High-altitude converter transformer oil injection backflow prevention device

Abstract

The utility model discloses a high altitude converter transformer oil injection backflow prevention device which comprises an oil filter, an oil outlet of the oil filter is connected with an oil injection pipe extending to a transformer, the oil injection pipe is provided with a one-way conduction structure, and the one-way conduction structure achieves communication from the oil filter to the transformer and stopping from the transformer to the oil filter. The one-way conduction structure comprises a Tesla valve installed on the oil injection pipe. According to the utility model, the anti-backflow mechanical structure for oil injection of the converter transformer is simplified, the reliability is improved, and no backflow of insulating oil under the conditions of power failure and mechanical failure is ensured.

Description

Technical Field

[0001] This utility model relates to the field of converter station installation technology in the power industry, specifically to a high-altitude converter transformer oil injection anti-backflow device. Background Technology

[0002] In the converter station installation section of the power industry, the converter transformer oil injection process is a key step in the installation or maintenance of converter transformer bushings. It requires injecting qualified insulating oil into the converter transformer through an oil filter, and during the oil injection process, it is necessary to ensure that the converter transformer oil does not flow backwards regardless of power outage or other environmental conditions (because the transformer oil level is high, there is a risk of backflow when there is a power outage or mechanical failure).

[0003] With the widespread application of ultra-high voltage direct current (UHVDC) transmission, converter transformers, as core equipment, need to withstand higher voltages and currents. The quality of oil filling directly affects the insulation performance and operational reliability of the bushings and windings. Substandard oil filling processes may lead to serious accidents such as partial discharge and insulation breakdown, threatening power grid safety.

[0004] The current method for preventing oil backflow involves setting up a backup oil pump in conjunction with backup oil lines and valves. If oil backflow occurs, the backup oil pump is immediately activated to pump the oil back to the oil storage device, preventing contamination of the vacuum system or the equipment's interior. However, this backflow prevention method is structurally complex, and the equipment has a high mechanical failure rate in high-altitude areas. Power outages or mechanical failures can cause the backflow emergency measures to fail. Utility Model Content

[0005] In order to solve the problems in the prior art, this utility model provides a high-altitude converter oil injection anti-backflow device.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A high-altitude converter transformer oil injection anti-backflow device includes an oil filter, the oil outlet of which is connected to an oil injection pipe extending to the transformer. The oil injection pipe is provided with a one-way conduction structure, which enables communication from the oil filter to the transformer and cuts off communication from the transformer to the oil filter. The one-way conduction structure includes a Tesla valve installed on the oil injection pipe.

[0008] Furthermore, the oil filter is provided in two sets, and each set of oil filters is connected to an oil injection pipe. Both sets of oil injection pipes are provided with the aforementioned one-way conduction structure.

[0009] The outlets of both sets of oil injection pipes are connected to the inlet end of the same oil inlet pipe, and the outlet end of the oil inlet pipe is connected to the transformer.

[0010] Furthermore, the unidirectional conduction structure also includes a control valve located upstream and / or downstream of the Tesla valve.

[0011] Furthermore, the control valve is a check valve.

[0012] Furthermore, a flow monitoring device is installed on the oil injection pipe.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model simplifies the mechanical structure of the converter transformer oil injection anti-backflow mechanism, increases reliability, and ensures that the insulating oil does not flow back even in the event of power outage or mechanical failure.

[0015] 2. This utility model uses a Tesla valve to achieve passive backflow prevention, which can still achieve the backflow prevention effect under power failure or mechanical failure.

[0016] 3. This utility model also provides a control valve at the upstream and / or downstream position of the Tesla valve, which, through dual measures, ensures that the insulating oil will never flow back.

[0017] 4. This utility model is equipped with two sets of oil filters and oil injection pipes. Each set of oil injection pipes is equipped with anti-backflow measures. In this way, the two sets of oil injection pipes can dynamically adjust and supplement each other to ensure balanced oil injection pressure on the transformer. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0019] Figure 2 This is the front view of the present invention;

[0020] Figure 3 This is a top view of the present invention.

[0021] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] like Figures 1 to 3 As shown, this embodiment provides a high-altitude converter transformer oil injection anti-backflow device, including two sets of oil filters 1. The oil outlets of the two sets of oil filters 1 are respectively connected to oil injection pipes 2. Both sets of oil injection pipes 2 are provided with a unidirectional conduction structure. The unidirectional conduction structure realizes the connection from the oil filter 1 to the transformer 3 and the cut-off from the transformer 3 to the oil filter 1.

[0024] In this embodiment, the one-way conduction structure includes a Tesla valve 4 installed on the oil injection pipe 2, and a check valve 5 disposed downstream of the Tesla valve 4.

[0025] Tesla valve 4 is a passive check valve. It has no opening or closing parts and achieves backflow prevention only through the design of the flow channel. Therefore, it has a low failure rate and is the most important measure to prevent backflow when the converter is injecting oil.

[0026] Check valve 5 is a conventional design; its opening and closing mechanism relies on the force of the medium flow to automatically open or close. This type of valve has a high failure rate and is therefore only used as an auxiliary measure in the oil injection and backflow prevention of the converter.

[0027] In this way, the combination of the above two anti-backflow measures ensures that the insulating oil will never flow back.

[0028] The oil injection pipe 2 is also equipped with a flow monitoring instrument 6 for flow monitoring.

[0029] The working principle of this utility model is as follows:

[0030] During operation, the oil filter 1 is turned on to filter the transformer oil, and the flow monitor 6 monitors the flow rate. The transformer oil enters the transformer through the Tesla valve 4 and the check valve 5. When there is a power outage or mechanical failure, the transformer oil level is high, which may cause backflow. The oil is blocked by the check valve 5 and the Tesla valve 4 to prevent backflow. The flow monitor 6 performs data analysis and status monitoring, uploads the data to the server, records it, and issues an alarm.

[0031] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

[0032] If the terms "first" or "second" are used in this document to define the components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing this utility model and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A high-altitude converter transformer oil injection anti-backflow device, characterized in that, It includes an oil filter, the oil outlet of which is connected to an oil injection pipe extending to the transformer. The oil injection pipe is equipped with a one-way flow structure, which enables connection from the oil filter to the transformer and cuts off from the transformer to the oil filter. The one-way flow structure includes a Tesla valve installed on the oil injection pipe.

2. The high-altitude converter transformer oil injection anti-backflow device according to claim 1, characterized in that, The oil filter is provided in two sets, and each set of oil filters is connected to an oil injection pipe. Both sets of oil injection pipes are equipped with the unidirectional conduction structure. The outlets of both sets of oil injection pipes are connected to the inlet end of the same oil inlet pipe, and the outlet end of the oil inlet pipe is connected to the transformer.

3. The high-altitude converter transformer oil injection anti-backflow device according to claim 1 or 2, characterized in that, The unidirectional conduction structure also includes a control valve located upstream and / or downstream of the Tesla valve.

4. The high-altitude converter transformer oil injection anti-backflow device according to claim 3, characterized in that, The control valve is a check valve.

5. The high-altitude converter transformer oil injection anti-backflow device according to claim 1 or 2, characterized in that, The oil injection pipe is equipped with a flow monitoring device.

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