WO2018006515A1 - 直流电传动内燃机车主电路接地保护方法 - Google Patents

直流电传动内燃机车主电路接地保护方法 Download PDF

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WO2018006515A1
WO2018006515A1 PCT/CN2016/104649 CN2016104649W WO2018006515A1 WO 2018006515 A1 WO2018006515 A1 WO 2018006515A1 CN 2016104649 W CN2016104649 W CN 2016104649W WO 2018006515 A1 WO2018006515 A1 WO 2018006515A1
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signal
grounding
ctrl
reset
relay
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PCT/CN2016/104649
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English (en)
French (fr)
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肖桦
宋杨
蔡志伟
高磊
淡永宁
谭志勇
杜欣
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中车大连机车车辆有限公司
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Priority to NZ729108A priority Critical patent/NZ729108A/en
Priority to AU2016304615A priority patent/AU2016304615B2/en
Publication of WO2018006515A1 publication Critical patent/WO2018006515A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/325—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Definitions

  • the invention relates to a grounding protection method for a main circuit of a DC electric drive diesel locomotive, belonging to the technical field of diesel locomotives.
  • the main circuit of the diesel locomotive is characterized by high voltage and high current.
  • the main circuit may be grounded due to cable aging, vibration and friction, and the like. If there is only one point of grounding, it will not cause harm to the normal operation of the main circuit. If there are two or more points grounded, a large short-circuit current will be generated, which will cause the components of the locomotive transmission system to burn out. In severe cases, the machine may even break the accident. Therefore, it is very important to judge and locate the grounding point in a timely, accurate and rapid manner when the main circuit is grounded at one point.
  • a typical main circuit grounding protection device for a DC drive diesel locomotive is mainly composed of a grounding switch, a grounding relay, a rectifying device, etc., and a schematic diagram of the circuit principle is given in FIG.
  • the grounding switch DK has three bits: the operating bit, the negative terminal (fault bit) and the neutral position.
  • the grounding switch DK is set to the running position, and the neutral point N of the main generator GS is grounded through the rectifying device 4ZL and the grounding relay DJ. Since the induced potential of the three-phase winding of the main generator GS is symmetrically distributed, the neutral point N is zero potential, so the neutral point N is an ideal reference point.
  • the ground point has a potential difference with respect to the neutral point N.
  • the grounding relay DJ coil flows current and acts. The normally closed contact of the grounding relay DJ is disconnected, the exciter excitation contactor and the main excitation contactor coil are de-energized, the main generator GS stops generating electricity, the diesel engine is unloaded, and the locomotive stops running.
  • the object of the present invention is to overcome the above deficiencies of the prior art, and to provide a grounding protection method for a main circuit of a DC drive diesel locomotive capable of quickly diagnosing and positioning and properly removing a grounding device.
  • the object of the present invention is achieved by a method for grounding protection of a main circuit of a DC drive diesel locomotive.
  • the neutral point of the main generator AG is grounded through a rectifying device and a grounding relay DJ with a self-reset function, and the DC traction motor M1 Mn Leakage current sensors S1 to Sn are installed between the corresponding contactors BK1 to BKn, where n is the number of DC traction motors of the locomotive, and is characterized by:
  • the signal DJ_IN of the grounding relay DJ and the signals dI 1 to dI n of the leakage current sensors S1 to Sn are sent to the microcomputer controller through the signal detecting interface module, and the microcomputer controller outputs the contactor control signals BK1_Ctrl ⁇ BKn_Ctrl and the excitation loop contactor control signal. LCBK_Ctrl and ground relay reset signal DJ_Ctrl;
  • control steps are:
  • the microcomputer controller When the grounding relay signal DJ_IN is high level and the signals dI 1 to dI n of the leakage sensors S1 to Sn are all less than the given value dI, the microcomputer controller outputs the grounding relay reset signal DJ_Ctrl signal to reset the grounding relay, if reset DJ_IN is low level, the locomotive continues to run under normal working conditions; if the grounding relay continues to operate after reset, the microcomputer controller outputs LCBK_Ctrl signal to control the excitation circuit contactor to be disconnected, and the diesel engine is unloaded;
  • the solution of the invention can realize rapid diagnosis and positioning when the main circuit is grounded, improve the reliability of the locomotive, effectively protect the equipment, and find problems in advance, and remove the grounding equipment according to the situation as appropriate, thereby maximally retaining the traction power of the locomotive and preventing the problem from expanding.
  • FIG. 1 is a schematic diagram of the principle of a grounding protection circuit for a main circuit of a DC drive diesel locomotive in the prior art.
  • FIG. 2 is a schematic circuit diagram of a method for grounding protection of a main circuit of a DC drive diesel locomotive according to an embodiment of the present invention.
  • FIG. 3 is a flow chart of a method for grounding protection of a main circuit of a DC drive diesel locomotive according to an embodiment of the present invention.
  • the neutral point of the main generator AG is grounded through the rectifying device and the grounding relay DJ with self-reset function, and the DC traction motors M1 to M6 and the corresponding contactors BK1 to BK6 Leakage current sensors S1 to S6 are installed between them.
  • the signal DJ_IN of the grounding relay DJ and the signals dI 1 to dI6 of the leakage current sensors S1 to S6 are sent to the microcomputer controller through the signal detecting interface module, and the microcomputer controller outputs the contactor control signals BK1_Ctrl to BK6_Ctrl and the excitation circuit contactor control signal LCBK_Ctrl. And the ground relay reset signal DJ_Ctrl.
  • step 3.2 the microcomputer controller collects the ground relay signal DJ_IN and the 1 to 6# leakage current sensor signals dI 1 , dI 2 , dI 3 , dI 4 , dI 5 , and dI 6 .
  • Entering block 3.3 determines if the signal DJ_IN is high. If the condition in Box 3.3 is not met, return to Box 3.2. If the condition in block 3.3 is satisfied, it proceeds to block 3.4 to determine whether dI 1 , dI 2 , dI 3 , dI 4 , dI 5 , dI 6 are simultaneously less than the set value dI.
  • condition of frame 3.5 go to the 3.12 microcomputer controller output BK1_Ctrl signal to disconnect the contactor of the traction motor M1, and then return to the main program. If the condition of block 3.5 is not satisfied, proceed to block 3.6 to determine if dI 2 is greater than the set value dI. If the condition of block 3.6 is satisfied, go to the 3.10 microcomputer controller output BK2_Ctrl signal to disconnect the contactor of the traction motor M2, and then return to the main program. If the condition in block 3.6 is not satisfied, proceed to block 3.7 to determine if dI 3 is greater than the set value dI.

Abstract

一种直流电传动内燃机车主电路接地保护方法，通过信号检测接口模块将接地继电器DJ的信号DJ_IN和漏电流传感器S1～Sn的信号dI 1～dI n送入微机控制器。当信号DJ_IN为高电平且信号dI 1～dI n全部小于给定值dI，则微机控制器输出接地继电器复位信号DJ_Ctrl信号使接地继电器DJ复位，若复位后DJ_IN为低电平，机车按正常工况继续运行；若复位后接地继电器DJ继续动作，则输出LCBK_Ctrl信号控制励磁回路接触器断开，柴油机卸载；当信号DJ_IN为高电平时，若信号dI i大于dI，则输出BKi_Ctrl信号使接触器BKi断开，同时输出DJ_Ctrl信号使接地继电器DJ复位。可实现接地时的快速诊断和定位，提高机车的可靠性、有效保护设备，并提前发现问题，恰当切除接地设备，且最大限度保留机车牵引动力。

Description

直流电传动内燃机车主电路接地保护方法 技术领域
本发明涉及一种直流电传动内燃机车主电路接地保护方法,属于内燃机车技术领域。
背景技术
内燃机车主电路的特点是高电压、大电流。在运用过程中，主电路可能由于电缆老化、振动摩擦等而发生接地。如果仅有一点接地，对主电路的正常工作不会造成危害。而如果有两点或多点接地，就会产生很大的短路电流，使机车传动系统部件烧损，严重时甚至会导致机破事故。因此，当主电路一点接地时及时、准确、迅速地对接地点进行判断和定位非常重要。
现有技术中，直流电传动内燃机车的一种典型的主电路接地保护装置主要由接地开关、接地继电器、整流装置等组成，附图1给出了其电路原理示意图。接地开关DK共有3个位：运转位、负端位(故障位)与中立位。机车正常运行时，接地开关DK置运转位，主发电机GS的中性点N通过整流装置4ZL和接地继电器DJ接地。由于主发电机GS的三相绕组感应电势呈对称分布，中性点N为零电位，因此中性点N是一个理想参考点。无论主电路中直流侧接地或交流侧接地，其接地点相对中性点N都有电位差。当接地点电位大于某一阀值时，接地继电器DJ线圈流过电流并动作。接地继电器DJ的常闭触头断开，励磁机励磁接触器和主发励磁接触器线圈失电，主发电机GS停止发电，柴油机卸载，机车随之停止运行。
采用上述现有技术的方案，在主电路瞬间接地时，不能提供更多有效信息。司乘人员只能通过转换手柄位、接地开关、手动复位接地继电器等操作排查接地点。判断过程复杂、效率低，不利于对故障迅速判断并采用合理的措施。在极端情况下，误判、误操作会导致励磁机励磁接触器和主发励磁接触器线圈失电，使主发电机停止发电，机车转向架上的牵引电机全部失去电源，牵引力瞬间消失，造成机破。
发明内容
本发明的目的就是克服上述现有技术之不足，提供一种能够快速诊断定位、恰当切除接地设备的直流电传动内燃机车主电路接地保护方法。
本发明的目的是这样实现的：一种直流电传动内燃机车主电路接地保护方法，主发电机AG中性点通过整流装置及带自复位功能的接地继电器DJ接地，直流牵引电机M1～Mn 与对应的接触器BK1～BKn之间安装漏电流传感器S1～Sn，其中n为本机车的直流牵引电机的个数，其特征在于：
通过信号检测接口模块将接地继电器DJ的信号DJ_IN和漏电流传感器S1～Sn的信号dI1～dIn送入微机控制器，微机控制器输出接触器控制信号BK1_Ctrl～BKn_Ctrl、励磁回路接触器控制信号LCBK_Ctrl以及接地继电器复位信号DJ_Ctrl；
其控制步骤为：
A.当接地继电器信号DJ_IN为高电平且漏电传感器S1～Sn的信号dI1～dIn全部小于给定值dI，则微机控制器输出接地继电器复位信号DJ_Ctrl信号使接地继电器复位，若复位后DJ_IN为低电平，机车按正常工况继续运行；若复位后接地继电器继续动作，微机控制器输出LCBK_Ctrl信号控制励磁回路接触器断开，柴油机卸载；
B.当接地继电器信号DJ_IN为高电平时，若dIi大于dI，微机控制器输出BKi_Ctrl信号使接触器BKi断开，同时输出DJ_Ctrl信号使接地继电器复位,其中i为自然数且1≤i≤n。
本发明的方案，可实现主电路接地时的快速诊断和定位，提高机车的可靠性、有效保护设备，并提前发现问题，根据情况酌情切除接地设备，最大限度保留机车牵引动力，防止问题扩大。
附图说明
图1为现有技术的直流电传动内燃机车主电路接地保护电路原理示意图。
图2为本发明实施例的直流电传动内燃机车主电路接地保护方法的电路原理示意图。
图3为本发明实施例的直流电传动内燃机车主电路接地保护方法的程序流程图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
参看图2所示的本实施例的电路原理示意图，主发电机AG中性点通过整流装置及带自复位功能的接地继电器DJ接地，直流牵引电机M1～M6与对应的接触器BK1～BK6之间安装漏电流传感器S1～S6。通过信号检测接口模块将接地继电器DJ的信号DJ_IN和漏电流传感器S1～S6的信号dI1～dI6送入微机控制器，微机控制器输出接触器控制信号BK1_Ctrl～BK6_Ctrl、励磁回路接触器控制信号LCBK_Ctrl以及接地继电器复位信号DJ_Ctrl。
参看图3的程序流程图。进入框3.1开始程序。进入框3.2微机控制器采集接地继电器信 号DJ_IN及1～6#漏电流传感器信号dI1、dI2、dI3、dI4、dI5、dI6。进入框3.3判断信号DJ_IN是否为高电平。若框3.3条件不满足，返回框3.2。若框3.3条件满足，进入框3.4判断dI1、dI2、dI3、dI4、dI5、dI6是否同时小于设定值dI。若框3.4条件满足，进入框3.18微机控制器输出接地继电器复位信号DJ_Ctrl使接地继电器复位。进入框3.19判断信号DJ_IN是否为高电平。若框3.19条件满足，进入框3.20微机控制器输出励磁回路控制信号LCBK_Ctrl，使主发电机停止发电，然后本流程结束。若框3.19条件不满足，返回主程序。若框3.4条件不满足进入框3.5判断dI1是否大于设定值dI。若框3.5条件满足，进入框3.12微机控制器输出BK1_Ctrl信号断开牵引电机M1的接触器，然后返回主程序。若框3.5条件不满足，进入框3.6判断dI2是否大于设定值dI。若框3.6条件满足，进入框3.13微机控制器输出BK2_Ctrl信号断开牵引电机M2的接触器，然后返回主程序。若框3.6条件不满足，进入框3.7判断dI3是否大于设定值dI。若框3.7条件满足，进入框3.14微机控制器输出BK3_Ctrl信号断开牵引电机M3的接触器，然后返回主程序。若框3.7条件不满足，进入框3.8判断dI4是否大于设定值dI。若框3.8条件满足，进入框3.15微机控制器输出BK4_Ctrl信号断开牵引电机M4的接触器，然后返回主程序。若框3.8条件不满足，进入框3.9判断dI5是否大于设定值dI。若框3.9条件满足，进入框3.16微机控制器输出BK5_Ctrl信号断开牵引电机M5的接触器，然后返回主程序。若框3.9条件不满足，进入框3.10判断dI6是否大于设定值dI。若框3.10条件满足，进入框3.17微机控制器输出BK6_Ctrl信号断开牵引电机M6的接触器，然后本流程结束。若框3.10条件不满足，则本流程结束。
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims (1)

  1. 一种直流电传动内燃机车主电路接地保护方法，主发电机AG中性点通过整流装置及带自复位功能的接地继电器DJ接地，直流牵引电机M1～Mn与对应的接触器BK1～BKn之间安装漏电流传感器S1～Sn，其中n为本机车的直流牵引电机的个数，其特征在于：
    通过信号检测接口模块将接地继电器DJ的信号DJ_IN和漏电流传感器S1～Sn的信号dI1～dIn送入微机控制器，微机控制器输出接触器控制信号BK1_Ctrl～BKn_Ctrl、励磁回路接触器控制信号LCBK_Ctrl以及接地继电器复位信号DJ_Ctrl；
    其控制步骤为：
    A.当接地继电器信号DJ_IN为高电平且漏电传感器S1～Sn的信号dI1～dIn全部小于给定值dI，则微机控制器输出接地继电器复位信号DJ_Ctrl信号使接地继电器复位，若复位后DJ_IN为低电平，机车按正常工况继续运行；若复位后接地继电器继续动作，微机控制器输出LCBK_Ctrl信号控制励磁回路接触器断开，柴油机卸载；
    B.当接地继电器信号DJ_IN为高电平时，若dIi大于dI，微机控制器输出BKi_Ctrl信号使接触器BKi断开，同时输出DJ_Ctrl信号使接地继电器复位,其中i为自然数且1≤i≤n。
PCT/CN2016/104649 2016-07-07 2016-11-04 直流电传动内燃机车主电路接地保护方法 WO2018006515A1 (zh)

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NZ729108A NZ729108A (en) 2016-07-07 2016-11-04 Ground protection method for main circuit of dc electric drive diesel locomotive
AU2016304615A AU2016304615B2 (en) 2016-07-07 2016-11-04 Ground protection method for main circuit of DC electric drive diesel locomotive

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CN201610530456.8 2016-07-07
CN201610530456.8A CN106159891B (zh) 2016-07-07 2016-07-07 直流电传动内燃机车主电路接地保护方法

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CN117445757A (zh) * 2023-10-23 2024-01-26 安徽能通新能源科技有限公司 一种基于能量测量技术的锂电池容量管理系统及方法
CN117445757B (zh) * 2023-10-23 2024-05-14 安徽能通新能源科技有限公司 一种基于能量测量技术的锂电池容量管理系统及方法

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