Ground wire insulator icing test device and method

Abstract

The present application discloses a ground insulator icing test device and method, the device comprising: a plurality of insulators, an insulator platform and an icing platform; the insulator platform is arranged in the icing platform, comprising: a circular ring; a plurality of mounting slots are evenly distributed on the circular ring; a plurality of insulators are arranged in the mounting slots in a one-to-one correspondence; the icing platform is provided with: a water outlet, a wind speed control system and a temperature control system; the water outlet faces the circular ring; the wind speed control system is used to control the wind speed in the icing platform; the temperature control system is used to control the temperature in the icing platform. By placing insulators on the icing platform, the risk of insulators falling due to hanging can be avoided. At the same time, the water outlet, wind speed control system and temperature control system can be used to simulate outdoor icing conditions to conduct icing experiments. By measuring the experimental results of the plurality of insulators evenly distributed along the circumference of the circular ring one by one, the accuracy of the experiment can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of insulator experimental devices, and in particular to a ground wire insulator icing experimental device and method. Background Art

[0002] In my country, all lines with voltage levels of 110 kV and above require overhead ground wires. Considering the ground wire's energy-saving, lightning protection, and communication performance, the overhead ground wire often utilizes segmented insulation and single-point grounding, connected to the tower via ground wire insulators. Ground wire insulators consist of a conventional insulator and a pair of electrodes with an air gap. Under normal circumstances, the ground wire insulators cut off the path between the ground wire, the tower, and the earth, and serve as a mechanical connection for the overhead ground wire. In the event of lightning or a short-circuit fault on the transmission line, the gap breaks down before the insulator, extinguishing the arc automatically.

[0003] However, due to my country's vast territory, an increasing number of long-distance overhead transmission lines traverse high-altitude, cold, or extreme climate regions, resulting in thick layers of ice covering ground wire insulators and their hardware in these areas. Icing is extremely detrimental to ground wire insulator performance, increasing the load on the insulator. During the thawing period, as the ice on the insulator surface melts, the insulator flashover voltage is significantly reduced, and even the induced voltage on the ground wire can cause a flashover. When ice accumulates on the gap electrode, the gap breakdown voltage is significantly reduced, disrupting the normal gap fit with the insulator and causing abnormal discharge. Therefore, the electrical performance of ground wire insulators under ice must be studied before use.

[0004] Icing experiments on ground wire insulators require the use of an artificial icing chamber. Because the floor of the icing chamber is slippery and the insulators are heavy, the traditional experimental method uses suspended insulators, which is prone to the risk of falling during the experiment, and the experimental results are greatly affected by human factors. Summary of the Invention

[0005] In view of this, the purpose of the present application is to provide a ground wire insulator icing test device and method, which is used to solve the problems of safety risks and large experimental errors in the existing ground wire insulator icing test method.

[0006] To achieve the above technical objectives, the present application provides, in a first aspect, a ground wire insulator icing test device, comprising: a plurality of insulators, an insulator platform, and an icing platform;

[0007] The insulator platform is arranged in the ice-covering platform and includes: a circular ring;

[0008] The ring is provided with a plurality of mounting grooves evenly distributed around the circumference;

[0009] The plurality of insulators are arranged in the mounting groove in a one-to-one correspondence;

[0010] The ice-covering platform is provided with: a water outlet, a wind speed control system and a temperature control system;

[0011] The water outlet faces the ring;

[0012] The wind speed control system is used to control the wind speed in the ice coating platform;

[0013] The temperature control system is used to control the temperature in the ice coating platform.

[0014] Furthermore, the ring is a galvanized metal ring.

[0015] Furthermore, there are twelve installation slots.

[0016] A second aspect of the present application provides a method for testing icing of a ground wire insulator without power supply, which is applied to any of the above-mentioned ground wire insulator icing test devices and includes the following steps:

[0017] S11. Maintaining the ice-covered state within a preset time period, wherein the temperature in the ice-covered table is maintained at -6±1°C, the wind speed is maintained at 3±1 m / s, and the water outlet maintains a water droplet size of 100 to 120 μm and discharges water at a preset interval period;

[0018] S12, raising the temperature in the ice-coating platform to 0±0.5°C at a rate of 2±0.5°C / h and maintaining the temperature;

[0019] S13. After connecting the ring to the high-voltage end and the insulator to the low-voltage end, measure the flashover voltage of each insulator in turn using the uniform voltage step-up method.

[0020] Furthermore, before step S13, the following steps are further included:

[0021] S10, adjusting so that the water outlet is aligned with the insulator closest to the water outlet;

[0022] After step S13, the method further includes:

[0023] S14, gradually changing the angle between the water outlet and the insulator closest to the water outlet, and performing step S13 each time the angle is changed.

[0024] Furthermore, the preset time period is ninety minutes;

[0025] The preset interval period includes a water discharge period and an interval period, the water discharge period is fifteen minutes, and the interval period is fifteen minutes.

[0026] A third aspect of the present application provides a method for testing icing of a ground wire insulator under voltage, which is applied to any of the above-mentioned ground wire insulator icing test devices and includes the following steps:

[0027] S21. Connect the ring to the high voltage end and connect the insulators in parallel;

[0028] S22, maintaining the ice-covered state within a preset time period, wherein the temperature in the ice-covered table is maintained at -6±1°C, the wind speed is maintained at 3±1m / s, the water outlet maintains a water droplet size of 100 to 120μm and discharges water at a preset interval period;

[0029] S23, raising the temperature in the ice-coating platform to 0±0.5°C at a rate of 2±0.5°C / h and maintaining the temperature;

[0030] S24. After connecting the insulator to the low-voltage end, measure the flashover voltage of each insulator in turn using the uniform voltage-boosting method.

[0031] Furthermore, before step S23, the following steps are further included:

[0032] S20, adjusting so that the water outlet is aligned with the insulator closest to the water outlet;

[0033] After step S23, the method further includes:

[0034] S24, gradually changing the angle between the water outlet and the insulator closest to the water outlet, and performing step S23 each time the angle is changed.

[0035] Furthermore, the preset time period is ninety minutes;

[0036] The preset interval period includes a water discharge period and an interval period, the water discharge period is fifteen minutes, and the interval period is fifteen minutes.

[0037] Furthermore, the high voltage terminal potential is 1 kV.

[0038] It can be seen from the above technical solutions that the present application provides a ground insulator icing test device and method, the device comprising: a plurality of insulators, an insulator platform and an icing platform; the insulator platform is arranged in the icing platform, comprising: a circular ring; a plurality of mounting grooves are evenly distributed on the circular ring; a plurality of the insulators are arranged in the mounting grooves in a one-to-one correspondence; the icing platform is provided with: a water outlet, a wind speed control system and a temperature control system; the water outlet faces the circular ring; the wind speed control system is used to control the wind speed in the icing platform; the temperature control system is used to control the temperature in the icing platform. By placing insulators on the icing platform, the risk of insulators falling due to hanging can be avoided. At the same time, the water outlet, wind speed control system and temperature control system can be used to simulate the outdoor icing state to conduct an icing experiment. By measuring the experimental results of the plurality of insulators evenly distributed along the circumference of the circular ring one by one, the accuracy of the experiment can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] Figure 1 A schematic diagram of an icing platform for a ground insulator icing experiment device provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of an insulator disposed on an icing platform in a ground wire insulator icing experimental device provided in an embodiment of the present application;

[0042] Figure 3 A side view of the overall structure of a ground insulator icing experimental device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions of the embodiments of the present application in conjunction with the accompanying drawings. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection requested by this application.

[0044] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0045] In the description of the embodiments of the present application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, replaceable connections, or integral connections. They can also refer to mechanical connections or electrical connections. They can also refer to direct connections or indirect connections through an intermediate medium. They can also refer to internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0046] The embodiments of the present application disclose a ground wire insulator icing test device and method.

[0047] See also Figures 1 to 3 The present application provides a first aspect of a ground insulator icing experimental device provided in the embodiments of the present application, comprising: a plurality of insulators, an insulator platform and an icing platform 4; the insulator platform is arranged in the icing platform 4, comprising: a circular ring 2; a plurality of mounting grooves 1 are evenly distributed on the circular ring 2; a plurality of insulators are arranged in the mounting grooves 1 in a one-to-one correspondence; the icing platform 4 is provided with: a water outlet 3, a wind speed control system and a temperature control system; the water outlet 3 faces the circular ring 2; the wind speed control system is used to control the wind speed in the icing platform 4; the temperature control system is used to control the temperature in the icing platform 4.

[0048] Specifically, the insulator includes an insulating member 5, a steel cap 6, a lower electrode 7, an upper electrode 8, and a steel leg 9. The steel leg 9 can be disposed at the bottom end of the insulating member 5, and the shapes of the mounting groove 1 and the steel leg 9 are adapted to each other, allowing the insulator to be securely mounted on the ring 2 via the steel leg 9. The steel cap 6, lower electrode 7, and upper electrode 8 are all disposed on the insulating member 5, with the lower electrode 7 and upper electrode 8 arranged vertically parallel to each other.

[0049] The ice-coating platform 4 can be a sealed workbench or a sealed room, without limitation. The temperature control system can be a cooling fan combined with a heating fan. The ice-coating platform 4 can also be heated by opening the inlet and outlet of the sealed ice-coating platform 4 to allow outside air to enter the ice-coating room 4 for heating.

[0050] The insulator platform may further include an insulating support 10 , on which the ring 2 is disposed.

[0051] Furthermore, the ring 2 is a galvanized metal ring, and the galvanized ring 2 can effectively improve the corrosion resistance.

[0052] Furthermore, there are twelve mounting grooves 1, so that the angles formed between adjacent mounting grooves 1 and the center of the ring are all 30°.

[0053] Specifically, the inventors considered the influence of the angle between the ground wire insulator and the water outlet 3 on the quality and shape of ice coating, and compared it with the comprehensive influence of cooling water vapor and wind direction on intermittent electrode ice coating in actual outdoor projects. As a result, the number of mounting grooves 1 on the ring 2 was set to 12, which, in conjunction with the wind speed control system and the temperature control system, can simulate the outdoor ice coating condition in the closest state.

[0054] The above is Example 1 provided in the embodiments of this application, and the following is Example 2 provided in the embodiments of this application.

[0055] A second aspect of the present application provides a method for testing ice coating on a ground wire insulator without power supply, which is applied to the ground wire insulator ice coating test device described in any one of the first aspects, and comprises the following steps:

[0056] S11. Maintaining the ice-covered state within a preset time period, wherein the temperature in the ice-covered table is maintained at -6±1°C, the wind speed is maintained at 3±1m / s, the water outlet maintains a water droplet size of 100 to 120μm and discharges water at a preset interval period.

[0057] Specifically, the wind speed inside the ice-coating platform 4 can be controlled by the wind speed control system, the temperature inside the ice-coating platform 4 can be controlled by the temperature control system, and the water droplet particle size and the water outlet interval period can be controlled by controlling the water outlet, thereby realizing the simulation of the actual situation of the outdoor ice-coating project.

[0058] In this embodiment, the preset time period is ninety minutes, that is, the ice covering time is ninety minutes; the preset interval period includes a water discharge period and an interval period, the water discharge period is fifteen minutes, and the interval period is fifteen minutes.

[0059] By controlling the temperature inside the icing platform to -6±1°C, the wind speed to 3±1m / s, the water droplet size to 100 to 120μm, and discharging water at 15-minute intervals, we can simulate the outdoor rime icing of insulators, improving the accuracy of the simulation experiment. The weight of the iced insulator can also be recorded during each interval.

[0060] S12, raising the temperature in the ice-coating platform to 0±0.5°C at a rate of 2±0.5°C / h and maintaining the temperature.

[0061] Among them, by setting the heating rate to 2±0.5℃ / h, it is possible to avoid the ice layer falling off due to excessive heating rate.

[0062] S13. After connecting the ring to the high-voltage end and the insulator to the low-voltage end, measure the flashover voltage of each insulator in turn using the uniform voltage step-up method.

[0063] To ensure the validity of the data, each insulator flashed only once.

[0064] Furthermore, before step S13, the following steps are further included:

[0065] S10, adjusting so that the water outlet is aligned with the insulator closest to the water outlet;

[0066] After step S13, the method further includes:

[0067] S14, gradually changing the angle between the water outlet and the insulator closest to the water outlet, and performing step S13 each time the angle is changed.

[0068] Specifically, the degree-by-degree change means that the insulator is staggered from the water outlet by one degree each time. After the degree-by-degree change, the flashover voltage of each insulator is measured at each angle. After taking the average value, the influence of the angle between the ground wire insulator and the water outlet on the icing rate and flashover voltage under non-charged ice can be obtained.

[0069] The third aspect of the present application provides a method for testing icing of a ground wire insulator under voltage, which is applied to the ground wire insulator icing test device described in any one of the first aspects above, and includes the following steps:

[0070] S21. Connect the ring to the high voltage end and connect the insulators in parallel;

[0071] Among them, the insulators can be connected in parallel by connecting steel caps with wires; the high-voltage end potential is 1kV.

[0072] S22, maintaining the ice-covered state within a preset time period, wherein the temperature in the ice-covered table is maintained at -6±1°C, the wind speed is maintained at 3±1m / s, the water outlet maintains a water droplet size of 100 to 120μm and discharges water at a preset interval period;

[0073] In this embodiment, the preset time period is ninety minutes, that is, the ice covering time is ninety minutes; the preset interval period includes a water discharge period and an interval period, the water discharge period is fifteen minutes, and the interval period is fifteen minutes.

[0074] Similarly, the weight of the ice-covered insulators can be recorded during each interval.

[0075] S23, raising the temperature in the ice-coating platform to 0±0.5°C at a rate of 2±0.5°C / h and maintaining the temperature;

[0076] S24. After connecting the insulator to the low-voltage end, measure the flashover voltage of each insulator in turn using the uniform voltage-boosting method.

[0077] Furthermore, before step S23, the following steps are further included:

[0078] S20, adjusting so that the water outlet is aligned with the insulator closest to the water outlet;

[0079] After step S23, the method further includes:

[0080] S24, gradually changing the angle between the water outlet and the insulator closest to the water outlet, and performing step S23 once each time the angle is changed.

[0081] The ground wire insulator icing experiment and method provided in this embodiment allows grooves 1 to be machined into the ring 2 to match the contours of the steel foot 9, allowing the insulator to be firmly fixed to the ring 2 and not easily loosened. This reduces the difficulty of experimental operation and improves the consistency and accuracy of experimental results. Furthermore, this device can simulate the electrical performance of ground wire insulators under both charged and uncharged icing conditions, and determine the optimal installation angle of the ground wire insulator based on the influence of the angle between the ground wire insulator and the water outlet of the icing chamber on the icing rate and flashover voltage. In actual engineering, based on the experimental results of the present invention, the gap electrode can be adjusted to a specific direction to minimize the amount of icing under the same climatic conditions and maximize the gap breakdown voltage, thereby ensuring stable operation of the overhead ground wire.

[0082] The above are only preferred embodiments of the present application and are not intended to limit the present invention. Although the present application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the aforementioned examples or make equivalent replacements for some of the technical features therein. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A ground wire insulator ice coating test method, characterized in that: Applied to ground wire insulator icing test device; The ground wire insulator icing experimental device comprises: a plurality of insulators, an insulator platform and an icing platform; The insulator platform is arranged in the ice-covering platform and includes: a circular ring; The ring is provided with a plurality of mounting grooves evenly distributed around the circumference; The plurality of insulators are arranged in the mounting groove in a one-to-one correspondence; The ice-covering platform is provided with: a water outlet, a wind speed control system and a temperature control system; The water outlet faces the ring; The wind speed control system is used to control the wind speed in the ice coating platform; The temperature control system is used to control the temperature in the ice coating platform; And includes the following steps: S11. Maintaining the ice-covered state within a preset time period, wherein the temperature in the ice-covered table is maintained at -6±1°C, the wind speed is maintained at 3±1 m / s, and the water outlet maintains a water droplet size of 100 to 120 μm and discharges water at a preset interval period; S12, raising the temperature in the ice-coating platform to 0±0.5°C at a rate of 2±0.5°C / h and maintaining the temperature; S13. After connecting the ring to the high-voltage end and the insulator to the low-voltage end, measure the flashover voltage of each insulator in turn using the uniform voltage step-up method.

2. The ground wire insulator icing test method according to claim 1, characterized in that: Before step S13, the method further includes: S10, adjusting so that the water outlet is aligned with the insulator closest to the water outlet; After step S13, the method further includes: S14, gradually changing the angle between the water outlet and the insulator closest to the water outlet, and performing step S13 each time the angle is changed.

3. The ground wire insulator icing test method according to claim 2, characterized in that: The preset time period is ninety minutes; The preset interval period includes a water discharge period and an interval period, the water discharge period is fifteen minutes, and the interval period is fifteen minutes.

4. A ground wire insulator ice coating test method, characterized in that: Applied to ground wire insulator icing test device; The ground wire insulator icing experimental device comprises: a plurality of insulators, an insulator platform and an icing platform; The insulator platform is arranged in the ice-covering platform and includes: a circular ring; The ring is provided with a plurality of mounting grooves evenly distributed around the circumference; The plurality of insulators are arranged in the mounting groove in a one-to-one correspondence; The ice-covering platform is provided with: a water outlet, a wind speed control system and a temperature control system; The water outlet faces the ring; The wind speed control system is used to control the wind speed in the ice coating platform; The temperature control system is used to control the temperature in the ice coating platform; And includes the following steps: S21. Connect the ring to the high voltage end and connect the insulators in parallel; S22, maintaining the ice-covered state within a preset time period, wherein the temperature in the ice-covered table is maintained at -6±1°C, the wind speed is maintained at 3±1m / s, the water outlet maintains a water droplet size of 100 to 120μm and discharges water at a preset interval period; S23, raising the temperature in the ice-coating platform to 0±0.5°C at a rate of 2±0.5°C / h and maintaining the temperature; S24. After connecting the insulator to the low-voltage end, measure the flashover voltage of each insulator in turn using the uniform voltage-boosting method.

5. The ground wire insulator icing test method according to claim 4, characterized in that: Before step S23, the method further includes: S20, adjusting so that the water outlet is aligned with the insulator closest to the water outlet; After step S23, the method further includes: S24, gradually changing the angle between the water outlet and the insulator closest to the water outlet, and performing step S23 each time the angle is changed.

6. The ground wire insulator icing test method according to claim 4, characterized in that: The preset time period is ninety minutes; The preset interval period includes a water discharge period and an interval period, the water discharge period is fifteen minutes, and the interval period is fifteen minutes.

7. The ground wire insulator icing test method according to claim 4, characterized in that: The high voltage terminal potential is 1 kV.

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