低压配电柜内避雷器为什么会接在一个回路,并且在断路器后面

有1块电压表和3块电流表的柜子,可能是总的出线柜,也可能是补偿柜,不知道你说的是那一个?
如是总的出线柜,电流表应该显示总的负载工作电流,为0 ,不是没用电,就是电流表的线路有问题.
如是补偿柜,电流表显示补偿电流的大小.为0 ,说明电容器没有投入工作（不需要补偿,或控制线路、电力线路有问题）.

一个圈打两个杠：是电流互感器.
你图上的虚线是双电源开关其中一路备用进线（只限此图）.
三角型向下就是进出线的引线,

This design is a constant force on Dalian petrochemical wastewater pre-treatment of the low-voltage power distribution, low-voltage power distribution cabinet design, the design focuses on the low-voltage power distribution in the low-voltage power distribution cabinet group and capabilities, the low-voltage power distribution cabinet 2 theory research, as well as the low-voltage power distribution cabinet, the link between the article also describes the electrical specifications and its principles, the low-voltage power distribution cabinet of 2 diagram for an in-depth study including switch low-voltage switch cabinet to line voltage switch cabinet, and the low-voltage switch cabinet, capacitor voltage switch cabinet, the motor low-voltage power distribution cabinet, and so on. Design and methods of the capacitor to compensate reactive power, in order to reduce power supply system of the power loss and voltage loss, while improving the quality of the supply voltage. It reflects the safe, reliable, flexible, and design of economic principles of electrical main terminal focuses on the importance of the electrical main terminal to the cable, the model would be able to sustain the flow, as well as the power cable and select the formula are described, as well as low-voltage power distribution cabinet power of electricity, etc.
It is well known that energy production is the main energy and power. The power delivery and distribution is simple and easy to control, regulate and measurement, and to automate the manufacturing process. Following electric power production in the system to ensure that important aspects of the electricity system, security, stability, reliability and economy are running an important role. Following the performance too, not only with the theory, design, etc. , but also closely related to its configuration and integration will be closely related. Power distribution network of electric power systems in the end, is a power supply of the final link directly to the power user, its safe to run level has a direct impact on the user's power quality. It should be based on the actual grid structure, parameters, and needs of the distribution network, and the following are optimized to improve the entire distribution network will be protected and the configuration, the switch cabinet in the supply and distribution system is an integral part of the delivery of power and run the entire grid has an important role. Therefore, the design described in detail in the low-voltage switch cabinet design principles and their capabilities.
Key word low-pressure low-voltage power distribution, power distribution cabinet without compensating Cable Select

电压转换开关嘛,用户可以随时利用它监测进线侧电压.

您是不是要找： 为什么低压配电柜有那么多柜子组成
搜索结果10/0.4kV变电所高压柜具体由哪种柜子组成,功能是什么?请以KYN28柜型 ...2010年3月9日 ... 热电站的高压配电柜用到了继电器,一个柜子上有时间继电器,电压继电器,有信号继电器. ... 高压电气柜中,为什么要把PT单独设一个柜子? 9 2008-11-5 ... 生产高压隔离操动机构,电器高低压开关柜产品强度高,无需检修,电接触可靠性高 ...
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PE排：用于专用接地,做接地保护用,平时（正常情况下）无电流通过.
N排：就相当于火线和零线中的零线作用.

柜内母线电器安装中,不同相的裸露载流部分之间及裸露载流部分与非绝缘的金属柜架之间的电气间隙应不小于20mm,如不能满足此要求,必须采取绝缘防护措施
见《高压开关柜、成套低压配电柜及动力开关柜安装》