Testing device for mechanical and electrical stress of tap switch contact of converter transformer

Abstract

The invention relates to a converter transformer tap switch contact mechanical and electrical stress test device, which comprises at least one group of contacts and a plurality of contact electrical connecting pieces, the power supply module is used 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 so as to control each group of contacts to execute closing or opening operation by using the output current signal; the plurality of sensor units are used for detecting voltage signals between the moving contact and the 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 the data acquisition unit is used for acquiring corresponding transient voltage and current signals when the contact is closed and opened according to the information of the sensor so as to acquire electrical and mechanical parameters in the contact switching process, thereby providing quantitative evaluation data for the operation and action characteristics of the contact and the tap switch of the converter transformer.

Description

Technical Field

[0001] The present application relates to the field of high voltage engineering technology, and in particular to a test device for mechanical and electrical stress of a converter transformer tap switch contact. Background Art

[0002] my country's energy and load centers are distributed inversely, and UHV DC transmission technology is an important means to solve the regional imbalance between energy and demand. In UHV projects, the on-load voltage-adjusting tap changer of the converter transformer is the main means of voltage regulation of the converter transformer. Among them, the main contact of the tap changer is one of the important components for the stable operation of the tap changer and the entire converter transformer, as well as the rapid switching of the tap position. In the actual operation process, mechanical wear, transformer oil decomposition and gas production caused by discharge, solid impurity deposition, and electrode material ablation were observed on the main contacts of the tap changer. These phenomena have caused serious hidden dangers to the normal operation of the tap changer, rapid switching, and 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 remains connected, requiring the contact of the main contact to be stable and the resistance value to be lower than the operating requirements; during the switching process, the main contact of the tap changer needs to withstand the mechanical impact and electrical stress during the switching process within 100 milliseconds, and continue to maintain a stable connection after the switching; the mechanical and electrical stresses generated on the main contact during the switching process of the tap changer are relatively complex, the discharge process is highly random, and is affected by factors such as the surface roughness of the main contact electrode, 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 relationships and huge time scale differences. The relationship between the mechanical and electrical stresses on the main contact of the tap changer and many influencing factors cannot be fully simulated only through theoretical calculations and simulation analysis. The mechanical structure of the real tap changer equipment and the insulation safety requirements during operation limit the installation and measurement of sensors in the main contact topology.

[0004] In summary, it is difficult for existing converter transformers to measure parameters such as transient voltage and current on the contacts during normal operation and switching of the tap changer, and it is impossible to provide reliable quantitative evaluation data for the operation and action characteristics of the tap changer of the converter transformer, which needs to be solved urgently. Summary of the invention

[0005] The present application provides a test device for the mechanical and electrical stress of the contacts of a converter transformer tap changer, so as to solve the problems that it is difficult to measure parameters such as transient voltage and current on the contacts of the existing converter transformer during normal operation and switching of the tap changer, and it is impossible to provide reliable quantitative evaluation data for the operation and action characteristics of the converter transformer tap changer.

[0006] The first aspect of the present application provides a test device for the mechanical and electrical stress of the contacts of a converter transformer tap changer, comprising: at least one group of contacts and a plurality of contact electrical connectors; a power module, used 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 connectors, so as to close or open any group of contacts using the output current signal; a plurality of sensor units, used to detect the voltage signal between the moving contact and the stationary contact in the at least one group of contacts, and monitor the current signal of the plurality of contact electrical connectors and the motion parameter information of each group of contacts; a data acquisition unit, used to collect The voltage signals, the current signals and the motion parameter information in the multiple sensor units are measured, and a steady-state voltage and current distribution is obtained based on the voltage signals, the current signals and the motion parameter information. The motor drive power supply preset in the test device is started, and the at least one group of contacts is closed to obtain a first transient voltage and current signal, the motor drive power supply is reversely switched, and the at least one group of contacts is disconnected to obtain a second transient voltage and current signal, and 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 mechanical and electrical stress parameters in the contact switching process are obtained.

[0007] Optionally, in one embodiment of the present application, it also includes: a spindle drive unit; a contact fixing seat, used to fix the contact, and connect the contact and a preset test device main structure, and maintain insulation between each group of contacts; a contact action connector including a transmission shaft and a contact connector connecting the moving contact and the transmission shaft, used to maintain insulation between each group of contacts and between the contact and the transmission shaft.

[0008] Optionally, in one embodiment of the present application, the spindle drive unit includes: a drive motor; a transmission gear assembly for connecting the drive motor and the drive shaft; a motor drive power supply for driving the drive motor to rotate forward or reverse and switching the connectivity state of each group of contacts; and a motor support assembly for maintaining insulation between the spindle drive unit and each group of contacts.

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

[0010] Optionally, in one embodiment of the present application, it further comprises: a bypass device between each group of contacts, used to simulate 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 a voltage signal between the moving contact and the stationary contact; a mechanical motion sensing unit for detecting motion parameter information of each group of contacts; and a current sensor unit for detecting a current signal of each contact electrical connector among the multiple contact electrical connectors.

[0012] The second aspect of the present application provides a test method for the mechanical and electrical stress of the 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 according to 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 based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution, obtaining the mechanical and electrical stress parameters in the contact switching process.

[0013] The 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 test method for mechanical and electrical stress 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, wherein the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned test method for mechanical and electrical stress of contacts of a converter transformer tap changer.

[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] Embodiments of the present application may include at least one group of contacts and multiple contact electrical connectors; 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 multiple contact electrical connectors, so as to use the output current signal to control each group of contacts to perform a closing or opening operation; multiple sensor units for detecting a voltage signal between a moving contact and a stationary contact in at least one group of contacts, and monitoring a current signal of multiple contact electrical connectors and motion parameter information of each group of contacts; a data acquisition unit for acquiring voltage signals, current signals and motion parameter information in multiple sensor units, and obtaining a steady-state voltage and current distribution based on the voltage signals, current signals and motion parameter information, and starting a motor drive power supply preset in a test device, and closing at least one group of contacts to obtain a first transient voltage and current signal, reversely switching the motor drive power supply, and disconnecting at least one group of contacts to obtain a second transient voltage and current signal, and based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution, obtaining mechanical and electrical stress parameters during the contact switching process. This application can not only measure the voltage and current of the main contact branch of the tap changer, but also measure the displacement, movement speed and other mechanical parameters during the switching process of the main contact, thereby providing experimental data support for the state monitoring of the main contact in a steady state and the discharge analysis during the switching process. Thus, it solves the problem that it is difficult for the existing converter transformer to measure the transient voltage and current parameters on the contact during normal operation and switching of the tap changer, and it is impossible to provide reliable quantitative evaluation data for the operation and action characteristics of the tap changer of the converter transformer.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0021] Figure 2 A schematic diagram of electrical topology connection of a test device for mechanical and electrical stress of a converter transformer tap changer contact provided in one embodiment of the present application;

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

[0023] Figure 4A schematic diagram of the logical architecture of a test device for mechanical and electrical stress of a converter transformer tap changer contact provided in one embodiment of the present application;

[0024] Figure 5 A flow chart of a method for testing mechanical and electrical stress of a converter transformer tap changer contact provided according to an embodiment of the present application;

[0025] Figure 6 A schematic diagram of the execution logic of a test method for mechanical and electrical stress of a converter transformer tap changer contact provided in one embodiment of the present application;

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

[0027] Among them, 10-converter transformer tap switch contact mechanical and electrical stress test device; 1-bypass device, 11-vacuum arc extinguisher; 2-spindle drive unit, 21-drive motor, 22-transmission gear assembly, 23-motor drive power supply, 24-motor support assembly, 25-contact locking device; 3-contact fixing seat; 4-contact action connector, 41-transmission shaft, 42-contact connector; 5-contact fixing seat; 100-contact, 101-static contact, 1011-static contact electrode, 1012 -static contact electrode terminal, 1013-static contact electrode bearing component, 102-moving contact, 1021-moving contact electrode, 1022-moving contact electrode terminal, 1023-moving contact electrode bearing component; 200-contact electrical connector; 300-power module; 400-sensor unit, 401-voltage sensor unit, 402-mechanical motion sensor unit, 403-current sensor unit; 500-data acquisition unit; 701-memory, 702-processor, 703-communication interface. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0029] The following describes a test device for the mechanical and electrical stress of the contacts of the converter transformer tap changer of an embodiment of the present application with reference to the accompanying drawings. In response to the problems mentioned in the above background technology, the present application provides a test device for the mechanical and electrical stress of the contacts of the converter transformer tap changer, in which the device includes at least one group of contacts and multiple contact electrical connectors; 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 multiple contact electrical connectors, so as to control each group of contacts to perform a closing or opening operation using the output current signal; multiple sensor units for detecting the voltage signal between the moving contact and the static contact in at least one group of contacts, and monitoring the current signal of the multiple contact electrical connectors and the operation of each group of contacts. Dynamic parameter information; a data acquisition unit for collecting voltage signals, current signals and motion parameter information from multiple sensor units, and obtaining a steady-state voltage and current distribution based on the voltage signals, current signals and motion parameter information, and starting the motor drive power supply preset in the test device, and closing at least one set of contacts to obtain a first transient voltage and current signal, reversely switching the motor drive power supply, and disconnecting at least one set of contacts to obtain a second transient voltage and current signal, and based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution, obtaining the mechanical and electrical stress parameters in the contact switching process. 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, movement speed and other mechanical parameters in the switching process of the main contact, 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. As a result, the existing converter transformer is difficult to measure the transient voltage and current parameters on the contacts 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 tap changer of the converter transformer.

[0030] Specifically, Figure 1 Schematic diagram of a block diagram of a test device for the mechanical and electrical stress of a converter transformer tap changer contact according to an embodiment of the present application.

[0031] like Figure 1 As shown, the converter transformer tap changer contact mechanical and electrical stress test device 10 includes: at least one group of contacts 100 , a plurality of contact electrical connectors 200 , a power module 300 , a plurality of sensor units 400 and a data acquisition unit 500 .

[0032] At least one set of contacts 100 .

[0033] Each group of contacts 100 in the embodiment of the present application includes a static contact 101 and a moving contact 102, and each group of contacts 100 is composed of a contact electrode and an electrode bearing and 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 bearing component 1013, and the moving contact 102 is composed of a moving contact electrode 1021, a moving contact electrode terminal 1022 and a moving contact electrode bearing component 1023.

[0034] During the actual implementation process, the contact 100 can be installed with multiple groups of contact electrodes, and the static contact electrode 1011 and the moving contact electrode 1021 are detachable; in addition, the contact electrode of the moving contact 102 can rotate around the electrode bearing limit device of the moving contact 102, and be mechanically and electrically connected with the corresponding contact electrode of the static contact 101.

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

[0036] Among them, the electrode carries a limit device and a buffer spring.

[0037] The contact electrode is used to rotate around the electrode load-bearing limit device through the moving contact 102, and mechanically and electrically connect the moving contact 102 and the stationary contact 101, and connect the electrode load-bearing limit device of the stationary contact through a buffer spring to buffer the mechanical impact when the moving contact 102 is closed.

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

[0039] The moving contact 102 is restricted on the moving contact electrode bearing device by a single electrode, and the moving contact electrode 1021 can be rotated and switched between the two stationary contacts 101 and can form good electrical contact with the stationary contacts 101 respectively.

[0040] In a specific implementation process, the stationary contact electrode 1011 and the electrode bearing limit device may be connected by a buffer spring to buffer the mechanical impact when the moving contact 102 is closed.

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

[0042] like Figure 2 As shown, in the embodiment of the present application, a bypass device 1 between the contacts 100 is also included to simulate the vacuum arc extinguisher unit in the actual tap changer topology. In some application scenarios, the bypass device can be assumed by the actual vacuum arc extinguisher 11.

[0043] A plurality of contact electrical connectors 200 .

[0044] Furthermore, the embodiment of the present application also includes a plurality of contact electrical connectors 200 , which include connectors between the vacuum arc extinguisher 11 and the contact 100 , and can better withstand large currents under extreme operating conditions of the tap changer.

[0045] Optionally, in one embodiment of the present application, the converter transformer tap changer contact mechanical and electrical stress testing device 10 of the present embodiment further includes: a main shaft drive unit 2, a contact fixing seat 3 and a contact action connector 4.

[0046] Among them, the spindle drive unit 2.

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

[0048] The contact action connector 4 , which includes a transmission shaft 41 and a contact connector 42 connecting the moving contact 102 and the transmission shaft 41 , is used to maintain 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 fixing seat 5 in the embodiment of the present application is made of insulating material, can be installed with multiple groups of contacts 100, and is used to fix the contacts 100, connect the contacts 100 to the main body of the test device and maintain insulation between the contacts 100; in addition, the contact fixing seat 5 in the embodiment of the present application also needs to carry the electrode carrying device of the contact 100, and needs to withstand the line voltage under the actual operating conditions of the tap changer and the mechanical impact force during the switching process of the test device.

[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 withstand the rotational torque and drive the contact connector 42, further driving the moving contact 102 to rotate.

[0051] In actual implementation, the contact connector 42 is made of insulating material, thereby ensuring insulation between the contacts 100 and between the contacts 100 and the transmission shaft 41 , while 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 driving 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 group 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 multiple transmission gears 22 (i.e., transmission gear components) shown connecting the drive motor 21 and the transmission shaft 41, the motor drive power supply 23 of the drive motor 21, and the supporting components 24 (i.e., motor supporting components) of the motor and other components are shown.

[0058] The drive motor 21 can meet the speed and torque required to be output when the main contacts of the actual 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 are adjustable, 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 of the drive motor 21 when starting 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 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 a number of insulating materials to ensure the insulation between the strong current and the weak current between the spindle drive unit 2 and the contact 100, and in the specific implementation process, the embodiment of the present application can also immerse the contact fixing seat 5, the contact 100 and the support component 24 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 a plurality of contact electrical connectors 200 to close or open any group of contacts 100 using the output current signal.

[0063] The embodiment of the present application also includes a high current power supply 300 (ie, a power supply module), such as Figure 4 As shown, the high current power supply 300 is connected to the contact 100 via the contact electrical connector 200 .

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

[0065] Therefore, the embodiment of the present application can load the output high current between the contacts 100 through the high current power supply 300, that is, provide the current when the tap switch is working between the contacts 100, and the contact electrical connector 200 in the embodiment of the present application can withstand the current when the tap switch is working normally, therefore, the high current can also be loaded in multiple contact electrical connectors 200.

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

[0067] Optionally, in one embodiment of the present application, the plurality of sensor units 400 include: a voltage sensor unit 401 , a mechanical motion sensor 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 motion sensing unit 402 is used to detect motion parameter information of each group of contacts 100 .

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

[0071] It should be noted that the multiple sensor units 400 in the embodiment of the present application are mainly composed of a voltage sensor unit 401 , a mechanical motion sensor unit 402 and a current sensor unit 403 .

[0072] 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] During the actual implementation process, the voltage sensing unit 401 in the embodiment of the present application is located between the moving contact 102 and the stationary contact 101 to measure the voltage between the moving contact 102 and the stationary contact 101; the current sensor unit 403 is respectively located between multiple contact electrical connectors 200 to monitor the current of multiple contact electrical connectors 200 respectively; the mechanical motion 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 extinguisher branch.

[0074] The data acquisition unit 500 is used to collect voltage signals, current signals and motion parameter information from multiple sensor units 400, and obtain a steady-state voltage and current distribution based on the voltage signals, current signals and motion parameter information, and start the motor drive power supply 23 preset in the test device 10, and close at least one group of contacts 100 to obtain a first transient voltage and current signal, reversely switch the motor drive power supply 23, and disconnect at least one group of contacts 100 to obtain a second transient voltage and current signal, and based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution, obtain the mechanical and electrical stress parameters of the contact 100 during the switching process.

[0075] Furthermore, in an embodiment of the present application, the measurement values ​​of multiple sensor units 400 can also be read and recorded by a data acquisition unit, thereby obtaining the voltage and current distribution in a 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 signals (i.e., the first transient voltage and current signals) during the closing process of the contact 100; thereafter, the embodiment of the present application can reversely switch the motor drive power supply 23, and the contact 100 rotates in the opposite direction to disconnect the contact 100. At this time, the data acquisition unit 500 receives a trigger signal, and collects and records the transient voltage and current signals (i.e., the second transient voltage and current signals) during the disconnection process of the contact 100; finally, the embodiment of the present application can obtain parameters such as transient electrical stress and discharge energy during the switching process of the contact 100 based on the voltage and current signals collected by the data acquisition unit 500.

[0076] As a feasible method, in the embodiment of the present application, the spindle drive unit 2 can automatically control the motor drive power supply 23, the contact locking device 25, etc. by a microcontroller and a corresponding drive, so that the test device 10 of the embodiment of the present application can automatically switch operation, and the data acquisition unit 500 can automatically collect and store the data of the sensor unit 400.

[0077] Therefore, the embodiment of the present application can not only measure the voltage, current, mechanical movement and other parameters of the contact 100 when the tap changer is working normally, 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 converter transformer tap changer.

[0078] The test device for the mechanical and electrical stress of the contacts of the converter transformer tap changer proposed in the embodiment of the present application includes at least one group of contacts 100 and a plurality of contact electrical connectors 200; a power module 300, which is used 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 connectors, so as to control each group of contacts to perform a closing or opening operation by using the output current signal; a plurality of sensor units 400, which are used to detect a voltage signal between a moving contact and a stationary contact in at least one group of contacts, and monitor the current signal of the plurality of contact electrical connectors and the motion parameter of each group of contacts. The data acquisition unit 500 is used to collect voltage signals, current signals and motion parameter information from multiple sensor units, and obtain steady-state voltage and current distribution according to the voltage signals, current signals and motion parameter information, and start the preset motor drive power supply, and close at least one set of contacts to obtain a first transient voltage and current signal, reversely switch the motor drive power supply, and disconnect at least one set of contacts to obtain a second transient voltage and current signal, and based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution, obtain the mechanical and electrical stress parameters in the contact switching process. The present application can not only measure the voltage and current of the main contact branch of the tap changer, but also measure the mechanical parameters such as displacement and motion speed in the switching process of the main contact, thereby providing experimental data support for the state monitoring of the main contact in a steady state and the discharge analysis in the switching process.

[0079] Next, a test method for mechanical and electrical stress of a converter transformer tap changer contactor proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0080] Figure 5 A flow chart of a method for testing mechanical and electrical stresses of contacts of a converter transformer tap changer provided in an embodiment of the present application.

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

[0082] In step S501, 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 preset group of contacts and multiple 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 connectivity of each electrical connector and the contact resistance of the contact to ensure connectivity and prevent the unstable connection of the contact electrical connector from causing a sudden change in the large current power supply current to damage the equipment.

[0084] Secondly, the embodiments of the present application can open the data acquisition unit and set the data acquisition unit parameters that match the sensor unit.

[0085] Specifically, the embodiments 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 high-current power supply, and adjust the trigger level and edge selection of the data acquisition unit according to the voltage of the motor drive power supply that controls the contact switching, so as to ensure that the data acquisition unit can start collecting data in time when the contacts are actuated, and ensure that transient data when the contacts are disconnected is not discarded.

[0086] Afterwards, the embodiment of the present application can start the high-current power supply, slowly increase and adjust the output current of the high-current power supply to a preset current size to obtain a corresponding output current signal, and apply the output current signal to each preset group of contacts and multiple contact electrical connectors to use the output current signal to control each group of contacts to perform a closing or opening operation.

[0087] In step S502, 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.

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

[0089] Furthermore, the embodiments of the present application can measure the voltage signal between the moving contact and the stationary contact in each group of contacts through a preset sensor unit, and monitor the current signals of multiple contact electrical connectors and the motion parameter information of each group of contacts, and read and record the corresponding measurement values ​​of the sensor unit through a preset data acquisition unit, thereby obtaining the voltage and current distribution in a steady state; it should be noted that, in the embodiments of the present application, the current value of each contact electrical connector should comply with Kirchhoff's current law, so as to ensure the measurement accuracy of the sensor unit.

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

[0091] During the actual implementation process, the embodiment of the present application can calculate the switching speed and delay of the contacts according to the voltage and current limit values ​​set by the motor drive power supply, and then adjust the delay and acquisition window length of the data acquisition unit to ensure that the sampling rate can meet the requirements of capturing the transient voltage and current waveforms during the contact closing process.

[0092] Afterwards, the embodiment of the present application can reversely switch the motor drive power supply, the contacts rotate in the opposite direction, and the contacts are disconnected. At this time, the data acquisition unit receives the trigger signal, collects the transient voltage and current signals (i.e., the second transient voltage and current signals) during the contact disconnection process, and records them.

[0093] Finally, the embodiments of the present application can obtain parameters such as transient electrical stress and discharge energy during the contact switching process based on the voltage and current signals collected by the data acquisition unit.

[0094] As a feasible method, the embodiment of the present application can calculate the discharge power curve and discharge energy through the voltage and current values ​​collected by the data acquisition unit. It should be noted that the reference direction of the voltage and current is different due to the different settings of the sensor unit, and the direction of the data acquisition unit needs to be adjusted.

[0095] The following describes the execution logic of the test method for the mechanical and electrical stress of the converter transformer tap changer contacts of the present application in combination with the accompanying drawings.

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

[0097] S601: Confirm the connection of the contact electrical connector to prevent the unstable connection of the contact electrical connector from causing a sudden change in the high current power supply current and damaging the equipment;

[0098] S602: Turn on the data acquisition unit and set the data acquisition unit parameters that match the sensor unit;

[0099] S603: starting the high-current power supply, slowly increasing the output current of the high-current power supply and adjusting it to a preset current value;

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

[0101] S605: starting the motor drive power supply and closing the contacts. At this time, the data acquisition unit receives the trigger signal, collects and records the transient voltage and current signals during the contact closing process;

[0102] S606: Reversely switch the motor drive power supply, the contact rotates in the opposite direction, and the contact is disconnected. At this time, the data acquisition unit receives the trigger signal, collects and records the transient voltage and current signals during the contact disconnection process;

[0103] S607: Obtaining parameters such as transient electrical stress and discharge energy during the contact switching process according to the voltage and current signals collected by the data acquisition unit.

[0104] It should be noted that the above explanation of the embodiment of the test device for mechanical and electrical stress of the converter transformer tap changer contacts is also applicable to the test method for mechanical and electrical stress of the converter transformer tap changer contacts of this embodiment, which will not be repeated here.

[0105] According to the test method for mechanical and electrical stress of converter transformer tap changer contacts proposed in the embodiment of the present application, the current value of the output current of a 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 preset group of contacts and multiple contact electrical connectors; the voltage signal between the moving contact and the static contact in each group of contacts is measured, and the current signal of the multiple contact electrical connectors and the motion parameter information of each group of contacts are monitored; a steady-state voltage and current distribution is obtained based on the voltage signal, the current signal and the motion parameter information, and a preset motor drive power supply is started, and at least one corresponding group of contacts is closed to obtain a first transient voltage and current signal, the motor drive power supply is switched in the reverse direction, and at least one group of contacts is disconnected to obtain a second transient voltage and current signal, and 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 mechanical and electrical stress parameters in the contact switching process are obtained. This application can not only measure the voltage and current of the main contact branch of the tap changer, but also measure the mechanical parameters such as displacement and movement speed of the main contact during the switching process, thereby providing experimental data support for the state monitoring of the main contact in steady state and the discharge analysis during the switching process.

[0106] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

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

[0108] When the processor 702 executes the program, the test method for the mechanical and electrical stress of the converter transformer tap changer contacts provided in the above embodiment is implemented.

[0109] Furthermore, the electronic device further comprises:

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

[0111] The memory 701 is used to store computer programs that can be executed on the processor 702 .

[0112] The memory 701 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0113] If the memory 701, the processor 702 and the communication interface 703 are implemented independently, the communication interface 703, the memory 701 and the processor 702 can be connected to each other through a bus and communicate with 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. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0114] Optionally, in a 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 communicate with each other through an internal interface.

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

[0116] The embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned test method for mechanical and electrical stress of contacts of a converter transformer tap changer.

[0117] The embodiment of the present application further provides a computer program product, including a computer program, which, when executed, is used to implement the above-mentioned test method for mechanical and electrical stress of contacts of a converter transformer tap changer.

[0118] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0119] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0120] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0121] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0122] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0123] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0124] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0125] The storage medium mentioned above may 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 can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A test device for mechanical and electrical stress of converter transformer tap changer contacts, characterized in that: include: at least one set of contacts and a plurality of contact electrical connectors; 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 connectors, so as to close or open any group of contacts using the output current signal; A plurality of sensor units, used for detecting voltage signals between the moving contacts and the stationary contacts in the at least one group of contacts, and monitoring current signals of the plurality of contact electrical connectors and motion parameter information of each group of contacts; A data acquisition unit is used to collect the voltage signal, the current signal and the motion parameter information in the multiple sensor units, and obtain a steady-state voltage and current distribution based on the voltage signal, the current signal and the motion parameter information, and start the motor drive power supply preset in the test device, and close the at least one group of contacts to obtain a first transient voltage and current signal, reversely switch the motor drive power supply, and disconnect the at least one group of contacts to obtain a second transient voltage and current signal, and based on the first transient voltage and current signal, the second transient voltage and current signal and the steady-state voltage and current distribution, obtain mechanical and electrical stress parameters in the contact switching process.

2. The device according to claim 1, characterized in that Also includes: Spindle drive unit; A contact fixing seat, used for fixing the contacts, connecting the contacts and a preset test device main structure, and maintaining insulation between each group of contacts; A contact action connector comprises a transmission shaft and a contact connector connecting the moving contact and the transmission shaft, and is used to maintain insulation between each group of contacts and between the contacts and the transmission shaft.

3. The device according to claim 2, characterized in that The spindle drive unit comprises: Drive motor; A transmission gear assembly, used to connect the drive motor and the transmission shaft; A motor driving power supply, used to drive the driving motor to rotate forward or reverse and switch the connection state of each group of contacts; The motor support assembly is used to maintain insulation between the spindle drive unit and each group of contacts.

4. The device according to claim 1, characterized in that The at least one set of contacts comprises: Electrode bearing limit device and buffer spring; The contact electrode is used to rotate around the electrode bearing limit device through the moving contact, and mechanically and electrically connect the moving contact and the stationary contact, and the electrode bearing limit device of the stationary contact is connected through the buffer spring to buffer the mechanical impact when the moving contact is closed.

5. The device according to claim 1, characterized in that Also includes: The bypass device between each group of contacts is used to simulate the vacuum interrupter unit in the actual tap changer topology.

6. The device according to claim 1, characterized in that The plurality of sensor units include: A voltage sensing unit, used to detect a voltage signal between the moving contact and the stationary contact; A mechanical motion sensing unit, used to detect motion parameter information of each group of contacts; The current sensor unit is used to detect a current signal of each of the plurality of contact electrical connectors.

7. A test method for mechanical and electrical stress of converter transformer tap changer contacts, characterized in that: The following steps are involved: Increasing the current value of the output current of the 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 stationary contact in each group of contacts, and monitoring the current signal of the plurality of contact electrical connectors and the motion parameter information of each group of contacts; A steady-state voltage and current distribution is obtained based on the voltage signal, the current signal and the motion parameter information, and a preset motor drive power supply is started, and at least one corresponding set of contacts is closed to obtain a first transient voltage and current signal, the motor drive power supply is switched in reverse, and the at least one set of contacts is disconnected to obtain a second transient voltage and current signal, and 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 mechanical and electrical stress parameters in the contact switching process are obtained.

8. An electronic device, characterized in that: include: 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 stress of contacts of a converter transformer tap changer as claimed in claim 7.

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

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

Images