Box-type substation

Abstract

The utility model discloses a box-type transformer station, which relates to the technical field of photovoltaic power generation and comprises a high-voltage chamber, a transformer chamber, a low-voltage chamber, a composite apparatus, a transformer and a low-voltage unit, the transformer chamber and the low-voltage chamber are arranged on the same side of the high-voltage chamber, and the top of the high-voltage chamber and the top of the low-voltage chamber are arranged at the same height. The top of the high-voltage chamber and the low-voltage chamber is provided with a top cover, and the bottom of the top cover is provided with heating films corresponding to the high-voltage chamber and the low-voltage chamber. The combined electric appliance is arranged in the high-voltage chamber and comprises a high-voltage circuit breaker, and a grounding switch and an isolating switch which are connected with the high-voltage circuit breaker; the transformer is accommodated in the transformer chamber, and a high-voltage bushing of the transformer is connected with the high-voltage circuit breaker; and the low-voltage unit is arranged in the low-voltage chamber and is connected with a low-voltage sleeve of the transformer. The box-type transformer substation is more reasonable in arrangement and better in reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic power generation technical field, especially relate to a box type substation. BACKGROUND

[0002] With the global attention to clean energy and the transformation of energy structure, the photovoltaic power generation market demand continues to grow, high altitude area has the unique light resource because of the air is thin, the transparency is high, etc. ; This sufficient, stable sunshine condition provides the good natural basis for photovoltaic power generation, makes photovoltaic power generation system can obtain more illumination and longer sunshine time, thereby improves the power generation efficiency.

[0003] The box type substation for high altitude currently adopts L-shaped arrangement, high voltage adopts SF6 gas-filled cabinet, but in high altitude area, the gas pressure in the gas-filled cabinet and the pressure difference of external environment increase, and the gas leakage phenomenon is easy to cause, which affects the normal operation, and because the temperature difference is big in plateau area, the overall operation performance of the box type substation is also affected, and the reliability is poor. UTILITY MODEL CONTENTS

[0004] The utility model discloses a box type substation, which aims to solve the technical problem of poor reliability of the existing box type substation applied in high altitude area.

[0005] To achieve the above-mentioned purpose, the utility model provides a box type substation, which is applied in high altitude photovoltaic power generation, and comprises:

[0006] A high-voltage chamber, a transformer chamber and a low-voltage chamber are provided, the transformer chamber and the low-voltage chamber are arranged on the same side of the high-voltage chamber, the top of the high-voltage chamber and the top of the low-voltage chamber are arranged at the same height, and the top of the high-voltage chamber and the top of the low-voltage chamber are provided with a top cover, and the bottom of the top cover is provided with a heating film corresponding to the positions of the high-voltage chamber and the low-voltage chamber.

[0007] A combined electrical apparatus is arranged in the high-voltage chamber, and the combined electrical apparatus comprises a high-voltage circuit breaker, a grounding switch and a disconnector connected with the high-voltage circuit breaker.

[0008] A transformer is accommodated in the transformer chamber, and a high-voltage bushing of the transformer is connected with the high-voltage circuit breaker.

[0009] A low-voltage unit is arranged in the low-voltage chamber, and the low-voltage unit is connected with a low-voltage bushing of the transformer.

[0010] In an embodiment, a partition is arranged in the high-voltage chamber, the high-voltage chamber has a first installation space and a second installation space on opposite sides of the partition, the first installation space is between the second installation space and the low-voltage chamber, the high-voltage circuit breaker is arranged on the partition and in the first installation space, the high-voltage circuit breaker is spaced apart from the bottom of the high-voltage chamber, and the disconnector is arranged in the second installation space.

[0011] In an embodiment, an insulator and a hanging copper bar are further arranged in the second installation space, the insulator is horizontally spaced apart from the disconnector, and the hanging copper bar is arranged between the insulator and the disconnector.

[0012] In an embodiment, a high-voltage arrester connected with the high-voltage circuit breaker is further arranged on the partition, and the high-voltage arrester is arranged in the second installation space, the high-voltage arrester is inclined upward from one end close to the partition to the other end away from the partition.

[0013] In an embodiment, a high-voltage current transformer is further arranged in the first installation space, the high-voltage circuit breaker is connected with the high-voltage current transformer through a connecting copper bar, and the high-voltage current transformer is connected with the high-voltage bushing of the transformer through a high-voltage line.

[0014] In an embodiment, a ventilation opening is arranged in the high-voltage chamber, the ventilation opening is located on the side of the high-voltage chamber adjacent to the low-voltage chamber, and an exhaust fan is arranged on the side of the high-voltage chamber away from the ventilation opening for exhausting gas in the high-voltage chamber to the outside of the high-voltage chamber.

[0015] In an embodiment, a low-voltage cabinet is arranged in the low-voltage chamber, the low-voltage unit includes a molded case circuit breaker and a frame circuit breaker arranged in the low-voltage cabinet, the frame circuit breaker is arranged above the molded case circuit breaker, and the molded case circuit breaker and the low-voltage bushing are connected with the frame circuit breaker.

[0016] In an embodiment, the number of molded case circuit breakers is multiple, and multiple molded case circuit breakers are arranged in the low-voltage chamber in sequence in the horizontal direction.

[0017] In an embodiment, the low-voltage unit further includes a UPS power supply, an auxiliary transformer, and a low-voltage current transformer arranged in series, the UPS power supply and the auxiliary transformer are arranged outside the low-voltage cabinet, and the low-voltage current transformer is arranged in the low-voltage cabinet.

[0018] In an embodiment, the low-voltage cabinet is provided with an air inlet corresponding to the position of the frame circuit breaker, and the low-voltage cabinet is provided with an air outlet away from the air inlet; and an air blower is arranged on the low-voltage cabinet corresponding to the air inlet, and the air blower is used for blowing air towards the air inlet.

[0019] The box-type substation of the utility model, through setting high-pressure chamber and low-pressure chamber adjacent and equal height, using a top cover can cover the top of high-pressure chamber and low-pressure chamber, the arrangement is more reasonable, ensure the compact structure of box-type transformer;In high-pressure chamber, three-in-one combined electric appliance integrated with high-voltage circuit breaker, disconnecting switch and grounding switch, can better adapt to high-altitude area environment, the vacuum arc-extinguishing chamber formed by high-voltage circuit breaker has better sealing performance in high-altitude area, and has better reliability;In addition, heating film is arranged at the bottom of top cover, and the heating film can ensure that the temperature of the top of high-pressure chamber and the top of low-pressure chamber is balanced, prevents condensation of top cover in low-temperature environment of high-altitude area, thereby avoiding the influence of condensation drop on the normal operation of combined electric appliance in high-pressure chamber and low-voltage unit in low-pressure chamber, and has good reliability. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creative labor.

[0021] Figure 1 The utility model provides the box-type substation one embodiment's plan view for the utility model provides the box-type substation one embodiment's plan view;

[0022] Figure 2 The utility model provides the box-type substation one embodiment's plan view for the utility model provides the box-type substation one embodiment's plan view;

[0023] Figure 3 The utility model provides the box-type substation one embodiment's plan view for the utility model provides the box-type substation one embodiment's plan view;

[0024] EXPLANATION OF DRAWINGS:

[0025] 100, box-type substation; 1, high-voltage chamber; 11, combined electrical apparatus; 111, high-voltage circuit breaker; 112, grounding switch; 113, disconnecting switch; 114, insulator; 115, hanging copper bar; 116, high-voltage arrester; 117, high-voltage current transformer; 118, connecting copper bar; 12, partition; 13, first installation space; 14, second installation space; 2, low-voltage chamber; 21, low-voltage unit; 211, frame circuit breaker; 212, molded case circuit breaker; 213, UPS power supply; 214, auxiliary transformer; 215, low-voltage current transformer; 22, low-voltage cabinet; 23, hair dryer; 3, transformer chamber; 31, transformer; 311, high-voltage bushing; 4, top cover; 41, heating film.

[0026] The realization, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0028] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0029] In addition, if the embodiments of the utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the utility model.

[0030] With the global attention to clean energy and the transformation of energy structure, the market demand of photovoltaic power generation continues to grow. Due to the reasons such as thin air and high transparency, high-altitude areas usually have unique light resources. Such sufficient and stable sunlight conditions provide a good natural basis for photovoltaic power generation, so that the photovoltaic power generation system can obtain more light and longer sunshine time, thereby improving the power generation efficiency.

[0031] At present, the box-type substation commonly used in high altitude adopts L-shaped arrangement, and SF6 gas-filled cabinet is used for high voltage. However, in high-altitude areas, the air pressure is low, the pressure difference between the gas in the gas-filled cabinet and the external environment increases, and the gas leakage phenomenon is easily caused, which affects the normal operation. In addition, due to the large temperature difference in plateau areas, the overall operation performance of the box-type substation is also affected, and the reliability is poor.

[0032] The utility model provides a box-type substation 100.

[0033] Please refer to Figures 1-3 In an embodiment of the utility model, the box-type substation 100 is applied to high-altitude photovoltaic power generation. The box-type substation 100 includes a high-voltage chamber 1, a transformer chamber 3, a low-voltage chamber 2, a combined electrical apparatus 11, a transformer 31 and a low-voltage unit 21. The transformer chamber 3 and the low-voltage chamber 2 are arranged on the same side of the high-voltage chamber 1. The top of the high-voltage chamber 1 and the top of the low-voltage chamber 2 are arranged at the same height, and the top of the high-voltage chamber 1 and the top of the low-voltage chamber 2 are provided with a top cover 4. The bottom of the top cover 4 is provided with a heating film 41 corresponding to the positions of the high-voltage chamber 1 and the low-voltage chamber 2. The combined electrical apparatus 11 is arranged in the high-voltage chamber 1. The combined electrical apparatus 11 includes a high-voltage circuit breaker 111, a grounding switch 112 connected with the high-voltage circuit breaker 111 and a disconnecting switch 113. The transformer 31 is accommodated in the transformer chamber 3. The high-voltage bushing 311 of the transformer 31 is connected with the high-voltage circuit breaker 111. The low-voltage unit 21 is arranged in the low-voltage chamber 2. The low-voltage unit 21 is connected with the low-voltage bushing of the transformer 31.

[0034] It should be noted that, in Figure 1 From the perspective of the top view, the high-voltage panel and the low-voltage panel of the transformer 31 are arranged in the adjacent two sides of the transformer 31 in L shape. The high-voltage panel is connected with the high-voltage chamber 1, and the low-voltage panel is connected with the low-voltage chamber 2. At the same time, it can also be regarded that the transformer chamber 3 and the low-voltage chamber 2 are located on the same side of the high-voltage chamber 1.

[0035] The utility model discloses a box -type substation 100, through with high -voltage chamber 1 and low -voltage chamber 2 adjacent and isopotent setting, adopt one top cover 4 can cover the top of high -voltage chamber 1 and low -voltage chamber 2, and the arrangement is more reasonable, ensure the compact structure of box -type transformer 31, in high -voltage chamber 1 adopts high -voltage circuit breaker 111, disconnecting switch 113, earthing switch 112 three integrated three -in -one combination electric appliance 11, can better adapt to high altitude area environment, the vacuum arc-extinguishing chamber formed by high -voltage circuit breaker 111 has better sealing performance in high altitude area, and the reliability is better, in addition, the bottom of top cover 4 is provided with heating film 41, and heating film 41 can guarantee the temperature balance of high -voltage chamber 1 top and low -voltage chamber 2 top, prevents the top cover 4 from producing condensation under the low temperature environment of high altitude area, thereby avoiding the influence of condensation drop to the normal operation of combination electric appliance 11 in high -voltage chamber 1 and low -voltage unit 21 in low -voltage chamber 2, and the reliability is good.

[0036] Specifically, high -voltage circuit breaker 111 adopts high -voltage vacuum circuit breaker in prior art, high -voltage circuit breaker 111 adopts thickening high insulation and weather -resistant insulating material, and the insulating sleeve of disconnecting switch 113 is thickened, to further ensure that the insulating sleeve has sufficient strength when disconnecting switch 113 is opened and closed.

[0037] It should be noted that the earthing switch 112 in the combination electric appliance 11 is mechanically interlocked with the disconnecting switch 113 and the high -voltage circuit breaker 111 inside to form a lock, thereby ensuring that the high -voltage circuit breaker 111 and the disconnecting switch 113 are both in a disconnected state when the earthing switch 112 is opened and closed, and the safety and reliability are good.

[0038] In an embodiment, according to the arrangement of the combination electric appliance 11 in the high -voltage chamber 1, the heating film 41 on the top of the high -voltage chamber 1 covers at least the upper area of the earthing switch 112 and the disconnecting switch 113, thereby preventing condensation from affecting the performance of the earthing switch 112 and the disconnecting switch 113, and further saving the cost of the heating film.

[0039] Furthermore, the contacts of the high -voltage circuit breaker 111, the disconnecting switch 113 and the earthing switch 112 are all plated with silver, which improves the connection stability, reduces the current value, reduces the generation of overvoltage, and improves the arc-extinguishing performance.

[0040] In an embodiment, a partition 12 is provided in the high -voltage chamber 1, the high -voltage chamber 1 has a first installation space 13 and a second installation space 14 located on opposite sides of the partition 12, the first installation space 13 is located between the second installation space 14 and the low -voltage chamber 2, the high -voltage circuit breaker 111 is installed on the partition 12 and located in the first installation space 13, the high -voltage circuit breaker 111 and the bottom of the high -voltage chamber 1 are spaced apart, and the disconnecting switch 113 is located in the second installation space 14.

[0041] It can be understood that the high-voltage chamber 1 has the first installation space 13 and the second installation space 14 arranged adjacent to each other, the first installation space 13 and the second installation space 14 are separated by the partition plate 12, and the high-voltage circuit breaker 111 is arranged on the partition plate 12, so that the structure is reasonably arranged and the line planning is facilitated; the high-voltage circuit breaker 111 is arranged at intervals with the bottom of the high-voltage chamber 1, and has a good insulation distance.

[0042] In an embodiment, the second installation space 14 is further provided with an insulator 114 and a hanging copper bar 115, the insulator 114 is arranged horizontally at intervals with the disconnector 113, and the hanging copper bar 115 is arranged between the insulator 114 and the disconnector 113.

[0043] It should be noted that the lower opening of the disconnector 113 is provided with the hanging copper bar 115 for hanging cables, so as to provide the outgoing line for the high-voltage cable to be hung. Specifically, the insulator 114 and the hanging copper bar 115 both have gaps with the bottom of the high-voltage chamber 1.

[0044] In an embodiment, the partition plate 12 is further provided with a high-voltage arrester 116 connected with the high-voltage circuit breaker 111, and the high-voltage arrester 116 is located in the second installation space 14, and the high-voltage arrester 116 is arranged in an upward inclination from one end close to the partition plate 12 to the other end away from the partition plate 12. It can be understood that it should be noted that the high-voltage arrester 116 is arranged on the left side of the grounding switch 112, and the high-voltage arrester 116 has a cable for being connected to the hanging copper bar 115. It should be noted that the high-voltage arrester 116 can adopt the high-voltage arrester 116 in the prior art.

[0045] In an embodiment, the first installation space 13 is further provided with a high-voltage current transformer 117, the high-voltage circuit breaker 111 is connected with the high-voltage current transformer 117 through a connecting copper bar 118, and the high-voltage current transformer 117 is connected with the high-voltage bushing 311 of the transformer 31 through a high-voltage line. It can be understood that the high-voltage current transformer 117 is mainly used for protection and current measurement. Specifically, the high-voltage current transformer 117, the high-voltage arrester 116, the high-voltage circuit breaker 111, the disconnector 113 and the grounding switch 112 are connected through a tinned round copper stranded wire.

[0046] Specifically, the high-voltage current transformer 117 is arranged at the bottom of the low-voltage cabinet 22, so as to ensure that it has high stability.

[0047] In an embodiment, the high-voltage chamber 1 is provided with a ventilation opening (not shown) on the side adjacent to the low-voltage chamber 2, and an air extractor (not shown) is arranged on the side of the high-voltage chamber 1 away from the ventilation opening to extract the gas in the high-voltage chamber 1. It can be understood that, by arranging the ventilation opening on the high-voltage chamber 1 and the air extractor on the side away from the high-voltage chamber 1, the air extractor can extract the air in the high-voltage chamber 1, thereby reducing the temperature during the operation of the combined electric appliance 11 and ensuring the normal operation of the combined electric appliance 11.

[0048] Specifically, the ventilation opening is arranged at the lower position of the front side of the high-voltage chamber 1, and the air extractor is arranged at the upper position of the rear side of the high-voltage chamber 1, so as to ensure the air flow in the entire high-voltage chamber 1.

[0049] In an embodiment, the low-voltage chamber 2 is provided with a low-voltage cabinet 22, and the low-voltage unit 21 includes a molded case circuit breaker 212 and a frame circuit breaker 211 arranged in the low-voltage cabinet 22, the frame circuit breaker 211 is arranged above the molded case circuit breaker 212, and the molded case circuit breaker 212 and the low-voltage bushing are connected with the frame circuit breaker 211. It can be understood that, by arranging the molded case circuit breaker 212 below the frame circuit breaker 211, the wiring terminals of the frame circuit breaker 211 and the molded case circuit breaker 212 can be connected by copper bars, thereby achieving reasonable arrangement and compact structure.

[0050] In an embodiment, the number of the molded case circuit breaker 212 is multiple, and the multiple molded case circuit breakers 212 are arranged in the low-voltage chamber 2 in sequence along the horizontal direction. It can be understood that, by arranging the multiple molded case circuit breakers 212 in sequence and at intervals, the space planning in the low-voltage cabinet 22 is more reasonable, the layout is more compact, and there is enough safety distance between the molded case circuit breakers 212, which can adapt to different models of the molded case circuit breaker 212 and has a wider selection range.

[0051] In an embodiment, the low-voltage unit 21 further includes a UPS power supply, an auxiliary transformer 214, and a low-voltage current transformer 215 arranged in series, the UPS power supply and the auxiliary transformer 214 are arranged outside the low-voltage cabinet 22, and the low-voltage current transformer 215 is arranged in the low-voltage cabinet 22. The auxiliary transformer 214 is used to meet the power supply demand of the secondary components in the box-type substation 100, and the UPS power supply supplies power to the internal components of the box-type substation 100 in the case of power failure of the box-type substation 100.

[0052] In an embodiment, the low-voltage cabinet 22 is provided with an air inlet corresponding to the position of the frame circuit breaker 211, and an air outlet corresponding to the position away from the air inlet; and a blower 23 is arranged outside the low-voltage cabinet 22 corresponding to the air inlet, and the blower 23 is used to blow air towards the air inlet.

[0053] It can be understood that the low-voltage cabinet 22 is provided with an air inlet and an air outlet, and a blower 23 is arranged at the air inlet position, the blower 23 can blow air from the air inlet to the low-voltage cabinet 22, and the air can blow to the frame circuit breaker 211, so as to reduce the temperature of the frame circuit breaker 211 during operation, and ensure normal operation.

[0054] In addition, a blower 23 can be further arranged at the air outlet, and the blower 23 is used for blowing air from the air outlet to the outside of the low-voltage cabinet 22, so as to have the effect of taking out the air in the low-voltage cabinet 22, and the blower 23 at the air inlet and the blower 23 at the air outlet cooperate to make the ventilation effect of the low-voltage cabinet 22 better.

[0055] Further, a rain cover can be detachably arranged at the position corresponding to the air inlet outside the low-voltage chamber 2, so as to avoid rainwater and the like from entering the low-voltage chamber 2 from the air inlet position, and reduce the interference of the elements of the low-voltage unit 21 in the low-voltage chamber 2.

[0056] The above is only an exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and the drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A prefabricated substation, characterized in that, The prefabricated substation is used for high-altitude photovoltaic power generation, and the prefabricated substation includes: The high-voltage chamber, transformer chamber, and low-voltage chamber are located on the same side of the high-voltage chamber. The top of the high-voltage chamber and the top of the low-voltage chamber are at the same height, and the top of the high-voltage chamber and the low-voltage chamber are provided with top covers. The bottom of the top covers is provided with heating films corresponding to the positions of the high-voltage chamber and the low-voltage chamber. A combined electrical appliance, which is installed in the high-voltage room, includes a high-voltage circuit breaker and a grounding switch and a disconnecting switch connected to the high-voltage circuit breaker; A transformer, which is housed in the transformer room, wherein the high-voltage bushing of the transformer is connected to the high-voltage circuit breaker; A low-voltage unit is provided in the low-voltage chamber and is connected to the low-voltage bushing of the transformer.

2. The prefabricated substation as described in claim 1, characterized in that, The high-voltage chamber is provided with a partition, and the high-voltage chamber has a first installation space and a second installation space located on opposite sides of the partition. The first installation space is located between the second installation space and the low-voltage chamber. The high-voltage circuit breaker is installed on the partition and located in the first installation space. The high-voltage circuit breaker and the bottom of the high-voltage chamber are spaced apart. The disconnecting switch is located in the second installation space.

3. The prefabricated substation as described in claim 2, characterized in that, The second installation space is also equipped with insulators and hanging copper busbars. The insulators are horizontally spaced from the disconnecting switch, and the hanging copper busbars are located between the insulators and the disconnecting switch.

4. The prefabricated substation as described in claim 2, characterized in that, The partition is also provided with a high-voltage surge arrester connected to the high-voltage circuit breaker, and the high-voltage surge arrester is located in the second installation space. The high-voltage surge arrester is inclined upward from one end near the partition to the other end away from the partition.

5. The prefabricated substation as described in claim 2, characterized in that, A high-voltage current transformer is also installed in the first installation space. The high-voltage circuit breaker is connected to the high-voltage current transformer via a connecting copper busbar. The high-voltage current transformer is connected to the high-voltage bushing of the transformer via a high-voltage line.

6. The prefabricated substation as described in any one of claims 1 to 5, characterized in that, The high-pressure chamber is provided with a ventilation opening, which is located on the side of the high-pressure chamber adjacent to the low-pressure chamber. An exhaust fan is provided on the side of the high-pressure chamber away from the ventilation opening to draw the gas in the high-pressure chamber to the outside of the high-pressure chamber.

7. The prefabricated substation as described in any one of claims 1 to 5, characterized in that, The low-voltage room is equipped with a low-voltage cabinet. The low-voltage unit includes a molded case circuit breaker and a frame circuit breaker installed in the low-voltage cabinet. The frame circuit breaker is installed above the molded case circuit breaker, and both the molded case circuit breaker and the low-voltage bushing are connected to the frame circuit breaker.

8. The prefabricated substation as described in claim 7, characterized in that, The number of molded case circuit breakers is multiple, and the multiple molded case circuit breakers are arranged sequentially in the low-voltage room along the horizontal direction.

9. The prefabricated substation as described in claim 7, characterized in that, The low-voltage unit also includes a UPS power supply, an auxiliary transformer, and a low-voltage current transformer arranged in series. The UPS power supply and the auxiliary transformer are located outside the low-voltage cabinet, while the low-voltage current transformer is located inside the low-voltage cabinet.

10. The prefabricated substation as described in claim 7, characterized in that, The low-voltage switchgear has an air inlet at the position corresponding to the frame circuit breaker, and the low-voltage switchgear has an air outlet at a position away from the air inlet. A blower is installed on the outside of the low-voltage cabinet at the position corresponding to the air inlet, and the blower is used to blow air towards the air inlet.

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