A transformer gas automatic collection detection box and its use method

Abstract

The invention discloses a transformer gas automatic gas collection detection box and a method for using the same. The transformer gas automatic gas collection detection box comprises a gas collection box, a detection chamber and an electric control box; the left side of the electric control box is connected to the right side of the gas collection box, and the top of the electric control box is connected to the bottom of the detection chamber; the invention uses a cavity to place transformer oil and collect light gas, uses a vacuum pump to draw out the air in the cavity and a gas storage tank, and then uses a high-precision sensor to detect the light gas flowing into the negative pressure gas storage tank, transmits the detection result to a control screen for display, and simultaneously connects the gas storage tank to the vacuum pump through a connecting pipe C equipped with an electromagnetic valve C, replaces the light gas in the gas storage tank for a second group of detection, and uses an integrated processor to determine whether a transformer failure occurs based on the average value of the two groups of data. The entire process uses automatic control detection to replace traditional manual detection, thereby improving the safety factor of the staff.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer detection, and in particular relates to a transformer gas automatic collection detection box and a use method thereof. Background Art

[0002] The gas relay of the transformer body is equipped with a gas collecting box to collect light gas. Personnel need to go to the transformer to drain the oil on the gas collecting box to draw down the gas, visually observe the gas volume and color, and then take the gas. By igniting the gas, it is preliminarily judged whether the transformer is faulty. The detection method is not accurate and there are safety hazards. If it is not possible to judge whether the transformer is faulty by igniting the gas, it is necessary to further perform chromatographic analysis on the gas sample. The whole process is all manual sampling and detection, which is complicated to operate and inconvenient to carry multiple tools. Moreover, if there is a fault in the transformer, personnel take gas next to the transformer. Once an explosion occurs, it will directly endanger personal safety. Therefore, on December 12, 2019, China Southern Power Grid Co., Ltd. issued the "Notice on Printing and Distributing Temporary Control Measures for Transformer Light Gas Alarm Risks", requiring 500kV transformers and high-voltage reactors to be shut down for gas extraction. Although there is no rigid requirement for 110kV and 220kV transformers, there is also such a risk. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides an automatic detection gas collecting box to replace the manual inspection of light gas in the transformer. The average value of two sets of data is taken for intelligent judgment and intuitive display. The staff can directly know whether the transformer has a fault. At the same time, the personal risk of the staff going to the transformer to take gas is reduced. The operation is simple and easy to carry.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows:

[0005] A transformer gas automatic gas collection detection box comprises a gas collection box, a detection chamber and an electric control box; the left side of the electric control box is connected to the right side of the gas collection box, and the top of the electric control box is connected to the bottom of the detection chamber;

[0006] The gas collecting box is hollow inside, and a cavity for collecting transformer oil and light gas is provided in the hollow part. A pressure sensor is installed on one side of the cavity, and an opening is provided on the top of the cavity, and a gas collecting box cover is installed on the opening; an oil and gas delivery pipe connected to the cavity is provided on the top of the gas collecting box cover; an electromagnetic valve A is installed on the oil and gas delivery pipe; a manual gas extraction valve connected to the cavity is provided on the top of the gas collecting box cover;

[0007] The detection chamber comprises a base, a cover and a shield; the shield, the cover and the base are hollow inside and are sealed and connected in sequence from top to bottom; a data processor is installed in the shield; a high-precision sensor is installed in the cover; an air storage tank is installed in the base; the detection probe of the high-precision sensor extends into the air storage tank; the air storage tank is connected to the cavity through a connecting pipe A;

[0008] The electric control box is hollow inside, and an integrated processor, a power supply and a vacuum pump are installed in the hollow part from top to bottom in sequence. A control panel is provided on the surface of the electric control box; the vacuum pump is connected to a tee A installed on the oil and gas delivery pipe through a connecting pipe B, the tee A is placed at the lower end of the solenoid valve A, and the connecting pipe B near one end of the vacuum pump is installed with a solenoid valve B, a tee B is provided between the solenoid valve B and the vacuum pump, and the tee B is connected to the gas storage tank through a connecting pipe C; the connecting pipe C is installed with a solenoid valve C;

[0009] The power supply is electrically connected to the solenoid valve A, the control panel, the data processor, the high-precision sensor, the integrated processor, the vacuum pump, the solenoid valve B, the solenoid valve C and the air pressure sensor respectively; the data processor is electrically connected to the high-precision sensor and the air pressure sensor respectively; the integrated processor is electrically connected to the control panel, the data processor, the solenoid valve A, the vacuum pump, the solenoid valve B and the solenoid valve C respectively.

[0010] A small amount of transformer oil inside the transformer and overflowing light gas enter the gas collecting box and the detection room through the oil and gas transport pipe. When the transformer gives a light alarm, the transformer oil automatically discharged into the gas collecting box draws down the light gas. The high-precision sensor automatically measures the contents of nine gases, including H2, CO, CO2, CH4, C2H6, C2H4, C2H2, O2, and N2. The data is uploaded to the data processor and transmitted to the control screen for reference after analysis. The manual gas valve is used to collect gas samples. When chromatographic analysis is required, the manual gas valve is directly opened to take gas.

[0011] As a further technical improvement, the bottom of the gas collecting box is provided with an oil drain valve connected to the bottom of the cavity; the top of the gas collecting box cover is provided with a pressure reducing valve connected to the cavity. When the transformer oil in the cavity accumulates a lot, the pressure reducing valve and the oil drain valve are opened successively, and the transformer oil can be discharged more smoothly.

[0012] As a further technical improvement, a filter is provided at one end of the connecting pipe A near the gas collecting box. Since the transformer oil and light gas entering the cavity in a negative pressure state will be pressurized to form an oil-gas mixture, the filter is added at the connecting pipe A to filter out the transformer oil and prevent the transformer oil from entering the gas storage tank and contacting the detection probe of the high-precision sensor to affect the detection accuracy.

[0013] As a further technical improvement, the gas collecting box is provided with an observation window for observing the amount of transformer oil in the cavity.

[0014] As a further technical improvement, the outer sides of the electric control box and the gas collecting box are provided with carrying slots.

[0015] As a further technical improvement, a handle is provided in the middle of the top of the electric control box.

[0016] A method for using a transformer gas automatic gas collection detection box:

[0017] S1. Close all solenoid valves before use and connect the oil and gas delivery pipe to the connection port of the transformer;

[0018] S2. Operate the control panel to start gas detection, open solenoid valve B and solenoid valve C, and start the vacuum pump to evacuate the cavity, gas storage tank and corresponding pipelines in the gas collecting box; the air pressure sensor transmits the pressure data to the data processor in real time, and then transmits it to the integrated processor to analyze and determine whether the cavity has reached a vacuum state, and displays the air pressure data on the control panel in real time; after reaching the vacuum state, solenoid valve B and solenoid valve C are closed, the vacuum pump is turned off, and the action is stopped, so that the cavity of the gas collecting box and the gas storage tank in the detection room form a vacuum state without gas;

[0019] S3, the integrated processor controls to open the solenoid valve A, allowing a small amount of transformer oil and overflowing light gas inside the transformer to enter the gas collecting box through the oil and gas transport pipe; after the air pressure sensor detects that the air pressure in the cavity of the gas collecting box is normal, the high-precision sensor starts to detect the light gas flowing into the gas storage tank, the data processor converts the detection result, the integrated processor analyzes the result, and finally displays the first measurement result through the control screen;

[0020] S4, the integrated processor controls the vacuum pump to start, opens the solenoid valve C2 seconds later and then closes it, replaces the light gas in the gas storage tank, and the high-precision sensor detects again. The data processor converts the detection result, and the integrated processor analyzes the result. The second detection result is displayed on the control screen. The integrated processor combines the average value of the two measurement results to determine whether the transformer is faulty;

[0021] S5. If it is necessary to further confirm whether the transformer is faulty, after the air pressure value in the cavity of the gas collecting box is normal, the staff will take out the air through the manual air valve and test it to obtain the corresponding results;

[0022] S6. The cavity needs to be drained regularly through the oil drain valve.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] 1. The present invention uses a cavity to place transformer oil and collect light gas, uses a vacuum pump to extract the air in the cavity and the gas storage tank, and then uses a high-precision sensor to detect the light gas flowing into the negative pressure gas storage tank, and transmits the detection result to the control screen for display. At the same time, the gas storage tank is connected to the vacuum pump through a connecting pipe C equipped with an electromagnetic valve C, and the light gas in the gas storage tank is replaced to perform a second group of detection. The integrated processor combines the average value of the two groups of data to determine whether the transformer fails. The whole process adopts automatic control detection to replace traditional manual detection, thereby improving the safety factor of the staff.

[0025] 2. The present invention provides an air pressure sensor for detecting the air pressure in the cavity to control the appropriate state of detection and improve the accuracy of detection.

[0026] 3. The present invention adds a vacuum pump to extract the air in the gas collecting box and the detection chamber in advance, which can not only form a negative pressure state in the gas collecting box, the detection chamber and the corresponding pipelines, allowing light gas to enter more fully, but also remove the air therein, thereby improving the detection accuracy.

[0027] 4. The present invention adds a carrying slot or a handle to the electric control box, making the entire device more convenient to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0030] Figure 3 It is a schematic diagram of the handle position structure of the present invention.

[0031] Figure ID:

[0032] 1-Oil and gas delivery pipe, 2-Solenoid valve A, 3-Tee A, 4-Gas collecting box cover, 5-Gas collecting box, 51-Observation window, 52-Air pressure sensor, 6-Manual gas extraction valve, 7-Connecting pipe A, 71-Filter, 8-Shield, 9-Cover, 10-Base, 101-Gas storage tank, 11-Electric control box, 111-Handle slot, 112-Handle, 12-Control panel, 13-Oil drain valve, 14-Data processor, 15-High-precision sensor, 16-Integrated processor, 17-Power supply, 18-Vacuum pump, 19-Solenoid valve B, 20-Solenoid valve C. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] Embodiment 1:

[0035] A transformer gas automatic gas collection detection box, comprising a gas collection box 5, a detection chamber and an electric control box 11; the left side of the electric control box 11 is connected to the right side of the gas collection box 5, and the top of the electric control box 11 is connected to the bottom of the detection chamber;

[0036] The gas collecting box 5 is hollow inside, and a cavity for collecting transformer oil and light gas is provided in the hollow part. A pressure sensor 52 is installed on one side of the cavity. An opening is provided on the top of the cavity, and a gas collecting box cover 4 is installed at the opening. An oil and gas delivery pipe 1 communicating with the cavity is provided on the top of the gas collecting box cover 4. A solenoid valve A2 is installed on the oil and gas delivery pipe 1. A manual gas extraction valve 6 communicating with the cavity is provided on the top of the gas collecting box cover 4.

[0037] The detection chamber includes a base 10, a cover 9 and a shield 8; the shield 8, the cover 9 and the base 10 are hollow inside and are sealed and connected in sequence from top to bottom; a data processor 14 is installed in the shield 8; a high-precision sensor 15 is installed in the cover 9; an air storage tank 101 is installed in the base 10; the detection probe of the high-precision sensor 15 extends into the air storage tank 101; the air storage tank 101 is connected to the cavity through a connecting pipe A7;

[0038] The electric control box 11 is hollow inside, and an integrated processor 16, a power supply 17 and a vacuum pump 18 are installed in the hollow part from top to bottom. A control panel 12 is provided on the surface of the electric control box 11; the vacuum pump 18 is connected to a tee A3 installed on the oil and gas delivery pipe 1 through a connecting pipe B, the tee A3 is placed at the lower end of the solenoid valve A2, and a solenoid valve B19 is installed on the connecting pipe B near one end of the vacuum pump 18, a tee B is provided between the solenoid valve B19 and the vacuum pump 18, and the tee B is connected to the gas storage tank 101 through a connecting pipe C; the connecting pipe C is installed with a solenoid valve C20;

[0039] The power supply 17 is electrically connected to the electromagnetic valve A2, the control panel 12, the data processor 14, the high-precision sensor 15, the integrated processor 16, the vacuum pump 18, the electromagnetic valve B19, the electromagnetic valve C20 and the air pressure sensor 52; the data processor 14 is electrically connected to the high-precision sensor 15 and the air pressure sensor 52; the integrated processor 16 is electrically connected to the control panel 12, the data processor 14, the electromagnetic valve A2, the vacuum pump 18, the electromagnetic valve B19 and the electromagnetic valve C20. A small amount of transformer oil and overflowing light gas in the transformer enter the gas collecting box 5 and the detection room through the oil and gas transportation pipe 1. The transformer generates a light alarm, and the transformer oil automatically discharged into the gas collecting box 5 leads down the light gas. The high-precision sensor 15 automatically measures the content of 9 gases such as H2, CO, CO2, CH4, C2H6, C2H4, C2H2, O2, and N2. The data is uploaded to the data processor 14, and the results after analysis are transmitted to the control panel 12 for reference by the staff. The manual gas extraction valve 6 is used to collect gas samples. When chromatographic analysis is required, the manual gas extraction valve 6 is directly opened to extract gas.

[0040] The method of using this embodiment is as follows:

[0041] S1. Close each solenoid valve before use and connect the oil and gas delivery pipe 1 to the connection port of the transformer;

[0042] S2. Operate the control panel to start gas detection, open the solenoid valve B19 and the solenoid valve C20, start the vacuum pump 18 to evacuate the cavity, the gas storage tank 101 and the corresponding pipelines in the gas collecting box 5; the air pressure sensor 52 transmits the pressure data to the data processor 14 in real time, and then transmits it to the integrated processor 16 to analyze and determine whether the cavity has reached a vacuum state, and displays the air pressure data on the control panel in real time; after reaching the vacuum state, the solenoid valve B19 and the solenoid valve C20 are closed, and the vacuum pump 18 is closed and stopped, so that the cavity of the gas collecting box 5 and the gas storage tank 101 in the detection room form a vacuum state without gas;

[0043] S3, the integrated processor 16 controls the opening of the solenoid valve A2, allowing a small amount of transformer oil and overflowing light gas inside the transformer to enter the gas collecting box 5 through the oil and gas transport pipe 1; after the air pressure sensor 52 detects that the air pressure in the cavity of the gas collecting box 5 is normal, the high-precision sensor 15 starts to detect the light gas flowing into the gas storage tank 101, the data processor 14 converts the detection result, the integrated processor 16 analyzes the result, and finally displays the first measurement result through the control screen 12;

[0044] S4, the integrated processor 16 controls the vacuum pump 18 to start, opens the solenoid valve C202 seconds and then closes it, replaces the light gas in the gas storage tank 101, and the high-precision sensor 15 detects again. The data processor 14 converts the detection result, and the integrated processor 16 analyzes the result. The second detection result is displayed on the control screen 12. The integrated processor 16 combines the average value of the two measurement results to determine whether the transformer is faulty;

[0045] S5. If it is necessary to further confirm whether the transformer is faulty, after the air pressure value in the cavity of the air collecting box 5 is normal, the staff will take out air through the manual air taking valve 6 and test to obtain the corresponding results;

[0046] S6. The cavity needs to be drained regularly through the oil drain valve 13.

[0047] Embodiment 2:

[0048] The difference from Example 1 is that the bottom of the gas collecting box 5 is provided with an oil drain valve 13 connected to the bottom of the cavity; the top of the gas collecting box cover is provided with a pressure reducing valve connected to the cavity. When the transformer oil in the cavity accumulates a lot, the pressure reducing valve and the oil drain valve 13 are opened successively, and the transformer oil can be discharged more smoothly.

[0049] The working principle of this embodiment is the same as that of Embodiment 1.

[0050] Embodiment 3:

[0051] The difference from Example 1 is that a filter screen 71 is provided at one end of the connecting pipe A7 close to the gas collecting box 5. Since the transformer oil and light gas entering the cavity in a negative pressure state will be pressurized to form an oil-gas mixture, the filter screen 71 is added at the connecting pipe A7 to filter out the transformer oil and prevent the transformer oil from entering the gas storage tank 101 and contacting the detection probe of the high-precision sensor 15 to affect the detection accuracy.

[0052] The working principle of this embodiment is the same as that of Embodiment 1.

[0053] Embodiment 4:

[0054] The difference from the first embodiment is that the gas collecting box 5 is provided with an observation window 51 for observing the amount of transformer oil in the cavity.

[0055] The outer sides of the electric control box 11 and the gas collecting box 5 are provided with a carrying slot 111 .

[0056] A handle 112 is provided in the middle of the top of the electric control box 11 .

[0057] The working principle of this embodiment is the same as that of Embodiment 1.

Claims

1. A transformer gas automatic collection detection box, characterized in that: It comprises a gas collecting box (5), a detection chamber and an electric control box (11); the left side of the electric control box (11) is connected to the right side of the gas collecting box (5), and the top of the electric control box (11) is connected to the bottom of the detection chamber; The gas collecting box (5) is hollow inside, and a cavity for collecting transformer oil and light gas is provided in the hollow part. A pressure sensor (52) is installed on one side of the cavity. An opening is provided at the top of the cavity, and a gas collecting box cover (4) is installed at the opening. An oil and gas delivery pipe (1) communicating with the cavity is provided at the top of the gas collecting box cover (4). An electromagnetic valve A (2) is installed on the oil and gas delivery pipe (1). A manual gas extraction valve (6) communicating with the cavity is provided at the top of the gas collecting box cover (4). The detection chamber comprises a base (10), a cover (9) and a shield (8); the shield (8), the cover (9) and the base (10) are hollow inside and are sealed and connected in sequence from top to bottom; a data processor (14) is installed in the shield (8); a high-precision sensor (15) is installed in the cover (9); an air storage tank (101) is installed in the base (10); a detection probe of the high-precision sensor (15) extends into the air storage tank (101); the air storage tank (101) is connected to the cavity via a connecting pipe A (7); The electric control box (11) is hollow inside, and an integrated processor (16), a power supply (17) and a vacuum pump (18) are installed in the hollow part from top to bottom in sequence. A control panel (12) is provided on the surface of the electric control box (11); the vacuum pump (18) is connected to a tee A (3) installed on the oil and gas delivery pipe (1) through a connecting pipe B, the tee A (3) is placed at the lower end of the solenoid valve A (2), and a solenoid valve B (19) is installed on the connecting pipe B near one end of the vacuum pump (18), a tee B is provided between the solenoid valve B (19) and the vacuum pump (18), and the tee B is connected to the gas storage tank (101) through a connecting pipe C; the connecting pipe C is installed with a solenoid valve C (20); The power supply (17) is electrically connected to the solenoid valve A (2), the control panel (12), the data processor (14), the high-precision sensor (15), the integrated processor (16), the vacuum pump (18), the solenoid valve B (19), the solenoid valve C (20) and the air pressure sensor (52) respectively; the data processor (14) is electrically connected to the high-precision sensor (15) and the air pressure sensor (52) respectively; the integrated processor (16) is electrically connected to the control panel (12), the data processor (14), the solenoid valve A (2), the vacuum pump (18), the solenoid valve B (19) and the solenoid valve C (20) respectively; The bottom of the gas collecting box (5) is provided with an oil drain valve (13) communicating with the bottom of the cavity; the top of the gas collecting box cover is provided with a pressure reducing valve communicating with the cavity; The method for using the transformer gas automatic collection detection box comprises the following steps: S1. Close each solenoid valve before use and connect the oil and gas delivery pipe (1) to the connection port of the transformer; S2, the control panel (12) is operated to start gas detection, the solenoid valve B (19) and the solenoid valve C (20) are opened, and the vacuum pump (18) is started to evacuate the cavity, the gas storage tank (101) and the corresponding pipelines in the gas collecting box (5); the air pressure sensor (52) transmits the pressure data in real time to the data processor (14), and then transmits the pressure data to the integrated processor (16) for analysis and judgment as to whether the cavity has reached a vacuum state, and displays the air pressure data in real time on the control panel; after reaching the vacuum state, the solenoid valve B (19) and the solenoid valve C (20) are closed, and the vacuum pump (18) is turned off and stopped, so that the cavity of the gas collecting box (5) and the gas storage tank (101) in the detection chamber form a vacuum state without gas; S3, the integrated processor (16) controls the opening of the solenoid valve A (2), allowing a small amount of transformer oil and overflowing light gas inside the transformer to enter the gas collecting box (5) through the oil and gas conveying pipe (1); after the air pressure sensor (52) detects that the air pressure in the cavity of the gas collecting box (5) is normal, the high-precision sensor (15) starts to detect the light gas flowing into the gas storage tank (101), the data processor (14) converts the detection result, the integrated processor (16) analyzes the result, and finally displays the first measurement result through the control screen (12); S4, the integrated processor (16) controls the vacuum pump (18) to start, opens the solenoid valve C (20) and closes it after 2 seconds, replaces the light gas in the gas storage tank (101), the high-precision sensor (15) detects again, the data processor (14) converts the detection result, the integrated processor (16) analyzes the result, and displays the second detection result through the control screen (12). The integrated processor (16) combines the average value of the two measurement results to determine whether the transformer is faulty; S5, after the air pressure value in the cavity of the air collecting box (5) is normal, the staff takes out air through the manual air taking valve (6) and tests the corresponding results to further confirm whether the transformer has any fault; S6. The cavity needs to be drained regularly through the drain valve (13).

2. The transformer gas automatic collection detection box according to claim 1 is characterized in that: A filter screen (71) is provided at one end of the connecting pipe A (7) close to the gas collecting box (5).

3. The transformer gas automatic collection detection box according to claim 1 is characterized in that: The gas collecting box (5) is provided with an observation window (51) for observing the amount of transformer oil in the cavity.

4. The transformer gas automatic collection detection box according to claim 1 is characterized in that: The outer sides of the electric control box (11) and the gas collecting box (5) are provided with a carrying groove (111).

5. The transformer gas automatic collection detection box according to claim 1 is characterized in that: A handle (112) is provided in the middle of the top of the electric control box (11).

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