CN114019414A - Locomotive direct current 110V control circuit ground connection detection circuitry - Google Patents
Locomotive direct current 110V control circuit ground connection detection circuitry Download PDFInfo
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- CN114019414A CN114019414A CN202111445678.7A CN202111445678A CN114019414A CN 114019414 A CN114019414 A CN 114019414A CN 202111445678 A CN202111445678 A CN 202111445678A CN 114019414 A CN114019414 A CN 114019414A
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- locomotive
- control circuit
- direct current
- insulation monitor
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- 230000003137 locomotive effect Effects 0.000 title claims abstract description 69
- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 238000009413 insulation Methods 0.000 claims abstract description 51
- 230000001681 protective effect Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
- G01R31/007—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks using microprocessors or computers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Automation & Control Theory (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
A locomotive direct current 110V control circuit grounding detection circuit comprises an insulation monitor, a relay and a power supply for supplying power to the insulation monitor; a detection pin L + of the insulation monitor is connected with the anode of the direct current 110V control circuit, and a detection pin L-of the insulation monitor is connected with the cathode of the direct current 110V control circuit; when the locomotive key is turned into an occupied position, the relay is powered on and is connected with a power supply circuit, the insulation monitor is powered on to work, and when the locomotive is in a reconnection state, the locomotive electric key is not occupied, and the insulation monitor does not work; the first auxiliary contact of the insulation monitor is connected with the positive electrode of the direct current 110V control circuit, and the second auxiliary contact of the insulation monitor is connected with the locomotive control system host TCMS. The problem that when the positive line of the load input end of a related loop of a control system is grounded or the load is grounded and the like, the automatic switch of the control system is tripped in a protective mode, so that the locomotive applies punishment brake faults is solved.
Description
Technical Field
The invention relates to locomotive equipment, in particular to an HXD3D type electric locomotive control power cabinet output DC110V power supply.
Background
During the operation of the HXD3D locomotive, the positive line of a control circuit of the electric locomotive is in equal potential with the locomotive body, so that the instantaneous black screen of a microcomputer display screen (IDU) of an operation end (II-end cab) in the operation process is caused due to the fact that the positive line of a related control loop of a microcomputer system is in short circuit with the negative line (with the locomotive body ground), the pantograph is automatically descended, the main break is in protective disconnection, the punishment of braking and stopping of a train is caused, and in the fault clearing process, the fact that the positive line of a branch circuit of the related loop of the control system is in instantaneous short circuit with a pedal shell (equivalent to the locomotive body) when the unmanned alert foot switch acts is found, the positive line is in short circuit with the pedal shell, the positive line and the negative line are in short circuit, the current is overlarge, and the automatic switch is in protective tripping.
As shown in fig. 1, the detection of the ground fault in the control loop of the HXD3D electric locomotive continues to adopt the negative ground mode in the HXD3 electric locomotive, and the ground detection circuit is formed by connecting a ground detection switch QA59 and two high-resistance resistors R71 and R72 in parallel, and the two ends of the parallel connection are respectively connected to the vehicle body ground point and the negative electrode of the DC110V loop. When the locomotive normally works, the QA59 automatic switch is closed, the two high-resistance resistors R71 and R72 are in short circuit, the loop is directly connected with the grounding point through the switch branch, the ground reference potential is provided for the DC110V power circuit, and the negative electrode of the control circuit and the grounding point of the locomotive body are at the same potential; when the positive pole of the control circuit is in ground fault, the automatic switch QA59 is disconnected, the locomotive control loop is connected with the grounding point of the locomotive body through a high resistance value resistor, and the original switch branch circuit is replaced to provide a ground reference potential to maintain the operation of the locomotive. The ground fault detection mode of the control circuit can only judge the grounding of the positive electrode but cannot judge the grounding fault of the negative electrode, and by researching the setting values of all air automatic switches in the HXD3D electric locomotive control circuit system, most of the setting values of the air switches of the control branch circuits are consistent with the setting value of a grounding detection switch QA59 and are all 10A; when the resistance value of the grounding point is very small, the air switch of the branch circuit of the control circuit and the grounding switch are tripped together. Once a positive ground fault occurs in a control loop of a control system of a locomotive, the power of the whole locomotive control system is lost, and a parking accident is caused.
As shown in fig. 2, when the positive electrode of the load input end of a branch of the control system is grounded, the branch is equivalently communicated with the grounding detection switch branch through the grounding point, the positive electrode of the control branch is in short circuit with the negative electrode, the circuit is in instantaneous overcurrent, and the air switch of the branch and the grounding detection switch are simultaneously disconnected.
As shown in fig. 3, when the positive electrode of a load end of a branch of the control system is grounded, a series circuit is formed between the load end of the branch and the ground detection switch by a ground point, and when the resistance connected to the ground point reaches a certain value and the current of the series circuit reaches the short-circuit current of the ground detection circuit, the ground switch is turned off, and a parallel circuit is formed between the ground resistance and the high ground detection resistance.
Disclosure of Invention
The invention aims to provide a locomotive direct current 110V control circuit grounding detection circuit, which solves the problem that when the positive line of the load input end of a related loop of a control system is grounded or the load is grounded, the automatic switch of the control system is tripped in a protective manner, so that a locomotive applies punishment brake faults.
In order to solve the technical problems, the technical scheme of the invention is as follows: a locomotive direct current 110V control circuit grounding detection circuit comprises a direct current 110V control circuit, wherein the output end of the direct current 110V control circuit is output to locomotive electric equipment through a grounding detection circuit, and the grounding detection circuit comprises an insulation monitor, a relay and a power supply for supplying power to the insulation monitor; a detection pin L + of the insulation monitor is connected with the anode of the direct current 110V control circuit, and a detection pin L-of the insulation monitor is connected with the cathode of the direct current 110V control circuit; when the locomotive key is turned into an occupied position, the relay is powered on and is connected with a power supply circuit, the insulation monitor is powered on to work, and when the locomotive is in a reconnection state, the locomotive electric key is not occupied, and the insulation monitor does not work; the first auxiliary contact of the insulation monitor is connected with the positive electrode of the direct current 110V control circuit, and the second auxiliary contact of the insulation monitor is connected with the locomotive control system host TCMS. The principle of the invention is as follows: the control circuit of the HXD3D locomotive is optimally designed, and an original grounding automatic switch QA59, matched high-resistance resistors R71 and R72 and a grounding connection point of a control system and a locomotive body are removed. The insulation monitoring instrument and the relay are additionally arranged in the control electrical cabinet, the power supply of the insulation monitoring instrument is required to depend on whether a locomotive is occupied, when the locomotive is occupied, the relay is electrified, the insulation monitoring instrument works, when the locomotive is in a reconnection state, a locomotive electric key is not occupied, the insulation monitoring instrument does not work, normally open interlocking contacts 11 and 14 of the insulation monitoring instrument are utilized, an input signal is newly added to a locomotive control system host TCMS, and when a control system circuit is grounded, a fault is prompted in a microcomputer display screen.
As an improvement, the model of the insulation monitor is JDJC-III.
As a modification, the power input pin a1 of the insulation monitor is connected with a power supply through a normally open contact KE1, and the open contact KE1 is associated with a relay; and a power supply input pin A2 of the insulation monitor is connected with the negative electrode of the direct current 110V control circuit.
Compared with the prior art, the invention has the following beneficial effects:
the ground detection circuit of the HXD3D locomotive control circuit is optimally designed to completely avoid the faults which influence the operation of the locomotive, such as power loss of a control system, punishment braking application and the like caused by dead grounding of a line at a positive line input end or load grounding; the circuit design optimization provides a search basis and experience for processing the grounding of the HXD3 series locomotive control circuit in the section, and reduces the searching time of the grounding fault of the HXD3 series locomotive control circuit.
Drawings
Fig. 1 is a diagram of a prior art ground detection circuit.
Fig. 2 is an equivalent circuit diagram of the positive line grounding of the load input terminal of the HXD3D type control circuit.
Fig. 3 is a circuit diagram of the load end line ground or load ground equivalent circuit of the control system.
FIG. 4 is a diagram of a ground detection circuit according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 4, a locomotive direct current 110V control circuit ground detection circuit includes a direct current 110V control circuit, an output end of the direct current 110V control circuit is output to a locomotive electrical device through the ground detection circuit, and the ground detection circuit includes an insulation monitor, a relay and a power supply for supplying power to the insulation monitor; a detection pin L + of the insulation monitor is connected with the anode of the direct current 110V control circuit, and a detection pin L-of the insulation monitor is connected with the cathode of the direct current 110V control circuit; when the locomotive key is turned into an occupied position, the relay is powered on and is connected with a power supply circuit, the insulation monitor is powered on to work, and when the locomotive is in a reconnection state, the locomotive electric key is not occupied, and the insulation monitor does not work; the first auxiliary contact of the insulation monitor is connected with the positive electrode of the direct current 110V control circuit, and the second auxiliary contact of the insulation monitor is connected with a locomotive control system host TCMS; the power input pin A1 of the insulation monitor is connected with a power supply through a normally open contact KE1, and the open contact KE1 is associated with a relay; a power supply input pin A2 of the insulation monitor is connected with the negative electrode of the direct current 110V control circuit; the model of the insulation monitor is JDJC-III type.
The principle of the invention is as follows: the control circuit of the HXD3D locomotive is optimally designed, and an original grounding automatic switch QA59, matched high-resistance resistors R71 and R72 and a grounding connection point of a control system and a locomotive body are removed. The insulation monitoring instrument and the relay are additionally arranged in the control electrical cabinet, the power supply of the insulation monitoring instrument is required to depend on whether a locomotive is occupied, when the locomotive is occupied, the relay is electrified, the insulation monitoring instrument works, when the locomotive is in a reconnection state, a locomotive electric key is not occupied, the insulation monitoring instrument does not work, normally open interlocking contacts 11 and 14 of the insulation monitoring instrument are utilized, an input signal is newly added to a locomotive control system host TCMS, and when a control system circuit is grounded, a fault is prompted in a microcomputer display screen.
The ground detection device for the HXD3D locomotive control circuit is optimally designed to be a novel method for detecting the ground of the control circuit of the electric locomotive, the conditions of plus and minus line grounding of the control circuit of the electric locomotive can be simultaneously detected in real time through the design of the ground detection circuit, when the grounding resistance value is smaller than a certain value, the alarm reminding can be carried out on a microcomputer display screen, the fault finding and closing are convenient, and the safety risk of the locomotive running is greatly reduced.
Claims (3)
1. The utility model provides a locomotive direct current 110V control circuit ground detection circuit, includes direct current 110V control circuit, and direct current 110V control circuit output exports locomotive consumer through ground detection circuit, its characterized in that: the grounding detection circuit comprises an insulation monitor, a relay and a power supply for supplying power to the insulation monitor; a detection pin L + of the insulation monitor is connected with the anode of the direct current 110V control circuit, and a detection pin L-of the insulation monitor is connected with the cathode of the direct current 110V control circuit; when the locomotive key is turned into an occupied position, the relay is powered on and is connected with a power supply circuit, the insulation monitor is powered on to work, and when the locomotive is in a reconnection state, the locomotive electric key is not occupied, and the insulation monitor does not work; the first auxiliary contact of the insulation monitor is connected with the positive electrode of the direct current 110V control circuit, and the second auxiliary contact of the insulation monitor is connected with the locomotive control system host TCMS.
2. The locomotive direct current 110V control circuit ground detection circuit of claim 1, characterized in that: the model of the insulation monitor is JDJC-III type.
3. The locomotive direct current 110V control circuit ground detection circuit of claim 1, characterized in that: the power input pin A1 of the insulation monitor is connected with a power supply through a normally open contact KE1, and the open contact KE1 is associated with a relay; and a power supply input pin A2 of the insulation monitor is connected with the negative electrode of the direct current 110V control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111445678.7A CN114019414B (en) | 2021-11-30 | 2021-11-30 | Locomotive direct current 110V control circuit grounding detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111445678.7A CN114019414B (en) | 2021-11-30 | 2021-11-30 | Locomotive direct current 110V control circuit grounding detection circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN114019414A true CN114019414A (en) | 2022-02-08 |
| CN114019414B CN114019414B (en) | 2024-07-12 |
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| CN202111445678.7A Active CN114019414B (en) | 2021-11-30 | 2021-11-30 | Locomotive direct current 110V control circuit grounding detection circuit |
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Citations (16)
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|---|---|---|---|---|
| GB191325518A (en) * | 1913-11-07 | 1914-11-09 | Frederick Augustu Cortez-Leigh | Improvements in and relating to the Control of Trains, Railroad Vehicles and the like. |
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-
2021
- 2021-11-30 CN CN202111445678.7A patent/CN114019414B/en active Active
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| CN103901316A (en) * | 2014-04-25 | 2014-07-02 | 株洲广丰电气有限公司 | Grounding monitoring device of locomotive air-conditioner system |
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| CN114019414B (en) | 2024-07-12 |
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