CN219873231U - Grounding device suitable for special reflux of urban rail transit - Google Patents

Grounding device suitable for special reflux of urban rail transit Download PDF

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Publication number
CN219873231U
CN219873231U CN202321127148.2U CN202321127148U CN219873231U CN 219873231 U CN219873231 U CN 219873231U CN 202321127148 U CN202321127148 U CN 202321127148U CN 219873231 U CN219873231 U CN 219873231U
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direct current
isolating switch
current contactor
grounding
electric isolating
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王小峰
饶晓明
魏昕
张国龙
龚晓冬
沈蓉
沈敏敏
陈怡心
曾帅
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Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
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Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
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Abstract

The utility model relates to the technical field of rail transit traction power supply, in particular to a special reflux grounding device suitable for urban rail transit, which comprises a compound switch composed of a direct current contactor and an electric isolating switch, wherein the direct current contactor is connected with a negative electrode reflux rail and a grounding busbar to realize quick grounding, the electric isolating switch is connected in parallel at two ends of the direct current contactor and is positioned in a loop formed by the direct current contactor, the negative electrode reflux rail and the grounding busbar, and the switching-on and switching-off state of the electric isolating switch and the switching-on and switching-off state of the direct current contactor are mutually follow-up. The utility model has the advantages that: the personal safety of operation and maintenance personnel during overhaul work is ensured, and the safety is high; simple and reasonable structure, good economy, convenient practical application and suitability for popularization.

Description

一种适用于城市轨道交通专用回流的接地装置A grounding device suitable for special return flow in urban rail transit

技术领域Technical field

本实用新型涉及轨道交通牵引供电技术领域,尤其是一种适用于城市轨道交通专用回流的接地装置,特别是一种用于城市轨道交通直流牵引供电系统的接地装置。The utility model relates to the technical field of rail transit traction power supply, in particular to a grounding device suitable for special return flow of urban rail transit, in particular to a grounding device used in a DC traction power supply system of urban rail transit.

背景技术Background technique

城市轨道交通牵引供电的直流系统的正、负极均采用绝缘安装,由于运行和短路电流,在负回流回路和结构地之间将产生不允许的接触电压,根据IEC62128-1/EN 50122-1标准,需要限制负极对地的电压以防止对于人身安全造成伤害。目前,如何设计一种装置来方便实现负回流回路的接地以保证人身安全是亟待解决的技术问题。The positive and negative poles of the DC system for urban rail transit traction power supply are installed with insulation. Due to operation and short-circuit current, impermissible contact voltage will be generated between the negative return circuit and the structural ground. According to the IEC62128-1/EN 50122-1 standard , it is necessary to limit the voltage between the negative pole and the ground to prevent damage to personal safety. At present, how to design a device to facilitate the grounding of the negative return loop to ensure personal safety is an urgent technical problem that needs to be solved.

发明内容Contents of the invention

本实用新型的目的是根据上述现有技术的不足,提供了一种适用于城市轨道交通专用回流的接地装置,当负极专用轨回流需要接地时实现快速接地,同时为可能的故障电流提供通路,可实现负极对地可靠接地,将接触电压钳制与大地绝对零电位,确保运维人员检修工作时的人身安全。The purpose of this utility model is to provide a grounding device suitable for the special return flow of urban rail transit based on the above-mentioned shortcomings of the existing technology. When the return flow of the negative electrode special rail needs to be grounded, it can achieve rapid grounding and at the same time provide a path for possible fault currents. It can achieve reliable grounding of the negative pole to the ground, clamp the contact voltage to absolute zero potential of the earth, and ensure the personal safety of operation and maintenance personnel during maintenance work.

本实用新型目的实现由以下技术方案完成:The purpose of this utility model is achieved by the following technical solutions:

一种适用于城市轨道交通专用回流的接地装置,其特征在于:该装置包括由直流接触器和电动隔离开关组成的复合开关,其中所述直流接触器与负极回流轨以及接地母排连接实现快速接地,所述电动隔离开关并联在所述直流接触器的两端并位于其与所述负极回流轨和所述接地母排构成的回路内,所述电动隔离开关的分合状态与所述直流接触器的分合状态互为随动。A grounding device suitable for special return flow of urban rail transit, characterized in that: the device includes a composite switch composed of a DC contactor and an electric isolating switch, wherein the DC contactor is connected to the negative return rail and the grounding busbar to achieve rapid Grounding, the electric isolating switch is connected in parallel at both ends of the DC contactor and is located in the loop formed by it, the negative return rail and the grounding busbar. The opening and closing state of the electric isolating switch is related to the DC contactor. The opening and closing states of the contactors follow each other.

所述电动隔离开关的分合状态与所述直流接触器的分合状态互为随动指的是:当接地时,所述直流接触器合上将所述负极回流轨的回路短路时,所述电动隔离开关随动合上;当非接地时,所述电动隔离开关分开,所述直流接触器随动分开。The opening and closing state of the electric isolating switch and the opening and closing state of the DC contactor follow each other, which means that when the DC contactor is closed and the circuit of the negative return rail is short-circuited when grounded, the The electric isolating switch is closed as a result; when it is not grounded, the electric isolating switch is disconnected, and the DC contactor is disconnected as a result.

所述直流接触器和所述电动隔离开关的分合状态由PLC控制器控制。The opening and closing states of the DC contactor and the electric isolation switch are controlled by a PLC controller.

本实用新型的优点是:确保运维人员检修工作时的人身安全,安全性高;结构简单合理,经济性好,便于实际应用,适于推广。The advantages of this utility model are: it ensures the personal safety of operation and maintenance personnel during maintenance work and is highly safe; it has a simple and reasonable structure, is economical, is convenient for practical application, and is suitable for promotion.

附图说明Description of the drawings

图1为本实用新型的主回路及二次回路电源接线示意图;Figure 1 is a schematic diagram of the main circuit and secondary circuit power supply wiring of the present utility model;

图2为本实用新型的控制回路原理图;Figure 2 is a schematic diagram of the control loop of the present utility model;

图3为本实用新型的信号回路原理图;Figure 3 is a schematic diagram of the signal loop of the present utility model;

图4为本实用新型的PLC控制原理图。Figure 4 is a PLC control principle diagram of the present utility model.

实施方式Implementation

以下结合附图通过实施例对本实用新型特征及其它相关特征作进一步详细说明,以便于同行业技术人员的理解:The features of the present utility model and other related features will be further described in detail through examples in conjunction with the accompanying drawings to facilitate the understanding of those skilled in the industry:

如图1-4所示,图中标记1-4分别表示为:负极回流轨1、接地母排2、直流接触器3、电动隔离开关4。As shown in Figure 1-4, marks 1-4 in the figure are respectively: negative return rail 1, grounding busbar 2, DC contactor 3, and electric isolation switch 4.

实施例:如图1至图4所示,本实施例中适用于城市轨道交通专用回流的接地装置用于实现负极回流轨1需要接地时的可靠接地,同时为可能的故障电流提供通路。Embodiment: As shown in Figures 1 to 4, in this embodiment, the grounding device suitable for urban rail transit special return is used to achieve reliable grounding when the negative return rail 1 needs to be grounded, and at the same time provide a path for possible fault currents.

如图1所示,本实施例中的接地装置包括由直流接触器3和电动隔离开关4组合的复合开关。其中,直流接触器3连接于负极回流轨1与接地母排2之间。当运维人员在停电区间内需要进行检修作业时,通过合上直流接触器3将直流供电系统负极与接地系统短接,通过本实施例中的接地装置实现快速接地。电动隔离开关4则并联在直流接触器3的两端并位于其与负极回流轨1和接地母排2构成的回路内,且电动隔离开关3的分合状态与直流接触器3的分合状态互为随动。As shown in Figure 1, the grounding device in this embodiment includes a composite switch composed of a DC contactor 3 and an electric isolation switch 4. Among them, the DC contactor 3 is connected between the negative return rail 1 and the ground busbar 2 . When the operation and maintenance personnel need to perform maintenance work in the power outage interval, the negative pole of the DC power supply system and the grounding system are short-circuited by closing the DC contactor 3, and rapid grounding is achieved through the grounding device in this embodiment. The electric isolating switch 4 is connected in parallel at both ends of the DC contactor 3 and is located in the loop formed by it, the negative return rail 1 and the ground busbar 2, and the opening and closing state of the electric isolating switch 3 is consistent with the opening and closing state of the DC contactor 3 Follow each other.

具体而言,当接地时,接地装置首先合上直流接触器3将负极回流轨1回路短路可靠接地,以减小可能产生的过高的电压;此时,电动隔离开关4随动合上,一方面保证足够的短路容量,另一方面确保控制电源失电导致直流接触器3分开造成无效接地而威胁到人身安全。Specifically, when grounding, the grounding device first closes the DC contactor 3 to short-circuit the negative return rail 1 to the ground reliably to reduce the excessive voltage that may be generated; at this time, the electric isolation switch 4 follows and closes, On the one hand, it ensures sufficient short-circuit capacity; on the other hand, it ensures that the control power supply loses power and causes the DC contactor 3 to separate, causing invalid grounding and threatening personal safety.

当非接地时,接地装置首先分开电动隔离开关4,直流接触器3随动以确保电动隔离开关4无载操作,待电动隔离开关4分断到位后将直流接触器3打开,完成断开操作,系统恢复到负极回流轨1的绝缘状态。When not grounded, the grounding device first separates the electric isolating switch 4, and the DC contactor 3 follows to ensure the no-load operation of the electric isolating switch 4. After the electric isolating switch 4 is disconnected in place, the DC contactor 3 is opened to complete the disconnection operation. The system returns to the insulated state of negative return rail 1.

本实施例在具体实施时:直流接触器3与电动隔离开关4可由PLC控制器控制。During specific implementation of this embodiment: the DC contactor 3 and the electric isolation switch 4 can be controlled by a PLC controller.

电动隔离开关4的分/合状态、直流接触器3的分/合状态、PLC控制器的工作状态、电源状态等信号回路如图3所示,实现对主要元器件工作状态的监视。The signal loops such as the opening/closing status of the electric isolation switch 4, the opening/closing status of the DC contactor 3, the working status of the PLC controller, and the power supply status are shown in Figure 3 to monitor the working status of the main components.

PLC控制器的控制回路可按如图4所示的方式设计,实现遥控功能及数据后台上传,进一步提高接地装置的使用效果,尤其是保证其使用安全。The control loop of the PLC controller can be designed as shown in Figure 4 to realize the remote control function and data background upload, further improving the use effect of the grounding device, especially ensuring its safety.

虽然以上实施例已经参照附图对本实用新型目的的构思和实施例做了详细说明,但本领域普通技术人员可以认识到,在没有脱离权利要求限定范围的前提条件下,仍然可以对本实用新型作出各种改进和变换,故在此不一一赘述。Although the above embodiments have described in detail the concepts and embodiments of the present utility model with reference to the accompanying drawings, those of ordinary skill in the art can realize that the present utility model can still be modified without departing from the scope of the claims. There are various improvements and transformations, so I won’t go into details here.

Claims (3)

1. The utility model provides a grounding device suitable for special backward flow of urban rail transit which characterized in that: the device comprises a compound switch composed of a direct current contactor and an electric isolating switch, wherein the direct current contactor is connected with a negative electrode backflow rail and a grounding busbar to realize quick grounding, the electric isolating switch is connected in parallel with two ends of the direct current contactor and is positioned in a loop formed by the electric isolating switch, the negative electrode backflow rail and the grounding busbar, and the switching-on and switching-off state of the electric isolating switch and the switching-on and switching-off state of the direct current contactor are mutually follow-up.
2. The grounding device suitable for urban rail transit special backflow according to claim 1, characterized in that: the following of the on-off state of the electric isolating switch and the on-off state of the direct current contactor means that: when the direct current contactor is closed and the loop of the negative electrode reflux rail is short-circuited, the electric isolating switch is closed in a follow-up way; when the electric isolating switch is not grounded, the electric isolating switch is separated, and the direct current contactor is separated in a follow-up way.
3. The grounding device suitable for urban rail transit special backflow according to claim 1, characterized in that: the switching state of the direct current contactor and the electric isolating switch is controlled by a PLC controller.
CN202321127148.2U 2023-05-11 2023-05-11 Grounding device suitable for special reflux of urban rail transit Active CN219873231U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202321127148.2U CN219873231U (en) 2023-05-11 2023-05-11 Grounding device suitable for special reflux of urban rail transit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202321127148.2U CN219873231U (en) 2023-05-11 2023-05-11 Grounding device suitable for special reflux of urban rail transit

Publications (1)

Publication Number Publication Date
CN219873231U true CN219873231U (en) 2023-10-20

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