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高频信号3dB告警原因分析
引用本文:张杰,杨立滨,刘生春,丛贵斌,吴克胜,李春来.高频信号3dB告警原因分析[J].青海电力,2011(Z2):53-55.
作者姓名:张杰  杨立滨  刘生春  丛贵斌  吴克胜  李春来
作者单位:青海电力科学试验研究院;青海省电力公司超高压运行检修公司
摘    要:高频通道作为线路两端主保护装置联系的"纽带",能否正常传送高频信号,决定着高频保护的运行水平。当系统出现故障时,如果线路保护的高频信号不能正常传送,则会出现保护拒动或误动现象,影响系统安全稳定运行。文章介绍了高频保护载波通道及设备,通过收发电平理论计算,分析了收发信机3dB告警原因,经过实测解决了高频信号3dB告警问题。

关 键 词:高频保护  高频信号  高频通道  3dB告警

Reason Analysis of High-frequency Signal 3dB Alarm
ZHANG Jie,YANG li-bin,LIU Sheng-chun,CONG Gui-bin,WU Ke-sheng,LI Chun-lai.Reason Analysis of High-frequency Signal 3dB Alarm[J].Qinghai Electric Power,2011(Z2):53-55.
Authors:ZHANG Jie  YANG li-bin  LIU Sheng-chun  CONG Gui-bin  WU Ke-sheng  LI Chun-lai
Abstract:As connection between both side of transmission line’s main protection,whether the high-frequency channel normally operates and transmits high-frequency signal determines operating level of high-frequency protection.If the line protection signal can not be normally transmitted during the system fault,it will occur protection failure and malfunction,and will influence safe and stable operation.The paper introduces high-frequency protection channel and equipment,receive and transmit level calculation,an analyzes alarm reason of receive and transmit signal 3dB,as well as solves alarm problem of high-frequency signal 3dB through practical measurement.
Keywords:high-frequency protection  high-frequency signal  high-frequency channed  3dB alarm
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