System and method for quickly recovering power supply in fault state

Abstract

The invention belongs to the technical field of power transformation, and particularly relates to a system and a method for quickly recovering power supply in a fault state. In a substation, a first transformer and a second transformer are used to convert a high voltage into a low voltage. One end of the first transformer connected with the power supply is a high-voltage side input end of the transformer 1, and the other side of the first transformer connected with the power supply is a low-voltage side output end of the transformer 1; one end of the second transformer connected with the power supply side is a high-voltage side input end of the transformer, and the other side of the second transformer connected with the power supply side is a low-voltage side output end of the transformer. Power supply is more reliable, line switch faults can be overhauled, replaced and handled without power outage, power can be provided for all or part of electricity users in time under the condition that two transformers of a transformer substation break down at the same time or multiple devices break down at the same time, power supply can be recovered rapidly, power of the two transformers of the transformer substation is shared, and the service life of the transformers is prolonged. Equipment damage or power supply stopping caused by transformer overload is prevented.

Description

Technical Field

[0001] The present invention belongs to the technical field of power transformation, and in particular relates to a system and method for quickly restoring power supply under a fault state. Background Art

[0002] Power supply companies generally transmit electricity through substations. The power supply equipment inside the substation will first convert high voltage into low voltage, and then distribute the electricity to multiple electricity users through power supply lines. Since the substation is located in a remote area and most of the power supply equipment is operated outdoors, it is easy for the power supply equipment to malfunction due to harsh environments such as rain, snow, strong winds, and floating objects, which will interrupt the power supply to electricity users.

[0003] Under normal circumstances, when a power supply device fails, maintenance personnel will go to a remote substation to handle the failure. The power supply can be restored only after the failure is fixed. However, since the substation is located far away, it takes a certain amount of time to restore the power supply. Since the power supply equipment is damaged, it takes a certain amount of time to repair it, which may also cause a longer power outage. However, due to some special industries, such as hospitals, mines and other important power users, long-term power outages are not allowed, otherwise it will cause greater economic losses to the power users, and in serious cases, it will also endanger personal safety.

[0004] Therefore, in order to ensure the continuity and reliability of power supply, it is necessary to develop a system and method that can quickly restore power supply in a fault state. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned prior art, the present invention provides a system and method for quickly restoring power supply under fault conditions. The purpose is to connect the power supply equipment in the substation to the system of the present invention, and when different or multiple power supply equipment in the substation fails, the power supply to the power user can be quickly restored by changing the system operation mode.

[0006] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: A system for rapidly restoring power supply under a fault state, in which a high voltage is converted into a low voltage by a first transformer and a second transformer in a transformer substation, wherein one end of the first transformer connected to a power source is a high voltage input end of the transformer 1, and the other end of the first transformer connected to the power source is a low voltage output end of the transformer 1; one end of the second transformer connected to the power source is a high voltage input end of the transformer, and the other end of the second transformer connected to the power source is a low voltage output end of the transformer; the voltage values ​​connected to the high voltage input end of the first transformer and the high voltage input end of the second transformer are the same, and the voltage values ​​output by the low voltage output end of the first transformer and the low voltage output end of the second transformer are the same; the power switch controls the connection or disconnection of the power source, the load side line is connected to the power user, one end of the load side line is the power source side, and the other end of the load side line is the load side, and each load side line is connected to one power user.

[0007] Furthermore, the power switch includes two states: open and closed. In the open state, both sides of the power switch are not conductive, and in the closed state, both sides of the power switch are conductive; one end of the power switch is the power side, and the other end of the power switch is the load side; the power switch includes a first transformer power switch BYQ1, a second transformer power switch BYQ2, a line power switch XL, a side power switch CL, a busbar power switch ML, and a tie line power switch LLX.

[0008] Furthermore, the first transformer power switch BYQ1 includes: BYQ1-1, BYQ1-2, BYQ1-3, BYQ1-4; the first transformer power switch BYQ1-1 is connected to the load side of the first transformer power switch BYQ1-2, and then the load side of the first transformer power switch BYQ1-2 is connected to the power side of the first transformer power switch BYQ1-3, the power side of the first transformer power switch BYQ1-1 is connected to any point of the first bus, and the first The power supply side of the transformer power switch BYQ1-2 is connected to any point of the second busbar; the load side of the first transformer power switch BYQ1-3 is simultaneously connected to the low voltage side of the first transformer and the power supply side of the first transformer power switch BYQ1-4, and the load side of the first transformer power switch BYQ1-4 is connected to any point on the third busbar; the second transformer power switch BYQ2 includes: second transformer power switches BYQ2-1, BYQ2-2, BYQ2-3, BYQ2-4; The load sides of the second transformer power switch BYQ2-1 and the second transformer power switch BYQ2-2 are connected, and then connected to the power side of the second transformer power switch BYQ2-3. The power side of the second transformer power switch BYQ2-1 is connected to any point of the first bus, and the power side of the second transformer power switch BYQ2-2 is connected to any point of the second bus; the load side of the second transformer power switch BYQ2-3 is simultaneously connected to the low-voltage side of the second transformer and the power side of the second transformer power switch BYQ2-4, and the load side of the second transformer power switch BYQ2-4 is connected to any point on the third bus.

[0009] Furthermore, the line power switch XL includes: a first line power switch, a second line power switch, a third line power switch and a fourth line power switch; the first line power switch includes XL1-1, XL1-2, XL1-3, and XL1-4, the load sides of the first line power switches XL1-1 and XL1-2 are connected, and then connected to the power side of the first line power switch XL1-3, the power side of the first line power switch XL1-1 is connected to any point of the first bus, and the power side of the first line power switch XL1-2 is connected to the second bus any point on the line; the load side of the 1st line power switch XL1-3 is simultaneously connected to the power side of the 1st load line and the power side of the line power switch XL1-4, the load side of the 1st load line is connected to the 1st electricity user, and the load side of the 1st line power switch XL1-4 is connected to any point on the 3rd bus; the 2nd line power switch - the 4th line power switch include: the 2nd line power switch XL2-1, XL2-2, XL2-3, XL2-4 - the 4th line power switch XL4-1, XL4-2, XL4-3, XL4-4.

[0010] Furthermore, the side power switch CL includes: CL1-1, CL1-2, CL1-3, and CL1-4. The load sides of the side power switch CL1-1 and the side power switch CL1-2 are connected, and then connected to the power side of the side power switch CL1-3. The power side of the side power switch CL1-1 is connected to any point of the first bus, and the power side of the side power switch CL1-2 is connected to any point of the second bus; the load side of the side power switch CL1-3 is connected to the power side of the side power switch CL1-4, and the load side of the side power switch CL1-4 is connected to any point on the third bus.

[0011] Furthermore, the bus tie power switch ML is ML1-1, the power side of the bus tie power switch ML1-1 is connected to any point of the first bus, and the load side of the bus tie power switch ML1-1 is connected to any point of the second bus; the tie line power switch LLX includes: tie line power switches LLX1-1, LLX1-2, LLX1-3, and LLX1-4, the tie line power switch LLX1-1 and the load side of the tie line power switch LLX1-2 are connected, and then connected to the power side of the tie line power switch LLX1-3, the power side of LLX1-1 is connected to any point on the first bus, and the power side of the tie line power switch LLX1-2 is connected to any point on the second bus; the load side of the tie line power switch LLX1-3 is simultaneously connected to the load side of the tie line power switch LLX1-3' of the second substation and the power side of the tie line power switch LLX1-4, and the load side of the tie line power switch LLX1-4 is connected to any point on the third bus.

[0012] A method for quickly restoring power supply under a fault state is implemented by using the system for quickly restoring power supply under a fault state; when the substation is operating normally, the first transformer power switch BYQ1-1 and the second transformer power switch BYQ2-2 are in a closed state, at this time, the first line power switch XL1-1 and the third line power switch XL3-1 are closed state line power switches, the second line power switch XL2-2 and the fourth line power switch XL4-2 are in a closed state, the first line power switch XL1-3, the second line power switch XL2-3 ... the fourth line power switch XL4-3 are in a closed state, the first line power switch XL1-4, the second line power switch XL2-4 ... the fourth line power switch XL4-4 are in a closed state, and the remaining power switches are in an open state, at this time, the first power user, the second power user ... the fourth power user are powered normally.

[0013] Furthermore, when the transformer control switch fails, the first transformer power switch BYQ1-1 or the first transformer power switch BYQ1-3 fails to be in the open state, at which time the first power user and the third power user are stopped from supplying power; when the main power switch ML1-1 is in the closed state, the first power user and the third power user are restored to power supply.

[0014] Furthermore, when the line control switch fails, the line power switch XL1-1 or the line power switch XL1-3 is in the open state, and the power supply to the first electricity user is stopped; when the line power switch XL1-4, the side power switch CL1-1, the side power switch CL1-3, and the side power switch CL1-4 are in the closed state, the power supply to the first electricity user is restored.

[0015] Furthermore, when the bus fails, the first bus fails and stops running, and the first power user and the third power user stop supplying power; when the side power switch CL1-2, the side power switch CL1-3, and the side power switch CL1-4 are in the closed state, and the line power switches XL1-4 and XL3-4 are in the closed state, the first power user and the third power user resume supplying power; When two busbars fail at the same time, the first transformer power switch BYQ1-1, the first transformer power switch BYQ1-3, the second transformer power switch BYQ2-1, and the second transformer power switch BYQ2-3 are in the open state, and the first power user, the second power user ... the fourth power user are in the power supply stop state; when the first transformer power switch BYQ1-4 is in the closed state, the line power switches XL1-4, XL2-4 ... XL4-4 are in the closed state, and the first power user, the second power user ... the fourth power user are restored to power supply; When the 1st bus, the 2nd bus, the 1st transformer and the 2nd transformer fail at the same time, power supply to the 1st electricity user, the 2nd electricity user ... the 4th electricity user is stopped; when the interconnection line power switch LLX1-4 is in the closed state, the line power switch XL1-4, the line power switch XL2-4 ... the line power switch XL4-4 are in the closed state, then power supply to the 1st electricity user, the 2nd electricity user ... the 4th electricity user is restored.

[0016] The present invention has the following beneficial effects and advantages: The present invention uses a double-bus power supply mode, in which when one bus fails, the other bus can be used to supply power in time, which is more reliable than a single-bus power supply mode.

[0017] The present invention uses a three-phase coordination mode of a power supply side circuit and a busbar formed by a side power switch, which can meet the needs of maintenance, replacement, etc. and handle line switch failures without power outages.

[0018] The present invention increases the function of a tie line, and can provide power to power users even when two transformers in a substation fail at the same time.

[0019] The present invention can provide power to all or part of the power users in time when multiple devices in the substation fail at the same time, so as to quickly restore power supply to important power users. It can also share the power of two transformers in the substation, extend the service life of the transformers, and prevent the transformers from being overloaded and causing equipment damage or power supply failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is an electrical schematic diagram of the transformer of the present invention; Figure 2 is an electrical schematic diagram of the power switch of the present invention; Figure 3 is the system wiring diagram of the present invention; Figure 4 It is a system wiring diagram of the present invention connected to an adjacent substation; Figure 5 It is the system wiring diagram of the present invention and normal operation; Figure 6 It is a wiring diagram of a power supply system for restoring power supply when a transformer-control switch of the present invention fails; Figure 7 It is a wiring diagram of the power supply system for restoring power supply when the first line control switch of the present invention fails; Figure 8 It is a wiring diagram of the power supply system for restoring power supply when the first bus fails in the present invention; Fig. 9 It is another wiring diagram of the power supply system for restoring power supply when the first bus fails according to the present invention; Fig.10 It is a wiring diagram of the power supply system for restoring the power supply when the first busbar and the second busbar fail at the same time; Fig.11 It is a wiring diagram of a power supply system for restoring power supply when the first busbar, the second busbar, the first transformer and the second transformer of the present invention fail at the same time. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0023] Refer to the following Figure 1-Figure 11 The technical solutions of some embodiments of the present invention are described.

[0024] Example 1

[0025] The present invention provides an embodiment, which is a system for quickly restoring power supply in a fault state, such as Figure 1 As shown, Figure 1 It is the electrical principle diagram of the transformer of the present invention.

[0026] The present invention relates to a system for quickly restoring power supply in a fault state, comprising: In the substation, the first transformer and the second transformer are used to convert high voltage into low voltage. One end of the first transformer connected to the power supply is the high voltage input end of the transformer 1, and the other end of the first transformer connected to the power supply is the low voltage output end of the transformer 1; one end of the second transformer connected to the power supply is the high voltage input end of the transformer, and the other end of the second transformer connected to the power supply is the low voltage output end of the transformer.

[0027] The first transformer and the second transformer are of the same model, the voltage value connected to the high-voltage side input terminal of the first transformer and the high-voltage side input terminal of the second transformer are the same, and the voltage value output by the low-voltage side output terminal of the first transformer and the low-voltage side output terminal of the second transformer are the same.

[0028] like Figure 2 As shown, Figure 2 This is the electrical schematic diagram of the power switch of the present invention. The power switch is used to control the connection or disconnection of the power supply. It has two states: open and closed. In the open state, both sides of the power switch are not conductive, and in the closed state, both sides of the power switch are conductive. According to the direction of the power supply and the load, one end of the power switch is defined as the power side, and the other end is defined as the load side. The power switch includes the first transformer power switch, denoted as BYQ1; the second transformer power switch, denoted as BYQ2; the line power switch, denoted as XL; the side power switch, denoted as CL; the busbar power switch, denoted as ML; the tie line power switch, denoted as LLX; like Figure 3 As shown, Figure 3 This is the system wiring diagram of the present invention. The first busbar, the second busbar and the third busbar are used for power distribution. The first busbar, the second busbar and the third busbar are conductive copper rods configured according to the required specifications. In the figure, the tie line switch XL1-3' of the second substation is the same type of line switch of another substation.

[0029] Use the load side line to connect the electricity users. According to the direction of the power source and the load, one end of the load side line is defined as the power side, and the other end is defined as the load side. Each load side line connects one electricity user. The load side line is a conductive cable configured according to the required specifications.

[0030] The first transformer power switch includes BYQ1-1, BYQ1-2, BYQ1-3, and BYQ1-4. The load sides of the first transformer power switch BYQ1-1 and the first transformer power switch BYQ1-2 are connected, and then connected to the power side of the first transformer power switch BYQ1-3. The power side of the first transformer power switch BYQ1-1 is connected to any point of the first bus, and the power side of the first transformer power switch BYQ1-2 is connected to any point of the second bus. The load side of the first transformer power switch BYQ1-3 is simultaneously connected to the low voltage side of the first transformer and the power side of the first transformer power switch BYQ1-4, and the load side of the first transformer power switch BYQ1-4 is connected to any point on the third bus.

[0031] The second transformer power switch BYQ2 is configured according to the configuration method of the first transformer power switch, including the second transformer power switches BYQ2-1, BYQ2-2, BYQ2-3, and BYQ2-4. The load sides of the second transformer power switches BYQ2-1 and BYQ2-2 are connected, and then connected to the power side of the second transformer power switch BYQ2-3. The power side of the second transformer power switch BYQ2-1 is connected to any point of the first bus, and the power side of the second transformer power switch BYQ2-2 is connected to any point of the second bus. The load side of the second transformer power switch BYQ2-3 is simultaneously connected to the low-voltage side of the second transformer and the power side of the second transformer power switch BYQ2-4, and the load side of the second transformer power switch BYQ2-4 is connected to any point on the third bus.

[0032] The line power switch XL, as shown in the figure, includes XL1-1, XL1-2, XL1-3, and XL1-4, and the first line power switch includes XL1-1, XL1-2, XL1-3, and XL1-4. The load sides of the first line power switches XL1-1 and XL1-2 are connected, and after the load sides of the first line power switches XL1-1 and XL1-2 are connected, they are connected to the power side of the first line power switch XL1-3. The power side of the first line power switch XL1-1 is connected to any point of the first bus, and the power side of the first line power switch XL1-2 is connected to any point of the second bus. The load side of the first line power switch XL1-3 is simultaneously connected to the power side of the first load line and the power side of the line power switch XL1-4, the load side of the first load line is connected to the first power user, and the load side of the first line power switch XL1-4 is connected to any point on the third bus. Among them, the load line 1 is set on the upper side of the power user 1.

[0033] The 2nd line power switch to the 4th line power switch are configured according to the configuration method of the 1st line power switch, including the 2nd to 4th line power switches XL2-1, XL2-2, XL2-3, XL2-4...XL4-1, XL4-2, XL4-3, XL4-4.

[0034] The side power switch CL includes CL1-1, CL1-2, CL1-3, and CL1-4. The load sides of the side power switch CL1-1 and the side power switch CL1-2 are connected, and after the load sides of the side power switch CL1-1 and the side power switch CL1-2 are connected, they are connected to the power side of the side power switch CL1-3. The power side of the side power switch CL1-1 is connected to any point of the first bus, and the power side of the side power switch CL1-2 is connected to any point of the second bus. The load side of the side power switch CL1-3 is connected to the power side of the side power switch CL1-4, and the load side of the side power switch CL1-4 is connected to any point on the third bus.

[0035] The bus tie power switch ML is ML1-1, and the power side of the bus tie power switch ML1-1 is connected to any point of the first bus, and the load side of the bus tie power switch ML1-1 is connected to any point of the second bus.

[0036] The tie-line power switch LLX includes: tie-line power switches LLX1-1, LLX1-2, LLX1-3, and LLX1-4. The load sides of the tie-line power switch LLX1-1 and the tie-line power switch LLX1-2 are connected, and after the load sides of the side tie-line power switch LLX1-1 and the side tie-line power switch LLX1-2 are connected, they are connected to the power side of the tie-line power switch LLX1-3. The power side of LLX1-1 is connected to any point on the first bus, and the power side of the tie-line power switch LLX1-2 is connected to any point on the second bus. The load side of the tie-line power switch LLX1-3 is simultaneously connected to the load side of the tie-line power switch LLX1-3' of the second substation and the power side of the tie-line power switch LLX1-4, and the load side of the tie-line power switch LLX1-4 is connected to any point on the third bus. The second substation is a substation adjacent to the first substation, and has the same configuration as the first substation, such as Figure 4 As shown, Figure 4 It is a system wiring diagram of the present invention connected with an adjacent substation.

[0037] Example 2

[0038] The present invention further provides an embodiment, which is a method for quickly restoring power supply under a fault state, which is implemented using the system for quickly restoring power supply under a fault state described in Example 1.

[0039] The method for quickly restoring power supply under a fault state comprises the following steps: When the substation operates normally, the 1st transformer power switch BYQ1-1 and the 2nd transformer power switch BYQ2-2 are in the closed state. At this time, the 1st line power switch XL1-1 and the 3rd line power switch XL3-1 are closed line power switches, the 2nd line power switch XL2-2 and the 4th line power switch XL4-2 are closed, the 1st line power switch XL1-3, the 2nd line power switch XL2-3 ... the 4th line power switch XL4-3 are closed, the 1st line power switch XL1-4, the 2nd line power switch XL2-4 ... the 4th line power switch XL4-4 are closed, and the remaining power switches are in the open state. At this time, the 1st electricity user, the 2nd electricity user ... the 4th electricity user are powered normally, such as Figure 5 As shown, Figure 5 This is the system wiring diagram of the present invention and normal operation. In the figure, the tie line switch XL1-3' of the second substation represents the same type of line switch of another substation.

[0040] Example 3

[0041] The present invention further provides an embodiment, which is a method for quickly restoring power supply under a fault state, which is implemented using the system for quickly restoring power supply under a fault state described in Example 1.

[0042] The method for quickly restoring power supply under a fault state comprises the following steps: When the transformer control switch fails, for example, the first transformer power switch BYQ1-1 or the first transformer power switch BYQ1-3 fails and is forced to open, the first and third power users will stop supplying power. If the busbar power switch ML1-1 is changed to the closed state, the first and third power users will resume power supply. Figure 6 As shown, Figure 6 This is a wiring diagram for restoring a power supply system when the first transformer control switch of the present invention fails.

[0043] Example 4

[0044] The present invention further provides an embodiment, which is a method for quickly restoring power supply under a fault state, which is implemented using the system for quickly restoring power supply under a fault state described in Example 1.

[0045] The method for quickly restoring power supply under a fault state comprises the following steps: When the line control switch fails, for example, the line power switch XL1-1 or the line power switch XL1-3 fails and is forced to open, the power supply to the first power user stops. If the line power switch XL1-4, the side power switch CL1-1, the side power switch CL1-3, and the side power switch CL1-4 are turned into the closed state, the power supply to the first power user is restored. Figure 7 As shown, Figure 7 This is a wiring diagram of the power supply system when the first line control switch of the present invention fails. In the figure, the tie line switch XL1-3' of the second substation represents the same type of line switch of another substation.

[0046] Example 5

[0047] The present invention further provides an embodiment, which is a method for quickly restoring power supply under a fault state, which is implemented using the system for quickly restoring power supply under a fault state described in Example 1.

[0048] The method for quickly restoring power supply under a fault state comprises the following steps: When a busbar fails, for example, the first busbar fails and is forced to stop operation, the first and third power users will stop supplying power. If the side power switches CL1-2, CL1-3, and CL1-4 are switched on, and the line power switches XL1-4 and XL3-4 are switched on, the first and third power users will resume supplying power. Figure 8 As shown, Figure 8 This is the wiring diagram of the power supply system for restoring power supply when the first bus fails in the present invention. Or, for example, the first bus fails and is forced to stop operation. At this time, the first power user, the third power user...the n-1th power user stop supplying power. If the line power switches XL1-1, XL3-1...XL(n-1)-1 are changed to the closed state, the first power user and the third power user resume power supply. Fig. 9 As shown, Fig. 9 This is another wiring diagram for restoring the power supply system when the first bus fails according to the present invention.

[0049] Example 6

[0050] The present invention further provides an embodiment, which is a method for quickly restoring power supply under a fault state, which is implemented using the system for quickly restoring power supply under a fault state described in Example 1.

[0051] The method for quickly restoring power supply under a fault state comprises the following steps: When two busbars fail at the same time, the first transformer power switch BYQ1-1, the first transformer power switch BYQ1-3, the second transformer power switch BYQ2-1, and the second transformer power switch BYQ2-3 are in the open state, and the first power user, the second power user ... the fourth power user are cut off from power supply. If the first transformer power switch BYQ1-4 is turned to the closed state, and the line power switches XL1-4, XL2-4 ... XL4-4 are turned to the closed state, the first power user, the second power user ... the fourth power user will resume power supply. Fig.10 As shown, Fig.10 This is a wiring diagram of a power supply system for restoring power when the first bus and the second bus fail at the same time according to the present invention.

[0052] Example 7

[0053] The present invention further provides an embodiment, which is a method for quickly restoring power supply under a fault state, which is implemented using the system for quickly restoring power supply under a fault state described in Example 1.

[0054] The method for quickly restoring power supply under a fault state comprises the following steps: When the 1st bus, the 2nd bus, the 1st transformer, and the 2nd transformer fail at the same time, the 1st electricity user, the 2nd electricity user, ... the 4th electricity user will stop supplying power. If the tie line power switch LLX1-4 is turned on, the line power switch XL1-4, the line power switch XL2-4 ... the line power switch XL4-4 are turned on, then the 1st electricity user, the 2nd electricity user ... the 4th electricity user will resume supplying power. Fig.11 As shown, Fig.11 It is a wiring diagram of a power supply system for restoring power supply when the first busbar, the second busbar, the first transformer and the second transformer of the present invention fail at the same time.

[0055] In the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The terms "connected" and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0057] In the description of this specification, the description of the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A system for quickly restoring power supply in a fault state, characterized in that: In the substation, high voltage is converted into low voltage through the first transformer and the second transformer, wherein one end of the first transformer connected to the power supply is the high voltage side input end of the transformer 1, and the other side of the first transformer connected to the power supply is the low voltage side output end of the transformer 1; one end of the second transformer connected to the power supply side is the high voltage side input end of the transformer, and the other side of the second transformer connected to the power supply side is the low voltage side output end of the transformer; the voltage value connected to the high voltage side input end of the first transformer and the high voltage side input end of the second transformer is the same, and the voltage value output by the low voltage side output end of the first transformer and the low voltage side output end of the second transformer is the same; the power switch controls the connection or disconnection of the power supply, the load side line is connected to the electricity user, one end of the load side line is the power supply side, and the other end of the load side line is the load side, and each load side line is connected to one electricity user.

2. A system for rapidly restoring power supply in a fault state according to claim 1, characterized in that: The power switch includes two states: open and closed. In the open state, both sides of the power switch are not conductive, and in the closed state, both sides of the power switch are conductive. One end of the power switch is the power side, and the other end of the power switch is the load side. The power switch includes a first transformer power switch BYQ1, a second transformer power switch BYQ2, a line power switch XL, a side power switch CL, a busbar power switch ML, and a tie line power switch LLX.

3. A system for rapidly restoring power supply in a fault state according to claim 2, characterized in that: The first transformer power switch BYQ1 includes: BYQ1-1, BYQ1-2, BYQ1-3, BYQ1-4; the first transformer power switch BYQ1-1 is connected to the load side of the first transformer power switch BYQ1-2, and then the load side of the first transformer power switch BYQ1-2 is connected to the power side of the first transformer power switch BYQ1-3, and the power side of the first transformer power switch BYQ1-1 is connected to any point of the first busbar. The power supply side of the power switch BYQ1-2 is connected to any point of the second bus; the load side of the first transformer power switch BYQ1-3 is simultaneously connected to the low voltage side of the first transformer and the power supply side of the first transformer power switch BYQ1-4, and the load side of the first transformer power switch BYQ1-4 is connected to any point on the third bus; the second transformer power switch BYQ2 includes: second transformer power switches BYQ2-1, BYQ2-2, BYQ2-3, BYQ2-4; The load sides of the second transformer power switch BYQ2-1 and the second transformer power switch BYQ2-2 are connected, and then connected to the power side of the second transformer power switch BYQ2-3. The power side of the second transformer power switch BYQ2-1 is connected to any point of the first bus, and the power side of the second transformer power switch BYQ2-2 is connected to any point of the second bus; the load side of the second transformer power switch BYQ2-3 is simultaneously connected to the low-voltage side of the second transformer and the power side of the second transformer power switch BYQ2-4, and the load side of the second transformer power switch BYQ2-4 is connected to any point on the third bus.

4. A system for rapidly restoring power supply in a fault state according to claim 1, characterized in that: The line power switch XL includes: a first line power switch, a second line power switch, a third line power switch and a fourth line power switch; the first line power switch includes XL1-1, XL1-2, XL1-3 and XL1-4, the load sides of the first line power switches XL1-1 and XL1-2 are connected, and then connected to the power side of the first line power switch XL1-3, the power side of the first line power switch XL1-1 is connected to any point of the first bus, and the power side of the first line power switch XL1-2 is connected to any point of the second bus Pay attention to one point; the load side of the 1st line power switch XL1-3 is connected to the power side of the 1st load line and the power side of the line power switch XL1-4 at the same time, the load side of the 1st load line is connected to the 1st electricity user, and the load side of the 1st line power switch XL1-4 is connected to any point on the 3rd bus; the 2nd line power switch - the 4th line power switch include: the 2nd line power switch XL2-1, XL2-2, XL2-3, XL2-4 - the 4th line power switch XL4-1, XL4-2, XL4-3, XL4-4.

5. The system for rapidly restoring power supply in a fault state according to claim 2, characterized in that: The side power switch CL includes: CL1-1, CL1-2, CL1-3, and CL1-4. The load sides of the side power switch CL1-1 and the side power switch CL1-2 are connected, and then connected to the power side of the side power switch CL1-3. The power side of the side power switch CL1-1 is connected to any point of the first bus, and the power side of the side power switch CL1-2 is connected to any point of the second bus; the load side of the side power switch CL1-3 is connected to the power side of the side power switch CL1-4, and the load side of the side power switch CL1-4 is connected to any point on the third bus.

6. A system for rapidly restoring power supply in a fault state according to claim 2, characterized in that: The bus tie power switch ML is ML1-1, the power side of the bus tie power switch ML1-1 is connected to any point of the first bus, and the load side of the bus tie power switch ML1-1 is connected to any point of the second bus; the tie line power switch LLX includes: tie line power switches LLX1-1, LLX1-2, LLX1-3, and LLX1-4, the tie line power switch LLX1-1 and the load side of the tie line power switch LLX1-2 are connected, and then connected to the power side of the tie line power switch LLX1-3, the power side of LLX1-1 is connected to any point on the first bus, and the power side of the tie line power switch LLX1-2 is connected to any point on the second bus; the load side of the tie line power switch LLX1-3 is simultaneously connected to the load side of the tie line power switch LLX1-3' of the second substation and the power side of the tie line power switch LLX1-4, and the load side of the tie line power switch LLX1-4 is connected to any point on the third bus.

7. A method for quickly restoring power supply under a fault condition, characterized by: The system for quickly restoring power supply under fault conditions as described in claims 1 to 6 is used for implementation; when the substation operates normally, the first transformer power switch BYQ1-1 and the second transformer power switch BYQ2-2 are in a closed state, at which time the first line power switch XL1-1 and the third line power switch XL3-1 are closed state line power switches, the second line power switch XL2-2 and the fourth line power switch XL4-2 are closed state, the first line power switch XL1-3, the second line power switch XL2-3 ... the fourth line power switch XL4-3 are closed state, the first line power switch XL1-4, the second line power switch XL2-4 ... the fourth line power switch XL4-4 are closed state, and the remaining power switches are in an open state, at which time the first power user, the second power user ... the fourth power user are powered normally.

8. A method for quickly restoring power supply under a fault condition according to claim 7, characterized in that: When the transformer control switch fails, the first transformer power switch BYQ1-1 or the first transformer power switch BYQ1-3 fails to be in the open state, and the first power user and the third power user are stopped from supplying power; when the main power switch ML1-1 is in the closed state, the first power user and the third power user are restored to power supply.

9. A method for quickly restoring power supply under a fault condition according to claim 7, characterized in that: When the line control switch fails, the line power switch XL1-1 or the line power switch XL1-3 is in the open state, and the power supply to the first electricity user is stopped; when the line power switch XL1-4, the side power switch CL1-1, the side power switch CL1-3, and the side power switch CL1-4 are in the closed state, the power supply to the first electricity user is restored.

10. The method for quickly restoring power supply under a fault condition according to claim 7, characterized in that: When the bus fails, the first bus fails and stops running, and the first and third power users stop supplying power; when the side power switch CL1-2, the side power switch CL1-3, and the side power switch CL1-4 are in the closed state, and the line power switches XL1-4 and XL3-4 are in the closed state, the first and third power users resume supplying power; When two busbars fail at the same time, the first transformer power switch BYQ1-1, the first transformer power switch BYQ1-3, the second transformer power switch BYQ2-1, and the second transformer power switch BYQ2-3 are in the open state, and the first power user, the second power user ... the fourth power user are in the power supply stop state; when the first transformer power switch BYQ1-4 is in the closed state, the line power switches XL1-4, XL2-4 ... XL4-4 are in the closed state, and the first power user, the second power user ... the fourth power user are restored to power supply; When the 1st bus, the 2nd bus, the 1st transformer and the 2nd transformer fail at the same time, power supply to the 1st electricity user, the 2nd electricity user ... the 4th electricity user is stopped; when the interconnection line power switch LLX1-4 is in the closed state, the line power switch XL1-4, the line power switch XL2-4 ... the line power switch XL4-4 are in the closed state, then power supply to the 1st electricity user, the 2nd electricity user ... the 4th electricity user is restored.

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