Electrical signal diagnosis method and system for mechanical tripping fault of on-load tap-changer mechanism

Abstract

The invention discloses an electrical signal diagnosis method and system for a mechanical tripping fault of an on-load tap-changer mechanism, and the method comprises the steps: building a time control signal model of a time control switch, generating a time sequence signal, building a tap-changer electromagnetic transient model under a normal working condition based on the time sequence signal and a tap-changer circuit physical model, and obtaining a standard electromagnetic transient characteristic; establishing a tapping switch tapping selector model, configuring a tapping selector and contact action time sequence in the tapping switch tapping selector model based on the electrical fault states of the main contact and the auxiliary contact, and establishing an electromagnetic transient model under the fault of the fault state; operating the under-fault electromagnetic transient model under the mechanical tripping fault of the tap switch mechanism to obtain a first fault electromagnetic transient characteristic; configuring a lightning arrester model between the stages of the tap switch, and obtaining a second fault electromagnetic transient characteristic; and diagnosing the mechanical tripping fault of the tap switch mechanism through the standard electromagnetic transient characteristic, the first fault electromagnetic transient characteristic and the second fault electromagnetic transient characteristic.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical engineering, more particularly, to an electrical signal diagnosis method and system for mechanical tripping failure of an on-load tap changer mechanism. BACKGROUND

[0002] An on-load tap changer (OLTC) is a key component for voltage regulation of a power transformer, which functions to change the turns ratio of the transformer winding without interrupting the load current, thereby maintaining the stability of the system voltage. With the continuous expansion of the power grid and the increasing capacity of renewable energy connected to the grid, the requirements for power supply reliability and power quality are continuously improving. The action reliability and operating state of the OLTC, as a regulating hub, are directly related to the stability and safety of the entire power system. However, as a complex mechanism combining mechanical power and electrical operation, the OLTC has a high failure rate among all components of the transformer. In particular, the core energy storage mechanism of the fast mechanism may experience mechanical tripping failure due to spring fatigue, lubrication failure, wear and tear of parts, or jamming, etc. during long-term service. Such failures often result in the inability of the contact action mechanism to reset, causing the tap selector to act under voltage during the next switching, and even causing inter-stage short circuits, which not only cause damage to the OLTC itself, but also may trigger internal short circuits of the transformer, insulation oil cracking, and other chain failures, seriously threatening the safe operation of the transformer. Currently, research and detection of OLTC failures are mostly focused on traditional electrical tests and offline diagnosis, which are difficult to truly reflect the electromagnetic transient behavior and failure evolution mechanism during dynamic switching. Due to the fast action speed of the OLTC, the process involves multiple couplings of mechanical-electrical-magnetic circuits, and the number of fault samples is small, making it extremely difficult to obtain fault data based on actual measurements. Therefore, reproducing the failure process through modeling and simulation has become an important research path. Electromagnetic transient simulation tools such as PSCAD / EMTDC provide a good platform for studying the OLTC switching process, which can accurately simulate the interaction process of power electronics, nonlinear elements, and complex control logic.

[0003] However, most existing OLTC models are focused on simulating normal switching processes, and modeling of electrical response characteristics under mechanical failure has not been systematically developed. In addition, whether overvoltage is generated between stages of the OLTC under fault conditions, and whether the energy absorption capacity of the arrester is sufficient, etc. also need to be evaluated in advance through simulation. SUMMARY

[0004] The technical scheme of the present application provides an electrical signal diagnosis method and system for mechanical tripping failure of an on-load tap changer mechanism, to solve the problem of how to diagnose the electrical signal of the mechanical tripping failure of the on-load tap changer mechanism.

[0005] To solve the above problems, the present application provides an electrical signal diagnosis method for mechanical tripping failure of a load tap changer mechanism, the method comprising:

[0006] A tap changer topology is selected, a vacuum tube, a main contact and an auxiliary contact are equivalent to a time-controlled switch, and a tap changer tripping failure simulation model is established;

[0007] The number of the time-controlled switch is defined, and a physical mapping relationship between the electrical state and mechanical action of the tap changer is established based on the number of the time-controlled switch;

[0008] Based on the tap changer topology and the physical mapping relationship, the electrical manifestation of the fast mechanism mechanical tripping failure is analyzed, the electrical fault state of the main contact and the auxiliary contact in the tap changer is obtained, and a tap changer circuit physical model is established;

[0009] A time-controlled signal model of the time-controlled switch is established, a time sequence signal is generated based on the tap changer normal switching time sequence through the time-controlled signal model, a normal working condition tap changer electromagnetic transient model is established based on the time sequence signal and the tap changer circuit physical model, and standard electromagnetic transient characteristics are obtained based on the tap changer electromagnetic transient model;

[0010] A tap changer selector model is established, the tap selector and contact action time sequence in the tap changer selector model is configured based on the electrical fault state of the main contact and the auxiliary contact, and a fault state fault electromagnetic transient model is established based on the tap selector and contact action time sequence and the tap changer electromagnetic transient model;

[0011] The fault electromagnetic transient model under the tap changer mechanism mechanical tripping failure is run to obtain first fault electromagnetic transient characteristics;

[0012] An arrester model is configured between tap changer stages to obtain second fault electromagnetic transient characteristics;

[0013] The tap changer mechanism mechanical tripping failure is diagnosed by comparing the standard electromagnetic transient characteristics, the first fault electromagnetic transient characteristics and the second fault electromagnetic transient characteristics.

[0014] Preferably, the number of the time-controlled switch is defined, and the physical mapping relationship between the electrical state and mechanical action of the tap changer is established based on the number of the time-controlled switch, wherein the number of the time-controlled switch is defined, comprising:

[0015] The number of the vacuum tube is defined as Vk, wherein the number of the parameter k and the code correspond to the mechanical action link of the tap changer;

[0016] The main contact number is defined as MCp, where the number and code of the numbering parameter p correspond to the mechanical action of the tap changer;

[0017] The auxiliary contact is numbered Zl, where the number and code of the numbering parameter l correspond to the mechanical action of the tap changer.

[0018] Preferably, the electromagnetic transient model under the mechanical tripping fault of the operating tap changer mechanism, to obtain the first fault electromagnetic transient characteristics, includes:

[0019] By configuring voltage and current probes, the first fault electromagnetic transient characteristics of the vacuum tube, the main contact, and the auxiliary contact are obtained.

[0020] Preferably, the step of configuring a surge arrester model between tap changer stages to obtain the second fault electromagnetic transient characteristics includes:

[0021] By configuring voltage and current probes, the second fault electromagnetic transient characteristics are obtained, including interstage voltage, current, power, and energy.

[0022] Based on another aspect of the present invention, the present invention provides an electrical signal diagnostic system for mechanical tripping faults in on-load tap changer mechanisms, the system comprising:

[0023] A unit is established to select the tap changer topology, and the vacuum tube, main contacts, and auxiliary contacts are equivalent to time-controlled switches to establish a simulation model of tap changer tripping fault.

[0024] The mapping unit is used to define the number of the time control switch and, based on the number of the time control switch, establish a physical mapping relationship between the electrical state and mechanical action of the tap changer.

[0025] The first establishment unit is used to analyze the electrical manifestation of the mechanical tripping fault of the fast mechanism based on the topology of the tap changer and the physical mapping relationship, obtain the electrical fault status of the main contact and the auxiliary contact in the tap changer, and establish a physical model of the tap changer circuit.

[0026] The first acquisition unit is used to establish a timing signal model of the timing switch, generate a timing signal based on the normal switching timing of the tap changer through the timing signal model, establish an electromagnetic transient model of the tap changer under normal operating conditions based on the timing signal and the physical model of the tap changer circuit, and acquire standard electromagnetic transient characteristics based on the electromagnetic transient model of the tap changer.

[0027] a second establishing unit, configured to establish a tap changer tap selector model, configure tap selector and contact action time sequence in the tap changer tap selector model based on the electrical fault state of the main contact and the auxiliary contact, and establish a fault-state electromagnetic transient model under fault based on the tap selector and contact action time sequence and the electromagnetic transient model of the tap changer;

[0028] a second obtaining unit, configured to run the fault-state electromagnetic transient model under tap changer mechanism mechanical tripping fault, and obtain first fault electromagnetic transient characteristics;

[0029] a third obtaining unit, configured to configure an arrester model between tap changer stages, and obtain second fault electromagnetic transient characteristics;

[0030] a result unit, configured to diagnose the tap changer mechanism mechanical tripping fault by the standard electromagnetic transient characteristics, the first fault electromagnetic transient characteristics, and the second fault electromagnetic transient characteristics.

[0031] Preferably, the mapping unit is configured to define the number of the time-controlled switch, and establish a physical mapping relationship between the electrical state and the mechanical action of the tap changer based on the number of the time-controlled switch, wherein defining the number of the time-controlled switch is further configured to:

[0032] define the number of the vacuum tube as Vk, wherein the number and coding of the number parameter k correspond to the mechanical action link of the tap changer;

[0033] define the number of the main contact as MCp, wherein the number and coding of the number parameter p correspond to the mechanical action link of the tap changer;

[0034] define the number of the auxiliary contact as Zl, wherein the number and coding of the number parameter l correspond to the mechanical action link of the tap changer.

[0035] Preferably, the second obtaining unit is configured to run the fault-state electromagnetic transient model under tap changer mechanism mechanical tripping fault, and obtain first fault electromagnetic transient characteristics, including:

[0036] obtain the first fault electromagnetic transient characteristics of the vacuum tube, the main contact, and the auxiliary contact by configuring voltage and current probes.

[0037] Preferably, the third obtaining unit is configured to configure an arrester model between tap changer stages, and obtain second fault electromagnetic transient characteristics, including:

[0038] obtain the second fault electromagnetic transient characteristics by configuring voltage and current probes, and the second fault electromagnetic transient characteristics include inter-stage voltage, current, power, and energy.

[0039] Based on another aspect of the present application, the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a method for diagnosing electrical signals of mechanical tripping failure of an on-load tap changer mechanism.

[0040] Based on another aspect of the present application, the present application provides an electronic device comprising:

[0041] The computer readable storage medium described above; and

[0042] One or more processors for executing the program in the computer readable storage medium.

[0043] The technical scheme of the present application provides a method and system for diagnosing electrical signals of mechanical tripping failure of an on-load tap changer mechanism, wherein the method comprises: selecting a tap changer topology, equivalent to a time-controlled switch for a vacuum tube, a main contact and an auxiliary contact, and establishing a simulation model of tap changer tripping failure; defining the number of the time-controlled switch, and based on the number of the time-controlled switch, establishing a physical mapping relationship between the electrical state and the mechanical action of the tap changer; based on the tap changer topology and the physical mapping relationship, analyzing the electrical manifestation of the mechanical tripping failure of the quick mechanism, obtaining the electrical fault state of the main contact and the auxiliary contact in the tap changer, and establishing a physical model of the tap changer circuit; establishing a time-controlled signal model of the time-controlled switch, generating a time sequence signal based on the time sequence of the normal switching of the tap changer through the time-controlled signal model, based on the time sequence signal and the physical model of the tap changer circuit, establishing an electromagnetic transient model of the tap changer under normal working conditions, and based on the electromagnetic transient model of the tap changer, obtaining standard electromagnetic transient characteristics; establishing a tap selector model of the tap changer, configuring the tap selector and the contact action time sequence in the tap selector model of the tap changer based on the electrical fault state of the main contact and the auxiliary contact, and based on the tap selector and the contact action time sequence and the electromagnetic transient model of the tap changer, establishing a fault electromagnetic transient model under fault state; running the fault electromagnetic transient model under the mechanical tripping failure of the tap changer mechanism, obtaining first fault electromagnetic transient characteristics; configuring an arrester model between the tap changer stages, obtaining second fault electromagnetic transient characteristics; and diagnosing the mechanical tripping failure of the tap changer mechanism by comparing the standard electromagnetic transient characteristics, the first fault electromagnetic transient characteristics and the second fault electromagnetic transient characteristics. The technical scheme of the present application can simulate the transient process under tap changer tripping failure and accurately reproduce the overvoltage phenomenon between the contact stages by constructing a refined simulation model that integrates the mechanical fault time sequence and the electrical response, and the model has the ability to evaluate the protection efficiency of the arrester, can effectively extract fault characteristics and reveal evolution laws, and provides key data support for equipment state early warning, insulation coordination optimization and protection design, and has significant engineering practicality and diagnostic value. BRIEF DESCRIPTION OF DRAWINGS

[0044] The exemplary embodiments of this application will be more fully understood from the following drawing, in which:

[0045] Figure 1 Flow chart of electrical signal diagnosis method for mechanical tripping fault of on-load tap changer according to preferred embodiment of the present application;

[0046] Figure 2 Flow chart of electrical signal diagnosis method for mechanical tripping fault of on-load tap changer according to preferred embodiment of the present application;

[0047] Figure 3 Topology diagram of vacuum on-load tap changer according to preferred embodiment of the present application;

[0048] Figure 4 Different electrical fault state diagram of on-load tap changer after fast mechanism tripping fault according to preferred embodiment of the present application;

[0049] Figure 5 Transient characteristic diagram after tripping fault of certain topology according to preferred embodiment of the present application; and

[0050] Figure 6 Structure diagram of electrical signal diagnosis system for mechanical tripping fault of on-load tap changer according to preferred embodiment of the present application. DETAILED DESCRIPTION

[0051] Reference will now be made to the drawings, wherein the exemplary embodiments of the present application will be more fully described by reference to the drawings. The present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art. The terminology used in the description of the exemplary embodiments herein is not intended to be limiting in scope, but is intended to be illustrative of the present application. Throughout the specification, like reference numerals will be used to describe like elements including in the drawings.

[0052] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0053] Figure 1 Flow chart of electrical signal diagnosis method for mechanical tripping fault of on-load tap changer according to preferred embodiment of the present application;

[0054] This invention constructs a simulation model that can accurately simulate the electromagnetic transient behavior of on-load tap changers under mechanical tripping faults, revealing the electrical characteristics under rapid mechanism mechanical tripping faults, and guiding accurate assessment of on-load tap changer status, early fault warning, and optimization of protection strategies.

[0055] This invention proposes an electrical signal diagnostic method for mechanical tripping faults in on-load tap changers. Based on a selected tap changer topology, this invention establishes a tripping fault simulation model in an electromagnetic transient simulation platform, equating the vacuum tube, main contacts, and auxiliary contacts to time-controlled switches. Various contacts are numbered, and a physical mapping relationship with mechanical actions is established. The electrical manifestations of mechanical tripping faults are analyzed, and a circuit physical model including fault states is constructed. A time-controlled signal module and a tap selector model are integrated to establish electromagnetic transient models under normal and fault conditions. Transient characteristics such as voltage, current, power, and energy of the vacuum tube, main and auxiliary contacts, and inter-stage surge arresters are obtained through simulation. Finally, by comparing normal and fault simulation data, fault electrical characteristic patterns are extracted to evaluate the surge arrester protection effect and provide a basis for fault diagnosis and protection design. This invention can achieve accurate simulation and characteristic analysis of tap changer tripping faults with different switching topologies.

[0056] like Figure 1 As shown, the present invention provides an electrical signal diagnosis method for mechanical tripping faults in on-load tap changer mechanisms, the method comprising:

[0057] Step 101: Select the tap changer topology, and treat the vacuum tube, main contacts, and auxiliary contacts as equivalent time-controlled switches to establish a tap changer tripping fault simulation model;

[0058] This invention selects a tap changer topology, and based on the topology circuit structure, establishes a tap changer tripping fault simulation model, and treats the vacuum tube, main contacts, and auxiliary contacts as equivalent time-controlled switch models to simulate the opening or closing action.

[0059] Tap changers are the core components of transformers for voltage regulation. Tripping faults refer to serious electrical faults such as the rapid tripping of the tap changer mechanism, the energized operation of the tap selector, and the explosion of the inter-stage surge arrester. The simulation model of tap changer tripping faults is designed to simulate the electrical faults that occur in the tap changer under the condition of rapid mechanism tripping and to analyze the electromagnetic transient characteristics of each component under fault conditions.

[0060] Step 102: Define the number of the time control switch, and based on the number of the time control switch, establish the physical mapping relationship between the electrical state and mechanical action of the tap changer;

[0061] Preferably, a time-control switch number is defined, and based on the time-control switch number, a physical mapping relationship between the electrical state and mechanical action of the tap changer is established. Defining the time-control switch number includes:

[0062] The number of the vacuum tube is defined as Vk, wherein the number and coding of the parameter k correspond to the mechanical action link of the tapping switch;

[0063] The number of the main contact is defined as MCp, wherein the number and coding of the parameter p correspond to the mechanical action link of the tapping switch;

[0064] The number of the auxiliary contact is defined as Zl, wherein the number and coding of the parameter l correspond to the mechanical action link of the tapping switch.

[0065] The present application defines the model number of the vacuum tube time control switch as Vk, the model number of the main contact time control switch as MCp, and the model number of the auxiliary contact time control switch as Zl, wherein the number and coding of k, p and l are based on the selected tapping switch switching topology in step 101, and further, a physical mapping relationship associated with the mechanism action is established.

[0066] Step 103: Based on the tapping switch topology and the physical mapping relationship, the electrical manifestation of the rapid mechanism mechanical tripping fault is analyzed, the electrical fault state of the main contact and the auxiliary contact in the tapping switch is obtained, and a physical model of the tapping switch circuit is established;

[0067] Based on the tapping switch switching topology and the mapping relationship in step S101, the present application analyzes the electrical manifestation of the rapid mechanism mechanical tripping fault, obtains the electrical fault state of the main contact MCp and the auxiliary contact Zl of the tapping switch, and establishes a physical model of the tapping switch switching circuit. Figure 3 、 Figure 4 As shown in the figure, it is the circuit model of the switching switch.

[0068] Step 104: Establishing a time control signal model of the time control switch, generating a time sequence signal based on the normal switching time sequence of the tapping switch through the time control signal model, establishing a normal working condition electromagnetic transient model of the tapping switch based on the time sequence signal and the physical model of the tapping switch circuit, and obtaining standard electromagnetic transient characteristics based on the electromagnetic transient model of the tapping switch;

[0069] The present application constructs a time control switch model opening control signal module, generates a time sequence signal in combination with the normal switching time sequence of the tapping switch, and further establishes a standard electromagnetic transient model of the tapping switch in combination with the tapping switch switching circuit physical model in step 103.

[0070] The time control signal model of the present application refers to a model established based on a time signal control in PSCAD, EMTP-RV and other electromagnetic transient software.

[0071] The electromagnetic transient model of the tap changer in this invention refers to the electromagnetic transient characteristics of the corresponding voltage, current, etc., of the switching devices such as vacuum tubes in the tap changer during the opening and closing process.

[0072] Step 105: Establish a tap selector model for the tap changer. Based on the electrical fault states of the main contacts and auxiliary contacts, configure the timing sequence of tap selector and contact operation in the tap selector model. Based on the timing sequence of tap selector and contact operation and the electromagnetic transient model of the tap changer, establish an electromagnetic transient model under fault conditions.

[0073] This invention establishes a tap selector model for a tap changer. Based on the different electrical fault states of different contacts in step 103, the timing sequence of tap selector and contact operation is configured. Combined with the electromagnetic transient model of the tap changer in step 104, an electromagnetic transient model under tripping fault is established.

[0074] The tap selector of the present invention is a component of the tap switch that enables tap position selection. The stationary contact of the tap selector is closely connected to the voltage regulating winding of the transformer, and the moving contact is connected to the switching switch. The tap selector model reflects the connection between the switching switch and the transformer winding and the tap position selection.

[0075] The electromagnetic transient model under fault conditions is a model that can simulate the electromagnetic transient characteristics such as voltage and current of components such as switching switches and vacuum tubes when a fault occurs.

[0076] Step 106: Run the electromagnetic transient model under the mechanical tripping fault of the tap changer mechanism to obtain the electromagnetic transient characteristics of the first fault;

[0077] Preferably, the electromagnetic transient model under a mechanical tripping fault of the tap changer mechanism is run to obtain the electromagnetic transient characteristics of the first fault, including:

[0078] By configuring voltage and current probes, the first fault electromagnetic transient characteristics of the vacuum tube, main contacts, and auxiliary contacts are obtained.

[0079] In step 105 of this invention, an electromagnetic transient model under tripping fault is used to configure voltage and current probes to obtain the electromagnetic transient characteristics of vacuum tube Vk, main contact MCp, and auxiliary contact Zl.

[0080] Step 107: Configure a surge arrester model between tap changer stages to obtain the electromagnetic transient characteristics of the second fault;

[0081] Preferably, an arrester model is configured between tap changer stages to obtain the electromagnetic transient characteristics of the second fault, including:

[0082] By configuring voltage and current probes, the electromagnetic transient characteristics of the second fault are obtained. The electromagnetic transient characteristics of the second fault include interstage voltage, current, power, and energy.

[0083] The invention is a distribution switch interstage configuration arrester model, and a voltage and current probe is configured to obtain interstage voltage, current, power, energy and other electromagnetic transient characteristics.

[0084] The arrester model in the PSCAD software of the invention is a metal oxide surge arrester.

[0085] Step 108: Diagnose the mechanical tripping fault of the tap switch mechanism by comparing the standard electromagnetic transient characteristics, the first fault electromagnetic transient characteristics and the second fault electromagnetic transient characteristics.

[0086] The invention compares the simulation results in steps 106 and 107 with the tap switch electromagnetic transient model under normal switching in step 104, obtains the law of electrical signals under tap switch tripping fault, and can be further used to evaluate the protection effect of the arrester under fault conditions, and provides a basis for fault diagnosis and protection design.

[0087] As shown in the invention Figure 5 The electromagnetic transient characteristics of the interstage arrester of the tap switch under a certain tripping fault are shown in the invention, and by comparing the electromagnetic transient characteristics under normal conditions, it can be found that the power far exceeds the limit that the arrester can withstand, in addition to which the port voltage and current and other electromagnetic transient characteristics can be compared.

[0088] The invention provides an electrical signal diagnosis method for mechanical tripping fault of on-load tap changer fast mechanism, which establishes a tripping fault simulation model equivalent to time-controlled switch of vacuum tube, main contact and auxiliary contact in an electromagnetic transient simulation platform based on selected tap changer topology, and establishes electromagnetic transient models under normal and fault conditions; obtains voltage, current, power and energy and other transient characteristics of vacuum tube, main and auxiliary contacts and interstage arrester through simulation; and finally extracts fault electrical characteristic law by comparing normal and fault simulation data, which is used to evaluate the protection effect of the arrester and provide a basis for fault diagnosis and protection design.

[0089] The invention can simulate the transient process under tap switch tripping fault by constructing a refined simulation model that integrates mechanical fault timing and electrical response, and accurately reproduces the overvoltage phenomenon between the contact stages; the model has arrester protection efficiency evaluation capability, can effectively extract fault characteristics and reveal evolution law, and provides key data support for equipment state early warning, insulation coordination optimization and protection design, and has significant engineering practicality and diagnostic value.

[0090] Figure 2 A flowchart of the electrical signal diagnosis method for mechanical tripping fault of on-load tap changer fast mechanism is provided in the invention, wherein the flowchart includes the following steps:

[0091] (1) Select a tap switch switching switch topology, based on the topology circuit structure, establish a tap switch tripping fault simulation model, and equivalent vacuum tube, main contact, auxiliary contact to time control switch model to simulate opening or closing action;

[0092] (2) Define the time control switch model number of the vacuum tube Vk, the time control switch model number of the main contact MCp, and the time control switch model number of the auxiliary contact Zl, wherein the number and code of k, p and l are subject to the tap switch switching topology selected in S1, and further, a physical mapping relationship associated with the mechanism action is established;

[0093] (3) Based on the tap switch switching switch topology and the mapping relationship in step (1), analyze the electrical form of the fast mechanism mechanical tripping fault, obtain the electrical fault state of the tap switch main contact MCp and the auxiliary contact Zl, and establish a tap switch switching switch circuit physical model;

[0094] (4) Construct a time control switch model opening control signal module, generate a time sequence signal in combination with the tap switch normal switching time sequence, and further establish a tap switch electromagnetic transient model in combination with the tap switch switching switch circuit physical model in step (3);

[0095] (5) Establish a tap switch selector model, configure the tap selector and the contact action time sequence based on the different electrical fault states of the different contacts in step (3), and establish an electromagnetic transient model under tripping fault in combination with the tap switch electromagnetic transient model in step (4);

[0096] (6) Run the electromagnetic transient model under tripping fault in step (5), configure voltage and current probes, and obtain the electromagnetic transient characteristics of the vacuum tube Vk, the main contact time MCp, and the auxiliary contact Zl;

[0097] (7) Further, configure an arrester model between the tap switch stages, and configure voltage and current probes to obtain electromagnetic transient characteristics such as stage voltage, current, power and energy;

[0098] (8) Compare and analyze the simulation results in steps (6) and (7) with the tap switch electromagnetic transient model under normal switching in step (4), obtain the electrical signal rule under tap switch tripping fault, and further be used for evaluating the protection effect of the arrester under fault condition, and provide a basis for fault diagnosis and protection design.

[0099] Figure 6 A structure diagram of an electrical signal diagnosis system for a mechanical tripping fault of a load tap changer mechanism according to a preferred embodiment of the present application.

[0100] As Figure 6As shown, the present application provides an electrical signal diagnosis system for mechanical tripping failure of an on-load tap changer mechanism, the system comprising:

[0101] The establishment unit 601 is configured to select a tap changer topology, equivalently treat a vacuum tube, a main contact and an auxiliary contact as a time-controlled switch, and establish a simulation model of tap changer tripping failure;

[0102] The mapping unit 602 is configured to define the number of the time-controlled switch, and establish a physical mapping relationship between the electrical state and the mechanical action of the tap changer based on the number of the time-controlled switch;

[0103] Preferably, the mapping unit 602 is configured to define the number of the time-controlled switch, and establish a physical mapping relationship between the electrical state and the mechanical action of the tap changer based on the number of the time-controlled switch, wherein the definition of the number of the time-controlled switch is further configured to:

[0104] define the number of the vacuum tube as Vk, wherein the number and coding of the parameter k correspond to the mechanical action link of the tap changer;

[0105] define the number of the main contact as MCp, wherein the number and coding of the parameter p correspond to the mechanical action link of the tap changer;

[0106] define the number of the auxiliary contact as Zl, wherein the number and coding of the parameter l correspond to the mechanical action link of the tap changer.

[0107] The first establishment unit 603 is configured to analyze the electrical manifestation of the fast mechanism mechanical tripping failure based on the tap changer topology and the physical mapping relationship, obtain the electrical fault state of the main contact and the auxiliary contact in the tap changer, and establish a physical model of the tap changer circuit;

[0108] The first acquisition unit 604 is configured to establish a time-controlled signal model of the time-controlled switch, generate a time sequence signal based on the time-controlled signal model and the normal switching time sequence of the tap changer, establish a normal working condition electromagnetic transient model of the tap changer based on the time sequence signal and the physical model of the tap changer circuit, and obtain standard electromagnetic transient characteristics based on the electromagnetic transient model of the tap changer;

[0109] The second establishment unit 605 is configured to establish a tap selector model of the tap changer, configure the tap selector and the contact action time sequence in the tap selector model of the tap changer based on the electrical fault state of the main contact and the auxiliary contact, and establish a fault state electromagnetic transient model under failure based on the tap selector and the contact action time sequence and the electromagnetic transient model of the tap changer;

[0110] The second acquisition unit 606 is configured to run the fault state electromagnetic transient model under failure of the tap changer mechanism mechanical tripping failure, and obtain first fault electromagnetic transient characteristics;

[0111] Preferably, the second obtaining unit 606 is configured to run a fault electromagnetic transient model under a mechanical tripping failure of the tap changer mechanism, and obtain the first fault electromagnetic transient characteristics, including:

[0112] The first fault electromagnetic transient characteristics of the vacuum tube, the main contact and the auxiliary contact are obtained by configuring voltage and current probes.

[0113] The third obtaining unit 607 is configured to configure a surge arrester model between tap changer stages, and obtain second fault electromagnetic transient characteristics.

[0114] Preferably, the third obtaining unit 607 is configured to configure a surge arrester model between tap changer stages, and obtain second fault electromagnetic transient characteristics, including:

[0115] The second fault electromagnetic transient characteristics are obtained by configuring voltage and current probes, and the second fault electromagnetic transient characteristics include inter-stage voltage, current, power and energy.

[0116] The result unit 608 is configured to diagnose the mechanical tripping failure of the tap changer mechanism by comparing the standard electromagnetic transient characteristics, the first fault electromagnetic transient characteristics and the second fault electromagnetic transient characteristics.

[0117] The present application provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement steps of an electrical signal diagnosis method for a mechanical tripping failure of a load tap changer mechanism.

[0118] The present application provides an electronic device, characterized in that, comprising:

[0119] The computer readable storage medium described above; and

[0120] One or more processors configured to execute the program in the computer readable storage medium.

[0121] Those skilled in the art should understand that embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer usable program code. The solutions in the embodiments of the present application can be implemented in various computer languages, such as object-oriented programming language Java and interpreted scripting language JavaScript.

[0122] The present application is described in reference to the flowchart and / or block diagram of the method, apparatus (system) and computer program product according to an embodiment of the present application. It will be understood that each block of the flowchart and / or block diagram, and combinations of blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0123] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0124] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0125] While preferred embodiments of the application have been described, it should be apparent that additional changes and modifications can be made to the embodiments without departing from the spirit and scope of the application. It is the intention, therefore, to confine the application only as by the scope of the appended claims and equivalents thereof.

[0126] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

[0127] The application has been described with reference to numerous embodiments. As is readily appreciated, other embodiments than the one disclosed are equally possible within the scope of the present application, which is defined by the appended claims and their equivalents.

[0128] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a" or "an" means "at least one" unless otherwise clearly indicated by the context of the only language "one or more". The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims

1. An electrical signal diagnosis method for mechanical tripping failure of a load tap changer mechanism, the method comprising: selecting a tap changer topology, equivalent to time-controlled switches for vacuum tubes, main contacts and auxiliary contacts, to establish a tap changer tripping failure simulation model; defining numbers of the time-controlled switches, and based on the numbers of the time-controlled switches, establishing a physical mapping relationship between electrical states and mechanical actions of the tap changer; based on the tap changer topology and the physical mapping relationship, analyzing electrical manifestations of fast mechanism mechanical tripping failure, obtaining electrical fault states of the main contacts and the auxiliary contacts in the tap changer, and establishing a tap changer circuit physical model; establishing a time-controlled signal model of the time-controlled switches, generating time sequence signals based on tap changer normal switching time sequences through the time-controlled signal model, based on the time sequence signals and the tap changer circuit physical model, establishing a normal working condition tap changer electromagnetic transient model, and based on the tap changer electromagnetic transient model, obtaining standard electromagnetic transient characteristics; establishing a tap changer selector model, configuring tap selector and contact action time sequences in the tap changer selector model based on the electrical fault states of the main contacts and the auxiliary contacts, and based on the tap selector and contact action time sequences and the tap changer electromagnetic transient model, establishing a fault state fault electromagnetic transient model; running the fault electromagnetic transient model under tap changer mechanism mechanical tripping failure to obtain first fault electromagnetic transient characteristics; configuring an arrester model between tap changer stages to obtain second fault electromagnetic transient characteristics; diagnosing tap changer mechanism mechanical tripping failure by comparing the standard electromagnetic transient characteristics, the first fault electromagnetic transient characteristics and the second fault electromagnetic transient characteristics.

2. The method of claim 1, wherein the defining numbers of the time-controlled switches, and based on the numbers of the time-controlled switches, establishing a physical mapping relationship between electrical states and mechanical actions of the tap changer, comprises: defining numbers of vacuum tubes as Vk, wherein the number and coding of the numbering parameter k correspond to mechanical action links of the tap changer; defining numbers of main contacts as MCp, wherein the number and coding of the numbering parameter p correspond to mechanical action links of the tap changer; defining numbers of auxiliary contacts as Zl, wherein the number and coding of the numbering parameter l correspond to mechanical action links of the tap changer.

3. The method of claim 1, wherein the running the fault electromagnetic transient model under tap changer mechanism mechanical tripping failure to obtain first fault electromagnetic transient characteristics, comprises: obtaining first fault electromagnetic transient characteristics of the vacuum tubes, the main contacts and the auxiliary contacts by configuring voltage and current probes.

4. The method of claim 1, wherein the configuring an arrester model between tap changer stages to obtain second fault electromagnetic transient characteristics, comprises: obtaining the second fault electromagnetic transient characteristics including inter-stage voltage, current, power and energy by configuring voltage and current probes.

5. An electrical signal diagnosis system for on-load tap changer mechanism mechanical trip fault, the system comprising: a building unit configured to select a tap changer topology, equivalently a vacuum tube, a main contact and an auxiliary contact to a time-controlled switch, and build a tap changer trip fault simulation model; a mapping unit configured to define a number of the time-controlled switch, and build a physical mapping relationship between an electrical state and a mechanical action of the tap changer based on the number of the time-controlled switch; a first building unit configured to analyze an electrical manifestation of a fast mechanism mechanical trip fault based on the tap changer topology and the physical mapping relationship, obtain an electrical fault state of the main contact and the auxiliary contact in the tap changer, and build a tap changer circuit physical model; a first obtaining unit configured to build a time-controlled signal model of the time-controlled switch, generate a time sequence signal based on a normal switching time sequence of the tap changer through the time-controlled signal model, build a normal working condition tap changer electromagnetic transient model based on the time sequence signal and the tap changer circuit physical model, and obtain a standard electromagnetic transient characteristic based on the normal working condition tap changer electromagnetic transient model; a second building unit configured to build a tap changer selector model, configure a tap selector and a contact action time sequence in the tap changer selector model based on the electrical fault state of the main contact and the auxiliary contact, and build a fault state fault electromagnetic transient model based on the tap selector and the contact action time sequence and the tap changer electromagnetic transient model; a second obtaining unit configured to run the fault electromagnetic transient model under the tap changer mechanism mechanical trip fault, and obtain a first fault electromagnetic transient characteristic; a third obtaining unit configured to configure an arrester model between tap changer stages, and obtain a second fault electromagnetic transient characteristic; a result unit configured to diagnose the tap changer mechanism mechanical trip fault by comparing the standard electromagnetic transient characteristic, the first fault electromagnetic transient characteristic and the second fault electromagnetic transient characteristic.

6. The system of claim 5, wherein the mapping unit is configured to define the number of the time-controlled switch, and build the physical mapping relationship between the electrical state and the mechanical action of the tap changer based on the number of the time-controlled switch, and wherein defining the number of the time-controlled switch further comprises: defining a number of the vacuum tube as Vk, wherein a number and a code of a parameter k correspond to a mechanical action link of the tap changer; defining a number of the main contact as MCp, wherein a number and a code of a parameter p correspond to the mechanical action link of the tap changer; defining a number of the auxiliary contact as Zl, wherein a number and a code of a parameter l correspond to the mechanical action link of the tap changer.

7. The system of claim 5, wherein the second obtaining unit is configured to run the fault electromagnetic transient model under the tap changer mechanism mechanical trip fault, and obtain the first fault electromagnetic transient characteristic, and wherein the second obtaining unit is configured to obtain the first fault electromagnetic transient characteristic of the vacuum tube, the main contact and the auxiliary contact by configuring a voltage and current probe. ​ 8. The system of claim 5, wherein the third obtaining unit is configured to obtain second fault electromagnetic transient characteristics by configuring a surge arrester model between the tap changers, comprising: obtaining the second fault electromagnetic transient characteristics by configuring voltage and current probes, wherein the second fault electromagnetic transient characteristics comprise inter-stage voltage, current, power, and energy.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The program, when executed by the processor, implements the steps of the method of any one of claims 1-4.

10. An electronic device, comprising: comprising: the computer readable storage medium of claim 9; and one or more processors configured to execute the program in the computer readable storage medium.

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