Railway locomotive auxiliary circuit grounding detection device

Abstract

The utility model discloses a grounding detection device for an auxiliary circuit of a railway locomotive. The grounding detection device comprises a plurality of loads, an A / D converter, a judging device and a plurality of current detectors, the input end of each current detector is connected with the shell of the corresponding load and is used for acquiring the grounding current leaked from the shell of the load; the input end of the A / D converter is connected with the output end of the current detector, and the A / D converter is used for converting the grounding current into a digital signal from an electric signal; the judger is connected with the output end of the A / D converter and comprises comparators in one-to-one correspondence with the A / D converter, each comparator is internally provided with a threshold value, the comparators are all compared with the corresponding digital signals, when the input digital signals are not larger than the threshold values, the comparators output first signals, and when the input digital signals are larger than the threshold values, the comparators output second signals. And the comparator outputs a second signal so as to simplify the process of ground fault detection and improve the easiness of load detection.

Description

Technical Field

[0001] The utility model relates to the technical field of motor vehicle auxiliary equipment, and specifically relates to a grounding detection device for the auxiliary circuit of a railway locomotive. Background Art

[0002] In winter, the climate is cold. Due to the influence of poor bearing lubrication of each fan in the locomotive auxiliary system at low temperature, the problem of fan bearing failure is prominent. After the bearing is damaged, the stator and rotor of the fan motor scrape against each other, causing the auxiliary circuit to be grounded and the locomotive to trip the main breaker. From the statistics from 2020 to 2022, more than 50 cases occur every year, accounting for more than 80% of the operating faults of electric locomotives, becoming the most prominent problem interfering with the transportation order and affecting transportation safety.

[0003] The common method for detecting the grounding fault of the auxiliary circuit of a railway locomotive is mainly carried out through manual inspection. Specifically, when a grounding fault occurs in the auxiliary circuit of the locomotive, the crew needs to check each load device one by one, and judge the faulty device and deal with it by observing the operating condition of the device and measuring the insulation resistance of the device.

[0004] However, since there are more than 10 loads in the auxiliary circuit of the locomotive, such as traction fans, composite fans, mechanical room fans, oil pumps, etc., it is difficult for the crew to find and judge when a fault occurs. Content of the Utility Model

[0005] In order to solve the above problems and deficiencies existing in the prior art, the utility model provides a grounding detection device for the auxiliary circuit of a railway locomotive, which is used to simplify the process of grounding fault detection and improve the ease of detecting loads.

[0006] The present application provides a grounding detection device for the auxiliary circuit of a railway locomotive, including: a plurality of loads, an A / D converter, a judge, and a plurality of current detectors;

[0007] The input end of each current detector is connected to the housing of the corresponding load, and is used to obtain the grounding current leaked from the load housing;

[0008] The input end of the A / D converter is connected to the output end of the current detector, and is used to convert the grounding current from an electrical signal into a digital signal;

[0009] The judge is connected to the output end of the A / D converter, and includes comparators corresponding one-to-one to the A / D converter. Each comparator has a threshold value built in. The comparators compare with the corresponding digital signals. When the input digital signal is not greater than the threshold value, the comparator outputs a first signal. When the input digital signal is greater than the threshold value, the comparator outputs a second signal.

[0010] In the above embodiments, by providing a current detector on the housing of each load, the grounding current condition of each load can be monitored in real time. When an insulation fault occurs in a certain load, a leakage current will be generated on its housing, and the current detector can promptly obtain this abnormal signal; the comparator in the judge can automatically determine whether the digitized grounding current exceeds the threshold. When the grounding current does not exceed the threshold, a first signal is output, indicating that the load is operating normally; when the grounding current exceeds the threshold, a second signal is output, indicating that the load may have an insulation fault. By respectively providing a current detector and a comparator corresponding to each load, independent monitoring of the grounding states of each load in the locomotive auxiliary circuit is achieved. Once a grounding fault occurs in a certain load, the device can quickly locate the specific faulty device, simplifying the grounding fault detection process and improving the ease of load detection.

[0011] In some embodiments, the device further includes: a display screen;

[0012] The judge is further configured to send the first signal and / or the second signal to the display screen;

[0013] The display screen is connected to the output end of the judge and is configured to display a preset first screen when receiving the first signal; and display a preset second screen when receiving the second signal.

[0014] In the above embodiments, by adding a display screen to the device and connecting the output signal of the judge to the display screen, an intuitive display of the grounding fault detection result can be achieved. When the judge outputs the first signal, the display screen displays the preset first screen, indicating that the corresponding load is operating normally; when the judge outputs the second signal, the display screen displays the preset second screen, prompting that the corresponding load may have a grounding fault. This visual display method enables the crew to quickly understand the operating state of the auxiliary circuit and promptly discover potential fault hazards.

[0015] In some embodiments, the current detector is a current transformer.

[0016] In the above embodiments, using a current transformer as the current detector can achieve non-contact measurement of the load grounding current. The current transformer utilizes the principle of electromagnetic induction to sense the current change in the primary winding through the secondary winding, thereby realizing the acquisition and conversion of the current signal. The current transformer does not need to be directly connected to the load circuit, avoiding interference with the normal operation of the load, and at the same time enhancing the electrical isolation and safety of the device.

[0017] In some embodiments, the device further includes a memory;

[0018] The judge is further configured to send the first signal and / or the second signal to the memory;

[0019] A memory for storing the first signal and / or the second signal.

[0020] In the above embodiments, persistent storage and historical traceability of the ground fault detection data can be achieved. By analyzing and mining the stored data, the laws and trends of the load ground fault can be discovered, providing data support for preventive maintenance. At the same time, the stored historical data can also serve as an important basis for accident investigation and liability determination, improving the standardization and traceability of the device operation and maintenance.

[0021] In some embodiments, the device further includes a self-checker corresponding to each current detector;

[0022] The self-checker is connected to the current detector and is used to input a preset current to the current detector.

[0023] In the above embodiments, self-diagnosis and calibration of the current detector can be achieved. The preset current input by the self-checker can simulate the leakage current when the load is grounded. By observing the output response of the current detector, it can be determined whether it is working properly. This self-check mechanism can timely detect the faults or abnormalities of the current detector, improving the self-diagnosis ability and reliability of the device, and reducing the risk of missed detection caused by the failure of the detector.

[0024] In some embodiments, the current detector includes a DIP switch;

[0025] The DIP switch is used to generate an identification signal and send the identification signal to the A / D converter.

[0026] In the above embodiments, by introducing a DIP switch into the current detector, marking and distinguishing of different load ground currents can be achieved. The DIP switch can generate different identification signals corresponding to different loads. When a certain load has a ground fault, its corresponding identification signal will be transmitted to the discriminator together with the fault signal, facilitating the discriminator to quickly identify the faulty load and shortening the fault location time. At the same time, the identification signal can also be stored together with the fault data, providing the necessary load information for subsequent fault analysis and statistics, and improving the integrity and traceability of the fault record.

[0027] In some embodiments, the device further includes a circuit breaker corresponding to each load;

[0028] The discriminator is further used to send the second signal to the circuit breaker;

[0029] The circuit breaker is connected to the output end of the discriminator and is used to cut off the power supply of the corresponding load when receiving the second signal.

[0030] In the above embodiments, when the detector detects that the ground current of a certain load exceeds the threshold, it outputs a second signal to trigger the corresponding circuit breaker to operate, cut off the power supply of the load, prevent secondary damages such as short circuit and overload caused by the ground fault, and ensure the safe operation of the auxiliary circuit of the locomotive.

[0031] In some embodiments, the device further includes an alarm;

[0032] The detector is further configured to send the second signal to the alarm;

[0033] The alarm is connected to the output end of the detector and is configured to give a warning when receiving the second signal.

[0034] In the above embodiments, when the detector detects a ground fault and outputs a second signal, the alarm can be automatically triggered to give a warning to the crew, prompting them to check and handle the faulty load as soon as possible. This real-time fault alarm mechanism can effectively shorten the fault discovery time and handling time.

[0035] In some embodiments, the alarm is a sound alarm.

[0036] In the above embodiments, the sound alarm reminds the crew by emitting a warning sound and is suitable for environments with relatively low noise.

[0037] In some embodiments, the alarm is a vibration alarm.

[0038] In the above embodiments, the vibration alarm reminds the crew by vibration and is suitable for occasions with relatively high noise or where sound interference needs to be avoided.

[0039] The ground detection device for the auxiliary circuit of a railway locomotive provided in the embodiments of the present application has at least the following technical effects or advantages:

[0040] 1. The present utility model provides a ground detection device for the auxiliary circuit of a railway locomotive. By setting a current detector on the housing of each load, the ground current situation of each load can be monitored in real time. When an insulation fault occurs in a certain load, leakage current will be generated on its housing, and the current detector can timely obtain this abnormal signal; the comparator in the detector can automatically judge whether the digitized ground current exceeds the threshold. When the ground current does not exceed the threshold, it outputs a first signal indicating that the load is operating normally; when the ground current exceeds the threshold, it outputs a second signal indicating that the load may have an insulation fault. By respectively setting a current detector and a comparator corresponding to each load, independent monitoring of the ground states of each load in the auxiliary circuit of the locomotive is realized. Once a ground fault occurs in a certain load, the device can quickly locate the specific faulty device, simplify the ground fault detection process, and improve the ease of detecting the load.

[0041] 2. The utility model provides a grounding detection device for the auxiliary circuit of a railway locomotive. By adding a display screen to the device and connecting the output signal of the discriminator to the display screen, the intuitive display of the grounding fault detection result can be realized. When the discriminator outputs the first signal, the display screen shows a preset first screen, indicating that the corresponding load is operating normally; when the discriminator outputs the second signal, the display screen shows a preset second screen, prompting that the corresponding load may have a grounding fault. This visual display method enables the crew to quickly understand the operating state of the auxiliary circuit and timely discover potential fault hazards.

[0042] 3. The utility model provides a grounding detection device for the auxiliary circuit of a railway locomotive. Using an instrument transformer as the current detector, the non-contact measurement of the load grounding current can be realized. The instrument transformer utilizes the principle of electromagnetic induction to sense the current change in the primary winding through the secondary winding, thereby realizing the acquisition and conversion of the current signal. The instrument transformer does not need to be directly connected to the load circuit, avoiding the interference with the normal operation of the load, and at the same time enhancing the electrical isolation and safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic diagram of the grounding detection device for the auxiliary circuit of a railway locomotive provided by the utility model.

[0044] Figure 2 is another schematic diagram of the grounding detection device for the auxiliary circuit of a railway locomotive provided by the utility model.

[0045] Reference numerals: 1. Current detector; 2. A / D converter; 3. Discriminator; 31. Comparator; 4. Load; 5. Display screen; 6. Memory; 7. Alarm; 8. Self-checker. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The terms used in the following embodiments of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. As used in the specification and appended claims of this application, the singular forms "a", "an", "the", "above", "said", "this" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term " / and" used in this application refers to any or all possible combinations including one or more of the listed items.

[0047] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and should not be construed as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality" is two or more than two.

[0048] In order to make the objectives, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0049] The railway locomotive auxiliary circuit grounding detection device in this embodiment will be described below:

[0050] As Figure 1 shown, Figure 1 is a schematic diagram of the railway locomotive auxiliary circuit grounding detection device provided by the present utility model.

[0051] A railway locomotive auxiliary circuit grounding detection device includes: a plurality of loads 4, an A / D converter 2, a discriminator 3, and a plurality of current detectors 1;

[0052] The input end of each current detector 1 is connected to the housing of the corresponding load 4 for obtaining the grounding current leaked from the housing of the load 4.

[0053] It should be noted that for each load 4, its outer shell is connected to the input end of the corresponding current detector 1. In the normal working state, the outer shell of the load 4 should maintain good insulation with the ground, and ideally there is no current. However, when the insulation performance deteriorates or even fails, a leakage current to the ground will occur on the outer shell of the load 4.

[0054] The load 4 mentioned here is a traction fan, a composite fan, a mechanical room fan, an oil pump, etc.

[0055] In a specific embodiment, the current detector 1 is a current transformer.

[0056] The current transformer consists of a primary coil and a secondary coil. The primary coil is directly connected in series with the grounding line of the measured load 4, and the secondary coil is connected to the input end of the A / D converter 2. When the insulation of the load 4 is normal, ideally no current flows through the primary coil, and no induced voltage is output from the secondary coil; while when the load 4 has an insulation fault, the leaked grounding current will flow through the primary coil, and according to the electromagnetic induction law, a voltage signal proportional to the primary current will be induced in the secondary coil.

[0057] The turns ratio parameter of the current transformer (i.e., the ratio of the primary turns to the secondary turns) can be designed according to the range of the actual grounding current, which is not limited herein.

[0058] The primary winding of the transformer can be directly wound around the grounding wire of the load 4 with a relatively thick copper wire, or one end is connected to the shell of the load 4 and the other end is grounded to form a primary circuit. For some loads 4 with a compact structure or where the grounding end is not easily accessible, an opening-type transformer can also be used to measure the current without damaging the original wiring. The secondary winding generally uses a relatively thin wire and is wound on an independent coil skeleton, and the anti-interference ability can be improved through measures such as shielding and isolation.

[0059] It can be seen that using the transformer as the current detector 1 can realize non-contact measurement of the grounding current of the load 4. The transformer utilizes the principle of electromagnetic induction to sense the current change in the primary winding through the secondary winding, thereby realizing the acquisition and conversion of the current signal. The transformer does not need to be directly connected to the load 4 circuit, avoiding interference with the normal operation of the load 4, and at the same time enhancing the electrical isolation and safety of the device.

[0060] It should be noted that obtaining current is already very mature in the related art. The innovation point of the present utility model does not lie in the acquisition of current, and the present utility model does not claim to protect the acquisition of current.

[0061] The input end of the A / D converter 2 is connected to the output end of the current detector 1, and is used to convert the grounding current from an electrical signal into a digital signal;

[0062] The function of the A / D converter 2 is to convert the analog grounding current signal into a digital signal that is convenient for processing and judgment. The input end of the A / D converter 2 is connected to the output ends of the current detectors 1, and through a certain sampling and quantization process, the continuously changing voltage signal can be converted into discrete digital codes.

[0063] It should be noted that converting an electrical signal into a digital signal is already very mature in the related art. The innovation point of the present utility model does not lie in converting an electrical signal into a digital signal, and the present utility model does not claim to protect converting an electrical signal into a digital signal.

[0064] The discriminator 3 is connected to the output end of the A / D converter 2, and includes comparators 31 corresponding one-to-one to the A / D converter 2. Each comparator 31 has a threshold value built-in. The comparators 31 compare with the corresponding digital signals. When the input digital signal is not greater than the threshold value, the comparator 31 outputs a first signal. When the input digital signal is greater than the threshold value, the comparator 31 outputs a second signal.

[0065] The judge 3 internally contains comparators 31 equal in number to the loads 4. Each comparator 31 corresponds to processing one path of grounding current. The comparator 31 compares the current grounding current value with a preset threshold value, and can automatically judge whether the grounding exceeds the standard and output a response result in a timely manner.

[0066] It should be noted that data comparison is already very mature in the related art. The innovation point of the present utility model does not lie in data comparison, and the present utility model does not require data comparison.

[0067] It can be seen that by setting the current detector 1 on the housing of each load 4, the grounding current condition of each load 4 can be monitored in real time. When an insulation fault occurs in a certain load 4, a leakage current will be generated on its housing, and the current detector 1 can obtain this abnormal signal in a timely manner; the comparator 31 in the judge 3 can automatically judge whether the digitized grounding current exceeds the threshold value. When the grounding current does not exceed the threshold value, a first signal is output, indicating that the load 4 is operating normally; when the grounding current exceeds the threshold value, a second signal is output, indicating that the load 4 may have an insulation fault. By respectively setting the current detector 1 and the comparator 31 corresponding to each load 4, independent monitoring of the grounding states of each load 4 in the locomotive auxiliary circuit is realized. Once a grounding fault occurs in a certain load 4, the device can quickly locate the specific faulty device, simplify the grounding fault detection process, and improve the ease of detecting the load 4.

[0068] In actual grounding fault detection, there may be multiple loads 4 to be monitored on a locomotive, such as traction motors, transformers, reactors, etc. They are distributed in different positions, and the magnitudes and change trends of the grounding currents are also different. In order to achieve accurate identification and positioning of these loads 4, in this embodiment, a group of DIP switches is provided inside each current detector 1, which is used to generate a unique identification signal and transmit it to the A / D converter and the judge 3 together with the collected grounding current signal, so as to realize the distinction and management of different loads 4.

[0069] In some embodiments, the current detector 1 includes DIP switches;

[0070] The DIP switch is used to generate an identification signal and send the identification signal to the A / D converter 2.

[0071] The DIP switch is a small manual dial switch. Through different dial combinations, up to dozens of different switch states can be generated. In this embodiment, a unique dial combination can be pre-assigned to each load 4 to characterize its identity characteristics.

[0072] The DIP switch converts its switch state into a digital level signal through a level conversion circuit and sends it together with the analog voltage signal output by the current detector 1 to the A / D converter 2. The A / D converter 2 not only converts the analog voltage into a digital quantity, but also samples and quantizes the encoding signal of the DIP switch to form a composite digital signal. This composite signal usually consists of two parts: the high bit represents the number of the load 4, and the low bit represents the ground current value.

[0073] It can be seen that by introducing a DIP switch into the current detector 1, the marking and differentiation of the ground currents of different loads 4 can be realized. The DIP switch can generate different identification signals corresponding to different loads 4. When a ground fault occurs in a certain load 4, its corresponding identification signal will be transmitted to the discriminator 3 together with the fault signal, which facilitates the discriminator 3 to quickly identify the faulty load 4 and shorten the fault location time. At the same time, the identification signal can also be stored together with the fault data, providing the necessary load 4 information for subsequent fault analysis and statistics, and improving the integrity and traceability of the fault records.

[0074] However, in the actual use process, there is a technical problem that it may not be intuitive enough to characterize the ground state of the load 4 only by the logic level signal output by the discriminator 3.

[0075] As Figure 2 shown, Figure 2 is another schematic diagram of the ground detection device for the auxiliary circuit of a railway locomotive provided by the present utility model. In some embodiments, the device further includes: a display screen 5;

[0076] The discriminator 3 is further configured to send the first signal and / or the second signal to the display screen 5;

[0077] The display screen 5 is connected to the output end of the discriminator 3 and is configured to display a preset first screen when receiving the first signal; and display a preset second screen when receiving the second signal.

[0078] The display screen 5 can be selected from various types such as a liquid crystal display, an electronic paper, an LED dot matrix screen, etc., and the display technology is not limited here, and it is equipped with a corresponding display driving circuit and a controller. In the normal working state, when the discriminator 3 outputs the first signal (corresponding to the output of the comparator 31 being at a low level), a preset first screen will be displayed on the display screen 5, intuitively informing the crew that the current load 4 is operating normally and the ground current value is within the safe range. The specific form of the first screen can be designed according to actual needs, such as using a green indicator light, an image, etc., and at the same time displaying text descriptions such as the name and number of the load 4.

[0079] It can be seen that by adding a display screen 5 to the device and connecting the output signal of the discriminator 3 to the display screen 5, an intuitive display of the grounding fault detection result can be achieved. When the discriminator 3 outputs a first signal, the display screen 5 displays a preset first screen, indicating that the corresponding load 4 is operating normally; when the discriminator 3 outputs a second signal, the display screen 5 displays a preset second screen, prompting that the corresponding load 4 may have a grounding fault. This visual display method enables the crew to quickly understand the operating status of the auxiliary circuit and timely discover potential fault hazards.

[0080] However, in the actual use process, there is a technical problem, that is, the need to trace the historical status of the load 4.

[0081] As Figure 2 shown, in some embodiments, the device further includes a memory 6;

[0082] The discriminator 3 is further configured to send the first signal and / or the second signal to the memory 6;

[0083] The memory 6 is used to store the first signal and / or the second signal.

[0084] It should be noted that the memory 6 not only stores the first signal and / or the second signal, but also stores key information such as the corresponding timestamp and the load 4 number. The timestamp can be generated by the real-time clock circuit built into the grounding detection device, recording the acquisition time of each grounding data.

[0085] The staff can intuitively view the historical grounding current data and alarm records of each load 4 in the form of a table or curve through the upper computer software, and can arbitrarily set parameters such as the start and end time and data resolution. When it is necessary to analyze a certain fault event, just input the approximate time range when the event occurred and the number of the involved load 4, and the software can automatically retrieve the relevant data records, and then make judgments and positioning in combination with professional knowledge, greatly improving the pertinence and timeliness of fault analysis.

[0086] It can be seen that the persistent storage and historical traceability of the grounding fault detection data can be realized. By analyzing and mining the stored data, the laws and trends of the grounding faults of the load 4 can be found, providing data support for preventive maintenance. At the same time, the stored historical data can also be used as an important basis for accident investigation and liability determination, improving the standardization and traceability of the device operation and maintenance.

[0087] However, in the actual use process, there is a technical problem, that is, the current detector 1 itself may also have the risk of failure or malfunction, such as the open circuit of the transformer coil, the malfunction of the Hall element, etc. Once these problems occur, the output signal of the detector will not match the actual grounding current, and then the discriminator 3 will make a wrong alarm decision.

[0088] As Figure 2 shown, in some embodiments, the device further includes a self-checker 8 corresponding to the current detector 1 one by one;

[0089] The self-checker 8 is connected to the current detector 1 and is used to input a preset current to the current detector 1.

[0090] Specifically, the self-checker 8 and the current detector 1 are connected in parallel in the grounding circuit and internally include a controllable current source. This current source can be implemented through a DAC and a V / I conversion circuit, and the magnitude and duration of its output current can be precisely set by the controller. In the normal working state, the self-checker 8 is in the standby state, and its output terminal remains in a high-impedance state, equivalent to an open circuit, without affecting the measurement of the current detector 1. When it is necessary to self-check a certain detector, the controller sends a trigger instruction to the self-checker 8, causing it to output a preset current pulse. The waveform and amplitude of this current can simulate the leakage current when the load 4 has a grounding fault. If the current detector 1 is working properly, it will sense this preset current and output a corresponding voltage signal. Conversely, if the output of the detector does not match the expectation, it means that the detector itself may have a fault and an alarm prompt is required.

[0091] It can be seen that self-diagnosis and calibration of the current detector 1 can be achieved. The preset current input by the self-checker 8 can simulate the leakage current when the load 4 is grounded. By observing the output response of the current detector 1, it can be judged whether it is working properly. This self-check mechanism can timely detect faults or abnormalities of the current detector 1, improve the self-diagnosis ability and reliability of the device, and reduce the risk of missed detection caused by detector failure.

[0092] In the grounding fault detection device, simply relying on the fault signal output by the judge 3 to prompt the crew is far from enough, because this signal is usually only displayed on the monitoring screen and is very likely to be ignored or missed by the staff.

[0093] As Figure 2 shown, in some embodiments, the device further includes a circuit breaker corresponding to the load 4 one by one;

[0094] The judge 3 is further used to send a second signal to the circuit breaker;

[0095] The circuit breaker is connected to the output terminal of the judge 3 and is used to cut off the power supply of the corresponding load 4 when receiving the second signal.

[0096] The circuit breaker corresponds to each load 4 one by one. Its input terminal is connected in the power supply circuit of the load 4, and the output terminal is connected to the judge 3. The model and specifications of the circuit breaker need to be selected according to parameters such as the type and power of the load 4.

[0097] Normally, the circuit breaker is in a normally closed state, enabling the load 4 to operate properly. Once the detector 3 detects that the ground current of the load 4 exceeds the threshold, it outputs a second signal, and the coil of the circuit breaker will be immediately energized, causing the main contacts to open instantaneously, cutting off the power supply of the load 4 and preventing secondary damage caused by continued power supply.

[0098] It can be seen that when the detector 3 detects that the ground current of a certain load 4 exceeds the threshold, it outputs a second signal, triggering the corresponding circuit breaker to operate, cutting off the power supply of the load 4, preventing secondary damage such as short circuit and overload caused by ground faults, and ensuring the safe operation of the locomotive auxiliary circuit.

[0099] Such as Figure 2 shown, in some embodiments, the device further includes an alarm 7;

[0100] The detector 3 is further configured to send the second signal to the alarm 7;

[0101] The alarm 7 is connected to the output end of the detector 3 and is configured to give a warning when receiving the second signal.

[0102] It can be seen that when the detector 3 detects a ground fault and outputs a second signal, the alarm 7 can be automatically triggered to give a warning to the crew, prompting them to check and handle the faulty load 4 as soon as possible. This real-time fault alarm mechanism can effectively shorten the fault discovery time and handling time.

[0103] Such as Figure 2 shown, in some embodiments, the alarm 7 is a sound alarm 7.

[0104] It can be seen that the sound alarm 7 reminds the crew by emitting a warning sound and is suitable for environments with low noise.

[0105] Such as Figure 2 shown, in some embodiments, the alarm 7 is a vibration alarm 7.

[0106] It can be seen that the vibration alarm 7 reminds the crew by vibration and is suitable for occasions with high noise or where sound interference needs to be avoided.

Claims

1. A grounding detection device for the auxiliary circuit of a railway locomotive, comprising a plurality of loads, characterized in that, Including: An A / D converter, a judge, and several current detectors; The input end of each of the current detectors is connected to the housing of the corresponding load, and is used to obtain the grounding current leaked from the load housing; The input end of the A / D converter is connected to the output end of the current detector, and is used to convert the grounding current from an electrical signal into a digital signal; The judge is connected to the output end of the A / D converter, and includes comparators corresponding one-to-one to the A / D converter. Each of the comparators has a threshold value built in. The comparators compare with the corresponding digital signals. When the input digital signal is not greater than the threshold value, the comparator outputs a first signal. When the input digital signal is greater than the threshold value, the comparator outputs a second signal.

2. The ground detection device for the auxiliary circuit of a railway locomotive according to claim 1, characterized in that, The device further includes: a display screen; The judge is further used to send the first signal and / or the second signal to the display screen; The display screen is connected to the output end of the judge, and is used to display a preset first screen when receiving the first signal; and display a preset second screen when receiving the second signal.

3. The ground detection device for the auxiliary circuit of a railway locomotive according to claim 1, wherein The current detector is a current transformer.

4. The grounding detection device for the auxiliary circuit of a railway locomotive according to claim 1, characterized in that, The device further includes a memory; The judge is further used to send the first signal and / or the second signal to the memory; The memory is used to store the first signal and / or the second signal.

5. The ground detection device for the auxiliary circuit of a railway locomotive according to claim 1, characterized in that The device further includes self-checkers corresponding one-to-one to the current detectors; The self-checkers are connected to the current detectors, and are used to input a preset current to the current detectors.

6. The ground detection device for the auxiliary circuit of a railway locomotive according to claim 1, characterized in that The current detector includes a DIP switch; The DIP switch is used to generate an identification signal and send the identification signal to the A / D converter.

7. The grounding detection device for the auxiliary circuit of a railway locomotive according to claim 1, wherein The device further includes circuit breakers corresponding one-to-one to the loads; The judge is further used to send the second signal to the circuit breakers; The circuit breakers are connected to the output end of the judge, and are used to cut off the power supply of the corresponding load when receiving the second signal.

8. The ground detection device for the auxiliary circuit of a railway locomotive according to claim 1, wherein The device further includes an alarm; The judge is further used to send the second signal to the alarm; The alarm is connected to the output end of the judge, and is used to give a warning when receiving the second signal.

9. The ground detection device for the auxiliary circuit of a railway locomotive according to claim 8, characterized in that, The alarm is a sound alarm.

10. An auxiliary circuit grounding detection device for a railway locomotive according to claim 8, characterized in that, The alarm is a vibration alarm.

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