulation test chamber (08). After the environmental temperature inside the environmental simulation test chamber (08) reaches the set temperature T as measured by the temperature sensor 1 (04a) and the temperature sensor 2 (04b), control the high-voltage generator (10) through the host computer (01) to output a set high voltage with an amplitude of U. Adjust the high-voltage switch (03) to turn it on. Measure the actual working test voltage U0 of the composite insulator (11) through the voltage divider (09) and transmit it to the host computer (01). Measure the current generated by the composite insulator (09) under the high voltage U0 through the current test sensor (19) and transmit it to the host computer (01) through the wireless data transmitter (13). Adjust the high-voltage switch (03) to turn it off.

[0045] S2: Define the severe high-temperature environment as: 55°C < T ≤ 100°C, where T is the environmental temperature. Starting from T = 55°C, take a temperature every interval T0 and repeat step S1. Use the current test sensor (19) to measure different actual working test current values at each temperature, obtaining a total of m sets of test data.

[0046] S3: Substitute the measured environmental temperature and the basic parameters of the composite insulator into formula (5) to obtain m sets of reference evaluation factors Q for the service status of the composite insulator. 1K :

[0047]

[0048] In the formula, Q 1K is the reference evaluation factor for the service status of the composite insulator in the Kth group of tests, and T Kis the ambient temperature set for the Kth group test, U1 is the rated voltage of the composite insulator, h1 is the structural height of the composite insulator, h2 is the minimum nominal creepage distance of the composite insulator, h is the error coefficient, η is the integral variable, and m is the number of tests;

[0049] S4: Use the optimization algorithm to optimize the formula (5) and obtain the h0 value that minimizes the error. The specific steps are:

[0050] 1) Randomly generate an initial solution h and calculate the objective function f(h):

[0051]

[0052] Where f(h) represents the objective function, U 0K The actual working test voltage measured in the K group test, I 0K The actual working test current value measured for group K test;

[0053] 2) Generate a new perturbed solution h' and calculate the objective function Δf = f(h) - f(h'); if Δf ≥ 0, accept the new solution; otherwise, obtain the new solution according to the probability acceptance criterion;

[0054] 3) Determine whether the number of iterations has been reached. If so, go to step 4; otherwise, go to step 2.

[0055] 4) Determine whether the termination condition is met. If so, the operation ends and the optimal solution is returned. Otherwise, the number of iterations is reset and the second step is performed.

[0056] S5: Substitute the optimal value h0 obtained by optimization in step S4 into formula (5) to obtain the calculation formula of the optimized composite insulator working characteristic benchmark evaluation factor:

[0057]

[0058] In the formula, Q 0K is the optimized benchmark evaluation factor for the service status of composite insulators under the Kth group test, and h0 is the optimized error coefficient;

[0059] S6: Based on the above calculations, the service condition assessment factor Q of the composite insulator considering extreme high temperature is obtained:

[0060]

[0061] Where P K is the baseline weight factor for the Kth group of tests;

[0062] S7: Based on the above steps, when Q∈(0, 250*10 6 ], it indicates that the composite insulator has failed in its working characteristics and should be replaced as soon as possible; when Q∈(250*106 , 300*10 6 ), it indicates that the working characteristics of the composite insulator are poor, and timely maintenance can be arranged; when Q∈(250*10 6 , +∞), which indicates that the working characteristics of the composite insulator are good.

Claims

1. A composite insulator service status assessment platform taking into account extreme high temperatures, characterized in that: It includes a host computer (01), a grounding network (02), a high-voltage switch (03), a temperature sensor 1 (04a), a temperature sensor 2 (04b), a high-temperature generator 1 (05a), a high-temperature generator 2 (05b), a high-voltage cable 1 (06a), a high-voltage cable 2 (06b), a high-voltage cable 3 (06c), an environmental simulation test box (08), a high-voltage voltage divider (09), a high-voltage generator (10), a composite insulator (11), a high-temperature generator control device (12), a wireless data transmitter (13), a grounding electrode 1 (14a), a grounding electrode 2 (14b), a grounding electrode 3 (14c), a wireless data receiver (15), a high-voltage test electrode 1 (16a), a high-voltage test electrode 2 (16b), a data acquisition device (17), a signal cable 1 (18a), a signal cable 2 (18b), and a current test sensor (19); Wherein: the signal input end of the high-voltage generator (10) is connected to the host computer (01), the output end of the high-voltage generator (10) is connected to the voltage divider (09) through the high-voltage cable three (06c), the high-voltage voltage divider (09) is connected to the input end of the high-voltage switch (03) through the high-voltage cable one (06a), the output end of the high-voltage switch (03) is connected to the high-voltage test electrode one (16a), the high-voltage test electrode one (16a) is connected to the upper end of the composite insulator (11), the lower end of the composite insulator (11) is connected to the high-voltage test electrode two (16b), and the high-voltage test electrode two (16b) is connected to the grounding grid (02) through the high-voltage cable two (06b); The grounding end of the high-voltage generator (10) is connected to grounding electrode 1 (14a), the grounding end of the high-voltage voltage divider (09) is connected to grounding electrode 2 (14b), the grounding end of the environmental simulation test box (08) is connected to grounding electrode 3 (14c), the signal output end of the high-voltage voltage divider (09) is connected to the wireless data transmitter (13) through a signal cable 1 (18a), the current test sensor (19) is installed on a high-voltage cable 2 (06b) which is a connecting line between the composite insulator (11) and the grounding grid (02), the current test sensor (19) is connected to the wireless data transmitter (13) through a signal cable 2 (18b), the wireless data transmitter (13) communicates with the wireless data receiver (15) through radio, and the wireless data receiver (15) is connected to the host computer (01); The output end of the high temperature generator control device (12) is connected to the high temperature generator one (05a) and the high temperature generator two (05b), and the input end of the high temperature generator control device (12) is connected to the host computer (01); The temperature sensor 1 (04a) and the temperature sensor 2 (04b) are connected to the data collector (17), and the data collector (17) is connected to the host computer (01); The composite insulator (11), current test sensor (19), first temperature sensor (04a), second temperature sensor (04b), first high-temperature generating device (05a), second high-temperature generating device (05b), high-voltage switch (03), first high-voltage test electrode (16a), and second high-voltage test electrode (16b) are placed inside the environmental simulation test chamber (08).

2. A method for evaluating the service state of a composite insulator considering extreme high temperatures according to claim 1, comprising the following steps: S1: Set the environmental temperature inside the environmental simulation test chamber (08) to T to simulate the high-temperature working environment of the composite insulator. Turn on the first high-temperature generating device (05a) and the second high-temperature generating device (05b) to change the environmental temperature inside the environmental simulation test chamber (08). After the environmental temperature inside the environmental simulation test chamber (08) reaches the set temperature T as measured by the first temperature sensor (04a) and the second temperature sensor (04b), control the high-voltage generator (10) by the upper computer (01) to output a set high voltage with an amplitude of U. Adjust the high-voltage switch (03) to turn on the high-voltage switch (03). Measure the actual working test voltage U0 of the composite insulator (11) through the voltage divider (09) and transmit it to the upper computer (01). Measure the current generated by the composite insulator (09) under the high voltage U0 through the current test sensor (19) and transmit it to the upper computer (01) through the wireless data transmitter (13). Adjust the high-voltage switch (03) to turn off the high-voltage switch (03); S2: Define the severe high-temperature environment as: 55°C < T ≤ 100°C, where T is the environmental temperature. Starting from T = 55°C, take a temperature every interval T0 and repeat step S1. Use the current test sensor (19) to measure different actual working test current values at each temperature, for a total of m sets of test data; S3: Substitute the measured ambient temperature and basic parameters of composite insulators into formula (1) to obtain the service status benchmark evaluation factor Q of group m composite insulators 1K : In the formula, Q 1K is the service status benchmark assessment factor of the composite insulator in Group K test, T K is the ambient temperature set for the Kth group test, U1 is the rated voltage of the composite insulator, h1 is the structural height of the composite insulator, h2 is the minimum nominal creepage distance of the composite insulator, h is the error coefficient, η is the integral variable, and m is the number of tests; S4: Use an optimization algorithm to optimize and model formula (1) to obtain the h0 value that minimizes the error. The specific steps are as follows: 1) Randomly generate an initial solution h and calculate the objective function f(h): Where f(h) represents the objective function, U 0K The actual working test voltage measured in the K group test, I 0K The actual working test current value measured for group K test; 2) Generate a perturbed new solution h' and calculate the objective function Δf = f(h) - f(h'); if Δf ≥ 0, accept the new solution; otherwise, obtain the new solution according to the probability acceptance criterion; 3) Determine whether the iteration number has been reached. If it has, go to the fourth step; otherwise, go back to the second step; 4) Determine whether the termination condition is satisfied. If it is satisfied, end the operation and return the optimal solution; otherwise, reset the iteration number and go back to the second step; S5: Substitute the optimal value h0 obtained by optimizing in step S4 into formula (1) to obtain the calculation formula for the optimized working characteristic reference evaluation factor of the composite insulator: In the formula, Q 0K is the optimized benchmark evaluation factor for the service status of composite insulators under the Kth group test, and h0 is the optimized error coefficient; S6: Based on the above calculations, obtain the service state evaluation factor Q of the composite insulator considering extreme high temperatures: Where P K is the baseline weight factor for the Kth group of tests; S7: Based on the above steps, when Q∈(0, 250*10 6 ], it indicates that the composite insulator has failed in its working characteristics and should be replaced as soon as possible; when Q∈(250*10 6 , 300*10 6 ), it indicates that the working characteristics of the composite insulator are poor, and timely maintenance can be arranged; when Q∈(250*10 6 , +∞), which indicates that the working characteristics of the composite insulator are good.

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