CN114563530A - Test method for moisture absorption performance of adsorbent in voltage transformer - Google Patents

Abstract

The invention relates to a method for detecting moisture absorption performance of an absorbent in a voltage transformer. The detection comprises the following steps: the utility model provides a test voltage transformer, test voltage transformer include casing, humidity transducer and adsorber, and inside humidity transducer and adsorber all located the casing, humidity transducer was used for detecting the inside humidity of casing, and the adsorber is used for placing and waits to detect the adsorbent. The adsorbent to be detected is placed in the adsorber, the humidity inside the shell is detected through the humidity sensor, and the change relation of the humidity inside the shell along with time is recorded. According to the detection method, the hygroscopic property of the adsorbent to be detected can be represented through the humidity inside the shell, the change relation of the adsorbent to be detected along with time is obtained, the hygroscopic property of the adsorbent is detected, the performance database of the adsorbent is enriched, and more bases are provided for the selection of the adsorbent.

Description

Test method for moisture absorption performance of adsorbent in voltage transformer

technical field

The invention relates to the technical field of electrical components, in particular to a method for detecting the moisture absorption performance of an adsorbent in a voltage transformer.

Background technique

The voltage transformer is an important component in the gas-insulated fully enclosed combined electrical appliance (GIS). stability.

In order to maintain the performance of the voltage transformer, SF ₆ gas is often added inside it. SF ₆ gas can provide a good insulating environment inside the voltage transformer to avoid short circuit problems. However, with the prolongation of the use time of electrical equipment, the introduction of SF ₆ gas will inevitably bring about the problem of increased humidity inside the voltage transformer. When the humidity reaches a certain level, the risk of voltage transformer failure will be greatly increased.

In the use of voltage transformers, in order to reduce the humidity inside, the use of adsorbents is a better method. By arranging the adsorbent in the voltage transformer, the moisture in the voltage transformer can be adsorbed, and the humidity inside the voltage transformer can be reduced. However, regarding the performance detection of the adsorbent, the traditional method can usually only detect the performance of the adsorbent itself, and it is difficult to detect the performance of the adsorbent in the voltage transformer.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a method that can detect the moisture absorption performance of the adsorbent in the voltage transformer, thereby enriching the performance database of the adsorbent, and providing more basis for the selection of the adsorbent.

In order to solve the above technical problems, the technical scheme of the present invention is:

A method for detecting the moisture absorption performance of an adsorbent in a voltage transformer, comprising the following steps:

A test voltage transformer is provided, the test voltage transformer includes a housing, a humidity sensor and an adsorber, the humidity sensor and the adsorber are both arranged inside the housing, and the humidity sensor is used to detect the housing Humidity inside the body, the adsorber is used to place the adsorbent to be detected;

The adsorbent to be detected is placed in the adsorber, the humidity inside the casing is detected by the humidity sensor, and the change relationship of the humidity inside the casing with time is recorded.

In one embodiment, the humidity inside the casing is detected by the humidity sensor, and the detection period is controlled to be gradually extended.

In one embodiment, the humidity inside the housing is detected by the humidity sensor, and the detection period is controlled to be more than 10s; and/or,

The humidity inside the casing is detected by the humidity sensor, and the detection period is controlled to be less than 2 hours.

In one embodiment, the humidity inside the housing is detected by the humidity sensor, and the detection period is controlled to be 10s, 30s, 1min, 5min, 10min, 30min, 1h and 2h in sequence; and/or,

The humidity inside the casing is detected by the humidity sensor, and the detection time is controlled to be more than 10 months.

In one embodiment, the test voltage transformer further includes a hollow connection pipe, a support plate, a positioning plate, a sealing flange and an electrical connection terminal;

The casing is provided with a through hole, the hollow connecting pipe protrudes from the surface of the casing, and the cavity of the hollow connecting pipe communicates with the through hole; the support plate is fixed to the hollow Connect the inner wall of the pipe, the support plate is provided with a guide groove, the positioning plate is set in the guide groove, the humidity sensor is fixed on the positioning plate, and the positioning plate can move along the guide groove to use for driving the humidity sensor to move in the cavity of the hollow connecting pipe;

The sealing flange is connected to one end of the hollow connecting pipe away from the casing for sealing the hollow connecting pipe; the electrical connecting terminal is arranged on the sealing flange, and the electrical connecting terminal has a functional end and a control end, the functional end protrudes into the cavity of the hollow connecting pipe, the control end protrudes in a direction away from the hollow connecting pipe, and the functional end is electrically connected with the humidity sensor , the control terminal is used for electrical connection with the external controller.

In one embodiment, the adsorber is closer to the top of the housing than the through hole.

In one embodiment, the support plate has an installation part and a support part, the installation part is fixed on the inner wall of the hollow connecting pipe, and the support part protrudes from the installation part for supporting the positioning the board, the guide groove is arranged on the support part.

In one of the embodiments, the support portion is parallel to the axis of the hollow connecting pipe.

In one embodiment, the positioning plate is provided with a positioning card slot, and the humidity sensor is clipped in the positioning card slot.

In one embodiment, the groove wall of the positioning card groove is perpendicular to the axis of the hollow connecting pipe.

The method for detecting the moisture absorption performance of the adsorbent in the above-mentioned voltage transformer includes the following steps: providing a test voltage transformer, the test voltage transformer includes a housing, a humidity sensor and an adsorber, the humidity sensor and the adsorber are both arranged inside the housing, and the humidity sensor It is used to detect the humidity inside the shell, and the adsorber is used to place the adsorbent to be detected. The adsorbent to be detected is placed in the adsorber, the humidity inside the casing is detected by the humidity sensor, and the change relationship of the humidity inside the casing with time is recorded. Through the above detection method, the hygroscopic performance of the adsorbent to be detected can be characterized by the humidity inside the shell, and the variation relationship of the adsorbent to be detected with time can be obtained, and then the hygroscopic performance of the adsorbent can be detected, and then the performance database of the adsorbent can be enriched, which is The choice of adsorbent provides more basis. Further, in the detection process, when the humidity inside the casing is higher than the humidity threshold, it can be determined that the moisture absorption performance of the adsorbent to be detected is unqualified and cannot be used in a voltage transformer. That is, the above detection method can also judge whether the adsorbent is available, and find the unavailable adsorbent in time.

Description of drawings

1 is a schematic structural diagram of a test voltage transformer in an embodiment of the present invention;

Fig. 2 is the top view of the test voltage transformer corresponding to Fig. 1;

Fig. 3 is the internal schematic diagram of the hollow connecting pipe of the test voltage transformer corresponding to Fig. 1;

Fig. 4 is the structural representation of the support plate of the test voltage transformer corresponding to Fig. 1, wherein (a) is a front view, (b) is a bottom view;

Fig. 5 is the structural representation of the positioning plate of the test voltage transformer corresponding to Fig. 1, wherein (a) is a front view, (b) is a bottom view;

Fig. 6 is the structural representation of the locking plate of the test voltage transformer corresponding to Fig. 1, wherein (a) is a front view, (b) is a bottom view;

FIG. 7 is a comparison diagram of the variation relationship of the humidity inside the casing with time in Example 1 of the present invention and Comparative Example 1;

FIG. 8 is a graph showing the relationship between the humidity inside the casing and the temperature in Embodiment 1 of the present invention.

Description of marks in the figure:

100, test voltage transformer; 101, shell; 102, connecting flange; 1021, connecting flange fixing hole; 103, hollow connecting pipe; 1031, fixing seat; 104, sealing flange; 1041, sealing flange fixing hole ;105, electrical connection terminal; 1051, functional end; 106, adsorber; 107, globe valve; 108, self-sealing joint; 109, protective cap; 110, insulator; 201, humidity sensor; 202, support plate; 2021, installation part 2022, the support part; 20221, the guide groove; 203, the positioning plate; 2031, the positioning card slot;

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

An embodiment of the present invention provides a method for detecting the moisture absorption performance of an adsorbent in a voltage transformer. The detection method includes the following steps: providing a test voltage transformer 100, the test voltage transformer 100 includes a housing 101, a humidity sensor 201 and an adsorber 106, the humidity sensor 201 and the adsorber 106 are both arranged inside the housing 101, and the humidity sensor 201 It is used to detect the humidity inside the casing 101, and the adsorber 106 is used to place the adsorbent to be detected. The adsorbent to be detected is placed in the adsorber, the humidity inside the casing is detected by the humidity sensor, and the change relationship of the humidity inside the casing with time is recorded. Through this detection method, the moisture absorption performance of the adsorbent to be detected can be characterized by the humidity inside the shell, and the change relationship of the adsorbent to be detected with time can be obtained, and then the moisture absorption performance of the adsorbent can be detected, and then the performance database of the adsorbent can be enriched for The choice of adsorbent provides more basis. Further, in the detection process, when the humidity inside the casing is higher than the humidity threshold, it can be determined that the moisture absorption performance of the adsorbent to be detected is unqualified and cannot be used in a voltage transformer. That is to say, the detection method can also judge whether the adsorbent is available, and discover the unavailable adsorbent in time.

In one of the embodiments, the control detection period is gradually extended. The control detection period is gradually extended to facilitate the acquisition of more stable detection humidity data. It can be understood that the detection period represents the time interval between two adjacent detections.

Further, the humidity inside the casing is detected by the humidity sensor, and the detection period is controlled to be more than 10s. If the detection period is too short, the detection frequency is too high, which may increase the load of the humidity sensor.

Further, the humidity inside the casing is detected by the humidity sensor, and the detection period is controlled to be less than 2h. If the detection period is too long, it may be difficult for the detection data to reflect the real situation of humidity changes in the housing, resulting in a decrease in detection accuracy.

Further, the humidity inside the casing is detected by the humidity sensor, and the control detection period is 10s, 30s, 1min, 5min, 10min, 30min, 1h and 2h in sequence.

Further, the humidity inside the casing is detected by the humidity sensor, and the time for the detection is controlled to be more than 10 months. Controlling the detection time for more than 10 months can make the detection data cover the four seasons of the year, which can better reflect the real situation of the humidity inside the shell. Optionally, the period of control detection is more than 11 months. Optionally, the period of control detection is more than 12 months. It can be understood that the detection time represents the time for which the humidity detection in the housing continues.

It can be understood that, before using the humidity sensor to detect the humidity inside the housing, it further includes the following step: verifying the reliability of the detection data of the humidity sensor. For example, the reliability of the detection data of the humidity sensor can be verified by the measurement verification unit.

It can also be understood that, before the humidity sensor is used to detect the humidity inside the casing, the following step is further included: verifying the accuracy of the detection data of the humidity sensor. For example, by comparing with the detection data of the offline humidity sensor, the deviation of the detection data is considered to meet the accuracy requirements within ±5%.

Please refer to Figure 1 to Figure 6. In a specific example, the test voltage transformer further includes a hollow connection pipe 103 , a support plate 202 , a positioning plate 203 , a sealing flange 104 and an electrical connection terminal 105 . The casing 101 is provided with a through hole (not shown in the figure), the hollow connecting pipe 103 protrudes from the surface of the casing 101, and the cavity of the hollow connecting pipe 103 communicates with the through hole; the support plate 202 is fixed on the hollow connecting pipe On the inner wall of 103, the support plate 202 is provided with a guide groove 20221, the positioning plate 203 is set in the guide groove 20221, the humidity sensor 201 is fixed on the positioning plate 203, and the positioning plate 203 can move along the guide groove 20221 for driving the humidity sensor 201 move within the cavity of the hollow connecting tube 103 . The sealing flange 104 is connected to the end of the hollow connecting pipe 103 away from the casing 101 for sealing the hollow connecting pipe 103; the electrical connecting terminal 105 is arranged on the sealing flange 104, and the electrical connecting terminal 105 has a functional end 1051 and a control end ( (not shown in the figure), the functional end 1051 extends into the cavity of the hollow connecting pipe 103, the control end protrudes in a direction away from the hollow connecting pipe 103, the functional end 1051 is electrically connected with the humidity sensor 201, and the control end is used for connecting with the humidity sensor 201. The external controller is electrically connected.

Referring to FIG. 4 again, in a specific example, the support plate 202 has a mounting portion 2021 and a support portion 2022 , the mounting portion 2021 is fixed on the inner wall of the hollow connecting pipe 103 , and the support portion 2022 extends from the mounting portion 2021 for supporting The positioning plate 203 and the guide groove 20221 are arranged on the support portion 2022 . Further, the support portion 2022 is parallel to the axis of the hollow connecting pipe 103 . By disposing the mounting portion 2021 , the supporting portion 2022 can protrude from the inner wall of the hollow connecting pipe 103 to avoid interference with the inner wall of the hollow connecting pipe 103 , which is beneficial to improve the installation stability of the humidity sensor 201 . Still further, the support portion 2022 is vertically arranged with the mounting portion 2021 .

Specifically, the length of the guide groove 20221 is 75mm˜85mm. That is, the movement stroke of the positioning plate 203 along the guide groove 20221 is 75mm˜85mm. Optionally, the length of the guide groove 20221 is 75mm, 76mm, 77mm, 78mm, 79mm, 80mm, 81mm, 82mm, 83mm, 84mm or 85mm.

Referring to FIG. 5 again, in a specific example, the positioning plate 203 is provided with a positioning slot 2031 , and the humidity sensor 201 is snapped into the positioning slot 2031 . The setting of the positioning card slot 2031 enables the humidity sensor 201 to be installed on the positioning plate 203 more stably. Further, the groove wall of the positioning groove 2031 is perpendicular to the axis of the hollow connecting pipe 103 . In this way, the parallel arrangement relationship between the humidity sensor 201 and the inner wall of the hollow connecting pipe 103 can be further maintained, so that the movement of the humidity sensor 201 is smoother.

In a specific example, the positioning card slot 2031 extends to the inside of the housing 101 , and the detection end of the humidity sensor 201 is clipped into the positioning card slot 2031 . At this time, the humidity information inside the casing 101 can be directly detected by the humidity sensor 201 .

Referring again to FIG. 5 , in a specific example, the positioning plate 203 has a raised portion 2032 , and the raised portion 2032 is connected to the support plate 202 for making the positioning slot 2031 protrude from the support plate 202 . The positioning slot 2031 can be protruded from the support plate 202 by the arrangement of the raised portion 2032 , which can effectively prevent the humidity sensor 201 from colliding and interfering with the components in the hollow connecting pipe 103 during the movement. Further, the raised portion 2032 is fixedly connected to the support portion 2022 of the support plate 202 . It can be understood that, the booster portion 2032 can be fixedly connected to the support portion 2022 of the support plate 202 through the cooperation of the screw and nut assemblies.

Please refer to FIG. 3 and FIG. 6 again. In a specific example, the test voltage transformer 100 further includes a locking plate 204. The locking plate 204 is provided with a locking slot 2041, and both ends of the locking plate 204 are fixed to The positioning plate 203 and the locking slot 2041 cover the surface of the humidity sensor 201 . The humidity sensor 201 can be more stably fixed on the positioning plate 203 by the arrangement of the locking plate 204 . Further, the position of the humidity sensor 201 can be further fixed by the clamping action of the locking groove 2041 . Specifically, both ends of the locking plate 204 are fixed on the raised portion 2032 of the positioning plate 203 . It can be understood that both ends of the locking plate 204 can be fixedly connected to the raised portion 2032 of the positioning plate 203 through the cooperation of the screw and nut assemblies.

In a specific example, the locking slot 2041 and the positioning slot 2031 are staggered. Further, the locking slot 2041 and the positioning slot 2031 are completely staggered.

Please refer to FIG. 1 to FIG. 3 again. In a specific example, the test voltage transformer 100 further includes a connecting flange 102. The connecting flange 102 is disposed on the outer edge of the through hole and is located outside the housing 101. The connecting flange 102 is fixedly connected to one end of the hollow connecting pipe 103 close to the casing 101 for fixing the hollow connecting pipe 103 to the casing 101 . The hollow connection pipe 103 can be connected to the outside of the housing 101 more conveniently by the arrangement of the connection flange 102 .

Further, the connecting flange 102 and the hollow connecting pipe 103 are integrally formed. The integrated structure of the connecting flange 102 and the hollow connecting pipe 103 is convenient for processing and forming, and can also effectively improve the air tightness between the connecting flange 102 and the hollow connecting pipe 103, and is also convenient for connecting with the shell 101 to improve the hollow connection. Air tightness between the tube 103 and the housing 101 .

In a specific example, one end of the hollow connecting pipe 103 close to the sealing flange 104 is provided with a fixing seat 1031 , and the fixing seat 1031 protrudes from the outer edge of the connecting pipe for connecting with the sealing flange 104 . The hollow connecting pipe 103 and the sealing flange 104 can be stably connected by the arrangement of the fixing seat 1031 , and then the hollow connecting pipe 103 and the sealing flange 104 can be fixedly connected. It can be understood that the fixing seat 1031 protrudes from the outer edge of the hollow connecting pipe 103 , and can be matched and connected with the sealing flange 104 more conveniently. Optionally, the outer diameter of the fixing seat 1031 is equal to the outer diameter of the sealing flange 104 .

Further, the fixing seat 1031 and the hollow connecting pipe 103 are integrally formed. The integrally formed structure of the fixed seat 1031 and the hollow connecting pipe 103 is convenient for processing and molding, and can also effectively improve the air tightness between the fixed seat 1031 and the hollow connecting pipe 103 , and is also convenient for connection with the sealing flange 104 to improve the housing 101 , the overall tightness of the hollow connecting pipe 103 , the fixed seat 1031 and the sealing flange 104 .

In a specific example, the outer diameter of the sealing flange 104 is smaller than the outer diameter of the connecting flange 102 . It can be understood that, the sealing flange 104 and the connecting flange 102 are both provided with a plurality of fixing holes for the fixing members to pass through. When the sealing flange 104 and the connecting flange 102 are installed, the connecting flange 102 is installed on the housing 101 by inserting a fixing member in the fixing hole, and the sealing flange 104 is installed on the housing 101 by inserting the fixing member in the fixing hole. on the connecting pipe. For the purpose of distinction, the fixing hole on the connecting flange 102 is the connecting flange fixing hole 1021 , and the fixing hole on the sealing flange 104 is the sealing flange fixing hole 1041 . It can be understood that the fixing member may be a screw rod, a screw, a pin or the like.

In a specific example, the connecting flange fixing holes 1021 on the connecting flange 102 are distributed around the center of the connecting flange 102 , and the sealing flange fixing holes 1041 on the sealing flange 104 are distributed around the center of the sealing flange 104 . Further, the connecting flange fixing holes 1021 on the connecting flange 102 are evenly distributed around the center of the connecting flange 102 , and the sealing flange fixing holes 1041 on the sealing flange 104 are evenly distributed around the center of the sealing flange 104 . Still further, the connecting flange fixing holes 1021 on the connecting flange 102 are even in number, and the sealing flange fixing holes 1041 on the sealing flange 104 are even in number. Still further, the number of the sealing flange fixing holes 1041 on the sealing flange 104 is twice the number of the connecting flange fixing holes 1021 on the connecting flange 102 . Still further, the distance between two adjacent sealing flange fixing holes 1041 on the sealing flange 104 is half the distance between the two adjacent connecting flange fixing holes 1021 on the connecting flange 102 . Furthermore, the connection flange fixing holes 1021 on the connection flange 102 are evenly distributed around the electrical connection terminals 105 , and the sealing flange fixing holes 1041 on the sealing flange 104 are evenly distributed around the electrical connection terminals 105 .

In the test voltage transformer 100 shown in FIG. 1 , the number of the connection flange fixing holes 1021 on the connection flange 102 is 4, and the number of the sealing flange fixing holes 1041 on the sealing flange 104 is 8. The four connecting flange fixing holes 1021 on the connecting flange 102 are evenly distributed around the electrical connection terminals 105 , and the eight sealing flange fixing holes 1041 on the sealing flange 104 are evenly distributed around the electrical connecting terminals 105 .

In a specific example, the length of the hollow connecting pipe 103 is 18 cm˜25 cm. Optionally, the length of the hollow connecting tube 103 is 18 cm, 19 cm, 20 cm, 21 cm, 22 cm, 23 cm, 24 cm or 25 cm. Preferably, the length of the hollow connecting pipe 103 is 20 cm. It can be understood that the length of the hollow connecting pipe 103 can be arbitrarily selected from the length ranges and length points listed above, that is, the length of the hollow connecting pipe 103 can be any length from 18cm to 25cm, and is not limited to 18cm. , 19cm, 20cm, 21cm, 22cm, 23cm, 24cm or 25cm.

Referring to FIG. 1 again, in a specific example, the adsorber 106 is closer to the top of the housing 101 than the through hole. Disposing the adsorber 106 on the top of the housing 101 is closer to the through hole, which facilitates the installation of the adsorber 106 and can effectively maintain the regularity of the installation of the test voltage transformer 100 . In addition, the adsorber 106 is closer to the top of the casing 101 than the through hole, and is located at a position inside the casing 101 where there are no other electrical components, so it does not interfere with the normal operation of other electrical components, and the function of the adsorber 106 is more fully exerted.

Referring to FIG. 1 again, in a specific example, the test voltage transformer 100 further includes an insulator 110 , and the insulator 110 is located on the top of the housing 101 . The insulator 110 is located on the top of the casing 101 to improve the insulation between the inside of the casing 101 and the external environment. Further, the insulator 110 is a pot insulator.

In a specific example, the test voltage transformer 100 further includes a shut-off valve 107 , the shut-off valve 107 is located outside the casing 101 , and the shut-off valve 107 is used to realize the penetration and isolation of the inside and the outside of the casing 101 . The setting of the shut-off valve 107 can be used to realize the addition or discharge of the SF ₆ gas inside the casing 101 . In addition, the shut-off valve 107 has good sealing performance, and can effectively maintain the sealing performance of the housing 101 .

It can be understood that the test voltage transformer 100 further includes a self-sealing joint 108 , and the self-sealing joint 108 is installed on the shut-off valve 107 . The arrangement of the self-sealing joint 108 can further improve the sealing performance of the shut-off valve 107 , and further, the test voltage transformer also includes a protective cap 109 . The protective cap 109 is arranged on the self-sealing joint 108 . The protective cap 109 can make the self-sealing joint 108 more stably installed on the shut-off valve 107 . It can be understood that the protective cap 109 can be, but is not limited to, a nut.

It can be understood that the test voltage transformer 100 also includes the indispensable electrical components of the voltage transformer, so as to better simulate the actual use of the voltage transformer.

It can also be understood that the test voltage transformer 100 further includes a plurality of connection components, such as screw and nut connection components, and the components that need to be connected in the test voltage transformer 100 are connected through the arrangement of the connection components.

The following are specific examples

Example 1

This embodiment adopts the test voltage transformer in FIG. 1 . During the detection, the reliability and accuracy of the detection data of the humidity sensor should be verified first, and the verification results are all qualified.

The SF ₆ gas of 0.52MPa is filled in the shell. The adsorbent was the KDHF-03 adsorbent used by Xi'an Xikai High Voltage Electric Co., Ltd., and the installed amount was 10% (0.34kg) of the gas weight. The adsorbent is placed in the adsorber, and the humidity inside the shell is detected by the humidity sensor. The control detection period is 10s, 30s, 1min, 5min, 10min, 30min, 1h and 2h. The testing period was more than 10 months (May 17, 2013 to April 10, 2014).

Comparative Example 1

Compared with Example 1, Comparative Example 1 differs in that no adsorbent is placed in the adsorber.

The variation data of the humidity inside the housing with time in Example 1 and Comparative Example 1 are shown in Table 1, and the comparison diagram of the variation relationship is shown in FIG. 7 . The graph of the relationship between the humidity inside the housing and the temperature in Example 1 is shown in FIG. 8 .

Table 1

It can be seen from Figure 7 and Figure 8 that:

(1) The initial humidity data inside the housing of Example 1 and Comparative Example 1 are similar, but the humidity of Example 1 dropped sharply, from the initial 110 μL/L to below 20 μL/L after five days, and basically stabilized at About 10μL/L, from June 25, 2013 to April 10, 2014, the humidity was stable between 6 and 11 μL/L. In contrast, the humidity inside the shell of Comparative Example 1 did not change much, but decreased slightly, from the initial 137.31 μL/L to about 110 μL/L, the air chamber temperature was between 19 and 29 °C, and the humidity was between 100 and 110 μL/L. between L. This shows that the adsorbent in Example 1 has better hygroscopic performance.

(2) The internal temperature of the shell has a great influence on the humidity. The internal temperature of the shell increases, and the humidity increases, especially when the humidity is high. Taking Example 1 as an example, when the temperature inside the casing is 9.2°C, the humidity is 60.11 μL/L. On the other hand, when the temperature inside the housing was 19.2°C, the humidity was 103 μL/L. The internal temperature of the housing increases by 10°C, and the humidity increases by 70%. Therefore, during the humidity test of the voltage transformer, the influence of temperature on the humidity should be fully considered. This also confirms that as the temperature rises, the moisture of the insulating material inside the housing will be released, resulting in an increase in humidity.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be based on the appended claims, and the description and drawings can be used to explain the content of the claims.

Claims (10)

1. a detection method of adsorbent moisture absorption performance in a voltage transformer, is characterized in that, comprises the steps: A test voltage transformer is provided, the test voltage transformer includes a housing, a humidity sensor and an adsorber, the humidity sensor and the adsorber are both arranged inside the housing, and the humidity sensor is used to detect the housing Humidity inside the body, the adsorber is used to place the adsorbent to be detected; The adsorbent to be detected is placed in the adsorber, the humidity inside the casing is detected by the humidity sensor, and the change relationship of the humidity inside the casing with time is recorded. 2 . The method for detecting the moisture absorption performance of an adsorbent in a voltage transformer according to claim 1 , wherein the humidity inside the casing is detected by the humidity sensor, and the detection period is controlled to be gradually extended. 3 . 3. The method for detecting the moisture absorption performance of an adsorbent in a voltage transformer according to claim 2, wherein the humidity inside the housing is detected by the humidity sensor, and the detection period is controlled to be more than 10s; and/ or, The humidity inside the casing is detected by the humidity sensor, and the detection period is controlled to be less than 2 hours. 4. The method for detecting the moisture absorption performance of an adsorbent in a voltage transformer according to claim 2, wherein the humidity inside the casing is detected by the humidity sensor, and the control detection period is 10s, 30s, 1min, 5min, 10min, 30min, 1h and 2h; and/or, The humidity inside the casing is detected by the humidity sensor, and the detection time is controlled to be more than 10 months. 5. The method for detecting moisture absorption performance of adsorbents in a voltage transformer according to any one of claims 1 to 4, wherein the testing voltage transformer further comprises a hollow connecting pipe, a support plate, a positioning plate, a sealing Flanges and electrical connection terminals; The casing is provided with a through hole, the hollow connecting pipe protrudes from the surface of the casing, and the cavity of the hollow connecting pipe communicates with the through hole; the support plate is fixed to the hollow Connect the inner wall of the pipe, the support plate is provided with a guide groove, the positioning plate is set in the guide groove, the humidity sensor is fixed on the positioning plate, and the positioning plate can move along the guide groove to use for driving the humidity sensor to move in the cavity of the hollow connecting pipe; The sealing flange is connected to one end of the hollow connecting pipe away from the casing for sealing the hollow connecting pipe; the electrical connecting terminal is arranged on the sealing flange, and the electrical connecting terminal has a functional end and a control end, the functional end protrudes into the cavity of the hollow connecting pipe, the control end protrudes in a direction away from the hollow connecting pipe, and the functional end is electrically connected with the humidity sensor , the control terminal is used for electrical connection with the external controller. 6 . The method for detecting the moisture absorption performance of an adsorbent in a voltage transformer according to claim 5 , wherein the adsorber is closer to the top of the housing than the through hole. 7 . 7 . The method for detecting the moisture absorption performance of an adsorbent in a voltage transformer according to claim 5 , wherein the support plate has a mounting portion and a support portion, and the mounting portion is fixed on the inner wall of the hollow connecting pipe, 8 . The support portion protrudes from the mounting portion for supporting the positioning plate, and the guide groove is provided on the support portion. 8 . The method for detecting moisture absorption performance of an adsorbent in a voltage transformer according to claim 7 , wherein the support portion is parallel to the axis of the hollow connecting pipe. 9 . 9 . The method for detecting the moisture absorption performance of an adsorbent in a voltage transformer according to claim 5 , wherein the positioning plate is provided with a positioning slot, and the humidity sensor is clamped in the positioning slot. 10 . 10 . The method for detecting the moisture absorption performance of an adsorbent in a voltage transformer according to claim 9 , wherein the groove wall of the positioning slot is perpendicular to the axis of the hollow connecting pipe. 11 .

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