CN114563530A - Method for detecting moisture absorption performance of absorbent in voltage transformer - Google Patents
Method for detecting moisture absorption performance of absorbent in voltage transformer Download PDFInfo
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- CN114563530A CN114563530A CN202210192895.8A CN202210192895A CN114563530A CN 114563530 A CN114563530 A CN 114563530A CN 202210192895 A CN202210192895 A CN 202210192895A CN 114563530 A CN114563530 A CN 114563530A
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000002745 absorbent Effects 0.000 title claims abstract description 14
- 239000002250 absorbent Substances 0.000 title claims abstract description 14
- 239000003463 adsorbent Substances 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims abstract description 49
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 230000008859 change Effects 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 56
- 239000006096 absorbing agent Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000012212 insulator Substances 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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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
Technical Field
The invention relates to the technical field of electrical elements, in particular to a method for detecting moisture absorption performance of an absorbent in a voltage transformer.
Background
The voltage transformer is an important component in a gas insulated totally-enclosed combined electrical apparatus (GIS), and is mainly used for transforming the voltage of electrical equipment, so that the voltage transformer has a good protection effect on the circuit of the electrical equipment, and the working stability of the electrical equipment is improved.
To maintain the performance of the voltage transformer, it is often necessary to add SF to the voltage transformer6A gas. SF6Gas can provide good insulating environment for the inside of the voltage transformer, and the problem of short circuit is avoided. But as the service life of the electrical equipment is prolonged, SF6The introduction of gas inevitably causes a problem that the humidity inside the voltage transformer becomes large. After humidity reaches a certain degree, the risk of the voltage transformer breaking down will be greatly increased.
In the use of the voltage transformer, in order to reduce the humidity inside the voltage transformer, the use of the adsorbent is a method with better effect. Through set up the adsorbent in voltage transformer, and then can adsorb the aqueous vapor in the voltage transformer, reduce the inside humidity of voltage transformer. However, regarding the performance detection of the adsorbent, the conventional method can only detect the self performance of the adsorbent, and it is difficult to detect the use performance of the adsorbent in the voltage transformer.
Disclosure of Invention
Therefore, a method for detecting the moisture absorption performance of the adsorbent in the voltage transformer is needed, so that the performance database of the adsorbent is enriched, and more bases are provided for the selection of the adsorbent.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for detecting the moisture absorption performance of an absorbent in a voltage transformer comprises the following steps:
providing a test voltage transformer, wherein the test voltage transformer comprises a shell, a humidity sensor and an absorber, the humidity sensor and the absorber are both arranged in the shell, the humidity sensor is used for detecting the humidity in the shell, and the absorber is used for placing an adsorbent to be detected;
and placing an adsorbent to be detected in the adsorber, detecting the humidity inside the shell through the humidity sensor, and recording the change relation of the humidity inside the shell along with time.
In one embodiment, the humidity sensor detects the humidity inside the shell, and the detection period is controlled to be gradually prolonged.
In one embodiment, the humidity inside the shell is detected by the humidity sensor, and the detection period is controlled to be more than 10 s; and/or the presence of a gas in the gas,
the humidity inside the shell is detected through the humidity sensor, and the detection period is controlled to be less than 2 h.
In one embodiment, the humidity inside the shell is detected by the humidity sensor, and the detection periods are controlled to be 10s, 30s, 1min, 5min, 10min, 30min, 1h and 2h in sequence; and/or the presence of a gas in the gas,
the humidity sensor is used for detecting the humidity in the shell, and the detection time is controlled to be more than 10 months.
In one embodiment, the test voltage transformer further comprises a hollow connecting pipe, a supporting plate, a positioning plate, a sealing flange and an electric connecting terminal;
the shell is provided with a through hole, the hollow connecting pipe extends out of the surface of the shell, and a cavity of the hollow connecting pipe is communicated with the through hole; the supporting plate is fixed on the inner wall of the hollow connecting pipe, a guide groove is formed in the supporting plate, the positioning plate is arranged in the guide groove, the humidity sensor is fixed on the positioning plate, and the positioning plate can move along the guide groove to drive 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, which is far away from the shell, so as to be used for sealing the hollow connecting pipe; electric connection terminal locates on the sealing flange, electric connection terminal has function end and control end, the function end stretches into in the cavity of cavity connecting pipe, the control end is followed and is kept away from the direction of cavity connecting pipe stretches out, the function end with humidity transducer electric connection, the control end be used for with external controller electric connection.
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 fixed to an inner wall of the hollow connection pipe and a support part extended from the installation part for supporting the positioning plate, and the guide groove is provided in the support part.
In one embodiment, the support is parallel to the axis of the hollow connecting tube.
In one embodiment, a positioning slot is arranged on the positioning plate, and the humidity sensor is clamped in the positioning slot.
In one embodiment, the groove wall of the positioning groove is perpendicular to the axis of the hollow connecting pipe.
The method for detecting the moisture absorption performance of the absorbent in the voltage transformer 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 moisture absorption performance 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 moisture absorption performance of the adsorbent is detected, the performance database of the adsorbent is enriched, and more bases are provided for the selection of the adsorbent. Further, in the detection process, when the humidity inside the shell is higher than the humidity threshold value, the moisture absorption performance of the adsorbent to be detected can be judged to be unqualified, and the adsorbent cannot be used in a voltage transformer. Namely, whether the adsorbent is available or not can be judged by adopting the detection method, and the unavailable adsorbent can be found in time.
Drawings
FIG. 1 is a schematic structural diagram of a test voltage transformer according to an embodiment of the present invention;
FIG. 2 is a top view of the test voltage transformer corresponding to FIG. 1;
FIG. 3 is an internal schematic view of a hollow connecting tube of the test potential transformer corresponding to FIG. 1;
fig. 4 is a schematic structural diagram of a supporting plate of the testing voltage transformer corresponding to fig. 1, wherein (a) is a front view and (b) is a bottom view;
fig. 5 is a schematic structural diagram of a positioning plate of the test voltage transformer corresponding to fig. 1, wherein (a) is a front view, and (b) is a bottom view;
fig. 6 is a schematic structural diagram of a locking plate of the test voltage transformer corresponding to fig. 1, wherein (a) is a front view and (b) is a bottom view;
FIG. 7 is a graph comparing the humidity inside the case of example 1 of the present invention and comparative example 1 with time;
fig. 8 is a graph showing the relationship between humidity and temperature inside the case in example 1 of the present invention.
The notation in the figure is:
100. testing the voltage transformer; 101. a housing; 102. a connecting flange; 1021. connecting flange fixing holes; 103. a hollow connecting pipe; 1031. a fixed seat; 104. sealing the flange; 1041. sealing the flange fixing hole; 105. an electrical connection terminal; 1051. a functional end; 106. an adsorber; 107. a stop valve; 108. a self-sealing joint; 109. a protective cap; 110. an insulator; 201. a humidity sensor; 202. a support plate; 2021. an installation part; 2022. a support portion; 20221. a guide groove; 203. positioning a plate; 2031. positioning a clamping groove; 2032. a raised portion; 204. a locking plate; 2041. and locking the clamping groove.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Unless defined otherwise, 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 terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the invention provides a method for detecting the moisture absorption performance of an absorbent in a voltage transformer. The detection method comprises the following steps: the testing voltage transformer 100 is provided, the testing voltage transformer 100 comprises a shell 101, a humidity sensor 201 and an adsorber 106, the humidity sensor 201 and the adsorber 106 are both arranged inside the shell 101, the humidity sensor 201 is used for detecting the humidity inside the shell 101, and the adsorber 106 is used for placing an adsorbent to be detected. 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. Further, in the detection process, when the humidity inside the shell is higher than the humidity threshold value, the moisture absorption performance of the adsorbent to be detected can be judged to be unqualified, and the adsorbent cannot be used in a voltage transformer. Namely, the detection method can also judge whether the adsorbent is available or not, and find the unavailable adsorbent in time.
In one embodiment, the control detection period is gradually extended. The detection period is controlled to be gradually prolonged, so that more stable detection humidity data can be obtained. It is understood that the detection period indicates a time interval between two adjacent detections.
Further, the humidity inside the casing is detected by a humidity sensor, and the detection cycle is controlled to be 10 seconds or more. If the detection period is too short, the detection frequency is too high, which may increase the load on the humidity sensor too much.
Still further, the humidity inside the casing is detected by a humidity sensor, and the detection period is controlled to be less than or equal to 2 h. If the detection period is too long, the detection data may not reflect the actual humidity change in the housing, and the detection accuracy may be reduced.
And further, detecting the humidity inside the shell through a humidity sensor, wherein the detection period is controlled to be 10s, 30s, 1min, 5min, 10min, 30min, 1h and 2h in sequence.
Furthermore, the humidity inside the casing is detected by a humidity sensor, and the detection time is controlled to be more than 10 months. The detection time is controlled to be more than 10 months, so that the detection data can cover four seasons of one year, and the real condition of the humidity in the shell can be reflected. Optionally, the time for detection is controlled to be more than 11 months. Optionally, the time for detection is controlled to be 12 months or more. It will be understood that the time of detection represents the time during which the humidity detection within the housing is continued.
It is understood that the following steps are also included before the humidity inside the housing is detected by the humidity sensor: and 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 checked by a measurement check unit.
It is also understood that the following steps are included before the humidity inside the housing is detected by the humidity sensor: and checking the accuracy of the detection data of the humidity sensor. For example, by comparing with the detection data of the off-line humidity sensor, the detection data deviation within ± 5% is considered to meet the accuracy requirement.
Please refer to fig. 1 to 6. In a specific example, the test voltage transformer further comprises a hollow connection tube 103, a support plate 202, an alignment plate 203, a sealing flange 104, and an electrical connection terminal 105. A through hole (not shown in the figure) is arranged on the shell 101, the hollow connecting pipe 103 extends out from the surface of the shell 101, and the cavity of the hollow connecting pipe 103 is communicated with the through hole; the supporting plate 202 is fixed on the inner wall of the hollow connecting pipe 103, the guiding groove 20221 is provided on the supporting plate 202, the positioning plate 203 is disposed in the guiding groove 20221, the humidity sensor 201 is fixed on the positioning plate 203, and the positioning plate 203 can move along the guiding groove 20221 to drive the humidity sensor 201 to move in the cavity of the hollow connecting pipe 103. A sealing flange 104 is connected to one end of the hollow connection pipe 103 away from the housing 101 for sealing the hollow connection pipe 103; the electrical connection terminal 105 is disposed on the sealing flange 104, the electrical connection terminal 105 has a function end 1051 and a control end (not shown in the figure), the function end 1051 extends into the cavity of the hollow connection pipe 103, the control end extends along a direction away from the hollow connection pipe 103, the function end 1051 is electrically connected to the humidity sensor 201, and the control end is used for electrically connecting to an external controller.
Referring to fig. 4 again, in a specific example, the supporting plate 202 has a mounting portion 2021 and a supporting portion 2022, the mounting portion 2021 is fixed to an inner wall of the hollow connecting tube 103, the supporting portion 2022 extends from the mounting portion 2021 for supporting the positioning plate 203, and the guiding groove 20221 is disposed on the supporting portion 2022. Further, the support portion 2022 is parallel to the axis of the hollow connection pipe 103. Through the installation of the installation part 2021, the support part 2022 can protrude out of the inner wall of the hollow connection pipe 103, so as to avoid interference with the inner wall of the hollow connection pipe 103, which is beneficial to improving the installation stability of the humidity sensor 201. Still further, the supporting portion 2022 is disposed perpendicular to the mounting portion 2021.
Specifically, the length of the guide groove 20221 is 75mm to 85 mm. Namely, the movement stroke of the positioning plate 203 along the guide groove 20221 is 75 mm-85 mm. Optionally, the length of the guide groove 20221 is 75mm, 76mm, 77mm, 78mm, 79mm, 80mm, 81mm, 82mm, 83mm, 84mm, or 85 mm.
Referring to fig. 5 again, in a specific example, a positioning slot 2031 is disposed on the positioning plate 203, and the humidity sensor 201 is clamped in the positioning slot 2031. The humidity sensor 201 can be more stably mounted on the positioning plate 203 by the positioning slot 2031. Further, the groove wall of the positioning groove 2031 is perpendicular to the axis of the hollow connection pipe 103. This further maintains the parallel arrangement of the humidity sensor 201 and the inner wall of the hollow connection pipe 103, and the movement of the humidity sensor 201 is smoother.
In one specific example, the locator card slot 2031 extends into the interior of the housing 101, and the sensing end of the humidity sensor 201 is snapped into the locator card slot 2031. At this time, the humidity sensor 201 can directly detect the humidity information inside the casing 101.
Referring to fig. 5 again, in a specific example, the positioning plate 203 has a raised portion 2032, and the raised portion 2032 is connected to the supporting plate 202 for protruding the positioning slot 2031 from the supporting plate 202. The positioning clamping groove 2031 can protrude out of the support plate 202 due to the arrangement of the raised portion 2032, so that collision and interference between the humidity sensor 201 and components in the hollow connecting pipe 103 during movement can be effectively avoided. Further, the raised portion 2032 is fixedly connected to the support portion 2022 of the support plate 202. It is understood that the raised portion 2032 can be fixedly attached to the support portion 2022 of the support plate 202 by the engagement of the screw nut assembly.
Referring to fig. 3 and fig. 6 again, in a specific example, the testing voltage transformer 100 further includes a locking plate 204, the locking plate 204 is provided with a locking slot 2041, two ends of the locking plate 204 are fixed to the positioning plate 203, and the locking slot 2041 is covered on 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 clamping groove 2041. Specifically, both ends of the locking plate 204 are fixed to the raised portions 2032 of the positioning plate 203. It will be appreciated that the two ends of the locking plate 204 may be fixedly attached to the raised portion 2032 of the positioning plate 203 by the engagement of the screw and nut assemblies.
In one particular example, locking card slot 2041 is offset from locator card slot 2031. Further, the locking groove 2041 and the positioning groove 2031 are completely staggered.
Referring to fig. 1 to 3 again, in a specific example, the testing voltage transformer 100 further includes a connecting flange 102, the connecting flange 102 is disposed at an outer edge of the through hole and located outside the housing 101, and the connecting flange 102 is fixedly connected to an end of the hollow connecting pipe 103 close to the housing 101 for fixing the hollow connecting pipe 103 to the housing 101. The hollow connection pipe 103 can be more conveniently connected to the outside of the housing 101 by the provision of the connection flange 102.
Further, the connecting flange 102 and the hollow connecting pipe 103 are integrally formed. The integrally formed structure of the connecting flange 102 and the hollow connecting pipe 103 is convenient for processing and forming, can also effectively improve the air tightness between the connecting flange 102 and the hollow connecting pipe 103, is also convenient for being connected with the shell 101, and improves the air tightness between the hollow connecting pipe 103 and the shell 101.
In a specific example, a fixing seat 1031 is provided at one end of the hollow connecting pipe 103 close to the sealing flange 104, and the fixing seat 1031 protrudes from the outer edge of the connecting pipe for connecting with the sealing flange 104. The hollow connection pipe 103 and the sealing flange 104 can be stably connected by the fixing seat 1031, and then the hollow connection pipe 103 and the sealing flange 104 are fixedly connected. It can be understood that the fixing seat 1031 protrudes from the outer edge of the hollow connection pipe 103, and can be more conveniently matched and connected with the sealing flange 104. Optionally, the fixed seat 1031 has an outer diameter equal to the outer diameter of the sealing flange 104.
Further, the fixing seat 1031 and the hollow connection pipe 103 are integrally formed. The fixing seat 1031 and the hollow connecting pipe 103 are integrally formed, so that the structure is convenient to machine and form, the air tightness between the fixing seat 1031 and the hollow connecting pipe 103 can be effectively improved, the fixing seat 1031 and the hollow connecting pipe 103 are also convenient to connect with the sealing flange 104, and the overall sealing performance of the shell 101, the hollow connecting pipe 103, the fixing seat 1031 and the sealing flange 104 is improved.
In one particular example, the outer diameter of the sealing flange 104 is less than the outer diameter of the attachment flange 102. It will be appreciated that a plurality of fastening holes are provided in both the sealing flange 104 and the attachment flange 102 for fasteners to pass through. When the sealing flange 104 and the connection flange 102 are mounted, the connection flange 102 is mounted on the housing 101 by inserting a fixing member into a fixing hole, and the sealing flange 104 is mounted on the connection pipe by inserting a fixing member into a fixing hole. For the purpose of differentiation, the fastening holes on the connecting flange 102 are connecting flange fastening holes 1021, and the fastening holes on the sealing flange 104 are sealing flange fastening holes 1041. It will be appreciated that the fixing may be a screw, pin, etc.
In one particular example, attachment flange attachment holes 1021 in attachment flange 102 are distributed around the center of attachment flange 102 and sealing flange attachment holes 1041 in sealing flange 104 are distributed around the center of sealing flange 104. Further, the attachment flange fixing holes 1021 on the attachment flange 102 are evenly distributed around the center of the attachment 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, there are an even number of connecting flange fixing holes 1021 on the connecting flange 102, and an even number of sealing flange fixing holes 1041 on the sealing flange 104. Still further, the number of sealing flange fixing holes 1041 on the sealing flange 104 is 2 times the number of 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 of the distance between two adjacent connecting flange fixing holes 1021 on the connecting flange 102. Still further, 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 in the connection flange 102 is 4, and the number of the sealing flange fixing holes 1041 in the sealing flange 104 is 8. The 4 connection flange fixing holes 1021 on the connection flange 102 are evenly distributed around the electrical connection terminal 105, and the 8 sealing flange fixing holes 1041 on the sealing flange 104 are evenly distributed around the electrical connection terminal 105.
In a specific example, the hollow connection tube 103 has a length of 18cm to 25 cm. Optionally, the length of the hollow connecting tube 103 is 18cm, 19cm, 20cm, 21cm, 22cm, 23cm, 24cm or 25 cm. Preferably, the length of the hollow connection tube 103 is 20 cm. It will be appreciated that the length of hollow connector 103 may be selected from any of the length ranges and length point values listed above, i.e., the length of hollow connector 103 may be any of 18cm to 25cm, and is not limited to 18cm, 19cm, 20cm, 21cm, 22cm, 23cm, 24cm or 25 cm.
Referring again to FIG. 1, in one specific example, the adsorber 106 is closer to the top of the housing 101 than the through-holes. The adsorber 106 is arranged at the top, which is closer to the shell 101 than the through hole, so that the adsorber 106 can be conveniently installed, and the installation regularity of the test voltage transformer 100 can be effectively maintained. In addition, the adsorber 106 is closer to the top of the housing 101 than the through hole, and is located at a position where there is no other electrical component inside the housing 101, so as not to interfere with the normal operation of the other electrical component, and to fully perform the function of the adsorber 106.
Referring again to fig. 1, in one specific example, the testing voltage transformer 100 further includes an insulator 110, and the insulator 110 is located on the top of the housing 101. Insulator 110 is located on top of housing 101 for improving insulation of the interior of housing 101 from the external environment. Further, the insulator 110 is a basin insulator.
In a specific example, the test voltage transformer 100 further comprises a stop valve 107, the stop valve 107 is located outside the housing 101, and the stop valve 107 is used for achieving penetration and isolation between the inside and the outside of the housing 101. The arrangement of the shut-off valve 107 can be used to realize the SF inside the housing 1016Gas addition or removal. In addition, the shutoff valve 107 has good sealing performance, and can effectively maintain the sealing performance of the housing 101.
It will be appreciated that the test voltage transformer 100 also includes a self-sealing fitting 108, the self-sealing fitting 108 being mounted on the shut-off valve 107. The arrangement of the self-sealing joint 108 can further improve the sealing performance of the stop valve 107, and further, the test voltage transformer further comprises a protective cap 109. The protective cap 109 is disposed on the self-sealing joint 108. The protective cap 109 can make the self-sealing joint 108 more stably mounted on the shut-off valve 107. It is understood that the protective cap 109 may be, but is not limited to, a nut.
It will be appreciated that the test voltage transformer 100 also includes electrical components that are indispensable to the voltage transformer for better simulating the real use of the voltage transformer.
It will also be appreciated that the test voltage transformer 100 further includes a plurality of connection assemblies, such as screw and nut connection assemblies, which are arranged to connect components of the test voltage transformer 100 that require connection.
The following are specific examples
Example 1
The present embodiment employs the test voltage transformer of fig. 1. During detection, the reliability and the accuracy of the detection data of the humidity sensor are firstly verified, and the verification results are all qualified.
SF of 0.52MPa is filled in the shell6A gas. The adsorbent is KDHF-03 type adsorbent used by high-voltage electrical products of Siansi Kai, and the installation amount is 10 percent (0.34kg) of the gas weight. The adsorbent is placed in an adsorber, the humidity inside the shell is detected through a humidity sensor, and the detection period is controlled to be 10s, 30s, 1min, 5min, 10min, 30min, 1h and 2h in sequence. The detection time is more than 10 months (5 months in 2013)Day 17 to 4 months and 10 days 2014).
Comparative example 1
Comparative example 1 differs from example 1 in that no adsorbent is placed in the adsorber.
The change data of humidity inside the case with time in example 1 and comparative example 1 are shown in table 1, and the comparative graph of the change relationship is shown in fig. 7. The graph of humidity versus temperature for the interior of the case in example 1 is shown in fig. 8.
TABLE 1
As can be seen from fig. 7 and 8:
(1) the initial humidity data of the interior of the shell of the embodiment 1 and the initial humidity data of the interior of the shell of the comparative example 1 are similar, but the humidity of the embodiment 1 is sharply reduced, the humidity is reduced to below 20 mu L/L from the initial 110 mu L/L after five days, the humidity is basically stabilized to about 10 mu L/L after one month, and the humidity is stabilized to 6-11 mu L/L between 6 and 25 days in 2013 and 4 and 10 days in 2014. The humidity inside the shell of the comparative example 1 is not changed greatly and is slightly reduced, the initial humidity is reduced from 137.31 mu L/L to about 110 mu L/L, the temperature of the air chamber is between 19 and 29 ℃, and the humidity is between 100 and 110 mu L/L. This shows that the adsorbent of example 1 has better hygroscopic properties.
(2) The influence of the temperature inside the shell on the humidity is large, the temperature inside the shell is increased, the humidity is increased, and the humidity is particularly obvious when the humidity is large. Taking example 1 as an example, the humidity was 60.11 μ L/L when the temperature inside the case was 9.2 ℃. And when the temperature inside the shell is 19.2 ℃, the humidity is 103 mu L/L. The temperature inside the shell is increased by 10 ℃ and the humidity is increased by 70%. Therefore, the influence of temperature on humidity should be fully considered when testing the humidity of the voltage transformer. This also proves that the temperature rises and moisture in the insulating material inside the housing is released, which leads to an increase in humidity.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims, and the description and the drawings can be used for explaining the contents of the claims.
Claims (10)
1. A method for detecting the moisture absorption performance of an absorbent in a voltage transformer is characterized by comprising the following steps:
providing a testing voltage transformer, wherein the testing voltage transformer comprises a shell, a humidity sensor and an absorber, the humidity sensor and the absorber are both arranged in the shell, the humidity sensor is used for detecting the humidity in the shell, and the absorber is used for placing an adsorbent to be detected;
and placing an adsorbent to be detected in the adsorber, detecting the humidity inside the shell through the humidity sensor, and recording the change relation of the humidity inside the shell along with time.
2. The method for detecting moisture absorption performance of an adsorbent in a voltage transformer as claimed in claim 1, wherein the humidity inside said case is detected by said humidity sensor, and the detection period is controlled to be gradually extended.
3. The method for detecting the moisture absorption performance of the absorbent in the voltage transformer as claimed in claim 2, wherein the humidity inside the case is detected by the humidity sensor, and the detection period is controlled to be 10s or more; and/or the presence of a gas in the gas,
the humidity inside the shell is detected through the humidity sensor, and the detection period is controlled to be less than 2 h.
4. The method for detecting the moisture absorption performance of the absorbent in the voltage transformer as claimed in claim 2, wherein the humidity inside the shell is detected by the humidity sensor, and the detection periods are controlled to be 10s, 30s, 1min, 5min, 10min, 30min, 1h and 2h in sequence; and/or the presence of a gas in the atmosphere,
the humidity inside the shell is detected through the humidity sensor, and the detection time is controlled to be more than 10 months.
5. The method for detecting the moisture absorption performance of the absorbent in the voltage transformer as claimed in any one of claims 1 to 4, wherein the test voltage transformer further comprises a hollow connecting pipe, a supporting plate, a positioning plate, a sealing flange and an electrical connecting terminal;
the shell is provided with a through hole, the hollow connecting pipe extends out of the surface of the shell, and a cavity of the hollow connecting pipe is communicated with the through hole; the supporting plate is fixed on the inner wall of the hollow connecting pipe, a guide groove is formed in the supporting plate, the positioning plate is arranged in the guide groove, the humidity sensor is fixed on the positioning plate, and the positioning plate can move along the guide groove to drive 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, which is far away from the shell, so as to be used for sealing the hollow connecting pipe; electric connection terminal locates on the sealing flange, electric connection terminal has function end and control end, the function end stretches into in the cavity of cavity connecting pipe, the control end is followed and is kept away from the direction of cavity connecting pipe stretches out, the function end with humidity transducer electric connection, the control end be used for with external controller electric connection.
6. The method for detecting moisture absorption performance of an adsorbent in a voltage transformer as claimed in claim 5, wherein said adsorber is located closer to the top of said case than said through hole.
7. The method for detecting moisture absorption performance of an absorbent in a voltage transformer as claimed in claim 5, wherein the supporting plate has a mounting portion fixed to an inner wall of the hollow connecting tube and a supporting portion extended from the mounting portion for supporting the positioning plate, and the guide groove is provided in the supporting portion.
8. The method for detecting moisture absorption performance of an adsorbent in a voltage transformer as claimed in claim 7, wherein said supporting portion is parallel to an axis of said hollow connection pipe.
9. The method for detecting the moisture absorption performance of the absorbent in the voltage transformer as claimed in claim 5, wherein a positioning slot is arranged on the positioning plate, and the humidity sensor is clamped in the positioning slot.
10. The method for detecting the moisture absorption performance of the absorbent in the voltage transformer as claimed in claim 9, wherein the groove wall of the positioning groove is perpendicular to the axis of the hollow connection pipe.
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| CN114563530B (en) | 2023-07-07 |
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