Static change-over switch and energy storage system

Abstract

The utility model discloses a static change-over switch and an energy storage system, the static change-over switch comprises a switch main body, a power grid wiring terminal and a load wiring terminal, the power grid wiring terminal and the load wiring terminal are electrically connected with the switch main body, and the power grid wiring terminal and the load wiring terminal respectively comprise phase connection points of a three-phase electric phase line and a neutral line. The power grid terminal and / or the load terminal are / is provided with at least one phase connection point, the phase connection point and other phase connection points are located on different planes, the switch body is electrically connected with a storage battery through an energy storage converter, the power grid terminal is electrically connected with a power grid, and the load terminal is electrically connected with electric equipment. The static change-over switch can effectively avoid wire harness interference between different wiring end points of the wiring end.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of static transfer switch, especially static transfer switch and energy storage system. BACKGROUND

[0002] Static transfer switch (STS) is a kind of device for switching between two independent power sources (such as grid power supply and standby power supply, or grid and energy storage system) quickly. Its main function is to realize seamless transition from one power source to another while ensuring power supply continuity. This is particularly important in application scenarios that require high reliability and uninterrupted power supply, such as data centers, hospitals, industrial control systems, etc.

[0003] The static transfer switch in the prior art has a grid terminal, a load terminal and the like, each terminal has R, S, T, N (phase points and zero points of three-phase electricity) four connection points, and the terminals of the traditional static transfer switch adopt a flat structure, i.e. the four connection points R, S, T, N are in the same plane. Since static transfer switches are generally used in high-current scenarios, their wires are very thick, and placing the four connection points in the same horizontal plane may cause interference between wires of different phases. SUMMARY

[0004] The utility model solves the technical problems existing in the prior art, provides a static transfer switch and an energy storage system comprising the static transfer switch, which can effectively avoid wire harness interference between different connection points of the terminal.

[0005] To solve the above problems, the utility model adopts the following technical scheme:

[0006] A static transfer switch comprises a switch main body, a grid terminal and a load terminal electrically connected to the switch main body, the grid terminal and the load terminal each comprise phase connection points of three-phase electric phase lines and neutral lines, at least one phase connection point of the grid terminal and / or the load terminal is located in a different plane from other phase connection points, the switch main body is electrically connected to a storage battery through an energy storage converter, the grid terminal is electrically connected to a grid, and the load terminal is electrically connected to an electrical equipment.

[0007] Preferably, the grid terminal and the load terminal each have a stepped structure, and the four phase connection points R, S, T, N of the grid terminal and the load terminal are each located in a different horizontal plane.

[0008] Preferably, the static transfer switch further includes a motor terminal electrically connected to the switch body. The motor terminal is stepped, and the four phase connection points R, S, T, and N of the motor terminal are located in different horizontal planes. The motor terminal is electrically connected to the generator.

[0009] Preferably, the power grid terminal, the load terminal, and the motor terminal are arranged side by side at intervals on the same surface of the switch body.

[0010] Preferably, the height of the protrusion in the middle of the load terminal, the power grid terminal, and the motor terminal is higher than the height of the protrusions on both sides.

[0011] Preferably, the static transfer switch further includes a cabinet, and the switch body is installed inside the cabinet.

[0012] Preferably, the first end of the outer surface of the cabinet is provided with a first connecting part, and the second end of the outer surface of the cabinet opposite to the first end is provided with a second connecting part. When two static changeover switches are connected, the first connecting part on the cabinet of one static changeover switch is connected to the second connecting part on the cabinet of the other static changeover switch.

[0013] Preferably, the first connecting part consists of multiple protrusions on the top of the cabinet, and the second connecting part consists of multiple grooves on the bottom of the cabinet. When the two static changeover switches are connected, the four protrusions on the top of the lower static changeover switch are respectively inserted into the four grooves on the bottom of the upper static changeover switch.

[0014] Preferably, the top of the cabinet is provided with a first cable outlet hole, and the two sides of the cabinet are respectively provided with a second cable outlet hole and a third cable outlet hole.

[0015] Preferably, the outer surface of the switch body is provided with a first hand grip, which is a groove provided on both side walls of the switch body.

[0016] Preferably, the outer surface of the switch body is further provided with a second hand grip. The second hand grip is provided in two sets, and the two sets of second hand grips are symmetrically arranged about the central axis of the switch body. Each set of second hand grips includes an L-shaped plate and a handle. One side of the L-shaped plate is fixed to the side wall of the switch body, and the other side is perpendicular to the side wall of the switch body. The handle is fixedly installed on the side of the L-shaped plate that is perpendicular to the side wall of the switch body.

[0017] Preferably, the static transfer switch further includes a contactor, which is disposed on the circuit between the switch body and the energy storage converter, and an AC terminal is also provided on the side wall of the switch body.

[0018] Preferably, one side or both sides of the switch body also has external connection terminals, which are used for electrical connection of multiple stacked or parallel static transfer switches.

[0019] The utility model also provides a kind of energy storage system, including energy storage converter, the energy storage converter is connected with battery, further including above-mentioned static transfer switch, the static transfer switch can be electrically connected with at least 1 energy storage converter.

[0020] Preferably, the number of static transfer switches is at least two, different static transfer switches are connected in parallel with each other, and each static transfer switch is electrically connected with at least one energy storage converter.

[0021] Compared with the prior art, the utility model has at least the following beneficial effects:

[0022] (1), in the utility model, the power grid terminal, the load terminal, the motor terminal all adopt multilayer's stepped structure, each stepped surface is equipped with one phase connection point in R, S, T, N respectively, to avoid the mutual interference between the thick wires of each phase connection point, so that wiring is more convenient.

[0023] (2), in the utility model, the power grid terminal, the load terminal, the motor terminal are arranged in parallel and spaced on the same face of the switch body, which can effectively improve the efficiency of wiring.

[0024] (3), in the utility model, one side or both sides of the switch body also has external connection terminals, and multiple static transfer switches can be electrically connected through the external connection terminals on the side wall whether stacked or placed in parallel. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the overall three-dimensional schematic diagram of the static transfer switch in the embodiment 1 of the utility model Figure 1 ;

[0026] Figure 2 is the overall three-dimensional schematic diagram of the static transfer switch in the embodiment 1 of the utility model Figure 2 ;

[0027] Figure 3 is the overall three-dimensional schematic diagram of the static transfer switch in the embodiment 1 of the utility model Figure 3 ;

[0028] Figure 4is the first side surface schematic view of the switch body in the embodiment 1 of the utility model;

[0029] Figure 5 is the front surface schematic view of the switch body in the embodiment 1 of the utility model;

[0030] Figure 6 is the second side surface schematic view of the switch body in the embodiment 1 of the utility model;

[0031] Figure 7 is the outgoing line schematic view of single static transfer switch in the embodiment 1 of the utility model;

[0032] Figure 8 is the outgoing line schematic view of two static transfer switches of the utility model embodiment 1 is stacked;

[0033] Figure 9 is the outgoing line schematic view of two static transfer switches of the utility model embodiment 1 is parallelly placed.

[0034] In the drawing: 100-switch main body, 110-grid wiring end, 120-load wiring end, 130-motor wiring end, 140-first handheld part, 150-second handheld part, 151-L-shaped plate, 152-pull handle, 160-contactor, 170-external wiring terminal, 200-cabinet body, 210-first connecting part, 220-second connecting part, 300-first outgoing line hole, 310-second outgoing line hole, 320-third outgoing line hole. DETAILED DESCRIPTION

[0035] The technical solutions in the utility model will be clearly and completely described below with reference to the drawings in the utility model, and obviously, the described embodiments are 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 the person skilled in the art without making creative efforts belong to the scope of the utility model.

[0036] In the description of the utility model, it is necessary to explain that the terms "upper" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience and simplification of description, and are not indicative or suggestive of the device or element indicated must be provided with a particular orientation, constructed and operated with a particular orientation, so it cannot be understood as a limitation on the utility model.

[0037] In the description of the utility model, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicative or suggestive of relative importance.

[0038] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the terms "connect", "arrange", "install", "fix" and the like should be understood in a broad sense, for example, it can be fixedly connected or can be detachably connected, or integrally connected, it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements, for those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] Embodiment 1

[0040] As Figures 1-6 shown, the embodiment discloses a static transfer switch (STS), including switch main body 100, and the power grid wiring end 110 and the load wiring end 120 that are electrically connected with switch main body 100.Power grid wiring end 110 and load wiring end 120 all include three-phase electric phase line and the phase connection point (R, S, T, N four phase connection points) of neutral line. Among them, three-phase line refers to three fire lines in power system. The three lines each bear an alternating current current, and the three currents are 120 degrees apart from each other. This configuration allows three-phase power supply to provide stable and efficient power supply for various loads. The neutral line is a wire drawn from the center point of the transformer. It provides a reference point in the circuit and helps maintain the stability of the phase voltage, especially under asymmetric load conditions. The neutral line is also very important to ensure that single-phase devices can correctly obtain the required operating voltage. Further, R, S, T, N is a term used to identify a three-phase four-wire power system. Among them, R, S, T are used to represent the three different phases of three-phase power, and N represents the neutral line, that is, the line connected to the star point of the three-phase power supply, which provides a common return circuit for the circuit. Simply put, in a three-phase four-wire system marked with R, S, T, N, R, S, T correspond to the three phases of the three-phase power supply, and N represents the neutral line drawn from the neutral point. Such marking helps electricians and technicians accurately install and maintain electrical work.

[0041] Among them, the power grid wiring end 110 and / or the load wiring end 120 at least has a phase connection point with other phase connection points in different planes. The switch main body is electrically connected with the battery through the energy storage converter, the power grid wiring end is electrically connected with the power grid, and the load wiring end is electrically connected with the electrical equipment.

[0042] Specifically, the power grid wiring end and the load wiring end are both stepped structures, and the R, S, T, N four phase connection points of the power grid wiring end and the load wiring end are all located in different horizontal planes. So as to ensure that the wires between different phase points of the power grid wiring end and the load wiring end will not interfere.

[0043] In the embodiment, the static transfer switch further comprises a motor terminal 130 electrically connected with the switch body 100. The motor terminal 130 is also in a stepped shape. Each step surface of the motor terminal 130 is provided with a different connection phase point (R, S, T, N four phase connection points). The motor terminal 130 is electrically connected with the generator. That is, the load device connected through the static transfer switch can adopt three different power supply modes: the power grid as the power supply, the battery as the power supply, and the generator as the power supply. The static transfer switch has the function of seamless switching and guarantees the continuity of power supply. Generally, the switching speed of the static transfer switch is in the millisecond level (usually less than 10 ms), which is much faster than the mechanical switch, and can ensure uninterrupted power supply for the load and is suitable for devices sensitive to power interruption (such as servers and medical devices). In the embodiment, there are off-grid (generator, battery) and grid-connected (power grid) connection modes, which can effectively avoid voltage flash or downtime risks.

[0044] As shown in Figures 4-6 , further, the power grid terminal 110, the load terminal 120, and the motor terminal 130 are arranged in parallel and spaced apart on the same surface of the switch body 100. Specifically, the power grid terminal 110, the load terminal 120, and the motor terminal 130 each include four step surfaces. The four step surfaces are respectively provided with phase connection points of three-phase electricity R, S, T, and a zero point N for grounding. Due to the large current of the circuit, the connecting wires are of a relatively thick size. Such a stepped structure can effectively avoid mutual interference between the thick wires of each phase connection point, making the wiring more convenient.

[0045] As shown in Figure 4 , 5 , further, the load terminal 120 is located in the middle of the power grid terminal 110 and the motor terminal 130. In order to avoid the wire harness of the load terminal 120 located in the middle being disturbed by the wire harnesses of the power grid terminal 110 and the motor terminal 130 on both sides, the protrusion height of the load terminal 120 is higher than the protrusion height of the power grid terminal 110 and the load terminal 120.

[0046] As shown in Figure 1 , the static transfer switch in the embodiment further comprises a cabinet body 200, and the switch body 100 is installed in the cabinet body 200.

[0047] As shown in Figures 4-6 , the outer surface of the switch body 100 is provided with a first hand-held portion 140, which is a groove provided on the two side walls of the switch body 100. The groove is used for a worker to hold the switch body 100 and pull it up or lower it.

[0048] Further, the outer surface of the switch body 100 is provided with a second hand-held part 150, and two groups of the second hand-held part 150 are symmetrically arranged about the central axis of the switch body 100.

[0049] As shown in Figure 5 , each group of the second hand-held part 150 includes an L-shaped plate 151 and a handle 152. One side of the L-shaped plate 151 is fixed on the side wall of the switch body 100 by bolts, and the other side is perpendicular to the side wall of the switch body 100. The handle 152 is fixedly installed on the side of the L-shaped plate 151 which is perpendicular to the side wall of the switch body 100. During the process of installing the switch body 100 into the cabinet 200, the staff can first hold the first hand-held part 140 and place the switch body 100 into the cabinet 200. Then, the staff can hold the second hand-held part 150 to adjust the position of the switch body 100 in the cabinet 200.

[0050] As shown in Figures 1-3 , the first end of the outer surface of the cabinet is provided with a first connecting part 210, and the second end opposite to the first end of the outer surface of the cabinet is provided with a second connecting part 220. When the two static transfer switches are connected, the first connecting part 210 on the cabinet of one of the static transfer switches is docked with the second connecting part 220 on the cabinet of the other static transfer switch.

[0051] Specifically, the first connecting part 210 is four protrusions arranged on the top of the cabinet, and the second connecting part 220 is four recesses arranged on the bottom of the cabinet. The four protrusions and the four recesses are arranged along the circumference of the cabinet and correspond in position. When the two static transfer switches are connected, the four protrusions on the top of the lower static transfer switch are respectively inserted into the four recesses on the bottom of the upper static transfer switch, thereby completing the matching connection of the two static transfer switches.

[0052] As shown in Figure 5 , optionally, the static transfer switch further includes a contactor 160 arranged on the circuit between the switch body 100 and the energy storage inverter. The switch body 100 is electrically connected with the contactor 160, the contactor 160 is electrically connected with the energy storage inverter, and the energy storage inverter is electrically connected with the battery. The contactor 160 is mainly used for remotely and frequently turning on or off a large current circuit, and it serves as a safety device between the switch body 100 and the energy storage inverter.

[0053] Specifically, in this embodiment, five contactors 160 are arranged below the switch body, and each contactor 160 has an RST (corresponding to three-phase power). The RST of each contactor 160 corresponds to the RST of one energy storage inverter. The bottom of the switch body is also provided with a zero line corresponding to each contactor 160.

[0054] AsFigure 4 As shown, the side wall of the switch body 100 is provided with an external terminal 170, and the external terminal 170 is used for electrical connection of multiple stacked or parallel static transfer switches. Specifically, each external terminal 170 includes R, S, T, N phase connection points. Each phase connection point includes a terminal point arranged at the bottom of the external terminal 170 and the top of the external terminal 170. When multiple static transfer switches are stacked, the static transfer switch in the middle is electrically connected to the static transfer switch above it through the terminal point at the top of the external terminal 170, and is electrically connected to the static transfer switch below it through the terminal point at the bottom of the external terminal 170.

[0055] Preferably, the side wall of the switch body 100 is provided with an external terminal 170, and the external terminal 170 is used for electrical connection of multiple stacked or parallel static transfer switches. Specifically, each external terminal 170 includes R, S, T, N phase connection points. Each phase connection point includes a terminal point arranged at the bottom of the external terminal 170 and the top of the external terminal 170. When multiple static transfer switches are stacked, the static transfer switch in the middle is electrically connected to the static transfer switch above it through the terminal point at the top of the external terminal 170, and is electrically connected to the static transfer switch below it through the terminal point at the bottom of the external terminal 170.

[0056] As shown in the figure, Figure 7 As shown, the top of the cabinet is provided with three first wiring holes 300, and the positions of the three first wiring holes 300 correspond to the positions of the grid terminal 110, the load terminal 120, and the motor terminal 130. When a single static transfer switch does not need to be connected to other static transfer switches, the wires of the grid terminal 110, the load terminal 120, and the motor terminal 130 are respectively connected from the three first wiring holes 300.

[0057] As shown in the figure, Figure 8 As shown, the top of the cabinet is provided with three first wiring holes 300, and the top of the cabinet is provided with three first wiring holes 300. The two sides of the cabinet 200 are respectively provided with a second outlet hole 310 and a third outlet hole 320, and the number of the second outlet hole 310 and the third outlet hole 320 is four. The four second outlet holes 310 and the four third outlet holes 320 are stepped and correspond to the positions of the grid terminal 110, the load terminal 120, and the motor terminal 130. When two static transfer switches are stacked, the wires of each phase of the grid terminal 110 and the motor terminal 130 are respectively connected from the corresponding second outlet hole 310 and the third outlet hole 320, and the wires of each phase of the load terminal 120 can be connected from the second outlet hole 310 or the third outlet hole 320. Since the stepped surfaces of the load terminal 120, the grid terminal 110, and the motor terminal 130 are not in the same plane, the wires of each phase of the load terminal 120 will not interfere with the wires of each phase of the grid terminal 110 and the motor terminal 130. Among them, the two static transfer switches stacked up and down are connected through the side external terminal.

[0058] As shown in the figure, Figure 9As shown, when the two static transfer switches are placed side by side, the power grid connection end 110, the load connection end 120, and the motor connection end 130 of each phase of the two static transfer switches are connected from the first outlet hole 300 at the top of the static transfer switch. In addition, the top of the cabinet 200 of the static transfer switch is also provided with an opening, and the external connection terminal 170 of one static transfer switch is connected to the external connection terminal 170 of another static transfer switch through the top opening of the cabinet.

[0059] In use, the power grid needs to be powered first, rather than relying on the battery of the energy storage inverter. This is because the power grid may be under maintenance, and at this time, powering through the PCS will cause reverse current to the power grid, endangering the safety of maintenance personnel.

[0060] Further, the AC connection terminal is arranged on the side wall of the switch body. The AC connection terminal is used to connect the AC side of the power grid or the motor, and after connection, the STS or PCS is powered on, so that the address is obtained after the STS and the PCS are started, facilitating remote management.

[0061] In the embodiment, the power grid connection end 110, the load connection end 120, and the motor connection end 130 all adopt a multi-layer stepped structure, and each stepped surface is provided with one of the phase connection points of R, S, T, and N, thereby avoiding mutual interference between the thick wires of each phase connection point and making wiring more convenient. The power grid connection end 110, the load connection end 120, and the motor connection end 130 are arranged side by side and spaced apart on the same side of the switch body 100, which can effectively improve the efficiency of wiring. In addition, the height of the load connection end 120 is higher than the height of the power grid connection end 110 and the motor connection end 130 on both sides, which can effectively avoid the interference of the wire harness of the load connection end 120 by the wire harness of the power grid connection end 110 and the motor connection end 130 on both sides. In addition, the switch body 100 has an external connection terminal 170 on one side or both sides, and multiple static transfer switches can be conveniently connected through the external connection terminal 170 on the side wall, whether stacked or placed side by side.

[0062] Embodiment 2

[0063] The embodiment discloses an energy storage system, which comprises an energy storage converter connected with a battery, and the static transfer switch in the embodiment 1, and the static transfer switch is electrically connected with at least one energy storage converter.

[0064] Specifically, the number of the static transfer switches is at least two, different static transfer switches are connected in parallel with each other, and each static transfer switch is electrically connected with at least one energy storage converter, and one static transfer switch can call the energy storage converter electrically connected with other static transfer switches.

[0065] For example, a 500KW STS can be connected with at most five 100KW or 125KW PCSs (STS can be overloaded for a short time), so that the power can be increased or decreased by increasing or decreasing the number of PCSs.

[0066] In addition, the energy among the multiple STSs connected in parallel can be mutually scheduled, for example, STS numbered A is connected with five PCSs and is connected with a load, STS numbered B is connected with five PCSs, if the batteries of the five PCSs connected with STS numbered A are used up, STS numbered A can schedule the batteries of the five PCSs connected with STS numbered B. Thus, theoretically, the expansion of more than 500KW can be realized.

[0067] The energy storage system in the embodiment adopts the static transfer switch in embodiment 1, and the parallel connection among multiple static transfer switches can be realized, multiple energy storage converters are connected with different static transfer switches, and multiple batteries are connected with the energy storage converters, the static transfer switch connected with the load can use the batteries on the energy storage converters of other static transfer switches connected in parallel in addition to the batteries on the energy storage converters connected with itself, so that the expansion of the static transfer switch is easily realized.

[0068] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the utility model, and the utility model is not limited to this. For ordinary skilled persons in the art, various modifications and improvements can be made without departing from the spirit and essence of the utility model, and these modifications and improvements are also regarded as the protection scope of the utility model.

Claims

1. A static changeover switch, characterized in that, The device includes a switch body (100), a power grid terminal (110) electrically connected to the switch body (100), and a load terminal (120). Both the power grid terminal (110) and the load terminal (120) include phase connection points for three-phase power lines and a neutral line. At least one phase connection point of the power grid terminal (110) and / or the load terminal (120) is located in a different plane from the other phase connection points. The switch body (100) is electrically connected to the battery through the energy storage converter, the grid terminal (110) is electrically connected to the power grid, and the load terminal (120) is electrically connected to the electrical equipment.

2. The static changeover switch according to claim 1, characterized in that, Both the grid terminal (110) and the load terminal (120) have a stepped structure, and the four phase connection points R, S, T and N of the grid terminal (110) and the load terminal (120) are located in different horizontal planes.

3. The static changeover switch according to claim 1 or 2, characterized in that, It also includes a motor terminal (130) electrically connected to the switch body (100). The motor terminal (130) is stepped. The four phase connection points of the motor terminal (130) R, S, T and N are located in different horizontal planes. The motor terminal (130) is electrically connected to the generator.

4. The static changeover switch according to claim 3, characterized in that, The power grid terminal (110), the load terminal (120), and the motor terminal (130) are arranged side by side at intervals on the same surface of the switch body (100).

5. The static changeover switch according to claim 4, characterized in that, The height of the protrusion in the middle of the load terminal (120), the power grid terminal (110), and the motor terminal (130) is higher than the height of the protrusions on both sides.

6. The static changeover switch according to claim 1 or 2, characterized in that, It also includes a cabinet (200), and the switch body (100) is installed inside the cabinet (200).

7. The static changeover switch according to claim 6, characterized in that, The cabinet (200) has a first connecting part (210) at its first end on the outer surface, and a second connecting part (220) at its second end on the outer surface opposite to the first end. When two static transfer switches are connected, the first connection part (210) on the cabinet (200) of one static transfer switch is connected to the second connection part (220) on the cabinet (200) of the other static transfer switch.

8. The static changeover switch according to claim 7, characterized in that, The first connecting part (210) consists of multiple protrusions on the top of the cabinet (200), and the second connecting part (220) consists of multiple grooves on the bottom of the cabinet (200). When the two static changeover switches are connected, the four protrusions on the top of the lower static changeover switch are respectively inserted into the four grooves on the bottom of the upper static changeover switch.

9. The static changeover switch according to claim 6, characterized in that, The top of the cabinet (200) is provided with a first cable outlet (300), and the two sides of the cabinet (200) are respectively provided with a second cable outlet (310) and a third cable outlet (320).

10. The static changeover switch according to claim 1, characterized in that, The outer surface of the switch body (100) is provided with a first hand grip (140), which is a groove provided on both sides of the switch body (100).

11. The static changeover switch according to claim 10, characterized in that, The outer surface of the switch body (100) is also provided with a second hand grip (150). There are two sets of the second hand grip (150), and the two sets of the second hand grip (150) are symmetrically arranged about the central axis of the switch body (100). Each set of second hand-held parts (150) includes an L-shaped plate (151) and a handle (152). One side of the L-shaped plate (151) is fixed to the side wall of the switch body (100), and the other side is perpendicular to the side wall of the switch body (100). The handle (152) is fixedly installed on the side of the L-shaped plate (151) that is perpendicular to the side wall of the switch body (100).

12. The static changeover switch according to claim 1, characterized in that, It also includes a contactor (160), which is disposed on the circuit between the switch body (100) and the energy storage converter. The switch body (100) is also provided with an AC terminal block on its side wall.

13. The static changeover switch according to claim 1, characterized in that, The switch body (100) also has external wiring terminals (170) on one or both sides, which are used for electrical connection of multiple stacked or side-by-side static changeover switches.

14. An energy storage system, comprising an energy storage converter connected to a battery, characterized in that, It also includes a static transfer switch as described in any one of claims 1-13, the static transfer switch being electrically connected to at least one energy storage converter.

15. The energy storage system according to claim 14, characterized in that, The number of static transfer switches is at least two, and the different static transfer switches are connected in parallel with each other. Each static transfer switch is electrically connected to at least one energy storage converter. One static transfer switch can call up an energy storage converter that is electrically connected to other static transfer switches.

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