Box-type substation convenient to overhaul and having high protection performance

Abstract

The invention provides a box-type substation convenient to overhaul and high in protection performance. The box-type substation comprises a skid-mounted platform, a supporting base located on the lower portion of the skid-mounted platform, a box-type substation body fixedly arranged on the upper portion of the skid-mounted platform and a plurality of charging piles. The box-type substation comprises a high-voltage wire inlet cabinet, a high-voltage wire outlet cabinet, a travel switch secondary wire leading high-voltage chamber, a wire inlet cabinet, a wire outlet cabinet and a capacitor cabinet, the access door is arranged on one side of the box-type substation; the movable maintenance platform is arranged on the periphery of the skid-mounted platform in a surrounding manner and can be folded and unfolded; the charging piles are arranged on one side of the box-type transformer substation in a centralized mode or arranged on the two sides of the box-type transformer substation respectively. When the movable maintenance platform is in a folded state, the movable maintenance platform can serve as a box transformer substation protective fence; when the movable maintenance platform is unfolded, the movable maintenance platform can serve as a maintenance platform, in practical application, the charging and battery replacing effects of the transformer substation can be better improved, and equipment transportation is facilitated.

Description

[Technical field]

[0001] The present invention relates to the technical field of box-type substation equipment, and in particular to a box-type substation with reasonable structural design, strong stability, convenient maintenance and high protection performance. [Background Technology]

[0002] Box-type transformer (also known as box-type substation) is a high-voltage switchgear, distribution transformer and low-voltage distribution device. It is a factory-prefabricated indoor and outdoor compact distribution equipment arranged in one according to a certain wiring scheme according to the specific usage scenario requirements. It organically combines the functions of high-voltage power receiving, transformer step-down, and low-voltage power distribution. It has the advantages of small size, light weight, low noise, low loss, and high reliability. It is widely used in residential communities, commercial centers, light stations, airports, factories, mines, enterprises, hospitals, schools and other places.

[0003] Since its advent, box-type substations have had the advantages of high degree of combination, factory prefabrication, easy installation, beautiful appearance and low overall cost. However, there are still some shortcomings, such as inconvenience in transfer and transportation, the charging piles cannot be flexibly laid out, and the substation platform cannot be well maintained.

[0004] For example, the utility model patent with application number CN202123267250.6 and patent name "A Smart Charging Pile Box-Type Substation" specifically discloses a smart charging pile box-type substation, which relates to the field of substation technology. The smart charging pile box-type substation includes a body and a fixed seat. The surface of the fixed seat is provided with a groove, and the body is fixedly connected in the groove. The inner wall of the body is fixedly connected to a motor. The end of the motor output shaft is fixedly connected to a rotating rod. The surface of the rotating rod is fixedly connected to bevel gear 1, and the bevel gear 1 is meshed with bevel gear 2. The side wall of the bevel gear 2 is fixedly connected to a round rod. The round rod passes through the side wall of the protective frame and is rotatably connected to the side wall of the protective frame. The protective frame is fixedly connected to the side wall of the body. The round rod passes through the center of the fan and is fixedly connected to the center of the fan. The smart charging pile box-type substation is provided with a placement groove. Under the action of the elastic force of the elastic telescopic rod, the arc block is clamped together with the arc groove to prevent rainwater from splashing onto the charging head and affecting the normal use of the charging pile.

[0005] Based on this, in order to solve some disadvantages of the above-mentioned prior art, it is necessary to further improve and enhance the specific structural parts of the current box-type substation. [Summary of the invention]

[0006] The problems existing in the prior art that this application solves are:

[0007] Since its advent, box-type substations have had the advantages of high degree of combination, factory prefabrication, easy installation, beautiful appearance and low overall cost. However, there are still some shortcomings, such as inconvenience in transfer and transportation, the charging piles cannot be flexibly laid out, and the substation platform cannot be well maintained.

[0008] The solution to the technical problem of the present invention is:

[0009] Provided is a box-type substation that is easy to maintain and has high protection performance, including a skid-mounted platform, a support base at the bottom of the skid-mounted platform, and a box-type substation and multiple charging piles fixedly arranged on the upper part of the skid-mounted platform; the box-type substation includes a high-voltage incoming line cabinet, a high-voltage outgoing line cabinet, a travel switch secondary line leading to a high-voltage room, and adjacent incoming line cabinets, outgoing line cabinets and capacitor cabinets; it also includes an inspection door opened on one side of the box-type substation; it also includes a retractable and deployable movable maintenance platform arranged around the periphery of the skid-mounted platform; the charging piles are concentrated on one side of the box-type substation or are respectively arranged on both sides of the box-type substation; when the movable maintenance platform is in a retracted state, it can serve as a box-type substation guardrail; the movable maintenance platform can serve as a box-type substation guardrail when it is in a retracted state ... When the mobile maintenance platform is unfolded, it can serve as an inspection platform; the movable maintenance platform includes a first platform part rotatably connected to the outer side of the skid-mounted platform and a second platform part movably connected to the other end of the first platform part relative to the skid-mounted platform; when the movable maintenance platform is in the unfolded state, the first platform part is supported by the second platform part in a vertical state; the box-type substation, the charging pile and the skid-mounted platform are separately grounded; it also includes a reflective sign arranged on the outer side of the skid-mounted platform; the first platform part and the second platform part are movably connected by a rotating shaft; it also includes a limit rod arranged on the skid-mounted platform for limiting and maintaining the folded state of the movable maintenance platform.

[0010] Preferably, the outer cover plate of the transformer area of ​​the skid-mounted platform extends to the ground to prevent animals from entering; and a plurality of ventilation holes are respectively provided on one side of the two long sides of the transformer area of ​​the skid-mounted platform.

[0011] Preferably, the skid-mounted platform is a steel structure platform.

[0012] Preferably, the charging pile includes an MCC control unit and an SDD control unit electrically connected to the MCC control unit; the MCC control unit is respectively connected to a function interface expansion box for connecting each functional data line and a charging gun extension box for connecting a charging gun; the MCC control unit includes a central control board, an internal interface board electrically connected to the central control board, at least one charging gun BMS power supply and at least one internal power supply; it also includes a user wiring terminal that is connected to external functional components and provides multiple plug interfaces; the SDD control unit includes an SDD control board, at least one charging module wiring terminal, at least one charging gun power wiring terminal and several relays electrically connected to the SDD control board; the charging module wiring terminal is connected to a first relay through a first connecting line and to a second relay through a second connecting line, and the first relay and the second relay are respectively electrically connected to the charging gun power wiring terminal.

[0013] Preferably, the input ends of the charging gun BMS power supply and the internal power supply are both connected to the external power supply on the user wiring terminal, the output end of the internal power supply is connected to the central control board to supply power to the central control board, and the output end of the charging gun BMS power supply is connected to the internal interface board; the MCC control unit also includes a charging gun BMS interface electrically connected to the internal interface board for connecting to the charging gun.

[0014] Preferably, the box-type substation is a 1250KVA European box-type substation.

[0015] Preferably, the charging pile includes a bottom plate; both sides of the bottom plate are movably connected to sliders; the two sliders are slidably connected to the top of the base towards opposite sides; a mounting groove is provided inside the base, and the bottom end of the mounting groove is fixedly connected to a mounting block; the upper surface of the mounting block is fixedly connected to a buffer block; both sides of the mounting groove are fixedly connected to the connecting block; the surface of the connecting block is fixedly connected to a positioning block; the positioning block is arranged on the surface of the outer side of the buffer block; the surface of the top of the connecting block is provided with a placement groove; a spring is fixedly connected in the placement groove; one end of the spring is fixed in the placement groove, and the other end of the spring is fixedly connected A buffer rod; both sides of the outside of the base are fixedly connected to a rotating shaft; the surface of the rotating shaft is rotatably connected to a pulley; a groove is provided inside the bottom plate; a motor is fixedly installed inside the groove; one output end of the motor is fixedly connected to a screw rod; the surface of the screw rod is movably connected to a fixed sleeve; one side of the screw rod is slidably connected to a sliding block; a sliding groove is provided on one side of the groove; the side of the fixed sleeve away from the sliding block is fixedly connected to a fixed block; one side of the sliding block is fixedly connected to a support column; the top of the bottom plate is fixedly connected to the electric pile body; the surface of the electric pile body is covered with a protective cover; a handle is provided at one end of the electric pile body.

[0016] Preferably, the protection circuit of the charging pile includes a type A residual current protection circuit breaker for detecting AC and pulsating DC residual current, an electric meter for measuring the power value, a contactor connected to the external charging connector and controlling the opening and closing of the charging circuit, a control unit, a signal amplifier, a low-pass filter, and a square wave excitation voltage source for detecting and feedback of smooth DC residual leakage current; the electric meter, signal amplifier, contactor and control unit are electrically connected; the low-pass filter is electrically connected to the square wave excitation voltage source; the type A residual current protection circuit breaker is electrically connected to the electric meter, and a toroidal magnetic core is connected between the connecting line between the type A residual current protection circuit breaker and the electric meter; the square wave excitation voltage source is provided with a secondary coil for exciting and detecting the winding at the toroidal magnetic core.

[0017] Preferably, the bottom of the skid-mounted platform is electrically connected to the high-voltage incoming line cabinet through a high-voltage cable; it also includes a water collection ditch opened in the foundation at the bottom of the box-type transformer; and a movable step ladder is also provided on one side of the skid-mounted platform.

[0018] Preferably, the foundation of the box-type substation is located at a higher place and away from the sewer; a grounding grid is made around the foundation of the box-type substation, and the grounding resistance is not greater than 4 ohms; the upper surface of the foundation can withstand a pressure of not less than 2t / square meter; steel bars are added to the upper surface of the foundation for structural reinforcement; the length of the box-type substation is 4150mm and the width is 1900mm.

[0019] The technical effects of this application in solving the technical problem are as follows:

[0020] Compared with the prior art, the box-type substation of the present invention, which is easy to maintain and has high protection performance, has obvious technical and application advantages. [Brief Description of the Drawings]

[0021] Figure 1 、 Figure 5 and Figure 6 It is a schematic diagram of the planar application state structure of a battery swap station system corresponding to a box-type substation that is easy to maintain and has high protection performance according to the present invention.

[0022] Figure 2 The diagram is a three-dimensional structural diagram of a box-type substation of the present invention that is easy to maintain and has high protection performance.

[0023] Figure 3 The present invention is a schematic structural diagram of a skid-mounted platform of a box-type substation that is easy to maintain and has high protection performance in a folded state.

[0024] Figure 4 The present invention is a schematic structural diagram of a skid-mounted platform of a box-type substation that is easy to maintain and has high protection performance in an expanded state. [Specific implementation method]

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0026] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0028] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

[0029] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0030] The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0031] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0032] See also Figures 1 to 4The present invention provides a box-type substation 1 that is easy to maintain and has high protection performance, including a skid-mounted platform 101, a support base at the bottom of the skid-mounted platform 101, and a box-type substation and multiple charging piles fixedly arranged on the upper part of the skid-mounted platform 101; the box-type substation includes a high-voltage incoming line cabinet, a high-voltage outgoing line cabinet, a travel switch secondary line leading to a high-voltage room, and adjacent incoming line cabinets, outgoing line cabinets and capacitor cabinets; it also includes an inspection door opened on one side of the box-type substation; it also includes a retractable and deployable movable maintenance platform arranged around the periphery of the skid-mounted platform 101; the charging piles are concentrated on one side of the box-type substation or are respectively arranged on both sides of the box-type substation; when the movable maintenance platform is in a retracted state, it can serve as a box-type protective fence; the movable When the mobile maintenance platform is unfolded, it can serve as an inspection platform; the mobile maintenance platform includes a first platform part rotatably connected to the outer side of the skid-mounted platform 101 and a second platform part movably connected to the other end of the first platform part relative to the skid-mounted platform 101; when the mobile maintenance platform is in the unfolded state, the first platform part is supported by the second platform part in the vertical state; the box-type substation, the charging pile and the skid-mounted platform 101 are separately grounded; it also includes a reflective mark arranged on the outer side of the skid-mounted platform 101; the first platform part and the second platform part are movably connected by a rotating shaft; it also includes a limit rod arranged on the skid-mounted platform 11 for limiting and maintaining the folded state of the mobile maintenance platform.

[0033] The present application simultaneously sets up a skid-mounted platform 101, a support base at the bottom of the skid-mounted platform 101, and a box-type substation and multiple charging piles fixedly set on the upper part of the skid-mounted platform 101; the box-type substation includes a high-voltage incoming line cabinet, a high-voltage outgoing line cabinet, a travel switch secondary line leading to a high-voltage room, and adjacent incoming line cabinets, outgoing line cabinets and capacitor cabinets; it also includes an inspection door opened on one side of the box-type substation; it also includes a retractable and deployable movable maintenance platform arranged around the periphery of the skid-mounted platform 101; the charging piles are concentrated on one side of the box-type substation or are respectively arranged on both sides of the box-type substation; when the movable maintenance platform is in the folded state, it can serve as a box-type substation guardrail; when the movable maintenance platform is unfolded, it can serve as a maintenance platform; the movable maintenance platform includes It includes a first platform portion rotatably connected to the outer side of the skid-mounted platform 101 and a second platform portion movably connected to the other end of the first platform portion relative to the skid-mounted platform 101; when the movable maintenance platform is in the unfolded state, the first platform portion is supported by the second platform portion in the vertical state; the box-type substation, the charging pile and the skid-mounted platform 101 are separately grounded; it also includes a reflective mark arranged on the outer side of the skid-mounted platform 101; the first platform portion and the second platform portion are movably connected by a rotating shaft; it also includes a limit rod arranged on the skid-mounted platform 11 for limiting and maintaining the folded state of the movable maintenance platform. In actual application, it can better improve the charging and battery replacement effects of the substation and facilitate the transportation of equipment.

[0034] In some other embodiments, the outer cover of the transformer area of ​​the skid-mounted platform 101 extends to the ground to prevent animals from entering; and a plurality of ventilation holes are respectively provided on one side of the two long sides of the transformer area of ​​the skid-mounted platform 101.

[0035] The skid-mounted platform 101 is a steel structure platform.

[0036] The charging pile includes an MCC control unit and an SDD control unit electrically connected to the MCC control unit; the MCC control unit is respectively connected to a function interface expansion box for connecting each functional data line and a charging gun extension box for connecting a charging gun; the MCC control unit includes a central control board, an internal interface board electrically connected to the central control board, at least one charging gun BMS power supply and at least one internal power supply; it also includes a user wiring terminal that is connected to external functional components and provides multiple plug interfaces; the SDD control unit includes an SDD control board, at least one charging module wiring terminal, at least one charging gun power wiring terminal and several relays electrically connected to the SDD control board; the charging module wiring terminal is connected to a first relay through a first connecting line and to a second relay through a second connecting line, and the first relay and the second relay are respectively electrically connected to the charging gun power wiring terminal.

[0037] The input ends of the charging gun BMS power supply and the internal power supply are both connected to the external power supply on the user wiring terminal, the output end of the internal power supply is connected to the central control board to supply power to the central control board, and the output end of the charging gun BMS power supply is connected to the internal interface board; the MCC control unit also includes a charging gun BMS interface that is electrically connected to the internal interface board and is used to connect to the charging gun.

[0038] The box-type substation is a 1250KVA European-style box-type substation.

[0039] The charging pile includes a bottom plate; both sides of the bottom plate are movably connected to sliders; the two sliders are slidably connected to the top of the base towards opposite sides; a mounting groove is provided inside the base, and the bottom end of the mounting groove is fixedly connected to a mounting block; the upper surface of the mounting block is fixedly connected to a buffer block; both sides of the mounting groove are fixedly connected to the connecting block; the surface of the connecting block is fixedly connected to a positioning block; the positioning block is arranged on the surface of the outer side of the buffer block; a placement groove is provided on the surface of the top of the connecting block; a spring is fixedly connected in the placement groove; one end of the spring is fixed in the placement groove, and the other end of the spring is fixedly connected to the buffer Rod; both sides of the outside of the base are fixedly connected to the rotating shaft; the surface of the rotating shaft is rotatably connected to the pulley; a groove is opened inside the bottom plate; a motor is fixedly installed inside the groove; one output end of the motor is fixedly connected to a screw rod; the surface of the screw rod is movably connected to a fixed sleeve; one side of the screw rod is slidably connected to a sliding block; a sliding groove is opened on one side of the groove; the side of the fixed sleeve away from the sliding block is fixedly connected to the fixed block; one side of the sliding block is fixedly connected to a support column; the top of the bottom plate is fixedly connected to the electric pile body; the surface of the electric pile body is covered with a protective cover; a handle is provided at one end of the electric pile body.

[0040] The protection circuit of the charging pile includes a type A residual current protection circuit breaker for detecting AC and pulsating DC residual current, an electric meter for measuring the power value, a contactor connected to the external charging connector and controlling the opening and closing of the charging circuit, a control unit, a signal amplifier, a low-pass filter, and a square wave excitation voltage source for detecting and feeding back the smooth DC residual leakage current; the electric meter, signal amplifier, contactor and control unit are electrically connected; the low-pass filter is electrically connected to the square wave excitation voltage source; the type A residual current protection circuit breaker is electrically connected to the electric meter, and a toroidal magnetic core is connected between the connecting line between the type A residual current protection circuit breaker and the electric meter; the square wave excitation voltage source is provided with a secondary coil for exciting and detecting the winding at the toroidal magnetic core.

[0041] The bottom of the skid-mounted platform 101 is electrically connected to the high-voltage incoming line cabinet through a high-voltage cable; it also includes a water collection ditch opened in the foundation at the bottom of the box-type transformer; and a movable step ladder is also provided on one side of the skid-mounted platform 101.

[0042] The foundation of the box-type substation is located at a higher altitude and away from the sewer; a grounding grid is made around the foundation of the box-type substation, and the grounding resistance is not greater than 4 ohms; the upper surface of the foundation can withstand a pressure of not less than 2t / square meter; steel bars are added to the upper surface of the foundation for structural reinforcement; the length of the box-type substation is 4150mm and the width is 1900mm.

[0043] See also Figure 1 、 Figure 5 and Figure 6 The present invention provides a box-type substation that is easy to maintain and has high protection performance, and the corresponding battery swap station system includes three application scenarios in different states (10 / 20 / 30); the battery swap station system mainly includes skid-mounted platforms 101 / 201 / 301, battery swap stations 102 / 202 / 302, and battery swap vehicles (103 / 203 / 303 or battery swap areas for parking battery swap vehicles); the battery swap area can also be equipped with vehicle guide lines, battery swap station crash barriers, speed bumps, height limit racks, dry powder fire extinguishers and other functional components and facilities according to actual conditions to improve the application safety and reliability of the battery swap station system;

[0044] It should be clarified that this application does not specifically limit the power level of the transformer;

[0045] The charging pile can also be a flexible charging pile;

[0046] The technical effects of this application in solving the technical problem are as follows:

[0047] Compared with the prior art, the box-type substation 1 of the present invention, which is easy to maintain and has high protection performance, has obvious technical and application advantages.

[0048] The above-described embodiments of the present invention do not limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A box-type substation that is easy to maintain and has high protection performance, characterized by: It includes a skid-mounted platform, a support base at the bottom of the skid-mounted platform, and a box-type substation and multiple charging piles fixedly arranged on the upper part of the skid-mounted platform; the box-type substation includes a high-voltage incoming line cabinet, a high-voltage outgoing line cabinet, a travel switch secondary line leading to a high-voltage room, and adjacent incoming line cabinets, outgoing line cabinets and capacitor cabinets; it also includes an inspection door opened on one side of the box-type substation; it also includes a retractable and deployable movable maintenance platform arranged around the periphery of the skid-mounted platform; the charging piles are concentrated on one side of the box-type substation or are respectively arranged on both sides of the box-type substation; when the movable maintenance platform is in the retracted state, it can serve as a box-type substation guardrail; when the movable maintenance platform is deployed, it can serve as a Maintenance platform; the movable maintenance platform includes a first platform portion rotatably connected to the outer side of the skid-mounted platform and a second platform portion movably connected to the other end of the first platform portion relative to the skid-mounted platform; when the movable maintenance platform is in the unfolded state, the first platform portion is supported by the second platform portion in a vertical state; the box-type substation, the charging pile and the skid-mounted platform are separately grounded; it also includes a reflective sign arranged on the outer side of the skid-mounted platform; the first platform portion and the second platform portion are movably connected via a rotating shaft; it also includes a limit rod arranged on the skid-mounted platform for limiting and maintaining the folded state of the movable maintenance platform.

2. A box-type substation that is easy to maintain and has high protection performance as claimed in claim 1, characterized in that: The outer sealing plate of the box-type transformer area of ​​the skid-mounted platform extends to the ground to prevent animals from entering; a plurality of ventilation holes are respectively provided on one side of the two long sides of the box-type transformer area of ​​the skid-mounted platform.

3. A box-type substation that is easy to maintain and has high protection performance as claimed in claim 1, characterized in that: The skid-mounted platform is a steel structure platform.

4. A box-type substation that is easy to maintain and has high protection performance as claimed in claim 1, characterized in that: The charging pile includes an MCC control unit and an SDD control unit electrically connected to the MCC control unit; the MCC control unit is respectively connected to a function interface expansion box for connecting each functional data line and a charging gun extension box for connecting a charging gun; the MCC control unit includes a central control board, an internal interface board electrically connected to the central control board, at least one charging gun BMS power supply and at least one internal power supply; it also includes a user wiring terminal that is connected to external functional components and provides multiple plug interfaces; the SDD control unit includes an SDD control board, at least one charging module wiring terminal, at least one charging gun power wiring terminal and several relays electrically connected to the SDD control board; the charging module wiring terminal is connected to a first relay through a first connecting line and to a second relay through a second connecting line, and the first relay and the second relay are respectively electrically connected to the charging gun power wiring terminal.

5. A box-type substation that is easy to maintain and has high protection performance as claimed in claim 4, characterized in that: The input ends of the charging gun BMS power supply and the internal power supply are both connected to the external power supply on the user wiring terminal, the output end of the internal power supply is connected to the central control board to supply power to the central control board, and the output end of the charging gun BMS power supply is connected to the internal interface board; the MCC control unit also includes a charging gun BMS interface that is electrically connected to the internal interface board and is used to connect to the charging gun.

6. The box-type substation that is easy to maintain and has high protection performance as claimed in claim 1 is characterized in that: The box-type substation is a 1250KVA European-style box-type substation.

7. The box-type substation that is easy to maintain and has high protection performance as claimed in claim 1 is characterized in that: The charging pile includes a bottom plate; both sides of the bottom plate are movably connected to sliders; the two sliders are slidably connected to the top of the base towards opposite sides; a mounting groove is provided inside the base, and the bottom end of the mounting groove is fixedly connected to a mounting block; the upper surface of the mounting block is fixedly connected to a buffer block; both sides of the mounting groove are fixedly connected to the connecting block; the surface of the connecting block is fixedly connected to a positioning block; the positioning block is arranged on the surface of the outer side of the buffer block; a placement groove is provided on the surface of the top of the connecting block; a spring is fixedly connected in the placement groove; one end of the spring is fixed in the placement groove, and the other end of the spring is fixedly connected to the buffer Rod; both sides of the outside of the base are fixedly connected to the rotating shaft; the surface of the rotating shaft is rotatably connected to the pulley; a groove is opened inside the bottom plate; a motor is fixedly installed inside the groove; one output end of the motor is fixedly connected to a screw rod; the surface of the screw rod is movably connected to a fixed sleeve; one side of the screw rod is slidably connected to a sliding block; a sliding groove is opened on one side of the groove; the side of the fixed sleeve away from the sliding block is fixedly connected to the fixed block; one side of the sliding block is fixedly connected to a support column; the top of the bottom plate is fixedly connected to the electric pile body; the surface of the electric pile body is covered with a protective cover; a handle is provided at one end of the electric pile body.

8. A box-type substation that is easy to maintain and has high protection performance as claimed in claim 7, characterized in that: The protection circuit of the charging pile includes a type A residual current protection circuit breaker for detecting AC and pulsating DC residual current, an electric meter for measuring the power value, a contactor connected to the external charging connector and controlling the opening and closing of the charging circuit, a control unit, a signal amplifier, a low-pass filter, and a square wave excitation voltage source for detecting and feeding back the smooth DC residual leakage current; the electric meter, signal amplifier, contactor and control unit are electrically connected; the low-pass filter is electrically connected to the square wave excitation voltage source; the type A residual current protection circuit breaker is electrically connected to the electric meter, and a toroidal magnetic core is connected between the connecting line between the type A residual current protection circuit breaker and the electric meter; the square wave excitation voltage source is provided with a secondary coil for exciting and detecting the winding at the toroidal magnetic core.

9. The box-type substation that is easy to maintain and has high protection performance as claimed in claim 1, characterized in that: The bottom of the skid-mounted platform is electrically connected to the high-voltage incoming line cabinet through a high-voltage cable; it also includes a water collection ditch opened in the foundation at the bottom of the box-type transformer; and a movable step ladder is also provided on one side of the skid-mounted platform.

10. A box-type substation that is easy to maintain and has high protection performance as claimed in claim 9, characterized in that: The foundation of the box-type substation is located at a higher altitude and away from the sewer; a grounding grid is made around the foundation of the box-type substation, and the grounding resistance is not greater than 4 ohms; the upper surface of the foundation can withstand a pressure of not less than 2t / square meter; steel bars are added to the upper surface of the foundation for structural reinforcement; the length of the box-type substation is 4150mm and the width is 1900mm.

Images