A box-type substation, energy storage power supply system and photovoltaic power generation system

Abstract

The application discloses a box-type transformer substation, an energy storage power supply system and a photovoltaic power generation system. The box-type transformer substation comprises a low-voltage cabinet, a high-voltage cabinet, a transformer, a first key string and a second key string. When two circuit breakers in the low-voltage cabinet are in a closed state, the first key string and the second key string are locked on a corresponding circuit breaker respectively. When the transformer is maintained, the circuit breakers in the low-voltage cabinet are first opened to remove the first key string and the second key string. Then, the first key string and the second key string are used to open the disconnectors in the high-voltage cabinet at the same time, and the first key string and the second key string are locked on the disconnectors when the disconnectors are in an open state. The mechanical lock logic of the box-type transformer substation is simple, and maintenance personnel can quickly complete the opening process of the circuit breakers and the disconnectors. The safety of the maintenance personnel can be ensured, and the maintenance efficiency of the transformer can be improved, so that the operation reliability of the energy storage system and the photovoltaic power generation system using the box-type transformer substation can be improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a prefabricated substation, an energy storage power supply system, and a photovoltaic power generation system. Background Technology

[0002] Due to its advantages such as small footprint, high mobility, safety and reliability, and convenient maintenance, the prefabricated substation has been widely used in various energy storage scenarios.

[0003] Currently, to ensure safe maintenance of transformers in prefabricated substations, a logic lock is typically installed. This lock requires that the transformer room door be opened only after the circuit breaker in the low-voltage switchgear has been tripped and the circuit breaker tripping, isolating switch tripping, and grounding switch closing operations have been completed in the high-voltage switchgear. This ensures that maintenance personnel can only enter the transformer room to perform maintenance when the windings in both the low-voltage and high-voltage switchgear are de-energized, effectively guaranteeing their safety. However, the interlocking logic of the current prefabricated substation logic locks is quite complex, requiring maintenance personnel to be thoroughly familiar with the operation manual to operate them, which is not conducive to rapid transformer maintenance in emergency situations. Therefore, simplifying the interlocking design, reducing material usage, and saving time spent on disengaging interlocks while ensuring safety, thereby effectively improving the overall efficiency of transformer maintenance in prefabricated substations, has become a pressing problem for those skilled in the art. Summary of the Invention

[0004] This application provides a prefabricated substation, an energy storage power supply system, and a photovoltaic power generation system, which simplifies the interlocking design while ensuring the maintenance safety of the prefabricated substation, thereby improving the maintenance efficiency of the transformers in the prefabricated substation and enhancing the operational reliability of the energy storage power supply system and photovoltaic power generation system using the prefabricated substation.

[0005] In a first aspect, this application provides a prefabricated substation, which may include a low-voltage switchgear, a high-voltage switchgear, a transformer, a first key chain, and a second key chain. The low-voltage switchgear includes a first circuit breaker and a second circuit breaker. The first circuit breaker controls the connection or disconnection between the low-voltage input terminal of the prefabricated substation and one low-voltage winding of the transformer; the second circuit breaker controls the connection or disconnection between the low-voltage input terminal of the prefabricated substation and the other low-voltage winding of the transformer. The first key chain is used to close or open the first circuit breaker, and when the first circuit breaker is closed, the first key chain is locked at the first circuit breaker, preventing it from being removed. The second key chain is used to close or open the second circuit breaker, and when the second circuit breaker is closed, the second key chain is locked at the second circuit breaker, preventing it from being removed. Additionally, the high-voltage switchgear includes a disconnecting switch, which controls the connection or disconnection between the high-voltage winding of the transformer and the output terminal of the prefabricated substation. When both the first circuit breaker and the second circuit breaker are tripped, the first key chain and the second key chain are used to simultaneously trip the disconnecting switch and are both locked at the disconnecting switch. The mechanical lock interlocking structure of the prefabricated substation provided in this application is relatively simple in design. Based on the mechanical lock logic of the prefabricated substation provided in this application, maintenance personnel can quickly trip the first circuit breaker, the second circuit breaker, and the disconnecting switch without using an operation manual. This is beneficial to improving the maintenance efficiency of the transformer in the prefabricated substation, thereby saving maintenance costs. In addition, since the first key chain and the second key chain are used to simultaneously trip the disconnecting switch and are both locked at the disconnecting switch when both the first circuit breaker and the second circuit breaker are tripped, the accidental closing operation can be effectively avoided after the tripping of the first circuit breaker, the second circuit breaker, and the disconnecting switch, thus ensuring the safety of maintenance personnel.

[0006] In one possible implementation of this application, the prefabricated substation further includes a first grid door, a second grid door, a third key chain, and a fourth key chain. The high-voltage switchgear also includes a grounding switch; when the disconnecting switch is closed, the grounding switch is open; when the disconnecting switch is open, the grounding switch is closed. Furthermore, when the grounding switch is closed, the third key chain is used to open the first grid door, and the fourth key chain is used to open the second grid door. When the first grid door is open, the third key chain is locked at the first grid door. And when the second grid door is open, the fourth key chain is locked at the second grid door. Thus, opening the first and second grid doors when the first and second circuit breakers in the low-voltage switchgear are open, the disconnecting switch in the high-voltage switchgear is open, and the grounding switch is closed effectively improves the safety of maintenance of the prefabricated substation. Furthermore, since the third key chain is locked at the first key chain and the fourth key chain is locked at the second key chain when the first and second key chains are in the open state, the grounding switch can be prevented from being accidentally tripped during transformer maintenance, thereby effectively improving the safety of transformer maintenance.

[0007] In one possible implementation of this application, the first key string may include a first key, and the second key string may include a second key. The first circuit breaker includes a first lock, and when the first circuit breaker is closed, the first key is locked in the first lock. Therefore, when the first circuit breaker is closed, the first key string cannot be separated from the first circuit breaker, thus preventing the first key string from being used to trip the disconnecting switch. This allows for a limitation on the order in which the first circuit breaker and the disconnecting switch are tripped, which improves the operational safety of the unlocking process of the prefabricated substation.

[0008] Similarly, the second circuit breaker may include a second lock, in which the second key is locked when the second circuit breaker is closed. This prevents the second key chain from being separated from the second circuit breaker when it is closed, thus preventing the second key chain from being used to trip the disconnecting switch. Therefore, the order in which the second circuit breaker and the disconnecting switch are tripped can be limited, which improves the operational safety of the unlocking process of the prefabricated substation.

[0009] In one possible implementation of this application, the disconnecting switch includes a third lock and a fourth lock. When the disconnecting switch is open, the first key is locked in the third lock. And when the disconnecting switch is open, the second key is locked in the fourth lock. In this implementation, the first key chain may contain only one first key, and the second key chain may contain only one second key. This ensures that the disconnecting switch can only be opened after both the first and second circuit breakers are locked in the open state, effectively improving the operational security of the unlocking process of the prefabricated substation. Furthermore, when opening the disconnecting switch using the first and second key chains, the time spent distinguishing and confirming matching locks and keys is saved, effectively improving the unlocking efficiency of the prefabricated substation.

[0010] In one possible implementation of this application, the disconnecting switch includes a third lock and a fourth lock, the first key chain further includes a third key, and the second key chain further includes a fourth key. When the disconnecting switch is open, the third key is locked to the third lock. Additionally, when the disconnecting switch is open, the fourth key is locked to the fourth lock. This allows the disconnecting switch to be opened and locked in the open state simultaneously using the third and fourth keys, even when both the first and second circuit breakers are locked in the open state, thereby improving the maintenance safety of the prefabricated substation.

[0011] In one possible implementation of this application, the third lock and the fourth lock are of the same type, and the third key and the fourth key are of the same type. This saves time in distinguishing and confirming the third and fourth keys when using the first key string and the second key string to disconnect the disconnecting switch, thereby enabling rapid connection between the first and second key strings and the disconnecting switch, effectively improving the unlocking efficiency of the prefabricated substation.

[0012] In one possible implementation of this application, the first lock and the second lock are of the same type, and the first key and the second key are of the same type. In this case, the first circuit breaker and the second circuit breaker can be of the same type, which is beneficial to simplifying the structure of the prefabricated substation.

[0013] In one possible implementation of this application, the third key chain includes the fifth key, and the fourth key chain includes the sixth key. The grounding switch includes the fifth lock and the sixth lock. When the grounding switch is tripped, the fifth key is locked to the fifth lock, and the sixth key is locked to the sixth lock, thereby connecting the third key chain and the fourth key chain to the grounding switch.

[0014] In one possible implementation of this application, the first network door includes a seventh lock, and the second network door includes an eighth lock. When the grounding switch is closed, the fifth key is used to open the first network door, and the sixth key is used to open the second network door. Furthermore, when the first network door is open, the fifth key is locked to the seventh lock; when the second network door is open, the sixth key is locked to the eighth lock. In this implementation, the third key chain may only have one fifth key, and the fourth key chain may only have one sixth key. This ensures that the first and second network doors can only be opened when the grounding switch is closed, effectively improving the operational safety of the unlocking process of the prefabricated substation. Additionally, using the fifth key to open the first network door and the sixth key to open the second network door saves time in distinguishing and confirming matching locks and keys, effectively improving the unlocking efficiency of the prefabricated substation.

[0015] In one possible implementation of this application, the first network door includes a seventh lock, the second network door includes an eighth lock, the third key chain also includes a seventh key, and the fourth key chain also includes an eighth key. When the grounding switch is closed, the seventh key is used to open the first network door, and the eighth key is used to open the second network door. Thus, after the third and fourth key chains are removed from the grounding switch, they can be used to open the first and second network doors respectively, thereby enabling maintenance of the prefabricated substation.

[0016] In one possible implementation of this application, the seventh lock and the eighth lock are of the same type, and the seventh key and the eighth key are of the same type. This way, when using the third key chain and the fourth key chain to open the first mesh door and the second mesh door respectively, the time spent distinguishing and confirming the seventh key and the eighth key can be saved, thereby enabling rapid opening of the first mesh door and the second mesh door.

[0017] In one possible implementation of this application, the fifth lock and the sixth lock are of the same type, and the fifth key and the sixth key are of the same type. That is, the grounding switch can be equipped with two similar locks, which is beneficial for simplifying the structure of the prefabricated substation.

[0018] In one possible implementation of this application, during the process of relocking the prefabricated substation after maintenance, the grounding switch can only be opened when the fifth key is locked at the fifth lock and the sixth key is locked at the sixth lock. This ensures that both grid doors of the transformer room are closed when the grounding switch is opened, thereby improving the operational safety of the prefabricated substation locking process.

[0019] Secondly, this application also provides an energy storage power supply system. The energy storage power supply system includes an energy storage device, an energy storage converter, and the prefabricated substation described in the first aspect. The energy storage converter converts the direct current (DC) output from the energy storage device into alternating current (AC) for output to the prefabricated substation, or converts the AC input from the prefabricated substation into DC for input to the energy storage device. The prefabricated substation steps up the AC output from the energy storage converter before outputting it to the power grid, or steps down the AC input from the power grid before inputting it to the energy storage converter. Since the prefabricated substation provided in the first aspect of this application can effectively improve the maintenance efficiency of the prefabricated substation while ensuring the safety of maintenance personnel, it is beneficial to improve the operational reliability of the energy storage system using the prefabricated substation.

[0020] Thirdly, this application also provides a photovoltaic power generation system, which includes an inverter and the prefabricated substation described in the first aspect. The inverter converts received direct current (DC) into alternating current (AC) and outputs it to the prefabricated substation. The prefabricated substation then boosts the AC output from the inverter before outputting it to the power grid. Since the prefabricated substation provided in the first aspect of this application can effectively improve the maintenance efficiency of the prefabricated substation while ensuring the safety of maintenance personnel, it is beneficial to improving the operational reliability of the photovoltaic power generation system using the prefabricated substation. Attached Figure Description

[0021] Figure 1 A structural block diagram of an energy storage power supply system provided in an embodiment of this application;

[0022] Figure 2 A structural block diagram of a photovoltaic power generation system provided in an embodiment of this application;

[0023] Figure 3 A schematic diagram illustrating a specific application scenario of the prefabricated substation provided in this application embodiment;

[0024] Figure 4 This is a schematic diagram of a prefabricated substation provided in an embodiment of this application;

[0025] Figure 5Another structural schematic diagram of the prefabricated substation provided in the embodiments of this application;

[0026] Figure 6 Another structural schematic diagram of the prefabricated substation provided in the embodiments of this application;

[0027] Figure 7 Another structural schematic diagram of the prefabricated substation provided in the embodiments of this application;

[0028] Figure 8 Another structural schematic diagram of the prefabricated substation provided in the embodiments of this application;

[0029] Figure 9 Another structural schematic diagram of the prefabricated substation provided in the embodiments of this application;

[0030] Figure 10 Another structural schematic diagram of the prefabricated substation provided in the embodiments of this application;

[0031] Figure 11 This is another structural schematic diagram of the prefabricated substation provided in the embodiments of this application.

[0032] Figure label:

[0033] 1-Low-voltage switchgear; 101-First circuit breaker; 1011-First trip switch; 102-Second circuit breaker; 1021-Second trip switch;

[0034] 2-First key chain; 3-Second key chain; 4-High voltage switchgear; 401-Disconnecting switch; 402-Grounding switch; 5-Third key chain;

[0035] 6-Fourth key chain; 7-Transformer room; 701-Cabinet; 7011-First mesh door; 7012-Second mesh door; 702-Transformer. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms expressing position and direction described in the embodiments of this application are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this application. The accompanying drawings of the embodiments of this application are only for illustrating relative positional relationships and do not represent actual scale.

[0037] It should be noted that specific details are set forth in the following description to facilitate understanding of this application. However, the embodiments of this application can be implemented in many ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the embodiments of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] To facilitate understanding of the prefabricated substation provided in this application embodiment, its application scenarios are first introduced below. The prefabricated substation provided in this application embodiment can be applied to energy storage power supply systems such as residential energy storage, industrial and commercial energy storage, or power plants. (Refer to...) Figure 1 , Figure 1 This is a structural block diagram of an energy storage power supply system provided in an embodiment of this application. The energy storage power supply system typically includes an energy storage converter and an energy storage device. The energy storage converter can be used to convert the direct current output from the energy storage device into alternating current (AC) for output to the prefabricated substation, or to convert the AC input from the prefabricated substation into direct current for input to the energy storage device. The prefabricated substation can be used to boost the AC output from the energy storage converter before outputting it to the power grid, or to step down the AC input from the power grid before inputting it to the energy storage converter.

[0039] In addition, the prefabricated substation provided in this application embodiment can also be used in photovoltaic power generation systems, as described above. Figure 2 , Figure 2 This is a structural block diagram of a photovoltaic power generation system provided in an embodiment of this application. The inverter of the photovoltaic power generation system can be used to convert the direct current received from the photovoltaic modules into alternating current and output it to the prefabricated substation. The prefabricated substation can be used to step up the alternating current output by the inverter and output it to the power grid, thereby realizing the grid connection of the photovoltaic power generation system.

[0040] Reference Figure 3 , Figure 3This is a schematic diagram illustrating a specific application scenario of the prefabricated substation provided in this application embodiment. The prefabricated substation includes a low-voltage switchgear 1, a high-voltage switchgear 4, and a transformer compartment 7. The transformer compartment 7 includes a transformer 702, which comprises two low-voltage windings and one high-voltage winding. The low-voltage switchgear 1 includes a first circuit breaker 101 and a second circuit breaker 102. One end of the first circuit breaker 101 is electrically connected to one of the low-voltage windings of the transformer 702, and the other end of the first circuit breaker 101 is connected to multiple molded case circuit breakers M1. One end of the second circuit breaker 102 is electrically connected to the other low-voltage winding of the transformer 702, and the other end of the second circuit breaker 102 is connected to multiple molded case circuit breakers M2. At least one molded case circuit breaker M1 connected to the first circuit breaker 101 can be used to electrically connect to an energy storage converter, and at least one molded case circuit breaker M2 connected to the second circuit breaker 102 can be used to electrically connect to an energy storage converter, thereby connecting the prefabricated substation to an energy storage power supply system. In addition, at least one molded case circuit breaker M1 connected to the first circuit breaker 101 can be used to electrically connect to the inverter, and at least one molded case circuit breaker M2 connected to the second circuit breaker 102 can be used to electrically connect to the inverter to connect the box-type substation to the photovoltaic power generation system.

[0041] Additionally, the high-voltage switchgear 4 includes a load switchgear G1, a circuit breaker cabinet G2, and a load switchgear G3. The circuit breaker cabinet G2 is electrically connected to the high-voltage winding of the transformer 702, and the load switchgear G1 is used to connect to the power grid, thereby connecting the prefabricated substation to the grid. When the energy storage power supply system or photovoltaic power generation system includes multiple prefabricated substations, the load switchgear G3 of the upper-level prefabricated substation is used to connect to the load switchgear G1 of the lower-level prefabricated substation, thereby connecting multiple prefabricated substations in series to the power grid.

[0042] The transformer is a crucial component of the prefabricated substation, enabling its functionality. When the transformer malfunctions, the transformer room door must be opened for maintenance. Currently, to ensure safe maintenance, prefabricated substations typically employ a logic-based mechanical lock system to guarantee the safety of maintenance personnel. Since a prefabricated substation generally includes a low-voltage switchgear, a high-voltage switchgear, and a transformer room, with the low-voltage switchgear comprising two circuit breakers, the high-voltage switchgear comprising a disconnecting switch and a grounding switch, and the transformer housed in the transformer room, it is understood that during transformer maintenance, to ensure the safety of maintenance personnel, the two circuit breakers and the disconnecting switch must first be tripped, and the grounding switch must be grounded.

[0043] The current logic-mechanical lock scheme used in the prefabricated substation typically involves setting up key transfer boxes in both the low-voltage and high-voltage switchgear. This allows for the removal of the keys on both circuit breakers after tripping the two circuit breakers in the low-voltage switchgear, locking both circuit breakers in the tripped position. Additionally, the keys on the two circuit breakers can unlock the disconnector key in the key transfer box of the low-voltage switchgear, allowing the disconnector key to be removed and used to unlock the disconnector switch in the high-voltage switchgear, thus enabling the tripping operation of the disconnector switch in the high-voltage switchgear. In this case, the disconnector key is inseparably connected to the disconnector switch. After completing the tripping of the circuit breakers and the disconnector switch, the grounding switch electrically connected to the transformer compartment can be closed, allowing the key at the grounding switch to be removed. This key can then be used to unlock the two network door keys in the key transfer box of the high-voltage switchgear. After removing the two gate keys, both gates can be unlocked, allowing maintenance personnel to enter the transformer room for inspection. This interlocking mechanism between the key transfer box and the mechanical lock on the transformer room ensures that maintenance personnel can only enter the transformer room for inspection when the windings in both the low-voltage and high-voltage switchgear are de-energized, effectively guaranteeing their safety.

[0044] As can be seen from the above description of the unlocking process of the prefabricated substation, the interlocking structure of the prefabricated substation is relatively complex, which makes the unlocking operation of the substation relatively complicated, and maintenance personnel need to be familiar with the operation manual to perform the operation. In case of an emergency, the unlocking operation takes a long time, which will greatly affect the maintenance efficiency of the transformer.

[0045] In view of this, this application provides a prefabricated substation that simplifies the interlocking structure design to improve maintenance efficiency while ensuring the safety of maintenance, thereby enhancing the operational reliability of energy storage systems and photovoltaic power generation systems using the prefabricated substation. The prefabricated substation provided in this application will be described in detail below with reference to the accompanying drawings.

[0046] Reference Figure 4 , Figure 4 This is a schematic diagram of a prefabricated substation provided in an embodiment of this application. In this embodiment, the prefabricated substation includes a low-voltage cabinet 1, a first key chain 2, and a second key chain 3. The low-voltage cabinet 1 includes a first circuit breaker 101 and a second circuit breaker 102. The first key chain 2 is used to close or open the first circuit breaker 101, and the second key chain 3 is used to close or open the second circuit breaker 102. Figure 4In the prefabricated substation shown, when the first circuit breaker 101 is in the closed state, the first key chain 2 is locked to the first circuit breaker 101, and therefore cannot be removed from the first circuit breaker 101. Similarly, when the second circuit breaker 102 is in the closed state, the second key chain 3 is locked to the second circuit breaker 102, and therefore cannot be removed from the second circuit breaker 102.

[0047] In this embodiment, the first circuit breaker 101 may include a first trip switch 1011 and a first lock L1. Therefore, the first circuit breaker 101 being in a closed state can be understood as the first trip switch 1011 being in a closed state. Additionally, the first key chain 2 may include a first key k1 and a third key k3. The first key k1 is matched with the first lock L1. Therefore, when the first trip switch 1011 is closed, the first key k1 is locked to the first lock L1.

[0048] The second circuit breaker 102 may include a second trip switch 1021 and a second lock L2. Therefore, the second circuit breaker 102 being in the closed state can be understood as the second trip switch 1021 being in the closed state. The second key chain 3 may include a second key k2 and a fourth key k4. When the second trip switch 1021 is closed, the second key k2 is locked at the second lock L2.

[0049] You can continue to refer to Figure 4 The prefabricated substation also includes a high-voltage cabinet 4, which includes a disconnecting switch 401. Figure 4 In the prefabricated substation shown, the disconnector switch 401 is in the closed state.

[0050] In the prefabricated substation provided in this application embodiment, when the first circuit breaker 101 and the second circuit breaker 102 are both tripped, the first key chain 2 and the second key chain 3 are used to simultaneously trip the disconnector switch 401 and are both locked at the disconnector switch 401. Specifically, the disconnector switch 401 includes a third lock L3 and a fourth lock L4. The third key k3 is matched with the third lock L3, meaning that when the first circuit breaker 101 and the second circuit breaker 102 are both tripped, the third key k3 can be used to connect with the third lock L3. Additionally, the fourth key k4 is matched with the fourth lock L4, so the fourth key k4 can be used to connect with the fourth lock L4. Therefore, when the third key k3 is connected to the third lock L3 and the fourth key k4 is connected to the fourth lock L4, the disconnector switch 401 can be tripped simultaneously using both the third key k3 and the fourth key k4. After the disconnector switch 401 trips, the third key k3 is locked at the third lock k3, and the fourth key k4 is locked at the fourth key k4.

[0051] The prefabricated substation may also include a third key chain 5 and a fourth key chain 6, and the high-voltage cabinet 4 may also include a grounding switch 402. The prefabricated substation is in... Figure 4When the state shown is such that the isolating switch 401 is in the closed state and the grounding switch 402 is in the open state, the third key chain 5 is locked to the grounding switch 402 and the fourth key chain 6 is locked to the grounding switch 402. Therefore, the third key chain 5 and the fourth key chain 6 cannot be removed from the grounding switch 402.

[0052] In this embodiment, the grounding switch 402 may include a fifth lock L5 and a sixth lock L6. Additionally, the third key chain 5 includes a fifth key k5 and a seventh key k7, and the fourth key chain 6 includes a sixth key k6 and an eighth key k8. The fifth key k5 matches the fifth lock L5, and the sixth key k6 matches the sixth lock L6. Furthermore, when the grounding switch 402 is in [position missing], [the following is unclear due to incomplete sentence or missing information]. Figure 4 When the circuit breaker is in the open state, the fifth key k5 is locked to the fifth lock L5 and the sixth key k6 is locked to the sixth lock L6. Therefore, when the grounding switch 402 is in the open state, the fifth key k5 and the sixth key k6 cannot be removed from the grounding switch 402, which means that the third key chain 5 and the fourth key chain 6 cannot be removed from the grounding switch 402.

[0053] It is worth mentioning that in the prefabricated substation provided in this application embodiment, the closing and opening of the disconnecting switch 401 and the grounding switch 402 can have an interlocking relationship. Specifically, when the disconnecting switch 401 is closed, the grounding switch 402 is opened; and when the disconnecting switch 401 is opened, the grounding switch 402 is closed. This simplifies the interlocking logic of the prefabricated substation, thereby improving the maintenance efficiency of the prefabricated substation.

[0054] Continue to refer to Figure 4 The prefabricated substation also includes a transformer room 7, which comprises a cabinet 701 and a transformer 702, with the transformer 702 housed within the cabinet 701. A first circuit breaker 101 is electrically connected to one low-voltage winding of the transformer 702 and controls the connection or disconnection between the low-voltage input terminal of the prefabricated substation and one low-voltage winding of the transformer 702. A second circuit breaker 102 is electrically connected to the other low-voltage winding of the transformer 702 and controls the connection or disconnection between the low-voltage input terminal of the prefabricated substation and the other low-voltage winding of the transformer 702. Additionally, a disconnecting switch 401 is electrically connected to the high-voltage winding of the transformer 702 and controls the connection or disconnection between the high-voltage winding of the transformer 702 and the high-voltage output terminal of the prefabricated substation.

[0055] The cabinet 701 of the transformer room 7 includes a first mesh door 7011 and a second mesh door 7012. Figure 4In the indicated state, both the first grid door 7011 and the second grid door 7012 of the transformer room 7 are closed. When the grounding switch 402 is closed, the aforementioned third key chain 5 can be used to open the first grid door 7011, and the fourth key chain 6 can be used to open the second grid door 7012. Furthermore, when the first grid door 7011 is open, the third key chain 5 is locked at the first grid door; when the second grid door 7012 is open, the fourth key chain 6 is locked at the second grid door 7012. Specifically, the first grid door 7011 includes a seventh lock L7, and the second grid door 7012 includes an eighth lock L8. This allows the seventh key k7 to be matched with the seventh lock L7, and the eighth key k8 to be matched with the eighth lock L8. Therefore, in this embodiment, when the grounding switch 402 is closed, the seventh key k7 can be connected to the seventh lock L7 and used to open the first grid door 7011, and when the first grid door 7011 is open, the seventh key k7 is locked to the seventh lock L7. In addition, when the grounding switch 402 is closed, the eighth key k8 can be used to connect with the eighth lock L8 and to open the second gate 7012. When the second gate 7012 is open, the eighth key k8 is locked to the eighth lock L8.

[0056] After understanding the structure of the prefabricated substation provided in the above embodiments of this application, the unlocking operation process of the prefabricated substation will be described next.

[0057] The first step is to trip the first circuit breaker 101 and the second circuit breaker 102. (Refer to...) Figure 4 When the first circuit breaker 101 trips, the first key k1 can be rotated and removed from the first lock L1, thereby separating the first key chain 2 from the first circuit breaker 101. Furthermore, when the first key chain 2 is separated from the first circuit breaker 101, the first circuit breaker 101 can also be locked in the tripped state. Similarly, when the second circuit breaker 102 trips, the second key k2 can be rotated and removed from the second lock L2, thereby separating the second key chain 3 from the second circuit breaker 102. Furthermore, when the second key chain 3 is separated from the second circuit breaker 102, the second circuit breaker 102 can also be locked in the tripped state.

[0058] After completing the first step, the prefabricated substation is in... Figure 5 The state shown Figure 5 This is another structural schematic diagram of the prefabricated substation provided in an embodiment of this application. (See attached diagram.) Figure 5As shown, after removing the first key chain 2 and the second key chain 3 from their respective circuit breakers, the second step can be performed: carrying the first key chain 2 and the second key chain 3 to the high-voltage cabinet 4 to unlock the disconnector switch 401. Specifically, the third key k3 can be inserted into the third lock L3 of the disconnector switch 401 and rotated, while the fourth key k4 is inserted into the fourth lock L4 of the disconnector switch 401 and rotated, thereby opening the disconnector switch 401. It is worth mentioning that in this embodiment, when the disconnector switch 401 is opened, the third key k3 is locked in the third lock L3, and the fourth key k4 is locked in the fourth lock L4, thereby locking the third key chain 5 and the fourth key chain 6 to the disconnector switch 401, which can effectively prevent the loss of the third key chain 5 and the fourth key chain 6.

[0059] It is worth mentioning that, in this embodiment of the application, the disconnecting switch 401 can only be opened when the third key k3 is inserted into the third lock L3 and the fourth key k4 is inserted into the fourth lock L4. This can effectively ensure that the disconnecting switch 401 can be opened only when both circuit breakers in the low-voltage cabinet 1 are in the open state, which can effectively improve the operational safety of the maintenance process of the box-type substation.

[0060] After completing the second step, the prefabricated substation is in... Figure 6 The state shown Figure 6 This is another structural schematic diagram of the prefabricated substation provided in an embodiment of this application. Figure 6 In the state shown, the third step can be performed. Specifically, the grounding switch 402 can be closed. When the isolating switch 401 is locked in the open state and the grounding switch 402 is in the closed state, the fifth key k5 can be rotated and pulled out of the fifth lock L5, and the sixth key k6 can be rotated and pulled out of the sixth lock L6, thereby separating the third key string 5 and the fourth key string 6 from the grounding switch 402.

[0061] After removing the third key chain 5 and the fourth key chain 6 from the grounding switch 402, the grounding switch 402 can be locked in the closed position. At this point, the third key chain 5 and the fourth key chain 6 can be taken to the transformer room 7 to proceed with the fourth step. For details, please refer to... Figure 7 , Figure 7 This is another structural schematic diagram of the prefabricated substation provided in an embodiment of this application. Because the prefabricated substation is located in... Figure 7When the state shown is such that the disconnecting switch 401 is locked in the open state and the grounding switch 402 is in the closed state, all windings in the low-voltage cabinet 1 and the high-voltage cabinet 4 are de-energized, and the transformer 702 in the transformer room 7 is not energized. At this time, the third key chain 5 can be used to open the first grid door 7011, and the fourth key chain 6 can be used to open the second grid door 7012. In specific implementation, the seventh lock L7 can be unlocked by the seventh key k7, and the eighth lock L8 can be unlocked by the eighth key k8, so that the first grid door 7011 and the second grid door 7012 of the transformer room 7 can be opened. Then, maintenance personnel can inspect the transformer 702 located in the cabinet 701 of the transformer room 7, which can effectively ensure the safety of maintenance personnel. Furthermore, since the third key chain 5 is locked at the first key chain 7011 when the first key chain 7011 is open, and the fourth key chain 6 is locked at the second key chain 7012 when the second key chain 7012 is open, this can prevent maintenance personnel from accidentally tripping the grounding switch 402 using the third key chain 5 and the fourth key chain 6 during the maintenance of the transformer 702, thereby improving the maintenance safety of the prefabricated substation.

[0062] It is worth mentioning that in the prefabricated substation provided in this application embodiment, there is no dependency between the opening of the first grid door 7011 and the opening of the second grid door 7012. Therefore, during the actual maintenance of the prefabricated substation, the first grid door 7011, the second grid door 7012, or both can be opened simultaneously, depending on the specific maintenance requirements.

[0063] Furthermore, in this application, the first mesh door 7011 can be configured as a single door or a double door. For example, when the first mesh door 7011 is configured as a single door, it can be equipped with only one seventh lock L7, which can then be opened with a single seventh key k7. When the first mesh door 7011 is configured as a double door, it can be understood that the first mesh door 7011 includes two doors, each of which can be equipped with a seventh lock L7. Therefore, to open the first mesh door 7011, both seventh locks L7 need to be unlocked separately. Additionally, when the first mesh door 7011 is configured as a double door, the lock types of the two doors can also be different. The key used to unlock these two doors can be connected to the fifth key k5 to form a third key chain 5.

[0064] Similarly, the second door 7012 can be configured as a single door or a double door. For example, when the second door 7012 is configured as a single door, it can be equipped with only one eighth lock L8, which can then be used to open the second door 7012. However, when the second door 7012 is configured as a double door, it can be understood as comprising two doors, each with its own eighth lock L8. Therefore, to open the second door 7012, both eighth locks L8 need to be unlocked. Furthermore, when the second door 7012 is configured as a double door, the lock types of the two doors can be different. The key used to unlock these two doors can then be connected to the sixth key k6 to form the fourth key chain 6.

[0065] Furthermore, after maintenance personnel complete the inspection of transformer 702, the prefabricated substation can be relocked following the reverse steps described above. It is worth noting that during the relocking process, the grounding switch 402 can only be opened when the fifth key k5 is locked in the fifth lock L5 and the sixth key k6 is locked in the sixth lock L6. This ensures that both gates of transformer compartment 7 are closed when the grounding switch 402 is opened, thereby improving the operational safety of the prefabricated substation's locking process.

[0066] In the prefabricated substation provided in this application embodiment, the mechanical lock logic between the low-voltage cabinet 1, the high-voltage cabinet 4, and the transformer room 7 is relatively simple. Maintenance personnel of the prefabricated substation, based on their understanding of the operational steps during transformer 702 maintenance—namely, first opening the circuit breaker in the low-voltage cabinet 1, then opening the isolating switch 401 in the high-voltage cabinet 4 and closing the grounding switch 402—can quickly unlock the transformer room 7's access door without using an operation manual. This ensures the safety of maintenance personnel while effectively improving the maintenance efficiency of the transformer 702, thereby reducing the maintenance cost of the prefabricated substation.

[0067] Based on the above description of the structure of the prefabricated substation and the unlocking and locking process, it can be understood that in this embodiment, the structure of the prefabricated substation can be further simplified by selecting the types of each lock and its corresponding key. For example, the first lock L1 and the second lock L2 can be of the same type, in which case the first key k1 and the second key k2 are of the same type, and the first circuit breaker 101 and the second circuit breaker 102 can be selected as circuit breakers of the same type. Furthermore, the third lock L3 and the fourth lock L4 can be of the same type, in which case the third key k3 and the fourth key k4 can be of the same type. Thus, when carrying the first key string 2 and the second key string 3 to the high-voltage cabinet 4 to unlock the isolating switch 401, it is not necessary to distinguish between the third key k3 and the fourth key k4, which reduces the time spent distinguishing and confirming the third key k3 and the fourth key k4.

[0068] Alternatively, the first lock L1 and the third lock L3 can be of the same type, in which case the first key k1 and the third key k3 are the same key, and the first key k1 and the third key k3 can be shared. Therefore, the first key string 2 can contain only one key. Similarly, the second lock L2 and the fourth lock L4 can also be of the same type, in which case the second key k2 and the fourth key k4 are the same key, and the second key string 3 can contain only one key. Thus, when the disconnector switch 401 in the high-voltage cabinet 4 is opened using the first key string 2 and the second key string 3, the first key k1 can be locked to the third lock L3, and the second key k2 can be locked to the fourth lock L4. This ensures that the disconnector switch 401 can only be opened after the first circuit breaker 101 and the second circuit breaker 102 are locked in the open state, effectively improving the operational safety of the unlocking process of the prefabricated substation. In addition, when using the first key chain 2 and the second key chain 3 to open the disconnect switch 401, the time for distinguishing and confirming the matching locks and keys can be saved, which can effectively improve the unlocking efficiency of the box-type substation.

[0069] In one possible embodiment of this application, the fifth lock L5 and the sixth lock L6 can be of the same type, and the fifth key k5 and the sixth key k6 can be of the same type. Additionally, the seventh lock L7 and the eighth lock L8 can be of the same type, and the seventh key k7 and the eighth key k8 can be of the same type. This way, when carrying the third key string 5 and the fourth key string 6 to the transformer room 7 to unlock the first mesh door 7011 and the second mesh door 7012, it is not necessary to distinguish between the seventh key k7 and the eighth key k8 to quickly open the first mesh door 7011 and the second mesh door 7012, thus reducing the time spent distinguishing and confirming the seventh key k7 and the eighth key k8.

[0070] Alternatively, the fifth lock L5 and the seventh lock L7 can be the same lock, then the fifth key k5 and the seventh key k7 are the same type of key. In this case, the fifth key k5 and the seventh key k7 can be shared, and the third key string 5 can contain only one key. Similarly, the sixth lock L6 and the eighth lock L8 are the same type of lock, then the sixth key k6 and the eighth key k8 are the same type of key, and the fourth key string 6 can contain only one key. In this way, when the disconnecting switch 401 is locked in the open state and the grounding switch 402 is in the closed state, the fifth key k5 can be used to open the first gate 7011, and the sixth key k6 can be used to open the second gate 7012. This ensures that the first gate 7011 and the second gate 7012 can only be opened when the grounding switch 402 is in the closed state, which can effectively improve the operational safety of the unlocking process of the prefabricated substation. In addition, when using the third key chain 5 to open the first gate 7011 and the fourth key chain 6 to open the second gate 7012, the time for distinguishing and confirming the matching locks and keys can be saved, which can effectively improve the unlocking efficiency of the box-type substation.

[0071] For example, in Figure 8 In the prefabricated substation shown, the first lock, the second lock, the third lock, and the fourth lock are all of the same type, and can be exemplarily set as follows: Figure 8 In the first lock L1 shown, the first key, the second key, the third key, and the fourth key are all set as the first key k1. Additionally, the fifth lock, the sixth lock, the seventh lock, and the eighth lock are all set as identical locks; for example, they can all be set as... Figure 8 The fifth lock L5 shown in the diagram refers to the fifth key, sixth key, seventh key, and eighth key, all of which are the fifth key k5. This further reduces the time required to distinguish and confirm the aforementioned keys. Thus, in Figure 8 The prefabricated substation shown includes only two types of locks, which can effectively simplify the structure of the prefabricated substation, thereby simplifying the maintenance steps and improving the maintenance efficiency of the prefabricated substation.

[0072] In the Figure 8 When unlocking the prefabricated substation shown, after disconnecting the two circuit breakers in the low-voltage cabinet 1, remove the two first keys k1, then take the two first keys k1 to the high-voltage cabinet 4, and connect the two first keys k1 to a fifth lock L5 at the disconnecting switch 401 respectively, so as to open the disconnecting switch 401. When the disconnecting switch 401 is in the open state, the two first keys k1 are locked in the corresponding fifth lock L5 respectively. At this time, the structure of the prefabricated substation can be referred to Figure 9As shown. It is worth mentioning that during the tripping of the disconnecting switch 401, there is no need to distinguish and confirm the two first keys k1, which can save time for tripping the disconnecting switch 401.

[0073] After the trip disconnect switch 401, refer to Figure 10 , Figure 10 This is a schematic diagram of the disconnector switch 401 in the open state of the prefabricated substation. Next, the grounding switch 402 can be closed to remove the two fifth keys k5 at the grounding switch 402. At this time, both fifth keys k5 can be taken to the transformer room 7. Either fifth key k5 can be used to open the first grid door 7011, and the other fifth key k5 can be used to open the second grid door 7012, thereby opening the first grid door 7011 and / or the second grid door 7012. The structure of the prefabricated substation at this point can be referred to... Figure 11 As shown, maintenance personnel can then inspect and repair the transformer 702 located in cabinet 701 in transformer room 7, which effectively ensures the safety of maintenance personnel. Furthermore, after completing the inspection and repair of transformer 702, the maintenance personnel can relock the prefabricated substation following the reverse steps described above.

[0074] From the above text Figures 8 to 11 As can be seen from the description of the unlocking process of the prefabricated substation, since the prefabricated substation only includes two types of locks, it can effectively simplify the structure of the prefabricated substation and further simplify the unlocking process, thereby improving the maintenance efficiency of the prefabricated substation.

[0075] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A prefabricated substation, characterized in that, Includes low-voltage switchgear, high-voltage switchgear, transformer, first key chain and second key chain; The low-voltage switchgear includes a first circuit breaker and a second circuit breaker; the first circuit breaker is used to control the connection or disconnection between the low-voltage input terminal of the prefabricated substation and one low-voltage winding of the transformer; the second circuit breaker is used to control the connection or disconnection between the low-voltage input terminal of the prefabricated substation and the other low-voltage winding of the transformer. The high-voltage switchgear includes a disconnecting switch, which is used to control the connection or disconnection between the high-voltage winding of the transformer and the output terminal of the prefabricated substation. The first key chain is used to close or open the first circuit breaker, and the second key chain is used to close or open the second circuit breaker; When the first circuit breaker is closed, the first key chain is locked at the first circuit breaker; when the second circuit breaker is closed, the second key chain is locked at the second circuit breaker. When both the first circuit breaker and the second circuit breaker are tripped, the first key chain and the second key chain are used to simultaneously trip the disconnecting switch and are both locked at the disconnecting switch.

2. The prefabricated substation as described in claim 1, characterized in that, The prefabricated substation also includes a first grid door, a second grid door, a third key chain, and a fourth key chain; the high-voltage switch also includes a grounding switch; When the disconnecting switch is closed, the grounding switch is open; when the disconnecting switch is open, the grounding switch is closed. When the grounding switch is closed, the third key chain is used to open the first grid gate, and the fourth key chain is used to open the second grid gate; When the first mesh door is in the open state, the third key chain is locked at the first mesh door; When the second mesh door is open, the fourth key chain is locked at the second mesh door.

3. The prefabricated substation as described in claim 2, characterized in that, The first key chain includes a first key, and the second key chain includes a second key; The first circuit breaker includes a first lock, and when the first circuit breaker is closed, the first key is locked in the first lock; The second circuit breaker includes a second lock, and when the second circuit breaker is closed, the second key is locked in the second lock.

4. The prefabricated substation as described in claim 3, characterized in that, The disconnect switch includes a third lock and a fourth lock; When the disconnecting switch is tripped, the first key is locked in the third lock; When the disconnecting switch is tripped, the second key is locked in the fourth lock.

5. The prefabricated substation as described in claim 3, characterized in that, The disconnect switch includes a third lock and a fourth lock, the first key string also includes a third key, and the second key string also includes a fourth key; When the disconnecting switch is tripped, the third key is locked in the third lock. When the disconnecting switch is tripped, the fourth key is locked in the fourth lock.

6. The prefabricated substation as described in claim 5, characterized in that, The third lock and the fourth lock are of the same type, and the third key and the fourth key are of the same type.

7. The prefabricated substation as described in any one of claims 3 to 6, characterized in that, The first lock and the second lock are of the same type, and the first key and the second key are of the same type.

8. The prefabricated substation as described in any one of claims 2 to 7, characterized in that, The third key chain includes a fifth key, the fourth key chain includes a sixth key, and the grounding switch includes a fifth lock and a sixth lock; When the grounding switch is tripped, the fifth key is locked in the fifth lock and the sixth key is locked in the sixth lock.

9. The prefabricated substation as described in claim 8, characterized in that, The first mesh door includes a seventh lock, and the second mesh door includes an eighth lock; When the grounding switch is closed, the fifth key is used to open the first grid door, and the sixth key is used to open the second grid door; When the first mesh door is opened, the fifth key is locked in the seventh lock; When the second mesh door is opened, the sixth key is locked to the eighth lock.

10. The prefabricated substation as described in claim 8, characterized in that, The first mesh door includes a seventh lock, the second mesh door includes an eighth lock, the third key chain also includes a seventh key, and the fourth key chain also includes an eighth key; When the grounding switch is closed, the seventh key is used to open the first grid door, and the eighth key is used to open the second grid door; When the first mesh door is opened, the seventh key is locked in the seventh lock; When the second mesh door is opened, the eighth key is locked in the eighth lock.

11. The prefabricated substation as described in claim 10, characterized in that, The seventh lock and the eighth lock are of the same type, and the seventh key and the eighth key are of the same type.

12. The prefabricated substation as described in any one of claims 8 to 11, characterized in that, The fifth lock and the sixth lock are of the same type, and the fifth key and the sixth key are of the same type.

13. An energy storage power supply system, characterized in that, The system includes an energy storage device, an energy storage converter, and a prefabricated substation as described in any one of claims 1 to 12, wherein the energy storage converter is used to convert the direct current output by the energy storage device into alternating current and output it to the prefabricated substation, or to convert the alternating current input by the prefabricated substation into direct current and input it to the energy storage device; the prefabricated substation is used to step up the alternating current output by the energy storage converter and output it to the power grid, or to step down the alternating current input by the power grid and input it to the energy storage converter.

14. A photovoltaic power generation system, characterized in that, The system includes an inverter and a prefabricated substation as described in any one of claims 1 to 12, wherein the inverter is used to convert received DC power into AC power and output it to the prefabricated substation, and the prefabricated substation is used to step up the AC power output by the inverter and then output it to the power grid.

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