无线剩余电流在线监测装置

通讯方式采用RS485有线/无线LoRa传输,下行数据采集方式0-5mA,能有效监测接地剩余电流数据,剩余电流测量范围10mA-8000mA,可自主设定预警值与报警值,且能实时上传剩余电流数据。

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Power IoT sensors Smart power distribution Internet of Things Smart cable tunnel gallery Smart power generation Internet of Things Smart Internet of Things

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Product Details

无线剩余电流在线监测装置

 

 

背景

 

 

    近年来,相关国标、行标及规程逐步细化变电站内动力电缆与控制电缆、通信电缆分沟、分层隔离要求,截至2019年5月,变电站电缆火灾隐患排查情况如下:

1、分沟整治:在运变电站39238座,440座变电站开展了,占比.12%。

2、分层整治:10355座变电站完成了分层隔离,占比26.39%。

国网冀北、江苏、重庆、福建4个公司分别选择了不同电压等级、不同设计时间、不同设备型式共21座220kV及以上变电站进行了低压交流断路器灵敏度校核试点。试点变电站交流电源系统中超过100米的主馈线电缆回路,记过校核统计:共校核回路1228条,按照1.3倍系数校核,不合格476条,不合格率38.8%,按照1.5倍系数校核,不合格609条,不合格率49.6%,总体情况不容乐观。

变电站低压交流电缆一旦发生漏电火灾事故,由于断路器灵敏度不足、动力与控制电缆混沟分布,容易使事故扩大化。因此针对目前在运站有必要采取监测措施,提升电缆消防治理能力。


 

系统架构图

 

 

    无线剩余电流在线监测装置在电缆两端分别加装剩余电流传感器,传感器采集数据通过lora无线通讯模块上送至站端智能在线监测IED,智能在线监测IED通过安全隔离装置实时上送至站端后台服务器,通过后台服务器的数据分析软件和智能诊断系统,电缆的余电流进行计算分析,给出变化曲线;当有关指标达到报警状态时(剩余电流大幅增长或下降),上传报警信息,实现各项数据的在线监测及实时告警。

 


 

系统组成

 


   1、低压交流系统电缆绝缘在线监测装置IED

   尺寸:315*239*56mm;含组态软件、数据采集、参数设置、通讯告警、分析诊断、WEB浏览、通信远传,上行通讯方式采用IEC61850,下行通讯方式采用RS485,大容量数据存储,带录波功能。


 

   2、剩余电流采集单元

   尺寸:72*88*72mm;上行通讯方式采用RS485有线传输,下行数据采集方式0-5mA,能有效监测接地剩余电流数据,剩余电流测量范围10mA-8000mA,可自主设定预警值与报警值,且能实时上传剩余电流数据。

   3、剩余电流传感器

   设备最高电压:0.66/0.72kV;

   测量范围:10mA~10A;

   测量精度:1%±1mA;

   工作温度:-25℃-50℃

  4、后台软件

   剩余电流总监控屏应能对对剩余电流的数据进行监测及对报警阈值进行设置,总监控屏具备以下特性:

   监测功能: 总剩余电流、馈线回路剩余电流、长电 缆等数据监测。

   诊断功能:具备装置自检功能。

   告警功能:可设置剩余电流越限报警,并能通过声光等方式进行告警。

   记录功能:大容量数据存储,1S/条数据记录频次能保存站内所有馈线剩余电流记录1年的数据内容。

   具有遥测、遥信功能;能采集并通过通信接口向上级监控单元发送漏电流采集量等。

   采集并通过通信接口向上级监控单元发送交流检测回路漏电流采集异常、监控装置故障、监控通信异常。

   装置可通过通信接口与上级监控进行连接通信,实现对系统的远程监控。

 

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