A 10kV power distribution line fault positioning and recovery method

Abstract

The application relates to a 10kV power distribution line fault positioning and recovery method. The method judges whether the fault is a transient fault through a SCADA system and directly repairs the fault. Meanwhile, if the fault is not a transient fault, the fault point can be positioned to a fault line section. The method effectively solves the problems that, in the prior art, after tripping is found, on-site line inspection personnel need to find the fault point and perform power distribution recovery by on-site line inspection of the whole power distribution line, and the work is heavy and the work efficiency is low.

Description

Technical Field

[0001] This invention relates to the field of power distribution line faults, and more particularly to a method for locating and restoring faults in 10kV power distribution lines. Background Technology

[0002] In the power distribution field, 10kV distribution lines frequently experience outages. These are typically resolved through on-site inspections by specialized patrol personnel. This process requires manual location of the fault point along the entire distribution line, followed by repair to restore normal power operation. Because patrol personnel must physically inspect the entire distribution line to locate the fault and restore power, this process is labor-intensive and inefficient. Summary of the Invention

[0003] The purpose of this invention is to provide a method for fault location and restoration of 10kV distribution lines, which effectively solves the problems of large workload and low efficiency in existing 10kV distribution lines where, after a trip is detected, patrol personnel need to inspect the entire distribution line on-site to find the fault point and restore power distribution.

[0004] The technical solution adopted by this invention to solve its technical problem is: a method for fault location and recovery of 10kV distribution lines, comprising the following steps:

[0005] Step S1: Read the telemetry and telesignal values ​​of all tie switches on the 10kV distribution line in real time through the SCADA system; when a tie switch changes from closed to open, first define the tie switch as a trip switch; and then proceed to step S2.

[0006] Step S2: After the tripping switch trips, read the status of all tie switches on the 10kV distribution line where the tripping switch is located through the SCADA system, find the tie switch that has voltage on the side away from the tripping switch and no voltage on the side adjacent to the tripping switch, then define the tie switch as the original hot standby switch; and proceed to step S3.

[0007] Step S3: Close the original hot standby switch; if after closing the original hot standby switch, the other connecting switches on the distribution line between the original hot standby switch and the trip switch are in the closed position, then the tripping of the trip switch is determined to be a momentary fault; then by first closing the trip switch, and then switching the state of the original hot standby switch from the closed position to the open position, the normal operation of the distribution line can be restored.

[0008] If, after closing the original hot standby switch, the state of one of the tie switches on the distribution line between the original hot standby switch and the trip switch changes from closed to open, then the line between that tie switch and the trip switch is determined to be a faulty line; then, after the patrol personnel repair the fault point on-site, the original operation mode of the distribution line can be restored.

[0009] If the original hot standby switch changes from closed to open after being closed, the power distribution line between the original hot standby switch and the trip switch is determined to be a faulty line. After the patrol personnel repair the fault point on site, the original operation mode of the power distribution line is restored. The closing and switching from closed to open operations are both implemented by the SCADA system.

[0010] Furthermore, step S3 can also be: before closing the thermal standby switch, switch the status of all the contact switches in the closed position on the distribution line between the original thermal standby switch and the trip switch from the closed position to the open position; then close the original thermal standby switch. If the original thermal standby switch changes from the closed position to the open position after closing, then the distribution line between the original thermal standby switch and the trip switch is defined as a faulty line segment.

[0011] If the original hot standby switch operates normally after being closed, the tie switches are sequentially switched from open to closed in the direction from the original hot standby switch to the trip switch. The next tie switch is closed only when the previous tie switch is closed and operating normally. If all tie switches operate normally after being closed, the fault is determined to be an instantaneous fault. The trip switch is closed first, and then the state of the original hot standby switch is switched from closed to open. At this point, the normal operation of the power distribution line is restored. If a tie switch changes from closed to open after being closed, the power distribution line from that tie switch to the trip switch is defined as a faulty line segment. After the patrol personnel repair the fault point on-site, the original operation mode of the power distribution line is restored.

[0012] To further improve fault repair efficiency, when it is necessary to restore the original operation mode of the power distribution line after the fault point is repaired on-site by the patrol personnel, a power distribution line diagram of the faulty line section is generated and distributed to the patrol personnel.

[0013] The beneficial effects of this invention are as follows: First, it can determine whether a fault is transient and can be repaired directly through the SCADA system. Second, if it is not a transient fault, it can quickly and accurately locate the faulty line segment, narrowing the fault location from the entire 10kV distribution line to the faulty line segment. This greatly reduces the workload of patrol personnel, eliminating the need to inspect the entire 10kV distribution line on-site; simply repairing the faulty line segment restores the normal operation of the distribution line. This effectively reduces the workload of patrol personnel and improves the speed of fault location and the efficiency of fault repair. It effectively solves the problem of high workload and low efficiency in existing 10kV distribution lines, where after a trip is detected, patrol personnel need to inspect the entire distribution line on-site to find the fault point and restore power.

[0014] The present invention will be described in more detail below through examples. Detailed Implementation

[0015] An example of a method for fault location and recovery of a 10kV distribution line includes the following steps:

[0016] Step S1: Read the telemetry and telesignal values ​​of all tie switches on the 10kV distribution line in real time through the SCADA system; when a tie switch changes from closed to open, first define the tie switch as a trip switch; and then proceed to step S2.

[0017] Step S2: After the tripping switch trips, read the status of all tie switches on the 10kV distribution line where the tripping switch is located through the SCADA system, find the tie switch that has voltage on the side away from the tripping switch and no voltage on the side adjacent to the tripping switch, then define the tie switch as the original hot standby switch; and proceed to step S3.

[0018] Step S3: Close the original hot standby switch. If, after closing the original hot standby switch, the remaining connecting switches on the distribution line between the original hot standby switch and the trip switch are in the closed position, then the tripping of the trip switch is determined to be a momentary fault. The normal operation of the distribution line can be restored by first closing the trip switch and then switching the state of the original hot standby switch from the closed position to the open position. Closing can be done through the SCADA system. The switch from closed to open position is achieved through the SCADA system.

[0019] If, after closing the original hot standby switch, the state of one of the tie switches on the distribution line between the original hot standby switch and the trip switch changes from closed to open, then the line between that tie switch and the trip switch is determined to be a faulty line; then, after the patrol personnel repair the fault point on-site, the original operation mode of the distribution line can be restored.

[0020] If the original hot standby switch changes from closed to open after being closed, the power distribution line between the original hot standby switch and the trip switch is determined to be a faulty line; then the original operation mode of the power distribution line can be restored after the patrol personnel repair the fault point on site.

[0021] When it is necessary to restore the original operation mode of the power distribution line after the fault point is repaired on-site by the patrol personnel, a power distribution line diagram of the faulty line section is generated and distributed to the patrol personnel.

[0022] Example 2 is based on Example 1, except for step S3, the rest is the same as Example 2. After step S2, it includes step S3: before closing the hot standby switch, the state of all the closing state tie switches on the distribution line between the original hot standby switch and the trip switch is switched from the closed position to the open position; then the original hot standby switch is closed. If the original hot standby switch changes from the closed position to the open position after being closed, then the distribution line between the original hot standby switch and the trip switch is defined as a faulty line segment.

[0023] If the original hot standby switch operates normally after being closed, the tie switches are sequentially switched from open to closed in the direction from the original hot standby switch to the trip switch. The next tie switch is closed only when the previous tie switch is closed and operating normally. If all tie switches operate normally after being closed, the fault is determined to be an instantaneous fault. The trip switch is closed first, and then the state of the original hot standby switch is switched from closed to open. At this point, the normal operation of the power distribution line is restored. If a tie switch changes from closed to open after being closed, the power distribution line from that tie switch to the trip switch is defined as a faulty line segment. After the patrol personnel repair the fault point on-site, the original operation mode of the power distribution line is restored.

[0024] As mentioned above, the closing and switching from the closed position to the open position can be achieved through the SCADA system.

[0025] In the description of this invention, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicating orientation or positional relationships, are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms “a” and “an” as used herein are also intended to include the plural. It should also be understood that the terms “comprising” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, without excluding the presence or addition of one or more other features, integers, steps, operations, units, components, and / or combinations thereof.

[0028] The present invention has been described above by way of example. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A method for fault location and recovery of a 10kV distribution line, characterized in that: Includes the following steps: Step S1: Read the telemetry and telesignal values ​​of all tie switches on the 10kV distribution line in real time through the SCADA system; when a tie switch changes from closed to open, first define the tie switch as a trip switch; and then proceed to step S2. Step S2: After the tripping switch trips, read the status of all tie switches on the 10kV distribution line where the tripping switch is located through the SCADA system, find the tie switch that has voltage on the side away from the tripping switch and no voltage on the side adjacent to the tripping switch, and define the tie switch as the original hot standby switch. Proceed to step S3; Step S3: Close the original hot standby switch; if after closing the original hot standby switch, the other connecting switches on the distribution line between the original hot standby switch and the trip switch are in the closed position, then the tripping of the trip switch is determined to be a momentary fault; then by first closing the trip switch, and then switching the state of the original hot standby switch from the closed position to the open position, the normal operation of the distribution line can be restored. If, after closing the original hot standby switch, the state of one of the tie switches on the distribution line between the original hot standby switch and the trip switch changes from closed to open, then the line between that tie switch and the trip switch is determined to be a faulty line; then, after the patrol personnel repair the fault point on-site, the original operation mode of the distribution line can be restored. If the original hot standby switch changes from closed to open after being closed, the power distribution line between the original hot standby switch and the trip switch is determined to be a faulty line. After the patrol personnel repair the fault point on site, the original operation mode of the power distribution line is restored. The closing and switching from closed to open operations are both implemented by the SCADA system.

2. The method for fault location and restoration of 10kV distribution lines according to claim 1, characterized in that: Step S3 can also be: before closing the hot standby switch, switch all the closing status interconnection switches on the distribution line between the original hot standby switch and the trip switch from the closed position to the open position; then close the original hot standby switch. If the original hot standby switch changes from the closed position to the open position after closing, then the distribution line between the original hot standby switch and the trip switch is defined as the faulty line segment. If the original hot standby switch operates normally after being closed, the tie switches are switched from open to closed sequentially in the direction from the original hot standby switch to the trip switch. The next tie switch is closed only when the previous tie switch is closed and operating normally. If all tie switches are closed and operating normally, the fault is determined to be a momentary fault. The trip switch is closed first, and then the state of the original hot standby switch is switched from closed to open. At this point, the normal operation of the power distribution line is restored. If a tie switch changes from the closed position to the open position after being closed, the power distribution line from that tie switch to the trip switch is defined as a faulty line segment. After the patrol personnel repaired the fault point on-site, the power distribution line was restored to its original operating mode.

3. The method for fault location and restoration of 10kV distribution lines according to claim 1 or 2, characterized in that: When it is necessary to restore the original operation mode of the power distribution line after the fault point is repaired on-site by the patrol personnel, a power distribution line diagram of the faulty line section is generated and distributed to the patrol personnel.