A same-tower double-loop overhead power distribution network framework reconstruction system

Abstract

A kind of overhead distribution network grid reconstruction system of same-tower double circuit, including same-tower erected transformer substation first outgoing line and transformer substation second outgoing line, and the main line and branch line of transformer substation first outgoing line and transformer substation second outgoing line are included;The main line of transformer substation first outgoing line and transformer substation second outgoing line is connected by tie-in switch and forms loop network open loop operation;At least one group of two-in-one-out switch is provided between the main line of transformer substation first outgoing line and transformer substation second outgoing line, and the main line of transformer substation first outgoing line and transformer substation second outgoing line is used as the incoming line end of two-in-one-out switch, and the outgoing line end of two-in-one-out switch is connected to load, to realize that two groups of different power supply lines supply power to load.The utility model forms hand in hand power supply by tie-in switch, when distribution line fails, automatically isolates fault area and recovers non-fault area power supply, and by two-in-one-out switch, load is transferred to opposite power supply line, to improve power supply reliability.

Description

Technical Field

[0001] This utility model relates to the field of power grid technology, specifically to a reconfiguration system for a double-circuit overhead distribution network on the same tower. Background Technology

[0002] my country's rural power grids are mostly radial overhead networks. Each radial overhead feeder uses a single transformer and a single busbar from a single substation as its power source, and the feeders are distributed in a tree-like pattern after originating from the substation. Due to the low substation density and the predominantly radial wiring, it is difficult to form a ring network structure, making automation impossible and resulting in low power supply reliability in rural areas. Applying the high-density substations and dual-power single-ring network schemes of urban power grids to rural power grids—that is, building new substations and erecting new lines to connect with the existing lines of old substations—incurs significant limitations due to high capital investment, long construction periods, and low economic efficiency. Existing technologies include overhead distribution network reconfiguration systems, but their automation level is insufficient, and power supply reliability still needs improvement. Utility Model Content

[0003] This invention addresses the aforementioned technical problems by providing a reconfigurable double-circuit overhead power distribution network system on the same tower. The system includes a first outgoing line and a second outgoing line from a substation, both erected on the same tower. Each outgoing line comprises a main line and branch lines. The main lines of the first and second outgoing lines are connected via a tie switch to form an open-loop network. At least one set of two-in-one-out switches is installed between the main lines of the first and second outgoing lines. The main lines of the first and second outgoing lines serve as the incoming terminals of the two-in-one-out switches, while the outgoing terminals are connected to the loads, enabling power supply to the loads from two different power lines. This invention establishes a daisy-chain power supply system via the tie switch. In the event of a power line fault, the faulty area is automatically isolated, and power is restored to the non-faulty area. Furthermore, the load is transferred to the opposite power line via the two-in-one-out switches, improving power supply reliability.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0005] In a first aspect, this utility model provides a reconfiguration system for a double-circuit overhead power distribution network on the same tower, including a first outgoing line and a second outgoing line of a substation erected on the same tower. Both the first outgoing line and the second outgoing line include a main line and branch lines. The main lines of the first outgoing line and the second outgoing line are connected by a tie switch to form an open-loop ring network. At least one set of two-in-one-out switches is provided between the main lines of the first outgoing line and the second outgoing line. The main lines of the first outgoing line and the second outgoing line serve as the incoming terminals of the two-in-one-out switches, and the outgoing terminals of the two-in-one-out switches are connected to the load, so as to realize that the load is powered by two different power supply lines.

[0006] On the other hand, the first outgoing line and the second outgoing line of the substation are two sets of outgoing lines of the same switch, or two sets of outgoing lines of different switches on the same busbar, or two sets of outgoing lines of different switches on different busbars.

[0007] On the other hand, it includes a control device, which is connected to both the tie switch and the two-in-one-out switch. The control device is used to control the switches on both sides of the fault to automatically trip to isolate the fault when a fault is detected at any point on the main line of the first outgoing line and the second outgoing line of the substation, and to control the tie switch to operate to restore power supply to the non-faulty area.

[0008] On the other hand, the control device is also used to control the two-in-one-out switch to transfer the load in the fault area to the normally operating power supply line when a fault is detected at any point of the main line of the first outgoing line and the second outgoing line of the substation, so as to ensure normal power supply to the load end.

[0009] On the other hand, multiple sectionalizing switches are installed on the main lines of the first outgoing line and the second outgoing line of the substation, and each of the sectionalizing switches is communicatively connected to the control device.

[0010] On the other hand, each of the segmented switches is connected to the control device via 4G, 5G, carrier wave or optical fiber.

[0011] On the other hand, the first outgoing line and the second outgoing line of the substation, which are erected on the same tower, are arranged horizontally or vertically on the tower or pole.

[0012] The overhead power distribution network reconfiguration system with two circuits on the same tower provided in this embodiment connects the main lines of the first and second outgoing lines of the substation via a tie switch, forming an open-loop ring network. At least one set of two-in-one-out switches is installed between the main lines of the first and second outgoing lines, with the main lines serving as the incoming terminals of the two-in-one-out switches. The outgoing terminals of the two-in-one-out switches are connected to the load, enabling power supply to the load from two different power lines. This invention forms a tandem power supply through the tie switch, automatically isolating the faulty area and restoring power to the non-faulty area in the event of a distribution line fault. Furthermore, the load is transferred to the opposite power line via the two-in-one-out switches, improving power supply reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the reconfiguration system of the double-circuit overhead power distribution network on the same tower according to this utility model; Figure 2 This is another structural schematic diagram of the reconfiguration system of the double-circuit overhead power distribution network on the same tower according to this utility model. Detailed Implementation

[0014] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0015] like Figure 1-2 The illustrated double-circuit overhead power distribution network reconfiguration system includes a first outgoing line and a second outgoing line of a substation, both erected on the same tower. Each outgoing line comprises a main line and branch lines. The main lines of the first and second outgoing lines are connected by a tie switch to form an open-loop network. At least one set of two-in-one-out switches is installed between the main lines of the first and second outgoing lines. The main lines of the first and second outgoing lines serve as the incoming terminals of the two-in-one-out switches, and the outgoing terminals of the switches are connected to the loads, enabling power supply to the loads from two different power lines. Specifically, the tie switch is located at the end connection point of the main lines of the first and second outgoing lines.

[0016] In some embodiments, the first outgoing line and the second outgoing line of the substation are two sets of outgoing lines of the same switch, or two sets of outgoing lines of different switches on the same busbar, or two sets of outgoing lines of different switches on different busbars.

[0017] In some embodiments, a control device is included, which is controlled to connect to both the tie switch and the two-in-one-out switch. The control device is used to control the switches on both sides of the fault to automatically trip to isolate the fault when a fault is detected at any point on the main line of the first outgoing line and the second outgoing line of the substation, and to control the tie switch to operate to restore power supply to the non-faulty area.

[0018] Furthermore, the control device is a phase current grounding protection intelligent distributed feeder automation device, and the control device includes a communication module, which is communicatively connected to the tie switch and the two-in-one-out switch.

[0019] In some embodiments, the control device is further configured to control the two-in-one-out switch to operate when a fault (short circuit, grounding, open circuit) is detected at any point on the main line of the first outgoing line and the second outgoing line of the substation, so as to transfer the load in the fault area to the normally operating power supply line, so as to enable the load end to be powered normally.

[0020] In some embodiments, multiple sectionalizing switches are installed on the main lines of the first and second outgoing lines of the substation, and each sectionalizing switch is communicatively connected to the control device. By adding sectionalizing switches to the existing distribution lines, such as changing from 3 sections to 4 or 5 sections, and cooperating with the intelligent distributed feeder automation system for phase current grounding protection, the scope of power outages due to faults can be greatly reduced. For example, when a ground fault occurs, grounding current signals can be detected at multiple sectionalizing switches. By comparing the time when multiple sectionalizing switches detect grounding current signals, the control system can quickly identify the specific ground fault between the poles where the two sectionalizing switches are located. Subsequently, the control system controls the two sectionalizing switches in the fault area to disconnect from the power supply line. Thus, when a fault occurs, the system can quickly locate the fault point and isolate the faulty part through devices such as phase current switching switches, preventing the fault from expanding and affecting the entire power grid. That is, when a distribution line fault occurs in the system, only the faulty area is cut off, without the need to transfer the entire line to another line, without the need for the substation to consider line capacity redundancy (N-1), only the downstream power supply needs to be transferred, improving the utilization rate of the substation's main transformer capacity.

[0021] Meanwhile, after isolating the faulty section, the system also possesses self-healing capabilities, automatically adjusting the operation mode of other lines to compensate for the power supply gap caused by the fault and ensure continuous power supply to the grid. Specifically, the system also forms a daisy-chain power supply mode through tie switches. When a short circuit, grounding, or open-circuit fault occurs at any point on the main line, the switches on both sides of the fault automatically trip to isolate the fault, and power supply to the non-faulty area is restored through the tie switches.

[0022] Furthermore, the system connects multiple two-in-one-out switches to the load on the main line, enabling power supply to the load from two different power lines. When the system restores power to the non-faulty area via the tie switch, users (loads) in the faulty area are transferred to the normally operating opposite power line via the two-in-one-out switch, thus ensuring power supply reliability.

[0023] Furthermore, the multiple sectionalizing switches on the main lines of the first and second outgoing lines of the substation, with each pair of sectionalizing switches controlling an area that determines the scope of the power outage after a fault; all sectionalizing switches on the main line of the first outgoing line of the substation are communicatively connected; all sectionalizing switches on the main line of the second outgoing line of the substation are communicatively connected; and all sectionalizing switches on the main line of the first outgoing line of the substation and all sectionalizing switches on the main line of the second outgoing line of the substation are communicatively connected.

[0024] In some embodiments, each of the sectionalizing switches and the control device are connected via 4G, 5G, carrier wave, or fiber optic communication. By utilizing various modern communication methods to achieve automated control of distributed feeder phase current, the difficulty of upgrading the power grid, especially in rural areas, is greatly reduced, and the automation upgrade of the distribution network is accelerated efficiently.

[0025] In some embodiments, each sectionalizing switch on the main line of the first outgoing line of the substation and each sectionalizing switch on the main line of the second outgoing line of the substation are communicatively connected to the tie switch.

[0026] In some embodiments, the first outgoing line and the second outgoing line of the substation, which are erected on the same tower, are arranged horizontally or vertically on the tower or pole. By erecting them on the same tower, there is no need to construct towers and poles repeatedly, reducing the capital investment in the project, shortening the construction period, and achieving high economic benefits.

[0027] This utility model discloses a reconfiguration system for a double-circuit overhead power distribution network on the same tower. It includes a first outgoing line and a second outgoing line from a substation, both erected on the same tower. Each outgoing line comprises a main line and branch lines. The main lines of the first and second outgoing lines are connected via tie switches to form an open-loop network. At least one set of two-in-one-out switches is installed between the main lines of the first and second outgoing lines. The main lines of the first and second outgoing lines serve as the two incoming lines of the two-in-one-out switches, and the outgoing lines of these switches are connected to the loads, enabling power supply to the loads from two different power lines. This utility model's overhead lines form a daisy-chain power supply system via tie switches. In the event of a power line fault, the faulty area is automatically isolated, and power supply to the non-faulty area is promptly restored. Simultaneously, the two-in-one-out switches transfer load users to the opposite power line, improving power supply reliability.

[0028] The above-described embodiments are merely examples of several implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting this utility model. It should be noted that, for those skilled in the art, various modifications and improvements can be made within the spirit and principles of this utility model without departing from its concept. Any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of this utility model.

Claims

1. A reconfiguration system for a double-circuit overhead power distribution network on the same tower, characterized in that: The system includes a first outgoing line and a second outgoing line of the substation, both erected on the same tower. Each of the first and second outgoing lines includes a main line and a branch line. The main lines of the first and second outgoing lines are connected by a tie switch to form an open-loop ring network. At least one set of two-in-one-out switches is provided between the main lines of the first and second outgoing lines. The main lines of the first and second outgoing lines serve as the incoming terminals of the two-in-one-out switches, and the outgoing terminals of the two-in-one-out switches are connected to the load, so that the load is powered by two different power supply lines.

2. The reconfiguration system for a double-circuit overhead power distribution network on the same tower according to claim 1, characterized in that: The first outgoing line and the second outgoing line of the substation are two sets of outgoing lines from the same switch, or two sets of outgoing lines from different switches on the same busbar, or two sets of outgoing lines from different switches on different busbars.

3. The reconfiguration system for a double-circuit overhead power distribution network on the same tower according to claim 1, characterized in that: The system includes a control device, which is connected to both the tie switch and the two-in-one-out switch. The control device is used to automatically trip the switches on both sides of the fault to isolate the fault when a fault is detected at any point on the main line of the first outgoing line and the second outgoing line of the substation, and to control the tie switch to restore power supply to the non-faulty area.

4. The reconfiguration system for a double-circuit overhead power distribution network on the same tower according to claim 3, characterized in that: The control device is also used to control the two-in-one-out switch to transfer the load in the fault area to the normally operating power supply line when a fault is detected at any point on the main line of the first outgoing line and the second outgoing line of the substation, so as to ensure normal power supply to the load end.

5. The reconfiguration system for a double-circuit overhead power distribution network on the same tower according to claim 3, characterized in that: Multiple sectionalizing switches are installed on the main lines of the first and second outgoing lines of the substation, and each of the sectionalizing switches is communicatively connected to the control device.

6. The reconfiguration system for a double-circuit overhead power distribution network on the same tower according to claim 5, characterized in that: Each of the segmented switches is connected to the control device via 4G, 5G, carrier wave, or optical fiber.

7. The reconfiguration system for a double-circuit overhead power distribution network on the same tower according to claim 1, characterized in that: The first outgoing line and the second outgoing line of the substation, which are erected on the same tower, are arranged horizontally or vertically on the tower or pole.

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