A 66 kV prepackaged substation

Abstract

The utility model discloses a 66kV prefabricated substation. The substation includes transformer and low pressure room, the transformer is split transformer, the split transformer has at least two groups low voltage copper bar, at least two groups low voltage copper bar interval setting along the width direction of split transformer, low pressure room is located close to the low voltage copper bar one side of transformer, and the low voltage room is interval and is equipped with at least two groups low voltage cabinet, and at least two groups low voltage cabinet and at least two groups low voltage copper bar one -to -one corresponding setting, to make corresponding low voltage copper bar and corresponding low voltage cabinet in the electrical component connection. The utility model discloses the transformer is split transformer, and each low voltage cabinet connects a group of low voltage copper bar of transformer, and under the condition that the total current of transformer is invariable, the current of each low voltage copper bar is small, and the heat output of copper bar and connecting point is also reduced greatly, so the heat output of low voltage cabinet can be reduced effectively, and the stability and life of system are improved.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated substation technology, and in particular to a 66kV prefabricated substation. Background Technology

[0002] The photovoltaic industry has developed rapidly in recent years, and the demand for prefabricated photovoltaic substations has been increasing year by year. Power systems are gradually developing towards high-voltage, large-capacity, and long-distance transmission, which also necessitates more flexible and reliable power distribution systems. Low-voltage switchgear used in prefabricated substations typically has a frame structure, using a metal frame for support, and internally houses electrical components such as frame circuit breakers and multiple molded case circuit breakers.

[0003] Currently, offshore photovoltaic prefabricated substations are developing towards larger capacities and higher voltage levels, with 35KV prefabricated substation solutions gradually being replaced by 66KV prefabricated substation solutions. Due to the upgrade in capacity and voltage level, the low-voltage current of the transformer will increase accordingly, thus increasing the heat generated by the low-voltage switchgear during operation. If heat dissipation is not timely, it may lead to overheating of the equipment, affecting its normal operation and lifespan. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a 66kV prefabricated substation that can reduce the heat generation at the connection points of the copper busbars and low-voltage switchgear.

[0005] A 66kV prefabricated substation according to an embodiment of the present invention includes a transformer and a low-voltage compartment. The transformer is a split transformer, and the split transformer has at least two sets of low-voltage copper busbars, which are spaced apart along the width direction of the split transformer. The low-voltage compartment is located on one side of the transformer near the low-voltage copper busbars. At least two sets of low-voltage switchgear are spaced apart in the low-voltage compartment, and the at least two sets of low-voltage switchgear are arranged in a one-to-one correspondence with the at least two sets of low-voltage copper busbars, so that the corresponding low-voltage copper busbars are connected to the electrical components in the corresponding low-voltage switchgear.

[0006] According to an embodiment of the present invention, a 66kV prefabricated substation has at least the following beneficial effects: In the 66kV prefabricated substation of the present invention, the transformer is a split transformer, and each set of low-voltage switchgear is connected to a set of low-voltage copper busbars of the transformer. With the total transformer current remaining constant, the current flowing through each low-voltage copper busbar decreases. According to Joule's law (P = I...),... 2 The heat generation of the copper busbar and connection points is also significantly reduced, thus effectively reducing the heat generation of the low-voltage switchgear and improving the stability and lifespan of the system.

[0007] According to some embodiments of the present invention, a channel is formed between two adjacent sets of low-pressure cabinets, and a channel opening is provided on the side wall of the low-pressure chamber opposite to the channel. The low-pressure chamber is provided with a safety door, which is used to close the channel opening.

[0008] According to some embodiments of the present invention, a heat dissipation space is provided between the top of the low-voltage cabinet and the top wall of the low-voltage chamber, an air inlet is provided at the bottom of the low-voltage cabinet on the side away from the low-voltage copper busbar, an air outlet is provided at the top of the low-voltage cabinet, and an exhaust vent is provided on the side wall of the heat dissipation space.

[0009] According to some embodiments of the present invention, an air cooler is provided on one side of the low-pressure chamber, the inlet of the air cooler is connected to the air inlet, and the outlet of the air cooler is connected to the air outlet.

[0010] According to some embodiments of the present invention, the air cooler is equipped with a fan, which is used to draw hot air from the low-pressure chamber or deliver cold air to the low-pressure chamber.

[0011] According to some embodiments of this utility model, the low-voltage cabinet is provided with double doors to facilitate the later maintenance of the low-voltage cabinet.

[0012] According to some embodiments of the present invention, a baffle is provided on the side of the passage away from the safety door.

[0013] According to some embodiments of the present invention, the substation further includes a base, and the transformer and the low-voltage chamber are both fixed on the base.

[0014] According to some embodiments of the present invention, the substation further includes a high-voltage room, which is located on the side of the transformer opposite to the low-voltage room.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a three-dimensional schematic diagram of a 66kV prefabricated substation according to an embodiment of the present invention.

[0018] Figure 2 This is a layout diagram of the low-voltage switchgear of a 66kV prefabricated substation according to an embodiment of the present invention.

[0019] Figure 3This is a schematic diagram showing the arrangement of the air inlet and outlet of the low-voltage switchgear in a 66kV prefabricated substation according to an embodiment of the present invention.

[0020] Figure 4 This is a three-dimensional schematic diagram of an air cooler for a 66kV prefabricated substation according to an embodiment of the present invention.

[0021] Icon labels:

[0022] Transformer 100, low-voltage copper busbar 110, base 120;

[0023] Low-pressure room 200, low-pressure cabinet 210, double door 211, air inlet 212, air outlet 213, passage 220, safety door 230, baffle 240;

[0024] Air cooler 300, fan 310, air inlet duct 320, first air inlet 321, first air outlet 322, air outlet duct 330, second air inlet 331, second air outlet 332;

[0025] High-pressure chamber 400. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the orientation descriptions, such as left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] Reference Figure 1 , Figure 2 , Figure 3 This utility model provides a 66kV prefabricated substation, including a transformer 100, a high-voltage compartment 400, and a low-voltage compartment 200. The high-voltage end of the transformer 100 is connected to the electrical components in the high-voltage compartment 400, and the low-voltage end of the transformer 100 is connected to the electrical components in the low-voltage compartment 200. The transformer 100 is a split transformer 100, which refers to a multi-winding power transformer 100 where each phase consists of one high-voltage winding and two or more low-voltage windings with the same voltage and capacity. Normal power transmission in the split transformer 100 occurs only between the high-voltage and low-voltage windings, while in the event of a fault, it limits the short-circuit current. Several branches have the same capacity and rated voltage, and can operate individually or in parallel, and can handle the same or different loads. When the load or power supply connected to one of the low-voltage windings fails, the remaining low-voltage windings can still operate normally. There is no electrical connection between the split windings, and the magnetic coupling is relatively weak. The low-voltage winding is split into two or three branches, thus the split transformer 100 has two or three sets of low-voltage copper busbars 110, which are spaced apart along the width of the split transformer 100. The low-voltage chamber 200 is located on one side of the transformer 100 near the low-voltage copper busbars 110. Two or three sets of low-voltage cabinets 210 are spaced apart in the low-voltage chamber 200. The two or three sets of low-voltage cabinets 210 are arranged in a one-to-one correspondence with the two or three sets of low-voltage copper busbars 110 of the transformer 100, so that the corresponding low-voltage copper busbars 110 are connected to the electrical components in the corresponding low-voltage cabinets 210.

[0031] Reference Figure 1 , Figure 2 , Figure 3 In this embodiment, the split winding of the transformer 100 is split into two branches. That is, the split transformer 100 has two sets of low-voltage copper busbars 110. The two sets of low-voltage copper busbars 110 are spaced apart along the width direction of the split transformer 100. Correspondingly, two sets of low-voltage cabinets 210 are spaced apart in the low-voltage chamber 200. The two sets of low-voltage cabinets 210 are arranged in a one-to-one correspondence with the two sets of low-voltage copper busbars 110 of the transformer 100.

[0032] This utility model provides a 66kV prefabricated substation, in which the transformer 100 is a split transformer. Each set of low-voltage switchgear 210 is connected to a set of low-voltage copper busbars 110 of the transformer 100. With the total current of the transformer 100 remaining constant, the current flowing through each low-voltage copper busbar 110 decreases. According to Joule's law (P = I...),... 2 The heat generation of the copper busbar and connection points is also significantly reduced, thus effectively reducing the heat generation of the low-voltage switchgear 210 and improving the stability and lifespan of the system.

[0033] It should be noted that in some embodiments, the split winding of the transformer 100 can also be split into three branches, that is, the split transformer has three sets of low-voltage copper busbars 110, the three sets of low-voltage copper busbars 110 are spaced apart along the width direction of the split transformer, and correspondingly, three sets of low-voltage cabinets 210 are spaced apart in the low-voltage chamber 200, and the three sets of low-voltage cabinets 210 are arranged one-to-one with the three sets of low-voltage copper busbars 110 of the transformer 100.

[0034] The low-pressure chamber 200 is a closed structure, and the low-pressure cabinet 210 is not connected to the external environment. The overall anti-corrosion level requirement can be appropriately reduced, thus saving costs.

[0035] Reference Figure 1 , Figure 2 , Figure 3 In some embodiments, a passage 220 is formed between two adjacent sets of low-voltage switchgear 210. The side wall of the low-voltage chamber 200 opposite to the passage 220 is provided with a passage opening. The low-voltage chamber 200 is provided with a safety door 230, which is used to close the passage opening. The passage 220 can be used for the passage of installation and maintenance personnel, which facilitates the later maintenance of the low-voltage switchgear 210, thereby making reasonable use of the space inside the prefabricated substation.

[0036] Reference Figure 2 , Figure 3 In some embodiments, there is a gap between the top of the low-voltage cabinet 210 and the top wall of the low-voltage chamber 200, thereby forming a heat dissipation space between the top of the low-voltage cabinet 210 and the top wall of the low-voltage chamber 200. An air inlet 212 is provided at the bottom of the low-voltage cabinet 210 on the side opposite to the low-voltage copper busbar 110, for communication with the outside of the low-voltage cabinet 210. An air outlet 213 is provided at the top of the low-voltage cabinet 210, and exhaust vents are provided on the side walls of the heat dissipation space. The heat generated during operation of the low-pressure cabinet 210 heats the air inside the cabinet. The hot air flows and is discharged from the low-pressure cabinet 210 through the air outlet 213 on the top of the cabinet and the exhaust vent on the side wall of the heat dissipation space. At the same time, cold air from outside the low-pressure cabinet 210 enters the low-pressure cabinet 210 through the air inlet 212 at the bottom of the cabinet. The cold air entering the low-pressure cabinet 210 absorbs the heat generated during operation and is then discharged through the air outlet 213 and the exhaust vent.

[0037] Understandably, to accelerate airflow within the low-voltage switchgear 210, a fan can be installed at the air inlet 212 or the air outlet.

[0038] Reference Figure 1 , Figure 4In some embodiments, an air cooler 300 is provided on one side of the low-pressure chamber 200. The inlet of the air cooler 300 is connected to the air inlet 212, and the outlet of the air cooler 300 is connected to the air outlet. A fan 310 is provided inside the air cooler 300. The fan 310 is used to draw hot air from the low-pressure chamber 200 or deliver cold air to the low-pressure chamber 200. The air cooler 300 can accelerate the airflow inside the low-pressure cabinet 210. After the air enters, it flows upward, carrying away the heat inside the low-pressure cabinet 210. This cycle is beneficial to the heat dissipation of the low-pressure cabinet 210, improving the stability and lifespan of the system.

[0039] Specifically, refer to Figure 4 The air cooler 300 has an air inlet channel 320 and an air outlet channel 330. The air inlet channel 320 has a first air inlet 321 and a first air outlet 322. The first air inlet 321 is connected to the outside, and the first air outlet 322 is connected to the air inlet 212 on the low-voltage switchgear 210. The air outlet channel 330 has a second air inlet 331 and a second air outlet 332. The second air inlet 331 is connected to the exhaust port on the side wall of the heat dissipation space, and the second air outlet 332 is connected to the outside. The air outlet channel 330... A fan 310 is installed inside. When the fan 310 is turned on, cold air from outside can enter the air intake channel 320 through the first air inlet 321, and then enter the low-voltage cabinet 210 through the first air outlet 322. After heat exchange in the low-voltage cabinet 210, the cold air becomes hot air. Under the suction of the fan 310, the hot air is discharged from the air cooler 300 through the air outlet 213 on the top of the low-voltage cabinet 210, the heat dissipation space and the air outlet channel 330. This cycle is repeated to achieve the purpose of heat exchange and cooling of the low-voltage cabinet 210.

[0040] Reference Figure 2 , Figure 3 In some embodiments, the low-voltage cabinet 210 is provided with a double door 211, which is located on the side facing the passage 220 to facilitate the later maintenance of the low-voltage cabinet 210.

[0041] Reference Figure 2 , Figure 3 In some embodiments, a baffle 240 is provided on the side of the channel 220 away from the safety door 230. The baffle 240 is used to separate the two sets of low-voltage copper busbars 110, thereby playing a role in safety protection.

[0042] Reference Figure 1 In some embodiments, the substation also includes a base 120, on which the transformer 100 and the low-voltage chamber 200 are fixed. The base 120 integrates the transformer 100 and the low-voltage chamber 200 into one unit, which is beneficial for their combination and facilitates transportation and on-site installation.

[0043] Reference Figure 1The high-voltage compartment 400 is located on the side of the transformer 100 opposite to the low-voltage compartment 200. That is, the transformer 100 is located in the middle, and the high-voltage compartment 400 and the low-voltage compartment 200 are respectively located on opposite sides of the transformer 100. The high-voltage compartment 400, the low-voltage compartment 200 and the transformer 100 are fixed together to form a prefabricated substation. Compared with the traditional prefabricated substations that place the high-voltage compartment 400 and the low-voltage compartment 200 on the same side of the transformer 100, the width of the prefabricated substation of this utility model is reduced, making it easier for vehicles to transport.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A 66 kV prepackaged substation, characterized in that, include: A transformer, wherein the transformer is a split transformer, the split transformer having at least two sets of low-voltage copper busbars, the at least two sets of low-voltage copper busbars being spaced apart along the width direction of the split transformer; A low-voltage compartment is located on one side of the transformer near the low-voltage copper busbar. At least two sets of low-voltage switchgear are spaced apart within the low-voltage compartment, with each set corresponding to one set of low-voltage copper busbars, so that the corresponding low-voltage copper busbars are connected to the electrical components within the corresponding low-voltage switchgear. A passageway is formed between adjacent sets of low-voltage switchgear, and an opening is provided on the side wall of the low-voltage compartment opposite to the passageway. The low-voltage compartment is equipped with a safety door for closing the passageway opening. A heat dissipation space exists between the top of the low-voltage switchgear and the top wall of the low-voltage compartment. An air inlet is located at the bottom of the low-voltage switchgear on the side away from the low-voltage copper busbar, and an air outlet is located at the top of the low-voltage switchgear. An exhaust vent is located on the side wall of the heat dissipation space. An air cooler is located on one side of the low-voltage compartment, with its inlet connected to the air inlet and its outlet connected to the exhaust vent.

2. A 66 kV prepackaged substation according to claim 1, characterized in that, The air cooler is equipped with a fan, which is used to draw hot air from the low-pressure chamber or deliver cold air to the low-pressure chamber.

3. A 66 kV prepackaged substation according to claim 1, characterized in that, The low-voltage switchgear is equipped with double doors to facilitate its later maintenance.

4. A 66 kV prepackaged substation according to claim 1, characterized in that, The passageway is equipped with a baffle on the side away from the safety door.

5. A 66 kV prepackaged substation according to claim 1, characterized in that, The substation also includes a base, on which the transformer and the low-voltage chamber are fixed.

6. A 66 kV prepackaged substation according to claim 1, characterized in that, The substation also includes a high-voltage room, which is located on the side of the transformer opposite to the low-voltage room.

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