Locomotive CI contactor test system

Abstract

The invention 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. According to the locomotive CI contactor test system, the parameters of the CI contactor can be rapidly and accurately tested, and the comprehensive test of the parameters of the CI contactor is realized, so that a diagnosis basis is provided for the fault of the CI contactor.

Description

Technical Field

[0001] The present invention relates to the technical field of locomotives, and in particular to a locomotive CI contactor test system. Background Art

[0002] The HXD3C type electric locomotive is an AC drive six-axle 7200kW main line passenger and freight general electric locomotive developed on the basis of the HXD3 type and HXD3B type electric locomotives. By replacing the transformer with an additional power supply winding, adding a train power supply cabinet, a power supply socket, a passenger and freight conversion switch, a dual-pipe air supply device, etc., the locomotive has the function of pulling passenger trains.

[0003] The CI contactor of the HXD3C type locomotive is an imported product from Toshiba of Japan. Due to technology blockade, only Japan has test equipment, and there is no relevant portable and ground detection test equipment in China (including Toshiba China Co., Ltd.). Due to environmental problems, the humid and hot environment in the southern region has a greater impact on the service life of the contactor, resulting in an increasing failure rate of the CI contactor year by year. At present, the overhaul and diagnosis of the CI contactor mainly rely on empirical judgment. For example, Liu Mingjie and Sun Min from Jinan West Locomotive Depot studied the fault records of the working contactor and carried out on-site disassembly, and put forward a judgment method and overhaul suggestions for contactor adhesion faults. Bai Wentao et al. from Liuzhou Railway Vocational and Technical College studied the working principle of the electro-pneumatic contactor of the SS7 type locomotive, analyzed the on-site actual application fault cases, and put forward relevant overhaul suggestions. Chen Chunjun and Zan Jianhua studied the failure mechanism of the contactor, established a performance degradation model of the contactor and carried out simulation verification. These studies are all based on the collation and analysis of the existing working principle of the contactor and relevant fault data.

[0004] It can be seen that the main disadvantages of the existing technical solutions are relatively biased towards theoretical research, mainly based on equipment principle analysis and empirical judgment, without establishing a comprehensive, accurate and systematic test plan for the overall performance of the CI contactor, less research on the detection and test equipment for the CI contactor, especially the research on the overhaul and test equipment for the CI contactor of the HXD3C locomotive. The main performance parameters of the CI contactor include the minimum pull-in voltage of the contactor, the pull-in time at different voltages, the opening time at the standard working voltage, and the contact resistance of the contactor contacts. The testing methods of these parameters are relatively complex and it is not easy to achieve the test conditions. Therefore, in the existing technical solutions, it is rarely based on parameter measurement to diagnose faults, or only uses a parameter with a relatively strong correlation as the diagnosis basis, rather than grasping from the overall. Although a single parameter can reflect some problems, since the CI contactor is a whole and there is a certain correlation between its various parameters, testing a single parameter alone cannot fully reflect the true state of the equipment. Generally speaking, the current technical solutions cannot complete the comprehensive test of the CI contactor parameters, with large testing difficulty and low efficiency. Summary of the Invention

[0005] To solve the above problems, the present invention provides a locomotive CI contactor test system, which can quickly and accurately test the parameters of the CI contactor, realize a comprehensive and integrated test of the CI contactor parameters, and thus provide a diagnostic basis for the faults of the CI contactor.

[0006] The technical solution adopted by the present invention to solve the above problems is as follows:

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

[0008] The contactor is electrically connected to the controller through an auxiliary interlock.

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

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

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

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

[0013] Further, the first switch contact of the auxiliary interlock is electrically connected to the NC normally closed end of the programmable relay and then connected to the timer; the second switch contact of the auxiliary interlock is electrically connected to the NO normally open end 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] Further, it further includes a host computer, and the host computer is communicatively connected to the DC power supply, the timer, the resistance tester and the programmable relay respectively.

[0015] Further, the test system further includes a test module, and the test module includes a pull-in voltage test sub-module, a pull-in time test sub-module, a release time test sub-module and a contact resistance test sub-module.

[0016] The pull-in voltage test sub-module is used for the pressure control of the DC power supply. When the switch contact of the auxiliary interlock is pulled in, the pull-in voltage test sub-module records the current voltage to obtain the minimum pull-in voltage of the contactor.

[0017] The closing time test sub-module is used to control the different output voltages of the DC power supply, and the closing time test sub-module calculates the closing time of the contactor at different voltages through the timer;

[0018] The opening time test sub-module is used to control the different output voltages of the DC power supply, and the opening time test sub-module calculates the opening time of the contactor at different voltages through the timer;

[0019] The contact resistance test sub-module is used to control the programmable relay, and the contact resistance test sub-module calculates the contact resistance of the contactor according to the resistance tester.

[0020] Further, when the closing voltage test sub-module performs the minimum closing voltage test, the controller is in the closed position. When the voltage of the DC power supply reaches the minimum closing voltage of the contactor, the coil of the auxiliary interlock is excited, so that the switch contacts of the auxiliary interlock are closed. The closing voltage test sub-module records the current voltage of the DC power supply according to the signal that the switch contacts of the auxiliary interlock are closed.

[0021] Further, when the closing time test sub-module performs the closing time test of the contactor at different voltages, the controller is in the * position, and the micro-switch bypass contact of the controller is short-circuited. The timer starts timing according to the signal of the controller until the coil of the auxiliary interlock is powered on, and the switch contacts of the auxiliary interlock are closed and short-circuited. The closing time test sub-module controls the timer to end timing according to the signal of the auxiliary interlock to obtain the closing time of the contactor at the current voltage.

[0022] Further, when the opening time test sub-module performs the opening time test of the contactor at different voltages, the controller is in the 0 position, and the micro-switch bypass contact of the controller is disconnected. The timer starts timing according to the signal of the controller until the coil of the auxiliary interlock is powered off, and the switch contacts of the auxiliary interlock are opened. The opening time test sub-module controls the timer to end timing according to the signal of the auxiliary interlock to obtain the opening time of the contactor at the current voltage.

[0023] Further, when the contact resistance test sub-module performs the contact resistance test of the contactor, the controller is in the * position and the contactor is engaged. The contact resistance test sub-module sends a measurement signal to the programmable relay, and the corresponding switch contact of the programmable relay closes to form a contact resistance measurement circuit of the contactor. The contact resistance test sub-module sends a sequencing signal to the resistance tester, and the resistance tester measures and obtains data and returns it to the contact resistance test sub-module to obtain the contact resistance data.

[0024] Further, the resistance tester returns the measured measurement data to the contact resistance test sub-module in the form of a hexadecimal string frame. The contact resistance test sub-module converts the measurement data into a single-precision floating-point number, and performs a fixed error process on the single-precision floating-point number to obtain difference data. The contact resistance test sub-module judges the difference data. When the difference data is less than the difference threshold, the difference data is subjected to unit conversion to obtain the contact resistance data; when the difference data is greater than the difference threshold, the contact resistance test sub-module sends an abnormal signal.

[0025] The beneficial effects of the present invention are as follows:

[0026] By setting an auxiliary interlock to input a control signal to the contactor to assist in measuring the parameters of the contactor, under the action of a DC power supply, it can provide voltage for the controller and the auxiliary interlock. By controlling the DC power supply to step up the voltage in sequence, the minimum pull-in voltage of the contactor can be tested; by controlling the DC power supply at different voltages and using a timer to measure the energization time of the coil of the auxiliary interlock at the same time, the pull-in time of the contactor at different voltages can be tested; by controlling the DC power supply at different voltages and using a timer to measure the power-off time of the coil of the auxiliary interlock at the same time, the release time of the contactor at different voltages can be tested; the contact resistance of the contactor can be measured by a resistance tester. The present invention can comprehensively and comprehensively test the parameters of the CI contactor, and has high test efficiency, improving the maintenance efficiency of the staff. Description of the Drawings

[0027] Figure 1 It is a structural block diagram of a locomotive CI contactor test system according to a preferred embodiment of the present invention.

[0028] In the figure, 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 sub-module, 82 - pull-in time test sub-module, 83 - release time test sub-module, 84 - contact resistance test sub-module. Detailed Embodiments

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used herein in the description of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] Please refer to Figure 1 , a locomotive CI contactor test system according to a preferred embodiment of the present invention, characterized in that it includes a contactor 1, a controller 2, a DC power supply 3, a timer 4 and a resistance tester 5.

[0033] The contactor 1 is electrically connected to the controller 2 through an auxiliary interlock 11.

[0034] The DC power supply 3 is electrically connected to the auxiliary interlock 11 and the controller 2 respectively.

[0035] The timer 4 is electrically connected to the auxiliary interlock 11 and the controller 2 respectively, and the timer 4 is electrically connected to the controller 2; in this embodiment, the timer 4 is connected to the microswitch bypass contact of the controller 2.

[0036] The resistance tester 5 is electrically connected to the contactor 1.

[0037] In this embodiment, the auxiliary interlock 11 is electrically connected to the timer 4 through a programmable relay 6, and the auxiliary interlock 11 is in series with the programmable relay 6 and the resistance tester 5.

[0038] The first switch contact of the auxiliary interlock 11 is electrically connected to the NC normally closed 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 NO normally open 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.

[0039] In this embodiment, by setting the auxiliary interlock 11 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 for the controller 2 and the auxiliary interlock 11. By controlling the DC power supply 3 to boost the voltage in sequence, the minimum pull-in voltage of the contactor 1 can be tested and obtained; by controlling the DC power supply 3 to be at different voltages, and at the same time 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 to be at different voltages, and at the same time 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.

[0040] This embodiment further includes a host computer 7, and the host computer 7 is communicatively connected to the DC power supply 3, the timer 4, the resistance tester 5, and the programmable relay 6 respectively.

[0041] The test system further includes a test module 8, and the test module 8 includes a pull-in voltage test sub-module 81, a pull-in time test sub-module 82, a release time test sub-module 83, and a contact resistance test sub-module 84. The test system of this embodiment is set in the host computer 7.

[0042] The pull-in voltage test sub-module 81 is used for the pressurization control of the DC power supply 3. When the switch contact of the auxiliary interlock 11 is pulled in, the pull-in voltage test sub-module 81 records the current voltage to obtain the minimum pull-in voltage of the contactor.

[0043] When the pull-in voltage test sub-module 81 performs the minimum pull-in voltage test, the controller 2 is in the closed position. 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 excited to make the switch contact of the auxiliary interlock 11 pulled in, and the pull-in voltage test sub-module 81 records the current voltage of the DC power supply 3 according to the signal that the switch contact of the auxiliary interlock 11 is pulled in.

[0044] The pull-in time test sub-module 82 is used for the control of different output voltages of the DC power supply 3, and the pull-in time test sub-module 82 calculates the pull-in time of the contactor at different voltages through the timer 4.

[0045] When the pull-in time test sub-module 82 conducts the pull-in time test of the contactor 1 under different voltages, the controller 2 is in the * position, and the micro-switch bypass contact of the controller 2 is short-circuited. The timer 4 times according to the signal of the controller 2 until the coil of the auxiliary interlock 11 is energized and the switch contact of the auxiliary interlock 11 is pulled in and short-circuited. The pull-in time test sub-module 82 controls the timer 4 to end timing according to the signal of the auxiliary interlock 11 to obtain the pull-in time of the contactor under the current voltage.

[0046] The release time test sub-module 83 is used to control the different output voltages of the DC power supply 3, and the release time test sub-module 83 calculates the release time of the contactor under different voltages through the timer 4.

[0047] When the release time test sub-module 83 conducts the release time test of the contactor 1 under different voltages, the controller 2 is in the 0 position, and the micro-switch bypass contact of the controller 2 is disconnected. The timer 4 times according to the signal of the controller 2 until the coil of the auxiliary interlock 11 is de-energized and the switch contact of the auxiliary interlock 11 is pulled in and disconnected. The release time test sub-module 83 controls the timer 4 to end timing according to the signal of the auxiliary interlock 11 to obtain the release time of the contactor under the current voltage.

[0048] During the pull-in time test and the release time test, two groups of GPIO pins of the timer 4 are set to short-circuit trigger and are respectively connected to the controller 2 and the auxiliary interlock 11. When the relevant pins detect the closing or opening of the controller 2 node, the timer 4 is triggered to start timing. When the closing or opening of the auxiliary interlock 11 is detected, the timer 4 is triggered to end timing. This process does not require the intervention of the host computer software, and only the operator needs to operate the controller 2 handle.

[0049] According to the signal of the auxiliary interlock 11, the timer 4 sends the data to the pull-in time test sub-module 82 or the release time test sub-module 83. The pull-in time test sub-module 82 or the release time test sub-module 83 respectively intercepts the high bit (input parameter: starting bit 5, starting from the 6th bit; byte length 1, intercepting 1 byte length) and the low bit (input parameter: starting bit 5, starting from the 6th bit; byte length 1, intercepting 1 byte length) in the return frame of the timer 4, and then converts the data into an unsigned single-byte integer format through forced type conversion, and then multiplies the high-bit data by 100 + the low-bit data to convert it into milliseconds and displays it on the human-machine interface. (Example: If the time is 1.922 seconds, the high-bit data is 19, the low-bit data is 22, and the final result is 19 * 100 + 22 = 1922)

[0050] The contact resistance test sub-module 84 is used to control the programmable relay 6, and the contact resistance test sub-module 84 calculates the contact resistance of the contactor 1 according to the resistance tester 5.

[0051] The contact resistance test sub-module 84 is performing the contact resistance test of the contactor 1. The controller 2 is in the * position, and the contactor 1 is closed. The contact resistance test sub-module 84 sends a measurement signal to the programmable relay 6. The corresponding switch contact of the programmable relay 6 is closed. In this embodiment, the second switch contact of the programmable relay 6 is closed to form the contact resistance measurement circuit of the contactor 1. And the contact resistance test sub-module 84 sends a sequencing signal to the resistance tester 5. The resistance tester 5 measures the obtained data and returns it to the contact resistance test sub-module 84 to obtain the data of the contact resistance.

[0052] The resistance tester 5 returns the measured data to the contact resistance test sub-module 84 in the form of a hexadecimal string frame. The contact resistance test sub-module 84 converts the measurement data into a single-precision floating-point number, and performs a fixed error process on the single-precision floating-point number to obtain the difference data. The contact resistance test sub-module 84 judges the difference data. When the difference data is less than the difference threshold, the difference data is subjected to unit conversion to obtain the data of the contact resistance; when the difference data is greater than the difference threshold, the contact resistance test sub-module 84 issues an abnormal signal.

[0053] In the contact resistance test, the contact resistance test sub-module 84 first intercepts the data bit frame in the return frame (input parameters: starting bit 3, starting from the 4th bit; byte length 4, intercepting 4 byte lengths), and then converts the intercepted hexadecimal string into a single-precision floating-point number. Then subtract 0.1 ohm (fixed error value (resistance of wiring and switch)) from this data, and then judge whether the obtained difference is less than 2 ohms (the maximum value of the general contact resistance does not exceed 2 ohms). If it is less, multiply the difference by 1000 and convert it to milliohms for display on the human-machine interface. Otherwise, display INF (infinity, meaning unqualified) on the interface to indicate an abnormal signal.

Claims

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

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

3. The locomotive CI contactor test system according to claim 2, characterized in that: The first switch contact of the auxiliary interlock (11) is electrically connected to the NC normally closed end 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 NO normally open end 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 test system according to claim 2, characterized in that: It further includes a host computer (7), and the host computer (7) is communicatively connected to the DC power supply (3), the timer (4), the resistance tester (5) and the programmable relay (6) respectively.

5. The locomotive CI contactor test system according to claim 2, characterized in that: The test system further includes a test module (8), and the test module (8) includes a pull-in voltage test sub-module (81), a pull-in time test sub-module (82), a release time test sub-module (83) and a contact resistance test sub-module (84). The pull-in voltage test sub-module (81) is used for the pressurization control of the DC power supply (3). When the switch contact of the auxiliary interlock (11) pulls in, the pull-in voltage test sub-module (81) records the current voltage to obtain the minimum pull-in voltage of the contactor. The pull-in time test sub-module (82) is used for the control of different output voltages of the DC power supply (3), and the pull-in time test sub-module (82) calculates the pull-in time of the contactor at different voltages through the timer (4). The release time test sub-module (83) is used for the control of different output voltages of the DC power supply (3), and the release time test sub-module (83) calculates the release time of the contactor at different voltages through the timer (4). The contact resistance test sub-module (84) is used for the control of the programmable relay (6), and the contact resistance test sub-module (84) calculates the contact resistance of the contactor (1) according to the resistance tester (5).

6. The locomotive CI contactor test system according to claim 5, characterized in that: When the minimum pull-in voltage test is performed by the pull-in voltage test sub-module (81), the controller (2) is in the closed position. 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 excited, so that the switch contacts of the auxiliary interlock (11) are closed. The pull-in voltage test sub-module (81) records the current voltage of the DC power supply (3) according to the signal that the switch contacts of the auxiliary interlock (11) are closed.

7. The locomotive CI contactor test system according to claim 5, wherein: When the pull-in time test of the contactor (1) at different voltages is performed by the pull-in time test sub-module (82), the controller (2) is in the * position, and the micro-switch bypass contacts of the controller (2) are short-circuited. The timer (4) starts timing according to the signal of the controller (2) until the coil of the auxiliary interlock (11) is powered on, and the switch contacts of the auxiliary interlock (11) are closed and short-circuited. The pull-in time test sub-module (82) controls the timer (4) to end the timing according to the signal of the auxiliary interlock (11) to obtain the pull-in time of the contactor at the current voltage.

8. A locomotive CI contactor test system according to claim 5, characterized in that: When the release time test of the contactor (1) at different voltages is performed by the release time test sub-module (83), the controller (2) is in the 0 position, and the micro-switch bypass contacts of the controller (2) are open. The timer (4) starts timing according to the signal of the controller (2) until the coil of the auxiliary interlock (11) is powered off, and the switch contacts of the auxiliary interlock (11) are closed and opened. The release time test sub-module (83) controls the timer (4) to end the timing according to the signal of the auxiliary interlock (11) to obtain the release time of the contactor at the current voltage.

9. The locomotive CI contactor test system according to claim 5, characterized in that: When the contact resistance test of the contactor (1) is performed by the contact resistance test sub-module (84), the controller (2) is in the * position, and the contactor (1) is closed. The contact resistance test sub-module (84) sends a measurement signal to the programmable relay (6), and the corresponding switch contacts of the programmable relay (6) are closed to form a contact resistance measurement circuit of the contactor (1). And the contact resistance test sub-module (84) sends a sequencing signal to the resistance tester (5), and the resistance tester (5) measures the obtained data and returns it to the contact resistance test sub-module (84) to obtain the data of the contact resistance.

10. A locomotive CI contactor test system according to claim 9, characterized in that: The resistance tester (5) returns the measured data in a hexadecimal string frame to the contact resistance test sub-module (84). The contact resistance test sub-module (84) converts the measured data into a single-precision floating-point number, and performs a fixed error process on the single-precision floating-point number to obtain difference data. The contact resistance test sub-module (84) judges the difference data. When the difference data is less than the difference threshold, the difference data is subjected to unit conversion to obtain the data of the contact resistance; When the difference data is greater than the difference threshold, the contact resistance test sub-module (84) issues an abnormal signal.

Images