High-voltage connecting device for energy storage, boosting and inversion integrated cabin

Abstract

The utility model discloses a high-voltage connecting device for an energy storage, boosting and inversion integrated cabin, which is connected between a high-voltage bus of the energy storage, boosting and inversion integrated cabin and a current collection wire side cable inlet wire, and comprises a circuit breaker, an isolating switch and a grounding switch, the second end of the breaker is connected with the first end of the isolation switch, the second end of the isolation switch is connected with the current collection wire side cable inlet wire, the first end of the grounding switch is grounded, and the second end of the grounding switch is connected with the main transformer. According to the utility model, through the reasonable configuration of the grounding switch and the isolation switch, the safety of the system is greatly improved: the grounding switch at the side of the current collection wire is cancelled, so that the misoperation of the grounding switch by an operator under an improper condition is avoided; the grounding switch is arranged on the transformer side, so that an operator can switch on the grounding switch through switching operation when the system needs to be overhauled; and the added isolating switch ensures that the system can be thoroughly isolated after power failure.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrochemical energy storage technical field especially relates to a high voltage connecting device for energy storage step-up inverter integrated cabin. BACKGROUND

[0002] In the electrochemical energy storage power station, the energy storage step-up inverter integrated cabin is part of the electrochemical energy storage system, which connects the 10kV or 35kV power system with the electrochemical cells in the electrochemical energy storage unit and controls the charging and discharging of the electrochemical cells. The energy storage step-up inverter integrated cabin includes a high-voltage chamber, a power transformer, an energy storage converter, and an auxiliary power distribution part of the energy storage step-up integrated cabin. According to the requirements of Article 5.1.3 of GB / T40090-2021, the operating conditions of the energy storage system of the energy storage power station can be divided into start-up, charging, discharging, shutdown, hot standby, etc. The high-voltage chamber of the energy storage step-up inverter integrated cabin is designed with a high-voltage cabinet to control the start-up, shutdown, hot standby, and other operating conditions of the energy storage system.

[0003] In the existing high-voltage side grid connection design of the energy storage step-up inverter integrated cabin, the collection line side cables of the electrochemical energy storage system are all in the downfeed mode, and the 10kV or 35kV high-voltage cabinets at this stage are also in the downfeed mode. By controlling the opening and closing of the circuit breaker of the high-voltage cabinet of the energy storage step-up inverter integrated cabin, the start-up, shutdown, hot standby, and other operating conditions of the energy storage system can be realized. There is a grounding switch at the downfeed position of the high-voltage cabinet, and this grounding switch only provides electrical five-protection for the disconnecting switch and circuit breaker in the high-voltage cabinet, but does not provide electrical five-protection for the collection line side of the 10kV or 35kV power system, which may cause misoperation of the high-voltage switch with the grounding switch miscombined. In addition, when the transformer is running and maintaining or being overhauled, there is no visible grounding design for the high-voltage side of the transformer. During the operation and maintenance of the energy storage system, power outage operation or grounding wire hanging operation is required for the collection line side, which complicates the operation and maintenance.

[0004] Therefore, a new solution is needed. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a high-voltage connecting device for an energy storage step-up inverter integrated cabin to improve the safety and convenience of the operation and maintenance of the energy storage step-up inverter integrated cabin.

[0006] In order to achieve the above object, the utility model provides a high voltage connecting device for energy storage voltage boosting inversion integrated cabin is connected between the high voltage bus and the cable incoming line of the cable side of the energy storage voltage boosting inversion integrated cabin, including circuit breaker, disconnecting switch and earthing switch, the first end of circuit breaker is connected main transformer, the second end of circuit breaker is connected the first end of disconnecting switch, the second end of disconnecting switch is connected the cable incoming line of the cable side, the first end of earthing switch is grounded, the second end of earthing switch is connected main transformer.

[0007] In the high voltage connecting device for energy storage voltage boosting inversion integrated cabin provided by the utility model, the second end of the earthing switch is also connected to the second live display via a second capacitor.

[0008] In the high voltage connecting device for energy storage voltage boosting inversion integrated cabin provided by the utility model, a first locking device is connected to the disconnecting switch and the earthing switch.

[0009] In the high voltage connecting device for energy storage voltage boosting inversion integrated cabin provided by the utility model, a second locking device is connected to the circuit breaker and the disconnecting switch.

[0010] The high voltage connecting device for energy storage voltage boosting inversion integrated cabin provided by the utility model has the following beneficial effects: the utility model greatly improves the safety of the system by reasonably configuring the earthing switch and the disconnecting switch; the earthing switch on the cable side is cancelled, so that the operator cannot misoperate the earthing switch in inappropriate conditions, thereby reducing the electrical faults and safety accidents caused by misoperation; by setting the earthing switch on the transformer side, when the system needs to be overhauled, the operator can turn on the earthing switch through switching operation, so that the electrical system can be safely isolated from the power grid, and the overhaul work can be carried out in a safe condition; the added disconnecting switch ensures that the system can be completely isolated after power failure, and the operator can safely maintain the equipment without worrying about sudden power-on. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only the embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor according to the provided drawings:

[0012] Figure 1 The principle diagram of the high voltage connecting device for energy storage voltage boosting inversion integrated cabin provided by an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0013] For the convenience of understanding the utility model, the utility model will be described more fully below with reference to the relevant drawings. The drawings show typical embodiments of the utility model. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0015] Figure 1 As shown is the principle schematic view of the high-voltage connecting device for the energy storage and voltage boosting and inverter integrated cabin provided by an embodiment of the utility model. As Figure 1 As shown, the high-voltage connecting device for the energy storage and voltage boosting and inverter integrated cabin provided by the utility model is connected between the high-voltage bus and the cable incoming line of the power collection line of the energy storage and voltage boosting and inverter integrated cabin, comprising a circuit breaker 100, a disconnector 200 and a grounding switch 300. Among them, the first end of the circuit breaker 100 is connected with the main transformer 400, and the second end of the circuit breaker 100 is connected with the first end of the disconnector 200. The circuit breaker connected between the main transformer and the disconnector can automatically disconnect the circuit when the current exceeds the safety limit, thereby preventing the occurrence of equipment damage or fire accidents. The second end of the disconnector 200 is connected with the cable incoming line of the power collection line. The disconnector is mainly used to ensure that the circuit is completely disconnected during equipment maintenance, preventing the operator from being injured due to current flow during maintenance. By connecting the disconnector between the circuit breaker and the cable incoming line of the power collection line, the disconnector can completely isolate the entire device from the power system after the circuit breaker is disconnected, while ensuring that the current from the transformer to the power collection line is completely disconnected, ensuring the safety of subsequent operations. The first end of the grounding switch 300 is grounded, and the second end of the grounding switch 300 is connected with the main transformer 400. The main function of the grounding switch is to connect the device to the ground through the grounding line when the device fails, avoiding injury to the operator due to the live device. By connecting the grounding switch to the main transformer, the grounding operation of the grounding switch can be used to ground the main transformer when needed, thereby ensuring that the transformer will not be shocked during maintenance due to live wires.

[0016] In the traditional design, a high-voltage cabinet is usually installed between the high-voltage bus and the device, which occupies a large amount of space and increases the complexity and cost of the device. In the present design, by canceling the configuration of the high-voltage cabinet, the grounding switch and the disconnector are directly arranged on the transformer side and the power collection line side, thereby simplifying the arrangement of the device and reducing the maintenance difficulty.

[0017] In the traditional design, the grounding switch is usually arranged at the side of the power collection line, so that if the grounding switch is misoperated, the circuit breaker at the side of the power collection line may be closed, thereby causing an electrical fault or a safety accident. In the design, the grounding switch is arranged at the side of the main transformer, so that when the operator is overhauling or maintaining, the operator only needs to operate the grounding switch, and does not need to worry about the risk caused by misoperation. In addition, the arrangement of the grounding switch at the side of the main transformer ensures that when the energy storage and voltage boosting inverter integrated bin needs to be maintained, the entire electrical system can be safely grounded and powered off, thereby ensuring the safety of the equipment.

[0018] In the embodiment, the disconnector is arranged between the power collection line and the circuit breaker. The disconnector functions to ensure that even in the case of system power-off, safe isolation can still be provided, and unsafe factors caused by misoperation of the equipment are avoided. The arrangement of the disconnector enables the system to provide more reliable safety protection after shutdown, and avoids the safety hazards such as electric shock of the operator caused by the live equipment.

[0019] The grounding switch and the disconnector are reasonably arranged in the utility model, so that the safety of the system is greatly improved. The grounding switch at the side of the power collection line is cancelled, so that misoperation of the grounding switch by the operator in inappropriate conditions is avoided, thereby reducing electrical faults and safety accidents caused by misoperation. The grounding switch is arranged at the side of the transformer, so that when the system needs to be overhauled, the operator can close the grounding switch through switching operation, so that the electrical system is safely isolated from the power grid, and the overhauling work can be carried out in a safe condition. The arrangement of the disconnector ensures that the system can be completely isolated after power-off, and the operator can safely carry out equipment maintenance without worrying about sudden power-on.

[0020] Further, in the embodiment of the utility model, the second end of the disconnector 200 is further connected to the high-voltage lightning arrester 500 and connected to the first live display 700 through the first capacitor 600; the second end of the grounding switch 300 is further connected to the second live display 900 through the second capacitor 800. When the electrochemical energy storage system is started, the grounding switch is opened, the disconnector is closed, and the circuit breaker is closed in sequence to realize power supply at the high-voltage side; when the electrochemical energy storage system is stopped, the circuit breaker is opened, the disconnector is opened, and the grounding switch is closed in sequence to realize power-off at the high-voltage side; when the electrochemical energy storage system is in hot standby, the grounding switch is opened, and the disconnector is closed in sequence to realize switching at the high-voltage side.

[0021] Further, in an embodiment of the utility model, still include first locking device (not shown in drawing) connected to the isolator 200 and the grounding switch 300 and second locking device (not show in drawing) connected to the circuit breaker 100 and the isolator 200. First locking device is connected between isolator 200 and grounding switch 300, and the main role is to prevent the closing operation of grounding switch 300 when isolator 200 is in the closing position. When the isolator is closed, the first locking device locks the grounding switch 300 by physical or electronic means, preventing it from being misoperated. This is to prevent the grounding switch from being closed when the circuit is not completely disconnected, thereby preventing the grounding action of live equipment and reducing the risk of electric shock. Only when the isolator 200 is in the open position, the first locking device will release the control of the grounding switch, allowing the operator to perform the closing operation of the grounding switch. The second locking device is connected between the circuit breaker and the isolator, and the purpose is to control the isolator 200 from closing when the circuit breaker 100 is in the open position. When the circuit breaker 100 is in the open state, the second locking device will prevent the isolator 200 from closing. At this time, the operator cannot close the isolator because the circuit breaker is already in the open state and the circuit cannot be completely closed. This ensures that the equipment is in a safe open state and prevents the risk of misfeeding. Only when the circuit breaker 100 is closed and the circuit is closed, the second locking device will release the control of the isolator 200, allowing the isolator to close. Thus, through the control of the first locking device and the second locking device, the high-voltage connection device for the energy storage and voltage boosting integrated cabin of the utility model meets the electrical five-prevention requirements, i.e. when the isolator is in the closing position, the first locking device controls the grounding switch from closing, and when the circuit breaker is in the open position, the second locking device controls the isolator from closing. The locking device can be automatically operated through mechanical locking, electronic control, etc. This not only improves the accuracy of operation, but also reduces the possibility of human error.

[0022] The introduction of the first locking device and the second locking device makes the high-voltage connection device of the utility model more in line with the electrical "five-prevention" requirements, ensuring the safety of the energy storage and voltage boosting integrated cabin during high-voltage operation. The locking device prevents misoperation, mis-closing, and mis-grounding, effectively preventing electrical accidents and ensuring the safety of operators and stable operation of equipment.

[0023] The high-voltage connection device for the energy storage and voltage boosting integrated cabin of the utility model has the following advantages:

[0024] 1. The high-voltage cabinet configuration on the high-voltage side of the energy storage and voltage boosting integrated cabin is cancelled, the grounding switch is placed on the transformer side, and the isolator is placed on the power collection line side.

[0025] 2. Add disconnector between the collector line side and the circuit breaker, retain the safe isolation function after the energy storage voltage boosting inverter integrated bin is powered off;

[0026] 3. Cancel the grounding switch between the collector line side and the circuit breaker, avoid the safety accident caused by the misoperation of closing the circuit breaker at the collector line side when the grounding switch is in the closed position;

[0027] 4. By adding a grounding switch on the transformer side, only the grounding switch is correctly switched on by the correct switching operation when the energy storage voltage boosting inverter integrated bin is running, maintained and repaired, and the running, maintenance and repair work can be carried out;

[0028] 5. Through the control of the first and second locking devices, the system can strictly follow the electrical "five prevention" requirements (prevention of misoperation, prevention of misoperation, prevention of misoperation, prevention of misoperation, and prevention of misoperation), thereby significantly improving the safety and reliability of the system.

[0029] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present specification.

[0030] Similarly, it should be appreciated that the individual features of the application have sometimes been presented in the description of the exemplary embodiments of the application above together with some embodiments of the application in a causal relationship, in order to simplify the present disclosure and to facilitate the understanding of one or more of the individual inventive aspects. However, the method of the disclosure should not be interpreted as reflecting an intention to reflect more features than the features explicitly recited in each claim. Rather, as reflected in the claims below, the inventive aspects are in less than all the features of the single embodiments disclosed above. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, wherein each claim itself is a separate embodiment of the application.

[0031] In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the following claims, any one of the claimed embodiments can be used in any combination.

[0032] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and alternative embodiments can be designed by those skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs located between parentheses shall not be construed as limiting the claims. The word comprising does not exclude the presence of elements or steps not listed in the claims. The word a or an preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and the present application can be implemented by means of a suitably programmed computer. In a unit claim enumerating several means, the several means can be embodied by one and the same item of hardware. The use of the words first, second and third, etc. do not imply any order. These words can be understood as names.

Claims

1. A high-voltage connecting device for an energy storage and voltage boosting inverter integrated cabin, connected between a high-voltage bus of the energy storage and voltage boosting inverter integrated cabin and a cable inlet of a current collection line side, characterized in that, The circuit breaker (100), the disconnector (200) and the grounding switch (300) are included, the first end of the circuit breaker (100) is connected with the main transformer (400), the second end of the circuit breaker (100) is connected with the first end of the disconnector (200), the second end of the disconnector (200) is connected with the cable incoming line of the power collection line side, the first end of the grounding switch (300) is grounded, and the second end of the grounding switch (300) is connected with the main transformer (400).

2. The high-voltage connection device for the energy storage and boost inverter integrated cabin according to claim 1, characterized in that, The second end of the disconnector (200) is also connected with the high-voltage arrester (500) and connected to the first live display (700) through the first capacitor (600).

3. The high voltage connection device for the energy storage and boost inverter integrated pod of claim 1, wherein, The second end of the grounding switch (300) is also connected to the second live display (900) through the second capacitor (800).

4. The high voltage connection device for the energy storage and boost inverter integrated pod of claim 1, wherein, The first locking device connected with the disconnector (200) and the grounding switch (300) is also included.

5. The high voltage connection device for the energy storage and boost inverter integrated pod of claim 1, wherein, The second locking device connected with the circuit breaker (100) and the disconnector (200) is also included.

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