Test device for mechanical and electrical stress of converter transformer tap changer contact

Abstract

The application relates to a test device for mechanical and electrical stress of a converter transformer tap changer contact, which comprises at least one group of contacts and a plurality of contact electrical connecting pieces; a power supply module for generating an output current signal of a target current value and applying the output current signal to each group of contacts and the plurality of contact electrical connecting pieces to control each group of contacts to perform closing or opening operation by using the output current signal; a plurality of sensor units for detecting a voltage signal between a moving contact and a static contact in the at least one group of contacts and monitoring current signals of the plurality of contact electrical connecting pieces and motion parameter information of each group of contacts; and a data acquisition unit for acquiring corresponding transient voltage and current signals when the contacts are closed and opened according to the sensor information and then acquiring electrical and mechanical parameters in a contact switching process, so as to provide quantitative evaluation data for operation and action characteristics of the contacts and the converter transformer tap changer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage engineering, in particular to a test device for mechanical and electrical stress of a tap changer contact of a converter transformer. BACKGROUND

[0002] The energy and load centers in China present a reverse distribution, and the ultra-high voltage direct current transmission technology is an important means to solve the imbalance between energy and demand areas. In the ultra-high voltage project, the on-load voltage regulating tap changer of the converter transformer is the main means of voltage regulation of the converter transformer, among which the main contact of the tap changer is one of the important elements for the stable operation of the tap changer and the entire converter transformer and the rapid switching of the tap position. In the actual operation process, phenomena such as mechanical wear, decomposition of transformer oil by discharge, deposition of solid impurities, and electrode material ablation are observed on the main contact of the tap changer, which poses a serious hidden danger to the normal operation of the tap changer and the rapid switching, and the safe operation of the converter transformer.

[0003] The main contact of the tap changer bears the operating current of the transformer when the tap changer is kept on, and requires that the contact of the main contact be stable and the resistance value be lower than the operating requirement. During the switching process, the main contact of the tap changer needs to withstand the mechanical impact and electrical stress during the switching process completed within 100 milliseconds, and continue to maintain stable connection after switching. The mechanical and electrical stress on the main contact of the tap changer during the switching process is relatively complex, the discharge process is random, and is affected by factors such as the roughness of the main contact electrode surface, the closing speed of the tap changer, the operating current of the tap changer, the switching phase, and the structural parasitic capacitance and inductance in the circuit topology of the tap changer. In addition, the discharge process of the tap changer and the subsequent electrode surface ablation are two physical processes with complex coupling relationship and large difference in time scale, and the relationship between the mechanical and electrical stress on the main contact of the tap changer and the numerous influencing factors cannot be completely simulated by theoretical calculation and simulation analysis. The mechanical structure of the tap changer prototype device and the insulation safety requirement in the operation process limit the installation and measurement of sensors in the main contact topology structure.

[0004] In summary, the existing converter transformer cannot measure the transient voltage and current and other parameters on the contact during the normal operation and switching of the tap changer, and cannot provide reliable quantitative evaluation data for the operation and action characteristics of the operating tap changer, which needs to be solved urgently. SUMMARY

[0005] The present application provides a test device for mechanical and electrical stress of a tap changer contact of a converter transformer to solve the problems that the existing converter transformer cannot measure the transient voltage and current and other parameters on the contact during the normal operation and switching of the tap changer, and cannot provide reliable quantitative evaluation data for the operation and action characteristics of the operating tap changer.

[0006] The first aspect of the present application provides a test device for mechanical and electrical stress of tap changer contacts of a converter transformer, comprising: at least one group of contacts and a plurality of contact electrical connection pieces; a power supply module configured to generate an output current signal of a target current value and apply the output current signal to each group of contacts and the plurality of contact electrical connection pieces to close or open any group of contacts by using the output current signal; a plurality of sensor units configured to detect a voltage signal between a moving contact and a stationary contact in the at least one group of contacts and monitor a current signal of the plurality of contact electrical connection pieces and motion parameter information of each group of contacts; and a data acquisition unit configured to acquire the voltage signal, the current signal, and the motion parameter information in the plurality of sensor units, obtain a steady-state voltage and current distribution according to the voltage signal, the current signal, and the motion parameter information, start a preset motor drive power supply in the test device, and close the at least one group of contacts to obtain a first transient voltage and current signal, reverse switch the motor drive power supply, and open the at least one group of contacts to obtain a second transient voltage and current signal, and acquire mechanical and electrical stress parameters in a contact switching process based on the first transient voltage and current signal, the second transient voltage and current signal, and the steady-state voltage and current distribution.

[0007] Optionally, in an embodiment of the present application, the test device further comprises: a spindle drive unit; a contact fixing seat configured to fix the contacts, connect the contacts and a preset test device body structure, and maintain insulation between each group of contacts; and a contact action connecting piece comprising a transmission shaft and a contact connecting piece connecting the moving contact and the transmission shaft, configured to maintain insulation between each group of contacts and between the contacts and the transmission shaft.

[0008] Optionally, in an embodiment of the present application, the spindle drive unit comprises: a drive motor; a transmission gear assembly configured to connect the drive motor and the transmission shaft; a motor drive power supply configured to drive the drive motor to rotate in a forward direction or a reverse direction and switch a communication state of each group of contacts; and a motor support assembly configured to maintain insulation between the spindle drive unit and each group of contacts.

[0009] Optionally, in an embodiment of the present application, the at least one group of contacts comprises: an electrode bearing limiting device and a buffer spring; and a contact electrode configured to rotate around the electrode bearing limiting device by the moving contact, mechanically and electrically connect the moving contact and the stationary contact, and connect the electrode bearing limiting device of the stationary contact by the buffer spring to buffer mechanical impact when the moving contact is closed.

[0010] Optionally, in one embodiment of the present application, the device further comprises: a bypass device between each group of contacts, for simulating a vacuum interrupter unit in an actual tap changer topology.

[0011] Optionally, in one embodiment of the present application, the multiple sensor units include: a voltage sensing unit for detecting the voltage signal between the moving contact and the static contact; a mechanical motion sensing unit for detecting the motion parameter information of each group of contacts; and a current sensor unit for detecting the current signal of each contact electrical connector in the multiple contact electrical connectors.

[0012] The second aspect of the present application provides a method for testing the mechanical and electrical stresses of contacts of a converter transformer tap changer, comprising the following steps: increasing the current value of the output current of a preset current power supply at a preset rate to obtain an output current signal of a target current value, and applying the output current signal to each preset group of contacts and multiple contact electrical connectors; measuring the voltage signal between the moving contact and the static contact in each group of contacts, and monitoring the current signal of the multiple contact electrical connectors and the motion parameter information of each group of contacts; obtaining a steady-state voltage and current distribution based on the voltage signal, the current signal and the motion parameter information, and starting a preset motor drive power supply and closing at least one corresponding group of contacts to obtain a first transient voltage and current signal, reversely switching the motor drive power supply and disconnecting the at least one group of contacts to obtain a second transient voltage and current signal, and obtaining the mechanical and electrical stress parameters during the contact switching process based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution.

[0013] A third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for testing mechanical and electrical stresses of contacts of a converter transformer tap changer as described in the above embodiment.

[0014] A fourth aspect of the present application provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-mentioned test method for mechanical and electrical stress of converter transformer tap changer contacts.

[0015] A fifth aspect of the present application provides a computer program product, including a computer program, which is executed to implement the above-mentioned test method for mechanical and electrical stress of converter transformer tap changer contacts.

[0016] Therefore, the embodiments of the present application have the following beneficial effects:

[0017] The embodiments of the present application can include at least one group of contacts and a plurality of contact electrical connections; a power module configured to generate an output current signal of a target current value and apply the output current signal to each group of contacts and the plurality of contact electrical connections to control each group of contacts to perform a closing or opening operation using the output current signal; a plurality of sensor units configured to detect a voltage signal between a moving contact and a stationary contact in the at least one group of contacts and monitor a current signal of the plurality of contact electrical connections and a motion parameter information of each group of contacts; and a data acquisition unit configured to acquire the voltage signal, the current signal and the motion parameter information in the plurality of sensor units, obtain a steady-state voltage current distribution according to the voltage signal, the current signal and the motion parameter information, start a preset motor drive power supply in a test device, and close the at least one group of contacts to obtain a first transient voltage current signal, reverse switch the motor drive power supply, and open the at least one group of contacts to obtain a second transient voltage current signal, and obtain mechanical and electrical stress parameters in a contact switching process based on the first transient voltage current signal, the second transient voltage current signal and the steady-state voltage current distribution. The present application not only can measure the voltage and current of the main contact branch of the tap changer, but also can measure the mechanical parameters such as displacement and motion speed in the main contact switching process, thereby providing experimental data support for the state monitoring under the steady state of the main contact and the discharge analysis in the switching process. Thus, the problems that the existing converter transformer is difficult to measure the transient voltage and current parameters on the contact in the normal operation and switching of the tap changer, and cannot provide reliable quantitative evaluation data for the operation and action characteristics of the operating converter transformer tap changer are solved.

[0018] Additional aspects and advantages of the present application will be made apparent from the following description, which proceeds with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 An example diagram of a test device for mechanical and electrical stress of a tap changer contact of a converter transformer according to an embodiment of the present application;

[0021] Figure 2 An electrical topology connection schematic diagram of a test device for mechanical and electrical stress of a tap changer contact of a converter transformer according to an embodiment of the present application;

[0022] Figure 3 A top view of a test device for mechanical and electrical stress of a tap changer contact of a converter transformer according to an embodiment of the present application;

[0023] Figure 4A logic architecture schematic diagram of a test device for mechanical and electrical stress of a tap changer contact of a converter transformer is provided for an embodiment of the present application.

[0024] Figure 5 A flow chart of a test method for mechanical and electrical stress of a tap changer contact of a converter transformer is provided for an embodiment of the present application.

[0025] Figure 6 An execution logic schematic diagram of a test method for mechanical and electrical stress of a tap changer contact of a converter transformer is provided for an embodiment of the present application.

[0026] Figure 7 A structure schematic diagram of an electronic device is provided for an embodiment of the present application.

[0027] Wherein, 10 - a test device for mechanical and electrical stress of a tap changer contact of a converter transformer; 1 - a bypass device, 11 - a vacuum arc extinguisher; 2 - a main shaft driving unit, 21 - a driving motor, 22 - a transmission gear assembly, 23 - a motor driving power supply, 24 - a motor support assembly, 25 - a contact locking device; 3 - a contact fixed seat; 4 - a contact action connecting piece, 41 - a transmission shaft, 42 - a contact connecting piece; 5 - a contact fixed seat; 100 - a contact, 101 - a static contact, 1011 - a static contact electrode, 1012 - a static contact electrode terminal post, 1013 - a static contact electrode bearing part, 102 - a moving contact, 1021 - a moving contact electrode, 1022 - a moving contact electrode terminal post, 1023 - a moving contact electrode bearing part; 200 - a contact electrical connecting piece; 300 - a power supply module; 400 - a sensor unit, 401 - a voltage sensing unit, 402 - a mechanical action sensing unit, 403 - a current sensor unit; 500 - a data acquisition unit; 701 - a memory, 702 - a processor, 703 - a communication interface. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0029] An experimental device for mechanical and electrical stress of a tap changer contactor of a converter transformer is described below with reference to the accompanying drawings. In view of the problems mentioned in the background art, the present application provides an experimental device for mechanical and electrical stress of a tap changer contactor of a converter transformer, in which the device comprises at least one group of contacts and a plurality of contact electrical connection pieces; a power supply module for generating an output current signal of a target current value and applying the output current signal to each group of contacts and the plurality of contact electrical connection pieces to control each group of contacts to perform closing or opening operation by using the output current signal; a plurality of sensor units for detecting a voltage signal between a moving contact and a stationary contact in the at least one group of contacts and monitoring a current signal of the plurality of contact electrical connection pieces and motion parameter information of each group of contacts; a data acquisition unit for acquiring the voltage signal, the current signal and the motion parameter information in the plurality of sensor units, obtaining a steady-state voltage and current distribution according to the voltage signal, the current signal and the motion parameter information, starting a preset motor drive power supply in the experimental device, and closing the at least one group of contacts to obtain a first transient voltage and current signal, reversing the motor drive power supply, and opening the at least one group of contacts to obtain a second transient voltage and current signal, and obtaining mechanical and electrical stress parameters in a contact switching process based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution. The present application not only can measure the voltage and current of the main contact branch of the tap changer, but also can measure mechanical parameters such as displacement and motion speed in the main contact switching process, thereby providing experimental data support for state monitoring under steady state of the main contact and discharge analysis in the switching process. Thus, the problems that the existing converter transformer is difficult to measure transient voltage and current parameters on the contact during normal operation and switching of the tap changer, and cannot provide reliable quantitative evaluation data for operation and action characteristics of the running converter transformer tap changer are solved.

[0030] Specifically, Figure 1 A block schematic diagram of the experimental device for mechanical and electrical stress of a tap changer contactor of a converter transformer of the present application is shown.

[0031] As Figure 1 shown, the experimental device for mechanical and electrical stress of a tap changer contactor of a converter transformer 10 comprises at least one group of contacts 100, a plurality of contact electrical connection pieces 200, a power supply module 300, a plurality of sensor units 400 and a data acquisition unit 500.

[0032] The at least one group of contacts 100.

[0033] Each group of contacts 100 in the embodiment of the present application comprises a static contact 101 and a dynamic contact 102, and each group of contacts 100 is composed of a contact electrode and an electrode-carrying limiting device, wherein the static contact 101 is composed of a static contact electrode 1011, a static contact electrode terminal 1012 and a static contact electrode carrying part 1013, and the dynamic contact 102 is composed of a dynamic contact electrode 1021, a dynamic contact electrode terminal 1022 and a dynamic contact electrode carrying part 1023.

[0034] In actual implementation, the contact 100 can be installed with multiple groups of contact electrodes, and the static contact electrode 1011 and the dynamic contact electrode 1021 can be detachable; in addition, the contact electrode of the dynamic contact 102 can rotate around the electrode-carrying limiting device of the dynamic contact 102 and mechanically and electrically connect with the contact electrode of the corresponding static contact 101.

[0035] Optionally, in an embodiment of the present application, at least one group of contacts 100 comprises an electrode-carrying limiting device and a contact electrode.

[0036] The electrode-carrying limiting device and the buffer spring.

[0037] The contact electrode is used to mechanically and electrically connect the dynamic contact 102 and the static contact 101 by rotating the dynamic contact 102 around the electrode-carrying limiting device, and connect the electrode-carrying limiting device of the static contact through the buffer spring to buffer the mechanical impact when the dynamic contact 102 is closed.

[0038] It should be noted that in the embodiment of the present application, each group of contacts 100 can be designed according to the main contact of the tap changer of the converter transformer in actual engineering, wherein each static contact 101 is composed of multiple contact electrodes and an electrode-carrying device (i.e. an electrode-carrying limiting device), the multiple contact electrodes are installed on the electrode-carrying device and fixed on the contact fixing seat 5 by the electrode-carrying device; at the same time, the electrode-carrying device can reliably contact and well conduct electricity with the contact electrode.

[0039] The dynamic contact 102 is limited by a single electrode on the dynamic contact electrode carrying device, and the dynamic contact electrode 1021 can rotate and switch between the two static contacts 101 and can form good electrical contact with the static contacts 101 respectively.

[0040] In the specific implementation process, the static contact electrode 1011 and the electrode-carrying limiting device can be connected by a buffer spring to buffer the mechanical impact when the dynamic contact 102 is closed.

[0041] Optionally, in an embodiment of the present application, the test device 10 for mechanical and electrical stress of tap changer contacts of converter transformer of the embodiment of the present application further comprises: a bypass device 1 between each group of contacts 100, for simulating the vacuum interrupter unit in the actual tap changer topology.

[0042] As shown in the embodiment of the present application, the bypass device 1 between the contacts 100 is further included, which is used to simulate the vacuum interrupter unit in the actual tap changer topology, and in some application scenarios, the bypass device can be borne by the actual vacuum interrupter 11. Figure 2

[0043] The plurality of contact electrical connectors 200.

[0044] Further, the embodiment of the present application further comprises a plurality of contact electrical connectors 200, which include the connectors between the vacuum interrupter 11 and the contacts 100, and can better bear the large current under the extreme working condition of the tap changer.

[0045] Optionally, in an embodiment of the present application, the test device 10 for mechanical and electrical stress of tap changer contacts of converter transformer of the embodiment of the present application further comprises: a main shaft driving unit 2, a contact fixed seat 3 and a contact action connector 4.

[0046] The main shaft driving unit 2.

[0047] The contact fixed seat 3 is used to fix the contacts 100, connect the contacts 100 and the preset test device main body structure, and maintain the insulation between each group of contacts 100.

[0048] The contact action connector 4 includes a transmission shaft 41 and a contact connector 42 connecting the moving contact 102 and the transmission shaft 41, and is used to maintain the insulation between each group of contacts 100 and between the contacts 100 and the transmission shaft 41.

[0049] It should be noted that the contact fixed seat 5 in the embodiment of the present application is made of insulating material, can install multiple groups of contacts 100, is used to fix the contacts 100, connect the contacts 100 and the test device main body, and maintain the insulation between the contacts 100; in addition, the contact fixed seat 5 of the embodiment of the present application also needs to bear the electrode bearing device of the contacts 100, and needs to bear the line voltage under the actual tap changer operating condition and the mechanical impact force in the test device switching process.

[0050] Secondly, the contact action connector 4 in the embodiment of the present application includes a transmission shaft 41 and a contact connector 42 connecting the moving contact 102 and the transmission shaft 41; wherein the transmission shaft 41 can bear the rotating torque, drive the contact connector 42, and further drive the moving contact 102 to rotate.

[0051] ​In actual implementation, the contact connector 42 is made of insulating material to ensure insulation between the contacts 100 and between the contacts 100 and the transmission shaft 41 , while also ensuring mechanical strength during rotation.

[0052] Optionally, in one embodiment of the present application, the spindle drive unit 2 includes: a drive motor 21 , a transmission gear assembly 22 , a motor drive power supply 23 and a motor support assembly 24 .

[0053] Among them, the driving motor 21.

[0054] The transmission gear assembly 22 is used to connect the drive motor 21 and the transmission shaft 41 .

[0055] The motor driving power supply 23 is used to drive the driving motor 21 to rotate forward or reverse and switch the connection state of each group of contacts 100.

[0056] The motor support assembly 24 is used to maintain insulation between the spindle drive unit 2 and each set of contacts 100 .

[0057] Specifically, the spindle drive unit in the embodiment of the present application includes a drive motor 21, such as Figure 3 The shown components include multiple transmission gears 22 (i.e., transmission gear components) connecting the drive motor 21 and the transmission shaft 41, a motor drive power supply 23 for the drive motor 21, and a support component 24 (i.e., a motor support component) for the motor and other components.

[0058] The drive motor 21 can meet the speed and torque required to be output when the main contacts of the tap changer are switched, thereby ensuring that the moving contact 102 can be switched into place within the specified time sequence range;

[0059] The motor drive power supply 23 can drive the drive motor 21 to rotate forward and reverse, and switch the contact 100 to close and open; secondly, the motor drive power supply 23 can adjust the voltage and limit the current, so that the switching speed, switching acceleration torque and closing pressure of the contact 100 can be adjusted, thereby providing the voltage and current required by the drive motor 21, and the motor drive power supply 23 has current limiting and protection measures, which can well cope with the starting torque when the drive motor 21 starts and the stall current after the contact 100 is in place.

[0060] In addition, the embodiment of the present application further includes a contact locking device 25, which can effectively ensure that after the contacts 100 make contact, the contacts 100 remain stably connected even after the motor drive power supply 23 is disconnected and the force of the drive motor 21 is removed.

[0061] It should be noted that the support component 24 in the embodiment of the present application is composed of several insulating materials to ensure the insulation between the strong current and the weak current between the main shaft driving unit 2 and the contact 100, and in the specific implementation process, the contact fixing seat 5, the contact 100 and the support component 24 can also be soaked in transformer oil.

[0062] The power module 300 is used to generate an output current signal of a target current value and apply the output current signal to each group of contacts 100 and the plurality of contact electrical connectors 200 to close or open any group of contacts 100 by using the output current signal.

[0063] The embodiment of the present application also includes a large current power supply 300 (i.e. a power module), as shown in the figure, which is connected to the contact 100 through the contact electrical connector 200. Figure 4

[0064] After the large current power supply 300 is started, the output current of the large current power supply 300 can be slowly increased and adjusted to a preset current size, and a large current under the extreme working condition of the tap switch can be output.

[0065] Therefore, the embodiment of the present application can load the output large current between the contacts 100 by the large current power supply 300, i.e. provide the current during the working of the tap switch between the contacts 100, and the contact electrical connector 200 in the embodiment of the present application can withstand the current during the normal working of the tap switch, so the large current can also be loaded in the plurality of contact electrical connectors 200.

[0066] The plurality of sensor units 400 are used to detect the voltage signal between the moving contact 102 and the stationary contact 101 in at least one group of contacts and monitor the current signal of the plurality of contact electrical connectors 200 and the motion parameter information of each group of contacts 100.

[0067] Optionally, in an embodiment of the present application, the plurality of sensor units 400 include a voltage sensing unit 401, a mechanical action sensing unit 402 and a current sensor unit 403.

[0068] The voltage sensing unit 401 is used to detect the voltage signal between the moving contact 102 and the stationary contact 101.

[0069] The mechanical action sensing unit 402 is used to detect the motion parameter information of each group of contacts 100.

[0070] The current sensor unit 403 is used to detect the current signal of each contact electrical connector 200 in the plurality of contact electrical connectors 200.

[0071] ​It should be noted that the plurality of sensor units 400 in the embodiments of the present application mainly consist of a voltage sensor unit 401, a mechanical action sensing unit 402 and a current sensor unit 403.

[0072] Among them, the current sensor unit 403 is generally composed of a Rogowski coil current sensor; the voltage sensor unit 401 is directly collected by an oscilloscope in the subsequent data acquisition unit 500, and a gas discharge tube and other impact protection devices are added to protect the data acquisition unit 500.

[0073] In the actual execution process, the voltage sensing unit 401 in the embodiments of the present application is located between the moving contact 102 and the static contact 101 to measure the voltage between the moving contact 102 and the static contact 101; the current sensor unit 403 is respectively located between the plurality of contact electrical connectors 200 to monitor the current of the plurality of contact electrical connectors 200; the mechanical action sensing unit 402 is located on the contact 100 to monitor the motion parameters of the contact 100, in addition, the above-mentioned sensor unit 400 can also be installed on the vacuum arc-extinguishing device branch.

[0074] The data acquisition unit 500 is used for collecting voltage signals, current signals and motion parameter information in the plurality of sensor units 400, and obtaining a steady-state voltage and current distribution according to the voltage signals, the current signals and the motion parameter information, and starting a pre-set motor drive power supply 23 in the test device 10, and closing at least one group of contacts 100 to obtain a first transient voltage and current signal, and reversely switching the motor drive power supply 23, and opening at least one group of contacts 100 to obtain a second transient voltage and current signal, and obtaining mechanical and electrical stress parameters in the contact 100 switching process based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution.

[0075] Further, in the embodiments of the present application, the measurement values of the plurality of sensor units 400 can also be read and recorded by the data acquisition unit, thereby obtaining the voltage and current distribution under the steady state; secondly, the motor drive power supply 23 is started, and the contact 100 is closed, at this time the data acquisition unit 500 can receive a trigger signal, and collect and record the transient voltage and current signal in the contact 100 closing process (i.e. the first transient voltage and current signal); then, the motor drive power supply 23 can be reversely switched in the embodiments of the present application, the contact 100 rotates in the reverse direction, and the contact 100 is opened, at this time the data acquisition unit 500 receives a trigger signal, collects and records the transient voltage and current signal in the contact 100 opening process (i.e. the second transient voltage and current signal); finally, the transient electrical stress, discharge energy and other parameters in the contact 100 switching process can be obtained based on the voltage and current signals collected by the data acquisition unit 500.

[0076] As an implementable manner, in the embodiment of the present application, the main shaft driving unit 2 can be automatically controlled by a microcontroller and corresponding driving of the motor driving power supply 23, the contact locking device 25 and the like, so that the test device 10 of the embodiment of the present application can automatically run and switch, and the data acquisition unit 500 can automatically acquire and store the data of the sensor unit 400.

[0077] Therefore, the embodiment of the present application can not only measure the voltage, current and mechanical movement and other parameters of the contact 100 when the tap changer is normally working, but also measure the transient voltage, current and other parameters on the contact 100 when the tap changer is switched; in addition, the embodiment of the present application can measure the voltage, current and other parameters on the contact 100 through the sensor unit 400, and provide quantitative evaluation data for the operation and action characteristics of the contact 100 and the tap changer of the converter transformer.

[0078] The test device for mechanical and electrical stress of a tap changer contact of a converter transformer according to the embodiment of the present application comprises at least one group of contacts 100 and a plurality of contact electrical connecting pieces 200; a power supply module 300 is configured to generate an output current signal of a target current value, and apply the output current signal to each group of contacts and the plurality of contact electrical connecting pieces, so as to control each group of contacts to perform closing or opening operation by using the output current signal; a plurality of sensor units 400 are configured to detect a voltage signal between a moving contact and a static contact in the at least one group of contacts, and monitor a current signal of the plurality of contact electrical connecting pieces and motion parameter information of each group of contacts; and a data acquisition unit 500 is configured to acquire the voltage signal, the current signal and the motion parameter information in the plurality of sensor units, obtain a steady-state voltage and current distribution according to the voltage signal, the current signal and the motion parameter information, start a preset motor driving power supply, and close the at least one group of contacts to obtain a first transient voltage and current signal, reverse the motor driving power supply, and open the at least one group of contacts to obtain a second transient voltage and current signal, and acquire a mechanical and electrical stress parameter in a contact switching process based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution. The present application can not only measure the voltage and current of the main contact branch of the tap changer, but also measure the displacement, motion speed and other mechanical parameters in the switching process of the main contact, thereby providing experimental data support for the state monitoring under the steady state of the main contact and the discharge analysis in the switching process.

[0079] Secondly, the test method for mechanical and electrical stress of a tap changer contact of a converter transformer according to the embodiment of the present application is described with reference to the accompanying drawings.

[0080] Figure 5 The flowchart of the test method for mechanical and electrical stress of a tap changer contact of a converter transformer provided by the embodiment of the present application is shown in FIG. 6.

[0081] As Figure 5As shown, the test method of the mechanical and electrical stress of the converter transformer tap changer contact includes the following steps:

[0082] In step S501, the current value of the output current of the preset current source is raised by a preset rate to obtain an output current signal of a target current value, and the output current signal is applied to each group of contacts and the plurality of contact electrical connectors.

[0083] The embodiment of the present application first needs to confirm the connection of the contact electrical connector, that is, the embodiment of the present application can use a low resistance tester to measure the continuity of each electrical connector and the contact resistance of the contact to ensure continuity and prevent unstable connection of the contact electrical connector from causing current surge of the large current source to damage the equipment.

[0084] Secondly, the embodiment of the present application can open the data acquisition unit and set the data acquisition unit parameters matched with the sensor unit.

[0085] Specifically, the embodiment of the present application can adjust the input voltage, current amplitude and time scale of the data acquisition unit according to the input current of the large current source, and adjust the trigger level and edge selection of the data acquisition unit according to the voltage of the motor drive power source for controlling the contact switching, so as to ensure that the data acquisition unit can start collecting data in time when the contact is in action, and ensure that the transient data when the contact is disconnected is not discarded.

[0086] Then, the embodiment of the present application can start the large current source, slowly raise the output current of the large current source and adjust it to a preset current size to obtain a corresponding output current signal, and apply the output current signal to each group of contacts and the plurality of contact electrical connectors, so as to control each group of contacts to perform closing or opening operation by using the output current signal.

[0087] In step S502, the voltage signal between the moving contact and the static contact in each group of contacts is measured, and the current signal of the plurality of contact electrical connectors and the motion parameter information of each group of contacts are monitored.

[0088] In step S503, the steady-state voltage and current distribution is obtained according to the voltage signal, the current signal and the motion parameter information, a preset motor drive power source is started, and at least one group of contacts is closed to obtain a first transient voltage and current signal, the motor drive power source is reversely switched, and at least one group of contacts is disconnected to obtain a second transient voltage and current signal, and the mechanical and electrical stress parameters in the contact switching process are obtained based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution.

[0089] Further, the embodiment of the present application can measure the voltage signal between the moving contact and the static contact in each group of contacts through the preset sensor unit, monitor the current signal of the plurality of contact electrical connectors and the motion parameter information of each group of contacts, and read the corresponding measurement values of the sensor unit through the preset data acquisition unit and record, thereby obtaining the voltage and current distribution under the steady state. It should be noted that in the embodiment of the present application, the current value of each contact electrical connector should comply with Kirchhoff's current law, thereby ensuring the measurement correctness of the sensor unit.

[0090] Secondly, the embodiment of the present application can start the motor drive power supply and close the contact. At this time, the data acquisition unit receives the trigger signal, collects the transient voltage and current signal in the contact closing process (i.e. the first transient voltage and current signal) and records.

[0091] In actual execution process, the embodiment of the present application can calculate the switching speed and delay of the contact according to the voltage and current limit value set by the motor drive power supply, and then adjust the delay and acquisition window length of the data acquisition unit, so as to ensure that the sampling rate can meet the capture of the transient voltage and current waveform in the contact closing process.

[0092] After that, the embodiment of the present application can reverse switch the motor drive power supply, rotate the contact in the reverse direction, and disconnect the contact. At this time, the data acquisition unit receives the trigger signal, collects the transient voltage and current signal in the contact opening process (i.e. the second transient voltage and current signal) and records.

[0093] Finally, the embodiment of the present application can obtain the transient electrical stress, discharge energy and other parameters in the contact switching process according to the voltage and current signals collected by the data acquisition unit.

[0094] As a kind of can be realized way, the embodiment of the present application can calculate discharge power curve and discharge energy by the voltage and current value collected by data acquisition unit, it should be noted that the reference direction of voltage and current is different due to the different setting mode of sensor unit, need to adjust the direction of data acquisition unit.

[0095] The execution logic of the test method for mechanical and electrical stress of the converter transformer tap changer contact of the present application is described below by combining the drawings.

[0096] Figure 6 The execution logic diagram of the test method for mechanical and electrical stress of the converter transformer tap changer contact of the present application is shown in FIG. Figure 6 As shown in the figure, the execution process of the test method for mechanical and electrical stress of the converter transformer tap changer contact of the present application is described as follows:

[0097] S601: Confirm the connection of the contact electrical connector to prevent unstable connection of the contact electrical connector from causing current surge of the large current power supply and damaging the equipment;

[0098] S602: Turn on the data acquisition unit, set the data acquisition unit parameters matched with the sensor unit;

[0099] S603: Start the large current power supply, slowly increase the output current of the large current power supply and adjust it to the preset current size;

[0100] S604: The data acquisition unit reads the measurement value of the sensor unit and records, thereby obtaining the steady-state voltage current distribution;

[0101] S605: Start the motor drive power supply, close the contact, at this time the data acquisition unit receives the trigger signal, collects the transient voltage current signal in the contact closing process and records;

[0102] S606: Reverse switch the motor drive power supply, rotate the contact in the opposite direction, open the contact, at this time the data acquisition unit receives the trigger signal, collects the transient voltage current signal in the contact opening process and records;

[0103] S607: According to the voltage current signal collected by the data acquisition unit, obtain the transient electrical stress, discharge energy and other parameters in the contact switching process.

[0104] It should be noted that the foregoing explanation and description of the test device embodiment of the mechanical and electrical stress of the tap changer contact of the converter transformer also applies to the test method of the mechanical and electrical stress of the tap changer contact of the converter transformer of this embodiment, which will not be described here.

[0105] According to the test method of the mechanical and electrical stress of the tap changer contact of the converter transformer provided in the embodiments of the present application, the current value of the output current of the preset current power supply is increased at a preset rate to obtain an output current signal of a target current value, and the output current signal is applied to each group of contacts and a plurality of contact electrical connectors; the voltage signal between the moving contact and the stationary contact in each group of contacts is measured, and the current signal of the plurality of contact electrical connectors and the motion parameter information of each group of contacts are monitored; the steady-state voltage current distribution is obtained according to the voltage signal, the current signal and the motion parameter information, a preset motor drive power supply is started, and at least one group of corresponding contacts is closed to obtain a first transient voltage current signal, the motor drive power supply is reversely switched, and at least one group of contacts is opened to obtain a second transient voltage current signal, and based on the first transient voltage current signal, the second transient voltage current signal and the steady-state voltage current distribution, the mechanical and electrical stress parameters in the contact switching process are obtained. The present application not only can measure the voltage and current of the tap changer main contact branch, but also can measure the mechanical parameters such as displacement and motion speed in the main contact switching process, thereby providing experimental data support for the state monitoring of the main contact in the steady state and the discharge analysis in the switching process.

[0106] Figure 7 A structural schematic diagram of an electronic device is provided for the embodiments of the present application. The electronic device can include:

[0107] The memory 701, the processor 702 and the computer program stored in the memory 701 and executable on the processor 702.

[0108] The processor 702 implements the test method of mechanical and electrical stress of tap changer contacts of a converter transformer provided in the above embodiments when executing the program.

[0109] Further, the electronic device further includes:

[0110] The communication interface 703 is used for communication between the memory 701 and the processor 702.

[0111] The memory 701 is used for storing the computer program executable on the processor 702.

[0112] The memory 701 can include a high-speed RAM memory, and can also include a non-volatile memory, for example, at least one disk memory.

[0113] If the memory 701, the processor 702 and the communication interface 703 are independently implemented, the communication interface 703, the memory 701 and the processor 702 can be connected to each other through a bus and complete communication between each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 7 Only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0114] Optionally, in specific implementation, if the memory 701, the processor 702 and the communication interface 703 are integrated on a chip, the memory 701, the processor 702 and the communication interface 703 can complete communication between each other through an internal interface.

[0115] The processor 702 can be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or a plurality of integrated circuits configured to implement one or more embodiments of the present application.

[0116] The embodiments of the present application further provide a computer readable storage medium, which has stored thereon a computer program, and the computer program is executed by a processor to implement the test method for mechanical and electrical stress of tap changer contact of a converter transformer.

[0117] The embodiments of the present application further provide a computer program product, which comprises a computer program, and the computer program is executed to implement the test method for mechanical and electrical stress of tap changer contact of a converter transformer.

[0118] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or N embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0119] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0120] Any process or method descriptions in flow charts or described elsewhere herein can be understood as representing one or N steps of a computer readable medium comprising executable instructions for performing custom logic functions or processes, and the scope of preferred embodiments of the present application includes additional implementation in which the functions performed in the illustrated or discussed order are performed in a different order, including substantially simultaneously, or in reverse order, as will be understood by those skilled in the art of the present application.

[0121] The logic and / or steps represented in the flowcharts and / or described herein, for example, can be considered as a sequence of instructions to implement logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device, such as a computer-based system, processor- based system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can be a computer- readable storage medium or a computer-readable signal medium. The computer- readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include the following: an electrical connection having one or more wires (electrical connections), a portable computer diskette (a magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium can even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via, for example, optical scanning of the paper or other medium, then compiled, interpreted, or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

[0122] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, the N steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware and in another embodiment, any of the following technologies, known in the art, or their combinations can be used: discrete logic circuitry having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.

[0123] Those skilled in the art can understand that all or part of the steps carried out by the above-mentioned embodiments can be completed by programs instructing related hardware, and the programs can be stored in a computer-readable storage medium. When the programs are executed, one or a combination of the steps of the method embodiments is included.

[0124] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing module, or each of the units can be physically present separately, or two or more units can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0125] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A test device for mechanical and electrical stress of a tap changer contact of a converter transformer, characterized in that The application relates to a test device for testing mechanical and electrical stress parameters in a contact switching process, comprising: at least one group of contacts and a plurality of contact electrical connections; a power module for generating an output current signal of a target current value and applying the output current signal to each group of contacts and the plurality of contact electrical connections to close or open any group of contacts by using the output current signal; a plurality of sensor units for detecting a voltage signal between a moving contact and a static contact in the at least one group of contacts and monitoring a current signal of the plurality of contact electrical connections and motion parameter information of each group of contacts; a data acquisition unit for acquiring the voltage signal, the current signal and the motion parameter information in the plurality of sensor units, obtaining a steady-state voltage and current distribution according to the voltage signal, the current signal and the motion parameter information, starting a preset motor drive power supply in the test device, closing the at least one group of contacts to obtain a first transient voltage and current signal, reversely switching the motor drive power supply and opening the at least one group of contacts to obtain a second transient voltage and current signal, and acquiring the mechanical and electrical stress parameters in the contact switching process based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution.

2. The apparatus of claim 1, wherein, Further comprising: a main shaft driving unit; a contact fixing seat for fixing the contacts and connecting the contacts and a preset test device main body structure and maintaining insulation between the each group of contacts; a contact action connecting piece comprising a transmission shaft and a contact connecting piece connecting the moving contact and the transmission shaft, for maintaining insulation between the each group of contacts and between the contacts and the transmission shaft.

3. The apparatus of claim 2, wherein, The main shaft driving unit comprises: a driving motor; a transmission gear assembly for connecting the driving motor and the transmission shaft; a motor drive power supply for driving the driving motor to rotate in a forward direction or a reverse direction and switching a communication state of the each group of contacts; a motor support assembly for maintaining insulation between the main shaft driving unit and the each group of contacts.

4. The device according to claim 1, characterized in that The at least one group of contacts comprises: an electrode bearing limiting device and a buffer spring; a contact electrode for rotating the moving contact around the electrode bearing limiting device and mechanically and electrically connecting the moving contact and the static contact and connecting the electrode bearing limiting device of the static contact by the buffer spring to buffer mechanical impact when the moving contact is closed.

5. The apparatus of claim 1, wherein, Further comprising: a bypass device between the each group of contacts for simulating a vacuum arc extinguisher unit in an actual tap changer topology.

6. The apparatus of claim 1, wherein, The plurality of sensor units comprise: a voltage sensing unit for detecting a voltage signal between the moving contact and the static contact; a mechanical action sensing unit for detecting motion parameter information of the each group of contacts; a current sensor unit for detecting a current signal of each contact electrical connection in the plurality of contact electrical connections.

7. A method of testing mechanical and electrical stresses of a tap changer contact of a converter transformer, characterized in that The application further comprises the following steps: increasing a current value of an output current of a preset current power supply by a preset rate to obtain an output current signal of a target current value and applying the output current signal to each group of contacts and a plurality of contact electrical connections. measuring voltage signals between the moving contact and the stationary contact in each group of contacts, and monitoring current signals of the plurality of contact electrical connections and motion parameter information of each group of contacts; obtaining a steady-state voltage current distribution according to the voltage signals, the current signals and the motion parameter information, starting a preset motor drive power supply, and closing at least one group of contacts corresponding to the motor drive power supply to obtain a first transient voltage current signal, reversely switching the motor drive power supply, and opening the at least one group of contacts to obtain a second transient voltage current signal, and obtaining mechanical and electrical stress parameters in a contact switching process based on the first transient voltage current signal, the second transient voltage current signal and the steady-state voltage current distribution.

8. An electronic device, comprising: comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the test method for mechanical and electrical stresses of a tap changer contact of a converter transformer according to claim 7.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the test method for mechanical and electrical stresses of a tap changer contact of a converter transformer according to claim 7.

10. A computer program product comprising a computer program, characterized in that, The computer program is executed to implement the test method for mechanical and electrical stresses of a tap changer contact of a converter transformer according to claim 7. The computer program is executed to implement the test method for mechanical and electrical stresses of a tap changer contact of a converter transformer according to claim 7.

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