An external liquid cooling temperature control device suitable for corrugated fuel tank distribution transformer

Abstract

The application discloses a kind of external hanging type liquid cooling temperature control device suitable for corrugated oil tank distribution transformer, including liquid cooling jacket, circulating liquid supply system and control system, liquid cooling jacket is nested in the outside of corrugated sheet of corrugated oil tank and is attached with its surface;Circulating liquid supply system is connected with the liquid inlet and liquid outlet of liquid cooling jacket respectively and communicates;Control system is electrically connected with circulating liquid supply system.The application is nested on the surface of corrugated sheet by liquid cooling jacket without damage, cooperates closed circulating liquid supply system with intelligent graded temperature control, realizes the lossless efficient cooling of corrugated oil tank distribution transformer, significantly prolongs equipment life and reduces energy consumption.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation technology for corrugated tank transformers, specifically to an external liquid-cooled temperature control device adapted to corrugated tank distribution transformers. Background Technology

[0002] Oil-immersed distribution transformers are core equipment in power distribution networks, and their operational reliability directly affects the safety and stability of power supply. During transformer operation, copper and iron losses generated by the core and windings are converted into heat, which is transferred to the tank walls and corrugated sheets via convective heat transfer in the transformer oil, and ultimately dissipated into the surrounding environment. When a transformer operates under high temperature and overload conditions for extended periods, the transformer oil undergoes accelerated oxidation and deterioration, and the insulating paperboard ages and degrades, leading to a decrease in insulation strength and a significant shortening of equipment lifespan. In severe cases, this can cause major accidents such as insulation breakdown and short-circuit burnout. Therefore, efficient and reliable heat dissipation technology is crucial for ensuring the safe operation of transformers and extending their lifespan.

[0003] Currently, corrugated tank distribution transformers mainly rely on natural heat dissipation through corrugated sheets. These sheets are made of thin steel plates and also serve to compensate for the expansion and contraction of transformer oil volume due to temperature changes. This structure can meet the heat dissipation requirements under normal light load conditions. However, under conditions such as high temperature environments, long-term overload, or frequent fluctuating loads, the top oil temperature is prone to exceeding the limits specified in GB / T1094.2 "Power Transformers Part 2: Temperature Rise of Liquid-Immersed Transformers", accelerating insulation aging and shortening the service life of the equipment.

[0004] Therefore, providing an external liquid-cooled temperature control device adapted to corrugated tank distribution transformers is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an external liquid-cooled temperature control device adapted to corrugated tank distribution transformers, so as to realize non-destructive external liquid-cooled intelligent temperature control of distribution transformers, which has the comprehensive effects of efficient cooling, non-destructive installation, energy-saving operation and safety early warning.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An external liquid-cooled temperature control device adapted to a corrugated tank distribution transformer includes a liquid-cooled jacket, a circulating liquid supply system, and a control system. The liquid-cooled jacket is nested outside the corrugated sheets of the corrugated tank and is in contact with its surface. The circulating liquid supply system is connected to the liquid inlet and outlet of the liquid-cooled jacket respectively. The control system is electrically connected to the circulating liquid supply system.

[0008] Furthermore, the liquid cooling jacket is formed by spiraling a flat pipe, creating a spiral liquid cooling flow channel inside; the pipe wall of the flat pipe is in contact with the surface of the corrugated sheet; the upper end of the flat pipe is the liquid inlet, and the lower end of the flat pipe is the liquid outlet.

[0009] Furthermore, the circulating liquid supply system includes a liquid storage tank, a variable frequency circulating pump, and a condenser connected in sequence via pipelines. The liquid storage tank is connected to the liquid outlet via a liquid outlet pipeline, and the condenser is connected to the liquid inlet via a liquid inlet pipeline.

[0010] Furthermore, the control system includes a temperature sensor and a controller, the temperature sensor being mounted on the top of the corrugated oil tank; the temperature sensor is electrically connected to the controller, and the controller is electrically connected to the variable frequency circulating pump.

[0011] Furthermore, the control system also includes an audible and visual alarm, and the controller is electrically connected to the audible and visual alarm.

[0012] Therefore, the present invention provides an external liquid-cooled temperature control device adapted to corrugated tank distribution transformers. Compared with the prior art, the present invention has the following beneficial effects: 1) Non-destructive installation, protecting the original structure and performance of the transformer. The liquid cooling jacket of the present invention is nested outside the corrugated sheet and fits against its surface, eliminating the need for any welding, drilling or opening operations on the oil tank wall plate, thus fully preserving the free expansion and contraction function and volume compensation performance of the corrugated sheet, and fundamentally eliminating the risk of oil leakage.

[0013] 2) Contour-fit design significantly improves heat exchange efficiency. This invention employs a liquid-cooled jacket formed by spiraling flat pipes. The wide plane of the flat pipes forms a large-area surface contact with the plate-like surface of the corrugated sheets, which greatly increases the contact area and significantly reduces the contact thermal resistance. At the same time, the coolant flows along the spiral flow channel, which extends the heat exchange path and heat exchange time within a limited space, allowing for full exchange of hot and cold fluids and significantly improving heat exchange efficiency.

[0014] 3) Intelligent graded temperature control, resulting in significant energy savings and reduced consumption. The control system of this invention collects temperature signals in real time through temperature sensors installed inside the transformer oil tank and on the corrugated sheet. The controller adjusts the speed of the variable frequency circulating pump in stages according to the preset temperature threshold, and supplies liquid as needed, avoiding the waste of electricity and equipment damage caused by long-term full-load operation or frequent start-stop of fans and water pumps, and achieving efficient energy-saving heat dissipation.

[0015] 4) Standardized adaptation, multi-scenario coverage This invention can configure a corresponding number of liquid-cooled jackets according to the transformer capacity, covering the entire series of 10kV corrugated distribution transformers from 30 to 2500kVA; it is suitable for various installation environments such as indoor, outdoor, and box-type substations, has a high degree of standardization, and has good prospects for large-scale promotion and application. Attached Figure Description

[0016] 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 The attached figure is a structural schematic diagram of an existing corrugated tank distribution transformer provided by the present invention; Figure 2 The attached figure is a structural schematic diagram of an external liquid-cooled temperature control device adapted to a corrugated oil tank distribution transformer provided by the present invention. Figure 3 The attached figure is a three-dimensional structural schematic diagram of the liquid cooling jacket provided by the present invention; Figure 4 The attached figure is a side view of the liquid cooling jacket provided by the present invention. Detailed Implementation

[0018] 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.

[0019] like Figure 1-4 As shown in the figure, this invention discloses an external liquid-cooled temperature control device adapted to a corrugated tank distribution transformer, including a liquid-cooled jacket 1, a circulating liquid supply system, and a control system. The liquid-cooled jacket 1 is nested outside the corrugated sheet 21 of the corrugated tank 2 and is in contact with its surface. The circulating liquid supply system is connected to the inlet and outlet of the liquid-cooled jacket 1, respectively. The control system is electrically connected to the circulating liquid supply system. This invention achieves non-destructive and efficient cooling of the corrugated tank distribution transformer by seamlessly nesting the liquid-cooled jacket 1 onto the surface of the corrugated sheet 21, combined with a closed-loop circulating liquid supply system and intelligent graded temperature control, significantly extending equipment life and reducing energy consumption.

[0020] Specifically, the liquid cooling jacket 1 is formed by spiraling flat pipes, creating a spiral liquid cooling flow channel inside; the pipe wall of the flat pipes is in contact with the surface of the corrugated sheet 21; the upper end of the flat pipes is the liquid inlet 11, and the lower end of the flat pipes is the liquid outlet 12.

[0021] Specifically, the circulating liquid supply system includes a liquid storage tank 3, a variable frequency circulating pump 4, and a condenser 5 connected in sequence by pipelines. The liquid storage tank 3 stores coolant. In this embodiment, a special coolant with an insulation strength ≥20kV is used. The liquid storage tank 3 is connected to the liquid outlet 12 through the liquid outlet pipeline, and the condenser 5 is connected to the liquid inlet 11 through the liquid inlet pipeline. The pipelines, liquid outlet pipeline, and liquid inlet pipeline are selected as high-voltage resistant insulating hoses and equipped with quick-connect sealing joints to achieve closed-loop circulating cooling.

[0022] Specifically, the control system includes a temperature sensor and a controller. The temperature sensor is installed on the top of the corrugated oil tank 2. The temperature sensor is electrically connected to the controller, and the controller is electrically connected to the variable frequency circulating pump 4.

[0023] To further optimize the technical solution of the present invention, the control system also includes an audible and visual alarm, and the controller is electrically connected to the audible and visual alarm.

[0024] The working process of this invention is as follows: Temperature acquisition steps: The top oil temperature signal and the wall temperature of the corrugated sheet 21 of the transformer are acquired in real time by temperature sensors and transmitted to the controller; Graded control steps: The controller compares the real-time oil temperature with the preset threshold and executes the graded control strategy: When the oil temperature is below the first preset threshold, the system is in a dormant state and relies on the transformer's original corrugated sheet 21 for natural heat dissipation. When the oil temperature reaches the second preset threshold, the variable frequency circulating pump 4 is started to drive the coolant into the cooling jacket 1 along the pipeline. After the coolant exchanges heat with the corrugated fins 21, it flows out through the outlet 12. When the oil temperature reaches the third preset threshold, the condenser 5 is activated to force-cool the return coolant. Over-temperature alarm procedure: When the oil temperature exceeds the fourth preset threshold, the audible and visual alarm is triggered to remind maintenance personnel to check the operating conditions.

[0025] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0026] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An external liquid-cooled temperature control device adapted to a corrugated tank distribution transformer, characterized in that, The system includes a liquid cooling jacket, a circulating liquid supply system, and a control system. The liquid cooling jacket is nested outside the corrugated sheet of the corrugated oil tank and is in contact with its surface. The circulating liquid supply system is connected to the inlet and outlet of the liquid cooling jacket, respectively. The control system is electrically connected to the circulating liquid supply system.

2. The external liquid-cooled temperature control device adapted to a corrugated tank distribution transformer according to claim 1, characterized in that, The liquid cooling jacket is formed by spiraling a flat pipe, creating a spiral liquid cooling channel inside; the pipe wall of the flat pipe is in contact with the surface of the corrugated sheet; the upper end of the flat pipe is the liquid inlet, and the lower end of the flat pipe is the liquid outlet.

3. An external liquid-cooled temperature control device adapted to a corrugated tank distribution transformer according to claim 1 or 2, characterized in that, The circulating liquid supply system includes a liquid storage tank, a variable frequency circulating pump, and a condenser connected in sequence by pipelines. The liquid storage tank is connected to the liquid outlet through a liquid outlet pipeline, and the condenser is connected to the liquid inlet through a liquid inlet pipeline.

4. The external liquid-cooled temperature control device adapted to a corrugated tank distribution transformer according to claim 3, characterized in that, The control system includes a temperature sensor and a controller. The temperature sensor is installed on the top of the corrugated oil tank. The temperature sensor is electrically connected to the controller, and the controller is electrically connected to the variable frequency circulating pump.

5. The external liquid-cooled temperature control device for corrugated tank distribution transformers according to claim 4, characterized in that, The control system also includes an audible and visual alarm, and the controller is electrically connected to the audible and visual alarm.

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