A method and device for diagnosing a PT disconnection defect of a relay protection device and a medium

Abstract

The application discloses a kind of relay protection device PT wire break defect diagnosis method, device and medium.Method includes: in the acquisition secondary voltage of any one relay protection device report PT wire break condition, judge whether the relay protection device of acquisition same secondary voltage all report PT wire break;In the acquisition secondary voltage of same relay protection device all report PT wire break condition, judge whether the secondary voltage output measured at PT terminal box is normal, if secondary voltage output is not normal, determine that PT wire break defect is PT to terminal box secondary loop exception and PT failure;If secondary voltage output is normal, judge whether each section bus heavy voltage is normal, in the condition that each section bus heavy voltage is not normal, determine that PT wire break defect is PT terminal box to parallel screen secondary loop exception and switch auxiliary contact heavy secondary loop exception;In the condition that each section bus heavy voltage is normal, determine that PT wire break defect is voltage parallel relay fault and parallel secondary loop exception.

Description

Technical Field

[0001] This invention relates to the field of relay protection device technology, and more specifically, to a method, device, and medium for diagnosing PT (Power Transmission Device) open circuit defects in relay protection devices. Background Technology

[0002] According to typical design specifications, the secondary output voltage of the voltage transformer, after passing through the secondary voltage single-phase circuit breaker and PT disconnector positions in the PT terminal box or control cabinet, reaches the voltage paralleling device. The paralleling function is completed within the voltage paralleling panel and radiates to each protection panel. The voltage switching device within each protection panel switches to the bus voltage under the current operating mode via the bus disconnector position. Currently, when a PT experiences a disconnection anomaly, the fault point can be initially determined by the scope of the defect's impact. For example, if only a single bay protection device issues a PT disconnection alarm, the fault point should be concentrated on that bay device and its secondary circuit. If all protection devices on the same busbar throughout the station experience PT disconnection anomalies, the fault point should be concentrated on the busbar PTs, voltage paralleling devices, or common circuits. Therefore, current PT disconnection defect diagnosis relies on personnel experience. Because personnel are not familiar with the various possible defect locations of PT disconnections, the PT disconnection defect diagnosis process lacks comprehensiveness. This invention application, combining the various defect locations of PT disconnections obtained from the relay protection professional management system, proposes targeted investigation points, completely covering all possible defect locations of PT disconnections. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method, device, and medium for diagnosing PT (Power Transmission Device) open circuit defects in relay protection devices.

[0004] According to one aspect of the present invention, a method for diagnosing PT (Power Transmission Device) open circuit defects in a relay protection device is provided, comprising:

[0005] If any relay protection device that collects the secondary voltage reports a PT disconnection, determine whether all relay protection devices that collect the same secondary voltage report a PT disconnection.

[0006] If all relay protection devices that collect the same secondary voltage report PT disconnection, determine whether the secondary voltage output measured at the PT terminal box is normal. If the secondary voltage output measured at the PT terminal box is not normal, determine that the PT disconnection defect is an abnormality in the secondary circuit from the PT to the terminal box and a PT fault.

[0007] If the secondary voltage output measured at the PT terminal box is normal, determine whether the recirculation voltage of each bus section is normal. If the recirculation voltage of each bus section is abnormal, determine that the PT disconnection defect is an abnormality in the secondary circuit from the PT terminal box to the parallel panel and an abnormality in the recirculation secondary circuit of the switch auxiliary contact.

[0008] If the recirculation voltage of each bus section is normal, the PT disconnection defect is determined to be a fault in the voltage parallel relay and an abnormality in the parallel secondary circuit.

[0009] Optionally, it also includes:

[0010] If relay protection devices that collect the same secondary voltage do not report PT disconnection, determine whether the value collected by the relay protection device is consistent with the voltage before voltage switching. If the value collected by the relay protection device is inconsistent with the voltage before voltage switching, determine that the PT disconnection defect is an abnormality in the circuit from the PT terminal box to the voltage switching device.

[0011] If the voltage collected by the relay protection device is consistent with the voltage before the voltage switching, determine whether the voltage on the back panel of the protection device is consistent with the voltage sampled by the protection device. If the voltage on the back panel of the protection device is inconsistent with the voltage sampled by the protection device, determine that the PT disconnection defect is due to damage to the sampling board or CPU board of the protection device.

[0012] If the voltage on the backplane of the protection device is consistent with the voltage sampled by the protection device, determine whether the actual value sampled by the relay protection device is consistent with the voltage after voltage switching. If the actual value sampled by the relay protection device is inconsistent with the voltage after voltage switching, determine that the PT disconnection defect is an abnormality of the secondary circuit after voltage switching.

[0013] If the actual measured value of the relay protection device is consistent with the voltage after voltage switching, determine whether the input circuit is abnormal. If the input circuit is abnormal, determine whether the auxiliary contact of the disconnect switch is abnormal. If the auxiliary contact of the disconnect switch is abnormal, determine that the PT disconnection defect is an abnormal or loose connection of the auxiliary contact of the disconnect switch.

[0014] If there is no abnormality in the auxiliary contacts of the disconnect switch, determine whether the DC secondary circuit is abnormal. If the DC secondary circuit is abnormal, determine that the PT disconnection defect is the DC secondary circuit abnormality.

[0015] If there are no abnormalities in the DC secondary circuit, the PT disconnection defect is determined to be an abnormality of the voltage switching device.

[0016] Optionally, it also includes:

[0017] If there is no abnormality in the input circuit, determine whether the voltage switching circuit is abnormal. If the voltage switching circuit is abnormal, determine that the PT disconnection defect is a loose connection or open circuit in the voltage switching circuit.

[0018] If there are no abnormalities in the voltage switching circuit, the PT disconnection defect is determined to be an abnormality of the voltage switching device.

[0019] Optionally, the abnormality of the input circuit includes: simultaneous operation of switching relays, and no knife switch position indication during normal operation.

[0020] Optionally, DC secondary circuit abnormalities include: incorrect DC secondary circuit wiring, loose / open circuit in the DC secondary circuit, and incorrect DC power supply polarity.

[0021] Optionally, voltage switching circuit malfunctions include: incorrect wiring of the voltage switching circuit and loose connection / open circuit of the voltage switching circuit.

[0022] According to another aspect of the present invention, a PT (Power Transmission Device) open circuit defect diagnostic device is provided, comprising:

[0023] The judgment module is used to determine whether all relay protection devices that collect the same secondary voltage report PT disconnection when any relay protection device that collects the secondary voltage reports PT disconnection.

[0024] The first judgment module is used to determine whether the secondary voltage output measured at the PT terminal box is normal when all relay protection devices that collect the same secondary voltage report PT disconnection. If the secondary voltage output measured at the PT terminal box is not normal, the PT disconnection defect is determined to be an abnormality in the secondary circuit from the PT to the terminal box and a PT fault.

[0025] The second judgment module is used to determine whether the recirculation voltage of each bus section is normal if the secondary voltage output measured at the PT terminal box is normal. If the recirculation voltage of each bus section is abnormal, the PT disconnection defect is determined to be an abnormality in the secondary circuit from the PT terminal box to the parallel panel and an abnormality in the recirculation secondary circuit of the switch auxiliary contact.

[0026] The third judgment module is used to determine whether the PT disconnection defect is a voltage parallel relay fault or a parallel secondary circuit abnormality when the recirculation voltage of each bus section is normal.

[0027] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the methods described in any of the above aspects of the present invention.

[0028] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the method described in any of the preceding aspects of the present invention.

[0029] Therefore, the PT disconnection defect diagnosis method proposed in this invention is more comprehensive than the existing defect diagnosis process. It covers the common defect locations of "PT disconnection" defects in the field and can provide more sufficient guidance for the diagnosis of "PT disconnection" defects in relay protection. Attached Figure Description

[0030] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0031] Figure 1 This is a flowchart illustrating a method for diagnosing PT disconnection defects in a relay protection device provided by an exemplary embodiment of the present invention.

[0032] Figure 2 This is a complete diagram of the PT secondary circuit provided in an exemplary embodiment of the present invention;

[0033] Figure 3 This is a detailed diagram of a voltage switching circuit provided in an exemplary embodiment of the present invention;

[0034] Figure 4a , 4b This is a voltage parallel circuit diagram provided in an exemplary embodiment of the present invention;

[0035] Figure 5 This is another flowchart illustrating the method for diagnosing PT disconnection defects in a relay protection device provided in an exemplary embodiment of the present invention;

[0036] Figure 6 This is a flowchart of PT disconnection defect diagnosis in an exemplary embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of a PT disconnection defect diagnosis device provided in an exemplary embodiment of the present invention;

[0038] Figure 8 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. Detailed Implementation

[0039] Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0040] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0041] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0042] It should also be understood that in the embodiments of the present invention, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0043] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more unless explicitly defined or given contrary instructions in the context.

[0044] Furthermore, the term "and / or" in this invention is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0045] It should also be understood that the description of the various embodiments in this invention emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0046] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0047] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0048] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0050] The embodiments of this invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate together with a wide range of other general-purpose or special-purpose computing system environments or configurations. Well-known examples of terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments including any of the above systems, etc.

[0051] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are executed by remote processing devices linked through communication networks. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0052] Exemplary methods

[0053] Figure 1 This is a schematic flowchart illustrating a method for diagnosing PT (Power Transmission Device) open-circuit defects according to an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as... Figure 1 As shown, the method 100 for diagnosing PT (Power Transmission Device) open circuit defects includes the following steps:

[0054] Step 101: If any relay protection device that collects the secondary voltage reports a PT disconnection, determine whether all relay protection devices that collect the same secondary voltage report a PT disconnection.

[0055] Step 102: If all relay protection devices that collect the same secondary voltage report PT disconnection, determine whether the secondary voltage output measured at the PT terminal box is normal. If the secondary voltage output measured at the PT terminal box is not normal, determine that the PT disconnection defect is an abnormality in the secondary circuit from the PT to the terminal box and a PT fault.

[0056] Step 103: If the secondary voltage output measured at the PT terminal box is normal, determine whether the recirculation voltage of each bus section is normal. If the recirculation voltage of each bus section is abnormal, determine that the PT disconnection defect is an abnormality in the secondary circuit from the PT terminal box to the parallel panel and an abnormality in the recirculation secondary circuit of the switch auxiliary contact.

[0057] Step 104: If the recirculation voltage of each bus section is normal, determine that the PT disconnection defect is a voltage parallel relay fault and a parallel secondary circuit abnormality.

[0058] Optionally, it also includes:

[0059] If relay protection devices that collect the same secondary voltage do not report PT disconnection, determine whether the value collected by the relay protection device is consistent with the voltage before voltage switching. If the value collected by the relay protection device is inconsistent with the voltage before voltage switching, determine that the PT disconnection defect is an abnormality in the circuit from the PT terminal box to the voltage switching device.

[0060] If the voltage collected by the relay protection device is consistent with the voltage before the voltage switching, determine whether the voltage on the back panel of the protection device is consistent with the voltage sampled by the protection device. If the voltage on the back panel of the protection device is inconsistent with the voltage sampled by the protection device, determine that the PT disconnection defect is due to damage to the sampling board or CPU board of the protection device.

[0061] If the voltage on the backplane of the protection device is consistent with the voltage sampled by the protection device, determine whether the actual value sampled by the relay protection device is consistent with the voltage after voltage switching. If the actual value sampled by the relay protection device is inconsistent with the voltage after voltage switching, determine that the PT disconnection defect is an abnormality of the secondary circuit after voltage switching.

[0062] If the actual measured value of the relay protection device is consistent with the voltage after voltage switching, determine whether the input circuit is abnormal. If the input circuit is abnormal, determine whether the auxiliary contact of the disconnect switch is abnormal. If the auxiliary contact of the disconnect switch is abnormal, determine that the PT disconnection defect is an abnormal or loose connection of the auxiliary contact of the disconnect switch.

[0063] If there is no abnormality in the auxiliary contacts of the disconnect switch, determine whether the DC secondary circuit is abnormal. If the DC secondary circuit is abnormal, determine that the PT disconnection defect is the DC secondary circuit abnormality.

[0064] If there are no abnormalities in the DC secondary circuit, the PT disconnection defect is determined to be an abnormality of the voltage switching device.

[0065] Optionally, it also includes:

[0066] If there is no abnormality in the input circuit, determine whether the voltage switching circuit is abnormal. If the voltage switching circuit is abnormal, determine that the PT disconnection defect is a loose connection or open circuit in the voltage switching circuit.

[0067] If there are no abnormalities in the voltage switching circuit, the PT disconnection defect is determined to be an abnormality of the voltage switching device.

[0068] Optionally, the abnormality of the input circuit includes: simultaneous operation of switching relays, and no knife switch position indication during normal operation.

[0069] Optionally, DC secondary circuit abnormalities include: incorrect DC secondary circuit wiring, loose / open circuit in the DC secondary circuit, and incorrect DC power supply polarity.

[0070] Optionally, voltage switching circuit malfunctions include: incorrect wiring of the voltage switching circuit and loose connection / open circuit of the voltage switching circuit.

[0071] Specifically, the main defect locations of the "PT open circuit" defect are shown in Table 1. Different rows in Table 1 represent different possible defect locations for each "PT open circuit" defect. As shown in Table 1, there are a total of 13 main defect locations for the "PT open circuit" defect. For ease of analysis, each defect location is labeled with a single English letter, as indicated by the underlined letters next to each defect location in Table 1.

[0072] Table 1. Locations of each defect in the "PT disconnection" defect.

[0073]

[0074]

[0075] The specific locations of each defect are shown in Table 1. Figure 2 , Figure 3 As shown in Figure 4. Among them, Figure 2 The diagram shows the overall configuration of the PT secondary circuit, and marks the locations of the four defective parts in Table 1 (damage to the protection device sampling board or CPU board W, abnormality in the circuit from the PT terminal box to the voltage switching device C, abnormality in the secondary circuit from the PT to the terminal box Y, and PT fault N). Figure 3 Figure 4 is Figure 2 Detailed expanded view of the switching / side-by-side screens. Among them, Figure 3 Figure 1 shows a detailed diagram of the voltage switching circuit, marking the locations of the six defective areas in Table 1 (PT terminal box to voltage switching device circuit abnormality C, secondary circuit abnormality after voltage switching B, voltage switching circuit loose connection / open circuit E, voltage switching device G, disconnector auxiliary contact abnormality or loose connection U, DC secondary circuit abnormality X). Figure 4 shows a detailed diagram of the voltage parallel circuit, marking the specific locations of the four defective areas in Table 1 (PT terminal box to parallel panel secondary circuit abnormality M, disconnector auxiliary contact and other re-operation secondary circuit abnormality L, voltage parallel relay fault H, circuit breaker auxiliary contact, parallel handle and other parallel secondary circuit abnormalities J).

[0076] In addition, voltage recirculation: maintains the correspondence between the presence / absence of the PT secondary voltage and the operating state (engaged / disabled) of the transformer primary, preventing personal injury and equipment accidents caused by the secondary winding feeding back power to the primary winding when the PT primary is out of operation.

[0077] The flowchart for defect diagnosis is as follows: Figure 5 As shown. Figure 5 In addition to covering the 13 defect locations in Table 1, it also includes... Figure 5 In addition to the content within the middle oval frame, it also contains 10 investigation points. Figure 5 (The content within the diamond-shaped box) These 10 checkpoints can be used to determine the specific location of the defect. Figure 5Therefore, the first step is to classify the defect location based on whether the reported PT disconnection self-test alarm is from a single relay protection device or multiple relay protection devices. When only one relay protection device reports a PT disconnection, the defect location is in the device's switching circuit, its own circuit, and on the device itself (e.g., ...). Figure 5 (See the entity frame range reasoning flow); When multiple relay protection devices report PT disconnection, the defect location is on the PT, voltage common circuit, or parallel circuit (e.g., Figure 5 (The reasoning process within the dashed box is shown below). According to... Figure 5 The diagnostic process is executed sequentially to complete the diagnosis of the "PT disconnection" defect. Figure 5 Within the dashed box, a defect checkpoint shows multiple defect diagnosis locations, indicating that personnel need to further inspect each possible defect location individually in order to ultimately determine the defect location.

[0078] Figure 5 It contains 10 inspection points, and based on the results returned from these points, 13 defect locations were identified. Specifically, the first step is to check whether all protection devices collecting this voltage report a PT disconnection. If so, proceed to... Figure 5 The branch indicated by the dashed box in the middle; otherwise, proceed to... Figure 5 The branch shown in the solid box.

[0079] Entering the branch shown in the dashed box, first check the point "Is the secondary voltage output at the PT terminal box normal?". Based on the feedback result, if no, two defective parts are obtained: "PT to terminal box secondary circuit abnormality Y" and "PT fault N". If yes, then further check the point "Is the re-circuit voltage of each bus section normal?". Based on the feedback result, if yes, two defective parts are obtained: "Voltage parallel relay fault H" and "Circuit breaker auxiliary contacts, parallel handles, and other parallel secondary circuit abnormalities J". If no, two defective parts are obtained: "PT terminal box to parallel panel secondary circuit abnormality M" and "Disconnector auxiliary contacts and other re-circuit secondary circuit abnormalities L".

[0080] Among them, the re-energized voltage of each bus section is the voltage at different locations after the voltage transformer transforms the voltage to the secondary side.

[0081] Enter the branch shown in the solid line box and sequentially execute "Is the actual measured value of the device consistent with the voltage before voltage switching?", "Is the backplane voltage consistent with the protection sampling?", "Is the actual measured value of the device consistent with the voltage after voltage switching?". If not, three defect locations are obtained respectively: "Abnormal circuit from PT terminal box to voltage switching device C", "Damaged sampling board or CPU board of protection device W", and "Abnormal secondary circuit after voltage switching B". If all are yes, proceed to the next troubleshooting point.

[0082] The process begins by checking the "Is the input circuit abnormal?" checkpoint. If the response is yes, the next step is "Is the voltage switching circuit abnormal?". Based on the feedback, the defective parts are identified as "Voltage switching circuit open / loose connection E" (yes) and "Voltage switching device G" (no). If the response is no, the process continues by checking the "Auxiliary contact of disconnector abnormal?" and "DC secondary circuit abnormal?" checkpoints. If yes, the defective parts are identified as "Auxiliary contact of disconnector abnormal or loose connection U" and "DC secondary circuit abnormal X". If both are no, the defective part is identified as "Voltage switching device G".

[0083] Figure 5 In the above, "whether the input circuit is abnormal" specifically refers to: whether the switching relays operate simultaneously or whether there is no knife switch position indication during normal operation; "voltage switching circuit abnormal" specifically refers to: 1. incorrect wiring of the voltage switching circuit; 2. loose connection / open circuit of the voltage switching circuit; "DC secondary circuit abnormal" specifically refers to: 1. incorrect wiring of the DC secondary circuit; 2. loose connection / open circuit of the DC secondary circuit; 3. incorrect polarity of the DC power supply.

[0084] In addition, the abnormal handling process of the "PT disconnection" protection device of the 220kV II bus of a 220kV substation is selected as a case to illustrate in detail the effectiveness of the "PT disconnection" defect diagnosis process of this invention.

[0085] On [Date], the secondary maintenance personnel received a notification from the operations personnel that all protection devices belonging to the 220kV II busbar reported "PT disconnection". Based on this invention application... Figure 5 The secondary maintenance personnel made a judgment based on the on-site situation. Since multiple bays showed abnormalities in the protection devices, the abnormality of the protection devices was ruled out, and it could be basically determined that there was an abnormality in the secondary voltage circuit.

[0086] The secondary maintenance personnel first measured the secondary voltage output at the PT terminal box, finding it normal, thus confirming that the secondary voltage output within the PT control cabinet was normal. Next, they determined that the bus recirculation voltage was abnormal, specifically the A-phase voltage was inconsistent before and after the disconnector switching. The possible defect was identified as either "abnormality M in the secondary circuit from the PT terminal box to the parallel panel" or "abnormality L in the recirculation secondary circuit, such as the disconnector auxiliary contact." Based on this, the operations personnel further diagnosed the defect as "abnormality L in the recirculation secondary circuit, such as the disconnector auxiliary contact," specifically an abnormality in the PT disconnector auxiliary contact within the 220kV IVII bus voltage circuit. After replacing the disconnector auxiliary contact, all station equipment returned to normal operation. Figure 5 The detailed process for diagnosing the "PT disconnection" defect in this case is as follows: Figure 6 As shown, the PT disconnection defect is determined to be an abnormality L in the secondary circuit of the switch auxiliary contact.

[0087] Therefore, the "PT open circuit" defect diagnosis flowchart proposed in this invention application is more comprehensive than existing defect diagnosis flowcharts. It encompasses common defect locations of "PT open circuit" defects in the field and can provide more thorough guidance for diagnosing "PT open circuit" defects in relay protection.

[0088] Exemplary device

[0089] Figure 7 This is a schematic diagram of the structure of a PT (Power Transmission Device) open circuit defect diagnosis device provided in an exemplary embodiment of the present invention. Figure 7 As shown, the device 700 includes:

[0090] The judgment module 710 is used to determine whether all relay protection devices that collect the same secondary voltage report PT disconnection when any relay protection device that collects the secondary voltage reports PT disconnection.

[0091] The first judgment module 720 is used to determine whether the secondary voltage output measured at the PT terminal box is normal when all relay protection devices that collect the same secondary voltage report PT disconnection. If the secondary voltage output measured at the PT terminal box is not normal, the PT disconnection defect is determined to be an abnormality in the secondary circuit from the PT to the terminal box and a PT fault.

[0092] The second judgment module 730 is used to determine whether the recirculation voltage of each bus section is normal if the secondary voltage output measured at the PT terminal box is normal. If the recirculation voltage of each bus section is abnormal, the PT disconnection defect is determined to be an abnormality in the secondary circuit from the PT terminal box to the parallel panel and an abnormality in the recirculation secondary circuit of the switch auxiliary contact.

[0093] The third judgment module 740 is used to determine whether the PT disconnection defect is a voltage parallel relay fault or a parallel secondary circuit abnormality when the recirculation voltage of each bus section is normal.

[0094] Optionally, the device 700 also includes:

[0095] The fourth judgment module is used to determine whether the value collected by the relay protection device is consistent with the voltage before the voltage switching when the relay protection device reports PT disconnection in cases where the relay protection device collects the same secondary voltage but the voltage before the voltage switching is inconsistent. If the value collected by the relay protection device is inconsistent with the voltage before the voltage switching, the PT disconnection defect is determined to be an abnormality in the circuit from the PT terminal box to the voltage switching device.

[0096] The fifth judgment module is used to determine whether the voltage on the back panel of the protection device is consistent with the voltage before the voltage switching when the voltage collected by the relay protection device is consistent with the voltage before the voltage switching. If the voltage on the back panel of the protection device is inconsistent with the voltage sampled by the protection device, the module determines that the PT disconnection defect is due to damage to the protection device sampling board or CPU board.

[0097] The sixth judgment module is used to determine whether the actual value of the relay protection device is consistent with the voltage after voltage switching when the back panel voltage of the protection device is consistent with the sampling voltage of the protection device. When the actual value of the relay protection device is inconsistent with the voltage after voltage switching, the PT disconnection defect is determined to be an abnormality of the secondary circuit after voltage switching.

[0098] The seventh judgment module is used to determine whether the input circuit is abnormal when the actual value of the relay protection device is consistent with the voltage after voltage switching. If the input circuit is abnormal, it is used to determine whether the auxiliary contact of the disconnect switch is abnormal. If the auxiliary contact of the disconnect switch is abnormal, it is used to determine whether the PT disconnection defect is an abnormality or a loose connection of the auxiliary contact of the disconnect switch.

[0099] The eighth judgment module is used to determine whether the DC secondary circuit is abnormal when there is no abnormality in the auxiliary contact of the disconnect switch, and to determine the PT open circuit defect as a DC secondary circuit abnormality when the DC secondary circuit is abnormal.

[0100] The ninth judgment module is used to determine that the PT open circuit defect is an abnormality of the voltage switching device when there is no abnormality in the DC secondary circuit.

[0101] Optionally, the device 700 also includes:

[0102] The tenth judgment module is used to determine whether the voltage switching circuit is abnormal when there is no abnormality in the input circuit. If the voltage switching circuit is abnormal, the PT disconnection defect is determined to be a loose connection or open circuit in the voltage switching circuit.

[0103] The eleventh judgment module is used to determine that the PT disconnection defect is an abnormality of the voltage switching device when there is no abnormality in the voltage switching circuit.

[0104] Optionally, abnormal input circuits include: simultaneous operation of switching relays, and no knife switch position indication during normal operation.

[0105] Optionally, DC secondary circuit abnormalities include: incorrect DC secondary circuit wiring, loose / open circuit in the DC secondary circuit, and incorrect DC power supply polarity.

[0106] Optionally, voltage switching circuit malfunctions include: incorrect wiring of the voltage switching circuit and loose connection / open circuit of the voltage switching circuit.

[0107] Exemplary electronic devices

[0108] Figure 8 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. For example... Figure 8 As shown, the electronic device 80 includes one or more processors 81 and memory 82.

[0109] The processor 81 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0110] The memory 82 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 81 may execute the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above, and / or other desired functions. In one example, the electronic device may also include an input device 83 and an output device 84, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0111] In addition, the input device 83 may also include, for example, a keyboard, a mouse, etc.

[0112] The output device 84 can output various information to the outside. The output device 84 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0113] Of course, for the sake of simplicity, Figure 8 Only some of the components of this electronic device relevant to the present invention are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may include any other suitable components depending on the specific application.

[0114] Exemplary computer program products and computer-readable storage media

[0115] In addition to the methods and apparatus described above, embodiments of the present invention may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps in the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0116] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0117] Furthermore, embodiments of the present invention may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps of the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0118] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0119] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0120] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0121] The block diagrams of devices, systems, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0122] The methods and systems of the present invention may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, the present invention may also be implemented as a program recorded on a recording medium, the program comprising machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers recording media storing programs for performing the methods according to the present invention.

[0123] It should also be noted that in the systems, apparatus, and methods of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0124] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A method for diagnosing PT (Power Transmission Device) open-circuit defects in a relay protection device, characterized in that, include: If any relay protection device that collects the secondary voltage reports a PT disconnection, determine whether all relay protection devices that collect the same secondary voltage report a PT disconnection. If all relay protection devices that collect the same secondary voltage report PT disconnection, determine whether the secondary voltage output measured at the PT terminal box is normal. If the secondary voltage output measured at the PT terminal box is not normal, determine that the PT disconnection defect is an abnormality in the secondary circuit from the PT to the terminal box and a PT fault. If the secondary voltage output measured at the PT terminal box is normal, determine whether the recirculation voltage of each bus section is normal. If the recirculation voltage of each bus section is abnormal, determine that the PT disconnection defect is an abnormality in the secondary circuit from the PT terminal box to the parallel panel and an abnormality in the recirculation secondary circuit of the switch auxiliary contact. If the recirculation voltage of each bus section is normal, the PT disconnection defect is determined to be a voltage parallel relay fault and an abnormality in the parallel secondary circuit. If relay protection devices that collect the same secondary voltage do not report PT disconnection, determine whether the value collected by the relay protection device is consistent with the voltage before voltage switching. If the value collected by the relay protection device is inconsistent with the voltage before voltage switching, determine that the PT disconnection defect is an abnormality in the circuit from the PT terminal box to the voltage switching device. If the voltage collected by the relay protection device is consistent with the voltage before the voltage switching, determine whether the voltage on the back panel of the protection device is consistent with the voltage sampled by the protection device. If the voltage on the back panel of the protection device is inconsistent with the voltage sampled by the protection device, determine that the PT disconnection defect is a damage to the sampling board or CPU board of the protection device. If the voltage on the backplane of the protection device is consistent with the sampling voltage of the protection device, determine whether the actual sampling value of the relay protection device is consistent with the voltage after voltage switching. If the actual sampling value of the relay protection device is inconsistent with the voltage after voltage switching, determine that the PT disconnection defect is an abnormality of the secondary circuit after voltage switching. If the actual value of the relay protection device is consistent with the voltage after voltage switching, determine whether the input circuit is abnormal. If the input circuit is abnormal, determine whether the auxiliary contact of the disconnect switch is abnormal. If the auxiliary contact of the disconnect switch is abnormal, determine that the PT disconnection defect is an abnormal or loose connection of the auxiliary contact of the disconnect switch. If there is no abnormality in the auxiliary contact of the disconnect switch, determine whether the DC secondary circuit is abnormal, and if the DC secondary circuit is abnormal, determine that the PT disconnection defect is a DC secondary circuit abnormality. If there is no abnormality in the DC secondary circuit, the PT disconnection defect is determined to be an abnormality of the voltage switching device; If there is no abnormality in the input circuit, determine whether the voltage switching circuit is abnormal. If the voltage switching circuit is abnormal, determine that the PT disconnection defect is a loose connection or open circuit in the voltage switching circuit. If there is no abnormality in the voltage switching circuit, the PT disconnection defect is determined to be an abnormality of the voltage switching device.

2. The method according to claim 1, characterized in that, The abnormalities in the input circuit include: simultaneous operation of switching relays and no knife switch position indication during normal operation.

3. The method according to claim 1, characterized in that, DC secondary circuit abnormalities include: incorrect wiring of the DC secondary circuit, loose connection / open circuit of the DC secondary circuit, and incorrect polarity of the DC power supply.

4. The method according to claim 1, characterized in that, The voltage switching circuit malfunctions include: incorrect wiring of the voltage switching circuit and loose connection / open circuit of the voltage switching circuit.

5. A device for diagnosing PT (Power Transmission Device) open circuit defects in a relay protection device, characterized in that, include: The judgment module is used to determine whether all relay protection devices that collect the same secondary voltage report PT disconnection when any relay protection device that collects the secondary voltage reports PT disconnection. The first judgment module is used to determine whether the secondary voltage output measured at the PT terminal box is normal when all relay protection devices that collect the same secondary voltage report PT disconnection. If the secondary voltage output measured at the PT terminal box is not normal, the PT disconnection defect is determined to be an abnormality in the secondary circuit from the PT to the terminal box and a PT fault. The second determination module is used to determine whether the recirculation voltage of each bus section is normal if the secondary voltage output measured at the PT terminal box is normal. If the recirculation voltage of each bus section is abnormal, the PT disconnection defect is determined to be an abnormality in the secondary circuit from the PT terminal box to the parallel screen and an abnormality in the recirculation secondary circuit of the switch auxiliary contact. The third determination module is used to determine whether the PT disconnection defect is a voltage parallel relay fault or a parallel secondary circuit abnormality when the re-energized voltage of each bus section is normal. The fourth determination module is used to determine whether the value collected by the relay protection device is consistent with the voltage before the voltage switch when the relay protection device that collects the same secondary voltage reports PT disconnection. If the value collected by the relay protection device is inconsistent with the voltage before the voltage switch, the module determines that the PT disconnection defect is an abnormality in the circuit from the PT terminal box to the voltage switching device. The fifth determination module is used to determine whether the backplane voltage of the protection device is consistent with the sampling voltage of the protection device when the voltage collected by the relay protection device is consistent with the voltage before the voltage switching, and to determine whether the PT disconnection defect is due to damage to the sampling board or CPU board of the protection device when the backplane voltage of the protection device is inconsistent with the sampling voltage of the protection device. The sixth determination module is used to determine whether the actual value of the relay protection device is consistent with the voltage after voltage switching when the back plate voltage of the protection device is consistent with the sampling voltage of the protection device, and to determine that the PT disconnection defect is an abnormality of the secondary circuit after voltage switching when the actual value of the relay protection device is inconsistent with the voltage after voltage switching. The seventh determination module is used to determine whether the input circuit is abnormal when the actual value of the relay protection device is consistent with the voltage after voltage switching. If the input circuit is abnormal, it determines whether the auxiliary contact of the disconnect switch is abnormal. If the auxiliary contact of the disconnect switch is abnormal, it determines that the PT disconnection defect is an abnormal or loose connection of the auxiliary contact of the disconnect switch. The eighth determination module is used to determine whether the DC secondary circuit is abnormal when there is no abnormality in the auxiliary contact of the disconnector, and to determine whether the PT disconnection defect is a DC secondary circuit abnormality when the DC secondary circuit is abnormal. The ninth determination module is used to determine that the PT disconnection defect is a voltage switching device malfunction when there is no abnormality in the DC secondary circuit. If there is no abnormality in the input circuit, determine whether the voltage switching circuit is abnormal. If the voltage switching circuit is abnormal, determine that the PT disconnection defect is a loose connection or open circuit in the voltage switching circuit. If there is no abnormality in the voltage switching circuit, the PT disconnection defect is determined to be an abnormality of the voltage switching device.

6. The apparatus according to claim 5, characterized in that, The abnormalities in the input circuit include: simultaneous operation of switching relays and no knife switch position indication during normal operation.

7. The apparatus according to claim 5, characterized in that, DC secondary circuit abnormalities include: incorrect wiring of the DC secondary circuit, loose connection / open circuit of the DC secondary circuit, and incorrect polarity of the DC power supply.

8. The apparatus according to claim 5, characterized in that, The voltage switching circuit malfunctions include: incorrect wiring of the voltage switching circuit and loose connection / open circuit of the voltage switching circuit.

9. A computer-readable storage medium, characterized in that, The storage medium stores a computer program for performing the method described in any one of claims 1-4.

10. An electronic device, characterized in that, The electronic device includes: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1-4.

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