Automated grounding detection device and method

Abstract

The invention discloses an automated grounding detection device and method. The device comprises a detection circuit, a voltage detection unit, a voltage proportion adjusting unit, an alternating-current and direct-current signal processing unit, an isolation unit and a CPU (central processing unit) control unit, the detection circuit is used for building a corresponding detection loop and settinga sampling resistor, the voltage detection unit is used for detecting voltage of the sampling resistor, the voltage proportion adjusting unit is used for proportionally scaling voltage signal, the alternating-current and direct-current signal processing unit is used for direct-current blocking and alternating-current blocking of input signal, the A / D conversion unit is used for converting analogsignal into digital signal, the isolation unit is used for isolating signals to separate the same, and the CPU control unit is used for performing control calculation on the input signal to acquire agrounding detection result. By the detection device and method, positioning of fault points and judging of fault degree and fault type can be realized accurately, an on-board microcomputer can realizegrounding troubleshooting and dealing directly through a detection result, and efficiency and intelligentization degree of fault dealing can be improved.

Description

technical field [0001] The invention relates to the related technical field of locomotive grounding detection, in particular to an automatic grounding detection device and method. Background technique [0002] There are three types of ground faults for locomotives: auxiliary generator ground faults, battery ground faults, and excitation circuit ground faults; in addition, ground faults are further divided into DC grounding and AC grounding. When a ground fault occurs on a locomotive, how to accurately locate the ground position and determine the type of fault is very important for subsequent maintenance and treatment. In order to detect which point of the line is grounded and the ground fault occurs, all wires need to be removed one by one. , Use an ohmmeter to measure the ground one by one until the ground fault point is found. Or, simply judge whether it is grounded without judging the location or fault type of the ground. [0003] For example: At present, there are two ...

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Problems solved by technology

Or, simply judge whether it is grounded or not, but cannot judge the location of the ground or the type of fault

[0003] For example: At present, there are two main grounding detection methods on diesel locomotives: mechanical grounding relay / current sensor to detect grounding current and grounding test lamp, which can only judge whether there is a grounding phenomenon on the locomotive, but cannot judge the degree and method of grounding. The microcomputer in the computer cannot make different processing according to the degree of grounding

Moreover, these ground detection methods cannot make a quantitative judgment on the extent of the ground fault. The ground detection lamp is usually connected in series at the positive and negative ends of the battery, consisting of two lights, and the middle point is connected to the earth. When there is no ground fault, two The brightness of the lamp is the same, when a ground fault occurs, the brightness changes, one bright and one dark

The grounding relay detection method can only be provided to the locomotive microcomputer system in the form of digital input signals, and the grounding test lamp uses human eyes to judge whether the light is on / off to judge the grounding fault. It can only judge that the locomotive has a grounding fault, but it also cannot locate the specific grounding Fault point, not conducive to troubleshooting

[0004] Therefore, in the process of implementing the present application, the inventor found that the existing grounding detection device or method cannot accurately locate the fault point and the type of grounding fault, let alone judge the severity of the grounding fault, and can only simply use the grounding relay to set the operating current Value, to judge whether the locomotive has a ground fault, or use the ground test lamp to judge whether the light is on or off by human eyes, which will cause the on-board microcomputer to be unable to participate in the ground fault troubleshooting, reducing the intelligence of the locomotive and the efficiency of fault handling

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