Multifunctional detection device for main transformer installation

Abstract

The utility model discloses a multifunctional detection device for main transformer installation, and relates to the technical field of transformer substation construction. The multifunctional detection device for main transformer installation comprises a main detection pipeline, and a first branch detection pipeline and a second branch detection pipeline are arranged on the main detection pipeline. The first branch detection pipeline is provided with an electronic vacuum gauge and a first control valve used for controlling on-off of the first branch detection pipeline. And the second branch detection pipeline is provided with a pressure gauge and a second control valve used for controlling the on-off of the second branch detection pipeline. The multifunctional detection device for main transformer installation provided by the utility model has two functions of vacuum degree detection and pressure detection, and the two functions can be switched as required.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer substation construction, in particular to a multifunctional detection device for main transformer installation. Background Art

[0002] Due to transportation regulations (width and height restrictions), some accessories of the transformer need to be disassembled before being transported to the installation site, and then installed on site after arriving at the installation site. According to the national standard GB50148-2010 "Construction and Acceptance Specifications for Power Transformers, Oil-immersed Reactors and Transformers for Electrical Installation Engineering", when the accessories are installed in the open air of the transformer body of 220kV and above, the relative humidity of the environment should be less than 80%, and the continuous exposure time should not exceed 8 hours, and the cumulative exposure time should not exceed 24 hours.

[0003] In order to meet the above requirements, dry air with a dew point below -40°C is usually continuously added to the box during the installation process. After the installation is completed every day, the inside of the transformer needs to be vacuumed first, and then dry air is added to the transformer to ensure the dryness of the inside of the transformer.

[0004] When evacuating the transformer, a vacuum gauge needs to be installed on the detection port to detect the vacuum degree. However, since there is only one detection port on the transformer, and in order to maintain the vacuum degree in the transformer after evacuation, the vacuum gauge cannot be replaced with a pressure gauge, so when filling with dry gas after evacuation, the pressure in the transformer cannot be monitored. The pressure in the transformer can only be roughly judged based on the filling time, which can easily lead to overpressure and cracking of the oil tank, causing irreversible damage to the transformer. Utility Model Content

[0005] In response to the above problems, the present application provides a multifunctional detection device for main transformer installation, which has two functions: vacuum detection and pressure detection, and can be switched as needed.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A multifunctional detection device for main transformer installation, comprising a main detection pipeline, wherein a first detection pipeline and a second detection pipeline are arranged on the main detection pipeline;

[0008] The first detection pipeline is provided with an electronic vacuum gauge and a first control valve for controlling the on-off of the first detection pipeline;

[0009] The second detection pipeline is provided with a pressure gauge and a second control valve for controlling the on-off of the second detection pipeline.

[0010] Furthermore, a third detection pipeline is provided on the main detection pipeline, and a comparison vacuum gauge and a third control valve for controlling the on-off of the third detection pipeline are provided on the third detection pipeline.

[0011] Furthermore, the first detection pipeline and the second detection pipeline have the same orientation, and the third detection pipeline has an opposite orientation to the first detection pipeline and the second detection pipeline.

[0012] Furthermore, the third detection pipeline is located between the first detection pipeline and the second detection pipeline.

[0013] Furthermore, a fourth detection pipeline is arranged on the main detection pipeline, and a safety valve and a fourth control valve for controlling the on-off of the fourth detection pipeline are arranged on the fourth detection pipeline.

[0014] Furthermore, the first detection pipeline and the second detection pipeline have the same orientation, and the fourth detection pipeline has an opposite orientation to the first detection pipeline and the second detection pipeline.

[0015] Furthermore, the fourth detection pipeline is located on a side of the first detection pipeline away from the first detection pipeline.

[0016] Furthermore, a connecting flange is provided at the open end of the main detection pipeline.

[0017] Furthermore, the second detection pipeline is arranged at an end of the main detection pipeline away from the connecting flange.

[0018] The beneficial effects of the utility model are:

[0019] The embodiment of the present application provides a multifunctional detection device for main transformer installation, which can monitor the vacuum and pressure in the transformer, and can switch different detection modes as needed. In this way, when the transformer is evacuated, the vacuum in the transformer can be detected through the vacuum detection mode, and when the dry gas is filled into the transformer, it does not need to be disassembled, and can be directly switched to the pressure detection mode, so as to monitor the pressure in the transformer in real time, thereby preventing the transformer oil tank from being deformed and cracked due to excessive pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a multifunctional detection device for main transformer installation provided in an embodiment of the present application;

[0021] Figure 2 A front view of a multifunctional detection device for main transformer installation provided in an embodiment of the present application;

[0022] In the figure: 1. Main detection pipeline; 11. Connection flange;

[0023] 2. The first detection pipeline; 21. Electronic vacuum gauge; 22. The first control valve;

[0024] 3. The second detection pipeline; 31. The pressure gauge; 32. The second control valve;

[0025] 4. The third detection pipeline; 41. Comparative vacuum gauge; 42. The third control valve;

[0026] 5. The fourth detection pipeline; 51. Safety valve; 52. The fourth control valve. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the drawings in the embodiments of the present application, and the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by those skilled in the art without creative work on the basis of the embodiments of the present application shall belong to the protection scope of the present application.

[0028] For the convenience of description, the coordinate system is defined as Figure 1 As shown, the left-right direction is the horizontal direction, the front-back direction is the longitudinal direction, and the up-down direction is the vertical direction.

[0029] like Figure 1 and Figure 2 As shown, a multifunctional detection device for main transformer installation includes a main detection pipeline 1, one end of the main detection pipeline 1 is open and the other end is closed, and the open end of the main detection pipeline 1 is provided with a connecting flange 11. As a specific implementation, the connecting flange 11 in this embodiment is fixedly connected to the main detection pipeline 1 by welding.

[0030] The main detection pipeline 1 is provided with a first detection pipeline 2 and a second detection pipeline 3 connected to the main detection pipeline 1. An electronic vacuum gauge 21 is provided at the end of the first detection pipeline 2, and a first control valve 22 for controlling the on-off of the first detection pipeline 2 is provided on the first detection pipeline 2 between the electronic vacuum gauge 21 and the main detection pipeline 1. A pressure gauge 31 is provided at the end of the second detection pipeline 3, and a second control valve 32 for controlling the on-off of the second detection pipeline 3 is provided on the second detection pipeline 3 between the pressure gauge 31 and the main detection pipeline 1.

[0031] As a specific implementation, the second detection pipeline 3 described in this embodiment is arranged at an end of the main detection pipeline 1 away from the connecting flange 11, and the second detection pipeline 3 is connected to the main detection pipeline 1 through a connecting elbow.

[0032] When installing the transformer, the connecting flange 11 on the main detection pipeline 1 is sealed and fixed with the flange plate on the transformer detection port by bolts. After finishing a day's installation work, first open the first control valve 22 and close the second control valve 32. At this time, the electronic vacuum gauge 21 is in working state, and the pressure gauge 31 is in non-working state. Then evacuate the inside of the transformer. When the inside of the transformer reaches the preset vacuum degree, fill the inside of the transformer with dry air with a dew point lower than -40°C. With the filling of dry air, when the electronic vacuum gauge 21 shows that the inside of the transformer has returned to the standard atmospheric pressure, close the first control valve 22 and open the second control valve 32. At this time, the electronic vacuum gauge 21 is in non-working state, and the pressure gauge 31 is in working state, which can detect the pressure inside the transformer in real time. When the pressure gauge 31 shows that the pressure inside the transformer reaches the preset pressure value (usually 0.01MPa~0.03MPa), stop passing dry air.

[0033] The embodiment of the present application provides a multifunctional detection device for main transformer installation, which has the functions of vacuum detection and pressure detection, and can switch functions as needed. In this way, when installing the transformer, not only can the vacuum degree be detected during the vacuuming process, but also when the dry gas is filled into the transformer, it can be switched to the pressure detection mode, so as to monitor the pressure in the transformer in real time, thereby preventing the transformer oil tank from being deformed and cracked due to excessive pressure.

[0034] Since some sealing structures need to be disassembled and reinstalled during the installation of transformer accessories, the overall sealing will be affected. In order to ensure the good sealing of the final transformer, after the accessories are installed, the transformer needs to be evacuated for sealing test before the main transformer body is filled with oil. Usually, the vacuum degree is required to be 133Pa or below, and the vacuum degree needs to be measured on time (every half an hour). During the sealing test, the accuracy of vacuum degree detection is required to be high, and the electronic vacuum gauge 21 measures data intuitively, but it is easy to have data fluctuations, and it is impossible to accurately judge the vacuum degree in the transformer.

[0035] For this reason, Figure 1 and Figure 2As shown, the main detection pipeline 1 is provided with a third detection pipeline 4, and a comparison vacuum gauge 41 is provided at the end of the third detection pipeline 4. The third detection pipeline 4 is provided with a third control valve 42 for controlling the opening and closing of the third detection pipeline 4 between the comparison vacuum gauge 41 and the main detection pipeline 1.

[0036] When the vacuum is drawn for the sealing experiment, the first control valve 22 is always in the open state, so as to monitor the vacuum degree inside the transformer in real time. When it is necessary to read the vacuum degree inside the transformer, the third control valve 42 is opened, and the data measured by the electronic vacuum gauge 21 and the comparison vacuum gauge 41 are compared. If the readings of the two are consistent, the measured vacuum degree is recorded; if the readings of the two are inconsistent, the third control valve 42 is closed, and after waiting for a period of time, the third control valve 42 is opened again, and the comparison is performed again until the readings of the two are consistent.

[0037] By providing the comparative vacuum gauge 41, not only the accuracy of the vacuum degree measurement result in the transformer can be ensured, but also safety can be ensured, because the comparative vacuum gauge 41 is not always in the connected state, but is only turned on when taking measurement readings, thereby preventing the mercury in the comparative vacuum gauge 41 from being pressed into the transformer.

[0038] Furthermore, in order to further ensure the safety when filling with dry air, Figure 1 and Figure 2 As shown, the main detection pipeline 1 is provided with a fourth detection pipeline 5, and a safety valve 51 is provided at the end of the fourth detection pipeline 5. The fourth detection pipeline 5 is provided with a fourth control valve 52 between the safety valve 51 and the main detection pipeline 1 for controlling the on-off of the fourth detection pipeline 5.

[0039] In this way, when the pressure in the transformer is detected, the second control valve 32 and the fourth control valve 52 are opened at the same time. At this time, the pressure gauge 31 can detect the pressure in the transformer, and the safety valve 51 can ensure the pressure safety in the transformer. When the pressure is greater than the preset pressure, the safety valve 51 is pushed open, and the gas can be discharged through the safety valve 51, so that the pressure value in the transformer is maintained within the preset pressure range.

[0040] As a specific implementation, the third detection pipeline 4 described in this embodiment is located between the first detection pipeline 2 and the second detection pipeline 3, and the fourth detection pipeline 5 is located on the side of the first detection pipeline 2 close to the connecting flange 11. The first detection pipeline 2 and the second detection pipeline 3 face upward, and the third detection pipeline 4 and the fourth detection pipeline 5 face downward.

[0041] A multifunctional detection device for main transformer installation provided in an embodiment of the present application has the following working modes:

[0042] First, when vacuuming is performed before inflation, the first control valve 22 is opened, and the second control valve 32, the third control valve 42 and the fourth control valve 52 are closed.

[0043] Second, during inflation, before the pressure in the transformer returns to standard atmospheric pressure, the first control valve 22 is opened, and the second control valve 32, the third control valve 42, and the fourth control valve 52 are closed. After the pressure in the transformer returns to standard atmospheric pressure, the first control valve 22 and the third control valve 42 are closed, and the second control valve 32 and the fourth control valve 52 are opened.

[0044] Third, when performing the sealing test, the second control valve 32 and the fourth control valve 52 are closed, the first control valve 22 is opened, and the third control valve 42 is opened when it is necessary to compare the measurement data.

[0045] Other embodiments obtained by those skilled in the art by combining, splitting, reorganizing, etc. the embodiments of the present application on the basis of the embodiments provided in the present application do not exceed the protection scope of the present application.

[0046] The above specific implementation methods have detailed the purpose, technical solutions and beneficial effects of the embodiments of the present application. The above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. That is, any modifications, equivalent substitutions, improvements, etc. made on the basis of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A multifunctional detection device for main transformer installation, Features: It comprises a main detection pipeline (1), wherein the main detection pipeline (1) is provided with a first detection pipeline (2) and a second detection pipeline (3); The first detection pipeline (2) is provided with an electronic vacuum gauge (21) and a first control valve (22) for controlling the on-off of the first detection pipeline (2); The second detection pipeline (3) is provided with a pressure gauge (31) and a second control valve (32) for controlling the on-off of the second detection pipeline (3).

2. A multifunctional detection device for main transformer installation according to claim 1, Features: The main detection pipeline (1) is provided with a third detection pipeline (4), and the third detection pipeline (4) is provided with a comparative vacuum gauge (41) and a third control valve (42) for controlling the on-off of the third detection pipeline (4).

3. A multifunctional detection device for main transformer installation according to claim 2, Features: The first detection pipeline (2) and the second detection pipeline (3) have the same orientation, and the third detection pipeline (4) has an opposite orientation to the first detection pipeline (2) and the second detection pipeline (3).

4. A multifunctional detection device for main transformer installation according to claim 2, Features: The third detection pipeline (4) is located between the first detection pipeline (2) and the second detection pipeline (3).

5. A multifunctional detection device for main transformer installation according to claim 1, Features: The main detection pipeline (1) is provided with a fourth detection pipeline (5), and the fourth detection pipeline (5) is provided with a safety valve (51) and a fourth control valve (52) for controlling the on-off of the fourth detection pipeline (5).

6. A multifunctional detection device for main transformer installation according to claim 5, Features: The first detection pipeline (2) and the second detection pipeline (3) have the same orientation, and the fourth detection pipeline (5) has an orientation opposite to that of the first detection pipeline (2) and the second detection pipeline (3).

7. A multifunctional detection device for main transformer installation according to claim 5, Features: The fourth detection pipeline (5) is located on a side of the first detection pipeline (2) away from the first detection pipeline (2).

8. A multifunctional detection device for main transformer installation according to claim 1, Features: The open end of the main detection pipeline (1) is provided with a connecting flange (11).

9. A multifunctional detection device for main transformer installation according to claim 8, Features: The second detection pipeline (3) is arranged at an end of the main detection pipeline (1) away from the connecting flange (11).

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