CN107817109A - A kind of dry resistance test method of diesel locomotive and device - Google Patents

A kind of dry resistance test method of diesel locomotive and device Download PDF

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Publication number
CN107817109A
CN107817109A CN201711349782.XA CN201711349782A CN107817109A CN 107817109 A CN107817109 A CN 107817109A CN 201711349782 A CN201711349782 A CN 201711349782A CN 107817109 A CN107817109 A CN 107817109A
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CN
China
Prior art keywords
load
resistance
cabinet
locomotive
diesel locomotive
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Withdrawn
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CN201711349782.XA
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Chinese (zh)
Inventor
袁赞江
刘斌
郑纯桥
朱立明
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Electric Science And Technology Ltd Of Car In Zhuzhou
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Electric Science And Technology Ltd Of Car In Zhuzhou
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Priority to CN201711349782.XA priority Critical patent/CN107817109A/en
Publication of CN107817109A publication Critical patent/CN107817109A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00Testing of engines
    • G01M15/04Testing internal-combustion engines
    • G01M15/05Testing internal-combustion engines by combined monitoring of two or more different engine parameters
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00Testing of vehicles
    • G01M17/08Railway vehicles
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34Testing dynamo-electric machines

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)

Abstract

A kind of dry resistance test method of diesel locomotive and device, load is provided for diesel locomotive, TT&C system carries out operational control and gathered data is tested to carry out dry resistance to diesel locomotive by load system, wherein load system is made up of load resistance cabinet, by accessing locomotive rectifier cabinet out-put supply, the test requirements document of locomotive load is met by each branch resistance series and parallel of load resistance cabinet;TT&C system sends control instruction, gathered data information, receiving device working condition according to control requirement.The present invention carries out load test by the way of dry resistance experiment to diesel locomotive, it can realize and multiple status datas are measured, disclosure satisfy that the section of DF4B (2430Kw), DF4D (2900Kw), DF5 (1210Kw), DF7 (1470Kw) and DF8B (3100Kw) diesel locomotive repaiies the locomotive load experimental performance experiment of code.

Description

A kind of dry resistance test method of diesel locomotive and device
Technical field
The present invention relates to a kind of load detection method of diesel locomotive and device, and in particular to a kind of dry resistance examination of diesel locomotive Test method and device.
Background technology
The diesel engine of railway locomotive, it is necessary to carry out locomotive load experiment, is examining the items of diesel engine after maintenance Break-in condition after thermal parameter and mechanical friction, to ensure service behaviour and reliability in diesel engine utilization.Carry out at present Locomotive load experiment in, the mode of load has water resistance and dry two kinds of resistance, is continuously adjusted although water resistance can be realized, meets experiment It is required that but water resistance need to consume a large amount of water, and floor space is big, needs to add electrolyte when doing high current, is usually industry Salt, contain substantial amounts of salinity in caused water vapour in the heating process to water, not only can environmental pollution, and to experiment Equipment corrosion, it can also influence the health of operating personnel.Dry resistance is born using the resistive band on locomotive as the main generator of diesel engine Carry, take up an area less, it is environmentally safe, it is simple to operate, there is promotional value.
Such as application number CN01201682.9, the utility model patent of entitled " shifting dry resistance test vehicle operation table " discloses A kind of shifting dry resistance test vehicle operation table, for dry resistance equipment of the centralized Control as tested locomotive load, including: General supply, power autonomous, control device, protection circuit and field regulator, it is characterised in that control device be provided with supervisory instrument, Indicator lamp, stacked switch and autoalarm, the control output end being made up of combinational circuit and the dry electricity for belonging to external component The controlled terminal connection of equipment is hindered, the input of autoalarm and protection circuit output end connect, and supervisory instrument contains There are the multiple indicating meters being connected respectively with various the electric quantity signal sensors and non-electric charge quantity signalling sensor of tested locomotive; Indicator lamp contains shows excessively stream, differential, ground fault instruction respectively, and alternating current and direct current power supply instruction, testing stand working condition refers to Show, the on off operating mode of each contactor indicates many indicator lamps.Although this patent proposes a kind of dry resistance test vehicle, but for specific How the regulation of resistance value is carried out to meet that the needs of different automobile types experiment do not relate to.
And for example document " design [D] the Southwest Jiaotong Universitys of the yellow brave new dry ash yard of Xiang diesel locomotives, 2002. " refer to a kind of dry ash yard, are grouped by energy dissipating portion, detection sensor part, computer system management processing unit Into transforming locomotive dry ash yard using IGBT, and utilize technique of computer measurement and control, PWM technologies and weighted resistor technology(Digital skill Art)Dry ash yard is controlled.But the method and structure are more complicated, therefore still need to improve.
The content of the invention
The present invention is for problem present in the detection of Current internal combustion engines car dry ash yard, it is proposed that a kind of diesel locomotive is done Hinder test method and device, load test easily carried out to the diesel locomotive after maintenance, disclosure satisfy that DF4B (2430Kw), The locomotive that DF4D (2900Kw), DF5 (1210Kw), the section of DF7 (1470Kw) and DF8B (3100Kw) diesel locomotive repair code is born Carry experimental performance experiment.
The present invention is that technological means is used by solving the above problems:A kind of dry resistance test method of diesel locomotive, passes through Load system provides load, TT&C system progress operational control and gathered data to carry out dry resistance to diesel locomotive for diesel locomotive Experiment, wherein load system is made up of load resistance cabinet, each by load resistance cabinet by accessing locomotive rectifier cabinet out-put supply Branch resistance series and parallel meets the test requirements document of locomotive load;TT&C system sends control instruction according to control requirement, gathers number It is believed that breath, receiving device working condition.
Further, load resistance cabinet is equipped with more than two, and every load resistance cabinet is using subdivision resistance branch side Method, reduce the power that each branch resistance band undertakes.
Further, by the way of forced air cooling radiating, every load resistance cabinet enters load resistance cabinet equipped with blower fan Row radiating, TT&C system is measured and shown to each transportation work style temperature, and blower fan start and stop are controlled.
Further, in a load resistance cabinet wherein resistance is used to finely tune master equipped with single-phase chopper all the way all the way The electric current in loop.
Further, TT&C system uses centralized configuration, and industrial computer is provided with as man-machine in the console of TT&C system Interface operated, order and reception state data sent provided with main control PLC, provided with display device to operational order and status number According to being shown, the status data of diesel locomotive is acquired by analogue collection module.
Further, TT&C system is additionally included in a load cabinet provided with electricity of the IGBT controllers for finely tuning major loop Stream.
A kind of dry resistance experimental rig of diesel locomotive, including load system and TT&C system, load system is by load resistance cabinet Composition, the input of load resistance cabinet are connected with locomotive rectifier cabinet out-put supply, and the output end of load resistance cabinet is as internal combustion engine The load of the dry resistance experiment of car;TT&C system includes console, industrial computer, main control PLC, display device and analogue collection module, Industrial computer and main control PLC are each provided at console, and display device and analogue collection module electrically connect with console.
Further, load resistance cabinet has more than two, and every load resistance cabinet includes more than two resistive bands, every Electrically connected by switching between resistive band in load resistance cabinet, electrically connected between four load resistance cabinets by switching.
Further, the resistance all the way in a load resistance cabinet is furnished with the single-phase of electric current for being used to finely tune major loop and cut Ripple device.
Further, each load resistance cabinet is equipped with carrying out load resistance cabinet the blower fan of forced air cooling radiating, Electrically connected between blower fan and TT&C system.
Further, TT&C system, which also includes being arranged on, is used for the electric current for finely tuning major loop in a load resistance cabinet IGBT controllers.
Further, TT&C system also includes remote terminal.
The beneficial effects of the invention are as follows:
1. the present invention carries out load test by the way of dry resistance experiment to diesel locomotive, it can realize and electricity is exported to rectifier cabinet Pressure, rectifier cabinet output current, main generator excitation voltage, main generator excitation electric current, exciting current of exciter, tachometer generator Exciting current, machine oil terminal pressure, afterwards preceding increasing engine oil pressure, increasing engine oil pressure, total pressure at expulsion, preceding increasing delivery temperature, rear increasing Delivery temperature, cooling water temperature, oil temperature etc. measure;Equipment working state can be monitored, and with protection Function.
2. the load system of the present invention is made up of multiple load resistance cabinets, each load resistance cabinet is using subdivision resistance branch Path method, the power that each branch resistance band undertakes is reduced, meet that locomotive is born by each branch resistance series and parallel of load resistance cabinet The test requirements document of load, it disclosure satisfy that DF4B (2430Kw), DF4D (2900Kw), DF5 (1210Kw), DF7 (1470Kw) and DF8B The section of (3100Kw) diesel locomotive repaiies the locomotive load experimental performance experiment of code.
3. the present invention is used to finely tune major loop by being equipped with chopper and IGBT controllers in a load resistance cabinet Electric current, realize more accurate current regulation.
Brief description of the drawings
Fig. 1 is principle of the invention block diagram;
Fig. 2 is the load resistance cabinet schematic diagram of the embodiment of the present invention one;
Fig. 3 is that the load resistance of the embodiment of the present invention one finely tunes schematic diagram;
Fig. 4 is the TT&C system structural representation of the embodiment of the present invention one.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
Embodiment one
As shown in figure 1, a kind of dry resistance experimental rig of diesel locomotive, including load system and TT&C system, load system is by loading Resistor box is formed, and the input of load resistance cabinet is connected with locomotive rectifier cabinet out-put supply, the output end conduct of load resistance cabinet The load of the dry resistance experiment of diesel locomotive;TT&C system includes console, industrial computer, main control PLC, display device and analog acquisition Module, industrial computer and main control PLC are each provided at console, and display device and analogue collection module electrically connect with console.
As shown in figure 4, TT&C system uses centralized configuration, a console is set as total operating platform, mainly By industrial computer, PLC-S7200, analogue collection module, IGBT controllers, remote terminal operator control panel composition.Wherein industrial computer is made For the host computer of TT&C system, there is provided man-machine interface;Main control PLC is that equipment control command sends source and equipment state receives source; Analogue collection module performs status information of equipment collection and parameter feedback, is passed by temperature sensor, voltage sensor, electric current Sensor etc. gathers each status information.There are audible and visible alarm device and emergency stop button on console, but experimental rig appearance is different Alarm often or when failing is provided, and main power source can be cut off rapidly by pressing emergency stop button.
Load resistance cabinet has four:Load resistance cabinet 1, load resistance cabinet 2, load resistance cabinet 3, load resistance cabinet 4, every Load resistance cabinet includes more than two resistive bands, is electrically connected between the resistive band in every load resistance cabinet by switching, four Electrically connected between platform load resistance cabinet by switching.
As shown in Fig. 2 setting 11 road resistance in every load resistance cabinet, formed per road resistance using two sections of resistant series Centre tap outlet method, one section of 2.3 Ω of resistance/246A, two sections of 1.6 Ω of resistance/246A, maximum amount electric current are 250A.Often The load of platform load resistance cabinet reduces the power undertaken of each branch resistance band, every electricity using resistance branch method is segmented The maximum current for hindering branch road is 250A, and the connection in series-parallel between resistance is realized by switch, and flexible modulation reaches the resistance value of needs, Power gear can be made more to segment, meet the requirement of different locomotive tests.
Each load resistance cabinet is equipped with carrying out load resistance cabinet the 5KW of forced air cooling radiating axial flow blower, Electrically connected between blower fan and TT&C system, start and stop of the industrial computer to blower fan are controlled, and analogue collection module is to each transportation work style temperature Measure and show, console can carry out alarm when the blower fan abnormal signal collected.
Resistance all the way in load resistance cabinet 4 is furnished with the single-phase chopper for the electric current for being used to finely tune major loop.Such as Fig. 3 institutes Show, single-phase chopper is configured in load resistance cabinet and is used to finely tune load resistance, main circuit current is realized by the fine setting of resistance Fine setting.IGBT controllers are additionally provided with this load resistance cabinet, the fine setting of main circuit current is realized using IGBT controllers.It is single The fine setting branch road that phase chopper and IGBT controllers are formed in load resistance cabinet 4.
Adopted between industrial computer and main control PLC, between main control PLC and remote terminal, between industrial computer and IGBT controllers Communicated with RS485 buses and data transfer.Industrial computer is also connected with a display screen, is communicated using RS422 buses And data transfer.
Above-described embodiment further relates to a kind of dry resistance test method of diesel locomotive, is provided and born for diesel locomotive by load system Load, TT&C system carry out operational control and gathered data is tested to carry out dry resistance to diesel locomotive, and wherein load system is by loading Resistor box forms, and by accessing locomotive rectifier cabinet out-put supply, meets locomotive by each branch resistance series and parallel of load resistance cabinet The test requirements document of load;TT&C system sends control instruction, gathered data information, receiving device work shape according to control requirement State.
Equipped with more than two, every load resistance cabinet using subdivision resistance branch method, is reduced every load resistance cabinet The power that individual branch resistance band undertakes, the maximum current of every resistance branch is 250A.
By the way of forced air cooling radiating, every load resistance cabinet is radiated load resistance cabinet equipped with blower fan, is surveyed Control system is measured and shown to each transportation work style temperature, and blower fan start and stop are controlled.
In a load resistance cabinet wherein resistance is used for the electricity for finely tuning major loop equipped with single-phase chopper all the way all the way Stream.
TT&C system uses centralized configuration, is grasped in the console of TT&C system provided with industrial computer as man-machine interface Make, send order and reception state data provided with main control PLC, operational order and status data are shown provided with display device Show, the status data of diesel locomotive is acquired by analogue collection module.
TT&C system is additionally included in a load cabinet to be adjusted provided with electric current of the IGBT controllers for finely tuning major loop, maximum Current 250A.
When carrying out the dry resistance experiment of diesel locomotive, operating personnel send equipment control command in console, by industrial computer Communicated by RS485 and deliver to order in main control PLC, then corresponding control command is performed by subordinate's element by main control PLC.Subordinate Executive component only receives the order that main control PLC is sent, and corresponding equipment is controlled after explanation.Can be according to test technology requirement pair Testing stand load system is controlled, and testing stand auxiliary equipment is controlled;Can be according to different subjects(DF4B、 DF4D、DF5、DF7、DF8B)Carry out experiment selection.Status signal (digital-to-analog) in I/O collection screen cabinets delivers to main control PLC, Industrial computer is delivered to by RS485 communications by main control PLC, industrial computer will include in man-machine interface after signal transacting(Such as voltage, electricity Stream information and warning message etc.).Analogue collection module gathers the status signal (current/voltage) of locomotive, delivers to main control PLC, Industrial computer is delivered to by RS485 communications by main control PLC, industrial computer will include in man-machine interface after signal transacting;Remote terminal Operating personnel observe each status information of locomotive (temperature/pressure) write operation screen by operator control panel and deliver to master control through RS485 communications PLC, industrial computer is delivered to by RS485 communications by main control PLC, industrial computer will include in man-machine interface after signal transacting(If any Alarm produces, will display alarm information on the display apparatus).
Specifically such as confirm locomotive rectifier cabinet out-put supply, conjunction R1-R4 tetra- when to the dry resistance experiment of DF4B progress locomotive loads Each 11 branch resistances of individual load resistance cabinet and when observing man-machine interface current and reaching the requirement of DF4B load tests, stop closing each Branch resistance, analogue collection module is acquired to the status data of each 11 branch roads of each load resistance cabinet, it is determined that often Individual load resistance cabinet is in the operating temperature of permission.
When to the dry resistance experiment of DF4D progress locomotive loads, locomotive rectifier cabinet out-put supply, tetra- loads of conjunction R1-R4 are confirmed Each seven branch resistances of resistor box and when observing man-machine interface current and reaching the requirement of DF4B load tests, stop closing each branch road electricity Resistance, analogue collection module are acquired to the status data of each seven branch roads of each load resistance cabinet, it is determined that each load electricity Cabinet is hindered in the operating temperature of permission.
When to the dry resistance experiment of DF8B progress locomotive loads, locomotive rectifier cabinet out-put supply, tri- loads of conjunction R1-R3 are confirmed Each ten branch resistances of resistor box and when observing man-machine interface current and reaching the requirement of DF4B load tests, stop closing each branch road electricity Resistance, analogue collection module are acquired to the status data of each ten branch roads of three load resistance cabinets, it is determined that each load electricity Cabinet is hindered in the operating temperature of permission.
When to the dry resistance experiment of DF7, DF5 progress locomotive load, locomotive rectifier cabinet out-put supply, conjunction R1-R4 tetra- are confirmed Each 11 branch resistances of load resistance cabinet and observe man-machine interface current reach DF4B load tests requirement when, stop close each Road resistance, analogue collection module is acquired to the status data of each 11 branch roads of each load resistance cabinet, it is determined that each Load resistance cabinet is in the operating temperature of permission.
Above example is used for illustrative purposes only, rather than limitation of the present invention, the technology people about technical field Member without departing from the spirit and scope of the present invention, can also make a variety of changes or convert, therefore all equivalent Technical scheme should also belong to protection scope of the present invention, and protection scope of the present invention should be limited by each claim.

Claims (10)

  1. A kind of 1. dry resistance test method of diesel locomotive, it is characterised in that:By load system load, observing and controlling are provided for diesel locomotive System carries out operational control and gathered data is tested to carry out dry resistance to diesel locomotive, and wherein load system is by load resistance cabinet group Into by accessing locomotive rectifier cabinet out-put supply, the examination of locomotive load is met by each branch resistance series and parallel of load resistance cabinet Test requirement;TT&C system sends control instruction, gathered data information, receiving device working condition according to control requirement.
  2. 2. the dry resistance test method of diesel locomotive as claimed in claim 1, it is characterised in that:Load resistance cabinet equipped with two with On, every load resistance cabinet using subdivision resistance branch method, reduces the power that each branch resistance band undertakes.
  3. 3. the dry resistance test method of diesel locomotive as claimed in claim 2, it is characterised in that:Load resistance cabinet uses forced air cooling The mode of radiating, every load resistance cabinet are radiated equipped with blower fan, and TT&C system is measured and shown to each transportation work style temperature, Blower fan start and stop are controlled.
  4. 4. the dry resistance test method of diesel locomotive as claimed in claim 2, it is characterised in that:Its in a load resistance cabinet In all the way resistance be used for the electric current for finely tuning major loop equipped with single-phase chopper all the way.
  5. 5. the dry resistance test method of diesel locomotive as claimed in claim 1, it is characterised in that:TT&C system is tied using centralization Structure, operated provided with industrial computer as man-machine interface in the console of TT&C system, send order and reception provided with main control PLC Status data, provided with display device operational order and status data are shown, by analogue collection module to internal combustion engine The status data of car is acquired.
  6. 6. the dry resistance test method of diesel locomotive as claimed in claim 5, it is characterised in that:TT&C system is additionally included in one and born Carry in cabinet provided with electric current of the IGBT controllers for finely tuning major loop.
  7. 7. a kind of dry resistance experimental rig of diesel locomotive, including load system and TT&C system, it is characterised in that:Load system is by bearing Resistor box composition is carried, the input of load resistance cabinet is connected with locomotive rectifier cabinet out-put supply, and the output end of load resistance cabinet is made For the load of the dry resistance experiment of diesel locomotive;TT&C system is adopted including console, industrial computer, main control PLC, display device and analog quantity Collect module, industrial computer and main control PLC are each provided at console, and display device and analogue collection module electrically connect with console.
  8. 8. the dry resistance experimental rig of diesel locomotive as claimed in claim 7, it is characterised in that:Load resistance cabinet has more than two, Every load resistance cabinet includes more than two resistive bands, is electrically connected between the resistive band in every load resistance cabinet by switch Connect, electrically connected between four load resistance cabinets by switching.
  9. 9. the dry resistance experimental rig of diesel locomotive as claimed in claim 8, it is characterised in that:Each load resistance cabinet is equipped with There is the blower fan that forced air cooling radiating is carried out to load resistance cabinet, electrically connected between blower fan and TT&C system.
  10. 10. the dry resistance experimental rig of diesel locomotive as claimed in claim 8, it is characterised in that:In a load resistance cabinet Resistance is furnished with the single-phase chopper for the electric current for being used to finely tune major loop all the way;
    TT&C system, which also includes being arranged on, is used for the IGBT controllers for finely tuning the electric current of major loop in a load resistance cabinet.
CN201711349782.XA 2017-12-15 2017-12-15 A kind of dry resistance test method of diesel locomotive and device Withdrawn CN107817109A (en)

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Application Number Priority Date Filing Date Title
CN201711349782.XA CN107817109A (en) 2017-12-15 2017-12-15 A kind of dry resistance test method of diesel locomotive and device

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1296169A (en) * 2000-12-26 2001-05-23 北京铁路分局丰台机务段 Mobile dry resistance test vehicle equipment
CN1361415A (en) * 2000-12-28 2002-07-31 北京铁路分局丰台机务段 Test device of movable dry friction damping test trolley
CN201429507Y (en) * 2009-01-09 2010-03-24 丁艳巍 Locomotive power-supply load test detection device
CN102230955A (en) * 2011-06-24 2011-11-02 株洲南车时代电气股份有限公司 Dynamic ageing monitoring system and method for switch mode power supply of locomotive
CN103149471A (en) * 2013-01-31 2013-06-12 云南电力试验研究院(集团)有限公司电力研究院 Calibration method and calibration device for battery charger and charging pile
US8723573B1 (en) * 2012-06-20 2014-05-13 Integrated Device Technology, Inc. Method and apparatus for reducing crowbar current and controlling slew rate
CN203960333U (en) * 2014-04-10 2014-11-26 青岛双瑞海洋环境工程股份有限公司 multiple branch circuit load device
CN105137253A (en) * 2015-10-15 2015-12-09 大连交通大学 Airport navigation aid light regulator experiment table
CN205787034U (en) * 2016-07-07 2016-12-07 龙岩市海德馨汽车有限公司 Supply vehicle load testing device
EP3101748A1 (en) * 2015-06-05 2016-12-07 General Electric Company Direct current power distribution and protection system
CN207540793U (en) * 2017-12-15 2018-06-26 株洲中车电气科技有限公司 A kind of diesel locomotive does resistance experimental rig

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1296169A (en) * 2000-12-26 2001-05-23 北京铁路分局丰台机务段 Mobile dry resistance test vehicle equipment
CN1361415A (en) * 2000-12-28 2002-07-31 北京铁路分局丰台机务段 Test device of movable dry friction damping test trolley
CN201429507Y (en) * 2009-01-09 2010-03-24 丁艳巍 Locomotive power-supply load test detection device
CN102230955A (en) * 2011-06-24 2011-11-02 株洲南车时代电气股份有限公司 Dynamic ageing monitoring system and method for switch mode power supply of locomotive
US8723573B1 (en) * 2012-06-20 2014-05-13 Integrated Device Technology, Inc. Method and apparatus for reducing crowbar current and controlling slew rate
CN103149471A (en) * 2013-01-31 2013-06-12 云南电力试验研究院(集团)有限公司电力研究院 Calibration method and calibration device for battery charger and charging pile
CN203960333U (en) * 2014-04-10 2014-11-26 青岛双瑞海洋环境工程股份有限公司 multiple branch circuit load device
EP3101748A1 (en) * 2015-06-05 2016-12-07 General Electric Company Direct current power distribution and protection system
CN105137253A (en) * 2015-10-15 2015-12-09 大连交通大学 Airport navigation aid light regulator experiment table
CN205787034U (en) * 2016-07-07 2016-12-07 龙岩市海德馨汽车有限公司 Supply vehicle load testing device
CN207540793U (en) * 2017-12-15 2018-06-26 株洲中车电气科技有限公司 A kind of diesel locomotive does resistance experimental rig

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Application publication date: 20180320