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  • 家用光伏电站接地规范
  • 本站编辑:杭州晨诺机械科技快乐飞艇发布日期:2019-02-26 13:52 浏览次数:
   光伏电站使用寿命长达25年以上,前提是设备质量及安装工艺规范,其中,接地是十分重要的一个步骤,接地不当会因设备对地绝缘阻抗过低或漏电流过大而报错,影响发电量,甚至还可能会危害人身安全。那么,光伏电站应该如何正确接地呢?
 
The service life of photovoltaic power plant is more than 25 years. The premise is the equipment quality and installation process specification. The grounding is a very important step. The improper grounding will cause errors due to the low insulation impedance or excessive leakage current of the equipment to the ground, affect the power generation, and even endanger personal safety. So, how should photovoltaic power plants be grounded correctly?
 
 
 
一、组件侧接地
 
I. Grounding at Component Side
 
 
 
1、组件边框接地
 
1. Grounding of Component Border
 
 
 
很多人认为组件与支架均为金属体,直接接触导通,只要做了支架的接地处理就不用再做组件的了。实际上组件铝边框与镀锌支架或铝合金支架都做了镀层处理,满足不了接地要求。而且组件存在着老化问题,可能产生漏电流过大或者对地绝缘阻抗过低问题,如果边框不接地,几年之后,逆变器很可能报相应的故障导致系统不能正常发电。
 
Many people think that the components and the brackets are metal bodies, which are directly contacted and connected. As long as the brackets are grounded, the components need not be made any more. In fact, the aluminium frame and galvanized bracket or aluminium alloy bracket have been coated to meet the grounding requirements. Moreover, there are aging problems in the components, which may result in excessive leakage current or low insulation impedance to the ground. If the frame is not grounded, in a few years, the inverters will probably report the corresponding faults, which will lead to the failure of the system to generate electricity normally.
 
 
2、组件支架接地
 
2. Grounding of Component Support
 
 
 
光伏组件的防雷接地电阻要求应小于10Ω,逆变器和配电箱接地电阻应小于4Ω。对于达不到接地电阻要求的,通常采用添加降阻剂或选择土壤率较低的地方埋入。
 
The lightning protection grounding resistance of photovoltaic modules should be less than 10, and the grounding resistance of inverters and distribution boxes should be less than 4. For those failing to meet the requirements of grounding resistance, resistance reducers are usually added or buried in places with low soil rate.
 
 
 
二、逆变器侧接地
 
II. Inverter Side Grounding
 
 
 
1.工作接地
 
1. Working Grounding
 
 
 
一般工作接地(PE端)接到配电箱里的PE排上,再通过配电箱做接地。
 
General working grounding (PE terminal) is connected to the PE row in the distribution box, and then grounded through the distribution box.
 
 
 
2.保护接地
 
2. Protective grounding
 
 
 
逆变器机身的右侧有一个接地孔是做重复接地,保护逆变器和操作人员的安全。
 
There is a grounding hole on the right side of the inverter fuselage to do repetitive grounding to protect the safety of the inverters and operators.
 
 
 
三、配电箱侧接地
 
3. Distribution box side grounding
 
 
 
1、防雷接地
 
1. Lightning Protection and Grounding
 
 
 
交流侧防雷保护一般由熔断器或断路器和防雷浪涌保护器构成,主要对感应雷电或直接雷或其他瞬时过压的电涌进行保护,SPD的下端接到配电箱的接地排上。
 
AC side lightning protection generally consists of fuse or circuit breaker and lightning surge protection device. It mainly protects induced lightning or direct lightning or other transient overvoltage surges. The lower end of SPD is connected to the grounding row of distribution box.
 
 
 
2、箱体接地
 
2. Box grounding
 
 
 
根据《建筑电气工程施工质量验收规范》6.1.1柜、屏、台、箱、盘的金属框架及基础型钢必须接地(PE)或接零(PEN)可靠;装有电器的可开启门,门和框架的接地端子间应用黄绿色铜线连接。
 
According to "Code for Acceptance and Acceptance of Construction Quality of Electrical Engineering in Buildings" 6.1.1, the metal frames of cabinets, screens, benches, boxes and pans and the basic section steel must be reliable in grounding (PE) or zero connection (PEN); the open doors equipped with electrical appliances shall be connected by brass green copper wire between the grounding terminals of doors and frames.
 
 
 
配电箱的柜门与柜体要做跨接线,保证可靠接地。
 
The cabinet door and cabinet body of the distribution box should be connected across to ensure reliable grounding.
 
 
 
光伏电站需从组件侧、逆变器侧、配电箱侧三个方面做好系统的接地,减少后期不必要的运维,以保障系统稳定安全高效的运行。
 
The grounding of photovoltaic power plant should be done well from three aspects: component side, inverter side and distribution box side, so as to reduce unnecessary operation and maintenance in the later period, so as to ensure the stable, safe and efficient operation of the system.
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