Oil level testing device for power grid main transformer

Abstract

The invention discloses an oil level testing device for a power grid main transformer. The oil level testing device comprises a connecting pipe; the three-way valve is provided with a first valve connector, a second valve connector and a third valve connector, and one end of the connecting pipe is fastened to the first valve connector; the guide pipe is fastened on the second valve interface; the transparent hose assembly is detachably connected to the guide pipe and comprises a transparent hose body, a floater and a pipe sleeve; the connecting pipe is communicated with an oil taking opening of the power grid main transformer, the transparent hose body is supported and lifted through the liftable support and the pipe sleeve, and the oil level in the main transformer expansion tank is indicated through the position of the floater in the transparent hose body. By implementing the oil level testing device for the main transformer of the power grid, the real oil level of the main transformer can be accurately and intuitively tested under the condition that power is not cut off; the structure is simple, safe, reliable and convenient to repair and maintain.

Description

Technical Field

[0001] This invention relates to the field of power substation equipment maintenance technology, and in particular to an oil level testing device for main transformers in power grids. Background Technology

[0002] In existing technology, the main transformer is the core equipment of the power system, and its oil level directly affects the equipment's insulation capacity and heat dissipation effect. Too low an oil level will reduce the transformer's heat dissipation capacity, affect the main insulation capacity, and may cause serious power grid accidents; too high an oil level may lead to transformer oil spraying accidents.

[0003] Currently, transformer oil level detection mainly has the following problems: traditional mechanical oil level gauges are prone to "false oil level" phenomena. The root cause of these oil level problems is that they rely too much on the mechanical transmission principle. When the mechanism is stuck or there is oil leakage, the reading will be inaccurate. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an oil level testing device for a main transformer of a power grid, which can accurately and intuitively test the actual oil level of the main transformer without power interruption; the device has a simple structure, is safe and reliable, and is easy to repair and maintain.

[0005] To address the aforementioned technical problems, this invention provides an oil level testing device for a main transformer in a power grid, comprising: a connecting pipe for connecting to the oil injection / drainage valve of the transformer; a three-way valve having a first valve interface, a second valve interface, and a third valve interface, with one end of the connecting pipe fastened to the first valve interface; a guide pipe fastened to the second valve interface; a detachable transparent flexible hose assembly connected to the guide pipe, the transparent flexible hose assembly comprising: a transparent flexible hose body, a float installed in the transparent flexible hose body, and a sleeve connected to one end of the transparent flexible hose body; and a liftable support, with the sleeve connected to the liftable support, wherein: the connecting pipe connects to the oil inlet of the main transformer in the power grid, and the liftable support and sleeve support and lift the transparent flexible hose body; the float floats within the transparent flexible hose body with the oil level, and the position of the float within the transparent flexible hose body indicates the oil level in the main transformer's oil conservator.

[0006] The first and second valve interfaces are assembled vertically, while the third valve interface is assembled horizontally.

[0007] This also includes: an oil drain pipe fastened to the third valve interface, with an oil drain port at one end.

[0008] The connecting pipe is welded and fastened to the first valve interface, the guide pipe to the second valve interface, and the drain pipe to the third valve interface.

[0009] The transparent hose body is made of an oil-resistant transparent material.

[0010] One end of the sleeve is equipped with a hanging ring for supporting and lifting the transparent hose assembly; one end of the sleeve is connected to the atmosphere to maintain the pressure balance inside the transparent hose body.

[0011] The height of the adjustable support frame is adjusted by using multiple sections of telescopic rods.

[0012] The guide tube is detachably connected to the transparent hose body via a matching flange and clamp structure.

[0013] The oil level testing device for a main transformer of a power grid according to the present invention has the following beneficial effects: The oil level testing device for a main transformer of a power grid includes: a connecting pipe for connecting to the oil injection / drainage valve of the transformer; a three-way valve having a first valve interface, a second valve interface, and a third valve interface, with one end of the connecting pipe fastened to the first valve interface; a guide pipe fastened to the second valve interface; a detachable transparent flexible hose assembly connected to the guide pipe, the transparent flexible hose assembly including: a transparent flexible hose body, a float installed in the transparent flexible hose body, and a sleeve connected to one end of the transparent flexible hose body; and a liftable support, with the sleeve connected to the liftable support, wherein: the connecting pipe connects to the oil inlet of the main transformer of the power grid, and the liftable support and sleeve support and lift the transparent flexible hose body; the float floats in the transparent flexible hose body with the oil level, and the position of the float in the transparent flexible hose body indicates the oil level in the oil tank of the main transformer, enabling accurate and intuitive testing of the true oil level of the main transformer without power interruption; the structure is simple, safe and reliable, and easy to repair and maintain. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a structural block diagram of an oil level testing device for a main transformer in a power grid, according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of an oil level testing device for a main transformer in a power grid, according to an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the structure of a three-way valve used in an oil level testing device for a main transformer in a power grid, according to an embodiment of the present invention.

[0018] Figure 4This is a schematic diagram illustrating the effect of the float position in the oil level testing device for a power grid main transformer according to an embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1-4 The image shows an embodiment of the oil level testing device for a power grid main transformer according to the present invention.

[0021] The oil level testing device for a main transformer of a power grid in this embodiment of the invention includes: a connecting pipe 1 for connecting to the oil injection / drainage valve 3 of the transformer; a three-way valve 2, which has a first valve interface 21, a second valve interface 22 and a third valve interface 23, with one end of the connecting pipe 1 fastened to the first valve interface 21; a guide pipe 4 fastened to the second valve interface 22; a detachable transparent hose assembly 5 connected to the guide pipe 4, the transparent hose assembly 5 including: a transparent hose body 51, a float 52 installed in the transparent hose body 51 and a sleeve 53 connected to one end of the transparent hose body 51; and a liftable support 6, with the sleeve 53 connected to the liftable support 6.

[0022] The oil inlet / outlet valve 3 of the main transformer is connected to the oil inlet of the main transformer via the connecting pipe 1. The transparent hose body 51 is supported and lifted by the liftable bracket 6 and the sleeve 53. The float 52 floats in the transparent hose body 51 with the oil level. The position of the float 52 in the transparent hose body 51 indicates the oil level in the main transformer oil tank.

[0023] In practical implementation, the three-way valve 2 is used to connect the oil inlet / outlet valve 3 of the main transformer of the power grid. The first valve interface 21 and the second valve interface 22 are respectively connected to the opposite ends of the vertical pipe and are vertically assembled. The third valve interface 23 is connected to one end of the horizontal pipe and is horizontally assembled. The horizontal pipe is vertically connected to the middle of the vertical pipe, and the horizontal pipe and the vertical pipe are connected.

[0024] Preferably, it also includes: an oil drain pipe 7 fastened to the third valve interface 23, with an oil drain port at one end of the oil drain pipe 7.

[0025] In this embodiment, the connecting pipe 1 is welded and fastened to the first valve interface 21, the guide pipe 4 is welded and fastened to the second valve interface 22, and the drain pipe 7 is welded and fastened to the third valve interface 23. Specifically, by rationally setting the assembly relationship between the connecting pipe 1, the three-way valve 2, the guide pipe 4, and the drain pipe 7, the oil extraction function is achieved through the corresponding interfaces.

[0026] Preferably, the guide tube 4 is detachably connected to the transparent hose body 51 via a matching flange and clamp structure.

[0027] Furthermore, the transparent hose body 51 is made of an oil-resistant transparent material, such as transparent polyurethane or a similar material, which has good oil resistance and transparency. The inner diameter of the transparent hose body 51 is slightly larger than the outer diameter of the float 52, and the length of the transparent hose body 51 can be estimated based on the height of the transformer.

[0028] One end of the transparent hose body 51 can be detachably connected to the guide tube 4, and the other end of the transparent hose body 51 can be detachably assembled and connected to the sleeve 53.

[0029] Furthermore, the sleeve 53 is connected to the end of the transparent hose body 51. In this embodiment, the sleeve 53 is provided with a hanging ring, which serves to raise and fix the end of the transparent hose body 51. In this embodiment, the sleeve 53 is connected to the atmosphere, thus maintaining the internal pressure balance of the transparent hose body 51.

[0030] Furthermore, the float 52 is installed in the transparent hose body 51. The float 52 can move freely up and down with the oil level. In this embodiment, the float 52 is a bright red color, but it can also be other high-contrast colors, as long as it can clearly indicate the oil level.

[0031] In practice, the function of visual liquid level is achieved by reasonably setting the assembly relationship between the transparent hose body 51, float 52 and sleeve 53. Preferably, the transparent hose body 51 has a scale on the outside, or its height can be measured by an auxiliary tool, which corresponds to the actual oil level in the transformer oil conservator.

[0032] Furthermore, the function of the liftable support 6 is to support and raise the sleeve 53. The height of the liftable support 6 is designed to be flexibly adjustable, specifically through the adaptation of structures such as telescopic rods, pulleys, and counterweights. During operation, In the specific implementation of the oil level testing device for the main transformer of the power grid in this embodiment of the invention, when it is necessary to monitor the oil level, the oil filling and draining valve 3 of the transformer is opened, and the oil in the transformer oil tank will enter the transparent hose assembly 5 through the connecting pipe 1, the three-way valve 2, and the guide pipe 4. As the oil level in the transparent hose body 51 rises, it will push the red float 52 to float upward.

[0033] Because the sleeve 53 at the end of the transparent hose body 51 is open to the atmosphere, and the height of the sleeve 53 can be adjusted by the liftable bracket 6. According to the principle of communicating vessels, when the oil in the transparent hose body 51 is stable, its liquid level is equal to the actual oil level in the transformer oil conservator. The operator can directly observe the position indicated by the red float 52 to obtain the oil level information, directly raise the oil level in the transformer oil conservator to a height that is easy to observe and display, or measure its height with auxiliary tools, which corresponds to the actual oil level in the transformer oil conservator.

[0034] During operation, the initial height of the transparent hose end can be adjusted using the adjustable bracket 6 to facilitate smooth oil flow into the hose and ensure stable display. After measurement, close the oil filling / draining valve 3, and drain the residual oil from the pipeline through the valve on the drain pipe 7. Disassemble and clean the pipeline for future use.

[0035] It is understood that the oil level testing device for main transformers in the embodiments of the present invention can be applied to online monitoring and daily inspection of the actual oil level of oil-filled equipment such as main transformers and reactors in substations at all levels, such as ultra-high voltage and extra-high voltage substations. It can also be used to assist in judging whether traditional oil level gauges are accurate, and as a convenient tool for checking the oil level before and after transformer maintenance, which facilitates maintenance and testing.

[0036] The oil level testing device for a main transformer of a power grid according to the present invention has the following beneficial effects: The oil level testing device for a main transformer of a power grid includes: a connecting pipe for connecting to the oil injection / drainage valve of the transformer; a three-way valve having a first valve interface, a second valve interface, and a third valve interface, with one end of the connecting pipe fastened to the first valve interface; a guide pipe fastened to the second valve interface; a detachable transparent flexible hose assembly connected to the guide pipe, the transparent flexible hose assembly including: a transparent flexible hose body, a float installed in the transparent flexible hose body, and a sleeve connected to one end of the transparent flexible hose body; and a liftable support, with the sleeve connected to the liftable support, wherein: the connecting pipe connects to the oil inlet of the main transformer of the power grid, and the liftable support and sleeve support and lift the transparent flexible hose body; the float floats in the transparent flexible hose body with the oil level, and the position of the float in the transparent flexible hose body indicates the oil level in the oil tank of the main transformer, enabling accurate and intuitive testing of the true oil level of the main transformer without power interruption; the structure is simple, safe and reliable, and easy to repair and maintain.

Claims

1. An oil level testing device for a main transformer in a power grid, characterized in that, include: Connecting pipe used to connect the oil filling and draining valves of the transformer; A three-way valve, wherein the three-way valve has a first valve port, a second valve port and a third valve port, and one end of the connecting pipe is fastened to the first valve port; A guide tube fastened to the second valve interface; A detachable transparent flexible tube assembly connected to the guide tube, the transparent flexible tube assembly comprising: a transparent flexible tube body, a float disposed within the transparent flexible tube body, and a sleeve connected to one end of the transparent flexible tube body; and A liftable support is provided, and the sleeve is connected to the liftable support. The sleeve is connected to the oil inlet of the main transformer of the power grid through the connecting pipe. The liftable support and the sleeve support the transparent hose body for support and lifting. The float floats in the transparent hose body with the oil level. The position of the float in the transparent hose body indicates the oil level in the main transformer oil tank.

2. The oil level testing device for a power grid main transformer as described in claim 1, characterized in that, The first valve interface and the second valve interface are assembled vertically, while the third valve interface is assembled horizontally.

3. The oil level testing device for a power grid main transformer as described in claim 2, characterized in that, Also includes: An oil drain pipe is fastened to the third valve interface, and one end of the oil drain pipe is provided with an oil drain port.

4. The oil level testing device for a power grid main transformer as described in claim 3, characterized in that, The connecting pipe is welded and fastened to the first valve interface, the guide pipe to the second valve interface, and the drain pipe to the third valve interface, respectively.

5. The oil level testing device for a power grid main transformer as described in claim 1, characterized in that, The transparent hose body is made of an oil-resistant transparent material.

6. The oil level testing device for a main transformer in a power grid as described in claim 1, characterized in that, One end of the sleeve is provided with a hanging ring for supporting and lifting the transparent hose assembly; one end of the sleeve is connected to the atmosphere to maintain the pressure balance inside the transparent hose body.

7. The oil level testing device for a power grid main transformer as described in claim 1, characterized in that, The height of the adjustable support is adjusted by means of multiple telescopic rods.

8. The oil level testing device for a power grid main transformer as described in claim 1, characterized in that, The guide tube is detachably connected to the transparent flexible tube body via a matching flange and clamp structure.

Images