Transformer area maintenance interconnection-to-power supply conversion device and method

Abstract

The invention relates to the field of power supply and distribution, discloses an interconnection-to-power supply device and method for transformer area maintenance, and solves the problems of large workload, high cost, long power failure time and the like due to the fact that a mobile power supply guarantee vehicle is needed for transformer area maintenance. The operation module is used for sending an operation instruction for the interconnection circuit breaker and controlling the interconnection circuit breaker to act; the interconnection circuit breaker is used for switching on or switching off in response to the control instruction of the operation module, and controlling a circuit between the low-voltage sides of the two transformer areas to be switched on or switched off; the current and voltage acquisition module is used for acquiring current and voltage of the low-voltage side of the transformer area; and the main control module is used for receiving the current and voltage of the low-voltage side of the transformer area acquired by the current and voltage acquisition module, receiving and identifying the operation instruction of the operation module, acquiring the state of the interconnected circuit breaker, judging the feasibility of the operation instruction according to all acquired data, and allowing the operation module to perform action control on the interconnected circuit breaker if the operation instruction is feasible.

Description

Technical Field

[0001] The present invention relates to the field of power supply and distribution, and more particularly to a device and method for interconnecting and transferring power supply for substation maintenance. Background Art

[0002] Power outages for maintenance are common during troubleshooting operations at low-voltage distribution transformer substations. To avoid prolonged power outages during maintenance, mobile power supply vehicles are often used to provide temporary power. Because manual wiring is required during the connection and disconnection of these temporary power lines, power outages of several minutes to over ten minutes can occur, impacting the normal power supply of dozens or even hundreds of households. Furthermore, traditional mobile power supply vehicles are limited by traffic conditions, making them difficult to reach in some narrow streets and remote areas, making them unable to provide timely power supply. Furthermore, because they typically use gasoline and diesel engines for power generation, they generate noise and exhaust emissions. Therefore, it is necessary to design a new maintenance tool and method based on the actual needs of transformer maintenance. Summary of the Invention

[0003] The purpose of the present invention is to provide a substation maintenance interconnection power supply device and method, which uses nearby non-maintenance substations to temporarily supply power to the loads in the substation that needs maintenance, thereby reducing maintenance workload and maintenance costs, shortening power outage time, and reducing exhaust and noise emissions to the surrounding environment.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: A substation maintenance interconnection power supply device, comprising: Power distribution cabinet, used to hold all power modules; An operation module, used to issue operation instructions to the interconnected circuit breaker and control the operation of the interconnected circuit breaker; The interconnected circuit breaker is used to close or open the circuit in response to the control instructions of the operation module, and control the conduction or disconnection of the circuit between the low-voltage sides of the two substations; Current and voltage acquisition module, used to collect current and voltage on the low-voltage side of the substation; The main control module is used to receive the low-voltage side current and voltage of the substation area collected by the current and voltage collection module, receive and identify the operation instructions of the operation module, obtain the status of the interconnected circuit breaker, and determine the feasibility of the operation instruction based on all the acquired data. If feasible, the operation module is allowed to control the operation of the interconnected circuit breaker; The power module is used to provide power to all power-consuming modules.

[0005] As a preferred technical solution of the present invention, the operation module includes an operation button, an operation circuit, a touch screen, a closing indicator light, and an opening indicator light; The operation button is used to issue an operation instruction; The operating circuit is used to control the opening and closing actions of the interconnected circuit breakers according to operating instructions.

[0006] The touch screen is used to input system instructions and display status.

[0007] As a preferred technical solution of the present invention, the interconnected power supply device further includes a communication interface for connecting to external devices and transmitting data; the main control module is electrically connected to the communication interface; The operating module also includes a gear knob, which includes a "local" gear and a "remote" gear. When the gear knob is in the "local" gear, the main control module performs logical execution based on the operating instructions issued by the operating button; when the gear knob is in the "remote" gear, the main control module performs logical execution based on the operating instructions transmitted by the communication interface.

[0008] As a preferred technical solution of the present invention, the interconnected power supply device is further provided with a smart meter and a signal sensing circuit, the signal sensing circuit is used to collect power supply data, and the smart meter is used to display the power supply data.

[0009] As a preferred technical solution of the present invention, the power distribution cabinet is equipped with a mounting component, and the mounting component includes an adjustable clamp or a cross-arm mounting piece.

[0010] As a preferred technical solution of the present invention, the power distribution cabinet is an outdoor waterproof power distribution cabinet.

[0011] A method for interconnecting and transferring power supply in substation maintenance includes the following steps: S1. Use cables or overhead lines to connect the two ends of the interconnected circuit breaker between the remote ends of the circuit breaker on the low-voltage side of the maintenance area and the remote ends of the circuit breaker on the low-voltage side of an adjacent area. When the area is operating normally, the interconnected circuit breaker is in the normally open disconnected state, and the circuit breaker on the low-voltage side of the area is in the normally closed connected state. S2. Disconnect the low-voltage side circuit breaker of the maintenance area and obtain the maintenance start instruction; S3. In response to the maintenance start instruction, the interconnected circuit breaker is controlled to be turned on, and the load on the low-voltage side of the maintenance area is supplied with power from the low-voltage side of the adjacent area; S4. In response to the maintenance end instruction, disconnect the interconnected circuit breaker; S5. After the interconnected circuit breaker is disconnected, the low-voltage side circuit breaker of the maintenance area is controlled to be connected to restore the normal power supply of the maintenance area.

[0012] As a preferred technical solution of the present invention, the interconnected circuit breaker is connected to the substation maintenance interconnected power supply device, and the control circuit of the substation maintenance interconnected power supply device is used to control the interconnected circuit breaker.

[0013] As a preferred technical solution of the present invention, in S2, the substation maintenance interconnection power supply device receives the maintenance start instruction, and after receiving the maintenance start instruction, initiates the device self-inspection. If the self-inspection is abnormal, an alarm message is displayed through the touch screen; if the self-inspection is normal, it is determined whether the safety interconnection conditions are met. If the safety interconnection conditions are met, the interconnection circuit breaker is controlled to be connected; if the interconnection conditions are not met, an alarm message is issued.

[0014] In S4, the substation maintenance interconnection power supply device receives the maintenance end instruction, and after receiving the maintenance end instruction, controls the interconnection circuit breaker to open.

[0015] As a preferred technical solution of the present invention, when the gear knob is in "local", the closing button is pressed to trigger; or when the gear knob is in "remote", the remote start command is received through the communication interface to trigger; The maintenance end instruction is triggered by: pressing the trip button, or receiving a remote end instruction through the communication interface.

[0016] In summary, the present invention has the following beneficial effects: the far ends (load sides) of the low-voltage side circuit breakers of two adjacent substations are connected by an interconnected circuit breaker; when there is no maintenance requirement, the low-voltage side circuit breaker of each substation is in a closed state, responsible for the normal power supply of the load in each substation; when one of the substations needs maintenance, the low-voltage side circuit breaker of the substation is disconnected, and the interconnected circuit breaker is closed, and the substation transformer on the non-maintenance side supplies power to the load in the maintenance side substation; when the maintenance is completed, the interconnected circuit breaker is first disconnected, and the substation circuit breaker on the maintenance side is closed to restore to the original normal power supply state.

[0017] Through the above scheme, it is possible to use adjacent substations to temporarily transfer power to the substation under maintenance, overcome the dependence of substation maintenance on mobile power supply guarantee vehicles, reduce the workload and operating costs of the maintenance substation, shorten the power outage time of substation maintenance, and avoid the impact of maintenance work on the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the composition and connection of the maintenance interconnection power supply device; Figure 2 It is the panel layout diagram for inspecting the interconnection power supply device; Figure 3 This is the layout diagram inside the cabinet for inspecting the interconnected power supply device; Figure 4 This is a schematic diagram of the internal power supply connection; Figure 5 This is a schematic diagram of internal communication connections.

[0019] In the figure: 1. Substation; 2. Substation low-voltage side circuit breaker; 3. Interconnected power supply device; 4. Interconnected circuit breaker; 5. Cable; 6. Distribution cabinet; 7. Touch screen; 8. Smart meter; 9. Closing indicator light; 10. Opening indicator light; 11. Shift knob; 12. Opening button; 13. Closing button; 14. Cabinet door; 15. Cabinet panel; 16. Power module; 16. Power module; 17. Current and voltage acquisition module; 18. Main control module. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-5 As shown, the present invention provides a substation maintenance interconnection power supply device, comprising: An operation module, used to issue operation instructions to the interconnected circuit breaker and control the operation of the interconnected circuit breaker; Specifically, the operation module includes operation buttons, operation circuits, touch screen, closing indicator light, opening indicator light, and gear knob; The operation button is used to trigger the operation command in the "local" gear state; The operating circuit is used to control the opening and closing of the interconnected circuit breakers according to the operating instructions.

[0022] The touch screen is used to input system commands and display status, and is also used to display data such as event records recorded in the device memory.

[0023] The gear knob has two positions: "local" and "remote." When the gear knob is in the "local" position, the main control module executes logic based on the operating instructions issued by the operating button. When the gear knob is in the "remote" position, the main control module executes logic based on the operating instructions transmitted by the communication interface. The gear knob is used to determine the control mode of the entire power supply device.

[0024] The indicator light is used to display the status of the interconnect circuit breaker when the device is in use. When the interconnect circuit breaker is closed, the closing indicator light is on; when the interconnect circuit breaker is open, the opening indicator light is on.

[0025] The interconnected circuit breaker is used to respond to the control instructions of the operation module to perform closing or opening operations to control the conduction or disconnection of the circuit between the low-voltage sides of the two substations; Current and voltage acquisition module, used to collect current and voltage on the low-voltage side of the substation; The main control module is used to receive the current and voltage on the low-voltage side of the substation collected by the current and voltage collection module, to receive and identify the operation instructions of the operation module, to obtain the status of the interconnected circuit breaker, and to judge the feasibility of the operation instruction based on all the acquired data. If feasible, the operation module is allowed to control the action of the interconnected circuit breaker.

[0026] The power module is used to provide power to all power-consuming modules and adopts dual power supply.

[0027] The communication interface is used to connect to external devices and transmit data, that is, to receive remote control signals; the main control module is electrically connected to the communication interface; The interconnected power supply device is also provided with a smart meter and a signal sensing circuit. The signal sensing circuit is used to collect power supply data, and the smart meter is used to display the power supply data.

[0028] The external structure of the interconnected power supply unit is equipped with a power distribution cabinet, which houses all power-consuming modules. The cabinet also has a door. When the door is opened, the touch screen, gear knob, buttons, and other operating modules on the cabinet panel can be directly operated. The cabinet is equipped with mounting components, including adjustable clamps and cross-arm mounting parts. The cabinet is outdoor waterproof.

[0029] Corresponding to the above-mentioned device, the present invention also provides a method for interconnecting and transferring power supply in substation maintenance, comprising the following steps: S1. Use cables or overhead lines to fix the two ends of the interconnected circuit breaker between the far end of the circuit breaker on the low-voltage side of the maintenance area and the far end of the circuit breaker on the low-voltage side of an adjacent area. When the area is operating normally, the interconnected circuit breaker is in the normally open disconnected state, and the circuit breaker on the low-voltage side of the area is in the normally closed connected state. The interconnected circuit breaker is connected to the maintenance interconnected power supply device of the area, and the control circuit of the maintenance interconnected power supply device of the area is used to control the interconnected circuit breaker.

[0030] This step is the preparation for the application of the interconnected power supply device. The interconnected circuit breaker is connected between the low-voltage sides of the two substations. At the same time, the interconnected power supply device and the remote control device are connected for communication, including establishing a good data transmission channel with the external control device through the communication interface, which can stably receive remote control instructions and ensure the normal operation of the entire interconnected power supply device.

[0031] S2. Manually or remotely disconnect the low-voltage circuit breaker in the maintenance area and obtain the maintenance start instruction; The maintenance start command is triggered by: when the gear knob is in the "local" position, that is, the staff manually rotates the gear knob to the "local" position and then manually presses the closing button; or when the gear knob is in the "remote" position, that is, the staff manually rotates the gear knob to the "remote" position, and the interconnected power supply device receives a remote start command through the communication interface. It should be noted that the maintenance start command is essentially a closing command for the interconnected circuit breakers.

[0032] In S2, in actual application, the cabinet door is opened, and the maintenance start instruction is received through the substation maintenance interconnection power supply device. After receiving the maintenance start instruction, the current and voltage parameters, closing / opening button status, gear knob status, circuit breaker status, and smart meter communication connection status are collected through the main control module, and the device self-test is initiated. The content of the self-test includes: detecting whether the main control module is normal, when the internal watchdog does not work, it is normal; detecting whether the current and voltage acquisition module is normal, when the current and voltage sampling values ​​are consistent with the data of the smart meter, it is normal; detecting whether the smart meter is normal, when the communication connection is not interrupted, it is normal.

[0033] If the self-test is abnormal, an alarm message will be displayed on the touch screen; if the self-test is normal, it will determine whether the safety interconnection conditions are met. The safety interconnection conditions include: the interconnected circuit breaker is in the open position, the maintenance side area has lost power, and the non-maintenance side power supply is normal; If the safety interconnection conditions are met, the steps in S3 can be automatically controlled to close the interconnected circuit breaker; if the interconnection conditions are not met, an alarm message is issued.

[0034] S3. In response to the maintenance start instruction, the interconnected circuit breaker is controlled to be turned on, and the load on the low-voltage side of the maintenance area is supplied with power from the low-voltage side of the adjacent area; S4. In response to the maintenance end instruction, disconnect the interconnected circuit breaker; Specifically, after the maintenance is completed, the substation maintenance interconnection power supply device receives the maintenance end instruction, and after receiving the maintenance end instruction, controls the interconnection circuit breaker to open.

[0035] The maintenance end command can be triggered by a worker manually pressing the trip button when the shift knob is in the "local" position, or by receiving a remote end command via the communication interface when the shift knob is in the "remote" position. The maintenance end command is essentially an opening command for the interconnected circuit breaker.

[0036] S5. After the interconnected circuit breaker is disconnected, manually or remotely control the low-voltage side circuit breaker of the maintenance area to be connected, restore the normal power supply of the maintenance area, and close the cabinet door of the interconnected power supply device to complete this maintenance operation.

[0037] The principle of the present invention is as follows: the far ends (load sides) of the low-voltage side circuit breakers of two adjacent substations are connected by an interconnected circuit breaker; when there is no maintenance requirement, the low-voltage side circuit breaker of each substation is in a closed state, responsible for the normal power supply of the load in each substation; when one of the substations needs maintenance, the low-voltage side circuit breaker of the substation is disconnected, and the interconnected circuit breaker is closed, and the substation transformer on the non-maintenance side supplies power to the load in the maintenance side substation; when the maintenance is completed, the interconnected circuit breaker is first disconnected, and the circuit breaker in the maintenance side substation is closed to restore to the original normal power supply state.

[0038] Through the above scheme, it is possible to use adjacent substations to temporarily transfer power to the substation under maintenance, overcome the dependence of substation maintenance on mobile power supply guarantee vehicles, reduce the workload and operating costs of the maintenance substation, shorten the power outage time of substation maintenance, and avoid the impact of maintenance work on the surrounding environment.

[0039] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A substation maintenance interconnection power supply device, characterized by comprising: Power distribution cabinet, used to hold all power modules; An operation module, used to issue operation instructions to the interconnected circuit breaker and control the operation of the interconnected circuit breaker; The interconnected circuit breaker is used to close or open the circuit in response to the control instructions of the operation module, and control the conduction or disconnection of the circuit between the low-voltage sides of the two substations; Current and voltage acquisition module, used to collect current and voltage on the low-voltage side of the substation; The main control module is used to receive the low-voltage side current and voltage of the substation area collected by the current and voltage collection module, receive and identify the operation instructions of the operation module, obtain the status of the interconnected circuit breaker, and determine the feasibility of the operation instruction based on all the acquired data. If feasible, the operation module is allowed to control the operation of the interconnected circuit breaker; The power module is used to provide power to all power-consuming modules.

2. The substation maintenance interconnection power supply device according to claim 1 is characterized by: The operation module includes an operation button, an operation circuit, a touch screen, a closing indicator light, and an opening indicator light; The operation button is used to issue an operation instruction; The operating circuit is used to control the opening and closing actions of the interconnected circuit breakers according to the operating instructions; The touch screen is used to input system instructions and display status.

3. The device for interconnecting and transferring power to a substation for maintenance according to claim 2 is characterized in that: The interconnected power supply device further includes a communication interface for connecting to external devices and transmitting data; the main control module is electrically connected to the communication interface; The operating module also includes a gear knob, which includes a "local" gear and a "remote" gear. When the gear knob is in the "local" gear, the main control module performs logical execution based on the operating instructions issued by the operating button; when the gear knob is in the "remote" gear, the main control module performs logical execution based on the operating instructions transmitted by the communication interface.

4. The substation maintenance interconnection power supply device according to claim 3 is characterized by: The interconnected power supply device is further provided with a smart meter and a signal sensing circuit. The signal sensing circuit is used to collect power supply data, and the smart meter is used to display the power supply data.

5. The substation maintenance interconnection power supply device according to claim 4 is characterized by: The power distribution cabinet is equipped with mounting components, which include adjustable clamps or cross-arm mounting pieces.

6. The substation maintenance interconnection power supply device according to claim 5 is characterized by: The power distribution cabinet is an outdoor waterproof power distribution cabinet.

7. A method for interconnecting and transferring power supply for maintenance of substations, characterized by: The steps include: S1. Use cables or overhead lines to connect the two ends of the interconnected circuit breaker between the remote ends of the circuit breaker on the low-voltage side of the maintenance area and the remote ends of the circuit breaker on the low-voltage side of an adjacent area. When the area is operating normally, the interconnected circuit breaker is in the normally open disconnected state, and the circuit breaker on the low-voltage side of the area is in the normally closed connected state. S2. Disconnect the low-voltage side circuit breaker of the maintenance area and obtain the maintenance start instruction; S3. In response to the maintenance start instruction, the interconnected circuit breaker is controlled to be turned on, and the load on the low-voltage side of the maintenance area is supplied with power from the low-voltage side of the adjacent area; S4. In response to the maintenance end instruction, disconnect the interconnected circuit breaker; S5. After the interconnected circuit breaker is disconnected, the low-voltage side circuit breaker of the maintenance area is controlled to be connected to restore the normal power supply of the maintenance area.

8. The method for interconnecting and transferring power supply for substation maintenance according to claim 7 is characterized by: The interconnected circuit breaker is connected to the substation maintenance interconnected power supply device, and the control circuit of the substation maintenance interconnected power supply device is used to control the interconnected circuit breaker.

9. A method for interconnecting and transferring power to a substation for maintenance according to claim 8, characterized in that: in S2, the substation for maintenance interconnecting and transferring power to a substation receives a maintenance start instruction, and after receiving the maintenance start instruction, initiates a self-test of the device; if the self-test is abnormal, an alarm message is displayed on the touch screen; if the self-test is normal, it is determined whether a safe interconnection condition is met; if the safe interconnection condition is met, the interconnection circuit breaker is controlled to be turned on; if the interconnection condition is not met, an alarm message is issued; In S4, the substation maintenance interconnection power supply device receives the maintenance end instruction, and after receiving the maintenance end instruction, controls the interconnection circuit breaker to open.

10. The method for interconnecting and transferring power supply for substation maintenance according to claim 9, characterized in that: The maintenance start command is triggered by: pressing the closing button when the gear knob is in "local"; or receiving a remote start command through the communication interface when the gear knob is in "remote"; The maintenance end instruction is triggered by: pressing the trip button, or receiving a remote end instruction through the communication interface.

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