Composite insulator working characteristic evaluation platform and method considering environment humidity

Abstract

The invention discloses a composite insulator working characteristic evaluation platform and method considering environment humidity. The method comprises the following steps: firstly, constructing a test platform for evaluating working characteristics of composite insulators with different relative humidity; according to the test requirements, the relative humidity of the test box is stably controlled through the test platform, and the feedback current measurement test of the working test of the composite insulator is carried out under the stable relative humidity. A data collector collects actual working test voltage measured by a voltage divider and working test feedback current signals measured by a working test current feedback sensor, and transmits the actual working test voltage and the working test feedback current signals to a host; the test box is controlled to have different relative humidity through the platform, the evaluation test of the working characteristics of the composite insulator under different relative humidity is carried out, the evaluation factors of the working characteristics of the composite insulator are obtained in combination with the set relative humidity value, and the working characteristics of the composite insulator are evaluated. According to the method, the influence of the environment humidity on the feedback current measurement of the working test of the composite insulator is considered, and the working characteristics of the composite insulator are accurately evaluated.

Description

Technical Field

[0001] The present invention belongs to the field of composite insulator working characteristic evaluation, and in particular to a composite insulator working characteristic evaluation platform and method taking environmental humidity into consideration. Background Art

[0002] With the continuous expansion of the scale of power grid, there are higher requirements for the stability and safety of power system network operation. Insulators are the main insulating equipment in transmission lines, especially composite insulators, which are widely used due to their excellent insulator characteristics and pollution resistance. The evaluation of their working characteristics during use is also very important. Composite insulators are devices installed between conductors of different potentials or between conductors and grounding components, which can withstand voltage and mechanical stress. However, since composite insulators operate under the working voltage of line conductors for a long time, the temperature rise generated inside will accelerate the aging of insulators and destroy their working characteristics. At the same time, changes in temperature and humidity differences in the external environment, mechanical external forces, and environmental corrosion will also cause damage to composite insulators, thereby reducing the working characteristics of insulators. In severe cases, short-circuit faults occur, thereby losing the insulation function. In addition, since composite insulators lack the zero-value self-explosion characteristics of glass insulators, their working characteristics cannot be intuitively expressed. Therefore, the evaluation of the working characteristics of composite insulators is of great significance.

[0003] The evaluation of the working characteristics of composite insulators usually measures the test current of the composite insulators under the working voltage, compares the obtained test current with the operating procedure data, and obtains the working characteristics of the composite insulators. However, since the working test feedback current of the composite insulator will be affected by the humidity in the environment, different humidity gradients will cause significant differences in the working test feedback current measured for the same composite insulator. At the same time, the current evaluation of the working characteristics of composite insulators does not consider the impact of ambient humidity on the evaluation results of the working characteristics of composite insulators. Therefore, in order to accurately analyze the working characteristics of composite insulators, there is an urgent need for a composite insulator working characteristics evaluation platform and method that takes into account ambient humidity to accurately evaluate the working characteristics of composite insulators and provide safe operation of the power system. Summary of the invention

[0004] The object of the present invention is to provide a composite insulator working characteristic evaluation platform and method taking into account the ambient humidity.

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

[0006] A composite insulator working characteristic evaluation platform considering environmental humidity includes a host, a working test voltage generation controller, a working test voltage generator, a voltage divider, a grounding electrode 1, a grounding electrode 2, a grounding electrode 3, a grounding device, a data collector 1, a data collector 2, a control switch, a composite insulator, a working test current feedback sensor, a test box, a relative humidity generation control device, a relative humidity generation device, a high-voltage cable, a relative humidity sensor 1, a relative humidity sensor 2, and a relative humidity sensor 3;

[0007] Wherein: the signal input end of the working test voltage generator is connected to the working test voltage generation controller, the working test voltage generation controller is connected to the host, the output end of the working test voltage generator is connected to the voltage divider through a high-voltage cable, the voltage divider is connected to the input end of the control switch through the high-voltage cable, the output end of the control switch is connected to the upper end of the composite insulator, and the lower end of the composite insulator is connected to the grounding device;

[0008] The grounding end of the working test voltage generator is connected to grounding electrode 1, the grounding end of the voltage divider is connected to grounding electrode 2, the grounding end of the test box is connected to grounding electrode 3, the signal output end of the voltage divider is connected to data collector 1, the working test current feedback sensor is installed on the connecting line between the insulator and the grounding device, the working test current feedback sensor is connected to data collector 1, and data collector 1 is connected to the host;

[0009] The output end of the relative humidity generating control device is connected to the relative humidity generating device, and the input end of the relative humidity generating control device is connected to the host;

[0010] The relative humidity sensor 1, relative humidity sensor 2 and relative humidity sensor 3 are connected to the data collector 2, and the data collector 2 is connected to the host;

[0011] The composite insulator, the working test current feedback sensor, the first relative humidity sensor, the second relative humidity sensor, the third relative humidity sensor, the relative humidity generating device, and the control switch are placed in the test box.

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

[0013] Step 1: Measure the feedback current of composite insulator working test under different relative humidity:

[0014] The relative humidity H in the test box is tested by relative humidity sensor 1, relative humidity sensor 2 and relative humidity sensor 3, and transmitted to the host through data acquisition device 2; the host controls the working test voltage generation controller to set the working test voltage generator to output an amplitude of U working test voltage, adjust the control switch to turn on the control switch, measure the actual working test voltage U1 of the composite insulator through the voltage divider and transmit it to the host through data acquisition device 1, measure the working test feedback current I generated by the composite insulator under the working test voltage through the working test current feedback sensor, and transmit it to the host through data acquisition device 1; adjust the control switch to turn off the control switch, change the relative humidity in the test box through the relative humidity generating device, so that the relative humidity in the test box is between 0% and 100%, repeat the above test steps, and obtain m groups of corresponding relative humidity, actual working test voltage U1 and working test feedback current I data;

[0015] Step 2: Calculate the first-level evaluation factor of the composite insulator working characteristics:

[0016] Substitute the obtained m groups of actual working test voltage and working test feedback current data into formula (1) to obtain the first-level evaluation factor Y of the working characteristics of the m groups of composite insulators: 1K :

[0017] Y 1K =exp(-39.8IK)+exp(0.61U1K)-12.399sin(-1.88IK),K=1,2,3,...,m (1)

[0018] Y 1K —First-level evaluation factor of working characteristics of composite insulators in group K test, I K —Working test feedback current data measured in group K test, U 1K —actual working test voltage measured in the Kth group test, m—number of tests;

[0019] Step 3: Calculate the secondary evaluation factors of composite insulator working characteristics:

[0020] Substituting the measured relative humidity and the actual working test voltage into formula (2), the secondary evaluation factor Y of the working characteristics of group m composite insulators is obtained: 2K ;

[0021]

[0022] Y 2K —Secondary evaluation factor of working characteristics of composite insulators in group K test, H K — relative humidity measured in group K test;

[0023] Based on the above calculations, the evaluation factor Y of the working characteristics of composite insulators under the influence of environmental humidity is:

[0024]

[0025] Y—factors for evaluating the working characteristics of composite insulators, Q1—standard weighting factor one, Q2—standard weighting factor two, Q3—standard weighting factor three, Q4—standard weighting factor four;

[0026] When Y∈(0,0.3], it indicates that the working characteristics of the composite insulator are good; when Y∈(0.3,0.5], it indicates that the working characteristics of the composite insulator are poor and timely maintenance can be arranged; when Y∈(0.5,1.0]), it indicates that the working characteristics of the composite insulator are seriously deteriorated and maintenance should be arranged as soon as possible; when Y∈(1.0,+∞], it indicates that the working characteristics of the composite insulator fail and it should be replaced as soon as possible.

[0027] The beneficial effects of the present invention are:

[0028] 1. Controlling the ambient humidity of the composite insulator and measuring the working test feedback current of the composite insulator under different relative humidity can effectively simulate the ambient humidity conditions of the composite insulator under actual working conditions.

[0029] 2. The relative humidity generation control device can realize precise control of relative humidity, which is beneficial to improve the accuracy of composite insulator working characteristic evaluation test and analyze the correlation between ambient humidity and working test feedback current.

[0030] 3. The composite insulator working characteristics evaluation factor takes into account the impact of ambient humidity on the composite insulator working characteristics evaluation, further improving the accuracy of the composite insulator working characteristics evaluation.

[0031] 4. The test device is easy to operate, safe and reliable. It can carry out tests under different relative humidity and is universal. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the evaluation platform of the present invention;

[0033] Figure 2 It is a flow chart of the evaluation method in the invention. DETAILED DESCRIPTION

[0034] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0035] A composite insulator working characteristic evaluation platform and method considering ambient humidity, the specific implementation method includes the following steps:

[0036] Step 1: Build a composite insulator working characteristics evaluation platform considering environmental humidity:

[0037] like Figure 1 As shown, the test platform of the present invention includes: a host 01, a working test voltage generation controller 02, a working test voltage generator 03, a voltage divider 04, a grounding electrode 1 05a, a grounding electrode 2 05b, a grounding electrode 3 05c, a grounding device 06, a data collector 1 07a, a data collector 2 07b, a control switch 08, a composite insulator 09, a working test current feedback sensor 10, a test box 11, a relative humidity generation control device 12, a relative humidity generation device 13, a high-voltage cable 14, a relative humidity sensor 1 15a, a relative humidity sensor 2 15b, and a relative humidity sensor 3 15c;

[0038] Wherein: the signal input end of the working test voltage generator 03 is connected to the working test voltage generation controller 02, the working test voltage generation controller 02 is connected to the host 01, the output end of the working test voltage generator 03 is connected to the voltage divider 04 through the high-voltage cable 14, the voltage divider 04 is connected to the input end of the control switch 08 through the high-voltage cable 14, the output end of the control switch 08 is connected to the upper end of the composite insulator 09, and the lower end of the composite insulator 09 is connected to the grounding device 06;

[0039] The grounding end of the working test voltage generator 03 is connected to the grounding electrode 1 05a, the grounding end of the voltage divider 04 is connected to the grounding electrode 2 05b, the grounding end of the test box 11 is connected to the grounding electrode 3 05c, the signal output end of the voltage divider 04 is connected to the data collector 1 07a, the working test current feedback sensor 10 is installed on the connection line between the insulator 09 and the grounding device 06, the working test current feedback sensor 10 is connected to the data collector 1 07a, and the data collector 1 07a is connected to the host 01;

[0040] The output end of the relative humidity generating control device 12 is connected to the relative humidity generating device 13, and the input end of the relative humidity generating control device 12 is connected to the host 01;

[0041] The relative humidity sensor 1 15a, relative humidity sensor 2 15b, relative humidity sensor 3 15c are connected to the data collector 2 07b, and the data collector 2 07b is connected to the host 01;

[0042] The composite insulator 09 , the working test current feedback sensor 10 , the relative humidity sensor 1 15 a , the relative humidity sensor 2 15 b , the relative humidity sensor 1 15 c , the relative humidity generating device 13 , and the control switch 08 are placed in the test box 11 .

[0043] Step 2: Measure the feedback current of composite insulator working test under different relative humidity

[0044] The relative humidity H in the test box 11 is tested by relative humidity sensor 15a, relative humidity sensor 2 15b, and relative humidity sensor 3 15c, and transmitted to the host 01 by data acquisition device 2 07b; the host 01 controls the working test voltage generation controller 02 to set the working test voltage generator 03 to output the set working test voltage with an amplitude of U; the control switch 08 is adjusted to turn on the control switch 08; the actual working test voltage U1 of the composite insulator is measured by the voltage divider 04 and transmitted to the host 01 by data acquisition device 1 07a; the working test feedback current I generated by the composite insulator 09 under the working test voltage is measured by the working test current feedback sensor 10, and transmitted to the host 01 by data acquisition device 1 07a; the control switch 08 is adjusted to turn off the control switch 08; the relative humidity in the test box 11 is changed by the relative humidity generating device 13, so that the relative humidity in the test box 11 is between 0% and 100%, and the above test steps are repeated to obtain m groups of corresponding relative humidity, actual working test voltage U1 and working test feedback current I data;

[0045] Step 3: Calculate the first-level evaluation factor of the composite insulator working characteristics:

[0046] Substitute the obtained m groups of actual working test voltage and working test feedback current data into formula (4) to obtain the first-level evaluation factor Y of the working characteristics of the m groups of composite insulators: 1K :

[0047] Y 1K =exp(-39.8IK)+exp(0.61U1K)-12.399sin(-1.88IK),K=1,2,3,...,m (4)

[0048] Y 1K —First-level evaluation factor of working characteristics of composite insulators in group K test, I K —Working test feedback current data measured in group K test, U 1K —actual working test voltage measured in the Kth group test, m—number of tests;

[0049] Step 4: Calculate the secondary evaluation factors of composite insulator working characteristics:

[0050] Substituting the measured relative humidity and the actual working test voltage into formula (5), the secondary evaluation factor Y of the working characteristics of group m composite insulators is obtained: 2K ;

[0051]

[0052] Y 2K —Secondary evaluation factor of working characteristics of composite insulators in group K test, H K— relative humidity measured in group K test;

[0053] Based on the above calculations, the evaluation factor Y of the working characteristics of composite insulators under the influence of environmental humidity is:

[0054]

[0055] Y—factors for evaluating the working characteristics of composite insulators, Q1—standard weighting factor one, Q2—standard weighting factor two, Q3—standard weighting factor three, Q4—standard weighting factor four;

[0056] When Y∈(0,0.3], it indicates that the working characteristics of the composite insulator are good; when Y∈(0.3,0.5], it indicates that the working characteristics of the composite insulator are poor and timely maintenance can be arranged; when Y∈(0.5,1.0]), it indicates that the working characteristics of the composite insulator are seriously deteriorated and maintenance should be arranged as soon as possible; when Y∈(1.0,+∞], it indicates that the working characteristics of the composite insulator fail and it should be replaced as soon as possible.

Claims

1. A composite insulator working characteristics evaluation platform considering environmental humidity, characterized in that: It comprises a host (01), a working test voltage generation controller (02), a working test voltage generator (03), a voltage divider (04), a grounding electrode 1 (05a), a grounding electrode 2 (05b), a grounding electrode 3 (05c), a grounding device (06), a data collector 1 (07a), a data collector 2 (07b), a control switch (08), a composite insulator (09), a working test current feedback sensor (10), a test box (11), a relative humidity generation control device (12), a relative humidity generation device (13), a high-voltage cable (14), a relative humidity sensor 1 (15a), a relative humidity sensor 2 (15b), and a relative humidity sensor 3 (15c); Wherein: the signal input end of the working test voltage generator (03) is connected to the working test voltage generation controller (02), the working test voltage generation controller (02) is connected to the host (01), the output end of the working test voltage generator (03) is connected to the voltage divider (04) through the high-voltage cable (14), the voltage divider (04) is connected to the input end of the control switch (08) through the high-voltage cable (14), the output end of the control switch (08) is connected to the upper end of the composite insulator (09), and the lower end of the composite insulator (09) is connected to the grounding device (06); The grounding end of the working test voltage generator (03) is connected to grounding electrode 1 (05a), the grounding end of the voltage divider (04) is connected to grounding electrode 2 (05b), the grounding end of the test box (11) is connected to grounding electrode 3 (05c), the signal output end of the voltage divider (04) is connected to data collector 1 (07a), the working test current feedback sensor (10) is installed on the connection line between the insulator (09) and the grounding device (06), the working test current feedback sensor (10) is connected to data collector 1 (07a), and data collector 1 (07a) is connected to the host (01); The output end of the relative humidity generating control device (12) is connected to the relative humidity generating device (13), and the input end of the relative humidity generating control device (12) is connected to the host (01); The relative humidity sensor 1 (15a), relative humidity sensor 2 (15b), and relative humidity sensor 3 (15c) are connected to the data collector 2 (07b), and the data collector 2 (07b) is connected to the host (01); The composite insulator (09), the working test current feedback sensor (10), the relative humidity sensor 1 (15a), the relative humidity sensor 2 (15b), the relative humidity sensor 3 (15c), the relative humidity generating device (13), and the control switch (08) are placed in a test box (11).

2. The evaluation method of the composite insulator working characteristic evaluation platform considering environmental humidity according to claim 1, characterized in that: The following steps are involved: Step 1: Measure the feedback current of composite insulator working test under different relative humidity: The relative humidity H in the test box (11) is tested by relative humidity sensor 1 (15a), relative humidity sensor 2 (15b) and relative humidity sensor 3 (15c), and the relative humidity H is transmitted to the host (01) by data acquisition device 2 (07b). The host (01) controls the working test voltage generation controller (02) to set the working test voltage generator (03) to output a set working test voltage with an amplitude of U, adjusts the control switch (08) to turn on the control switch (08), measures the actual working test voltage U1 of the composite insulator by the voltage divider (04) and transmits the measured value to the host (01) by data acquisition device 1 (07a). to the host (01), measuring the working test feedback current I generated by the composite insulator (09) under the working test voltage through the working test current feedback sensor (10), and transmitting the working test feedback current I to the host (01) through the data acquisition device (07a); adjusting the control switch (08) to disconnect the control switch (08), changing the relative humidity in the test box (11) through the relative humidity generating device (13), so that the relative humidity in the test box (11) is between 0% and 100%, repeating the above test steps, and obtaining m groups of corresponding relative humidity, actual working test voltage U1 and working test feedback current I data; Step 2: Calculate the first-level evaluation factor of the composite insulator working characteristics: Substitute the obtained m groups of actual working test voltage and working test feedback current data into formula (1) to obtain the first-level evaluation factor Y of the working characteristics of the m groups of composite insulators: 1K : Y 1K =exp(-39.8I K )+exp(0.61U 1K )-12.399sin(-1.88I K ),K=1,2,3,...,m(1) Y 1K —First-level evaluation factor of working characteristics of composite insulators in group K test, I K —Working test feedback current data measured in group K test, U 1K —actual working test voltage measured in the Kth group test, m—number of tests; Step 3: Calculate the secondary evaluation factors of composite insulator working characteristics: Substituting the measured relative humidity and the actual working test voltage into formula (2), the secondary evaluation factor Y of the working characteristics of group m composite insulators is obtained: 2K ; Y 2K —Secondary evaluation factor of working characteristics of composite insulators in group K test, H K — relative humidity measured in group K test; Based on the above calculations, the evaluation factor Y of the working characteristics of composite insulators under the influence of environmental humidity is: Y—factors for evaluating the working characteristics of composite insulators, Q1—standard weighting factor one, Q2—standard weighting factor two, Q3—standard weighting factor three, Q4—standard weighting factor four; When Y∈(0,0.3], it indicates that the working characteristics of the composite insulator are good; when Y∈(0.3,0.5], it indicates that the working characteristics of the composite insulator are poor and timely maintenance can be arranged; when Y∈(0.5,1.0]), it indicates that the working characteristics of the composite insulator are seriously deteriorated and maintenance should be arranged as soon as possible; when Y∈(1.0,+∞], it indicates that the working characteristics of the composite insulator fail and it should be replaced as soon as possible.

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