Locomotive CI contactor test system

Abstract

The utility model relates to the technical field of locomotives, in particular to a locomotive CI contactor test system, which comprises a contactor, a driver controller, a direct-current power supply, a timer and a resistance tester, and is characterized in that the contactor is electrically connected with the driver controller through an auxiliary interlock; the direct-current power supply is electrically connected with the auxiliary interlock and the driver controller respectively; the timer is electrically connected with the auxiliary interlock and the driver controller, and the timer is electrically connected with the driver controller; and the resistance tester is electrically connected with the contactor. The locomotive CI contactor test system can rapidly and accurately test the parameters of the CI contactor, and realizes the comprehensive test of the parameters of the CI contactor, thereby providing a diagnosis basis for the fault of the CI contactor.

Description

Technical Field

[0001] This utility model relates to the field of locomotive technology, and in particular to a locomotive CI contactor testing system. Background Technology

[0002] The HXD3C electric locomotive is a 7200kW AC drive six-axle mainline passenger and freight electric locomotive developed based on the HXD3 and HXD3B electric locomotives. By replacing the transformer with one that adds power supply windings, and by adding train power supply cabinets, power sockets, passenger and freight transfer switches, and dual-pipe air supply devices, the locomotive is equipped with the function of hauling passenger trains.

[0003] The CI contactor of the HXD3C locomotive is an imported product from Toshiba of Japan. Due to technological embargoes, only Japan has testing equipment; no domestic (including Toshiba China) possesses related portable and ground-based testing equipment. Environmental factors, particularly the hot and humid climate in southern regions, significantly impact contactor lifespan, leading to a year-on-year increase in CI contactor failure rates. Currently, maintenance and diagnosis of CI contactors primarily rely on empirical judgment. For example, Liu Mingjie and Sun Min of Jinan West Locomotive Depot, through studying fault records and conducting on-site disassembly of working contactors, proposed methods for diagnosing contactor adhesion faults and provided maintenance suggestions. Bai Wentao and others from Liuzhou Railway Vocational Technical College, through studying the working principle of the SS7 locomotive electro-pneumatic contactor and analyzing actual on-site failure cases, proposed relevant maintenance suggestions. Chen Chunjun and Zan Jianhua, through studying contactor failure mechanisms, established a contactor performance degradation model and conducted simulation verification. These studies are all based on the collation and analysis of existing contactor working principles and related fault data.

[0004] Therefore, the main drawback of existing technical solutions is their reliance on theoretical research, primarily based on equipment principle analysis and empirical judgment. They lack a comprehensive, accurate, and systematic testing scheme for the overall performance of CI contactors, and research on testing equipment for CI contactors is limited, particularly on maintenance testing equipment for the CI contactors of the HXD3C locomotive. The main performance parameters of CI contactors include the minimum pull-in voltage, pull-in time at different voltages, disconnection time at standard operating voltage, and contact resistance. Testing these parameters is complex and difficult to achieve the required conditions. Therefore, existing technical solutions rarely diagnose faults based on parameter measurements, or they rely solely on a single, highly correlated parameter instead of a holistic approach. While a single parameter can reflect some issues, the CI contactor is a whole, and its parameters are interconnected; testing a single parameter alone cannot fully reflect the true state of the equipment. In summary, current technical solutions cannot achieve comprehensive testing of CI contactor parameters, resulting in high testing difficulty and low efficiency. Utility Model Content

[0005] To address the aforementioned issues, this invention provides a locomotive CI contactor testing system that can quickly and accurately test the parameters of the CI contactor, achieving comprehensive testing of the CI contactor parameters and thus providing a basis for diagnosing CI contactor faults.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0007] A locomotive CI contactor testing system includes a contactor, a driver controller, a DC power supply, a timer, and a resistance tester.

[0008] The contactor is electrically connected to the driver's controller via an auxiliary interlock;

[0009] The DC power supply is electrically connected to the auxiliary interlock and the driver controller, respectively.

[0010] The timer is electrically connected to the auxiliary interlock and the driver controller respectively, and the timer is electrically connected to the driver controller;

[0011] The resistance tester is electrically connected to the contactor.

[0012] Furthermore, the auxiliary interlock is electrically connected to the timer via a programmable relay, and the auxiliary interlock is connected in series with the programmable relay and the resistance tester.

[0013] Furthermore, the first switch contact of the auxiliary interlock is electrically connected to the normally closed NC terminal of the programmable relay and then connected to the timer; the second switch contact of the auxiliary interlock is electrically connected to the normally open NO terminal of the programmable relay and then connected to the resistance tester, and the resistance tester is electrically connected to the third switch contact of the auxiliary interlock.

[0014] Furthermore, it also includes a host computer, which is communicatively connected to the DC power supply, the timer, the resistance tester, and the programmable relay.

[0015] Furthermore, the timer is electrically connected to the bypass contact of the microswitch of the controller.

[0016] The beneficial effects of this utility model are:

[0017] By setting an auxiliary interlock to input control signals to the contactor, the contactor's parameters can be measured. Under the action of a DC power supply, voltage can be provided to the controller and the auxiliary interlock. By controlling the DC power supply to sequentially increase the voltage, the minimum pull-in voltage of the contactor can be tested. By controlling the DC power supply at different voltages and simultaneously using a timer to time the energization time of the auxiliary interlock coil, the pull-in time of the contactor under different voltages can be tested. Similarly, by controlling the DC power supply at different voltages and simultaneously using a timer to time the de-energization time of the auxiliary interlock coil, the release time of the contactor under different voltages can be tested. A resistance tester can be used to measure the contact resistance of the contactor. This invention enables comprehensive testing of CI contactor parameters with high efficiency, improving the maintenance efficiency of personnel. Attached Figure Description

[0018] Figure 1 This is a structural block diagram of a locomotive CI contactor testing system according to a preferred embodiment of the present invention.

[0019] In the diagram, 1-Contactor, 11-Auxiliary Interlock, 2-Controller, 3-DC Power Supply, 4-Timer, 5-Resistance Tester, 6-Programmable Relay, 7-Host Computer, 8-Test Module, 81-Pull-in Voltage Test Submodule, 82-Pull-in Time Test Submodule, 83-Release Time Test Submodule, 84-Contact Resistance Test Submodule. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Please refer to Figure 1 The preferred embodiment of the locomotive CI contactor testing system of this utility model is characterized by comprising a contactor 1, a driver controller 2, a DC power supply 3, a timer 4, and a resistance tester 5.

[0024] Contactor 1 is electrically connected to controller 2 via auxiliary interlock 11.

[0025] DC power supply 3 is electrically connected to auxiliary interlock 11 and driver controller 2 respectively.

[0026] The timer 4 is electrically connected to the auxiliary interlock 11 and the driver controller 2 respectively, and the timer 4 is electrically connected to the driver controller 2; in this embodiment, the timer 4 is connected to the bypass contact of the micro switch of the driver controller 2.

[0027] The resistance tester 5 is electrically connected to the contactor 1.

[0028] In this embodiment, the auxiliary interlock 11 is electrically connected to the timer 4 via the programmable relay 6, and the auxiliary interlock 11 is connected in series with the programmable relay 6 and the resistance tester 5.

[0029] The first switch contact of the auxiliary interlock 11 is electrically connected to the normally closed NC terminal of the programmable relay 6 and then connected to the timer 4; the second switch contact of the auxiliary interlock 11 is electrically connected to the normally open NO terminal of the programmable relay 6 and then connected to the resistance tester 5, and the resistance tester 5 is electrically connected to the third switch contact of the auxiliary interlock 11.

[0030] In this embodiment, an auxiliary interlock 11 is set to input a control signal to the contactor 1 to assist in measuring the parameters of the contactor 1. Under the action of the DC power supply 3, voltage can be provided to the controller 2 and the auxiliary interlock 11. By controlling the DC power supply 3 to increase the voltage sequentially, the minimum pull-in voltage of the contactor 1 can be tested and obtained. By controlling the DC power supply 3 at different voltages and using the timer 4 to time the energization time of the coil of the auxiliary interlock 11, the pull-in time of the contactor at different voltages can be tested. By controlling the DC power supply 3 at different voltages and using the timer 4 to time the de-energization time of the coil of the auxiliary interlock 11, the release time of the contactor at different voltages can be tested. The contact resistance of the contactor can be measured by the resistance tester 5.

[0031] This embodiment also includes a host computer 7, which is communicatively connected to a DC power supply 3, a timer 4, a resistance tester 5, and a programmable relay 6.

[0032] The contactor 1 test in this embodiment includes minimum pull-in voltage test, pull-in time test of the contactor under different voltages, release time test of the contactor under different voltages, and contact resistance test of the contactor 1.

[0033] In the minimum pull-in voltage test, the controller 2 is in the closed position. The host computer 7 controls the voltage of the DC power supply 3. When the voltage of the DC power supply 3 reaches the minimum pull-in voltage of the contactor, the coil of the auxiliary interlock 11 is energized so that the switch contact of the auxiliary interlock 11 is pulled in. The host computer 7 records the current voltage of the DC power supply 3 according to the signal of the switch contact of the auxiliary interlock 11 being pulled in.

[0034] In the contactor engagement time test under different voltages, the host computer 7 controls the DC power supply 3 to output different voltages. The controller 2 is in the * position, and the bypass contact of the microswitch of the controller 2 is short-circuited. The timer 4 counts according to the signal from the controller 2 until the coil of the auxiliary interlock 11 is energized, the switch contact of the auxiliary interlock 11 closes and short-circuits, and the timing ends, obtaining the contactor engagement time under the current voltage.

[0035] In the test of the release time of the contactor under different voltages, the host computer 7 controls the DC power supply 3 to output different voltages, the driver controller 2 is in position 0, and the bypass contact of the micro switch of the driver controller 2 is open. The timer 4 counts according to the signal of the driver controller 2 until the coil of the auxiliary interlock 11 is de-energized, the switch contact of the auxiliary interlock 11 is closed, the timing ends, and the release time of the contactor under the current voltage is obtained.

[0036] In the time test, the two sets of GPIO pins of timer 4 are set to short-circuit trigger and connected to the driver controller 2 and auxiliary interlock 11 respectively. When the relevant pin detects the closing or opening of the driver controller 2 node, timer 4 is triggered to start timing. When the auxiliary interlock 11 is detected to be closed or opened, timer 4 is triggered to stop timing (this process does not require intervention from the host computer software; only the operator needs to operate the driver controller handle). The measured time is automatically saved in timer 4. The operator can send a read command to timer 4 through the host computer 7. After receiving the read command, timer 4 returns the saved time data frame. The host computer 7 uses the "string truncation" tool to truncate the high-order bits (input parameters: start bit 5, starting from bit 6; byte length 1, truncation length of 1 byte) and low-order bits (input parameters: start bit 5, starting from bit 6; byte length 1, truncation length of 1 byte) of the timer's return frame. Then, the "type conversion" tool is used to convert the data to an unsigned single-byte integer format. Finally, the high-order data is multiplied by 100 + the low-order data to convert to milliseconds and displayed on the host computer 7. (Example: If the time is 1.922 seconds, then the high-order digit is 19, the low-order digit is 22, and the final result is 19*100+12=1922)

[0037] In the contact resistance test of contactor 1, the controller 2 is in the * position and contactor 1 is energized. The host computer 7 sends a measurement signal to the programmable relay 6, and the corresponding switch contact of the programmable relay 6 closes. In this embodiment, the second switch contact of the programmable relay 6 closes to form the contact resistance measurement circuit of contactor 1. The host computer 7 sends a sequencing signal to the resistance tester 5, and the resistance tester 5 measures and returns the data to the host computer 7 to obtain the contact resistance data.

[0038] The host computer 7 first sends an action command to the programmable relay 6. The programmable relay 6 activates, forming the resistance test circuit, and sends a successful action feedback signal to the host computer 7. After receiving the feedback signal, the host computer 7 displays relevant indicator signals on the human-machine interface. When the operator performs the test on the host computer 7, they send a contact resistance test command to the resistance tester 5. The resistance tester 5 triggers and executes the test, returning the obtained data to the host computer 7 in the form of a hexadecimal string frame. The host computer 7 first uses the "string truncation" tool to truncate the data bit frame in the returned frame (input parameters: start bit 3, starting from the 4th bit; byte length 4, truncation length of 4 bytes), and then uses the "type casting" tool to convert the truncated hexadecimal string into a single-precision floating-point number. Then subtract 0.1 ohms (a fixed error value (resistance of wiring and switches)) from this data, and then determine whether the difference is less than 2 ohms (generally, the maximum contact resistance does not exceed 2 ohms). If it is less, multiply the difference by 1000 to convert it to milliohms and display it on the human-machine interface. Otherwise, display INF (infinity, meaning unqualified) on the interface.

Claims

1. A locomotive CI contactor testing system, characterized in that, Includes a contactor (1), a controller (2), a DC power supply (3), a timer (4), and a resistance tester (5). The contactor (1) is electrically connected to the driver (2) via an auxiliary interlock (11); The DC power supply (3) is electrically connected to the auxiliary interlock (11) and the driver controller (2) respectively; The timer (4) is electrically connected to the auxiliary interlock (11) and the driver controller (2) respectively, and the timer (4) is electrically connected to the driver controller (2); The resistance tester (5) is electrically connected to the contactor (1).

2. The locomotive CI contactor testing system according to claim 1, characterized in that: The auxiliary interlock (11) is electrically connected to the timer (4) via a programmable relay (6), and the auxiliary interlock (11) is connected in series with the programmable relay (6) and the resistance tester (5).

3. The locomotive CI contactor testing system according to claim 2, characterized in that: The first switch contact of the auxiliary interlock (11) is electrically connected to the normally closed NC terminal of the programmable relay (6) and then connected to the timer (4); the second switch contact of the auxiliary interlock (11) is electrically connected to the normally open NO terminal of the programmable relay (6) and then connected to the resistance tester (5), and the resistance tester (5) is electrically connected to the third switch contact of the auxiliary interlock (11).

4. The locomotive CI contactor testing system according to claim 2, characterized in that: It also includes a host computer (7), which is communicatively connected to the DC power supply (3), the timer (4), the resistance tester (5) and the programmable relay (6).

5. The locomotive CI contactor testing system according to claim 1, characterized in that: The timer (4) is electrically connected to the bypass contact of the microswitch of the controller (2).

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