Power distribution device, power distribution trailer, electric drive system and operation method of electric drive system

Abstract

Embodiments of the present disclosure provide a power distribution device, a power distribution trailer, an electric drive system and an operation method of the electric drive system, wherein the power distribution device includes, in sequence along a first direction: a starting power supply, a switchgear room and a tool room, wherein the switchgear room includes a power supply incoming line cabinet and a load feed outgoing line cabinet arranged in sequence along the first direction; at least one of the power supply incoming line cabinet and the load feed outgoing line cabinet is a gas insulated switchgear, and at least one of the cable connection terminals of the gas insulated switchgear is provided with a cable crimping copper busbar, and the gas insulated switchgear cooperates with the cable crimping copper busbar, and subsequently an ordinary cold shrink terminal joint can be used in combination with the cable crimping copper busbar, so as to finally realize the connection of an external device to the gas insulated switchgear through the cold shrink terminal joint.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a power distribution device, a power distribution trailer, an electric drive system, and an operating method of the electric drive system. Background Art

[0002] With the electrification of well site operations at this stage, electric energy has gradually replaced other energy sources, and electrical equipment supporting the process has also emerged, such as the emergence of electric-driven fracturing equipment. With the changes in the power and number of electrical equipment, there are various requirements for the configuration of power supplies, which puts forward new and higher requirements for distribution devices such as miniaturization, maintenance-free, intelligent, movable and full-operating conditions. In order to meet these requirements, various switch cabinets are constantly emerging. Gas-insulated switch cabinets have excellent insulation performance and excellent cooling arc characteristics due to their fully enclosed and gas-insulated nature. In the application of electrical equipment, gas-insulated switch cabinets have greatly reduced the size and weight of distribution devices, and improved the safety and reliability of distribution device insulation. And meet the requirements for use in harsh environmental conditions such as high altitude, humidity, and dirt. Summary of the invention

[0003] At least one embodiment of the present disclosure provides a power distribution device, which includes, in sequence along a first direction: a starting power supply, a switchgear room, and a tool room, wherein the switchgear room includes a power incoming cabinet and a load feed outgoing cabinet arranged in sequence along the first direction; at least one of the power incoming cabinet and the load feed outgoing cabinet is a gas insulated switch cabinet, and a cable terminal of at least one of the gas insulated switch cabinets is provided with a cable crimping copper busbar.

[0004] For example, in the power distribution device provided in at least one embodiment of the present disclosure, the power incoming cabinet includes a first power incoming cabinet and a second power incoming cabinet; the load feed outgoing cabinet includes a first load feed outgoing cabinet, a second load feed outgoing cabinet and a third load feed outgoing cabinet.

[0005] For example, in the power distribution device provided in at least one embodiment of the present disclosure, the first power incoming cabinet is the gas insulated switch cabinet, and along the second direction, the cable terminal of the first power incoming cabinet includes a first cable terminal and a second cable terminal that are relatively arranged, and the first power incoming cabinet is configured to connect to a first power source through the first cable terminal or the second cable terminal, and the second direction is parallel to the plane where the switchgear room is located and perpendicular to the first direction.

[0006] For example, in the power distribution device provided in at least one embodiment of the present disclosure, at least one of the first cable terminal and the second cable terminal is provided with the cable crimping copper busbar, and the first power supply incoming cabinet is configured to be electrically connected to the first power supply through the cable crimping copper busbar.

[0007] For example, in the power distribution device provided in at least one embodiment of the present disclosure, the second power incoming cabinet is the gas insulated switch cabinet, and along the second direction, the cable terminal of the second power incoming cabinet includes a third cable terminal and a fourth cable terminal that are relatively arranged, and the second power incoming cabinet is configured to be connected to the second power supply through the third cable terminal or the fourth cable terminal.

[0008] For example, in the power distribution device provided in at least one embodiment of the present disclosure, at least one of the third cable terminal or the fourth cable terminal is provided with the cable crimping copper busbar, and the second power supply incoming cabinet is configured to be electrically connected to the second power supply through the cable crimping copper busbar.

[0009] For example, in the power distribution device provided in at least one embodiment of the present disclosure, the first load feeder outlet cabinet, the second load feeder outlet cabinet and the third load feeder outlet cabinet are all the gas insulated switch cabinets; the cable connection terminals of the first load feeder outlet cabinet, the second load feeder outlet cabinet and the third load feeder outlet cabinet are all provided with cable crimping copper busbars, and are respectively configured to be electrically connected to the load equipment through the cable crimping copper busbars.

[0010] For example, in the power distribution device provided in at least one embodiment of the present disclosure, the startup power supply is configured to provide a backup power supply and a startup power supply for the first power supply and the second power supply.

[0011] For example, in the power distribution device provided in at least one embodiment of the present disclosure, the starting power supply includes a black start diesel generator.

[0012] For example, the power distribution device provided by at least one embodiment of the present disclosure further includes at least one of a temperature adjustment component and an alarm component arranged in the switch equipment room, wherein the temperature adjustment component is configured to adjust the temperature of the switch equipment room; and the alarm component is configured to send an alarm signal when a fire occurs.

[0013] For example, in the power distribution device provided in at least one embodiment of the present disclosure, the tool room is a cable storage room.

[0014] For example, in the power distribution device provided in at least one embodiment of the present disclosure, the cable storage room has a plurality of cables and a cable reel, the plurality of cables are arranged on the same cable reel, a partition is provided on the cable reel, the partition separates the plurality of cables and fixes the cable terminals of the plurality of cables respectively.

[0015] For example, in the power distribution device provided in at least one embodiment of the present disclosure, the cable reel adopts a variable frequency power device to retract and release the cable.

[0016] For example, in the power distribution device provided in at least one embodiment of the present disclosure, the gas filled in the gas-insulated switch cabinet is at least one of sulfur hexafluoride and nitrogen.

[0017] For example, the power distribution device provided by at least one embodiment of the present disclosure also includes a bus voltage transformer cabinet, and both the power incoming cabinet and the load feed outgoing cabinet are provided with protection relays, and the bus voltage transformer cabinet is configured to provide voltage signals to the protection relays of the power incoming cabinet and the load feed outgoing cabinet.

[0018] For example, in the power distribution device provided in at least one embodiment of the present disclosure, the protection relay is configured to be connected to a switch or a management machine to achieve remote monitoring.

[0019] At least one embodiment of the present disclosure further provides a power distribution trailer, comprising: a power distribution device provided in any of the above embodiments and a movable trailer, wherein the power distribution device is arranged on a bearing surface of the movable trailer.

[0020] At least one embodiment of the present disclosure further provides an electric drive system, which includes: a distribution trailer provided in any of the above embodiments, a first power source and a load device, wherein the first power source is located on a first side of the distribution trailer, the load device is located on a second side of the distribution trailer, and the first side and the second side are opposite sides.

[0021] For example, the electric drive system provided by at least one embodiment of the present disclosure further includes a second power supply, which is located on the movable trailer and on a side of the starting power supply away from the switchgear room.

[0022] For example, in the electric drive system provided in at least one embodiment of the present disclosure, the load device includes an electric drive fracturing device.

[0023] For example, at least one embodiment of the present disclosure also provides an operating method for an electric drive system, wherein the electric drive system also includes a second power supply, and the power supply line includes a first power supply line cabinet connected to the first power supply, and a second power supply line cabinet connected to the second power supply, the first power supply includes a first generator output switch and a first synchronization device, the first power supply line cabinet includes a first power supply line circuit breaker, the second power supply includes a second generator output switch and a second synchronization device, the second power supply line cabinet includes a second power supply line circuit breaker, and the operating method includes: making at least one of the first power supply and the second power supply work, and when only the first power supply is working: making the first generator output switch in an open state, closing the first power supply line circuit breaker, and then the first generator output switch is synchronously closed through the first synchronization device.

[0024] For example, in the operating method provided in at least one embodiment of the present disclosure, when only the second power supply is working: the second generator export switch is placed in an open state, the second power supply incoming circuit breaker is closed, and then the second generator export switch is synchronously closed through the second synchronization device.

[0025] For example, in the operating method provided in at least one embodiment of the present disclosure, when both the first power supply and the second power supply are working: the closed state of the first power supply incoming circuit breaker is connected in series in the closing circuit of the first generator output switch, and the open state of the first generator output switch is connected in series in the closing circuit of the first power supply incoming circuit breaker; the closed state of the second power supply incoming circuit breaker is connected in series in the closing circuit of the second generator output switch, and the open state of the second generator output switch is connected in series in the closing circuit of the second power supply incoming circuit breaker.

[0026] For example, in the operating method provided by at least one embodiment of the present disclosure, when the first power supply and the second power supply are both working normally, and the first power supply suddenly stops working: the protection fault action first trips the first power supply incoming line circuit breaker, and after the fault is cleared, the first power supply is connected in parallel to the busbar of the distribution device, the first generator output switch is separated, the first power supply incoming line circuit breaker is closed, and the first generator output switch is synchronously closed through the first synchronization device; or, the protection fault action first trips the first generator output switch, and after the fault is cleared, the first power supply is connected in parallel to the busbar of the distribution device, and the first generator output switch is synchronously closed through the first synchronization device.

[0027] For example, in the operating method provided by at least one embodiment of the present disclosure, when the first power supply and the second power supply are both working normally, and the second power supply suddenly stops working: the protection fault action first trips the second power supply incoming line circuit breaker, and after the fault is eliminated, the second power supply is connected in parallel to the bus of the distribution device, and the second generator export switch must first be separated, and then the second power supply incoming line circuit breaker is closed, and the second generator export switch is synchronously closed through the second synchronization device; or, the protection fault action first trips the second generator export switch, and after the fault is eliminated, the second power supply is connected in parallel to the bus of the distribution device, and the second generator export switch is synchronously closed through the second synchronization device.

[0028] For example, in the operating method provided in at least one embodiment of the present disclosure, the load device includes a first load device and a second load device, the load feeder output cabinet includes a first load feeder output cabinet, a second load feeder output cabinet and a third load feeder output cabinet, the first load device is connected to the circuit in the first load feeder output cabinet, the second load device is connected to the circuit in the second load feeder output cabinet, the third load feeder output cabinet is a spare load feeder output cabinet, when the first load feeder output cabinet fails, the first load device is connected to the circuit in the third load feeder output cabinet; or, when the second load feeder output cabinet fails, the second load device is connected to the circuit in the third load feeder output cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure.

[0030] Figure 1 This is an operation mode diagram for a single unit;

[0031] Figure 2 A schematic diagram of the structure of a power distribution device provided in one embodiment of the present disclosure;

[0032] Figure 3A A schematic structural diagram of a cable terminal of a gas insulated switchgear provided in one embodiment of the present disclosure;

[0033] Figure 3B A schematic diagram of the structure of a tool room provided in one embodiment of the present disclosure;

[0034] Figure 4 A schematic diagram of a remote device provided by an embodiment of the present disclosure;

[0035] Figure 5 A schematic structural diagram of a power distribution trailer provided in one embodiment of the present disclosure;

[0036] Figure 6 A schematic diagram of the structure of an electric drive system provided in one embodiment of the present disclosure;

[0037] Figure 7 A schematic diagram of only the first power supply providing power according to an embodiment of the present disclosure;

[0038] Figure 8 A schematic diagram of an electrical interlock provided in accordance with an embodiment of the present disclosure;

[0039] Fig. 9 A schematic diagram of only the second power supply providing power according to an embodiment of the present disclosure;

[0040] Fig.10 A schematic diagram of a first power source and a second power source providing power together according to an embodiment of the present disclosure; and

[0041] Fig.11 A schematic diagram of transferring to another load feeder outgoing line cabinet when a load feeder outgoing line cabinet fails, provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0043] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0044] In the field of oil extraction, mobile power distribution devices are usually used in well sites to distribute electrical energy to electrical equipment in the well sites. The power distribution devices need to be placed on movable trailers. The power distribution devices include medium-voltage switchgear, which includes two types: air-insulated switchgear and gas-insulated switchgear. The volume of the air-insulated cabinet is relatively large. Due to the limitation of the carrying area of ​​the movable trailer, the operating space of the medium-voltage switchgear is greatly limited, so it is necessary to set up a separate operating space. For example, an operating platform is installed on the side of the movable trailer, but when working in different well sites, the corresponding operating platform needs to be overlapped, which complicates the operation process. In addition, many well sites are in plateau environments, which have the characteristics of low air pressure, low temperature, large temperature difference between day and night, low absolute humidity and strong sunshine, which will have a great impact on the insulation, temperature rise and arc extinguishing of electrical equipment. Moreover, electrical equipment is prone to aging in plateau environments. The volume of the gas-insulated switchgear is relatively small, and the load-bearing area of ​​the movable trailer is relatively small. Moreover, after the gas-insulated switchgear is placed on the movable trailer, according to the current size of the movable trailer, there is enough operating space in front of the cabinet, so that the power distribution device has high integration and flexible and convenient operation. In addition, due to the special insulation method of the gas-insulated switchgear, the use environment of the gas-insulated switchgear is not affected by the altitude, and it can be used in various operating environments at various altitudes. Therefore, the power distribution device that distributes electric energy to the electrical equipment in the well site usually adopts a gas-insulated switchgear.

[0045] For example, due to the uncontrollability of the outdoor environment, the hardening degree of the well site ground is also different. The input and output ends of the gas insulated switch cabinet usually use a combination of a T-type cable connector and a T-type plug. However, the T-type cable connector needs to be greased when plugging and unplugging, and the requirements for environmental cleanliness are relatively high when it is reinstalled. Otherwise, dust will enter the inside of the T-type plug and is difficult to clean. The residual dust may cause arc discharge of the T-type cable connector, which poses a safety hazard. Moreover, in the process of transporting the distribution device, the T-type cable connector is difficult to fix and is easily damaged. When selecting the equipment, a special terminal adapter is required to connect to the terminal of the gas insulated switch cabinet. The inventor of the present disclosure has found that the T-type cable connector of the gas insulated switch cabinet can be changed into an ordinary cable crimping copper busbar through an adapter. Subsequently, an ordinary cold shrink terminal connector can be used in combination with the cable crimping copper busbar to finally realize the connection of the external device to the gas insulated switch cabinet through the cold shrink terminal connector. This solves the problem that the T-type connector in the well site needs to be greased when plugging and unplugging, has high requirements for environmental cleanliness, and is difficult to fix and easy to damage during transportation.

[0046] In addition, in the conventional design of well site operations, the power distribution device is directly connected to a single power source, and then the power distribution device is connected to load equipment such as electric-driven fracturing equipment to form a single unit operation mode. For example, Figure 1is an operation mode diagram of a single unit, such as Figure 1 As shown, the external power supply 1 is connected to the power distribution cabinet 2, and the power distribution cabinet 2 and the load device 3 are connected to form an operating mode of a single unit. However, Figure 1 The single power supply mode in the system may no longer work properly due to any of the following problems: (1) the external power supply 1 fails, for example, the gas turbine generator or diesel generator fails, or the power grid is out of power, etc.; (2) the circuit in the distribution cabinet 2 fails; (3) the load device 3 itself fails.

[0047] For example, at least one embodiment of the present disclosure provides a power distribution device, which includes: a starting power supply, a switchgear room and a tool room in sequence along a first direction, wherein the switchgear room includes a power supply incoming line cabinet and a load feed outgoing line cabinet arranged in sequence along the first direction; at least one of the power supply incoming line cabinet and the load feed outgoing line cabinet is a gas insulated switch cabinet, and the cable terminal of at least one gas insulated switch cabinet is provided with a cable crimping copper busbar. In the power distribution device, an ordinary cold shrink terminal connector can be used in combination with a cable crimping copper busbar, so as to connect an external power supply or load equipment to the gas insulated switch cabinet through an ordinary cold shrink terminal connector, so as to solve the problems of T-type cable connectors in the well site that need to be greased when plugging and unplugging, have high requirements for environmental cleanliness, and are difficult to fix and easy to damage during transportation.

[0048] For example, a gas-insulated switchgear is a fully enclosed gas-insulated electrical equipment, which includes circuit breakers, disconnectors, earthing switches, transformers, lightning arresters, busbars, connectors and outgoing line terminals, etc. All of the above components are enclosed in a metal cabinet, and the interior of the metal cabinet is filled with insulating gas at a certain pressure.

[0049] It should be noted that the switchgear room may also include a bus voltage transformer cabinet. Along the first direction, the power incoming cabinet, the load outgoing cabinet and the bus voltage transformer cabinet are arranged in sequence, and the bus voltage transformer cabinet may also be a gas insulated switch cabinet. In some embodiments, the components in the bus voltage transformer cabinet may also be arranged in the power incoming cabinet or the load outgoing cabinet, without the need to separately arrange a bus voltage transformer cabinet.

[0050] For example, Figure 2 This is a schematic diagram of the structure of a power distribution device provided by an embodiment of the present disclosure. For example, Figure 2 For example, a switchgear room includes a power supply incoming line cabinet, a load outgoing line cabinet and a bus voltage transformer cabinet arranged in sequence along a first direction. Figure 2As shown, the power distribution device 20 can be arranged on a movable trailer. Along the first direction A-A', that is, along the direction from the rear to the front of the movable trailer, the power distribution device 20 sequentially includes: a starting power supply 22, a switchgear room 23 and a tool room 24. The switchgear room 23 includes a power incoming line cabinet 231, a load feed outgoing line cabinet 232 and a bus voltage transformer cabinet 233 sequentially arranged along the first direction A-A'. At least one of the power incoming line cabinet 231, the load feed outgoing line cabinet 232 and the bus voltage transformer cabinet 233 is a gas-insulated switch cabinet, and the cable connection terminal of at least one gas-insulated switch cabinet is provided with a cable crimping copper bar.

[0051] For example, the starting power supply 22 includes a black start diesel generator, etc. Black start means that after the entire system stops operating due to a fault, the system is completely powered off and is in a completely "black" state. It does not rely on other network help. The generator sets with self-starting capabilities in the system are started to drive the generator sets without self-starting capabilities, gradually expanding the system recovery range, and finally realizing the recovery of the entire system. When used as an auxiliary device, black start has the advantages of simple structure, low factory power consumption, and fast startup speed.

[0052] For example, Figure 2 As shown, the power incoming cabinet 231 includes a first power incoming cabinet 2311 and a second power incoming cabinet 2312 to ensure that two external power supplies (a first power supply and a second power supply) can be connected to the switch equipment room 23 through the first power incoming cabinet 2311 and the second power incoming cabinet 2312 respectively.

[0053] It should be noted that the power incoming line cabinet 231 may also include more power incoming line cabinets in addition to the first power incoming line cabinet 2311 and the second power incoming line cabinet 2312, which is not limited here.

[0054] For example, Figure 2 As shown, the starting power supply 22, the first power supply incoming line cabinet 2311 and the second power supply incoming line cabinet 2312 are arranged adjacent to each other in sequence, which can shorten the length of the cable and enable the cables to be laid along the same path, thereby reducing the laying cost.

[0055] For example, when the starting power supply 22 is a black start diesel generator, the starting power supply 22 is configured to provide a backup power supply and provide a starting power supply for the first power supply and the second power supply.

[0056] For example, when an external power source such as the first power source or the second power source fails, the starting power source 22 can provide power to auxiliary machines such as ventilation and lubricating oil systems as a backup power source.

[0057] For example, Figure 3A A schematic diagram of the structure of a cable terminal of a gas insulated switchgear provided in an embodiment of the present disclosure. Figure 2 and Figure 3A, the first power supply incoming cabinet 2311 is a gas insulated switch cabinet, along the second direction BB', the cable terminal of the first power supply incoming cabinet 2311 includes a first cable terminal 2311a and a second cable terminal 2311b arranged opposite to each other, and the first power supply incoming cabinet 2311 is configured to be connected to the first power supply through the first cable terminal 2311a or the second cable terminal 2311b. The second direction BB' is parallel to the plane where the switchgear room 23 is located and is perpendicular to the first direction AA'.

[0058] For example, the first power source may be connected to the first power supply incoming cabinet 2311 through the first cable terminal 2311a or the second cable terminal 2311b, that is, the first cable terminal 2311a and the second cable terminal 2311b are both connected to the first power supply incoming cabinet 2311. When the first power source is connected to the first power supply incoming cabinet 2311 through the first cable terminal 2311a, it is ensured that no current is input to the first power supply incoming cabinet 2311 through the second cable terminal 2311b; when the first power source is connected to the first power supply incoming cabinet 2311 through the second cable terminal 2311b, it is ensured that no current is input to the first power supply incoming cabinet 2311 through the first cable terminal 2311a.

[0059] For example, along the second direction BB', that is, in a direction parallel to the plane where the switch equipment room 23 is located and perpendicular to the straight line from the starting power supply 22 to the tool room 24, the first cable terminal 2311a and the second cable terminal 2311b are relatively arranged on the first power supply incoming cabinet 2311. In this way, according to the change of the position of the first power supply, it can be ensured that the cable on the first power supply incoming side will not pass through the bottom of the distribution device, thereby shortening the length of the cable to better achieve electrical connection, and the distribution device can be placed stably.

[0060] For example, the first power source may include a power grid, a diesel generator set, a gas turbine generator set, or other devices or equipment that provide electrical energy.

[0061] For example, Figure 3A As shown, at least one of the first cable terminal 2311a and the second cable terminal 2311b is provided with a cable crimping copper busbar. When both the first cable terminal 2311a and the second cable terminal 2311b are provided with a cable crimping copper busbar, the first power supply incoming cabinet 2311 is electrically connected to the first power supply through the cable crimping copper busbar of the first cable terminal 2311a or the second cable terminal 2311b.

[0062] For example, Figure 3AAs shown, the second power supply incoming cabinet 2312 is a gas insulated switch cabinet, and along the second direction B-B', the cable terminals of the second power supply incoming cabinet 2312 include a third cable terminal 2312a and a fourth cable terminal 2312b that are relatively arranged, and the second power supply incoming cabinet 2312 is configured to be connected to the second power supply through the third cable terminal 2312a or the fourth cable terminal 2312b.

[0063] For example, the second power supply can be connected to the second power supply incoming cabinet 2312 through the third cable terminal 2312a or the fourth cable terminal 2312b, that is, the third cable terminal 2312a and the fourth cable terminal 2312b are both connected to the second power supply incoming cabinet 2312. When the second power supply is connected to the second power supply incoming cabinet 2312 through the third cable terminal 2312a, it is ensured that no current is input to the second power supply incoming cabinet 2312 through the fourth cable terminal 2312b; when the second power supply is connected to the second power supply incoming cabinet 2312 through the fourth cable terminal 2312b, it is ensured that no current is input to the second power supply incoming cabinet 2312 through the third cable terminal 2312a.

[0064] For example, along the second direction B-B', the third cable terminal 2312a and the fourth cable terminal 2312b are relatively arranged on the second power supply incoming cabinet 2312. In this way, according to the change of the position of the second power supply, it can be ensured that the cable on the second power supply incoming side will not pass through the bottom of the distribution device, thereby shortening the length of the cable to better achieve electrical connection, and the distribution device can be placed stably.

[0065] For example, the second power source may include a power grid, a diesel generator set, a gas turbine generator set, or other devices or equipment that provide electrical energy.

[0066] For example, when the first power supply fails, in order to ensure the sequential shutdown of the operation process, the second power supply can also be connected under the condition of meeting the synchronous parallel condition.

[0067] For example, Figure 3A As shown, at least one of the third cable terminal 2312a and the fourth cable terminal 2312b is provided with a cable crimping copper busbar. When both the third cable terminal 2312a and the fourth cable terminal 2312b are provided with a cable crimping copper busbar, the second power supply incoming cabinet 2312 is configured to be electrically connected to the second power supply through the cable crimping copper busbar in the third cable terminal 2312a or the fourth cable terminal 2312b.

[0068] For example, Figure 3A As shown, the load feeder outgoing line cabinet 232 includes a first load feeder outgoing line cabinet 2321 , a second load feeder outgoing line cabinet 2322 and a third load feeder outgoing line cabinet 2323 .

[0069] It should be noted that the load feeder outgoing line cabinet 232 may also include other load feeder outgoing line cabinets in addition to the first load feeder outgoing line cabinet 2321, the second load feeder outgoing line cabinet 2322 and the third load feeder outgoing line cabinet 2323, which is not limited here.

[0070] For example, the first load feeder outgoing line cabinet 2321, the second load feeder outgoing line cabinet 2322 and the third load feeder outgoing line cabinet 2323 are all gas insulated switch cabinets, and the cable connection terminals of at least one of the first load feeder outgoing line cabinet 2321, the second load feeder outgoing line cabinet 2322 and the third load feeder outgoing line cabinet 2323 are provided with cable crimping copper busbars.

[0071] For example, in one example, the cable terminals of the first load feeder outlet cabinet 2321, the second load feeder outlet cabinet 2322 and the third load feeder outlet cabinet 2323 are all provided with cable crimping copper bars. The first load feeder outlet cabinet 2321, the second load feeder outlet cabinet 2322 and the third load feeder outlet cabinet 2323 are respectively configured to be electrically connected to the load device 232 through the cable crimping copper bars.

[0072] For example, when there is a load device, any one of the first load feeder cabinet 2321, the second load feeder cabinet 2322 and the third load feeder cabinet 2323 can be connected to the load device, and the unconnected load feeder cabinet serves as a spare load feeder cabinet. When a line failure occurs at the connected load feeder cabinet, it can be connected to any spare load feeder cabinet.

[0073] For example, when there are two load devices, any two of the first load feeder cabinet 2321, the second load feeder cabinet 2322 and the third load feeder cabinet 2323 can be connected to the load device 232, and the unconnected load feeder cabinet serves as a spare load feeder cabinet. When a line failure occurs at the connected load feeder cabinet, it can be connected to the spare load feeder cabinet.

[0074] For example, Figure 3A As shown, the power distribution device 20 further includes a temperature regulating component 234 disposed in the switchgear room 23, and the temperature regulating component 234 is configured to adjust the temperature of the switchgear room 23. If the temperature regulating component 234 is not disposed in the switchgear room 23, when the power distribution device 20 is in a high temperature environment in summer, the switchgear room 23 can only be used by reducing the capacity, and the temperature regulating component 234 can ensure that the temperature in the switchgear room is maintained in a constant and appropriate range, thereby ensuring that the switchgear room 23 will not be affected by the temperature increase, and will not cause the switchgear room 23 to reduce the capacity.

[0075] For example, the power distribution device 20 further includes an alarm component 235 disposed in the switchgear room 23, and the alarm component 235 is configured to send an alarm signal when a fire occurs. When a fire occurs, the fire alarm signal can be received immediately in the instrument skid or a manned control room, and emergency accidents can be handled in a timely manner.

[0076] For example, Figure 3B A schematic diagram of a tool room according to an embodiment of the present disclosure is shown in FIG. Figure 3B As shown, the tool room 24 is a cable storage room. The cable storage room has a plurality of cables 242 and cable reels 241, for example, Figure 3B The plurality of cables 242 are arranged on the same cable reel 241, and a partition 243 is arranged on the cable reel 241. Figure 3B There are 10 partitions in the cable 243. The partitions 243 separate the plurality of cables 242 and fix the cable terminals 244 of the plurality of cables 242 respectively. Figure 3B In the figure, six groups of cables are respectively located in the storage area defined by the partition, and there is a spacing area between two adjacent groups of cables, which facilitates fixing the cable terminals 244 of the plurality of cables 242 on the partition 243 respectively.

[0077] For example, the cable reel 241 uses a variable frequency power device to retract and release the cable 242 to control the retracting and releasing speed of the cable 242 .

[0078] For example, the gas filled in the gas-insulated switchgear is sulfur hexafluoride (SF 6 ) and nitrogen (N 2 ) When the gas filled in the gas-insulated switchgear is only sulfur hexafluoride (SF 6 ) When used in a gas insulated switchgear, high-purity sulfur hexafluoride gas has good insulation and arc extinguishing properties, thus ensuring the breaking capacity and safety of the gas insulated switchgear.

[0079] For example, Figure 4A schematic diagram of a remote device provided in an embodiment of the present disclosure, wherein protection relays 31 are provided in the power incoming cabinet 231 (including a first power incoming cabinet 2311 and a second power incoming cabinet 2312) and the load feeding outgoing cabinet 232 (including a first load feeding outgoing cabinet 2321, a second load feeding outgoing cabinet 2322 and a third load feeding outgoing cabinet 2323), and the bus voltage transformer cabinet 233 is configured to provide voltage signals to the protection relays 31 of the power incoming cabinet 231 and the load feeding outgoing cabinet 232. The protection relay 31 has protection functions such as quick break, overcurrent, overload, and overvoltage. The current signal required by the protection relay 31 comes from the current transformer in the power incoming cabinet 231 and the load outgoing cabinet 232, and the voltage signal comes from the bus voltage transformer. The protection relay 31 determines whether the corresponding circuit is normal by detecting abnormalities in the access current and voltage signals. If a fault occurs, the protection relay 31 sends a tripping signal to open the circuit breaker, thereby cutting off the faulty circuit to ensure the normal operation of the non-faulty circuit or prevent the expansion of the scope of the accident, so as to protect the connected equipment.

[0080] For example, the protection relays 31 in the power incoming cabinet 231 and the load outgoing cabinet 232 are connected to the switch 32 or the management machine 33 to realize remote monitoring. The specific process is: each protection relay 31 is equipped with an RJ45 or RS485 communication interface, and the RJ45 of each protection relay 31 is connected to the switch 32 through a network cable, or connected to the management machine 33 through the communication interface RS485, and then connected to the PLC or microcomputer monitoring device to realize remote monitoring and control of the power incoming cabinet 231 and the load outgoing cabinet 232 status, and realize the unattended function.

[0081] For example, the power distribution device adopts a single busbar or a single busbar disconnection method to achieve the functions of converging and distributing electric energy.

[0082] For example, the power distribution device 20 can be used to connect medium-voltage electrical equipment in oilfield well site operations with an external power supply. The external power supply can be a power grid, a gas turbine generator, a diesel generator, or other devices or equipment that provide electrical energy. The power distribution device 20 can be used at an electric-driven fracturing site or an oilfield well site with electrified operations.

[0083] An embodiment of the present disclosure further provides a power distribution trailer, for example, Figure 5 A schematic diagram of a power distribution trailer provided in one embodiment of the present disclosure is shown in FIG. Figure 5As shown, the power distribution trailer 40 includes a movable trailer 11 and a power distribution device 20 provided in any of the above embodiments, and the power distribution device 20 is arranged on the bearing surface of the movable trailer 11. Along the direction from the rear to the front of the movable trailer 11, that is, along the first direction A-A', the power distribution device 20 includes: a starting power supply 22, a switchgear room 23 and a tool room 24 in sequence, and the switchgear room 23 includes a power supply incoming line cabinet 231 and a load feed outgoing line cabinet 232 arranged in sequence along the first direction A-A'. At least one of the power supply incoming line cabinet 231 and the load feed outgoing line cabinet 232 is a gas insulated switch cabinet, and the cable terminal of at least one gas insulated switch cabinet is provided with a cable crimping copper busbar.

[0084] It should be noted that the switchgear room 23 may also include a bus voltage transformer cabinet 233. Along the first direction A-A', the power incoming cabinet 231, the load outgoing cabinet 232 and the bus voltage transformer cabinet 233 are arranged in sequence, and the bus voltage transformer cabinet 233 may also be a gas insulated switch cabinet. In some embodiments, the components in the bus voltage transformer cabinet 233 may also be arranged in the power incoming cabinet 231 or the load outgoing cabinet 232, without the need to set up a separate bus voltage transformer cabinet.

[0085] For example, since the starting power supply 22 is heavy, has few external connections, and does not need to be moved frequently, the starting power supply 22 can be placed just above the wheel near the rear of the movable trailer 11. The tool room 24 is relatively light and usually stores a cable reel on which the cable is wound. Placing the tool room 24 at the front of the movable trailer 11 can facilitate the connection of the cable with external equipment. The switchgear room 23 is arranged between the starting power supply 22 and the tool room 24, which can facilitate the incoming and outgoing lines. The power distribution device 20 takes into account both the convenience of use and the distribution of weight.

[0086] An embodiment of the present disclosure further provides an electric drive system, for example, Figure 6 A schematic diagram of the structure of an electric drive system provided in one embodiment of the present disclosure is shown in FIG. Figure 6 As shown, the electric drive system 50 includes the power distribution trailer 40, the first power source 411 and the load device 42 in any of the above embodiments, and the power distribution device 20 is arranged on the bearing surface of the movable trailer 11. The first power source 411 is located on the first side of the power distribution trailer 40, and the load device 42 is located on the second side of the power distribution trailer 40, and the first side and the second side are opposite sides.

[0087] For example, along the extension direction of the bearing surface of the distribution trailer 40, that is, along the direction from the starting power source 22 to the tool room 24, the first side of the distribution trailer 40 is the left side of the bearing surface of the distribution trailer 40, and the second side of the distribution trailer 40 refers to the right side of the bearing surface of the distribution trailer 40. For example, the electric drive system further includes a second power source 412, which is located on the movable trailer 11 and on the side of the starting power source 22 away from the switchgear room 23.

[0088] For example, the above-mentioned arrangement structure of the electric drive system 50 can make the structure of the electric drive system 50 more compact, so as to reduce the length of the cables used.

[0089] It should be noted that the first power source 411 and the load device 42 may also be located on the same side of the power distribution trailer 40, which is not limited here.

[0090] For example, Figure 6 As shown, the first power source 411 and the second power source 412 can be various devices or equipment for providing electrical energy, such as a power grid, a gas turbine generator, and a diesel generator. The following description takes the first power source 411 as a gas turbine generator and the second power source 412 as a diesel generator as an example.

[0091] For example, the load device 42 may include a first load device 421 and a second load device 422. The first load device 421 and the second load device 422 may both be electric-driven fracturing devices.

[0092] For example, along the direction from the rear to the front of the movable trailer 11, that is, along the first direction A-A', the power distribution device 20 includes: a starting power supply 22, a switchgear room 23 and a tool room 24 in sequence, and the switchgear room 23 includes a power incoming line cabinet 231, a load feed outgoing line cabinet 232 and a bus voltage transformer cabinet 233 arranged in sequence along the first direction A-A', and at least one of the power incoming line cabinet 231, the load feed outgoing line cabinet 232 and the bus voltage transformer cabinet 233 is a gas insulated switch cabinet, and the cable terminal of at least one gas insulated switch cabinet is provided with a cable crimping copper bar. The power supply 41 is configured to be electrically connected to the power incoming line cabinet 231.

[0093] For example, in the general structure of the electric drive system, the T-type cable connector and the T-type plug of the gas-insulated switchgear are usually combined. The inventors of the present disclosure noticed that the gas-insulated switchgear adopts the T-type cable connector, and the air-insulated switchgear adopts the cable crimping copper busbar cable connector. The width of the gas-insulated switchgear is much smaller than that of the air-insulated switchgear. Usually, the equipment does not need to be disassembled frequently after one-time installation, and the use environment is relatively clean. However, the operating conditions of the well site require frequent installation and disassembly, and the external environment is mostly dust and gravel. The T-type cable connector cannot meet such requirements. Therefore, an ordinary cold shrink terminal connector can be combined with a cable crimping copper busbar. After the T-type cable connector is changed to a cable crimping copper busbar through a cable terminal adapter in the gas-insulated switchgear, the external power supply or load equipment can be connected to the gas-insulated switchgear through an ordinary cold shrink terminal connector, so as to solve the problems of the T-type cable connector in the well site that needs to be greased when plugging and unplugging, has high requirements for environmental cleanliness, and is difficult to fix and easy to damage during transportation.

[0094] For example, Figure 6 As shown, the power supply incoming line cabinet 231 includes a first power supply incoming line cabinet 2311, the first power supply incoming line cabinet 2311 is a gas insulated switch cabinet, and the power supply 41 includes a first power supply 411. Figure 3A and Figure 6 , along the second direction BB', the second direction BB' is parallel to the plane where the switch equipment room 20 is located and perpendicular to the first direction AA', the cable terminal of the first power incoming cabinet 2311 includes a first cable terminal 2311a and a second cable terminal 2311b arranged opposite to each other, and the first power incoming cabinet 2311 is connected to the first power supply 411 through the first cable terminal 2311a or the second cable terminal 2311b.

[0095] For example, Figure 3A and Figure 6 As shown, at least one of the first cable terminal 2311a and the second cable terminal 2311b is provided with a cable crimping copper busbar, and the first power supply incoming cabinet 2311 is electrically connected to the first power supply 411 via the cable crimping copper busbar.

[0096] For example, combined with Figure 3A and Figure 6 As shown, the power incoming cabinet 231 also includes a second power incoming cabinet 2312, which is a gas insulated switch cabinet. Along the second direction B-B', the cable terminals of the second power incoming cabinet 2312 include a third cable terminal 2312a and a fourth cable terminal 2312b that are relatively arranged. The second power incoming cabinet 2312 is configured to be connected to the second power supply 412 via the third cable terminal 2312a or the fourth cable terminal 2312b.

[0097] For example, Figure 3A and Figure 6 As shown, at least one of the third cable terminal 2312a or the fourth cable terminal 2312b is provided with a cable crimping copper busbar, and the second power supply incoming cabinet 2312 is electrically connected to the second power supply 412 via the cable crimping copper busbar.

[0098] For example, Figure 3A and Figure 6 As shown, the load feeder outgoing line cabinet 232 includes a first load feeder outgoing line cabinet 2321, a second load feeder outgoing line cabinet 2322 and a third load feeder outgoing line cabinet 2323. The first load feeder outgoing line cabinet 2321, the second load feeder outgoing line cabinet 2322 and the third load feeder outgoing line cabinet 2323 are all gas insulated switch cabinets, and the cable connection terminals of the first load feeder outgoing line cabinet 2321, the second load feeder outgoing line cabinet 2322 and the third load feeder outgoing line cabinet 2323 are all provided with cable crimping copper busbars, and are respectively configured to be electrically connected to the load equipment 42 through the cable crimping copper busbars.

[0099] For example, a gas-insulated switchgear is a fully enclosed gas-insulated electrical equipment, which includes circuit breakers, disconnectors, earthing switches, transformers, lightning arresters, busbars, connectors and outgoing line terminals, etc. All of the above components are enclosed in a grounded metal cabinet, and the interior of the metal cabinet is filled with insulating gas at a certain pressure.

[0100] For example, other related structures of the power distribution device in the electric drive system can refer to the related description of the power distribution device above, which will not be repeated here. The power distribution device in the electric drive system may also include an alarm component, a temperature adjustment component, and a component for realizing remote monitoring.

[0101] For example, at least one embodiment of the present disclosure further provides an operation method of an electric drive system, the electric drive system further comprising a second power supply 412, the power supply incoming line cabinet 231 comprising a first power supply incoming line cabinet 2311 connected to the first power supply 411, and a second power supply incoming line cabinet 2312 connected to the second power supply 412, the first power supply 411 comprising a first generator outlet switch 52G1 and a first synchronization device 251, the first power supply incoming line cabinet 2311 comprising a first power supply incoming line circuit breaker 51M1, the second power supply 412 comprising a second generator outlet switch 52G2 and a second synchronization device 252, the second power supply incoming line cabinet 2312 comprising a second power supply incoming line circuit breaker 52M2, the operation method comprising: operating at least one of the first power supply 411 and the second power supply 412. For example, the first power supply 411 is connected to a circuit in the first power supply incoming line cabinet 2311, and the second power supply 412 is connected to a circuit in the second power supply incoming line cabinet 2312. In actual operation, the following situations may exist: (1) only the first power supply 411 works normally, and the second power supply 412 is in a non-working state; (2) only the second power supply 412 works normally, and the first power supply 411 is in a non-working state.

[0102] For example, Figure 7 A schematic diagram of only the first power supply providing power according to an embodiment of the present disclosure, such as Figure 7 As shown, the first power supply 411 is connected to the circuit in the first power supply incoming cabinet 2311 and is electrically connected, and the second power supply 412 is not connected to the circuit in the second power supply incoming cabinet 2312, so that only the first power supply 411 provides external power. Figure 8 This is a schematic diagram of an electrical interlock provided by an embodiment of the present disclosure. Figure 7 and Figure 8 As shown, the closing and power supply process when only the first power supply 411 is working is as follows: the first generator output switch 52G1 is in the open state, the first power supply incoming line circuit breaker 52M1 is closed, and then the first generator output switch 52G1 is synchronously closed through the first synchronization device 251.

[0103] For example, Fig. 9 A schematic diagram of only the second power supply is provided in an embodiment of the present disclosure, such as Fig. 9 As shown, for the case where only the second power supply 412 is working normally and the first power supply 411 is in a non-working state: the second power supply 412 is connected to the circuit in the second power supply incoming line cabinet 2312 and is electrically connected, and the first power supply 411 is not connected to the circuit in the first power supply incoming line cabinet 2311, so that only the second power supply 412 provides external power. Figure 8 and Fig. 9The process of closing the switch and supplying power when only the second power supply 412 is working is as follows: the second generator output switch 52G2 is in the open state, the second power supply incoming circuit breaker 52M2 is closed, and then the second generator output switch 52G2 is synchronously closed through the second synchronization device 252.

[0104] If the working power supply (the first power supply 411 or the second power supply 412) stops working suddenly, it will quickly switch to another power supply that is in a non-working state to ensure the normal shutdown or normal operation of the operation.

[0105] In actual operation, poor working conditions may occur. If the capacity of any one of the first power supply 411 and the second power supply 412 cannot meet the on-site operation requirements, the first power supply 411 and the second power supply 412 need to be quickly used in parallel. The first power supply 411 and the second power supply 412 after parallel use jointly supply power to the load device to meet the power supply requirements. For example, Fig.10 A schematic diagram of two power supplies for common power supply provided in one embodiment of the present disclosure. Because a short-circuit fault occurs during asynchronous parallel closing, irreversible damage will be caused to the first power supply 411 and the second power supply 412. The synchronous parallel closing of the first power supply 411 and the second power supply 412 can be achieved through the electrical interlock between the first power supply incoming line cabinet 2311 and the second power supply incoming line cabinet 2312 in the switch equipment room 23 to prevent the occurrence of asynchronous parallel closing. For example, Figure 8 and Fig.10 As shown, the process of synchronous parallel closing and power transmission of the first power supply 411 and the second power supply 412 is: the closed state of the first power supply incoming circuit breaker 52M1 is connected in series in the closing circuit of the first generator output switch 52G1, the open state of the first generator output switch 52G1 is connected in series in the closing circuit of the first power supply incoming circuit breaker 52M1, the closed state of the second power supply incoming circuit breaker 52M2 is connected in series in the closing circuit of the second generator output switch 52G2, and the open state of the second generator output switch 52G2 is connected in series in the closing circuit of the second power supply incoming circuit breaker 52M2. Such an electrical interlocking circuit ensures the reliability of the operation sequence.

[0106] In actual operation, the following situations may also occur: (1) When the first power supply 411 and the second power supply 412 are both working normally, the first power supply 411 suddenly stops working; (2) When the first power supply 411 and the second power supply 412 are both working normally, the second power supply 412 suddenly stops working.

[0107] For example, combined with Figure 8For the above situation (1), the following process will occur: the protection fault action first trips the first power supply incoming line circuit breaker 52M1. After the fault is eliminated, the first power supply 411 needs to be connected to the busbar of the distribution device in parallel. First, the first generator output switch 52G1 must be opened, and then the first power supply incoming line circuit breaker 52M1 must be closed. After the first synchronization device 251 detects and satisfies the synchronous parallel condition, the first generator output switch 52G1 is closed; or, the protection fault action first trips the first generator output switch 52G1. After the fault is eliminated, the first power supply 411 needs to be connected to the busbar of the distribution device in parallel. After the first synchronization device 251 detects and satisfies the synchronous parallel condition, the first generator output switch 52G1 is closed.

[0108] For example, combined with Figure 8 For the above situation (2), the following process will occur: the protection fault action first trips the second power supply incoming line circuit breaker 52M2. After the fault is eliminated, the second power supply 412 needs to be connected to the busbar of the distribution device in parallel. First, the second generator output switch 52G2 needs to be opened, and then the second power supply incoming line circuit breaker 52M2 needs to be closed. After the second synchronization device 252 detects and satisfies the synchronous parallel condition, the second generator output switch 52G2 needs to be closed; or, the protection fault action first trips the second generator output switch 52G2. After the fault is eliminated, the second power supply 412 needs to be connected to the busbar of the distribution device in parallel. After the second synchronization device 252 detects and satisfies the synchronous parallel condition, the second generator output switch 52G2 needs to be closed.

[0109] For example, Fig.11 A schematic diagram of transferring to another load feeder output cabinet when a load feeder output cabinet fails is provided in an embodiment of the present disclosure, wherein a first load device 421 is connected to a circuit in the first load feeder output cabinet 2321, a second load device 422 is connected to a circuit in the second load feeder output cabinet 2322, and a third load feeder output cabinet 2323 is a spare load feeder output cabinet. When the first load feeder output cabinet 2321 fails, the first load device 421 will be connected to the circuit in the third load feeder output cabinet 2323, or, when the second load feeder output cabinet 2322 fails, the second load device 422 can be connected to the circuit in the third load feeder output cabinet 2323. The bus voltage transformer cabinet 233 also has a circuit.

[0110] For example, protection relays are provided in the power incoming cabinet 231 (including the first power incoming cabinet 2311 and the second power incoming cabinet 2312) and the load outgoing cabinet 232 (including the first load outgoing cabinet 2321, the second load outgoing cabinet 2322 and the third load outgoing cabinet 2323), and the bus voltage transformer cabinet 233 provides voltage signals for the protection relays of the power incoming cabinet 231 and the load outgoing cabinet 232. The current signal required by the protection relay comes from the current transformers in the power incoming cabinet 231 and the load outgoing cabinet 232, and the voltage signal comes from the bus voltage transformer. The protection relay determines whether the corresponding circuit is normal by detecting the abnormality of the access current and voltage signals. If a fault occurs, the protection relay sends a tripping signal to open the circuit breaker, thereby cutting off the faulty circuit, ensuring the normal operation of the non-faulty circuit or preventing the expansion of the scope of the accident, so as to protect the connected equipment.

[0111] The power distribution device, power distribution trailer, electric drive system and operation method of the electric drive system provided by the embodiments of the present disclosure have at least one of the following beneficial effects:

[0112] (1) In the power distribution device provided by at least one embodiment of the present disclosure, the T-type cable connector is replaced by an ordinary cable crimping copper busbar, and the gas-insulated switch cabinet is matched with the cable crimping copper busbar. Subsequently, an ordinary cold shrink terminal connector can be used in combination with the cable crimping copper busbar to finally realize the connection of an external device to the gas-insulated switch cabinet through the cold shrink terminal connector, thereby solving the problems of the T-type cable connector in the well site that requires grease when plugging and unplugging, has high requirements for environmental cleanliness, and is difficult to fix and easy to be damaged during transportation.

[0113] (2) The power distribution device provided by at least one embodiment of the present disclosure can ensure that the cables on the external power supply input side do not pass through the bottom of the power distribution device according to the change of the location of the external power supply, thereby shortening the length of the cable to better achieve electrical connection and allowing the power distribution device to be placed stably.

[0114] (3) In the power distribution device provided by at least one embodiment of the present disclosure, the starting power supply, the first power supply incoming line cabinet and the second power supply incoming line cabinet are arranged adjacent to each other in sequence, so as to shorten the length of the cable.

[0115] (4) In the power distribution device provided by at least one embodiment of the present disclosure, when an external power supply fails, the starting power supply can provide power to auxiliary machines such as ventilation and lubricating oil systems as a backup power supply.

[0116] (5) The power distribution trailer provided in at least one embodiment of the present disclosure can be moved and used at an electric fracturing site or an oil field well site for electrified operations.

[0117] There are a few points to note:

[0118] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0119] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is enlarged or reduced, that is, these drawings are not drawn according to the actual scale.

[0120] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0121] The above description is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims

1. A power distribution device, sequentially along a first direction include: Starting power supply, switchgear room and tool room, where: The switchgear room comprises a power supply incoming line cabinet and a load outgoing line cabinet arranged in sequence along the first direction, and the power supply incoming line cabinet and the load outgoing line cabinet are both provided with a protection relay; At least one of the power supply incoming line cabinet and the load outgoing line cabinet is a gas insulated switch cabinet, and a cable connection terminal of at least one of the gas insulated switch cabinets is provided with a cable crimping copper busbar; The power incoming cabinet includes a first power incoming cabinet and a second power incoming cabinet, the first power incoming cabinet is the gas insulated switch cabinet, along the second direction, the cable terminals of the first power incoming cabinet include a first cable terminal and a second cable terminal arranged oppositely, the first power incoming cabinet is configured to connect to a first power source through the first cable terminal or the second cable terminal, the second direction is parallel to the plane where the switchgear room is located and perpendicular to the first direction, the first power incoming cabinet is configured to be electrically connected to the first power source through the cable crimping copper busbar; the second power incoming cabinet is the gas insulated switch cabinet, along the second direction, the cable terminals of the second power incoming cabinet include a third cable terminal and a fourth cable terminal arranged oppositely, the second power incoming cabinet is configured to be connected to a second power source through the third cable terminal or the fourth cable terminal; the second power incoming cabinet is configured to be electrically connected to the second power source through the cable crimping copper busbar.

2. The power distribution device according to claim 1, in, The load feeder outgoing line cabinet comprises a first load feeder outgoing line cabinet, a second load feeder outgoing line cabinet and a third load feeder outgoing line cabinet.

3. The power distribution device according to claim 2, in, At least one of the first cable connection terminal and the second cable connection terminal is provided with the cable crimping copper busbar.

4. The power distribution device according to claim 3, in, At least one of the third cable connection terminal or the fourth cable connection terminal is provided with the cable crimping copper busbar.

5. The power distribution device according to claim 3, in, The first load feeder outgoing line cabinet, the second load feeder outgoing line cabinet and the third load feeder outgoing line cabinet are all the gas insulated switch cabinets; The cable connection terminals of the first load feeder outgoing line cabinet, the second load feeder outgoing line cabinet and the third load feeder outgoing line cabinet are all provided with cable crimping copper bars, and are respectively configured to be electrically connected to load equipment through the cable crimping copper bars.

6. The power distribution device according to claim 3, in, The startup power supply is configured to provide a backup power supply and a startup power supply for the first power supply and the second power supply.

7. The power distribution device according to claim 6, in, The starting power supply includes a black start diesel generator.

8. The power distribution device according to claim 1, in, It also includes at least one of a temperature regulating component and an alarm component arranged in the switchgear room, The temperature regulating component is configured to adjust the temperature of the switchgear room; The alarm component is configured to send out an alarm signal when a fire occurs.

9. The power distribution device according to claim 1, in, The tool room is a cable storage room.

10. The power distribution device according to claim 9, in, The cable storage room is provided with a plurality of cables and a cable reel. The plurality of cables are arranged on the same cable reel. The cable reel is provided with a partition plate. The partition plate separates the plurality of cables and fixes the cable terminals of the plurality of cables respectively.

11. The power distribution device according to claim 10, in, The cable reel adopts a variable frequency power device to retract and release the cable.

12. The power distribution device according to any one of claims 1 to 3, in, The gas filled in the gas-insulated switch cabinet is at least one of sulfur hexafluoride and nitrogen.

13. The power distribution device according to claim 1, further comprising a bus voltage transformer cabinet, in, The bus voltage transformer cabinet is configured to provide voltage signals to the protection relays of the power incoming cabinet and the load outgoing cabinet.

14. The power distribution device according to claim 13, in, The protection relay is configured to be connected to a switch or a management machine to achieve remote monitoring.

15. A power distribution trailer, include: The power distribution device and movable trailer according to any one of claims 1 to 14, wherein the power distribution device is arranged on a bearing surface of the movable trailer.

16. An electric drive system, comprising the power distribution trailer according to claim 15, a first power source and a load device, in, The first power source is located on a first side of the power distribution trailer, and the load device is located on a second side of the power distribution trailer, and the first side and the second side are opposite sides.

17. The electric drive system according to claim 16, further comprising a second power source, in, The second power source is located on the movable trailer and is located on a side of the starting power source away from the switchgear room.

18. The electric drive system according to claim 16, in, The load equipment includes an electrically driven fracturing device.

19. A method for operating an electric drive system according to claim 16, in, The electric drive system further includes a second power supply, the power supply incoming cabinet includes a first power supply incoming cabinet connected to the first power supply, and a second power supply incoming cabinet connected to the second power supply, the first power supply includes a first generator output switch and a first synchronization device, the first power supply incoming cabinet includes a first power supply incoming circuit breaker, the second power supply includes a second generator output switch and a second synchronization device, and the second power supply incoming cabinet includes a second power supply incoming circuit breaker, The operating method includes: operating at least one of the first power supply and the second power supply, When only the first power source is working: the first generator output switch is placed in an open state, the first power source incoming line circuit breaker is closed, and then the first generator output switch is synchronously closed through the first synchronization device.

20. The operating method according to claim 19, in, When only the second power supply is working: The second generator output switch is placed in an open state, the second power supply incoming line circuit breaker is closed, and then the second generator output switch is synchronously closed through the second synchronization device.

21. The operating method according to claim 19, in, When both the first power supply and the second power supply are working: Connecting the closed state of the first power supply incoming line circuit breaker in series to the closing circuit of the first generator output switch, and connecting the open state of the first generator output switch in series to the closing circuit of the first power supply incoming line circuit breaker; The closed state of the second power supply incoming line circuit breaker is connected in series in the closing circuit of the second generator output switch, and the open state of the second generator output switch is connected in series in the closing circuit of the second power supply incoming line circuit breaker.

22. The operating method according to claim 21, in, When the first power supply and the second power supply are both working normally, and the first power supply suddenly stops working: The protection fault action first trips the first power supply incoming line circuit breaker. After the fault is eliminated, the first power supply is connected in parallel to the busbar of the power distribution device, the first generator output switch is disconnected, the first power supply incoming line circuit breaker is closed, and the first generator output switch is synchronously closed through the first synchronization device; or, The protection fault action first trips the first generator export switch. After the fault is eliminated, the first power supply is connected in parallel to the busbar of the distribution device, and the first generator export switch is synchronously closed through the first synchronization device.

23. The operating method according to claim 21, in, When the first power supply and the second power supply are both working normally, and the second power supply suddenly stops working: The protection fault action first trips the second power supply incoming line circuit breaker. After the fault is eliminated, the second power supply is connected in parallel to the busbar of the power distribution device, the second generator output switch is disconnected, the second power supply incoming line circuit breaker is closed, and the second generator output switch is synchronously closed through the second synchronization device; or, The protection fault action first trips the second generator export switch. After the fault is eliminated, the second power supply is connected in parallel to the busbar of the distribution device, and the second generator export switch is synchronously closed through the second synchronization device.

24. The operating method according to any one of claims 19 to 23, in, The load device includes a first load device and a second load device, the load feeder outgoing line cabinet includes a first load feeder outgoing line cabinet, a second load feeder outgoing line cabinet and a third load feeder outgoing line cabinet, the first load device is connected to the circuit in the first load feeder outgoing line cabinet, the second load device is connected to the circuit in the second load feeder outgoing line cabinet, the third load feeder outgoing line cabinet is a spare load feeder outgoing line cabinet, When the first load feeder outgoing line cabinet fails, the first load device is connected to the circuit in the third load feeder outgoing line cabinet; or, When the second load feeder outgoing line cabinet fails, the second load device is connected to the circuit in the third load feeder outgoing line cabinet.

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