CN117269691B - Wall bushing internal state and insulation characteristics test system and method - Google Patents
Wall bushing internal state and insulation characteristics test system and method Download PDFInfo
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- CN117269691B CN117269691B CN202311264937.5A CN202311264937A CN117269691B CN 117269691 B CN117269691 B CN 117269691B CN 202311264937 A CN202311264937 A CN 202311264937A CN 117269691 B CN117269691 B CN 117269691B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Ceramic Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Testing Relating To Insulation (AREA)
Abstract
A wall bushing internal state and insulation characteristic test system and method, in the system, the test temperature in the high-low temperature test box can be regulated; the first wall bushing penetrates into the high-low temperature test box through the flange to connect the inner side and the outer side of the high-low temperature test box; the gas state sensor is arranged in the first wall bushing, the gas state sensor is led out to the outside of the first wall bushing through the sensor outgoing line and the equalizing ring at the end part of the outer side bushing, the gas state numerical value collector is arranged at the other end of the first wall bushing, the gas state numerical value collector is connected with the sensor outgoing line to collect gas state data, the second wall bushing penetrates into the high-low temperature test box through the flange to be connected with the inner side and the outer side of the high-low temperature test box, the high-voltage generator is arranged at the other end of the second wall bushing, and applies high voltage to the second wall bushing and develops partial discharge test to obtain a partial discharge value.
Description
Technical Field
The invention belongs to the technical field of electrical tests, and particularly relates to a system and a method for testing the internal state and insulation characteristics of a wall bushing.
Background
The wall bushing is an electric power device for introducing high voltage into indoor parts such as valve halls, distribution rooms and the like in an electric power system, and is characterized in that one end of the wall bushing is positioned indoors, and the other end of the wall bushing is positioned outdoors. SF 6 gas-insulated wall bushing is an insulating medium with a common structure, and has extremely large temperature variation in northern areas, the day-night temperature difference can reach tens of degrees, the temperature difference can cause the expansion or contraction of the gas in the bushing, the temperature, the pressure, the micro water and other distributions in the wall bushing can be influenced, and then the bushing is subjected to partial discharge, even breakdown accidents. Measuring partial discharge of the wall bushing in a large temperature difference environment can help to know whether equipment in the bushing is affected by stress, deformation or damage under different temperature conditions, whether insulation performance changes exist or not, and knowing the influence of temperature on the wall bushing is helpful for making a reasonable equipment maintenance plan.
Various sensors are required to be implanted in measurement of the gas state inside the sleeve, but for a conventional partial discharge test, when partial discharge is measured by a high-voltage test, the sensors can influence the internal insulation performance of the sleeve, so that the partial discharge measurement cannot be performed by applying high voltage to the sleeve under the condition of internally implanting the sensors, and the influence of the gas state inside the sleeve on the partial discharge cannot be directly estimated.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to solve the problem that the relation between the gas state and the partial discharge cannot be obtained directly at present, the invention provides a wall bushing internal state and insulation characteristic test system and method, and the quantitative relation between the gas state and the partial discharge in the bushing can be obtained directly or even simultaneously.
The wall bushing internal state and insulation characteristic test system includes:
the high-low temperature test box, the first wall bushing, the second wall bushing, the gas state sensor, the gas state value collector and the high-voltage generator, wherein,
The high-low temperature test box can adjust the test temperature in the test box and provide the environment with set temperature and the environment with different temperature changes for the first wall bushing and the second wall bushing;
the first wall bushing penetrates into the high-low temperature test box through the flange to connect the inner side and the outer side of the high-low temperature test box, one end of the first wall bushing, which is positioned at the inner side of the high-low temperature test box, is provided with an inner bushing end equalizing ring, the other end of the first wall bushing, which is positioned at the outer side of the high-low temperature test box, is provided with an outer bushing end equalizing ring, and SF 6 gas is contained in the first wall bushing;
The gas state sensor is arranged in the first wall bushing to detect the gas state, and the gas state sensor is led out to the outside of the first wall bushing through a sensor lead-out wire and a grading ring at the end part of the outer side bushing;
The gas state value collector is positioned at the other end of the first wall bushing and connected with the sensor outgoing line to collect gas state data of the high-low temperature test box in the environment provided by the first wall bushing;
The second wall bushing penetrates into the high-low temperature test box through the flange to connect the inner side and the outer side of the high-low temperature test box, one end of the second wall bushing, which is positioned at the inner side of the high-low temperature test box, is provided with an inner bushing equalizing ring, the other end of the first wall bushing, which is positioned at the outer side of the high-low temperature test box, is provided with an outer bushing equalizing ring, and SF 6 gas which is the same as that in the first wall bushing is contained in the second wall bushing;
The high-voltage generator is positioned at the other end of the second wall bushing to apply high voltage to the second wall bushing to develop a partial discharge test and obtain a partial discharge value under the condition that the high-low temperature test box provides the same environment for the second wall bushing as the first wall bushing.
In the wall bushing internal state and insulation characteristic test system, still include:
A first sleeve center conductor extending along a central axis of the first wall bushing.
In the wall bushing internal state and insulation characteristic test system, still include:
And a second sleeve center conductor extending along a central axis of the second wall bushing.
In the wall bushing internal state and insulation characteristic test system, the first wall bushing and the second wall bushing are all SF 6 gas insulation bushings and are the same in size, material and shape.
In the wall bushing internal state and insulation characteristic test system, the gas state sensor detects the temperature, humidity and pressure values of SF 6 gas in the first wall bushing.
In the wall bushing internal state and insulation characteristic test system, the gas state sensor comprises an MEMS sensor.
In the system for testing the internal state and the insulation property of the wall bushing, the first wall bushing and the second wall bushing are arranged in parallel.
In the wall bushing internal state and insulation characteristic test system, the test temperature is from minus 50 degrees to minus 100 degrees.
In the wall bushing internal state and insulation characteristic test system, the high voltage generator generates alternating current voltage or direct current voltage.
In the system for testing the internal state and the insulation characteristic of the wall bushing, the first wall bushing and the second wall bushing bear the same high-low temperature stress.
In the wall bushing internal state and insulation characteristic test system, the first wall bushing and the second wall bushing are horizontal tubes.
The test method of the wall bushing internal state and insulation characteristic test system comprises the following steps,
Step 1, setting the temperature of a high-low temperature test box, and measuring the gas state inside a first wall bushing at the set temperature to obtain gas state data inside the first wall bushing at the set temperature;
step 2, applying high voltage to the second wall bushing at the set temperature to perform partial discharge test, and obtaining a partial discharge value at the set temperature;
And step 3, obtaining partial discharge values in different gas states at the set temperature based on the measured value of the internal gas state of the first wall bushing and the measured value of the partial discharge of the second wall bushing.
Compared with the prior art, the invention has the following advantages:
The wall bushing internal state and insulation characteristic test system adopts two wall bushings with identical structures to test at the set temperature, one of the two wall bushings is used for measuring the internal gas state at the set temperature, the other is used for measuring partial discharge at the set temperature, and test data of the two bushings are combined and analyzed, so that the quantitative relation between the internal gas state value and the partial discharge value of the bushing at the set temperature is obtained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a system for testing the internal state and insulation properties of a wall bushing according to one embodiment of the present invention;
FIG. 2 is a partial discharge spectrum of a guide rod at 20 degrees in one embodiment of the present invention;
FIG. 3 is a partial discharge spectrum of a guide bar at a temperature of 50 degrees in one embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to figures 1 to 3 and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the substances, and not restrictive of the invention. It should be further noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision. The technical scheme of the present invention will be described in detail below with reference to the accompanying drawings in combination with embodiments.
Unless otherwise indicated, the exemplary implementations/embodiments shown are to be understood as providing exemplary features of various details of some of the ways in which the technical concepts of the present invention may be practiced. Thus, unless otherwise indicated, the features of the various implementations/embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concepts of the present invention.
Cross-hatching and/or shading may be used in the drawings to generally clarify the boundaries between adjacent components. As such, the presence or absence of cross-hatching or shading does not convey or represent any preference or requirement for a particular material, material property, dimension, proportion, commonality between illustrated components, and/or any other characteristic, attribute, property, etc. of a component, unless indicated. In addition, in the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. While the exemplary embodiments may be variously implemented, the particular process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in reverse order from that described. Moreover, like reference numerals designate like parts.
When an element is referred to as being "on" or "over", "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to," or "directly coupled to" another element, there are no intervening elements present. For this reason, the term "connected" may refer to physical connections, electrical connections, and the like, with or without intermediate components.
For descriptive purposes, the invention may use spatially relative terms such as "under … …," under … …, "" under … …, "" lower, "" over … …, "" upper, "" over … …, "" upper "and" side (e.g., as in "sidewall," "the like") to describe one component's relationship to another component(s) as illustrated in the figures. In addition to the orientations depicted in the drawings, the spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture. For example, if the device in the figures is turned over, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "below … …" may encompass both an orientation of "above" and "below". Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising," and variations thereof, are used in the present specification, the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof is described, but the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximation terms and not as degree terms, and as such, are used to explain the inherent deviations of measured, calculated, and/or provided values that would be recognized by one of ordinary skill in the art.
Referring to fig. 1, in one embodiment, the system for testing the internal state and insulation characteristics of a wall bushing according to the present invention includes:
The high-low temperature test box 1 can adjust the test temperature in the test box and provide the environment with set temperature and the environment with different temperature changes for the first wall bushing and the second wall bushing;
a first wall bushing 2 penetrating into the high-low temperature test chamber 1 via a flange 5 to connect the inner side and the outer side of the high-low temperature test chamber 1, wherein one end of the first wall bushing 2, which is positioned at the inner side of the high-low temperature test chamber 1, is provided with an inner bushing end equalizing ring 4, and the other end of the first wall bushing 2, which is positioned at the outer side of the high-low temperature test chamber 1, is provided with an outer bushing end equalizing ring 9, and the first wall bushing accommodates SF 6 gas;
a first sleeve center conductor 6 extending along a central axis of the first wall bushing 2;
A gas state sensor 7 which is arranged in the first wall bushing 2 to detect the gas state, the gas state sensor 7 is led out to the outside of the first wall bushing 2 through a sensor lead-out wire 8 and an outside bushing end equalizing ring 9,
The gas state value collector 10 is positioned at the other end of the first wall bushing 2, and the gas state value collector 10 is connected with the sensor outgoing line 8 to collect gas state data;
A second wall bushing 3 penetrating into the high-low temperature test chamber 1 via a flange to connect the inner side and the outer side of the high-low temperature test chamber 1, wherein an inner bushing equalizing ring is arranged at one end of the second wall bushing 3 positioned at the inner side of the high-low temperature test chamber 1, an outer bushing equalizing ring is arranged at the other end of the first wall bushing 2 positioned at the outer side of the high-low temperature test chamber 1, and SF 6 gas which is the same as that in the first wall bushing is contained in the second wall bushing;
a second bushing center conductor extending along a central axis of the second wall bushing 3;
A high voltage generator 11 is positioned at the other end of the second wall bushing 3 to locally discharge in the second wall bushing 3 and obtain a local discharge value.
In the preferred embodiment of the system for testing the internal state and insulation characteristics of the wall bushing, the first wall bushing 2 and the second wall bushing 3 are both insulating bushings of SF 6 gas and have the same size, material and shape.
In the preferred embodiment of the system for testing the internal state and insulation characteristics of the wall bushing, the gas state sensor 7 detects the temperature, humidity and pressure of the SF 6 gas in the first wall bushing.
In a preferred embodiment of the wall bushing internal state and insulation characteristic test system, the gas state sensor 7 comprises a MEMS sensor.
In the preferred embodiment of the system for testing the internal state and insulation characteristics of the wall bushing, the first wall bushing 2 and the second wall bushing 3 are arranged in parallel.
In the preferred embodiment of the wall bushing internal state and insulation characteristic test system, the test temperature is from-50 degrees below zero to-100 degrees above zero.
In the preferred embodiment of the wall bushing internal state and insulation characteristic test system, the high voltage generator 11 generates an ac voltage or a dc voltage.
In the preferred embodiment of the system for testing the internal state and insulation characteristics of the wall bushing, the first wall bushing 2 and the second wall bushing 3 are subjected to the same high-low temperature stress.
In the preferred embodiment of the system for testing the internal state and insulation characteristics of the wall bushing, the first wall bushing 2 and the second wall bushing 3 are both horizontal tubes.
In one embodiment, the first wall bushing 2 and the second wall bushing 3 are adopted, and the two wall bushings are placed in the high-low temperature test box 1 in parallel, and the high-low temperature test box 1 can set any test temperature from minus 50 degrees to minus 100 degrees and the like. One end of the first wall bushing 2, which is positioned at the inner side of the high-low temperature test box 1, is provided with an inner bushing end equalizing ring 4 for equalizing the electric field so as to avoid corona interference when the high-voltage test performs partial discharge; the first wall bushing 2 is connected with the inner side and the outer side of the high-low temperature test chamber 1 through flanges; the gas state sensor 7 is arranged in the first wall bushing 2, the sensor adopts a MEMS miniaturized sensor, the gas state values such as temperature and/or humidity and/or pressure in SF 6 gas can be measured, the sensor can be arranged on the first bushing center conductor 6 according to the requirement of the measurement position, and the sensor can also be arranged at different positions such as the inner wall of the first wall bushing 2. The gas state sensor 7 is led out of the first wall bushing 2 through a sensor lead-out wire 8 and a grading ring 9 at the end part of the outer bushing and is connected with a gas state value collector 10. In the actual test, the high and low temperature test chamber 1 is set at a certain set temperature, at which the gas state in the first wall bushing 2 used for the test is changed, the distribution of the gas state is related to the external temperature, and the analysis of the gas state in the first wall bushing 2 can be measured by the sensors at different positions in the interior. For the second wall bushing 3, no modification is performed in the second wall bushing 3, no sensor is implanted, at the set temperature, the gas state value in the first wall bushing 2 is measured, meanwhile, the high voltage is applied to the second wall bushing 3 and partial discharge measurement is performed, the applied high voltage can be alternating current or direct current, and the test voltage value can be set as required. Since the two bushings have identical structures and environmental temperatures, the internal gas state value of the first wall bushing 2 at the set temperature can be regarded as the internal gas state value of the second wall bushing 3, and the internal gas state value of the second wall bushing 3 when the high voltage is applied to perform partial discharge measurement can be obtained from the test of the first wall bushing 2.
According to the embodiment, under the same external condition, the two sleeves are used for measuring respectively, one sleeve is used for measuring the internal gas state, the other sleeve is used for measuring the partial discharge, and the corresponding relation between the internal gas state value and the partial discharge value of the sleeve at the set temperature is obtained by combining the measured data of the two sleeves, so that the rule of influence of the internal gas state on the partial discharge of the sleeve is obtained. The invention solves the difficult problems that the gas state sensor 7 can not be implanted in the sleeve when the high-voltage partial discharge test is carried out, and the gas state in the sleeve can not be analyzed in a correlated manner with the partial discharge.
Furthermore, two sleeves are adopted to respectively carry out partial discharge test and gas state test, and the two data are combined to achieve the purpose of obtaining corresponding partial discharge values under different gas states. The two sleeves are tested respectively, and can be synchronized as much as possible, so that the accurate corresponding relation between the gas state value and the partial discharge value is obtained simultaneously and directly.
The test method of the wall bushing internal state and insulation characteristic test system comprises the following steps,
Step 1, setting the temperature of a high-low temperature test box 1, and measuring the gas state inside a first wall bushing 2 at the set temperature to obtain gas state data inside the first wall bushing 2 at the set temperature;
Step 2, applying high voltage to the second wall bushing 3 at the set temperature to perform partial discharge test, and obtaining a partial discharge value at the set temperature;
And step 3, obtaining the partial discharge value of the different gas states at the set temperature based on the measured value of the internal gas state of the first wall bushing 2 and the partial discharge measured value of the second wall bushing 3.
In one embodiment, the total length of the first wall bushing and the second wall bushing is 2 meters, and SF 6 is adopted as an insulating medium inside. Wherein the length of the high-low temperature test chamber is 1 meter, and the length of the high-low temperature test chamber is 1 meter. A gas state sensor is arranged at the inner guide rod of the first wall bushing 2 to sense the temperature of the central guide rod and the air pressure and humidity of SF 6 gas, and simultaneously high voltage is applied to the second wall bushing 3 to carry out partial discharge measurement.
The measurement result of the internal cavity of the first wall bushing 2 shows that the humidity is 560ppm, the temperature of the guide rod is 20 ℃, the air pressure is 0.1MPa, the same voltage is applied to the second wall bushing 3 for partial discharge measurement, and the partial discharge spectrum is shown in figure 2. And raising the temperature value of the high-low temperature test box, and when the measurement result of the internal cavity of the first wall bushing 2 is that the humidity is 410ppm, the temperature of the guide rod is 50 ℃ and the air pressure is 0.1MPa, testing the partial discharge spectrogram measured by the second wall bushing 3, as shown in figure 3. As shown in fig. 2, the measurement results fully reflect the effect of temperature on the partial discharge of the bushing. That is, while the temperature is varied and the humidity is varied, the air pressure within the wall bushing is dependent upon the particular measurement, but this does not prevent accurate calibration of the environment provided by the high and low temperature test chamber by the temperature of the first and second bushing center conductors or guide rods of the present invention.
It can be found that the present embodiment fully embodies the advantages of the present invention, that is, the simultaneous partial discharge measurement under the conditions of temperature and gas humidity/gas pressure measurement by the corresponding sleeve central conductor cannot be achieved by adopting a single sleeve, because: when partial discharge measurement is carried out, high voltage needs to be applied to the sleeve central conductor, which can damage the gas state sensor arranged at the sleeve central conductor, and the scheme of the invention can be adopted to realize: when the high-low temperature test box provides the same environment for the two wall bushings, the internal gas state measurement values of the two wall bushings are correlated with the partial discharge measurement results, and partial discharge analysis under different gas state measurement is obtained.
The gas in the high-low temperature test chamber may be air.
In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "a particular example," "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
It will be appreciated by persons skilled in the art that the above embodiments are provided for clarity of illustration only and are not intended to limit the scope of the invention. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present invention.
Claims (9)
1. The utility model provides a wall bushing internal state and insulating properties test system which characterized in that, it includes:
the high-low temperature test box, the first wall bushing, the second wall bushing, the gas state sensor, the gas state value collector and the high-voltage generator, wherein,
The high-low temperature test box can adjust the test temperature in the test box and provide the environment with set temperature and the environment with different temperature changes for the first wall bushing and the second wall bushing;
the first wall bushing penetrates into the high-low temperature test box through the flange to connect the inner side and the outer side of the high-low temperature test box, one end of the first wall bushing, which is positioned at the inner side of the high-low temperature test box, is provided with an inner bushing end equalizing ring, the other end of the first wall bushing, which is positioned at the outer side of the high-low temperature test box, is provided with an outer bushing end equalizing ring, and SF 6 gas is contained in the first wall bushing;
The gas state sensor is arranged in the first wall bushing to detect the gas state, and the gas state sensor is led out to the outside of the first wall bushing through a sensor lead-out wire and a grading ring at the end part of the outer side bushing;
The gas state value collector is positioned at the other end of the first wall bushing and connected with the sensor outgoing line to collect gas state data of the high-low temperature test box in the environment provided by the first wall bushing;
The second wall bushing penetrates into the high-low temperature test box through the flange to connect the inner side and the outer side of the high-low temperature test box, one end of the second wall bushing, which is positioned at the inner side of the high-low temperature test box, is provided with an inner bushing equalizing ring, the other end of the first wall bushing, which is positioned at the outer side of the high-low temperature test box, is provided with an outer bushing equalizing ring, and SF 6 gas which is the same as that in the first wall bushing is contained in the second wall bushing;
The high-voltage generator is positioned at the other end of the second wall bushing to apply high voltage to the second wall bushing to carry out partial discharge test and obtain partial discharge value under the condition that the high-low temperature test box provides the same environment as the first wall bushing for the second wall bushing, the first wall bushing and the second wall bushing are SF 6 gas insulation bushings and are the same in size, material and shape, and when the high-low temperature test box provides the same environment for the two first wall bushing and the second wall bushing, the internal gas state measured values of the two first wall bushing and the second wall bushing are correlated with the partial discharge measured results to obtain partial discharge analysis under different gas state measurement.
2. The system of claim 1, wherein the gas condition sensor detects temperature, humidity, pressure values of SF 6 gas contained within the first wall bushing.
3. The wall bushing internal condition and insulation property testing system of claim 1, wherein the gas condition sensor comprises a MEMS sensor.
4. The wall bushing internal condition and insulation property testing system of claim 1, wherein the first wall bushing and the second wall bushing are arranged in parallel.
5. The wall bushing internal condition and insulation performance testing system of claim 1, wherein the test temperature is from-50 degrees below zero to-100 degrees above zero.
6. The wall bushing internal condition and insulation property test system of claim 1, wherein the high voltage generator generates an ac voltage or a dc voltage.
7. The wall bushing internal condition and insulation performance testing system of claim 1, wherein the first wall bushing and the second wall bushing are subjected to the same high and low temperature stress.
8. The wall bushing internal condition and insulation property testing system of claim 1, wherein the first wall bushing and the second wall bushing are both horizontal tubes.
9. The method for testing the internal state and insulation property test system of the wall bushing according to any one of claims 1 to 8, comprising the steps of,
Step 1, setting the temperature of a high-low temperature test box, and measuring the gas state inside a first wall bushing at the set temperature to obtain gas state data inside the first wall bushing at the set temperature;
step 2, applying high voltage to the second wall bushing at the set temperature to perform partial discharge test, and obtaining a partial discharge value at the set temperature;
And step 3, obtaining the partial discharge value of the sleeve in different gas states at the set temperature based on the measured value of the internal gas state of the first wall-through sleeve and the measured value of the partial discharge of the second wall-through sleeve.
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Address after: No.6 Qingnian Road, Yingze Street, Yingze District, Taiyuan City, Shanxi Province, 030000 Patentee after: State Grid Shanxi Electric Power Co., Ltd. Electric Power Science Research Institute Country or region after: China Patentee after: XI'AN JIAOTONG University Address before: No.6 Qingnian Road, Yingze Street, Yingze District, Taiyuan City, Shanxi Province, 030000 Patentee before: STATE GRID ELECTRIC POWER Research Institute OF SEPC Country or region before: China Patentee before: XI'AN JIAOTONG University |