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低压配电柜元件的选择及安装

发布时间:2021-12-06 来源:http://www.tongyuhengcheng.com/ 浏览量:

低压配电柜内装的元件的电气参数应符合设备额定参数的要求。若元件的短路耐受强度或分断能力不足以承受安装场合可能出现的应力时,应利用限流保护器件(如熔断器或断路器)对元件进行保护。
The electrical parameters of the components installed in the low-voltage distribution cabinet shall meet the requirements of the rated parameters of the equipment. If the short-circuit withstand strength or breaking capacity of the element is insufficient to withstand the stress that may occur in the installation site, the element shall be protected by current limiting protection devices (such as fuse or circuit breaker).
安装在同一支架(安装板、安装框架)上的电器元件和外接导线端子的布置应使其在安装、接线、维修和更换时易于接近,尤其是外部接线端子应安装在装置基础面上方至少0.2m,并且端子的安装应使电缆易于与其连接。低压配电柜内由操作人员观察的指示仪表不应安装在高于设备基础面2m处。操作器件,如手柄、按钮等,应安装在易于操作的高度上,其中心线一般不应高于设备基础面2m。紧急操作器件应尽可能安装在距离地面0.8 - 1.6m的范围内。
The arrangement of electrical components and external conductor terminals installed on the same support (mounting plate and mounting frame) shall make them easy to access during installation, wiring, maintenance and replacement. In particular, the external wiring terminal shall be installed at least 0.2m above the basic surface of the device, and the terminal shall be installed so that the cable can be easily connected with it. The indicating instrument observed by the operator in the low-voltage distribution cabinet shall not be installed 2m higher than the equipment foundation surface. Operating devices, such as handles and buttons, shall be installed at a height easy to operate, and the center line shall generally not be 2m higher than the equipment foundation surface. Emergency operating devices shall be installed within 0.8 - 1.6m from the ground as far as possible.
电气成套
正常的温升、绝缘材料的老化和正常工作时所产生的振动不应造成载流部件的连接有异常变化,尤其应考虑到不同金属材料的热膨胀和电化学腐蚀作用以及实际温度对材料耐久性的影响。载流部件之间的连接应保证有足够的和持久的接触压力。
Normal temperature rise, aging of insulating materials and vibration during normal operation shall not cause abnormal changes in the connection of current carrying parts, especially considering the thermal expansion and electrochemical corrosion of different metal materials and the impact of actual temperature on material durability. The connection between current carrying parts shall ensure sufficient and lasting contact pressure.
低压配电柜中导体截面积的选择应考虑以下因素:承载电流、机械应力、导体敷设方法、绝缘 类型和所连接的元件种类。
The selection of conductor cross-sectional area in low-voltage distribution cabinet shall consider the following factors: bearing current, mechanical stress, conductor laying method, insulation type and type of connected components.
低压配电柜中的绝缘导线应不低于相应电路的额定绝缘电压。两个连接器件之间的电线不应有 中间接头或焊接点,应尽可能在固定的端子上进行接线。绝缘导线不应支靠在不同电位的裸露带电部件和带有尖角的边缘上,应釆用适当的方法固定绝缘。连接覆板或门上电器元件和测量仪器的导线,应该使覆板和门的移动不会对导线产生任何机械损伤。通常,一个端子上只能连接一根导线,将两根或多根导线连接到一个端子上时,只有在端子是为此用途而设计的情况下才允许。
The insulated conductor in the low-voltage distribution cabinet shall not be lower than the rated insulation voltage of the corresponding circuit. The wires between two connecting devices shall not have intermediate joints or welding points, and shall be wired on fixed terminals as far as possible. Insulated conductors shall not be supported on exposed live parts with different potentials and edges with sharp corners, and appropriate methods shall be used to fix the insulation. The conductor connecting the electrical components on the cladding or door and the measuring instrument shall ensure that the movement of the cladding and door will not cause any mechanical damage to the conductor. Usually, only one wire can be connected to a terminal. When two or more wires are connected to a terminal, it is allowed only if the terminal is designed for this purpose.
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