A test equipment for oil-immersed transformer condition monitoring device

Abstract

The invention relates to the technical field of transformer detection devices, and specifically discloses a test device for an oil-immersed transformer state monitoring device, which can be used to test the product quality of the oil-immersed transformer state monitoring device, and can test two oil-immersed transformer state monitoring devices at the same time, thereby improving the test efficiency; a transfer chamber is also provided, and the detection ends of the two oil-immersed transformer state monitoring devices are first inserted into a first oil storage chamber and a second oil storage chamber respectively, and a high-temperature test and a normal-temperature test are respectively performed. After the test is completed, the high-temperature oil in the first oil storage chamber is transferred to the transfer chamber, and the normal-temperature oil in the second oil storage chamber is transferred to the first oil storage chamber, and the high-temperature oil in the transfer chamber can be transferred to the second oil storage chamber, so that the two oil-immersed transformer state monitoring devices are respectively tested at normal temperature and at high temperature. The high and low temperature tests are performed on the same device, and the oil in the first oil storage chamber and the second oil storage chamber are interchanged through the transfer chamber, and the structure is ingenious.

Description

Technical Field

[0001] The invention relates to the technical field of transformer detection devices, and in particular to testing equipment for an oil-immersed transformer state monitoring device. Background Art

[0002] As one of the main power transmission and transformation equipment in the substation, the transformer has a core position in the substation. It can also be said that the transformer is the heart of the substation. The operating status of the transformer directly affects the entire substation. Among them, large power transformers are mostly oil-immersed transformers. The characteristic of oil-immersed transformers is that they use insulating oil as the heat dissipation and insulation medium for the transformer windings and cores.

[0003] When the temperature of the insulating oil in the oil-immersed transformer rises to a certain level, the transformer oil decomposes and volatilizes, which will produce explosive and flammable gases, or local discharge and high temperature. The transformer oil decomposes at high temperature to produce gases such as alkane and hydrogen. When the gas accumulates to a certain level, the pressure inside the transformer will increase. At the same time, if the insulating oil contains a lot of gas, when the oil temperature and pressure drop suddenly or flow rapidly, the gas in the oil may gather in the equipment to form bubbles. When the bubbles are in the insulation layer or on the surface, local discharge is likely to occur, causing local insulation breakdown, thereby affecting the normal operation of the oil-immersed transformer and increasing the risk of transformer accidents. Therefore, temperature monitoring, pressure monitoring, and liquid level monitoring of oil-immersed transformers are particularly important for the safety performance of oil-immersed transformers.

[0004] In the prior art, a state detection device is usually installed on the oil-immersed transformer to monitor the temperature, pressure, liquid level and other parameters of the oil-immersed transformer. Such state detection devices can refer to an oil-immersed transformer state monitoring device disclosed in Chinese Patent Publication No. CN115014440B.

[0005] After the oil-immersed transformer condition monitoring device is produced, it is usually necessary to use a test device to perform quality inspection on it, and then install it on the oil-immersed transformer after passing the inspection. The test equipment in the prior art usually has only one oil storage chamber, and the detection end of the oil-immersed transformer condition monitoring device is inserted into the oil storage chamber. Under sealed conditions, the product quality is judged by comparing the temperature, pressure, liquid level and other numerical deviations detected by the oil-immersed transformer condition monitoring device and the test equipment; using this test equipment, on the one hand, one test device can only test one product at a time, which is inefficient; on the other hand, some oil-immersed transformer condition monitoring devices also need to perform high and low temperature tests. The conventional method is to use two test equipment, one test equipment oil storage chamber is filled with high-temperature oil, and the other test equipment oil storage chamber is filled with normal-temperature oil. The oil-immersed transformer condition monitoring device is installed in the two test equipments in turn for separate inspection, which is cumbersome to operate. Moreover, since the oil-immersed transformer condition monitoring device needs to be immersed in oil during inspection, oil dripping is likely to occur during the transfer of the oil-immersed transformer condition monitoring device, causing oil to contaminate the workbench.

[0006] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a testing device for an oil-immersed transformer condition monitoring device to solve the above-mentioned problems.

[0008] A test device for an oil-immersed transformer condition monitoring device comprises a test seat, wherein a first oil storage cavity, a second oil storage cavity and a transfer cavity are arranged in the test seat;

[0009] The oil in the first oil storage chamber can be transferred to the transfer chamber, the oil in the second oil storage chamber can be transferred to the first oil storage chamber, and the oil in the transfer chamber can be transferred to the second oil storage chamber;

[0010] The upper ends of the first oil storage cavity and the second oil storage cavity are both connected with a plug interface, and the plug interface is used to install a detection end of an oil-immersed transformer state monitoring device;

[0011] The test seat is also fixed with a first liquid level gauge, a second liquid level gauge, a first pressure thermometer and a second pressure thermometer;

[0012] The detection end of the first liquid level gauge and the detection end of the first pressure thermometer both extend into the first oil storage cavity, and the detection end of the second liquid level gauge and the detection end of the second pressure thermometer both extend into the second oil storage cavity.

[0013] Specifically, the first oil storage chamber is located above the transfer chamber, and the second oil storage chamber is located at one side of the transfer chamber;

[0014] The first oil storage chamber and the transfer chamber are connected and disconnected by a first valve;

[0015] The testing device further comprises a liquid pump, through which the oil in the second oil storage chamber is transferred to the first oil storage chamber, and through which the oil in the transfer chamber is transferred to the second oil storage chamber.

[0016] Specifically, the first oil storage chamber is connected to a first liquid inlet;

[0017] The second oil storage chamber is connected to a second liquid inlet and a first liquid outlet;

[0018] The transfer chamber is connected to a second liquid outlet;

[0019] The liquid pump has a first three-way pipe connected to the liquid extraction port, and the other two interfaces of the first three-way pipe are connected to the first liquid outlet and the second liquid outlet respectively;

[0020] The liquid discharge port of the liquid pump is connected to a second three-way pipe, and the other two interfaces of the second three-way pipe are respectively connected to the first liquid inlet and the second liquid inlet;

[0021] The first liquid inlet, the second liquid inlet, the first liquid outlet and the second liquid outlet are all provided with a second valve for controlling on and off.

[0022] Specifically, the transfer chamber is connected to a fluid infusion port.

[0023] Specifically, the testing equipment further includes a heat exchange device, and the heat exchange device is used to exchange heat for the oil in the transfer chamber.

[0024] Specifically, the heat exchange device is a spiral heat exchange tube, and both ends of the spiral heat exchange tube are externally connected to a heat transfer oil furnace.

[0025] Specifically, a flange is fixed on the plug interface by screws, and an internal thread is formed in the flange.

[0026] Specifically, a filter net bag is also provided in the plug-in port, and the detection end of the oil-immersed transformer status monitoring device is inserted into the filter net bag.

[0027] Specifically, the peripheries of the first oil storage chamber, the second oil storage chamber and the transfer chamber are all provided with a thermal insulation structure, and the thermal insulation structure includes an anti-corrosion inner layer, a thermal insulation cotton middle layer, and a high-hardness outer layer which are arranged in sequence from the inside to the outside.

[0028] Beneficial effects of the present invention:

[0029] The testing device of the present invention can be used to test the product quality of the oil-immersed transformer state monitoring device. A first oil storage chamber and a second oil storage chamber are provided in the test seat. The upper ends of the first oil storage chamber and the second oil storage chamber are connected to plug interfaces. The detection ends of the two oil-immersed transformer state monitoring devices can be respectively inserted into the two plug interfaces, so that the two oil-immersed transformer state monitoring devices can be tested at the same time, thereby improving the testing efficiency. A transfer chamber is also provided. If the oil-immersed transformer state monitoring device needs to be tested at a high or low temperature, high-temperature oil can be pre-filled into the first oil storage chamber and normal-temperature oil can be pre-filled into the second oil storage chamber. The detection ends of the two oil-immersed transformer state monitoring devices can be inserted into the two plug interfaces respectively. The ends are respectively inserted into the first oil storage chamber and the second oil storage chamber, and high temperature test and normal temperature test are respectively carried out. After the test is completed, the high temperature oil in the first oil storage chamber is first transferred to the transfer chamber, and then the normal temperature oil in the second oil storage chamber is transferred to the first oil storage chamber, and finally the high temperature oil in the transfer chamber can be transferred to the second oil storage chamber, so that the two oil-immersed transformer condition monitoring devices can be tested at normal temperature and high temperature respectively. The high and low temperature tests are carried out on the same equipment, and the oil in the first oil storage chamber and the second oil storage chamber are interchanged through the transfer chamber. The structure is ingenious, and there is no need to disassemble and reassemble the oil-immersed transformer condition monitoring device during the whole process, so as to avoid oil dripping onto the workbench. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a three-dimensional diagram of the test equipment of this embodiment;

[0031] Figure 2 is an exploded view of the test equipment of this embodiment;

[0032] Figure 3 is a top view of the test device of this embodiment;

[0033] Figure 4 for Figure 3 A three-dimensional cross-sectional view along line AA;

[0034] Figure 5 It is a stereoscopic diagram of the test equipment and two oil-immersed transformer condition monitoring devices of this embodiment.

[0035] The accompanying drawings are marked as follows: test seat 10, first oil storage chamber 11, second oil storage chamber 12, transfer chamber 13, plug interface 14, oil-immersed transformer state monitoring device 20, first liquid level gauge 31, second liquid level gauge 32, first pressure thermometer 33, second pressure thermometer 34, first valve 15, liquid pump 40, first liquid inlet 16, second liquid inlet 17, first liquid outlet 18, second liquid outlet 19, first three-way pipe 41, second three-way pipe 42, liquid replenishing port 110, heat exchange device 50, flange 61, filter net bag 62, thermal insulation structure 70, anti-corrosion inner layer 71, thermal insulation cotton middle layer 72, high hardness outer layer 73. DETAILED DESCRIPTION

[0036] The present invention provides a test device for an oil-immersed transformer condition monitoring device. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] like Figures 1 to 5 , this embodiment discloses a test device for an oil-immersed transformer condition monitoring device, including a test seat 10, in which a first oil storage chamber 11, a second oil storage chamber 12 and a transfer chamber 13 are provided;

[0039] The oil in the first oil storage chamber 11 can be transferred to the transfer chamber 13, the oil in the second oil storage chamber 12 can be transferred to the first oil storage chamber 11, and the oil in the transfer chamber 13 can be transferred to the second oil storage chamber 12;

[0040] The upper ends of the first oil storage chamber 11 and the second oil storage chamber 12 are both connected with a plug-in interface 14, and the plug-in interface 14 is used to install the detection end of the oil-immersed transformer state monitoring device 20;

[0041] The test seat 10 is also fixed with a first liquid level gauge 31, a second liquid level gauge 32, a first pressure thermometer 33 and a second pressure thermometer 34;

[0042] The detection ends of the first liquid level gauge 31 and the first pressure thermometer 33 both extend into the first oil storage chamber 11 , and the detection ends of the second liquid level gauge 32 and the second pressure thermometer 34 both extend into the second oil storage chamber 12 .

[0043] The test equipment of this embodiment can be used to test the product quality of the oil-immersed transformer state monitoring device 20. A first oil storage chamber 11 and a second oil storage chamber 12 are provided in the test seat 10. The upper ends of the first oil storage chamber 11 and the second oil storage chamber 12 are connected to a plug interface 14. The detection ends of the two oil-immersed transformer state monitoring devices 20 can be respectively inserted into the two plug interfaces 14, so that the two oil-immersed transformer state monitoring devices 20 can be tested at the same time, thereby improving the test efficiency.

[0044] The first oil storage chamber 11 is correspondingly provided with a first liquid level gauge 31 and a first pressure thermometer 33, which can feedback the temperature, pressure and liquid level height of the oil in the first oil storage chamber 11, which are respectively recorded as the first temperature, the first pressure and the first liquid level height. When the detection end of the first oil-immersed transformer state monitoring device 20 is inserted into the inner side of the first oil storage chamber 11, the oil-immersed transformer state monitoring device 20 tests the second temperature, the second pressure and the second liquid level height. By comparing the difference between the first temperature and the second temperature, the difference between the first pressure and the second pressure, and the difference between the first liquid level height and the second liquid level height, when these differences do not exceed the set range, it means that the oil-immersed transformer state monitoring device 20 is qualified, otherwise it is unqualified. The second oil storage chamber 12 is correspondingly provided with a second liquid level gauge 32 and a second pressure thermometer 34. The detection principle of the detection end of the second oil-immersed transformer state monitoring device 20 inserted into the inner side of the second oil storage chamber 12 is the same as the detection principle of the first oil-immersed transformer state monitoring device 20, which will not be repeated below.

[0045] It should be noted that the monitoring and numerical display of temperature detection, pressure detection and liquid level height detection by the oil-immersed transformer state monitoring device 20 can refer to an oil-immersed transformer state monitoring device disclosed in Chinese patent publication number CN115014440B, which will not be described in detail below.

[0046] The present embodiment is also provided with a transfer chamber 13. If the oil-immersed transformer condition monitoring device 20 needs to be tested at high and low temperatures, high-temperature oil (over 40°C, simulating outdoor high temperature scenarios) can be pre-filled into the first oil storage chamber 11, and normal-temperature oil (20°C~25°C, simulating outdoor normal temperature scenarios) can be pre-filled into the second oil storage chamber 12. The detection ends of the two oil-immersed transformer condition monitoring devices 20 are first inserted into the first oil storage chamber 11 and the second oil storage chamber 12, respectively, and high-temperature tests and normal-temperature tests are performed respectively. After the tests are completed, the high-temperature oil in the first oil storage chamber 11 is firstly The oil is transferred to the transfer chamber 13, and then the normal temperature oil in the second oil storage chamber 12 is transferred to the first oil storage chamber 11, and finally the high temperature oil in the transfer chamber 13 can be transferred to the second oil storage chamber 12, so that the two oil-immersed transformer condition monitoring devices 20 can perform normal temperature test and high temperature test respectively, and the high and low temperature tests are performed on the same equipment. The transfer chamber 13 is used to realize the interchange of the oil in the first oil storage chamber 11 and the second oil storage chamber 12. The structure is ingenious, and the whole process does not require the oil-immersed transformer condition monitoring device 20 to be disassembled and reassembled, thereby preventing the oil from dripping onto the workbench.

[0047] For further information, please refer to Figure 4The first oil storage chamber 11 is located above the transfer chamber 13, and the second oil storage chamber 12 is located on one side of the transfer chamber 13; the first oil storage chamber 11 and the transfer chamber 13 are controlled by the first valve 15; when the oil in the first oil storage chamber 11 needs to be transferred to the transfer chamber 13, the first valve 15 can be opened, and under the action of gravity, the oil in the first oil storage chamber 11 directly flows into the transfer chamber 13, without the need to additionally set up a liquid pump 40.

[0048] Furthermore, in order to realize the transfer of oil, the testing equipment also includes a liquid pump 40. The oil in the second oil storage chamber 12 is transferred to the first oil storage chamber 11 through the liquid pump 40, and the oil in the transfer chamber 13 is transferred to the second oil storage chamber 12 through the liquid pump 40. The transfer is performed by the liquid pump 40, and the transfer efficiency is high.

[0049] For further information, please refer to Figure 2 and Figure 4 The first oil storage chamber 11 is connected to the first liquid inlet 16; the second oil storage chamber 12 is connected to the second liquid inlet 17 and the first liquid outlet 18; the transfer chamber 13 is connected to the second liquid outlet 19; the liquid pump 40 is connected to the first three-way pipe 41, and the other two interfaces of the first three-way pipe 41 are respectively connected to the first liquid outlet 18 and the second liquid outlet 19; the liquid discharge port of the liquid pump 40 is connected to the second three-way pipe 42, and the other two interfaces of the second three-way pipe 42 are respectively connected to the first liquid inlet 16 and the second liquid inlet 17; the first liquid inlet 16, the second liquid inlet 17, the first liquid outlet 18, and the second liquid outlet 19 are all provided with a second valve for controlling the on-off; when the oil in the transfer chamber 13 needs to be transferred to the second oil storage chamber 12, The second valve corresponding to the first liquid inlet 16 and the first liquid outlet 18 can be closed first, and the second valve corresponding to the second liquid outlet 19 and the second liquid inlet 17 can be opened. After the liquid pump 40 is started, the oil in the transfer chamber 13 can only be transferred to the second oil storage chamber 12; when the oil in the second oil storage chamber 12 needs to be transferred to the first oil storage chamber 11, the second valve corresponding to the second liquid outlet 19 and the second liquid inlet 17 can be closed first, and the second valve corresponding to the first liquid inlet 16 and the first liquid outlet 18 can be opened. After the liquid pump 40 is started, the oil in the second oil storage chamber 12 can only be transferred to the first oil storage chamber 11; through such a setting, one liquid pump 40 can be used to control multiple oil delivery methods, the structure is ingenious, and the cost is reduced.

[0050] The oil-immersed transformer condition monitoring device 20 may take away a small amount of oil after detection, and part of the oil may also evaporate, causing the oil level in the first oil storage chamber 11 or the second oil storage chamber 12 to decrease. In order to avoid affecting the detection result due to the decrease in the oil level, the transfer chamber 13 in this embodiment is connected with a liquid replenishing port 110. The transfer chamber 13 is also used to replenish the oil. The transfer chamber 13 may also be provided with a third liquid level gauge for detecting the liquid level. After the oil in the first oil storage chamber 11 is transferred to the transfer chamber 13, the third liquid level gauge detects the liquid level height of the first oil storage chamber 11. When the liquid level height of the transfer chamber 13 is lower than the set value, the liquid can be replenished through the liquid replenishing port 110.

[0051] For further information, please refer to Figure 2 and Figure 4 After a long period of detection, the temperature of the high-temperature oil may decrease. In order to ensure the smooth progress of the high-temperature detection, the test equipment also includes a heat exchange device 50, which is used to exchange heat for the oil in the transfer chamber 13; the transfer chamber 13 is also used to heat the high-temperature oil. The transfer chamber 13 can also be correspondingly provided with a third thermometer for detecting the temperature. After the oil in the first oil storage chamber 11 is transferred to the transfer chamber 13, the third thermometer detects the temperature of the first oil storage chamber 11. When the oil temperature in the transfer chamber 13 is lower than the set value, the heat exchange device 50 can be used to heat up.

[0052] Furthermore, the heat exchange device 50 of this embodiment is a spiral heat exchange tube, and both ends of the spiral heat exchange tube are externally connected to a heat transfer oil furnace; the use of the spiral heat exchange tube has a higher heat exchange efficiency.

[0053] Please refer to Figure 1 , Figure 2 and Figure 5 The lower end of the oil-immersed transformer state monitoring device 20 has an external thread. In order to facilitate the installation of the oil-immersed transformer state monitoring device 20, a flange 61 is fixed to the plug-in port 14 of this embodiment by screws, and an internal thread is formed in the flange 61. The oil-immersed transformer state monitoring device 20 is installed by threaded connection, which has low difficulty in disassembly and assembly, and better sealing after installation.

[0054] The oil-immersed transformer condition monitoring device 20 is prone to bring in some metal debris during the test process. To avoid metal debris from mixing into the oil, please refer to Figure 2 and Figure 4 A filter net bag 62 is also provided in the plug-in port 14. The detection end of the oil-immersed transformer condition monitoring device 20 is inserted into the filter net bag 62. Metal debris is collected through the filter net bag 62. The filter net bag 62 can also be removed and cleaned regularly.

[0055] For further information, please refer to Figure 4The first oil storage chamber 11, the second oil storage chamber 12 and the transfer chamber 13 are all provided with a thermal insulation structure 70. The thermal insulation structure 70 includes an anti-corrosion inner layer 71, a thermal insulation cotton middle layer 72, and a high-hardness outer layer 73 which are arranged from the inside to the outside. By setting the thermal insulation structure 70, the thermal insulation performance is improved and the temperature loss between the cavities is avoided.

[0056] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A test device for an oil-immersed transformer condition monitoring device, characterized in that: The test seat (10) comprises a test seat (10) and a liquid pump (40), wherein a first oil storage chamber (11), a second oil storage chamber (12) and a transfer chamber (13) are provided in the test seat (10), wherein the first oil storage chamber (11) is located above the transfer chamber (13), and the second oil storage chamber (12) is located on one side of the transfer chamber (13); The oil in the first oil storage chamber (11) can be transferred to the transfer chamber (13), and the first oil storage chamber (11) and the transfer chamber (13) are controlled to be on and off by a first valve (15); the oil in the second oil storage chamber (12) can be transferred to the first oil storage chamber (11) by the liquid pump (40), and the oil in the transfer chamber (13) can be transferred to the second oil storage chamber (12) by the liquid pump (40), and the high and low temperature oil in the first oil storage chamber (11) and the second oil storage chamber (12) can be exchanged through the transfer chamber (13); The upper ends of the first oil storage chamber (11) and the second oil storage chamber (12) are both connected to a plug interface (14), and the plug interface (14) is used to install a detection end of an oil-immersed transformer state monitoring device (20); The test seat (10) is also fixed with a first liquid level gauge (31), a second liquid level gauge (32), a first pressure thermometer (33) and a second pressure thermometer (34); The detection end of the first liquid level gauge (31) and the detection end of the first pressure thermometer (33) both extend into the first oil storage chamber (11), and the detection end of the second liquid level gauge (32) and the detection end of the second pressure thermometer (34) both extend into the second oil storage chamber (12).

2. The testing equipment of the oil-immersed transformer condition monitoring device according to claim 1 is characterized in that: The first oil storage chamber (11) is connected to a first liquid inlet (16); The second oil storage chamber (12) is connected to a second liquid inlet (17) and a first liquid outlet (18); The transfer chamber (13) is connected to a second liquid outlet (19); The liquid extraction port of the liquid pump (40) is connected to a first three-way pipe (41), and the other two interfaces of the first three-way pipe (41) are respectively connected to the first liquid outlet (18) and the second liquid outlet (19); The liquid discharge port of the liquid pump (40) is connected to a second three-way pipe (42), and the other two interfaces of the second three-way pipe (42) are respectively connected to the first liquid inlet (16) and the second liquid inlet (17); The first liquid inlet (16), the second liquid inlet (17), the first liquid outlet (18), and the second liquid outlet (19) are all provided with a second valve for controlling on and off.

3. The testing equipment of the oil-immersed transformer condition monitoring device according to claim 1 is characterized in that: The transfer chamber (13) is connected to a fluid infusion port (110).

4. The testing equipment of the oil-immersed transformer condition monitoring device according to claim 1 is characterized in that: The testing device further comprises a heat exchange device (50), wherein the heat exchange device (50) is used to exchange heat for the oil in the transfer chamber (13).

5. The testing equipment of the oil-immersed transformer condition monitoring device according to claim 4 is characterized in that: The heat exchange device (50) is a spiral heat exchange tube, and both ends of the spiral heat exchange tube are externally connected to a heat transfer oil furnace.

6. The testing equipment of the oil-immersed transformer condition monitoring device according to claim 1, characterized in that: A flange (61) is fixed to the plug port (14) by means of screws, and an internal thread is formed in the flange (61).

7. The testing equipment of the oil-immersed transformer condition monitoring device according to claim 1, characterized in that: A filter net bag (62) is also provided in the plug-in port (14), and a detection end of the oil-immersed transformer state monitoring device (20) is inserted into the filter net bag (62).

8. The testing equipment of the oil-immersed transformer condition monitoring device according to claim 1, characterized in that: The first oil storage chamber (11), the second oil storage chamber (12) and the transfer chamber (13) are all provided with a heat-insulating structure (70) on their peripheries, the heat-insulating structure (70) comprising an anti-corrosion inner layer (71), a heat-insulating cotton middle layer (72) and a high-hardness outer layer (73) which are arranged in sequence from the inside to the outside.

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