External insulation discharge test system and method for wall bushing under actual operating conditions

Abstract

A system and method for testing the external insulation discharge of a through-wall bushing under actual operating conditions is disclosed. The system mainly includes a first through-wall bushing, a second through-wall bushing identical to the first, a high and low temperature test chamber, a first photon counter, a second photon counter identical to the first, and a differential circuit. This invention cleverly eliminates the need for a large and complex artificial climate chamber. Utilizing the environmental differences inside and outside the high and low temperature test chamber, it obtains the number of ultraviolet photons caused by discharge under various actual operating conditions, including rain, snow, ice, and pollution, through the differential principle. Furthermore, this invention can simultaneously apply voltage and current to the internal conductor of the through-wall bushing to perform external insulation discharge testing on the through-wall bushing under various actual operating conditions.

Description

Technical Field

[0001] The invention relates to the field of electrical testing, and in particular to a system and method for testing the external insulation discharge of a wall bushing under actual operating conditions. Background Art

[0002] The wall bushing is an electrical device that introduces high voltage into the valve hall, distribution room and other indoor parts of the power system. Its characteristic is that one end is located indoors and the other end is located outdoors. In actual operation, the wall bushing will be subjected to high voltage and high current stress. In addition, the external insulation on the outdoor side will also be subject to various working conditions such as rain, snow, ice and pollution, causing external insulation discharge on the outdoor side of the bushing.

[0003] For the outdoor insulation discharge test of the wall bushing, the existing technology mainly places the bushing in an artificial climate chamber to simulate rain, snow, ice and pollution conditions for discharge testing. This method requires an expensive artificial climate chamber and can only apply voltage but not current, making it difficult to truly simulate the actual operating conditions on site.

[0004] The information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0005] In view of the deficiencies or defects of the prior art, a system and method for testing the external insulation discharge of a wall bushing under actual operating conditions are provided, which can realize the external insulation discharge test of the wall bushing under actual operating conditions without the need for an artificial climate chamber.

[0006] The purpose of the present invention is achieved through the following technical solutions.

[0007] A system for testing external insulation discharge of a wall bushing under actual operating conditions, comprising:

[0008] a first wall bushing, a second wall bushing identical to the first wall bushing, a high and low temperature test chamber, a first photon counter, a second photon counter identical to the first photon counter, and a differentiator,

[0009] in,

[0010] A portion of the first wall bushing is located in a high and low temperature test box, wherein the high and low temperature test box is used to simulate various actual operating conditions including rain, snow, ice, and dirt, and the first photon counter is located in the high and low temperature test box.

[0011] The second wall bushing and the second photon counter are both located outside the high and low temperature test box, wherein there is no rain, snow, ice or dirt outside the high and low temperature test box.

[0012] The system simultaneously applies voltage and / or current under the same conditions to the internal conductors of the same specifications in the first wall bushing and the second wall bushing to perform an external insulation discharge test, and uses a differentiator to perform differential processing on the photon counting information from the first photon counter and the second photon counter, so as to determine the number of ultraviolet photons caused by discharge under various actual operating conditions including rain, snow, ice, and dirt.

[0013] In the system described,

[0014] In the high and low temperature test box, the lower end of the inner conductor of the first wall bushing is connected to one end of the first lead-out terminal via a connecting cable.

[0015] In the system described,

[0016] The relative position relationship between the second photon counter and the second wall-penetrating sleeve is exactly the same as the relative position relationship between the first photon counter and the first wall-penetrating sleeve.

[0017] In the system described,

[0018] The system can not only apply the same voltage to the internal conductors of the first wall bushing and the second wall bushing, but also apply the same current to the internal conductors of the first wall bushing and the second wall bushing, and the values ​​of the voltage and / or current can be adjusted to different levels.

[0019] In the system described,

[0020] The first lead terminal is inserted into the high and low temperature test box.

[0021] In the system described,

[0022] The other end of the first lead terminal is connected to the lower end of the inner conductor of the second wall bushing.

[0023] In the system described,

[0024] In the high and low temperature test box, the first photon counter is connected to one end of the second lead terminal.

[0025] In the system described,

[0026] The other end of the second lead terminal is connected to one end of the differentiator.

[0027] In the system described,

[0028] The other end of the differentiator is connected to the second photon counter.

[0029] The present invention also discloses a method of the system, which comprises the following steps:

[0030] applying different voltages and / or different currents to the internal conductors of the first wall bushing and the second wall bushing,

[0031] Use a high and low temperature test chamber to simulate various actual operating conditions including rain, snow, ice, and dirt on the first wall bushing.

[0032] The photon counting information from the first photon counter and the second photon counter is differentially processed by a differentiator to determine the number of ultraviolet photons caused by discharge under various actual operating conditions including rain, snow, ice, and dirt.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention can simulate the actual operating conditions of the wall bushing by using a high and low temperature test chamber to simulate different actual working conditions such as rain, snow, ice, and dirt on the outdoor side of the bushing, and conduct research on the external insulation discharge of the bushing by testing the photons generated by the discharge. The present invention has the advantages of being able to simulate the bushing being subjected to various voltages and currents at the same time during actual operation, and can accurately obtain the external insulation discharge caused by different working conditions through photon differential testing, providing a novel and ingenious system and method for testing the external insulation discharge of the outdoor side of the wall bushing under actual operating conditions.

[0035] The above description is only an overview of the technical solution of the present invention. In order to make the technical means of the present invention clearer and to achieve the extent that those skilled in the art can implement it according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] By reading the detailed description of the preferred specific embodiments below, various other advantages and benefits of the present invention will become clear to those of ordinary skill in the art. The drawings in the specification are only for the purpose of illustrating the preferred embodiments and are not considered to be limitations of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work. Moreover, the same reference numerals are used to represent the same components throughout the drawings.

[0037] In the attached picture:

[0038] Figure 1 It is a structural schematic diagram of the wall bushing multi-stress test system of the present invention.

[0039] The present invention is further explained below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0040] The specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0041] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the attached claims.

[0042] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each of the accompanying drawings does not constitute a limitation on the embodiments of the present invention.

[0043] For a better understanding, Figure 1 As shown, a system for testing the external insulation discharge of a wall bushing under actual operating conditions comprises:

[0044] A first wall bushing 1, a second wall bushing 2 identical to the first wall bushing, a high and low temperature test chamber 3, a first photon counter 9, a second photon counter 10 identical to the first photon counter, and a differentiator 12,

[0045] in,

[0046] A portion of the first wall bushing 1 is located in a high and low temperature test box 3, wherein the high and low temperature test box 3 is used to simulate various actual operating conditions including rain, snow, ice, and dirt, and the first photon counter 9 is located in the high and low temperature test box 3.

[0047] The second wall bushing 2 and the second photon counter 10 are both located outside the high and low temperature test box, wherein there is no rain, snow, ice or dirt outside the high and low temperature test box.

[0048] The system simultaneously applies voltage and / or current under the same conditions to the internal conductors of the first wall bushing 1 and the second wall bushing 2 of the same specifications to perform an external insulation discharge test, and uses a differentiator 12 to perform differential processing on the photon counting information from the first photon counter 9 and the second photon counter 10, so as to determine the number of ultraviolet photons caused by discharge under various actual operating conditions including rain, snow, ice, and dirt.

[0049] For the above embodiment, the present invention uses a high and low temperature test box with a width slightly larger than that of the first wall bushing to replace the artificial climate chamber, thereby greatly facilitating the external insulation discharge test of the wall bushing under actual operating conditions, and on the premise that the internal conductors of the bushings in the two wall bushings have the same electrical stress due to the application of voltage and / or current under the same conditions, the counting information of the two photon counters is cleverly processed by a differentiator, thereby obtaining the number of ultraviolet photons caused by discharge under various actual operating conditions.

[0050] In the system described,

[0051] In the high and low temperature test box 3 , the lower end of the inner conductor of the first wall bushing 1 is connected to one end of the first lead-out terminal 5 via a connecting cable 4 .

[0052] In a preferred embodiment of the system,

[0053] The relative position relationship between the second photon counter 10 and the second wall bushing 2 is exactly the same as the relative position relationship between the first photon counter 9 and the first wall bushing 1 .

[0054] For example,

[0055] The bottoms of the first wall sleeve 1 and the second wall sleeve 2 are at the same horizontal position, and the tops are also at the same horizontal position;

[0056] The first photon counter 9 and the second photon counter 10 are positioned flush with each other;

[0057] The distance between the first photon counter 9 and the first wall bushing 1 is the same as the distance between the second photon counter 10 and the second wall bushing 2 .

[0058] In a preferred embodiment of the system,

[0059] The system can not only apply the same voltage to the internal conductors of the first wall bushing 1 and the second wall bushing 2, but also apply the same current to the internal conductors of the first wall bushing 1 and the second wall bushing 2, and the values ​​of the voltage and / or current can be adjusted to different levels.

[0060] Exemplarily, the system includes an AC test transformer 8, the output end of which is electrically connected to the upper end of the inner conductor of each of the first wall bushing 1 and the second wall bushing 2, so that the same voltage is simultaneously applied to the inner conductor of each of the first wall bushing 1 and the second wall bushing 2, wherein the voltage can be adjusted. In this way, the present invention can realize the external insulation discharge test of the wall bushing under different voltages.

[0061] Furthermore, the system includes a through-type current booster 7, and the upper ends of the internal conductors of the first wall bushing 1 and the second wall bushing 2 are connected to the output end of the AC test transformer 8 through the through-type current booster 7 via the same bare wire 6. In this way, the present invention can simultaneously adjust the voltage and current applied to the internal conductors of the first wall bushing 1 and the second wall bushing 2 by controlling the AC test transformer 8 and the through-type current booster 7. In addition, the through-type current booster 7 and the bare wire 6 are based on induction, and there is no need to worry about insulation between the two. Therefore, there is gas between the two, such as air, and the gas isolates the bare wire and the through-type current booster, so that the through-type current booster 7 applies AC current to the circuit in an inductive manner.

[0062] In the system described,

[0063] By connecting the two inner conductors of the bushings in series, a complete loop is formed, and the inner conductors of the two bushings can be subjected to the same current value at the same time through the through-type current booster; considering that the AC test transformer also applies the same voltage to the inner conductors of the two bushings through the wires of the loop. In this way, the inner conductors of the two bushings are subjected to the same voltage and current values ​​at the same time. In the system described above, the second through-wall bushing and its inner conductor are outside the high and low temperature test chamber compared to the first through-wall bushing and its inner conductor, which causes the external environment of the two to be different. Therefore, the combination of the differentiator enables the system to determine the number of ultraviolet photons caused by external insulation discharge under various actual operating conditions including rain, snow, ice, and dirt based on the principle of differential.

[0064] In a preferred embodiment of the system,

[0065] The first lead terminal 5 is disposed on the high and low temperature test box 3 .

[0066] In a preferred embodiment of the system,

[0067] The other end of the first lead terminal 5 is connected to the lower end of the inner conductor of the bushing in the second wall bushing 2 .

[0068] In a preferred embodiment of the system,

[0069] In the high and low temperature test box 3, the first photon counter 9 is connected to one end of the second lead terminal 11. Exemplarily, the second lead terminal 11 is arranged on the high and low temperature test box 3, and the second lead terminal and the first lead terminal are respectively arranged at two diagonal positions of the high and low temperature test box to be as far away from each other as possible.

[0070] In a preferred embodiment of the system,

[0071] The high and low temperature test box 3 also includes a simulation device for simulating various actual operating conditions including rain, snow, ice, and dirt. Exemplarily, the simulation device is located outside the high and low temperature test box 3 and is connected to the internal space of the high and low temperature test box 3 through one or more connection ports. Typically, the simulation device includes an ice maker, a snow machine, a rain machine, etc. For example, the ice maker, snow machine, rain machine, etc. used in the film and television industry can be used in the present invention by appropriately modifying the connection port. In addition, the simulation device can simulate the dirt by blowing the dirt collected by a vacuum cleaner through the connection port into the high and low temperature test box through the backblowing method. In addition, the simulation device also includes a blowing device, a humidifier, a heater, etc. to simulate the airflow, temperature, humidity, etc. in the high and low temperature test box.

[0072] In a preferred embodiment of the system,

[0073] The high and low temperature test box 3 is also provided with an observation window, so that the operator can check the situation in the high and low temperature test box through the observation window.

[0074] In a preferred embodiment of the system,

[0075] The other end of the second lead terminal 11 is connected to one end of the differentiator 12 .

[0076] In a preferred embodiment of the system,

[0077] The other end of the differentiator 12 is connected to the second photon counter 10 .

[0078] In another embodiment, the present invention also discloses a method of the system, which comprises the following steps:

[0079] Applying the same voltage and / or the same current to the inner conductors of the first wall bushing 1 and the second wall bushing 2, wherein the voltage and / or the current can be adjusted to different levels,

[0080] Use high and low temperature test chambers to simulate various actual operating conditions including rain, snow, ice, and dirt on the first wall bushing.

[0081] The photon counting information from the first photon counter 9 and the second photon counter 10 is differentially processed by a differentiator 12 to determine the number of ultraviolet photons caused by discharge under various actual operating conditions including rain, snow, ice, and dirt.

[0082] See also Figure 1 , which reveals that the system of the present invention is only composed of a first wall bushing 1 (with an internal bushing conductor) and a second wall bushing 2 of the same specifications, a high and low temperature test chamber 3, a connecting cable 4, a first lead terminal 5, a bare wire 6, a through-type current booster 7, an AC test transformer 8, a first photon counter 9, a second photon counter 10, a second lead terminal 11, and a differentiator 12. Therefore, the present invention cleverly avoids the need for a large and complex artificial climate chamber, utilizes the environmental differences inside and outside the high and low temperature test chamber, and obtains the number of ultraviolet photons caused by discharge under various actual operating conditions including rain, snow, ice, and dirt through the differential principle.

[0083] In another embodiment,

[0084] Two 110kV wall bushings were used as test objects. A current of 1000A was applied using a through-type current booster, and a test voltage of 80kV was applied using an AC test transformer. The temperature in the high and low temperature test chamber was set to -20℃, and ice was applied to the flange of the bushing. During the test, it was found that the number of photons in the high and low temperature test chamber was 122000, and the number of photons outside the high and low temperature test chamber was 7800. The differential value was 114200, thereby achieving accurate detection of the number of discharge photons caused by icing.

[0085] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0086] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A system for testing the external insulation discharge of a wall bushing under actual operating conditions, characterized in that: These include, a first wall bushing, a second wall bushing identical to the first wall bushing, a high and low temperature test chamber, a first photon counter, a second photon counter identical to the first photon counter, and a differentiator, in, A portion of the first wall bushing is located in a high and low temperature test box, wherein the high and low temperature test box is used to simulate various actual operating conditions including rain, snow, ice, and dirt, and the first photon counter is located in the high and low temperature test box. The second wall bushing and the second photon counter are both located outside the high and low temperature test box, wherein there is no rain, snow, ice or dirt outside the high and low temperature test box. The system applies voltage and / or current under the same conditions to the internal conductors of the same specifications in the first wall bushing and the second wall bushing at the same time to perform external insulation discharge test, and uses a differentiator to perform differential processing on the photon counting information from the first photon counter and the second photon counter, so as to determine the number of ultraviolet photons caused by discharge under various actual operating conditions including rain, snow, ice, and dirt.

2. The system according to claim 1, characterized in that Preferably, In the high and low temperature test box, the lower end of the inner conductor of the first wall bushing is connected to one end of the first lead-out terminal via a connecting cable.

3. The system according to claim 1, characterized in that The relative position relationship between the second photon counter and the second wall-penetrating sleeve is exactly the same as the relative position relationship between the first photon counter and the first wall-penetrating sleeve.

4. The system according to claim 1, characterized in that The system can not only apply the same voltage to the internal conductors of the first wall bushing and the second wall bushing, but also apply the same current to the internal conductors of the first wall bushing and the second wall bushing, and the values ​​of the voltage and / or current can be adjusted to different levels.

5. The system according to claim 2, characterized in that The first lead terminal is inserted into the high and low temperature test box.

6. The system according to claim 2, characterized in that The other end of the first lead terminal is connected to the lower end of the inner conductor of the second wall bushing.

7. The system according to claim 1, characterized in that In the high and low temperature test box, the first photon counter is connected to one end of the second lead terminal.

8. The system according to claim 7, characterized in that The other end of the second lead terminal is connected to one end of the differentiator.

9. The system according to claim 7, characterized in that The other end of the differentiator is connected to the second photon counter.

10. The method of the system according to any one of claims 1 to 9, characterized in that: It includes the following steps, Applying the same voltage and / or the same current to the inner conductors of the first wall bushing and the second wall bushing, wherein the voltage and / or the current can be adjusted to different levels, Use a high and low temperature test chamber to simulate various actual operating conditions including rain, snow, ice, and dirt on the first wall bushing. The photon counting information from the first photon counter and the second photon counter is differentially processed by a differentiator to determine the number of ultraviolet photons caused by discharge under various actual operating conditions including rain, snow, ice, and dirt.

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