Device and method for detecting full working conditions of Shaoshan 4 type electric locomotive three-section unequally-divided half-controlled bridge rectifier circuit

Abstract

The invention discloses a device for detecting all working conditions of a Shaoshan 4 type electric locomotive three-section unequal half-controlled bridge rectifier circuit. The device comprises a dynamic load regulation unit, a signal trigger conversion unit and a key parameter detection unit. The dynamic load adjusting unit can simulate the equivalent load change of the traction motor in different traction states under the static condition in the library; the signal triggering conversion unit injects a high-level large-current virtual working condition signal to forcibly trigger a three-section bridge opening logic; the key parameter detection unit synchronously collects current and voltage of a bridge arm and the pull-in state of a contactor and automatically judges whether the current and voltage are qualified or not. The device breaks through the limitation of the existing static test in the library, realizes the bridge opening function detection of the three-section bridge in the library for the first time, fills the technical blank, and solves the problems of incomplete working condition coverage, dependence on manual detection and strong result subjectivity in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of railway electric locomotive maintenance technology, and more specifically, relates to a full-condition testing device and method for the three-section unequal-division semi-controlled bridge rectifier circuit of Shaoshan 4 electric locomotive. Background Technology

[0002] The Shaoshan 4 electric locomotive is one of the main models on China's main railway lines. The core of its traction system is the "three-section unequal half-bridge control" rectifier circuit, which consists of 6 sets of thyristors, 6 sets of diodes and matching trigger units. Its core function is to convert the 25kV AC power input from the contact network into DC power required by the traction motor. Its performance directly determines the stability of the locomotive's traction power, so the maintenance and testing process is crucial.

[0003] Currently, the rectifier bridge test of the Shaoshan 4 electric locomotive mainly relies on the high-voltage test procedure in the depot. However, the existing technology has two major defects: First, the testing equipment is not powerful enough. The power supply capacity and current output level of the high-voltage test equipment in the depot are limited, and it lacks dynamic load simulation and precise signal triggering functions, making it impossible to reproduce the dynamic high-load conditions required for the opening of the three-section bridge. Second, the test method is limited. The existing method can only complete the static test of the first and second sections of the bridge and cannot carry out the opening test of the three-section bridge. The static environment cannot simulate the electrical load and mechanical linkage conditions under the high-level and high-current conditions of the locomotive, which makes it difficult to expose hidden faults such as the performance degradation of rectifier components and loose circuit wiring, and easily leads to sudden failures after the locomotive is put into service.

[0004] Furthermore, there are very few specialized devices and mature methods in China for the three-section open-bridge test of the rectifier bridge of the Shaoshan 4 electric locomotive. There is a lack of solutions that allow for the coordinated adaptation of devices and methods, failing to meet the needs of maintenance under all operating conditions. Therefore, there is an urgent need to develop a highly adaptable and functionally integrated testing device, as well as standardized testing methods based on this device, to fill the existing technological gap. Summary of the Invention

[0005] The purpose of this invention is to provide a full-condition testing device and method for the three-section unequal-division semi-controlled bridge rectifier circuit of the Shaoshan 4 electric locomotive, which solves the technical problems of single function of the existing testing device, incomplete coverage of the test conditions, and failure to detect hidden faults.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a full-condition testing device for the three-section unequal-division semi-controlled bridge rectifier circuit of the Shaoshan 4 electric locomotive, comprising: The dynamic load adjustment unit is electrically connected to the locomotive rectifier circuit and is used to simulate the equivalent load change of the traction motor under different traction states under static conditions in the depot. The signal triggering conversion unit is electrically connected to the locomotive traction system and is used to inject high-level high-current virtual operating condition signals into the locomotive traction system to forcibly trigger the three-segment bridge opening logic. The key parameter detection unit is used to synchronously collect the bridge arm current, bridge arm voltage and contactor engagement status, and automatically determine whether the three-section bridge opening function is qualified based on the collected data.

[0007] Optionally, the dynamic load adjustment unit establishes an electrical connection with the locomotive rectifier circuit through a tooling connector. It is equipped with an adjustable resistive load and inductive load combination module, which can simulate the gradient rise, stability maintenance, fluctuation adjustment and reverse switching of load current, and adapt to the load characteristics of the four core working conditions of locomotive starting, constant speed operation, speed regulation and braking.

[0008] Optionally, the key parameter detection unit consists of a current transformer, a voltage transformer, and an optical fiber voltage probe. The current transformer is used to measure the bridge arm current, the voltage transformer is used to measure the bridge arm voltage, and the optical fiber voltage probe is used to measure the engagement state of the three-section bridge contactor.

[0009] Optionally, the amplitude and frequency of the trigger signal of the signal triggering conversion unit are adjustable and matched with the bridge control logic parameters of the electric locomotive rectifier circuit.

[0010] Secondly, the present invention provides a full-condition testing method for the three-section unequal-division semi-controlled bridge rectifier circuit of the Shaoshan 4 electric locomotive, based on the testing device described in the first aspect, comprising the following steps: S1. Connect the dynamic load adjustment unit, signal trigger conversion unit and key parameter detection unit to the electric locomotive, set the initial voltage and current parameters, and ensure that the initial values ​​are lower than the three-section bridge opening threshold. S2. The signal triggering conversion unit synchronously sends a high-level high-current trigger signal to gradually increase the output current of the dynamic load adjustment unit at a preset rate until the three-segment bridge opening threshold is reached. S3. Simulates four working conditions in sequence: locomotive start-up, constant speed operation, speed regulation, and braking. The key parameter detection unit collects current and voltage data in real time to confirm the effectiveness of the rectification function and simultaneously records the engagement status of the three-section bridge contactor. S4. Using a detection device to simulate three types of faults: open circuit of rectifier components, short circuit of rectifier components, and abnormal trigger signal, record the action response time of the built-in protection device of the rectifier circuit respectively, and verify the power synchronous cut-off function of the interlocking protection mechanism of the detection device. S5. Repeat steps S1-S4 to complete 3 full cycle tests, and summarize all test parameters and status records. S6. If all parameters meet the preset standards, the rectifier circuit is deemed qualified; if any parameters exceed the standards, locate the fault point, repair it, and repeat the above test procedure.

[0011] Optionally, the current boost rate in step S2 is 5-10 A / s.

[0012] Optionally, the continuous test time for each working condition in step S3 shall not be less than 3 minutes, and the key parameter detection unit shall collect data once every 100ms.

[0013] The beneficial effects of this invention are as follows: It provides a full-condition testing device for the three-section unequal split-bridge rectifier circuit of the Shaoshan 4 electric locomotive, comprising: a dynamic load adjustment unit, a signal trigger conversion unit, and a key parameter detection unit. The dynamic load adjustment unit is used to simulate the equivalent load change of the traction motor under different traction states under static conditions in the depot. The signal trigger conversion unit is used to inject a high-level, high-current virtual operating condition signal into the locomotive traction system to forcibly trigger the three-section bridge opening logic. The key parameter detection unit is used to synchronously collect the bridge arm current, bridge arm voltage, and contactor engagement status, and automatically determine whether the three-section bridge opening function is qualified based on the collected data. This testing device overcomes the limitations of existing static tests in depots, which cannot reproduce dynamic high-load conditions. It is the first to achieve the three-section bridge opening function test in a depot environment, filling the technical gap in the three-section bridge opening test of the Shaoshan 4 electric locomotive. The dynamic load adjustment unit can accurately simulate the load changes of the traction motor under different traction states, the signal trigger conversion unit can forcibly trigger the three-section bridge opening logic, and the key parameter detection unit realizes multi-dimensional data synchronous acquisition and automatic judgment. The three components work together to solve the problems of incomplete coverage of working conditions, reliance on manual testing, and strong subjectivity of results in existing technologies.

[0014] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0015] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0016] Figure 1 A schematic structural block diagram of a full-condition testing device for the three-section unequal-division semi-controlled bridge rectifier circuit of the Shaoshan 4 electric locomotive according to Embodiment 1 of the present invention is shown.

[0017] Figure 2 A flowchart of a full-condition testing method for the three-section unequal-division semi-controlled bridge rectifier circuit of the Shaoshan 4 electric locomotive according to an embodiment of the present invention is shown.

[0018] Explanation of reference numerals in the attached figures: 1. Dynamic load adjustment unit; 2. Signal triggering conversion unit; 3. Key parameter detection unit; 4. Tooling connector; 5. Locomotive connector; 6. Locomotive rectifier circuit. Detailed Implementation

[0019] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0020] Example 1

[0021] like Figure 1 As shown, this embodiment provides a full-condition testing device for the three-section unequal-division semi-controlled bridge rectifier circuit of the Shaoshan 4 electric locomotive, characterized in that it includes: The dynamic load adjustment unit 1 is electrically connected to the locomotive rectifier circuit 6 and is used to simulate the equivalent load change of the traction motor under different traction states under static conditions in the depot. Signal triggering conversion unit 2 is electrically connected to the locomotive traction system and is used to inject high-level high-current virtual operating condition signals into the locomotive traction system to forcibly trigger the three-segment bridge opening logic. The key parameter detection unit 3 is used to synchronously collect the bridge arm current, bridge arm voltage and contactor engagement status, and automatically determine whether the three-section bridge opening function is qualified based on the collected data.

[0022] In this embodiment, a communication and connection module is also included. The module adopts the RS485 communication protocol and realizes bidirectional interaction between the detection device and the locomotive control signal through the locomotive connector 5 and the tooling connector 4, so as to ensure the stability and adaptability of signal transmission.

[0023] Specifically, the detection device in this embodiment, by integrating a dynamic load adjustment unit 1, a signal trigger conversion unit 2, and a key parameter detection unit 3, overcomes the limitation of existing static tests in the depot that cannot reproduce dynamic high-load conditions. It is the first to realize the three-section bridge opening function test in the depot environment, filling the technical gap in the three-section bridge opening test of the Shaoshan 4 electric locomotive. The dynamic load adjustment unit 1 can accurately simulate the load changes of the traction motor under different traction states, the signal trigger conversion unit 2 can forcibly trigger the three-section bridge opening logic, and the key parameter detection unit 3 realizes multi-dimensional data synchronous acquisition and automatic judgment. The three work together to solve the problems of incomplete coverage of working conditions, reliance on manual testing, and strong subjectivity of results in the existing technology.

[0024] Optionally, the dynamic load adjustment unit 1 establishes an electrical connection with the locomotive rectifier circuit 6 through the tooling connector 4. It is equipped with an adjustable resistive load and inductive load combination module, which can simulate the gradient rise, stable maintenance, fluctuation adjustment and reverse switching of load current, and adapt to the load characteristics of the four core working conditions of locomotive starting, constant speed operation, speed regulation and braking.

[0025] Specifically, the design of adjustable resistor and inductive loads enables full-characteristic simulation of load current gradient increase, stability maintenance, fluctuation adjustment, and reverse switching. It accurately matches the load requirements of four core operating conditions: locomotive start-up, constant speed operation, speed regulation, and braking. This solves the shortcomings of existing load simulations that are singular and cannot reproduce the actual traction state. By accurately reproducing the load characteristics under different operating conditions, it ensures that the performance of the three-section bridge can be fully verified in various actual operating scenarios, avoiding test result deviations caused by load simulation distortion, and further improving the comprehensiveness and reliability of the three-section bridge opening function test.

[0026] Optionally, the key parameter detection unit 3 consists of a current transformer, a voltage transformer, and an optical fiber voltage probe. The current transformer is used to measure the bridge arm current, the voltage transformer is used to measure the bridge arm voltage, and the optical fiber voltage probe is used to measure the engagement state of the three-section bridge contactor.

[0027] Specifically, the key parameter detection unit 3 adopts a combination design of current transformer, voltage transformer, and fiber optic voltage probe to achieve full-dimensional and complete acquisition of bridge arm current, bridge arm voltage, and contactor engagement status. The fiber optic voltage probe has the advantages of strong anti-interference ability and high detection accuracy, and can accurately capture subtle changes in the engagement status of the three-section bridge contactors. Combined with the quantitative data of the current / voltage transformer, it provides multi-dimensional and high-precision data support for the qualification judgment of the three-section bridge opening function, avoiding the omission of hidden faults due to incomplete or insufficient parameter acquisition.

[0028] Optionally, the amplitude and frequency of the trigger signal of the signal trigger conversion unit 2 are adjustable and matched with the bridge control logic parameters of the electric locomotive rectifier circuit 6.

[0029] Specifically, the signal triggering conversion unit 2 supports adjustable design of trigger signal amplitude and frequency, which can accurately match the bridge control logic parameters of the rectifier circuit 6 of the Shaoshan 4 electric locomotive. This solves the problem that existing fixed signal triggering devices cannot adapt to the bridge control logic of specific models and are prone to triggering failure or false triggering. The improved signal adaptability ensures the stable injection of high-level bit and high-current virtual operating condition signals, enabling the three-section bridge opening logic to be triggered accurately and reliably. This ensures the smooth conduct of the three-section bridge opening test in the depot and improves the versatility of the testing device and the accuracy of the test results.

[0030] Example 2

[0031] like Figure 2 As shown, this embodiment provides a full-condition testing method for the three-section unequal-division semi-controlled bridge rectifier circuit of the Shaoshan 4 electric locomotive, based on the testing device of Embodiment 1, including the following steps: S1 device connection and initialization: Connect the dynamic load adjustment unit 1, signal trigger conversion unit 2 and key parameter detection unit 3 to the electric locomotive, set the initial voltage and current parameters, and ensure that the initial values ​​are lower than the three-section bridge opening threshold. S2 Bridge Opening Condition Trigger: Signal Trigger Conversion Unit 2 synchronously sends a high-level high-current trigger signal to gradually increase the output current of Dynamic Load Adjustment Unit 1 at a preset rate until the three-segment bridge opening threshold is reached; in this step, the current increase rate is 5-10A / s to ensure the smooth triggering of the three-segment bridge opening action and avoid the impact of sudden current changes on the circuit.

[0032] S3 Multi-condition Simulation Verification: Simulates four operating conditions in sequence: locomotive start-up, constant speed operation, speed regulation, and braking. Current and voltage data are collected in real time through the key parameter detection unit 3 to confirm the effectiveness of the rectification function and simultaneously record the engagement status of the three-section bridge contactor. The continuous test time for each operating condition in this step is no less than 3 minutes, and the key parameter detection unit 3 collects data every 100ms to ensure the completeness of operating condition coverage and the continuity of data.

[0033] S4 Fault Simulation and Protection Verification: Using a detection device to simulate three types of faults—open circuit of rectifier components, short circuit of rectifier components, and abnormal trigger signal—the action response time of the built-in protection device of the rectifier circuit is recorded to verify the power synchronous cut-off function of the interlocking protection mechanism of the detection device. S5 Cyclic Stability Test: Repeat steps S1-S4 to complete 3 full cycles of the test, and summarize all test parameters and status records. S6 Data Processing and Judgment: If all parameters meet the preset standards, the rectifier circuit is deemed qualified; if any parameters exceed the standards, the fault point is located and the circuit is repaired before the above test procedure is repeated.

[0034] Specifically, the method in this embodiment constructs a standardized testing process of device connection, bridge opening triggering, multi-condition verification, fault simulation, cyclic testing, and data judgment. This solves the problems of non-standard and missing steps in existing testing processes, making the testing process replicable and traceable. The multi-condition simulation step ensures that the performance of the three bridge sections can be verified in all operating scenarios. The fault simulation step can expose latent faults such as open circuit / short circuit of rectifier components and abnormal trigger signals in advance. The three cyclic tests strengthen the verification of the working stability of the three bridge sections. The data-driven judgment rules avoid the subjectivity of manual judgment, comprehensively improve the accuracy and reliability of rectifier circuit testing, and effectively reduce the risk of sudden failures after the locomotive goes online.

[0035] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A full-condition testing device for the three-section unequal-division semi-controlled bridge rectifier circuit of the Shaoshan 4 electric locomotive, characterized in that, include: The dynamic load adjustment unit (1) is electrically connected to the locomotive rectifier circuit (6) and is used to simulate the equivalent load change of the traction motor under different traction states under static conditions in the depot. The signal triggering conversion unit (2) is electrically connected to the locomotive traction system and is used to inject high-level high-current virtual operating condition signals into the locomotive traction system to forcibly trigger the three-segment bridge opening logic. The key parameter detection unit (3) is used to synchronously collect the bridge arm current, bridge arm voltage and contactor engagement status, and automatically determine whether the three-section bridge opening function is qualified based on the collected data.

2. The full-condition testing device for the three-section unequal-division semi-controlled bridge rectifier circuit of the Shaoshan 4 electric locomotive according to claim 1, characterized in that, The dynamic load adjustment unit (1) is electrically connected to the locomotive rectifier circuit (6) through the tooling connector (4). It is equipped with an adjustable resistive load and inductive load combination module, which can simulate the gradient rise, stability maintenance, fluctuation adjustment and reverse switching of load current, and adapt to the load characteristics of the four core working conditions of locomotive starting, constant speed operation, speed regulation and braking.

3. The full-condition testing device for the three-section unequal-division semi-controlled bridge rectifier circuit of the Shaoshan 4 electric locomotive according to claim 1, characterized in that, The key parameter detection unit (3) consists of a current transformer, a voltage transformer and an optical fiber voltage probe. The current transformer is used to measure the bridge arm current, the voltage transformer is used to measure the bridge arm voltage, and the optical fiber voltage probe is used to measure the engagement state of the three-section bridge contactor.

4. The full-condition testing device for the three-section unequal-division semi-controlled bridge rectifier circuit of the Shaoshan 4 electric locomotive according to claim 1, characterized in that, The trigger signal amplitude and frequency of the signal trigger conversion unit (2) are adjustable and are matched with the bridge control logic parameters of the electric locomotive rectifier circuit (6).

5. A method for full-condition testing of the three-section unequal-division semi-controlled bridge rectifier circuit of a Shaoshan 4 electric locomotive, based on the testing device described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Connect the dynamic load adjustment unit (1), signal trigger conversion unit (2) and key parameter detection unit (3) to the electric locomotive, set the initial voltage and current parameters, and the initial values ​​are lower than the three-section bridge opening threshold. S2, Signal trigger conversion unit (2) synchronously sends high-level high current trigger signal to gradually increase the output current of dynamic load adjustment unit (1) at a preset rate until the three-segment bridge opening threshold is reached; S3. Simulate the four working conditions of locomotive starting, constant speed operation, speed regulation and braking in sequence. Collect current and voltage data in real time through the key parameter detection unit (3) to confirm the effectiveness of the rectification function and record the engagement status of the three bridge contactors simultaneously. S4. Using a detection device to simulate three types of faults: open circuit of rectifier components, short circuit of rectifier components, and abnormal trigger signal, record the action response time of the built-in protection device of the rectifier circuit respectively, and verify the power synchronous cut-off function of the interlocking protection mechanism of the detection device. S5. Repeat steps S1-S4 to complete 3 full cycle tests, and summarize all test parameters and status records. S6. If all parameters meet the preset standards, the rectifier circuit is deemed qualified; if any parameters exceed the standards, locate the fault point, repair it, and repeat the above test procedure.

6. The full-condition testing method according to claim 5, characterized in that, The current boost rate in step S2 is 5-10 A / s.

7. The full-condition testing method according to claim 5, characterized in that, In step S3, the continuous test time for each working condition shall not be less than 3 minutes, and the key parameter detection unit (3) shall collect data once every 100ms.

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