A replacement inspection method for the circuit breaker protection panel with 3 / 2 wiring

Abstract

The invention relates to the field of power system operation analysis and inspection, and provides a 3 / 2 wiring circuit breaker protection screen replacement inspection method, the method comprising: powering off the circuit breaker of the circuit breaker protection screen to be replaced, and supplying power to the line through the busbar through the circuit breaker not to be replaced; replacing the circuit breaker protection screen, and setting the replaced circuit breaker protection screen to a waiting state; setting each line protection screen of the line adjacent to the circuit breaker protection screen to be inspected in turn to an inspection state; connecting each phase of the line protection screen in the inspection state to each phase opening position of the circuit breaker protection screen to be inspected, respectively inspecting each phase of the circuit breaker to be inspected, and repairing the circuit breaker protection screen to be inspected according to the inspection result; after each line protection screen has inspected the circuit breaker protection screen to be repaired, the circuit breaker protection screen to be inspected is put into operation, thereby avoiding the influence caused by the line power outage and improving the inspection efficiency of the circuit breaker protection screen.

Description

Technical Field

[0001] The present invention relates to the field of operation analysis and inspection of power systems, and particularly to a method for replacing and inspecting a circuit breaker protection panel with a 3 / 2 wiring method. Background Art

[0002] In recent years, a high proportion of the protection equipment in power plants and substations has been in service beyond its due date, and among them, the circuit breaker protection has been in service beyond its due date for a long time. This situation seriously threatens the safe operation of the power grid and new circuit breaker protection needs to be replaced.

[0003] However, in the prior art, for the traditional method of replacing the circuit breaker protection panel with a 3 / 2 wiring method, the operating line is converted to the maintenance state, the two circuit breaker protection panels connected to the transmission line are de-energized, after removing the circuit breaker protection panel in service beyond its due date, a new circuit breaker protection panel is installed, and then the relevant circuits of the circuit breaker protection panel are debugged and accepted for commissioning. During the whole process of replacement and inspection, the line must be powered off, which affects the power transmission of the power grid. In the context of the current shortage of power resources, it is often difficult to power off the system in a timely manner, resulting in the delay of the work of replacing the circuit breaker protection panel, and the protection in service beyond its due date cannot be replaced in time, further threatening the safe operation of the power grid. Summary of the Invention

[0004] The present invention provides a method for replacing and inspecting a circuit breaker protection panel with a 3 / 2 wiring method, which is used to solve the problem that the circuit breaker protection panel with a 3 / 2 wiring method needs to be replaced and inspected with the operating line powered off.

[0005] A method for replacing and inspecting a circuit breaker protection panel with a 3 / 2 wiring method provided by the present invention includes:

[0006] Power off the circuit breaker of the circuit breaker protection panel to be replaced, and supply power to the line through the non-circuit breaker to be replaced to the bus.

[0007] Replace the circuit breaker protection panel and set the replaced circuit breaker protection panel to the state to be inspected.

[0008] Set the circuit protection panels of each line adjacent to the circuit breaker protection panel to be inspected to the inspection state in turn. The inspection state includes: respectively withdraw the trip outlet pressure plates of phase A, phase B, and phase C of the line protection panel at the side circuit breaker and the middle circuit breaker, and the start failure and reclosing pressure plates of phase A, phase B, and phase C, withdraw the blocking reclosing pressure plate of the line protection panel at the side circuit breaker and the middle circuit breaker, and disconnect the pilot channel of the line protection panel.

[0009] Connect each phase of the line protection panel in the inspection state to the tripping position of each phase of the circuit breaker protection panel to be inspected respectively, check each phase of the circuit breaker to be inspected respectively, and repair the circuit breaker protection panel to be inspected according to the inspection results.

[0010] After each line protection panel has completed the inspection of the circuit breaker protection panel to be overhauled, the circuit breaker protection panel to be inspected is put into operation.

[0011] Optionally, setting the replaced circuit breaker protection panel to the to-be-inspected state specifically includes:

[0012] If the circuit breaker protection panel to be replaced is a side circuit breaker protection panel, then according to the line adjacent to the side circuit breaker, withdraw the remote trip outlet pressure plate for the malfunction starting adjacent line, withdraw the outlet pressure plates for the malfunction tripping the circuit breaker in series and the malfunction starting the bus outlet, and put into the single-phase and reclosing outlet pressure plates;

[0013] If the circuit breaker protection panel to be replaced is an intermediate circuit breaker protection panel, then withdraw the remote trip outlet pressure plates for the malfunction starting the first line and the second line, withdraw the outlet pressure plates for the malfunction tripping the two side circuit breakers in series, and put into the single-phase and reclosing outlet pressure plates.

[0014] Optionally, the specific method of supplying power to the line from the bus through a non-replaced circuit breaker is as follows:

[0015] If the circuit breaker protection panel to be replaced is a side circuit breaker protection panel, then the bus not adjacent to the circuit breaker protection panel to be replaced supplies power to the first line and the second line respectively through another side circuit breaker and an intermediate circuit breaker;

[0016] If the circuit breaker protection panel to be replaced is an intermediate circuit breaker protection panel, then the first bus and the second bus supply power to the first line and the second line respectively through their respective adjacent side circuit breakers.

[0017] Optionally, the specific method of inspecting each phase of the circuit breaker to be inspected is as follows:

[0018] Put into the single-phase trip outlet pressure plate of the circuit breaker, put into the pressure plates for starting single-phase malfunction and reclosing of the circuit breaker, the line protection panel operates, trips the corresponding phase, and obtains the inspection result of the corresponding phase according to the operation of the circuit breaker to be detected. Inspect another phase until the inspection results of the corresponding single-phase for each phase are obtained.

[0019] Optionally, the specific method of inspecting another phase is as follows: After waiting for a preset time, inspect another phase; the preset time is not less than the sum of the reclosing charging time, the line protection operation time and the circuit breaker tripping time.

[0020] Optionally, the specific method of overhauling the circuit breaker protection panel to be inspected according to the inspection result is as follows:

[0021] According to the inspection result, judge whether the circuit breaker trips correctly and the reclosing is successful. If not, overhaul the corresponding phase of the circuit breaker protection panel and reinspect the overhauled phase until each phase of the circuit breaker protection panel can trip correctly and the reclosing is successful.

[0022] Optionally, before inspecting each phase of the circuit breaker to be inspected respectively, the method includes:

[0023] Check whether the line protection panel can correctly issue a single-phase tripping command, and whether it can correctly issue a reclosing output signal after issuing a single-phase tripping command; if the single-phase tripping command is not issued correctly or the reclosing output signal is not issued, the line protection panel and the corresponding secondary circuit need to be inspected and repaired.

[0024] Optionally, the specific steps of connecting the line protection screen to the disconnecting positions of each phase of the circuit breaker protection screen to be tested are as follows: the line protection screen is connected to the disconnecting positions, tripping circuits, starting failures, remote tripping and locked reclosing circuits of phases A, B and C of the circuit breaker protection screen to be tested, and the circuit breaker is placed in a closed state.

[0025] Optionally, before setting each line protection screen to the inspection state in turn, the method further includes:

[0026] Obtain the collected data of multiple line protection screens of the adjacent lines of the circuit breaker to be inspected, and compare the collected data of each line protection screen according to a preset ratio. If the difference in the collected data of each line protection screen on the same line is greater than the preset ratio, the line protection screen on the line is repaired.

[0027] Optionally, after each of the line protection screens has completed the inspection of the circuit breaker protection screen to be inspected, the circuit breaker protection screen to be inspected is put into operation, including:

[0028] If the circuit breaker protection screen to be replaced is a middle circuit breaker protection screen, after the line protection screens of the first line and the second line have completed the inspection of the circuit breaker protection screen to be inspected, the circuit breaker protection screen to be inspected is put into operation.

[0029] It can be seen from the above technical scheme that the present invention has the following advantages: by shutting down the power supply to the circuit breaker to be inspected, the busbar supplies power to the line through the circuit breaker not to be inspected; the line protection screens of the adjacent lines of the circuit breaker protection screen to be inspected are set to the inspection state in turn, and the phases of the line protection screens in the inspection state are respectively connected to the phase opening positions of the circuit breaker protection screen to be inspected, and the phases of the circuit breaker to be inspected are respectively inspected, and the circuit breaker protection screen to be inspected is repaired according to the inspection results; after the inspection of the circuit breaker protection screen to be repaired by each line protection screen is completed, the circuit breaker protection screen to be inspected is put into operation, so that the circuit breaker protection screen can be replaced and inspected without powering off the line, the states of the circuit breaker protection screen to be inspected and the line protection screen are set to avoid malfunction of the running equipment, and the line protection screen is used to inspect the phases of the circuit breaker protection screen, thereby avoiding the influence of power outage on the running line and improving the inspection efficiency of the circuit breaker protection screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 Flow chart of the replacement inspection method for the breaker protection panel with 3 / 2 wiring;

[0032] Figure 2 Schematic diagram of the 3 / 2 wiring line;

[0033] Figure 3 Flow chart of the breaker setting for the replacement inspection method of the breaker protection panel with 3 / 2 wiring;

[0034] Figure 4 Flow chart of the inspection of the line protection panel for the replacement inspection method of the breaker protection panel with 3 / 2 wiring;

[0035] Figure 5 General flow chart of the replacement inspection method for the breaker protection panel with 3 / 2 wiring. Detailed implementation manners

[0036] The embodiments of the present invention provide a replacement inspection method for the breaker protection panel with 3 / 2 wiring, which is used to solve the problem that the replacement inspection of the breaker protection panel in 3 / 2 wiring requires the power outage of the operating line.

[0037] To make the objectives, features, and advantages of the present invention more obvious and understandable, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] Please refer to Figure 1 , Figure 1 Flow chart of a replacement inspection method for the breaker protection panel with 3 / 2 wiring provided by the embodiments of the present invention.

[0039] A replacement inspection method for the breaker protection panel with 3 / 2 wiring provided by the present invention includes:

[0040] Step S100, de-energize the breaker of the breaker protection panel to be replaced, and supply power to the line through the non-replacement breaker to the busbar;

[0041] It should be noted that, in this embodiment, the circuit breaker is arranged on a 500kv 3 / 2 wiring line. The 3 / 2 wiring method means that three circuit breakers are arranged in series between two busbars to form a string.

[0042] See also Figure 2 , Figure 2 The schematic diagram of the 3 / 2 wiring circuit provided in the embodiment of the present invention, 1 and 2 are respectively the first busbar and the second busbar, 6, 7, and 8 are respectively three circuit breakers, 17 and 18 are respectively the first line and the second line, three circuit breakers are connected in series between the two busbars, and a transmission line is led out between every two circuit breakers. The circuit breakers connected to the busbars are called side circuit breakers, i.e. side circuit breakers 6 and side circuit breakers 8, and the circuit breakers shared by the two middle lines are called circuit breakers 7. Furthermore, 3, 4, and 5 are respectively the circuit breaker protection current transformers of circuit breakers 6, 7, and 8. In this embodiment, the protection screen is equipped with circuit breaker failure protection, automatic reclosing, three-phase inconsistency protection, dead zone protection, charging protection, circuit breaker operation box, and contains two sets of phase tripping circuits, one set of phase closing circuits, and a manual closing line selection acceleration circuit. Further, 9 , 10 , 13 and 14 are line protection current transformers of the first line 17 , and 11 , 12 , 15 and 16 are line protection current transformers of the second line 18 .

[0043] Furthermore, in the 3 / 2 wiring mode, one of the circuit breakers can be disconnected, allowing the busbar to supply power to the line through the other two circuit breakers.

[0044] Step S200, replacing the circuit breaker protection screen, and setting the replaced circuit breaker protection screen to a waiting state;

[0045] It should be noted that the pressure plates of the replaced circuit breaker protection screen are set to the waiting state in order to prevent the replaced circuit breaker protection screen from erroneously operating the circuit breaker and the circuit during the inspection.

[0046] Step S300, setting each line protection screen of the adjacent line of the circuit breaker protection screen to be inspected to the inspection state in turn, the inspection state includes: respectively withdrawing the line protection screen on the side circuit breaker and the circuit breaker, the tripping outlet pressure plate of phase A, phase B and phase C and the starting failure and reclosing pressure plate of phase A, phase B and phase C, withdrawing the locking reclosing pressure plate of the line protection screen on the side circuit breaker and the circuit breaker, and disconnecting the longitudinal connection channel of the line protection screen;

[0047] It should be noted that in the above steps, each line protection screen is set to the inspection state in turn, while other line protection screens are in normal state. The line protection screens that are not in the inspection state still have the task of protecting the safe operation of the line.

[0048] Further, separately withdraw the trip outlet pressure plates of phases A, B, and C of the line protection panel at the side circuit breaker and the intermediate circuit breaker, as well as the start failure and reclosing pressure plates of phases A, B, and C. Withdraw the blocking reclosing pressure plate of the line protection panel at the side circuit breaker and the intermediate circuit breaker, and disconnect the pilot channel of the line protection panel. At this time, the opposite line protection panel of the line where the circuit breaker protection panel is located cannot receive signals, avoiding misoperation of the opposite line protection panel when the line protection panel inspects the circuit breaker to be tested in the subsequent steps and affecting other operating circuits and devices.

[0049] Further, the upper and lower ends of the withdrawn pressure plates can be sealed with insulating tape to ensure the safety and reliability of the verification process.

[0050] S400. Connect each phase of the line protection panel in the inspection state to the opening position of each phase of the circuit breaker protection panel to be tested; check each phase of the circuit breaker to be tested, and perform maintenance on the circuit breaker protection panel to be tested according to the inspection results.

[0051] It should be noted that in this embodiment, each phase needs to be inspected separately, that is, single-trip inspection is used to verify the connection of the circuit breaker protection panel. Therefore, each phase of the line protection panel is connected to the opening position of each phase of the circuit breaker protection panel to be tested, so that the line protection panel can inspect the single phase of the circuit breaker protection panel with single-phase single-trip.

[0052] Further, after each phase of the line protection panel is connected to each phase of the circuit breaker protection panel to be tested, check each phase. According to the corresponding action results executed by the circuit breaker to be tested, it can be known whether the circuit breaker protection panel needs to be maintained and which phase needs to be maintained.

[0053] Step S500. After each line protection panel has completed the inspection of the circuit breaker protection panel to be maintained, put the circuit breaker protection panel to be tested into operation.

[0054] It should be noted that in this embodiment, for a 500 kV voltage level transmission line, a dual protection configuration will be set. Two sets of line protection panels are configured on each side of the line as backups for each other. When one set of line protection fails, the other set of line protection completes the tripping and closing tasks. Each set of line protection panels can independently complete the tripping task. Specifically, there are main one line protection panel and main two line protection panel. Refer to Figure 2, there are line protections on both sides of line 17, where 9 and 14 are the main first protection current transformers of the first line 17, 10 and 13 are the main second protection current transformers of the first line 17, and there are line protections on both sides of line 18, where 11 and 16 are the main first protection current transformers of the second line 18, and 12 and 15 are the main second protection current transformers of the second line 18. When one of the line protection screens is set to the inspection state, the other line protection screen can still complete the protection task of tripping to ensure the uninterrupted operation of the line. At the same time, the circuit breaker protection screen contains two groups of phase tripping circuits, which are respectively connected to the main first line protection screen and the main second protection device. Therefore, after verifying whether the circuit breaker protection screen and each phase of one of the two sets of line protection screens are correctly connected and reliably operated, only the verification of one group of phase tripping circuits of the circuit breaker protection screen is completed, and the verification of the phase tripping circuit of the other group needs to be completed, that is, the main first and main second line protection screens need to be verified in the above steps respectively.

[0055] Furthermore, the inspection of the side circuit breaker only requires the inspection of the main one and main two protections of the line adjacent to it on the 3 / 2 connection. For the circuit breaker, because it is adjacent to both lines on the 3 / 2 connection, it is necessary to inspect the main one and main two line protection screens of the two transmission lines. That is, the side circuit breaker needs to be inspected twice, corresponding to the two sets of line protection screens of one line, and the circuit breaker needs to be inspected four times, corresponding to the two sets of line protection screens of each of the two lines.

[0056] In this embodiment, the circuit breaker of the circuit breaker protection screen to be replaced is powered off, and the busbar supplies power to the line through the circuit breaker not to be replaced; the circuit breaker protection screen is replaced, and the replaced circuit breaker protection screen is set to the waiting state; each line protection screen of the adjacent line of the circuit breaker protection screen to be inspected is set to the inspection state in turn, and each phase of the line protection screen in the inspection state is respectively connected to the phase opening position of the circuit breaker protection screen to be inspected, and each phase of the circuit breaker to be inspected is inspected respectively, and the circuit breaker protection screen to be inspected is repaired according to the inspection result; after each line protection screen has inspected the circuit breaker protection screen to be repaired, the circuit breaker protection screen to be inspected is put into operation, so that the circuit breaker protection screen can complete the replacement inspection without power outage of the running line, and the status of the circuit breaker protection screen to be inspected and the line protection screen is set to avoid malfunction of the running equipment, so that the 3 / 2 wiring can complete the replacement inspection of the circuit breaker protection screen while ensuring that the line is not shut down, avoiding the impact on the running line equipment, increasing the reliability of the line power supply, and improving the inspection efficiency of the circuit breaker protection screen.

[0057] The above is a detailed description of the first embodiment of a 3 / 2 wiring circuit breaker protection screen replacement inspection method provided by the present application. The following is a detailed description of the second embodiment of a 3 / 2 wiring circuit breaker protection screen replacement inspection method provided by the present application.

[0058] Refer to Figure 3 , Figure 3 which is the circuit breaker setting flowchart of the inspection method for replacing the circuit breaker protection panel with 3 / 2 wiring;

[0059] In step S100 of the foregoing embodiment, the power-off of the circuit breaker of the circuit breaker protection panel to be replaced and the power supply from the bus to the line through the non-circuit breaker to be replaced are specifically as follows:

[0060] S110, power off the circuit breaker of the circuit breaker protection panel to be replaced, and determine whether the circuit breaker protection panel to be replaced is a side circuit breaker. If so, go to step S120; if not, go to step S130;

[0061] It should be noted that the relevant secondary circuits of the circuit breaker protection panel to be replaced are removed, and a new circuit breaker protection panel to be inspected is installed. At this time, there will be different power supply methods without power-off in different positions of the circuit breaker protection panel to be replaced in 3 / 2 wiring.

[0062] S120, supply power to the first line and the second line respectively from the bus that is not adjacent to the circuit breaker protection panel to be replaced through another side circuit breaker and the intermediate circuit breaker, and enter step S210;

[0063] It should be noted that when the circuit breaker to be replaced is a side circuit breaker and is powered off, the bus supplies power to two transmission lines through the other side circuit breaker and the intermediate circuit breaker. That is, for example, when side circuit breaker 6 is powered off, bus 2 supplies power to line 17 and line 18 respectively through side circuit breaker 8 and intermediate circuit breaker 7, ensuring that the line can operate without power-off;

[0064] Furthermore, the to-be-inspected status of the side circuit breaker needs to be set for the corresponding subsequent inspection.

[0065] S130, supply power to the first line and the second line respectively from the first bus and the second bus through their respective adjacent side circuit breakers, and enter step S220.

[0066] It should be noted that when the circuit breaker to be replaced is an intermediate circuit breaker and is powered off, the bus supplies power to two transmission lines through two side circuit breakers respectively. That is, for example, when intermediate circuit breaker 7 is powered off, bus 1 and bus 2 supply power to line 17 and line 18 respectively through side circuit breaker 6 and side circuit breaker 8, ensuring that the line can operate without power-off;

[0067] Furthermore, the to-be-inspected status of the intermediate circuit breaker needs to be set for the corresponding subsequent inspection.

[0068] In step S200 of the foregoing embodiment, the replacement of the circuit breaker protection panel and the setting of the replaced circuit breaker protection panel to the to-be-inspected status are specifically as follows:

[0069] S210, Replace the circuit breaker protection panel. According to the line adjacent to the side circuit breaker, withdraw the remote trip outlet pressure plate for the malfunction start of the adjacent line, withdraw the outlet pressure plates for the malfunction intertripping of the circuit breaker and the outlet of the bus where the malfunction starts, and insert the single-phase reclosure and reclosing outlet pressure plates.

[0070] It should be noted that based on the different positions of the side circuit breaker and the intermediate circuit breaker in the 3 / 2 wiring line, the corresponding settings of the states to be inspected are also different.

[0071] Further, refer to Figure 2 , if the circuit breaker is the side circuit breaker 6, its adjacent line is the first line 17, and the remote trip outlet pressure plate for the malfunction start of the adjacent line that needs to be withdrawn is the remote trip outlet pressure plate for the malfunction start of the first line.

[0072] The setting of this outlet pressure plate is to ensure that during the verification of the side circuit breaker protection panel, the side circuit breaker will not malfunction the protection of the intermediate circuit breaker, the bus protection, and the opposite circuit of the line connected to the side circuit breaker during operation; further, the upper and lower ends of the withdrawn pressure plate can also be sealed with insulating tape to ensure the safety and reliability of the verification process.

[0073] S220, Replace the circuit breaker protection panel. Withdraw the remote trip outlet pressure plates for the malfunction start of the first line and the second line, withdraw the outlet pressure plates for the malfunction intertripping of the two side circuit breakers, and insert the single-phase reclosure and reclosing outlet pressure plates.

[0074] It should be noted that the setting of this outlet pressure plate is to ensure that during the verification of the intermediate circuit breaker protection panel, the protection of the two side circuit breakers during operation and the opposite circuits of the two lines connected to the intermediate circuit breaker will not malfunction; further, the upper and lower ends of the withdrawn pressure plate can also be sealed with insulating tape to ensure the safety and reliability of the verification process.

[0075] In this embodiment, by de-energizing the circuit breaker of the circuit breaker protection panel to be replaced and supplying power to the line through the non-circuit breaker to be replaced; replacing the circuit breaker protection panel and setting the replaced circuit breaker protection panel to the state to be inspected; enabling the 3 / 2 wiring to complete the replacement inspection of the circuit breaker protection panel while ensuring that the line is not de-energized, avoiding the impact on the line equipment in operation, increasing the reliability of line power supply, and improving the inspection efficiency of the circuit breaker protection panel.

[0076] The above is the detailed description of the second embodiment of a method for replacing and inspecting the circuit breaker protection panel of a 3 / 2 wiring. The following is the detailed description of the third embodiment of a method for replacing and inspecting the circuit breaker protection panel of a 3 / 2 wiring provided by this application.

[0077] Refer to Figure 4 , Figure 4 is the line protection panel inspection flowchart of the method for replacing and inspecting the circuit breaker protection panel of a 3 / 2 wiring;

[0078] In step S300 of the foregoing embodiment, each line protection panel is alternately set to the inspection state, and each phase of the line protection panel set to the inspection state is respectively connected to the tripping positions of each phase of the circuit breaker protection panel to be inspected; the inspection state includes: respectively withdrawing the tripping outlet pressure plates of phase A, phase B, and phase C of the line protection panel at the side circuit breaker and the intermediate circuit breaker, and the starting failure and reclosing pressure plates of phase A, phase B, and phase C, withdrawing the blocking reclosing pressure plate of the line protection panel at the side circuit breaker and the intermediate circuit breaker, and disconnecting the pilot channel of the line protection panel, specifically including:

[0079] S310, Obtain the acquisition quantities of multiple line protection panels of the adjacent lines of the circuit breaker to be inspected, compare the acquisition quantities of each line protection panel according to a preset ratio. If the difference in the acquisition quantities of the line protection panels on the same line is greater than the preset ratio, repair the line protection panel on that line;

[0080] It should be noted that in this embodiment, under the condition of no power outage on the line, compare and view the respective acquisition quantities of the main line protection panel 1 and the main line protection panel 2. The items of the acquisition quantities include: phase A current, phase B current, phase C current, zero-sequence current, phase A voltage, phase B voltage, phase C voltage, and synchronization voltage; if after comparing the acquisition quantities of the two line protection panels, the difference in any corresponding acquisition item is greater than the preset ratio, then the line protection panel needs to be repaired; in this embodiment, the preset ratio is set to 5%.

[0081] Furthermore, the intermediate circuit breaker needs to compare the acquisition quantities of multiple line protection panels of the first line and the second line respectively.

[0082] S320, Set one of the line protection panels not set to the inspection state to the inspection state;

[0083] It should be noted that in step S320, all the line protection panels adjacent to the circuit breaker protection panel to be inspected need to be alternately set to the inspection state, and only one of them is set each time. The inspection state includes: respectively withdrawing the tripping outlet pressure plates of phase A, phase B, and phase C of the line protection panel at the side circuit breaker and the intermediate circuit breaker, and the starting failure and reclosing pressure plates of phase A, phase B, and phase C, withdrawing the blocking reclosing pressure plate of the line protection panel at the side circuit breaker and the intermediate circuit breaker, and disconnecting the pilot channel of the line protection panel; to avoid misoperation of the line protection panel on the opposite side when the line protection panel inspects the circuit breaker to be inspected in the subsequent steps, affecting other operating circuits and devices.

[0084] In step S400 of the foregoing embodiment, each phase of the line protection panel in the inspection state is respectively connected to the tripping positions of each phase of the circuit breaker protection panel to be inspected, and each phase of the circuit breaker to be inspected is respectively inspected, and the circuit breaker protection panel to be inspected is repaired according to the inspection results, specifically including:

[0085] S410. Connect each phase of the line protection panel set to the inspection state to the opening positions of the corresponding phases of the circuit breaker protection panel to be inspected.

[0086] It should be noted that the line protection panel is connected to the opening positions, tripping circuits, starting malfunctions, remote tripping, and blocking reclosing circuits of phases A, B, and C of the circuit breaker protection panel to be inspected. After setting the circuit breaker to the closing state and connecting the line protection panel to the opening positions of the corresponding phases of the circuit breaker protection panel to be inspected, the protection menu in the line protection panel can be opened, that is, check whether the position changes of each opening position are correct in the system of the line protection panel.

[0087] It should be noted that after setting the circuit breaker to the closing state, it is necessary to check whether the charging light of the reclosing in the circuit breaker protection panel is on to ensure that the reclosing is in the power-on charging state at this time before the subsequent inspection operations can be completed.

[0088] S420. Insert the single-phase tripping outlet pressure plate of the circuit breaker, insert the pressure plate for starting single-phase malfunctions and reclosing of the circuit breaker, and the line protection panel trips the corresponding phase.

[0089] It should be noted that the single-trip inspection carried out in this embodiment is to insert the pressure plates corresponding to a single phase and trip the corresponding single phase on the line protection panel. For example, when inserting the pressure plate corresponding to phase A, the line protection panel trips phase A.

[0090] Furthermore, after the line protection panel trips the corresponding phase, it is necessary to check whether the line protection panel can issue a tripping command, whether it is the correct phase, and whether a reclosing outlet signal can be issued after correctly issuing a single-phase tripping command.

[0091] If the single-phase tripping command is not correctly issued or the reclosing outlet signal is not issued, it is necessary to repair the line protection panel or the corresponding secondary circuit to avoid inspection failures in subsequent steps caused by signal source problems; after the repair is completed, trip the corresponding single phase on the line protection panel again.

[0092] S430. Obtain the inspection result based on the operation of the circuit breaker, and judge whether the circuit breaker trips correctly and the reclosing is successful. If not, enter step S440; if so, enter step S450.

[0093] It should be noted that after the single-trip on the line protection panel, the circuit breaker should also trip correspondingly and the reclosing should be successful. If the circuit breaker does not trip, trips the wrong phase, or the reclosing is not successful after correct tripping, it is necessary to repair the corresponding phase of the circuit breaker protection panel.

[0094] S440. Repair the corresponding phase of the circuit breaker protection panel and return to step S420.

[0095] S450, Determine whether each phase of the circuit breaker protection panel has been inspected. If not, proceed to step S460; otherwise, proceed to step S470.

[0096] S460, Select the uninspected phase, wait for a preset time, and return to step S420;

[0097] It should be noted that the inspection of each phase of the circuit breaker protection panel by the same line protection panel needs to be completed. Before returning to step S420 after replacing the uninspected phase, a preset time needs to be waited. The preset time is not less than the sum of the reclosing charging time, the line protection operation time, and the circuit breaker tripping time, to avoid affecting the inspection result due to the circuit breaker entering the judgment before being fully reset.

[0098] In this embodiment, the reclosing charging time is generally 15 seconds. Considering the line protection operation time and the circuit breaker tripping time, the inspection interval needs to reach 3 minutes each time to ensure that the reclosing charging is completed and reliable reclosing can be achieved.

[0099] S470, Determine whether all the line protection panels of the adjacent lines of the circuit breaker protection panel to be inspected have been inspected. If not, proceed to step S320; if so, proceed to step S500;

[0100] It should be noted that for the circuit breaker protection panel to be inspected, it is necessary to complete the inspection of all the line protection panels of each adjacent line to confirm that the circuit breaker protection panel can be used reliably. If the inspection of all the line protection panels of the adjacent lines has not been completed, the uninspected line protection panel needs to be selected, and return to step S320 to set the inspection status and continue to inspect the circuit breaker protection panel to be inspected.

[0101] Furthermore, in this embodiment, for the side circuit breaker protection panel, it only needs to determine that the main line protection panel 1 and the main line protection panel 2 of the only adjacent line have been inspected; for the middle circuit breaker, it is necessary to determine that the main line protection panel 1 and the main line protection panel 2 of each of the first line and the second line, a total of four line protection panels, have completed the inspection of the middle circuit breaker protection panel.

[0102] S500, After all the line protection panels have completed the inspection of the circuit breaker protection panel to be repaired, put the circuit breaker protection panel to be inspected into operation

[0103] Furthermore, please refer to Figure 5 , Figure 5 for the overall flowchart of the inspection method for replacing the circuit breaker protection panel with 3 / 2 wiring. Figure 5 The step content in can refer to the corresponding process in the foregoing embodiment and will not be elaborated here.

[0104] In this embodiment, by setting up the line protection panel, it is ensured that another set of line protection in the non-inspection state operates normally. If a line fault occurs, the protection task of tripping can be completed by another line protection panel in the non-to-be-inspected state, ensuring the continuous power supply of the line. At the same time, it is avoided that the line protection panel malfunctions during the inspection process on the equipment in operation. The inspection of each phase of all adjacent line protection panels of the breaker protection panel is completed, enabling the 3 / 2 wiring to complete the replacement inspection of the breaker protection panel while ensuring the continuous power supply of the line, avoiding the impact on the line equipment in operation, increasing the reliability of the line power supply, and improving the inspection efficiency of the breaker protection panel.

[0105] In summary, the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A replacement inspection method for a circuit breaker protection panel with 3 / 2 wiring, characterized in that Including: Cut off the power supply of the circuit breaker of the circuit breaker protection panel to be replaced, and supply power to the line from the bus through the circuit breaker that is not to be replaced; Replace the circuit breaker protection panel, and set the replaced circuit breaker protection panel to the state to be inspected; Set the line protection panels of each line adjacent to the circuit breaker protection panel to be inspected in turn. The inspection state includes: withdraw the trip outlet pressure plates of phase A, phase B, and phase C on the line protection panel connected to the side circuit breaker, and the starting failure and reclosing pressure plates of phase A, phase B, and phase C, withdraw the trip outlet pressure plates of phase A, phase B, and phase C on the line protection panel connected to the middle circuit breaker, and the starting failure and reclosing pressure plates of phase A, phase B, and phase C, withdraw the blocking reclosing pressure plates on the line protection panels connected to the side circuit breaker and the middle circuit breaker, and disconnect the pilot channel of the line protection panel; Connect each phase of the line protection panel in the inspection state to the opening position of each phase of the circuit breaker protection panel to be inspected respectively, check each phase of the circuit breaker to be inspected respectively, and repair the circuit breaker protection panel to be inspected according to the inspection results; After each line protection panel has completed the inspection of the circuit breaker protection panel to be repaired, put the circuit breaker protection panel to be inspected into operation.

2. The replacement inspection method for the breaker protection panel with 3 / 2 wiring according to claim 1, characterized in that The specific operation of setting the replaced circuit breaker protection panel to the state to be inspected is: If the circuit breaker protection panel to be replaced is the side circuit breaker protection panel, then according to the lines adjacent to the side circuit breaker, withdraw the remote trip outlet pressure plate for failure starting of the adjacent line, withdraw the outlet pressure plates for failure tripping of the middle circuit breaker and failure starting of the bus where the failure occurs, and put in the reclosing outlet pressure plate; If the circuit breaker protection panel to be replaced is the middle circuit breaker protection panel, then withdraw the remote trip outlet pressure plates for failure starting of the first line and the second line, withdraw the outlet pressure plates for failure tripping of the two side circuit breakers, and put in the reclosing outlet pressure plate.

3. A method for replacing and inspecting a circuit breaker protection panel with a 3 / 2 wiring, as claimed in claim 1, wherein The specific operation of supplying power to the line from the bus through the circuit breaker that is not to be replaced is: If the circuit breaker protection panel to be replaced is the side circuit breaker protection panel, then supply power to the first line and the second line respectively from the bus that is not adjacent to the circuit breaker protection panel to be replaced through another side circuit breaker and the middle circuit breaker; If the circuit breaker protection panel to be replaced is the middle circuit breaker protection panel, then supply power to the first line and the second line respectively from the first bus and the second bus through their respective adjacent side circuit breakers.

4. A method for replacing and inspecting a circuit breaker protection panel with a 3 / 2 wiring, as claimed in claim 1, wherein The specific operation of checking each phase of the circuit breaker to be inspected is: Put in the single-phase trip outlet pressure plate of the circuit breaker, put in the starting single-phase failure and reclosing pressure plate of the circuit breaker, the line protection panel acts, trips the corresponding phase, and obtain the inspection result of the corresponding phase according to the action of the circuit breaker to be detected, and check another phase until the inspection results of the single-phase of each phase are obtained.

5. The replacement inspection method for the breaker protection panel with 3 / 2 wiring according to claim 4, characterized in that, The specific operation of checking another phase is: after waiting for a preset time, check another phase; the preset time is not less than the sum of the reclosing charging time, the line protection action time, and the circuit breaker tripping time.

6. A method for replacing and inspecting a circuit breaker protection panel with a 3 / 2 wiring, as claimed in claim 1, wherein The specific operation of repairing the circuit breaker protection panel to be inspected according to the inspection results is: According to the inspection results, determine whether the circuit breaker trips correctly and the reclosing switch recloses successfully. If not, repair the corresponding phases of the circuit breaker protection screen and recheck the repaired phases until all phases of the circuit breaker protection screen can trip correctly and the reclosing switch recloses successfully.

7. A method for replacing and inspecting a circuit breaker protection panel with a 3 / 2 wiring, as claimed in claim 4, wherein Before inspecting each phase of the circuit breaker to be inspected respectively, the method includes: Check whether the line protection panel can correctly issue a single-phase tripping command, and whether it can correctly issue a reclosing output signal after issuing a single-phase tripping command; if the single-phase tripping command is not issued correctly or the reclosing output signal is not issued, the line protection panel and the corresponding secondary circuit need to be inspected and repaired.

8. A method for replacing and inspecting a circuit breaker protection panel with a 3 / 2 wiring, as claimed in claim 1, wherein The specific method of connecting each phase of the line protection screen in the inspection state to the opening position of each phase of the circuit breaker protection screen to be inspected is: the line protection screen is connected to the opening position, tripping circuit, starting failure, remote tripping and locked reclosing circuit of phase A, phase B and phase C of the circuit breaker protection screen to be inspected, and the circuit breaker is placed in the closed state.

9. The replacement inspection method for the breaker protection panel with 3 / 2 wiring according to claim 1, characterized in that, Before setting each line protection screen to the inspection state in turn, the following steps are also included: Obtain the collected data of multiple line protection screens of the adjacent lines of the circuit breaker to be inspected, and compare the collected data of each line protection screen according to a preset ratio. If the difference in the collected data of each line protection screen on the same line is greater than the preset ratio, the line protection screen on the line is repaired.

10. The method for replacing and inspecting a circuit breaker protection panel with a 3 / 2 wiring according to claim 1, wherein After all the line protection screens have completed the inspection of the circuit breaker protection screen to be inspected, the circuit breaker protection screen to be inspected is put into operation, including: If the circuit breaker protection screen to be replaced is a middle circuit breaker protection screen, after the line protection screens of the first line and the second line have completed the inspection of the circuit breaker protection screen to be inspected, the circuit breaker protection screen to be inspected is put into operation.

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