Secondary circuit live working practice platform and implementation method thereof

Abstract

The application discloses a secondary circuit live working practical training platform and an implementation method thereof. The platform comprises a CT circuit practical training platform, a PT circuit practical training platform and an outlet circuit practical training platform. The CT circuit practical training platform, the PT circuit practical training platform and the outlet circuit practical training platform are all provided with operation handles of "safety measure starting" and "safety measure restoring" for process switching, and the related safety measure operations are prompted through indicator lights. The CT circuit practical training platform is used for monitoring the safety measure operations and the safety measure restoring process of the control cabinet and the protection cabinet. The safety measure operations and the safety measure restoring process of the protection cabinet include two conditions of single CT series single protection and single CT series multi-stage protection. The PT circuit practical training platform is used for monitoring the safety measure operations and the safety measure restoring process of the PT secondary circuit in which the air switch is pulled open or the short connecting piece of the internal and external terminals is cancelled. The outlet circuit practical training platform is used for monitoring the outlet pressure plate state.

Description

Technical Field

[0001] This invention relates to the field of live-line working on secondary circuits, specifically to a training platform for live-line working on secondary circuits and its implementation method. Background Technology

[0002] With the increasing maturity and standardization of relay protection equipment, the number of incorrect protection actions caused by problems with the protection devices themselves has decreased significantly. However, incidents involving defects in electrical secondary circuits that lead to equipment damage, escalation of accidents, and even impact on system safety and stability still occur frequently. Statistics show that equipment outages caused by defects in electrical secondary circuits account for 52.7% of all equipment outages caused by relay protection. Defects in electrical secondary circuits have many sources, including circuit design errors by protection manufacturers or design units, failure to follow design drawings during construction, and incomplete isolation of existing circuits during modifications. These can all lead to secondary circuit defects, creating hidden dangers that affect the normal operation of equipment. Problems in secondary circuits are not apparent during normal operation; they only become apparent after an accident occurs and the protection system operates. However, by then, the damage to the system and equipment is irreversible.

[0003] Currently, the detection of defects in electrical secondary circuits typically involves a combination of on-site inspection and whole-system transmission. However, this approach suffers from poor reliability and stability, and may even affect the normal operation of healthy equipment. Furthermore, these techniques are essentially remedial measures after a CT secondary open-circuit fault occurs; they can only narrow the scope of the accident and reduce its severity, but cannot effectively detect and prevent faults before they occur, posing a significant safety hazard to the stable operation of the power system. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a secondary circuit live-line working training platform and its implementation method to solve at least one of the above-mentioned technical problems.

[0005] According to one aspect of this invention, a secondary circuit live-line working training platform is provided, including a CT circuit training platform, a PT circuit training platform, and an outlet circuit training platform. The CT circuit training platform, PT circuit training platform, and outlet circuit training platform all switch between processes via operating handles that are configured with "safety measure start" and "safety measure resumption," and indicator lights provide prompts for relevant safety measure operations.

[0006] The CT circuit training platform is used to monitor the safety operation and recovery process of the control cabinet and protection cabinet. The safety operation and recovery process of the protection cabinet includes two cases: single CT in series with single protection and single CT in series with multi-level protection.

[0007] The PT circuit training platform is used to monitor the safety measures operation and safety measure recovery process in the PT secondary circuit, such as opening the circuit breaker or canceling the short connection of the internal and external terminals.

[0008] The export circuit training platform is used to monitor the status of the export pressure plate.

[0009] As a further technical solution, the safety operation procedure of the control cabinet includes: disconnecting the current loop connection piece of the control cabinet and short-circuiting the A, B, C, and N terminals of the CT measuring terminal; the procedure for restoring the safety measures is the reverse of the safety operation procedure.

[0010] As a further technical solution, in the case of a single CT connected in series with a single protection, the safety operation procedure of the protection cabinet includes: short-circuiting the outer terminals of current A, B, C, and N, disconnecting the short connecting piece between the inner and outer terminals of current A, B, C, and N, and connecting the test line to the inner terminal of current to increase the current; the procedure for restoring the safety is the reverse of the safety operation procedure.

[0011] As a further technical solution, in the two cases of single CT series multi-level protection, the safety operation procedure of the protection cabinet includes: shorting the current input and output terminals according to phase, shorting the outer terminals of AA, BB, and CC, disconnecting the short connecting piece between the inner and outer terminals of current A, B, and C, where the N terminal is fixedly connected, and connecting the test line to the inner terminal of the current to increase the current; the procedure for restoring the safety is the reverse of the safety operation procedure.

[0012] As a further technical solution, the CT circuit training platform includes: multiple current test terminals, respectively used for monitoring the A-phase short-circuit, B-phase short-circuit, C-phase short-circuit, A-phase slider, B-phase slider, C-phase slider, N-phase slider, An-phase slider, Bn-phase slider, and Cn-phase slider; and multiple indicator lights, respectively used to indicate that the external short-circuit is not removed, the external terminal is not short-circuited, the test terminal slider is not connected, the test terminal slider is not disconnected, and the operation sequence is incorrect.

[0013] As a further technical solution, the PT circuit training platform includes: multiple voltage circuit test terminals, respectively used for monitoring the A-phase slider, B-phase slider, and C-phase slider; and multiple indicator lights, respectively used to indicate whether the voltage circuit test terminal slider is not connected or not disconnected.

[0014] According to one aspect of the present invention, a method for implementing a secondary circuit live-line working training platform is provided, which is implemented using the aforementioned platform. The method for implementing the CT circuit training platform during a single maintenance includes:

[0015] Ancuo Start Procedure:

[0016] Switch the operating handle to the "Safety Measures Start" position; the "Control Cabinet Terminal Slider Not Disconnected" indicator light will illuminate.

[0017] Disconnect the terminal sliders in the ABCN sequence; the "Control cabinet terminal not short-circuited" indicator light will illuminate.

[0018] After shorting the A, B, C, and N phase terminals on the outside of the control cabinet using jumper wires, the "Control Cabinet Terminal Not Shorted" indicator light will turn off; at this point, the safety procedure is complete.

[0019] Ancuo recovery process:

[0020] When the control handle is switched to the "Safety Measures Restored" position, the "Control Cabinet Terminal Shorting Wiring Not Removed" indicator light illuminates.

[0021] After disconnecting the shorting wires of phases A, B, C, and N on the outside of the control cabinet, the "Control cabinet terminal slider not connected" indicator light will illuminate.

[0022] Connect the terminal sliders in the NCBA sequence. The "Control Cabinet Terminal Slider Not Connected" indicator light will illuminate. At this point, the safety measures restoration work is complete.

[0023] According to one aspect of the present invention, a method for implementing a secondary circuit live-line working training platform is provided, which is implemented using the aforementioned platform. The method for implementing the CT circuit training platform during secondary maintenance includes:

[0024] Ancuo Start Procedure:

[0025] When the control handle is switched to the "Safety Measures Start" position, the "Outer Jumper Cable Not Shorted" indicator light will illuminate;

[0026] After shorting the external terminals of the protection panel with the jumper wire, the "Test terminal slider not disconnected" indicator light will illuminate.

[0027] Disconnect the slider of the test terminal; the "Test terminal slider not disconnected" indicator light will turn off. At this point, the secondary maintenance and safety measures for the CT circuit are complete.

[0028] Ancuo recovery process:

[0029] When the control handle is switched to the "Safety Measures Restored" position, the "Test Terminal Slider Not Connected" indicator light illuminates.

[0030] After connecting the test terminal slider, the "Outer jumper wire not shorted" indicator light will illuminate;

[0031] After the outer shorting wire is removed, the "Outer shorting wire not removed" indicator light goes out; at this point, the secondary maintenance and safety measures restoration work of the CT circuit is completed.

[0032] According to one aspect of the present invention, a method for implementing a secondary circuit live-line working training platform is provided, which is implemented using the aforementioned platform. The method for implementing the PT circuit training platform includes:

[0033] Ancuo Start Procedure:

[0034] When the control handle is switched to the "Safety Measures Start" position, the "Voltage Circuit Not Disconnected" indicator light will illuminate;

[0035] Pulling out the PT circuit breaker or disconnecting the PT terminal slider will turn off the "Voltage circuit not disconnected" indicator light; at this point, the PT circuit safety measures are complete.

[0036] Ancuo recovery process:

[0037] When the control handle is switched to the "Safety Measures Restored" position, the "Voltage Circuit Not Restored" indicator light will illuminate;

[0038] Close the PT circuit breaker or connect the PT terminal slider; the "Voltage circuit not restored" indicator light will turn off. At this point, the PT circuit safety restoration work is complete.

[0039] According to one aspect of the present invention, a method for implementing a secondary circuit live-line working training platform is provided, which is implemented using the aforementioned platform. The method for implementing the outlet circuit training platform includes:

[0040] Ancuo Start Procedure:

[0041] When the control handle is switched to the "Safety Measures Start" position, the "Outlet Pressure Plate Not Disconnected" indicator light will illuminate;

[0042] Disconnect the relevant outlet pressure plate; the "Outlet pressure plate not disconnected" indicator light will turn off. At this point, the outlet circuit safety measures are complete.

[0043] Ancuo recovery process:

[0044] When the control handle is switched to the "Safety Measures Restored" position, the "Outlet Pressure Plate Not Connected" indicator light will illuminate;

[0045] The relevant outlet pressure plate is activated, and the "Outlet pressure plate not connected" indicator light goes out; at this point, the outlet circuit safety measures restoration work is complete.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a training platform and implementation method for live-line operation of secondary circuits, which can realize the training and simulation of CT secondary circuits, PT secondary circuits and output circuits, and can effectively detect and prevent faults before they occur, thus providing a guarantee for the stable operation of the power system. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the cabinet structure according to an embodiment of the present invention.

[0048] Figures 2(a)-(c) are schematic diagrams of the monitoring logic of the protection cabinet and the control cabinet according to embodiments of the present invention.

[0049] Figure 3 This is a schematic diagram illustrating the implementation of a current loop safety measure according to an embodiment of the present invention.

[0050] Figure 4 This is a schematic diagram of the current loop 1 safety monitoring principle according to an embodiment of the present invention.

[0051] Figure 5 This is a schematic diagram of the current loop 2 safety monitoring principle according to an embodiment of the present invention.

[0052] Figure 6 This is a schematic diagram of the current loop 3 safety monitoring principle according to an embodiment of the present invention.

[0053] Figure 7 This is a schematic diagram illustrating the implementation of a voltage loop safety measure scheme according to an embodiment of the present invention.

[0054] Figure 8 This is a schematic diagram of the voltage loop safety monitoring principle according to an embodiment of the present invention.

[0055] Figure 9 This is a schematic diagram of the output loop implementation according to an embodiment of the present invention.

[0056] Figure 10 This is a schematic diagram of the monitoring principle for the safety measures of the exit loop according to an embodiment of the present invention.

[0057] Figure 11 This is a schematic diagram illustrating the maintenance of the stability control device according to an embodiment of the present invention.

[0058] Figures 12(a)-(b) are schematic diagrams of the operation box according to an embodiment of the present invention. Detailed Implementation

[0059] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] According to one aspect of this specification, a secondary circuit live-line working training platform is provided, including a CT circuit training platform, a PT circuit training platform, and an outlet circuit training platform. The CT circuit training platform, PT circuit training platform, and outlet circuit training platform all use control handles for "safety measure start" and "safety measure recovery" to switch processes, and indicator lights provide prompts for relevant safety measures. The CT circuit training platform is used to monitor the safety measures operation and recovery process of the control cabinet and protection cabinet. The safety measures operation and recovery process of the protection cabinet includes two scenarios: single CT series single protection and single CT series multi-level protection. The PT circuit training platform is used to monitor the safety measures operation and recovery process of opening the circuit breaker or canceling the short connection of internal and external terminals in the PT secondary circuit. The outlet circuit training platform is used to monitor the status of the outlet pressure plate.

[0061] Optionally, the cabinet structure of the protection cabinet is as follows: Figure 1 As shown, the monitoring logic of the protection cabinet and the control cabinet is shown in Figures 2(a)-(c).

[0062] Figure 1 The front of the cabinet has multiple knife switches, such as 1QK, ..., 7QK, which respectively indicate single CT protection maintenance activation / deactivation, CT cascade protection maintenance activation / deactivation, PT maintenance activation / deactivation, line outlet maintenance activation / deactivation, main transformer (bus differential) outlet maintenance activation / deactivation, side switch CT maintenance activation / deactivation, and middle switch CT maintenance activation / deactivation. The front of the cabinet also has multiple indicator lights, such as LED1, ..., LED11, which respectively indicate: current test terminal not short-circuited, current test terminal slider not disconnected, voltage test terminal slider not disconnected, outlet pressure plate not disconnected (line), outlet pressure plate not disconnected (main transformer, bus differential), terminal short-circuit wire not removed, current test terminal slider not connected, voltage test terminal slider not connected, outlet pressure plate not connected (line), outlet pressure plate not connected (main transformer, bus differential), and incorrect operation sequence.

[0063] like Figure 3-6 As shown, there are many types of CT circuit safety measures, which can be broadly categorized into two types: those implemented at the control center or those completed by the protection panel. Among them:

[0064] The general steps for implementing security measures for the control cabinet are as follows:

[0065] ① Disconnect the current loop connection piece of the control cabinet.

[0066] ② Short-circuit the A, B, C, and N terminals of the CT measuring terminal.

[0067] The steps for restoring safety measures are the reverse of those described above. These safety measures are applicable when the primary circuit of a CT (CT) on a 3 / 2 connection side or an interrupted circuit may be energized during maintenance, such as when maintaining a side CT or a middle CT in a one-and-a-half-connection situation.

[0068] The safety measures for the protection cabinet should be considered in two categories.

[0069] Scenario 1: Single CT in series with single protection, the overall procedure for implementing safety measures is generally as follows:

[0070] ① Short-circuit the outer terminals of current A, B, C, and N

[0071] ② Disconnect the short connecting piece between the inner and outer terminals of current terminals A, B, C, and N.

[0072] ③ Connect the test line to the inner current terminal to increase the current.

[0073] The steps for restoring safety measures are the reverse of those described above. These safety measures are applicable to situations involving primary and secondary maintenance of a single CT in series with a single protection device, such as maintenance of 220kV line protection or primary CT maintenance.

[0074] Scenario 2: Single CT in series with multi-stage protection. In this case, the maintenance of non-terminal protection is mainly considered, and the maintenance of terminal protection is the same as in Scenario 1 above. The overall steps for maintenance safety measures of non-terminal protection are generally as follows:

[0075] ① Short-circuit the current input and output terminals AA, BB, and CC in sequence. Short-circuit the outer terminals.

[0076] ② Disconnect the short connecting piece between the inner and outer terminals of current terminals A, B, and C (where terminal N is a fixed connection).

[0077] ③ Connect the test line to the inner current terminal to increase the current.

[0078] The steps for restoring safety measures are the reverse of those described above. The above safety measures are applicable to non-end-stage protection maintenance in a single-CT series multi-level protection configuration, such as... Figure 11 Maintenance of the stability control device, etc.

[0079] The CT circuit training platform is designed to monitor the operation and recovery process of the above three situations, and to provide indicator lights to prompt the relevant safety measures. A workflow operation switch handle is configured, including two states: "Safety Measures Start" and "Safety Measures Recovery".

[0080] Its implementation method is as follows Figure 3 As shown, where,

[0081] ① Each phase current uses 3 sets of test terminals for wiring, such as Figure 1ID1, ID2, and ID3 are all connected to Ia. External lines are connected to 1ID1, and internal lines are connected to 1ID3. These three terminals are "virtually shorted." The dashed lines in the diagram indicate that these three terminals are only virtually shorted; they are not actually shorted. (Note: The actual cabinet only has one set of terminals. The design with three sets of terminals is primarily for the purpose of training the cabinet's alarm function; these three sets of terminals are "virtually shorted.")

[0082] ② External terminals such as 1ID1, 1ID4, and 1ID7 are used to monitor whether the outer terminals are short-circuited; internal terminals such as 1ID2, 1ID5, 1ID8, and 1ID12 are used to monitor whether the terminal connecting piece is disconnected.

[0083] ③ The shaded areas of the terminals in the diagram are locked with screws; connecting test wires is not permitted.

[0084] ④ The short connecting pieces are fixedly installed in the shaded area of ​​the "rectangle" shown in the figure, such as 1ID2, 1ID5, and 1ID8 in the figure.

[0085] ⑤ The implementation method of CT circuit safety measures is similar, and its schematic diagram is as follows: Figure 4-6 As shown.

[0086] Optionally, during PT secondary circuit commissioning, the safety measures for the PT secondary circuit are generally: opening the circuit breaker or removing the short-circuit connections between the internal and external terminals. The design concept of the PT circuit training platform is to monitor the above situations and prompt relevant safety measures through indicator lights. The workflow operation switch handle is set to include two states: "Safety Measures Start" and "Safety Measures Resume".

[0087] Its implementation method is as follows Figure 7 As shown, where,

[0088] ① Each phase uses two sets of test terminals for wiring, as shown in Figure UD7 and UD8, both connected to Ua. The external line is connected to UD7, and the internal line is connected to UD8. The two terminals are "virtually short-circuited." The part indicated by the dashed line in the figure represents a false short circuit between the two terminals; they are not actually short-circuited. (Note: The actual control panel only has one set of terminals. The design of two sets of terminals is mainly for the alarm function design of the control panel during training; the two sets of terminals are "virtually short-circuited.")

[0089] ②External terminals of UD7, UD9, and UD11, and internal terminals of UD8, UD10, and UD12.

[0090] ③ The shaded areas of the terminals in the diagram are locked with screws; connecting test wires is not permitted.

[0091] ④ The short connecting pieces are fixedly installed in the shaded area of ​​the "rectangle" shown in the figure, such as UD7, UD9, and UD11 in the figure.

[0092] The operating principle diagram of the voltage circuit safety measures is as follows: Figure 8 As shown.

[0093] The typical safety measure for the output circuit is to deactivate the protection output switch. Therefore, the training platform is designed to monitor the status of the output switch. Two main types of output switches are considered: 1. Line protection output (phase-specific); 2. Main transformer or busbar protection output (three-phase). Indicator lights will display relevant safety measures during operation or recovery. A workflow operation switch handle is configured, including both "Safety Measures Start" and "Safety Measures Resume" states.

[0094] Note: Busbar protection and main transformer protection are both three-phase outputs, and their safety measures are similar, so they are considered under the same category.

[0095] Its implementation method is as follows Figure 9 As shown, where,

[0096] ① Use 1CJ to 5CJ relays to monitor the line protection output pressure plate or the main transformer and bus protection outputs respectively. The relay contact status will prompt the relevant operation steps of the safety measures.

[0097] The operating principle diagram of the voltage circuit safety measures is as follows: Figure 10 As shown.

[0098]

[0099] The control panels and indicator lights involved are shown in the table above. Different safety measures are used for different maintenance scenarios. The following sections will introduce the safety measures for each maintenance situation.

[0100] CT circuit

[0101] I. CT Scanning Procedure

[0102] For any maintenance operation, it must be performed at the control cabinet, following the principle of disconnecting first and then shorting. The training platform implementation scheme is designed according to the start and recovery operations of maintenance safety measures.

[0103] (1) Side switch safety procedure:

[0104] ① When the switch is switched to the "Start" position during a single maintenance operation, the "Control Cabinet Terminal Slider Not Disconnected" indicator light will illuminate;

[0105] ② Disconnect the terminal sliders in the order ABCN. The "Control Cabinet Terminal Not Short-Circuited" indicator light will illuminate.

[0106] ③ After shorting the A, B, C, and N phase terminals on the outside of the control cabinet using jumper wires, the "Control Cabinet Terminal Not Shorted" indicator light will turn off.

[0107] At this point, the side switch safety measures are complete. If the above operation sequence is not followed during the process, the "Incorrect Operation Sequence Alarm" will be activated and an audible alarm will be sounded.

[0108] (2) Switch safety procedure:

[0109] ① When the switch is switched to the "Start" position during the first maintenance operation, the "Control Cabinet Terminal Slider Not Disconnected" indicator light will illuminate;

[0110] ② Disconnect the terminal sliders in the order ABCN. The "Control Cabinet Terminal Not Short-Circuited" indicator light will illuminate.

[0111] ③ After shorting the A, B, C, and N phase terminals on the outside of the control cabinet using jumper wires, the "Control Cabinet Terminal Not Shorted" indicator light will turn off.

[0112] At this point, the side switch safety measures are complete. If the above operation sequence is not followed during the process, the "Incorrect Operation Sequence Alarm" will be activated and an audible alarm will be sounded.

[0113] When resuming safety measures after a maintenance operation, the operation is performed at the control cabinet, following the "disassemble and reconnect" principle. The training platform implementation scheme is designed based on the start and end operations of maintenance safety measures.

[0114] (1) Restoration procedure for side switch safety measures:

[0115] ① When the switch is switched to the "Restore" position during a single maintenance operation, the "Short wires at the control cabinet terminals not removed" indicator light will illuminate;

[0116] ② After disconnecting the shorting wires of phases A, B, C, and N on the outside of the control cabinet, the "Control Cabinet Terminal Slider Not Connected" indicator light will illuminate.

[0117] ③ Connect the terminal sliders in the NCBA sequence. The "Control Cabinet Terminal Slider Not Connected" indicator light will illuminate.

[0118] At this point, the side switch safety measures restoration work is complete. If the above operation sequence is not followed during the process, the "Incorrect Operation Sequence Alarm" will be activated and an audible alarm will be sounded.

[0119] (2) Switch safety measure restoration procedure:

[0120] ① When the switch is switched to the "Restore" position during a primary maintenance operation, the "Short wires at the control cabinet terminals not removed" indicator light illuminates;

[0121] ② After disconnecting the shorting wires of phases A, B, C, and N on the outside of the control cabinet, the "Control Cabinet Terminal Slider Not Connected" indicator light will illuminate.

[0122] ③ Connect the terminal sliders in the NCBA sequence. The "Control Cabinet Terminal Slider Not Connected" indicator light will illuminate.

[0123] At this point, the safety measures restoration work of the switch is complete. If the above operation sequence is not followed during the process, the "Incorrect Operation Sequence Alarm" will be lit and an audible alarm will be sounded.

[0124] II. Secondary Overhaul Status

[0125] For secondary maintenance, safety measures are uniformly performed at the protection panel. The training platform implementation scheme is designed according to the start and recovery operations of maintenance safety measures.

[0126] (1) Secondary maintenance safety procedures

[0127] ① When the secondary current maintenance operation handle is switched to the "Start" position, the "Outer shorting wire not shorted" indicator light will illuminate;

[0128] ② After shorting the external terminals of the protection panel with the jumper wire, the "Test terminal slider not disconnected" indicator light will illuminate.

[0129] ③ Disconnect the slider of the test terminal; the "Test terminal slider not disconnected" indicator light will turn off.

[0130] At this point, the secondary maintenance and safety measures for the CT circuit are complete. If the above operating sequence is not followed during the process, the "Incorrect Operating Sequence Alarm" will be activated and an audible alarm will be sounded.

[0131] After the secondary safety measures are completed, a test current can be applied through the terminals inside the protection cabinet, and the applied current can be displayed on a digital ammeter.

[0132] (2) Secondary maintenance safety measure restoration process

[0133] ① When the secondary current maintenance operation handle is switched to the "Restore" position, the "Test terminal slider not connected" indicator light will illuminate;

[0134] ② After connecting the test terminal slider, the "Outer jumper wire not shorted" indicator light will illuminate.

[0135] ③ After the outer jumper wire is removed, the "Outer jumper wire not removed" indicator light will turn off.

[0136] At this point, the secondary maintenance and safety measures restoration work for the single CT order protection situation is completed. If the above operation sequence is not followed during the process, the "Incorrect Operation Sequence Alarm" will be lit and an audible alarm will be sounded.

[0137] In the case of secondary maintenance of CT, the safety measures for single CT with single protection are different from those for single CT with multiple protections, but the alarm prompting steps are the same.

[0138] PT circuit

[0139] (1) PT circuit maintenance safety procedures

[0140] ① When the voltage maintenance operation handle is switched to the "Start" position, the "Voltage circuit not disconnected" indicator light will illuminate.

[0141] ② Pull out the PT circuit breaker or disconnect the PT terminal slider, and the "Voltage circuit not disconnected" indicator light will turn off.

[0142] At this point, the PT circuit safety measures are complete. If the above operation sequence is not followed during the process, the "Incorrect Operation Sequence Alarm" will be activated and an audible alarm will sound.

[0143] After the secondary safety measures are completed, a test voltage can be applied through the terminals inside the protection cabinet, and the applied current can be displayed on a digital voltmeter.

[0144] (2) PT circuit maintenance and safety measures restoration process

[0145] ③ When the voltage maintenance operation handle is switched to the "Restore" position, the "Voltage circuit not restored" indicator light will illuminate.

[0146] ④ Close the PT circuit breaker or connect the PT terminal slider, and the "Voltage circuit not restored" indicator light will turn off.

[0147] At this point, the PT circuit safety measures restoration work is complete. If the above operation sequence is not followed during the process, the "Incorrect Operation Sequence Alarm" will be activated and an audible alarm will be sounded.

[0148] Export circuit

[0149] (1) Safety measures procedure for maintenance of the export circuit

[0150] ① When the export maintenance operation handle is switched to the "Start" position, the "Export pressure plate not disconnected" indicator light will illuminate.

[0151] ② Disconnect the relevant outlet pressure plate for protection; the "Outlet pressure plate not disconnected" indicator light will turn off.

[0152] With this, the safety measures for the export loop are complete.

[0153] (2) Export loop safety measure restoration process

[0154] ③ When the export maintenance operation handle is switched to the "Restore" position, the "Export pressure plate not connected" indicator light will illuminate.

[0155] ④ When the relevant outlet pressure plate is engaged, the "Outlet pressure plate not connected" indicator light will turn off.

[0156] With this, the work to restore safety measures on the export loop is complete.

[0157] As one implementation method, an operating circuit is designed, and a simulated circuit breaker (phase-by-phase), an operating box, and trip / close output buttons are configured to achieve operation simulation. The specific schematic diagrams are shown in Figures 12(a)-(b).

[0158] Figure 12(a) is used to simulate reclosing, reactivation relay, manual closing, three-phase tripping, DC power supply switching, and DC power supply monitoring. Figure 12(b) is used to simulate A-phase closing, B-phase closing, and C-phase closing, where each phase closing includes tripping monitoring, closing, and anti-tripping.

[0159] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A live-line working training platform for secondary circuits, characterized in that, This includes a CT circuit training platform, a PT circuit training platform, and an exit circuit training platform. Each of these platforms uses a control handle with "Safety Measures Start" and "Safety Measures Resume" functions for process switching, and indicator lights provide feedback on relevant safety measures. The CT circuit training platform includes: multiple current test terminals, respectively used for monitoring the A-phase short-circuit, B-phase short-circuit, C-phase short-circuit, A-phase slider, B-phase slider, C-phase slider, N-phase slider, An-phase slider, Bn-phase slider, and Cn-phase slider; and multiple indicator lights, respectively used to indicate that the external short-circuit is not removed, the external terminal is not short-circuited, the test terminal slider is not connected, the test terminal slider is not disconnected, and the operation sequence is incorrect. The CT circuit training platform is used to monitor the safety operation and recovery process of the control cabinet and protection cabinet. The safety operation procedure of the control cabinet includes: disconnecting the current circuit connection piece of the control cabinet and short-circuiting the CT measuring terminals A, B, C, and N. The recovery procedure is the reverse of the safety operation procedure. The safety operation and recovery process of the protection cabinet includes two cases: single CT series single protection and single CT series multi-level protection. In the case of single CT series single protection, the safety operation procedure of the protection cabinet includes: short-circuiting the outer terminals of current A, B, C, and N. First, disconnect the short connecting piece between the inner and outer terminals of current A, B, C, and N. Then, connect the test line to the inner terminal of the current and increase the current. The procedure for restoring the safety measure is the reverse of the safety measure operation procedure. In the case of single CT series multi-level protection, the safety measure operation procedure of the protection cabinet includes: shorting the current input and output terminals according to phase; shorting the outer terminals of AA, BB, and CC; disconnecting the short connecting piece between the inner and outer terminals of current A, B, and C, where the N terminal is fixedly connected; and connecting the test line to the inner terminal of the current and increasing the current. The procedure for restoring the safety measure is the reverse of the safety measure operation procedure. The PT circuit training platform includes: multiple voltage circuit test terminals, respectively used for monitoring the A-phase slider, B-phase slider, and C-phase slider; and multiple indicator lights, respectively used to indicate whether the voltage circuit test terminal slider is not connected or not disconnected; the PT circuit training platform is used to monitor the safety operation and safety restoration process of opening the circuit breaker or canceling the short connection of the internal and external terminals in the PT secondary circuit; The export circuit training platform is used to monitor the status of the export pressure plate.

2. The implementation method of the secondary circuit live-line working training platform, which adopts the platform described in claim 1, is characterized in that, The implementation method of the CT circuit training platform during a single maintenance includes: Ancuo Start Procedure: Switch the operating handle to the "Safety Measures Start" position; the "Control Cabinet Terminal Slider Not Disconnected" indicator light will illuminate. Disconnect the terminal sliders in the order ABCN; the "Control cabinet terminal not short-circuited" indicator light will illuminate. After shorting the A, B, C, and N phase terminals on the outside of the control cabinet using jumper wires, the "Control cabinet terminals not shorted" indicator light will turn off; at this point, the safety procedure is complete. Ancuo recovery process: When the control handle is switched to the "Safety Measures Restored" position, the "Control Cabinet Terminal Shorting Wiring Not Removed" indicator light illuminates. After disconnecting the shorting wires of phases A, B, C, and N on the outside of the control cabinet, the "Control cabinet terminal slider not connected" indicator light will illuminate. Connect the terminal sliders in the NCBA sequence. The "Control cabinet terminal slider not connected" indicator light will illuminate. At this point, the safety measures restoration work is complete.

3. The implementation method of the secondary circuit live-line working training platform, which adopts the platform described in claim 1, is characterized in that, The implementation method of the CT circuit training platform during secondary maintenance includes: Ancuo Start Procedure: When the control handle is switched to the "Safety Measures Start" position, the "Outer Jumper Cable Not Shorted" indicator light will illuminate; After shorting the external terminals of the protection panel with the jumper wire, the "Test terminal slider not disconnected" indicator light will illuminate. Disconnect the slider of the test terminal; the "Test terminal slider not disconnected" indicator light will turn off. At this point, the secondary maintenance and safety measures for the CT circuit are complete. Ancuo recovery process: When the control handle is switched to the "Safety Measures Restored" position, the "Test Terminal Slider Not Connected" indicator light will illuminate; After connecting the test terminal slider, the "Outer jumper wire not shorted" indicator light will illuminate; After the outer jumper wire is removed, the "Outer jumper wire not removed" indicator light goes out; at this point, the secondary maintenance and safety measures restoration work of the CT circuit is completed.

4. The implementation method of the secondary circuit live-line working training platform, which is implemented using the platform described in claim 1, is characterized in that, The implementation method of the PT loop training platform includes: Ancuo Start Procedure: When the control handle is switched to the "Safety Measures Start" position, the "Voltage Circuit Not Disconnected" indicator light will illuminate; Pull out the PT circuit breaker or disconnect the PT terminal slider; the "Voltage circuit not disconnected" indicator light will turn off. At this point, the PT circuit safety measures are complete. Ancuo recovery process: When the control handle is switched to the "Safety Measures Restored" position, the "Voltage Circuit Not Restored" indicator light illuminates; Close the PT circuit breaker or connect the PT terminal slider; the "Voltage circuit not restored" indicator light will turn off. At this point, the PT circuit safety restoration work is complete.

5. The implementation method of the secondary circuit live-line working training platform, which is implemented using the platform described in claim 1, is characterized in that, The implementation method of the export loop training platform includes: Ancuo Start Procedure: When the control handle is switched to the "Safety Measures Start" position, the "Outlet Pressure Plate Not Disconnected" indicator light will illuminate; Disconnect the relevant outlet pressure plate, and the "Outlet pressure plate not disconnected" indicator light will turn off; at this point, the outlet circuit safety measures are complete. Ancuo recovery process: Switch the control handle to the "Safety Measures Restored" position; the "Outlet Pressure Plate Not Connected" indicator light will illuminate. The relevant outlet pressure plate is activated, and the "Outlet pressure plate not connected" indicator light goes out; at this point, the outlet circuit safety measures restoration work is complete.

Images